GOST 6511-2014
GOST 6511−2014 Bars tin-zinc bronze. Specifications
GOST 6511−2014
INTERSTATE STANDARD
BARS AND RODS, TIN-ZINC BRONZE
Specifications
Wrought tin-zinc bronze rods. Specification
ISS 77.150.30
Date of introduction — 2015−09−01
Preface
Goals, basic principles and main procedure of works on interstate standardization have been established in GOST 1.0−92 «interstate standardization system. Basic provisions» and GOST 1.2−97 «interstate standardization system. Interstate standards, rules and recommendations on interstate standardization. Rules of development, adoption, application, renewal and cancellation».
Data on standard
1 DEVELOPED by the Technical Committee for standardization TC 106 «Tsvetmetprokat», Scientific — research, project and design Institute for alloys and processing of nonferrous metals «joint-stock company «Institute tsvetmetobrabotka» (JSC «Institute tsvetmetobrabotka»)
2 SUBMITTED by the Technical Secretariat of the Interstate Council for standardization, Metrology and certification
3 ACCEPTED by the Interstate Council for standardization, Metrology and certification (Protocol of November 14, 2014 N 72-N)
The adoption voted:
| Short name of the country on MK (ISO 3166) 004−97 | Country code MK (ISO 3166) 004−97 | Abbreviated name of the national authority for standardization |
| Armenia | AM |
Ministry Of Economy Of The Republic Of Armenia |
| Belarus | BY |
Gosstandart Of The Republic Of Belarus |
| Kyrgyzstan | KG |
Kyrgyzstandard |
| Russia | EN |
Rosstandart |
4 by Order of the Federal Agency for technical regulation and Metrology dated 26 November 2014 N 1829-St inter-state standard GOST 6511−2014 introduced as a national standard of the Russian Federation from September 1, 2015.
5 REPLACE GOST 6511−60
Information about the changes to this standard is published in the annual reference index «National standards», and the text changes and amendments — in monthly information index «National standards». In case of revision (replacement) or cancellation of this standard a notification will be published in the monthly information index «National standards». Relevant information, notification and lyrics are also posted in the information system of General use — on the official website of the Federal Agency for technical regulation and Metrology on the Internet
1 Scope
This standard applies to bars, drawn, round, square and hexahedral cross-sections and rods, extruded round section tin-zinc bronze, used in various industries.
The standard specifies the dimensions, technical requirements, acceptance rules, methods of control and testing, marking, packaging, transportation and storage of rods.
2 Normative references
This standard uses the regulatory references to the following international standards:
GOST 166−89 Calipers. Specifications
GOST 427−75 Rulers measuring metal. Specifications
GOST 1497−84 (ISO 6892−84) Metals. Test methods tensile
GOST 1953.1−79 Bronze tin. Methods for determination of copper
GOST 1953.2−79 Bronze tin. Methods for determination of lead
GOST 1953.3−79 Bronze tin. Methods for determination of tin
GOST 1953.4−79 Bronze tin. Methods for determination of phosphorus
GOST 1953.5−79 Bronze tin. Methods for determination of Nickel
GOST 1953.6−79 Bronze tin. Methods for determination of zinc
GOST 1953.7−79 Bronze tin. Methods of iron determination
GOST 1953.8−79 Bronze tin. Methods for determination of aluminium
GOST 1953.9−79 Bronze tin. Methods for determination of silicon
GOST 1953.10−79 Bronze tin. Methods for determination of antimony
GOST 1953.11−79 Bronze tin. Methods for determination of bismuth
GOST 1953.12−79 Bronze tin. Methods of determining sulphur
GOST 1953.13−79 Bronze tin. Method of determination of manganese
GOST 1953.14−79 Bronze tin. Method for determination of magnesium
GOST 1953.15−79 Bronze tin. Methods for determination of arsenic
GOST 1953.16−79 Bronze tin. Method of determining titanium
The Wire GOST 3282−74 General purpose low carbon steel. Specifications
GOST 3560−73 package steel Strip. Specifications
GOST 5017−2006 Bronze tin pressure treated. Brand
GOST 6507−90 Micrometers. Specifications
GOST 7502−98 metallic measuring tape. Specifications
GOST 14192−96 Marking of cargo
GOST 24047−80 Semi-finished products from nonferrous metals and their alloys. Sampling for tensile test
GOST 24231−80 non-ferrous metals and alloys. General requirements to selection and preparation of samples for chemical analysis
GOST 26877−2008 metal Products. Methods of measuring form deviations of
Note — When using this standard appropriate to test the effect of reference standards for the sign «National standards» drawn up as of January 1 of the current year and related information signs, published in the current year. If the reference standard is replaced (changed), when using this standard should be guided by replacing (amended) standard. If the reference standard is cancelled without replacement, then the situation in which the given link applies to the extent that does not affect this link.
3 Terms and definitions
This standard applies the following terms with respective definitions:
3.1 rod: a Solid product of uniform cross section throughout its length, in the form of a circle, square, regular polygons, supplied in straight lengths or rolled in the Bay.
3.2 Bay: the Cut products, rolled into a series of continuous turns.
3.3 measuring length: the Product of a certain length, specified in the order, straight leg, or in the Bay.
3.4 times the length: the Period of integral multiple of the number of core length with an allowance for cutting and a tolerance on the overall length.
3.5 captivity: defect of a surface, representing a delamination of the metal azkabanu forms, United with the base metal on one side.
3.6 dent: Local deepening of various sizes and shapes with sloping edges.
3.7 sink: indentation on the surface of the product from the chipping of impurities.
3.8 bullies: the Defect of the surface in the form of a wide longitudinal recess with an irregular bottom and the edges formed due to a sharp friction of individual sections of prefabricated about the details of rolling and finishing equipment.
3.9 koltsevatost: recurrent projections or recesses of the metal annular or spiral shape.
3.10 a crack: a Defect of a surface, representing a rupture of the metal.
3.11 stratification: the discontinuity of metal, oriented along the direction of deformation.
3.12 risk: the Defect of the surface of the semifinished product in the form of narrow longitudinal recesses with a rounded or flat bottom, formed as a result of scratching the metal surface protrusions on the surface of rolling and finishing equipment.
3.13 torsion: Deviation form, characterized by the rotation of the cross section relative to the longitudinal axis of the rod.
3.14 curvature: Deviation from straightness, in which not all of the point lying on the geometrical axis of the rod, equidistant from the horizontal or vertical plane.
3.15 cut end Squareness, mm: Deviation from perpendicularity at which the cutting plane forms with the longitudinal planes of metal angle other than 90°
3.16 the radius of curvature of the angle: the Amount of acceptable deviation from the shape of the corner.
3.17 press Utina: an Inconsistent extruded product in the form of delamination of the metal or leakage occurring at the end of the molded product adjacent to the press-residue, as a result of uneven flow of metal during compaction.
4 Assortment
4.1 nominal diameter drawn bar and limit deviations of the diameter must match the values specified in table 1.
Table 1 — nominal diameter drawn bar and limit deviations of the diameter
In millimeters
| The nominal diameter or distance between parallel faces of the rod | Tolerance on nominal diameter rods in a precision manufacturing | |||
| round |
square and hex | |||
| high | normal |
high | normal | |
| From 5.0 to 6.0 incl. | 0 -0,07 |
0 -0,16 |
0 -0,07 |
0 -0,16 |
| SV. 6.0−10.0 incl. | 0 -0,09 |
0 -0,20 |
0 -0,09 |
0 -0,20 |
| SV. Of 10.0 to 18.0 incl. | 0 -0,11 |
0 -0,24 |
0 -0,11 |
0 -0,24 |
| SV. 18.0 to 30.0 incl. | 0 -0,13 |
0 -0,28 |
0 -0,13 |
0 -0,28 |
| SV. Of 30.0 to 36.0 incl. | 0 -0,16 |
0 -0,34 |
0 -0,16 |
0 -0,34 |
| SV. 36,0 to 40,0 incl. | 0 -0,16 |
0 -0,34 |
- | - |
| Note — diameter For square and hexagonal bars take the diameter of the inscribed circle, i.e. the distance between parallel edges of the rod. | ||||
4.2 the nominal diameter extruded rods and limit deviations of the diameter must match the values specified in table 2.
Table 2 — nominal diameter extruded rods and limit deviations of the diameter
In millimeters
| Nominal diameter | Limit deviation of nominal diameter rods in a precision manufacturing |
| From. 42 to 50 incl. | 0 1.6 million |
| SV. 50 to 80 incl. | 0 -1,9 |
| SV. 80 to 120 incl. | 0 -2,2 |
4.3 Diameters, cross-sectional area and linear density of the drawn and extruded bars are given in Appendix A.
4.4 the length of the drawn bars are made random, and multiple dimensional measuring length in segments and in the bays.
In segments:
— random length:
from 1000 to 4000 mm — diameter 5−30 mm incl.;
«1000» 3000 «diameter over 30» 40 ««
Maximum deviations along the length of the rods of standard length or a multiple of gauging length within off-gage should not exceed 10 mm.
Allowed the production of rods with a length which is not specified in 4.4. The maximum deviation along the length, curvature, twisting, and surface quality set by agreement between the consumer and the manufacturer.
Rods lengths are made by agreement between the consumer and the manufacturer.
By agreement between the consumer and the manufacturer pulled the rods with a diameter less than 14 mm can be manufactured in coils, length of bars should be not less than 3 m.
4.6 Extruded bars manufactured length less than 500 mm.
The legend rods are placed according to the scheme:
| Rod | X | XX | X | … | … | Bros 4−3 | … | GOST 6511−2014 |
| A method of manufacturing | ||||||||
| Sectional shape | ||||||||
| Precision manufacturing | ||||||||
| Section dimensions | ||||||||
| Length | ||||||||
| Mark | ||||||||
| Special conditions | ||||||||
| The designation of this standard |
Use the following abbreviations:
| method of manufacture: | cold-deformed (drawn) — D, extruded — G; |
| sectional shape: |
round — CU, square — SQUARE, hex — CG; |
| precision manufacturing: | normal — N, increased — P, |
| length: |
random — ND, dimensional — CD; |
| special conditions: | for processing on machines at all. |
The sign «X» is placed instead of the data that has more than one value except to indicate the length and special conditions.
Examples of symbols of bars:
Rod round steel bars, hexagonal, normal precision manufacturing, with a diameter of 24 mm, length 3000 mm bronze brand Bros 4−3:
Rod DSGN 24x3000 GOST 6511−2014
The same, round steel bars, round, normal precision manufacturing, rigid, diameter 12 mm, random lengths, for processing on machines bronze brand Bros 4−3
Rod DCMH 12 ND Broz 4−3 AM GOST 6511−2014
The same, extruded, round, diameter 60 mm, random length bronze brand Bros 4−3
Rod HCRHH 60 ND Broz 4−3 GOST 6511−2014
The same, round steel bars, square, high precision manufacturing, with a diameter of 10 mm, random length, bronze brand Bros 4−3, in the bays are free of winding:
Rod DCVP 10 ND Broz 4−3 BT GOST 6511−2014
In the case where the user of special conditions not specified, the bars are made with performance conditions at the discretion of the manufacturer.
5 Technical requirements
5.1 Bars manufactured in accordance with the requirements of this standard for technological regulations approved in the prescribed manner.
5.2 Bars are made from bronze brand Bros 4−3 GOST 5017.
5.3 Surface bars should be free from contamination, hinder visual inspection, no cracks, delaminations, nicks, scratches and slag.
On the surface allowed individual slivers, dents, shells, scratches, scores and other defects, as well as koltsevatost, traces changes, if they control the sweep cannot make the bars for limit deviation for diameter.
5.4 In bars is not allowed for internal defects in the form of shells, non-metallic inclusions and press utain.
Broken off the end of the rod after removal of the press utiny the method of bend at the dispatch cut.
5.5 Upon the customer’s request bars should be trimmed evenly from both sides. The cut shall be perpendicular to the axis of the rod.
5.6 Unless specified by the consumer form the ends of bars 15 mm in diameter and less are allowed to cut, with cut end Squareness, mm is not regulated.
5.7 deviation from the cross-sectional shape may be within the tolerance on the diameter.
5.8 Square and hexagonal bars should not be visible to the naked eye twisting.
5.9 Bars must be straightened. The maximum curvature of the rods 1 m length should not exceed the values given in table 3.
Table 3 — Maximum curvature of bars
| A method of manufacturing of bars | The maximum curvature of a rod 1 m long rod with a nominal diameter or distance between parallel faces of a bar, mm | ||
| to 18 incl. |
over 18 to 40 incl. | over 40 | |
| Drawn |
2,0 | 2,0 | - |
| Drawn for processing on machines |
1,25 | 1,0 | - |
| Extruded |
- | - | 6,0 |
5.10 the Overall curvature of the rod should not exceed the values permissible curvature of 1 m for the total length of the rod in meters.
The curvature is not set:
for bars manufactured in coils.
5.11 Mechanical properties of bars shall conform to the requirements specified in table 4.
Table 4 — Mechanical properties of bars
| A method of manufacturing | The nominal diameter or distance between parallel faces mm | Temporary resistance |
Elongation after rupture, %, |
| Drawn | From 5 to 12 incl. |
430 (44) | 10 |
| SV. 12 up to 25 incl. |
370 (38) | 15 | |
| SV. 25 to 35 incl. |
330 (34) | 16 | |
| SV. 35 to 40 incl. |
310 (32) | 16 | |
| Extruded | From 42 to 120 incl. |
270 (28) | 25 |
At the request of the consumer drawn rods with diameter from 5 to 15 mm inclusive shall be tested for bending, and they must withstand the cold, without showing signs of strain, and without delaminations bend 90° around a mandrel with a radius of curvature equal to the diameter of the rod.
6 acceptance Rules
6.1 Bars take parties. The party must consist of bars of the same brand of alloy, one cross-sectional shape, one size, one method of manufacture, one state, one precision manufacturing. The party must be issued a document about quality that contains:
is the trademark or name and trademark of manufacturer;
— the name of the country of manufacture;
— legal address of the manufacturer and (or) the seller;
— the symbol bars;
— test results (as required);
— the batch number;
— the weight of the batch.
The weight of the batch shall be not more than 2000 kg.
Allowed to issue one document about quality for several batches of bars delivered simultaneously to the same consumer.
6.2 checking the dimensions and surface quality control of bars subjected to each bar of the party.
6.3 To check the curvature taken at least three bars or three bundles of 2000 kg or less.
6.4 tested for the absence of the press utiny at the end of the rod adjacent to the press-residue, is carried out on each heat treatment rod.
6.5 To check the fracture of bars drawn from the party taken two rods.
6.6 For tensile tests and bending taken away two bars from each batch.
6.7 To check the chemical composition of the selected two rods, two beams or the two bays of 2000 kg or less. Allowed the manufacturer checks the chemical composition carried out on the sample taken from the molten metal.
6.8 If unsatisfactory test results on at least one of performance, in addition to surface quality, it conducted a re-test of the doubled sample taken from the same batch.
The results of repeated tests spread to the entire party.
7 Methods of inspection and testing
7.1 the Inspection of the surface of bars produced without the use of magnifying devices.
7.2 Verification of dimensions is carried out on each selected 6.2 rod or Bay and 10% of bars in each beam.
7.3 Control of the diameters of the drawn bar is carried out with a micrometer according to GOST 6507, diameters of the extruded rods — a caliper according to GOST 166.
The bar length is measured by tape according to GOST 7502 or metal ruler according to GOST 427.
7.4 Torsion, the curvature, the cosine of the cut, the deviation from the cross-sectional shape of bars measured in accordance with GOST 26877.
Allowed to use other means of measurement and control, providing the required accuracy.
7.5 Check for internal defects and the absence of the press utiny in extruded bars is carried out at the end of the rod adjacent to the press-residue, non-destructive inspection method according to methodology described in Appendix B, or method of fracture. At the bend in the bars should not be press utiny, sinks, non-metallic inclusions. Kink in the delivery of bars not cropped.
Testing for the presence of shells and non-metallic inclusions is carried out according to the method of the manufacturer.
7.6 Check drawn bar in the presence of internal defects is carried out by fracture. The check is put both ends of the rod.
At the bend in the bars should not be press utain, sinks, non-metallic inclusions. Kink in the delivery of bars not cropped.
7.7 For checking metal in the presence of internal defects by breaking the bars must be notched with one or two sides.
7.8 the Incision should be made so that the fracture passed through the Central part of the rod.
The width of the fracture must be:
— not less than 60% diameter — for bars with diameter up to 16 mm, inclusive;
— not less than 10 mm, for bars with diameter over 16 mm.
Inspection of the fracture is carried out visually without the use of magnifying devices.
7.9 Sampling for tensile tests carried out according to GOST 24047.
Allowed for rods with cross-sectional area of 120 mmto produce samples with a diameter of 6,0; 8,0; 10,0 mm from the Central part of the rod.
The tensile test is carried out according to GOST 1497.
7.10 To test the chemical composition of the selected one sample from each selected on 6.7 rods or Bay and one sample from each selected beam. The selection and preparation of samples for chemical analysis is carried out according to GOST 24231.
Chemical composition of bars is determined according to GOST 1953.1 — GOST 1953.16 or other methods of equal accuracy standard.
If there is disagreement in assessing the quality of the chemical composition of bars is determined according to GOST 1953.1 — GOST 1953.16.
7.11 allowed the manufacturer to use other testing methods, providing the required accuracy set out in this standard.
7.12 the differences in assessing the quality of bars the consumer and the manufacturer are guided by the requirements established by this standard.
8 Marking, packaging, transportation and storage
8.1 each beam or the Bay must be attached to a metal, cardboard or plywood label, which indicate:
is the trademark or name and trademark of manufacturer;
— the name of the country of manufacture;
— the symbol bars;
— the batch number;
— the stamp of the technical control room or controller.
At the end of bars with a diameter greater than 40 mm should be embossed:
— grade or the symbol of the brand of alloy;
— the batch number;
— stamp of technical control.
8.2 Bars deliver without packaging.
8.3 Bars with a diameter from 5 up to 40 mm are tied in bunches or Bay weight not exceeding 80 kg each. Each bundle should consist of at least three bars and should be tied with wire in two turns with a diameter of 1.2 mm according to GOST 3282 in at least two places so as to exclude the mutual movement of the rods in the beam. The ends of the wire connected by twisting at least five turns. Each Bay needs to be tied up with a wire according to GOST 3282 in at least three places evenly around the circumference of the Bay.
Allowed a bunch of bundles with packing tape section of at least 0,3x30 churchyard 3560.
8.4 By agreement with the consumer allowed with mechanized loading and unloading, the mass of the beams and coves more than 80 kg.
8.5 Bars with a diameter up to 35 mm with a mass over 25 kg each and also bars with a diameter more than 35 mm in the beams don’t connect.
At the ends of bars with a diameter exceeding 35 mm and side bars with a diameter of less than 35, not bunched, should be marked with trademark of manufacturer and grade alloy.
For labeling of bars allowed to use the letter designation «BOTS"
8.6 At the request of the consumer drawn rods with diameter up to 10 mm inclusive and high manufacturing high precision associated in bundles or Bay, Packed in synthetic or non-woven materials according to the normative documents, ensure quality safety bars.
8.7 Bars transporterowych by all kinds of transport in covered vehicles in accordance with cargo carriage regulations applicable to transport of this species.
8.8 Transport marking under GOST 14192 with the application of additional labels batch numbers.
8.9 Bars should be stored indoors and protected from mechanical damage, moisture and active chemical substances.
9 manufacturer’s Warranty
9.1 the Manufacturer guarantees the conformity of bars present standard requirements provided the customer observes the conditions of transportation and storage.
Annex a (informative). Diameters, cross-sectional area and linear density of the drawn and extruded bars
Appendix A
(reference)
Table A. 1
| Nominal diameter, mm | The cross-sectional area of bars, mm |
Theoretical weight of 1 m of bars, kg | ||||
| round | square | hex | round | square | Seligman- tion | |
| 5,0 |
19,6 | 25,0 | 21,7 | 0,17 | 0,21 | 0,18 |
| 5,5 |
23,8 | 30,3 | 26,2 | 0,20 | 0,26 | 0,22 |
| 6,0 |
28,3 | 36,0 | 31,2 | 0,24 | 0,31 | 0,27 |
| 6,5 |
33,2 | 42,3 | 36,6 | 0,28 | 0,36 | 0,31 |
| 7,0 |
38,5 | 49,0 | 42,4 | 0,33 | 0,42 | 0,36 |
| 7,5 |
44,2 | 56,2 | 48,7 | 0,38 | 0,48 | 0,42 |
| 8,0 |
50,3 | 64,0 | 55,4 | 0,43 | 0,54 | 0,47 |
| 8,5 |
56,7 | 72,2 | 62.6 per | 0,48 | 0,61 | 0,53 |
| 9,0 |
63,6 | 81,0 | 70,2 | 0,54 | 0,69 | 0,60 |
| 9,5 |
70,9 | 90,2 | The 78.2 | 0,60 | 0,77 | 0,66 |
| 10,0 |
78,5 | 100,0 | 86,6 | 0,67 | 0,85 | 0,74 |
| 11,0 |
95,0 | 121,0 | 104,8 | 0,81 | 1,03 | 0,89 |
| 12,0 |
113,1 | 144.0 dt | To 124.7 | 0,96 | 1,22 | 1,06 |
| 13,0 |
132,7 | 169,0 | Of 145, 4 | 1,13 | 1,44 | 1,26 |
| 14,0 |
153,9 | 196,0 | 169,7 | Of 1.31 | 1,67 | 1,44 |
| 15,0 |
176,7 | 225,0 | 194,9 | 1,50 | Of 1.91 | 1,66 |
| 16,0 |
201,1 | 256,0 | 221,7 | 1,71 | 2,18 | Of 1.88 |
| 17,0 |
U.S. $ 227.0 | 289,0 | 250,3 | 1,93 | 2,46 | 2,13 |
| 18,0 |
254,5 | 324,0 | 280,6 | Of 2.16 | 2,75 | 2,39 |
| 19,0 |
283,5 | 361,0 | 312,6 | 2,41 | 3,07 | Of 2.66 |
| 20,0 |
314,2 | 400,0 | 346,4 | 2,67 | 3,40 | 2,94 |
| 21,0 |
346,4 | 441,0 | 381,9 | 2,94 | 3,75 | 3,25 |
| 22,0 |
380,1 | 484,0 | 419,1 | 3,23 | 4,11 | 3,56 |
| 23,0 |
Of 415.3 | 529,0 | 458,1 | 3,53 | 4,50 | 3,89 |
| 24,0 |
452,4 | 576,0 | 498,8 | 3,85 | 4,90 | 4,24 |
| 25,0 |
490,9 | 625,0 | 541,3 | 4,17 | 5,31 | 4,60 |
| 26,0 |
530,9 | 676,0 | 585,5 | Of 4.51 | 5,75 | 4,98 |
| 27,0 |
572,6 | 729,0 | 631,0 | 4,87 | 6,20 | 5,36 |
| 28,0 |
615,8 | 784,0 | 679,0 | Of 5.23 | Of 6.66 | 5,77 |
| 29,0 |
660,5 | 900,0 | 779,0 | Of 5.23 | Of 6.66 | 5,77 |
| 30,0 |
706,9 | 900,0 | 779,0 | 6,01 | 7,65 | 6,62 |
| 32,0 |
804,2 | 1024,0 | 887,0 | 6,84 | 8,70 | 7,54 |
| 35,0 |
962,1 | 1225,0 | 1060,9 | 8 and 18 | Of 10.41 | Of 9.02 |
| 36,0 |
1017,9 | 1296,0 | 1122,0 | 8,65 | 11,02 | Of 9.54 |
| 38,0 |
1134,1 | 1444,0 | 1250,5 | 9,64 | 12,27 | 10,63 |
| 40,0 |
1256,6 | 1600,0 | 1385,7 | 10,68 | 13,60 | 11,78 |
Note — When calculating the theoretical mass density of bronze is equal to 8.8 g/cm | ||||||
Appendix B (mandatory). Ultrasonic testing of press utain
Appendix B
(required)
The technique is intended for ultrasonic inspection to detect and determine where the end of the press utiny in extruded bars and rods of non-ferrous metals and alloys with a diameter of 10 mm and more with the help of ultrasonic flaw detection means in the contact mode of entering of ultrasonic vibrations from the cylindrical surface of the product.
B. 1 Equipment and standard samples
B. 1.1 is used To control: devices to scan with the built dual, or direct combined transducers of ultrasonic testing; ultrasonic testing-flaw detector, standard samples; assistive devices and adaptations to ensure constant control parameters (insertion angle of the acoustic contact, the scan step).
B. 1.2 may be applied to any ultrasonic flaw detector in conjunction with sensors that provide sufficient sensitivity, the value of which is set by the setting according to the standard model.
B. 1.3 the Standard model for sensitivity setting of ultrasonic equipment during the inspection, is made of a piece of defect-free rod with a length of 300 mm with a diameter of 100; 60; 40; 25 mm, made of the same material as a controlled rod or material with similar acoustic properties and having the same surface quality, and a controlled rod.
Figure B. 1. Standard sample to adjust the sensitivity of the apparatus when the control rods
Figure B. 1
B. 1.4 Standard sample to adjust the sensitivity of the apparatus when the control rods must conform to figure B. 1. Diameter of workpiece for standard sample is selected depending on the diameter of the rod controlled in accordance with table B. 1
| Table B1 |
In millimeters |
| The rod diameter of the test piece |
The controlled diameter of the rod |
| 100 |
120−80 |
| 60 |
80−50 |
| 40 |
50−30 |
| 25 |
30−10 |
B. 1.5 Plot of the products from which is made the standard sample, must not have internal defects of a metallurgical origin that could be detected by ultrasonic method when setting up the detector at the highest real sensitivity.
B. 1.6 As the outer surface of the standard sample should not be worse than controlled products.
B. 1.7 Standard sample must have a certificate approved by the Director.
B. 2 Preparing to monitor
B. 2.1 Before the control rods must be cleaned from dirt, dust, oils and other contaminants.
B. 2.2 the Inclusion of the instrument in the network and it is carried out in accordance with technical description and manual of the instrument used to control.
B. 3 control
B. 3.1 quality Control of the continuity of the metal bars based on the use of pulse echo method.
B. 3.2 Enter the ultrasonic waves in the metal rod is carried out by contact method.
B. 3.3 metal Control rod on the absence of defects is accomplished by scanning the surface of the controlled rod of the ultrasonic beam. Control place must be comfortable and allow free access around the circumference to a manageable end of the rod.
B. 3.4 Monitoring is carried out starting from the rear end of the extruded rod. The temperature of the controlled rod should be no higher than 40 °C.
B. 3.5 When monitoring should take into account that the press Utina bars has an elongated shape and different orientation of reflecting surfaces relative to the generatrix and are often located close to the end of the rod, so the detection of it with various parts of the surface may be different.
B. 3.6 For mechanized scanning of the sensor over the surface of the controlled rod is recommended to use a roller, prismatic or other devices with built-in ultrasonic sensors.
B. 3.7 Bars with a diameter less than 60 mm control on the ultrasonic frequency of 5 MHz, and bars and rods with diameter more than 60 mm in the ultrasonic frequency of 2.5 MHz. When determining the end of the press utiny bars of a material having an elastic anisotropy with a coarse-grained structure, it is recommended to use lower frequencies.
B. 3.8 During the inspection, the scanner is mounted on the controlled end of the rod and firmly presses the transducer against the surface, while on the flaw detector screen should appear backwall echo signal. With the advent of the backwall echo signal moving the scanning device around and along the rod.
B. 3.9 the scanning Speed of the sensor along the surface of the rod is selected from the conditions for obtaining reliable acoustic contact, it should not exceed 0.5 m/s in automated devices and 0.15 m/s during manual scanning.
B. 3.10 the Correct setting of flaw detection equipment checked at least once during the 2 h operation of the instrument with a standard sample.
B. 3.11 moving the sensor along and around the rod it is necessary to watch the screen of the flaw detector for the presence of acoustic contact. Stable bottom echo indicates a satisfactory entry of ultrasonic testing in bars. If sensor is working and properly configured equipment, the echo signal disappears, then test the reliability of the acoustic coupling by increasing the supply of contact fluid and wiping with rags the surface of the rod.
B. 3.12 After the detection of the press utiny sensor is moved along the rod to determine the length of the press utiny and where it ends. In the area where there is a complete disappearance of the additional echo signal to the left of bottom reflections, by rotating the device to scan around the bar make sure at the end of the press utiny around the entire circumference of the rod.
B. 3.13 by using ultrasound the exact location of the end of the press utiny, applied to the product good visible mark around the circumference of the rod for cutting.
B. 3.14 Under the control of alloys with elastic-heterogeneous coarse-grained structure, it is necessary to carefully control the rear end of the rod where the structural disturbance below the bottom echo-signal stable. On the background of unstable structural interference notice on the screen of the flaw detector the location of the echo from the press utiny. Moving the scanning device along the rod, continuously observe the echo from the press utiny, which, in contrast to structural interference, stable.
B. 4 Evaluation of results
B. 4.1 Assessment of the continuity of the metal bars is carried out according to the results of the analysis.
B. 4.2 About the presence of the press utiny judged by the appearance of additional echo to the left of the bottom reflection.
B. 4.3 About the end of the press utiny evidenced by the disappearance of the additional echo signal to the left of the bottom reflection.
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UDC 669.6'5−422:006.354 ISS 77.150.30
Keywords: bars and rods, tin-zinc bronze, nominal diameter, grade, chemical composition, curvature, mechanical properties
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The electronic text of the document
prepared by JSC «Code» and checked by:
the official publication of the
M.: STANDARTINFORM, 2015
