GOST 22897-86

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  ГОСТ 22897-86

GOST 22897−86 seamless cold-deformed Pipes from alloys based on titanium. Specifications (with Amendments No. 1, 2)

GOST 22897−86

Group В62

INTERSTATE STANDARD

SEAMLESS COLD-DEFORMED PIPES
FROM ALLOYS BASED ON TITANIUM

Specifications

Seamless cold-deformed pipes from alloys based on titanium.
Specifications

ISS 23.040.15
GST 18 2510

Date of introduction 1988−01−01

INFORMATION DATA

1. DEVELOPED by the Ministry of ferrous metallurgy of the USSR

DEVELOPERS

E. A. Blyznyuky, Sokurenko V. P., Yu. M. Mironov, Yu. A. Shaposhnikov

INTRODUCED by the Ministry of ferrous metallurgy of the USSR

Member Of The Board V. G. Antipin

2. APPROVED AND put INTO EFFECT by Decision of the USSR State Committee for standards from 30.07.86 N 2297

Change No. 2 adopted by the Interstate Council for standardization, Metrology and certification (Protocol No. 10 dated 03.10.96)

The adoption of the changes voted:

3. REPLACE GOST 22897−77

4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

5. Limitation of actions taken by Protocol No. 2−92 of the Interstate Council for standardization, Metrology and certification (ICS 2−93)

6. EDITION with Amendments No. 1, 2 approved in February 1993, April 2001 (IUS 9−93, 7−2001)


This standard applies to seamless cold-drawn and cold-rolled tubes of alloys based on titanium.

(Changed edition, Rev. N 1).

1. ASSORTMENT

1.1. The pipe dimensions shall be as specified in table.1.

Table 1

1.2. The length of the pipe manufacture:

random:

length from 0.8 to 8.0 m, with a wall thickness of 0.5−0.8 mm

length from 1.0 to 8.0 m, with a wall thickness of 1.0 mm or more;

measuring in length not less than indicated in the table.1. In each batch of the measuring pipe 10 per cent of off-gage pipes;

dimensional, within dimensional, with an allowance for each cut of 5 mm.

Maximum deviations along the length of the tubes (multiple and dimensional) must not exceed +15 mm.

1.3. Limit deviations for outer diameter and wall thickness of pipes shall be as specified in table.2.

Table 2

At the request of the consumer it is allowed manufacture pipes internal diameter and wall thickness.

Tolerances for the inner diameter established by agreement between manufacturer and consumer.

(Changed edition, Rev. N 1).

1.4. At the request of the consumer pipe shall be manufactured with a combination of extreme deviations: the diameter deviations of usual precision, the thickness — increased accuracy.

1.5. Out-of-round pipes with wall thickness of 1 mm or more should take the pipe over the limit deviations for outer diameter.

1.6. Raznoshennoy pipes should not withdraw pipe for tolerances for wall thickness.

1.7. Curvature for 1 m length of the pipe should not exceed 1.5 mm.

The curvature of pipes with a diameter of less than 80 mm high accuracy of manufacture should not exceed 1 mm.

1.8. Theoretical weight of 1 m of pipe () in kilograms is calculated by the formula

,

where is the nominal outside diameter, mm;

 — nominal wall thickness, mm.

The relative density of the alloy is taken equal to 4.5 g/cm.

Examples of symbols

Pipe from alloy grade PT-7M outer diameter of 20 mm, a wall thickness of 2.0 mm, normal precision manufacturing, random length, standard quality of the surface:

Pipe 20x2 — PT-7M GOST 22897−86

The same manufacturing high precision on diameter and wall thickness, length, multiples of 1 m, a high surface quality (A):

Pipe 20пх2,0 пх1000 cu — PT-7M AND GOST 22897−86

The same conventional manufacturing precision diameter and high accuracy of wall thickness, length 7.0 m, ordinary quality of a surface:

Pipe 20х2пх7000 — PT-7M GOST 22897−86

(Changed edition, Rev. N 1).

2. TECHNICAL REQUIREMENTS

2.1. Pipe manufactured in accordance with the requirements of this standard and technical regulations approved in the prescribed manner.

2.2. Pipe shall be manufactured from alloys VT1-O, PT-1M, PT-7M and OT4 with chemical composition according to GOST 19807 and regulations.

(Changed edition, Rev. N 2).

2.3. Tubes are made of conventional and high surface quality.

2.4. Mass fraction of hydrogen in tubes with enhanced surface quality of alloys VT1-O, PT-1M, PT-7M shall not exceed 0.008% of grade alloy OT4 — rules given in GOST 19807.

In pipes of ordinary quality of surface hydrogen content is not standardized.

(Changed edition, Rev. N 1).

2.5. The metal’s mechanical properties the finished pipes shall be as specified in table.3.

Table 3

Note. Not listed in table.3 norms of mechanical properties are established by agreement between manufacturer and consumer.

2.6. The pipes must be etched or polished surface.

If heat treatment is carried out in vacuum or protective atmosphere, etching of pipes is not compulsory.

2.7. The outer and inner surfaces of tubes with high surface quality must be pure, without captivity, cracks, dents, etching and rashes, balances scale, scratches and deep tracks to repair defects.

Corrections of defects by the local sweep, continuous or local grinding, peskostrujnym inner surface, deep or inkjet-circular etching on the condition that they do not derive a diameter and pipe wall thickness for the ultimate sub-zero deviations.

(Changed edition, Rev. N 1).

2.8. On the surface of pipes with normal surface without Stripping allowed roughness, scratches, and dings risks, provided that they do not take wall thickness outside negative dimensions.

2.9. On the surface of the tubes should not be alteromonas layer.

2.10. The pipe ends should be square-cut and cleaned of burrs.

2.11. Pipes made of alloys PT-1M, PT-7M, VT1-ABOUT 40 mm in diameter and less shall withstand without cracking or tears test for distribution, an amount equal to 10% of the original outside diameter.

2.12. Pipes made of alloys VT1-O, PT-1M, PT-7M shall withstand without cracking or tears test flattening to obtain sludinajumi between surfaces, distances are in millimeters:

for pipes with a ratio equal to 15 and less than calculated by the formula

,

where is the nominal wall thickness, mm;

 — nominal outside diameter, mm;

 — the stiffness coefficient, calculated according to the formula

;

for pipes with a ratio of 15 to 20 incl. =0,5;

for pipes with a ratio of 20 to 30 incl. = 0,4;

for pipes with a ratio of more than 30= 0.3 mm.

Allowed when testing on the hand and flattening of the tubes in the presence of surface defects referred to in PP.2.7, 2.8, without the formation of cracks and tears

s.

2.13. Pipes must be tight at the maximum pressure of 58.8 MPa (600 kgf/cm).

2.14. At the customer’s request pipes are subjected to ultrasonic testing in the sensitivity setting of ultrasonic equipment for artificial reflectors of the type of risks that are deposited on outer and inner surfaces of standard samples having a depth of 10% of the nominal wall thickness for pipes with external diameter more than 5 and up to 10 mm, inclusive, and 5% of the wall thickness, but not less than 15 µm for pipes with diameter more than 10 and up to 60 mm. Length of artificial reflector 10 mm.

(Changed edition, Rev. N 2).

3. ACCEPTANCE RULES

3.1. Pipes take by the parties. The party must consist of one pipe of alloy grades, one melting, one size, subjected to heat treatment under the same conditions, and be accompanied by a document about quality that contains:

trademark or the name and trademark of manufacturer;

the symbol of the pipes;

batch numbers and heats are included in it;

the weight of the batch;

the number of pipes and total length of pipe in meters;

the results of the tests;

the number of the box, which is Packed in tubes;

the chemical composition of the alloy.

The number of tubes in a batch must not exceed:

300 pieces — with the diameter up to 30 mm incl.;

200 pieces — with the diameter from 30 to 76 mm incl.;

100 PCs at a diameter of 76 mm.

Allowed to make a lot of pipes manufactured from workpieces of different heats.

The prepared batch is assigned reference number.

When combined in one batch several heats in a quality document indicate the number of heats of all parties and compliance of the chemical composition of the alloy grade.

It is allowed to combine pipes of different parties into one shipment for further processing, if they were subjected to vacuum treatment before combining.

At the request of the consumer in the document of quality which indicate the mode of heat treatment.

3.2. Check the outer and inner surfaces, dimensions, ultrasonic testing shall be subjected to each pipe of the party.

3.1, 3.2. (Changed edition, Rev. N 1).

3.3. From each batch of pipes to test for flattening, stretching, the distribution and control of hydrogen content in the tubes increased the surface quality of selected 2% of the pipes, but at least two pipes from the party.

Test distribution is carried out at the request of the consumer.

3.4. Chemical composition and grade attended in the document about the quality of the manufacturer of the workpiece.

(Changed edition, Rev. N 1).

3.5. The content of hydrogen in the pipes of high surface quality check for two tubes of the batch to the manufacturer.

If unsatisfactory results of the analysis to the hydrogen pipe is subjected to continuous control or heat treatment in vacuum.

3.6. If unsatisfactory test results of at least one of the indicators it is carried out re-testing at twice the sample taken from the same batch. The results of repeated tests apply to the entire party.

Allowed the manufacturer if unsatisfactory test results to conduct continuous inspection of the tubes.

4. TEST METHODS

4.1. From each designed to test a pipe select:

for the tensile test and flattening two of the sample;

testing the distribution and control of hydrogen content is one sample.

Samples cut from the ends of the pipe.

In the selection of two samples cut should be one on each end of the pipe.

4.2. Check outer surface of the pipe is carried out visually, and internal — through the periscope.

Quality control external and internal surfaces of pipes with a high surface quality is carried out by nondestructive methods (testing).

Monitoring of the internal surfaces of pipes with an internal diameter less than 8 mm is carried out according to the method of the manufacturer.

4.3. The diameter control of both ends of the pipe with a micrometer type MK according to GOST 6507 or staples sheet according to GOST 18360, 18365 GOST.

Wall thickness is controlled by thickness gauge or micrometer tubular type MT churchyard 6507 both ends not less than four points, located in mutually perpendicular planes.

Allowed control of the diameter and wall thickness by other methods that ensure the required measurement accuracy.

If there are differences in the control of diameter and wall thickness is carried out with a micrometer.

The length of the tubes control the metal tape according to GOST 7502.

(Changed edition, Rev. N 1, 2).

4.4. The tensile test is carried out on a short longitudinal samples according to GOST 10006 host 19040.

4.5. Test flattening is carried out according to GOST 8695.

The measurement of the clearance is carried out under load.

4.6. Test distribution is carried out in cold condition according to GOST 8694 on the mandrel taper 1:10 (with the taper angle 30°). You may use a mandrel with large taper.

4.7. Testing of tubes by hydraulic pressure is carried out according to GOST 3845 with time under pressure of not less than 10, while allowable stress shall be equal to 40% of the temporary tear resistance for this brand of alloy taken for the lower limit

Allowed a test of the hydraulic pressure to be replaced by NDT methods according to the normative documentation of the manufacturer of pipes, duly approved.

If there is disagreement in assessing the quality of the test pipe is carried out hydraulic pressure.

(Changed edition, Rev. N 2).

4.8. Determination of hydrogen content is carried out according to normative-technical documentation.

4.9. Non-destructive testing is carried out according to normative-technical documentation.

4.10. The curvature of the pipes checked straightedge according to GOST 8026 probe on the other 2−034−225.

4.11. The line pipe alloy grade check on telescope or other methods.

If you cannot determine the brand of alloy steeloscopes the line pipe alloy grade is allowed to take the document about the quality of the manufacturer of billets.

4.10, 4.11. (Changed edition, Rev. N 1).

4.12. The lack alteromonas layer in the pipes is guaranteed by the manufacturer of the pipes. In case of disagreement between the manufacturer and the consumer availability alteromonas layer checks on the control samples according to normative-technical documentation.

(Added, Rev. N 1).

5. MARKING, PACKAGING, TRANSPORTATION AND STORAGE

5.1. Each tube with a diameter of 18 mm and over with wall thickness of 2.5 mm at a distance of not more than 50 mm from one end should be clearly marked with the stamp of technical control of the manufacturer, grade, lot number and number of pipe (for pipes with high quality surface).

5.2. On each pipe diameter less than 18 mm or a wall thickness less than 2.5 mm at a distance of not more than 50 mm from one end of electrocorundum should be clearly marked: grade, batch number, number of pipe (for pipes with a high surface quality) and bear the stamp of the technical control of the manufacturer.

5.3. All pipes of high surface quality, as well as the usual quality of the surface diameter less than 20 mm with a wall thickness of less than 1.5 mm, and the tubes with a ratio of at least 30 must be Packed weighing up to 500 kg in wooden boxes with a length of up to 8.5 m, made according to GOST 2991 (type III-2) or according to GOST 10198 (type I-1), with internal struts and pads of paper according to GOST 8828 or GOST 8273 for protection against mechanical damage.

The boxes shall be sealed with the corners of the steel packing strips or belts of tape according to GOST 2991. Pipe for export are Packed in boxes type III-2 according to GOST 24634 in accordance with GOST 2991.

5.4. To each individual package of tubes in boxes, must be attached to plywood, metal or plastic label according to GOST 14192, which should be clearly marked:

trademark or the name and trademark of manufacturer;

the symbol of the pipes;

the number and total length of pipe in meters;

batch number.

5.5. All pipes of ordinary quality surface, whose dimensions are not specified in paragraph 5.4, should be firmly Packed in transport packages weighing up to 5000 kg according to normative-technical document. The length of the packet pipe must not exceed 8.5 m. the Packages must be evenly aligned along the length of the at least two areas for pipes of length 4 m, not less than three places for pipe length up to 7 m and not less than four places for pipes length more than 7 m. In the transverse direction of the link packages not less than two turns. The rest of the pipe, Packed in boxes should be formed into transport packets.

Linking packages should be a wire with a diameter of 5 mm according to GOST 3282 or steel tape cross-section is 1.2−1,8x30 mm according to GOST 3560. To link packages of thin-walled tubes with a diameter of 5.8 to 57 mm weight, not exceeding 3.0 t allowed to use a metal tape of size not less than 0,9x19 mm according to GOST 3560, GOST 503 or other normative and technical documentation or to use a pipe diameter of 6 mm with a wall thickness of 0.6−1.0 mm, made according to normative-technical documentation.

Binding material is not a device for zastroyki.

(Changed edition, Rev. N 2).

5.6. Each overpack shall be accompanied by a label according to GOST 14192, which should be clearly marked:

trademark or the name and trademark of manufacturer;

grade;

the size of the pipes;

precision manufacturing;

the designation of this standard.

On one side of each box must be clearly applied transportation labels (basic, additional and informational inscriptions) and handling mark «sling here», which should correspond to GOST 14192.

The markings on the boxes cause the coloring on the stencil.

5.7. Packaging and transport tubes are designed for areas far North and equated localities, — according to GOST 15846.

5.8. Transportation of pipes is carried out by all kinds of transport in covered vehicles in accordance with cargo carriage regulations applicable to transport of this species.

Tubes in boxes or bags allowed to be transported in open rolling stock.

5.9. Pipes shall be stored in covered premises sorted into sizes and grades.