GOST R 56030-2014
GOST R 56030−2014 Pipe for the bearing components. Specifications
GOST R 56030−2014
Group В62
NATIONAL STANDARD OF THE RUSSIAN FEDERATION
PIPES FOR BEARINGS PARTS
Specifications
Pipes for details of bearings. Technical specifications
OKS 23.040.10
OKP 13 1400
13 4200
Date of introduction 2015−01−01
Preface
1 DEVELOPED by the Technical Committee for standardization TC 357 «Steel and cast iron pipes and cylinders» and Open joint stock company «Russian scientific research Institute of pipe industry» (JSC «RosNITI»)
2 SUBMITTED by the Technical Committee for standardization TC 357 «Steel and cast iron pipes and cylinders"
3 APPROVED AND put INTO EFFECT by the Federal Agency for technical regulation and Metrology dated «29» may 2014 N 482-St
4 INTRODUCED FOR THE FIRST TIME
Application rules of this standard are established in GOST R 1.0−2012 (section 8). Information about the changes to this standard is published in the annual (as of January 1 of the current year) reference index «National standards» and the official 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 a future issue of 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 (gost.ru)
Introduction
This standard is developed on the basis of interstate standard GOST 800 taking into account the national experience of the manufacture and use of tubes for bearing components.
While this standard has a number of differences:
— to expand the assortment of hot-deformed pipes from 53 to 219 mm, instead of the standard 800 from 70 to 204 mm;
— by agreement between manufacturer and customer, it is possible to manufacture pipes of other sizes and steel grades
— provides for the manufacture of pipes with high requirements.
a) for the manufacture of tubes for parts only used rolled and forged billets;
b) tightened the requirement for the depth of the imperfections on the outer surface of the pipe;
C) stricter requirements for the impurity metal pipes, non-metallic inclusions.
1 Scope
This standard applies to seamless hot deformed tubes of steel grades SHKH15, SHKH15-sh, SHKH15SG, SHKH15SG-sh, SHKH15, SHKH15SG-and cold-from steel grades SHKH15, SHKH15-sh, SHKH15-for the manufacture of bearing components.
2 Normative references
This standard uses the regulatory references to the following standards:
GOST 801−78 Steel bearing. Brand
GOST 1763−68 Steel. Methods for determining the depth bezoperatsionnogo layer
GOST 6507−90 Micrometers. Specifications
GOST 7502−98 metallic measuring tape. Specifications
GOST 8026−92 Line calibration. Specifications
GOST 9012−59 (ISO 410−82, ISO 6506−81) Metals. Method of measuring hardness Brinell hardness
GOST 10243−75 Steel. Test methods and evaluation of the macrostructure
GOST 10692−80 Pipe steel, cast iron and fittings to them. Acceptance, marking, packing, transportation and storage
GOST 12344−2003 Steel alloyed and high alloy. Methods for determination of carbon
GOST 12345−2001 (ISO 671−82, ISO 4935−89) Steel alloyed and high alloy. Methods of determining sulphur
GOST 12346−78 (ISO 439−82, ISO 4829−1-86) Steel alloyed and high alloy. Methods for determination of silicon
GOST 12347−77 Steel alloyed and high alloy. Methods for determination of phosphorus
GOST 12348−78 (ISO 629−82) Steel alloyed and high alloy. Methods for determination of manganese
GOST 12349−83 Steel alloyed and high alloy. Methods for determination of tungsten
GOST 12350−78 Steel alloyed and high alloy. Methods for determination of chromium
GOST 12351−2003 (ISO 4942:1988, ISO 9647:1989) Steel alloyed and high alloy. Methods for determination of vanadium
GOST 12352−81 Steel alloyed and high alloy. Methods for determination of Nickel
GOST 12353−78 Steel alloyed and high alloy. Methods for determination of cobalt
GOST 12354−81 Steel alloyed and high alloy. Methods for determination of molybdenum
GOST 12355−78 Steel alloyed and high alloy. Methods for determination of copper
GOST 12356−81 Steel alloyed and high alloy. Methods for determination of titanium
GOST 12357−84 Steel alloyed and high alloy. Methods for determination of aluminium
GOST 12358−2002 Steel alloyed and high alloy. Methods for determination of arsenic
GOST 12359−99 (ISO 4945−77) Steels carbon, alloyed and high alloy. Methods for determination of nitrogen
GOST 12360−82 Steel alloyed and high alloy. Methods of boron determination
GOST 12364−84 Steel alloyed and high alloy. Methods for the determination of cerium
GOST 12365−84 Steel alloyed and high alloy. Methods for determination of zirconium
GOST 17410−78 nondestructive testing. The seamless cylindrical metal pipe. Methods of ultrasonic flaw detection
GOST 18360−93 Gauges-bracket sheet for diameters from 3 to 260 mm. Dimensions
GOST 18365−93 Gauges bracket sheet with changeable lips for diameters over 100 to 360 mm. Dimensions
GOST 26877−91 metal Products. Methods of measuring form deviations of
GOST 28548−90 of steel Pipe. Terms and definitions
ISO 10893−2* Automatic eddy current testing of seamless and welded steel pipes (excluding pipes, made by arc welding under flux) for the detection of imperfections
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* Access to international and foreign documents referred to here and hereinafter, can be obtained by clicking on the link to the site shop.cntd.ru. — Note the manufacturer’s database.
Note — When using this standard appropriate to test the effect of reference standards in the information system of General use — on the official website of the Federal Agency for technical regulation and Metrology on the Internet or in the annual information index «National standards» published as on January 1 of the current year, and the editions of the monthly information index «National standards» for the current year. If replaced with a reference standard, which was given an undated reference, then it is recommended to use the current version of this standard, taking into account all enabled in this version modifications. If replaced with a reference standard, which is given a dated reference, it is recommended to use the version of this standard referred to above by year of approval (acceptance). If after approval of this standard in the reference standard, which is given a dated reference, a change affecting a provision to which reference, the provision is recommended to be applied without taking into account this change. If the reference standard is cancelled without replacement, the position in which reference is made to him, recommended to be used in part not affecting this link.
3 Terms and definitions
This standard applies the terminology according to GOST 28548, GOST 26877, as well as the terms according to [1] in respect of the surface defects.
4 Symbols and abbreviations
In this standard the following notation and abbreviations:
D — outer diameter;
S — wall thickness.
5 Assortment
5.1 Types of pipes and delivery condition
Tubes manufactures seamless hot-deformed (machined on the outer surface) or cold.
Pipe is supplied in heat treated condition.
According to customer’s requirement cold drawn tubes can be supplied after the low temperature leave.
5.2 steel grades
Pipes made from steel grades according to GOST 801 (section 1).
By agreement between the manufacturer and the customer pipes can be made of other steel grades.
5.3 Dimensions
Hot-deformed pipes are manufactured with outer diameters of 53.0 to 219,0 mm; a ratio of the diameter to wall thickness D/S in the range 3.5 to 17.0 m with an internal diameter of 33,0 mm.
Cold-rolled tubes are made with outer diameters up to 20,0 90,0 mm.
By agreement between the manufacturer and the customer the tubes can be made by another outer diameter.
5.4 Length
The pipes made of random length:
a) hot — in the range from 2000 to 5000 mm;
b) cold — in the range of 2,500 to 4,500 mm.
At the customer’s request pipes are made of standard length within off-gage.
Allowed shortened pipe length less than 1000 mm not more than 10% of the mass of the party.
By agreement between the manufacturer and the customer is allowed to put pipes with length different from specified above.
5.5 Examples of callouts
The legend of the tubes formed in accordance with the following examples.
Examples
1 cold-drawn Pipe outer diameter of 54.0 mm, a wall thickness of 5.5 mm of steel electroslag remelting brand SHKH15-sh:
Tube-X-54,0х5,5-SHKH15 — sh-GOST R —
2 hot-deformed Pipes of an external diameter of 102 mm, a wall thickness of 11.8 mm, a measuring length of 3500 mm of steel grade SHKH15:
Pipe-G-102,0х11,8х3500-SHKH15 — GOST R —
5.6 the Information provided in the order
5.6.1 When ordering the customer must specify the following required information:
1) designation of this standard;
2) pipes: hot-or cold — (n.5.1);
3) grade of steel (n.5.2);
4) outer diameter and wall thickness of pipes (clause 5.3);
5) length of tubes (n.5.4).
5.6.2 If necessary, the customer may specify in the order the following additional requirements:
1) manufacture of tubes from other steel grades (n.5.2);
2) fabrication of pipes: more than 5,000 mm hot-deformed, cold-drawn more than 4,500 mm (p. 5.4);
3) the manufacture of cold-deformed tubes after low-temperature release (p. 6.5.3);
4) for steel grades SHKH15-sh and SHKH15SG-W carbide liquation — 1 score (p. 6.6.3);
5) delivery of pipes with conservation coating (p. 6.8.3);
6) limitation of waviness of the surface (p. 6.4.4);
7) testing eddy current method (n.9.11).
5.6.3 If necessary between the manufacturer and the customer may be agreed upon the following provisions:
1) manufacturer of pipe sizes not specified in this standard (clause 5.3);
2) limit deviation of the outer diameter and wall thickness of pipes is not covered by this standard (clause 6.3.1);
3) testing non-destructive method (p. 6.6.10);
4) control the availability of longitudinal defects by nondestructive methods, the size of artificial defect in the reference sample;
5) applying additional marking on the pipe (p. 6.8.2);
6) delivery of pipes with safety fittings on the ends (p. 6.8.3)
7) special packing tubes (p. 6.8.4);
8) the legend of other grades of steel (clause 6.8.1);
9) parties are allowed in pipes of different heats (p. 8.2).
10) limit deviation of the wall thickness of hot pipes when the ratio D/S>11 (p. 6.3.1);
11) in the manufacture of tubes from other steel grades the necessary harmonization of hardness (p. 6.5.4) evaluation of the microstructure (p. 6.6.2) and contamination of the metal pipes, non-metallic inclusions (p. 6.6.4).
6 Technical requirements
6.1 Method of production
6.1.1 Hot-deformed pipes are manufactured by hot deformation method from forged or rolled billets. Cold-deformed pipes made by hot deformation and subsequent cold deformation.
6.1.2 the Pipe is subjected to heat treatment.
Heat treatment regime chosen by the manufacturer subject to the requirements of this standard.
According to customer’s requirement cold drawn tubes supplied with the conduct of a low temperature vacation.
6.1.3 Hot tubes are made with a machined outer surface.
6.2 Chemical composition
The chemical composition of the metal pipes of steel grades SHKH15, SHKH15SG, SHKH15-sh, SHKH15SG-sh, SHKH15-IN and SHKH15SG must correspond to GOST 801.
Metal pipes of steel grade SHKH15SG-sh, manufactured from a tube blank with a size of 140 mm and more, should have a manganese content from 1.00 to 1.20%, silicon from 0.45 to 0.65%, chromium, from 1.40 to 1.65%. Point heterogeneity in the metal of the initial billet pipes of steel grades SHKH15, SHKH15SG, SHKH15-IN and SHKH15SG-IN should not be more than 2.0 points in the scale N 2 10243 churchyard.
By agreement between manufacturer and customer can be established other requirements for the chemical composition of the steel.
In the manufacture of pipes of steel grades, not specified in this standard, the chemical composition of these steels must be agreed between manufacturer and customer.
6.3 Limit deviations of dimensions and shape
6.3.1 maximum rejections of sizes of pipes shall not exceed that specified in tables 1 and 2.
Table 1 — Limit deviation of the outer diameter
In millimeters
| The outer diameter D |
Limit deviations |
| Hot |
+0,2 |
| Cold: | |
| 60.0 incl. |
+0,4 |
| SV. 60,0 to 90,0 incl. |
+0,5 |
| SV. 90,0 |
By agreement between manufacturer and customer |
Table 2 — Limit deviations in wall thickness
| Wall thickness |
Limit deviation, % |
| Hot: | |
with respect to D/S |
+15 |
| with the ratio D/S>11 |
By agreement between manufacturer and customer |
| Cold |
+12 |
By agreement between the manufacturer and the customer permitted limit deviation of the outer diameter and/or wall thickness not covered by this standard.
6.3.2 Limit deviation of length of the measuring tubes should not exceed +10 mm pipes length up to 6000 mm inclusive and ± 15 mm for the pipes length more than 6000 mm.
6.3.3 Deviation from straightness of tubes should not exceed 1 mm on length of 1000 mm.
6.3.4 Ovality on the outer profile of the cold-deformed tubes should not exceed 0.8, the maximum deviations of the outer diameter.
6.4 surface Quality
6.4.1 On the surface of the pipe are not allowed cracks, slivers, and sunsets.
Allowed surface imperfections, not deducing the outer diameter and wall thickness for valid minimum value.
6.4.2 the machined surfaces hot pipes are not permitted areas of raw surface.
6.4.3 the roughness Parameter Rmachined surfaces should be no more than 80 microns.
By agreement between the manufacturer and the customer is allowed to produce pipes with more stringent requirements for surface roughness.
6.4.4 Waviness of the outer surface of the cold pipes should not exceed 0.3 mm for a length of 300 mm.
By agreement between the manufacturer and the customer waviness outer surface of the pipe shall not exceed 0.2 mm for a length of 300 mm.
6.5 Hardness
6.5.1 Hardness of hot-deformed pipes of steel grades SHKH15, SHKH15-sh, SHKH15-IN must be in the range from 207 to 187 HB (indentation diameter from 4.2 to 4.4 mm) of steel grades SHKH15SG, SHKH15SG-sh and SHKH15SG IN the interval from 217 to 197 HB (indentation diameter 4.1 to 4.3 mm).
6.5.2 Hardness, cold-worked or heat treated tubes should be in the range from 255 to 207 HB (indentation diameter 3.8 to 4.2 mm).
6.5.3 Hardness cold-deformed tubes supplied after the low temperature leave, shall be not more than 320 HB (indentation diameter less than 3.4 mm)
6.5.4 In the supply pipes from steel grades that are not specified in this standard, the hardness must be agreed between manufacturer and customer.
6.6 the Structure of the metal
6.6.1 In macrostructure transverse protravnogo investigated template are not allowed cracks, shrinkage looseness, bubbles, burnout, flocs, delamination, and foreign inclusions, visible without magnification.
By agreement between manufacturer and customer in the macrostructure of the investigated template protravnogo transverse pipe are not allowed cracks, shrinkage looseness, bubbles, burnout, flocs, delamination, and foreign inclusions that are visible with the use of magnification up to x 4 fold*.
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* The text of the document matches the original. — Note the manufacturer’s database.
Point the inhomogeneity of the macrostructure of pipes of steel grades SHKH15-sh and SHKH15SG-sh should be no more than 2.5 points in Appendix B of this standard.
6.6.2 the Microstructure of the pipe should consist of fine-grained pearlite with uniformly distributed carbides.
In the evaluation of the microstructure valid points 1A (Annex A), 1, 2, 3 churchyard 801 (scale No. 8) — for steel grades SHKH15, SHKH15, SHKH15-III and IN points 1, 2, 3, 5 GOST 801 (scale No. 8) — for steel grades SHKH15SG, SHKH15SG-sh and SHKH15SG-V.
In the supply pipes from steel grades that are not specified in this standard, the allowable points, in the assessment of microstructure should be agreed between manufacturer and customer.
The remains of a carbide mesh are not allowed above the 3-rd points according to GOST 801 (N scale 4).
6.6.3 Carbide liquation in metal pipes of all grades of steel must not exceed 1.5 points according to GOST 801 (scale No. 6).
According to customer’s requirement carbide liquation in the metal tubes of steel grades SHKH15-sh and SHKH15SG-W shall not exceed 1 point according to GOST 801 (scale No. 6).
6.6.4 Contamination of the metal pipes, non-metallic inclusions shall not exceed the limits specified in table 3.
Table 3 — Contamination of metal non-metallic inclusions
| Steel grade |
Score according to GOST 801 (scale N 1, 2, 3), not more | ||
| Oxides |
Sulfides | Globules | |
| SHKH15, SHKH15SG, SHKH15, SHKH15SG- |
2,5 | 2,5 | 2,5 |
| SHKH15-SH, SHKH15SG-SH |
1,5 | 1,5 | 1,5 |
| Note — For grades of steel that are not specified in this standard, the contamination of metal non-metallic inclusions should be agreed between manufacturer and customer. | |||
Allowed on one of the samples exceeded the established norms of 0.5 points according to one of the types of inclusions: oxides, sulphides or globular.
6.6.5 Pollution metal pipe silicate inclusions should not exceed the norms established for oxides and sulphides.
6.6.6 According to the agreement between the manufacturer and the customer is allowed to produce pipes with more stringent requirements for impurity metal.
6.6.7 Microporosity structure shall not exceed GPA of 2.0 according to GOST 801 (scale 7). Microporosity structure of the metal pipes of steel grades SHKH15-sh and SHKH15SG-sh is not allowed.
6.6.8 On the outer surface of the hot pipes is not allowed decarburization of the inner surface of the depth bezoperatsionnogo layers (the ferrite plus the transition zone) should not exceed 0.5 mm.
6.6.9 On the outer and inner surfaces of the cold-deformed tubes depth bezoperatsionnogo layers (the ferrite plus the transition zone) must not exceed 0,3 mm.
6.6.10 At the customer’s request pipes are subject to control:
— continuity of a non-destructive method;
for longitudinal flaws on the surface of the tubes non-destructive method.
6.7 Finish of pipe ends
The pipe ends should be square-cut and cleaned of burrs. Allowed the formation of a chamfer of a width not exceeding 3.0 mm.
6.8 Marking, packaging, transportation and storage
6.8.1 General requirements for marking, packaging, transportation and storage of pipes should correspond to GOST 10692 with the following additions.
6.8.1.1 At one end (at a distance from the end of not more than 500 mm) or at one of the ends of each pipe shall be marked with the melting number (on customer demand) and the symbol of the brand were:
X — for the grade SHKH15;
Sh — for the grade SHKH15-sh;
Mr. for the brand SHKH15SG;
GS — for the brand SHKH15SG-sh;
In — for the grade SHKH15.
GW — for the brand SHKH15SG-V.
The legend on other grades should be agreed between manufacturer and customer.
By agreement between manufacturer and customer on the pipe can be marked with additional markings.
6.8.1.2 At the request of the customer supply pipe with a temporary preservative coating
6.8.2 agreed between the manufacturer and customer ends of each pipe shall be closed with safety items (plugs, stoppers, caps).
6.8.3 by agreement between the manufacturer and the customer can be made special packing tubes.
7 safety Requirements and environmental protection
Pipes, safety parts, preservative coatings and materials must be fireproof, explosion-proof, elektrobezopasen, nontoxic, do not present a radiation hazard and do not provide harm to the environment and human health during test, storage, transportation, operation and disposal.
8 Rules of acceptance
8.1 Pipe take parties. The party should consist of pipes of the same diameter and wall thickness, one bottoms, one mode of heat treatment (for one of the charge pipes, processed in chamber furnaces) and be accompanied by one document on quality, which should include:
1) trademark or name or trademark and the name of the manufacturer;
2) the name of the Contracting authority;
3) the order number;
4) the date of the statement of quality document;
5) designation of the standard or normative and technical documentation;
6) size of tubes;
7) the steel grade;
8) number of trunks (in float);
9) batch number;
10) chemical composition of pipes (according to customer’s requirement);
11) the weight of the batch;
12) the total length of the pipes and, on demand, the number of tubes in pieces;
13) the results of all tests;
14) mark on the shipment of pipes of different sizes, if so specified in the normative-technical documentation;
15) stamp of technical control;
16) the name of the manufacturer of the workpiece;
17) chemical composition of steel in accordance with the document on the quality of billets.
8.2 by agreement between the manufacturer and the customer in the party are allowed tubes from different heats.
8.3 To check the conformity of the pipes with the requirements of this standard, the manufacturer conducts acceptance tests.
8.4 Types of control and testing standards selection of pipes, samples and specimens from the party or briefs shall be as specified in table 4.
Table 4 — Types of inspection and testing, selection norms
| The status of the test | Kind of test or control | Rule selection of pipes from the party |
The rate of sampling from each selected pipe |
| Mandatory | Control of chemical composition |
- | - |
| Control size and shape |
100% | - | |
| Control ovality |
- | ||
| Qualitative analysis of steel |
100% | - | |
| Visual inspection of surface quality |
100% | - | |
| Control of macrostructure |
2 | 2 | |
| Control of the microstructure (as pearlite, carbide mesh, depth bezoperatsionnogo layer) |
At least 2 | 1 | |
| Control of carbide segregation | At least 3 |
1 | |
| Control of contamination of non-metallic inclusions |
At least 6 |
1 | |
| Control of the microporosity | At least 6 |
1 | |
| Hardness control | 10% but not less than 3 |
1 | |
| Additional | Control of the chemical composition of the pipes |
1 | 1 |
Testing by nondestructive methods |
100% | - | |
Nondestructive testing methods for longitudinal defects |
100% | - | |
| |||
When the metal pipes placenow all the pipes bottoms are rejected.
8.5 Upon receipt of unsatisfactory results, at least one of the types of tests it conducted a re-test at twice the sample from the same batch, except for pipe which does not pass the test. The results of repeated tests apply to the entire party, including pipes, which were obtained unsatisfactory results during the initial testing, and are final.
Note — if re-testing is not enough pipe in the party, then the test every tube, including initially rejected, from which samples are taken from the opposite end.
Repeated tests on non-metallic inclusions is carried out on all types of non-metallic inclusions.
9 Methods of inspection and testing
9.1 Chemical composition of the steel is taken to document the quality of billets of the supplier. Compliance grade of steel test method of arcing or other non-destructive methods of control for each tube. If there is disagreement in assessing the quality of a full chemical analysis.
The analysis of the chemical composition of the steel of the finished pipe is carried out using standardized methods.
Allowed to apply other methods of analysis, providing the necessary accuracy corresponding to the specified standards.
The differences in the evaluation of the chemical composition used standardized methods of chemical analysis.
9.2 Inspection of pipes is carried out with the naked eye without the use of magnifying devices.
9.3 the depth of the defects on the outer surface of the pipe is determined after nudelove or Stripping of defects, measuring the depth of Stripping.
9.4 straightness of the pipe line check length of 1 m and a set of probes. The waviness of the outer surface of the cold-deformed tubes control line length 0.3 GOST 8026 and a set of probes.
The length of the tubes test tape according to GOST 7502.
The outer diameter and ovality is controlled with a micrometer smooth MK-type according to GOST 6507, staples sheet according to GOST and GOST 18360 18365.
The wall thickness of the pipe is controlled by micrometer type MT according to GOST 6507.
9.5 may be applied to control the size and shape of the pipes, other methods and means of measurement, metrological characteristics which provide the required measurement accuracy.
The differences in the evaluation of the measurement results is carried out in accordance with 9.3 and 9.4.
9.6 In order to control the microporosity and carbide segregation is allowed to use the samples to control non-metallic inclusions.
9.7 hardness Control is carried out according to GOST 9012. Allowed to conduct hardness testing on samples cut from pipes.
Allowed to carry out the measurement of hardness non-destructive method of control. If there are differences in the hardness testing carried out according to GOST 9012.
9.8 Control of macrostructure is carried out according to GOST 10243 without an increase in the transverse Templeton (ring samples) with a height of 20 mm, stained in aqueous solution of hydrochloric acid of 30% to 50% at a temperature of from 60 °C to 70 °C for 30 to 40 min.
9.9 Microstructure (perlite) test on transverse sections, stained in alcoholic solution of nitric acid of 2% to 4%. The sample is examined under a microscope at a magnification of from 450 to 600 times. May be performed in other etching reagents, or by electrolytic method. If there are differences in the etching is carried out in an alcohol solution of nitric acid of 2% to 4%. Photographing produce at a magnification of 500 times.
In the zone of acceptable depth of bezoperatsionnogo layer evaluation of the microstructure (granular perlite) do not produce.
Allowed to control the microstructure non-destructive methods. If there are differences in the metallographic method is used to control the microstructure.
9.10 testing performed eddy-current method according to ISO 10893−2, at the request of the customer.
9.11 testing for the presence of longitudinal defects ultrasound method churchyard 17410, size of artificial defect in the reference standard agreed between manufacturer and user.
9.12 the Depth bezoperatsionnogo layer test according to GOST 1763 method M in transverse sections, stained in 2−4% alcohol solution of nitric acid. The sample is examined under a microscope at a magnification of 100 times. If necessary, you can apply a greater increase.
9.13 non-metallic inclusions, microporosity, carbide liquation is determined on longitudinal sections of hardened, carbide mesh — hardened transverse sections.
Samples quenched at the heating temperature of 845°C±10°C, can withstand no more than 1.5 min per 1 mm thickness of the wall of the pipe at this temperature, cooled in oil and released at a temperature of from 150 °C to 170 °C for 1 h.
The rating of nonmetallic inclusions and microporosity spend on netravlenoy sections.
Evaluation of carbide mesh carbide segregation to produce thin sections, stained in 4% alcohol solution of nitric acid.
Nonmetallic inclusions is controlled on the samples under the microscope at a magnification of 90 to 110 times and when the diameter of the field of view from 1.1 to 1.3 mm.
Microporosity and carbide liquation of control on the samples under the microscope at a magnification of 90 to 110 times, and carbide mesh, while increasing from 450 to 600 times.
Allowed, except differences in the assessment of product quality, to evaluate carbide mesh for thin sections without prior quenching and tempering of the etched electrolytically in a solution: 1000 cmH
O, 150 g NaOH, 10 g of KMnO
.
9.14 sample Size for all inspection types under the microscope in transverse direction must be equal to the wall thickness of the pipe, and in the longitudinal direction 15 to 20 mm.
9.15 In the pipe check:
— microstructure — scale N 8 GOST 801 and figure A. 1 of Annex A
— the present standard;*
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* The text of the document matches the original. — Note the manufacturer’s database.
carbide liquation — scale N 6 GOST 801;
carbide grid — scale N 4 GOST 801;
— microporosity — scale N 7 GOST 801;
— point to the inhomogeneity and defects of the macrostructure in pipes of steel grades SHKH15-sh and SHKH15SG-sh — poliatlonu points and figures Annex B of this standard;
— nonmetallic inclusions — scales N 1, 2, and 3 GOST 801.
Evaluation of silicate inclusions is carried out on a scale of N 1 N 2 oxides or sulphides. If in the same field of view there are different inclusion types (oxides and silicates stroke brittle and ductile or plastic sulphides and silicates), the assessment is carried out collectively. The results of the evaluation are recorded in the column of oxides or sulphides.
If the score on the scale could not be carried out by comparison with one of the two neighboring points that allowed estimation of intermediate points 0,5; 1,5; 2,5 etc. in the absence of the controlled rate put a rating of «0». The microstructure is evaluated only at integer points.
10 manufacturer’s Warranty
The manufacturer guarantees the conformity of the pipes with the requirements of this standard, subject to the rules and regulations transportation and storage of pipes and compliance with operating conditions the purpose of the pipes.
Annex a (mandatory). The microstructure of the metal pipes
Appendix A
(required)
X500
Score 1A
Figure A. 1
Appendix B (mandatory). Point inhomogeneity and defects of a macrostructure of steel grades SHKH15-sh and SHKH15SG-sh and Unacceptable local defects of a macrostructure of steel grades SHKH15-sh and SHKH15SG-sh
Appendix B
(required)
Score 1
Score 2
Score 3
Score 4
XI
Invalid local defects of a macrostructure of steel grades SHKH15-sh and SHKH15SG-sh
Figure B. 1
Figure B. 2
XI
