TU 14-3-1070-81

TU 14-3-1070-81

These technical conditions apply to seamless cold- and heat-deformed extra-thin-walled pipes made of steel grades 06Kh18N10T, 08Kh18N10T, 09Kh18N10T and 06Kh16N15M3B (type EI-847).

At the customer's request specified in the order, pipes are delivered taking into account the requirements of "Terms of Delivery" No. 01-1874-62 (UP No. 01-1874-62) or NP 071-06 "Rules for assessing the conformity of equipment, components, materials and semi-finished products delivered to nuclear facilities". The document on the quality of the pipes is stamped and signed by the head of the quality control section, and also, when delivering pipes with special requirements, the mark "for NPP" or the stamp and signature of the representative of the 2655th Military Police Department of the Ministry of Defense of the Russian Federation.

Example of a symbol entry

A pipe with an outer diameter of 60 mm, high precision (b), wall thickness of 0.4 mm, extra-high precision (ov), measured length of 4000 mm, made of 08X18N10T steel, open-melting with subsequent vacuum-arc remelting.

Pipe 60v x 0.4ov x 4000 - 08Kh18N10T-VD TU 14-3-1070-81

A pipe with an internal diameter of 35 mm, high precision (in), a wall thickness of 0.5 mm, high precision (in), a multiple of 1500 mm in length, made of 06Kh16N15M3B steel (type EI-847) by vacuum-induction smelting with subsequent vacuum-arc remelting.

Pipe vn35v x 0.5v x 1500kr - 06X16N15M3B-ID TU 14-3-1070-81

(Changed edition, Amendment No. 1, 2, 5, 6, 8)

1 ASSORTMENT

1.1 The dimensions of the pipes must correspond to those specified in Table 1.

1.2 In accordance with orders, pipes must be supplied:

a) measured length within the limits:

1) 0.5-3.0 m with an outer diameter from 4 to 6 mm inclusive;

2) 0.5-7.5 m with an outer diameter from 6 to 25 mm inclusive, as well as with an outer diameter of 26 mm and 27 mm with a wall of 0.3-0.4 mm;

TU 14-3-1070-81

Table 1

Outer diameter, mm	Wall thickness, mm
From 4.0 to 6.0 incl. « 6.2 « 10.0 « « 10.2 « 25.0 « « 25.2 « 60.0 « « 60.2 « 80.0 «	0.2-0.5 incl. 0.2-0.7 « 0.2-1.0 « 0.3-1.0 « 0.3-1.0 «
Notes 1 Pipes are manufactured with a diameter interval of 0.2 mm. When designing new machines and mechanisms, it is recommended to select pipes with a diameter interval of 0.5 mm, starting with a diameter of 25 mm and above. 2 According to the wall thickness, pipes are manufactured with an interval of 0.05 mm for wall thicknesses up to and including 0.5 mm and 0.10 mm for wall thicknesses over 0.5 mm. 3 For existing installations, it is permitted to manufacture non-standard pipe sizes with diameters of 5.5; 6.1; 6.9; 10.5; 14.1; 14.5; 19.5; 44 mm. 4 Pipes with diameters from 60.2 to 80 mm are supplied in a work-hardened condition. In this case, all technical requirements are stipulated by agreement of the parties.

(Changed edition, Amendment No. 1)

3) 0.5-4.0 m with an outer diameter of more than 25 mm.

The permissible deviation in length should not exceed +10 mm.

By agreement of the parties, delivery of measuring pipes up to 9.0 m long is permitted.

b) multiple length within the non-dimensional limits with an allowance for each cut of 5 mm and an acceptable deviation along the entire length of +10 mm;

c) unmeasured length within 0.5-8.0 m.

1.3 The maximum deviations in dimensions must correspond to those specified in Tables 2 and 3.

Table 2

External or internal diameter, mm	Maximum deviations in diameter, mm
	With wall thickness up to 0.5 mm incl.		With wall thickness from 0.6 to 1.0 mm
	high precision	extra high precision	high precision	extra high precision
Up to 6.0 incl. St. 6.0 « 10.0 « « 10.0 « 20.0 « « 20.0 « 35.0 « « 35.0 « 60.0 « « 60.0 « 80.0 «	±0.05 ±0.07 ±0.07 ±0.08 ±0.09 ±0.10	±0.04 ±0.04 ±0.05 ±0.06 ±0.07 ±0.08	- ±0.07 ±0.08 ±0.10 ±0.15 ±0.20	- - ±0.05 - - -

TU 14-3-1070-81

Table 3

Wall thickness, mm	Maximum deviations in wall thickness, mm
	high precision	extra high precision
0.2 - 0.35 0.4 - 0.50 0.6 - 1.0	±0.05 ±0.07 ±10%	±0.03 ±0.04 ±8%
Note: At the customer's request, pipes of varying degrees of accuracy in diameter and wall thickness can be supplied.

1.4 Pipes are supplied by:

a) by outer diameter and wall thickness - for pipes of all sizes;

b) by internal diameter and wall thickness - for pipes with a diameter of 17 mm and above.

The maximum deviations for the internal diameter must correspond to the equal maximum deviations for the external diameter.

Notes

1 By agreement of the parties, delivery is permitted for pipes with an internal diameter of less than 17 mm.

2 By agreement of the parties, delivery of pipes with internal and external diameters is permitted.

1.5 The ovality of pipes with dimensions located to the right of the dividing line of Table 4 must be within the permissible deviations in diameter. The ovality of pipes with dimensions located to the left of the dividing line is not controlled; the perimeter of the pipes is controlled.

1.6 The variation in wall thickness of pipes should not take the wall thickness beyond the permissible deviations.

1.7 The curvature of pipes with a diameter of 5.0 to 60 mm at any section of the length shall not exceed 1.5 mm per 1 m of length. The curvature of pipes with a diameter of less than 5.0 mm shall not exceed 3.0 mm per 1 m of length. The curvature of cold-worked pipes with a diameter of 60.2-80 mm at any section of the length shall not exceed 1.5 mm per 1 m of length. Curvature shall be checked using a straightedge and a set of feeler gauges.

1.8. (Excluded, Amendment No. 8)

TU 14-3-1070-81

Table 4

Diameter, mm

Wall thickness, mm

0.2

0.25

0.3

0.35

0.4

0.45

0.5

0.6

0.7

0.8

0.9

1.0

Up to 10 incl.

St. 10 « 12.0 «

« 12.0 « 14.0 «

« 14.0 « 16.0 «

« 16.0 « 18.0 «

« 18.0 « 20.0 «

« 20.0 « 22.0 «

« 22.0 « 24.0 «

The diameter is measured with a micrometer or a caliper.

« 24.0 « 26.0 «

Measuring the perimeter of the product is carried out in a passable and non-passable manner running caliber

« 26.0 « 28.0 «

« 28.0 « 30.0 «

« 30.0 « 35.0 «

« 35.0 « 40.0 «

« 40.0 « 45.0 «

« 45.0 « 50.0 «

« 50.0 « 60.0 «

« 60.0 « 80.0 «

TU 14-3-1070-81

2 TECHNICAL REQUIREMENTS

2.1 Pipes must be manufactured in accordance with the requirements of these technical conditions and according to technological regulations approved in the established manner, from steel grades:

- 06Х18Н10Т, 08Х18Н10Т, 09Х18Н10Т open smelting and open smelting with subsequent electroslag (-Ш) or vacuum-arc (-ВД) remelting;

- 06Kh16N15M3B (type EI-847) vacuum-induction melting with subsequent electroslag (-ISh) or vacuum-arc (-ID) remelting.

The pipes are made from pipe blanks according to TU 14-1-790, TU 14-1-2694, TU 14-1-3935 and TU 14-1-5310, turned and bored after hot processing.

(Changed edition, Amendment No. 2, 6, 8)

2.2 The chemical composition of the pipe metal must comply with the requirements of the technical specifications for pipe blanks TU 14-1-2694, TU 14-1-790, TU 14-1-3935 and TU 14-1-5310.

(Changed edition, Amendment No. 2)

Table 5. (Excluded, Amendment No. 2)

2.2.1, 2.2.2, 2.2.3, 2.2.4. (Excluded, Amendment No. 2)

2.3 Pipes with a diameter of up to 60 mm are supplied in a heat-treated condition. Calibration of pipes after heat treatment with a deformation degree by diameter of no more than 2% is allowed. Non-exceeding the maximum deformation degree during calibration is guaranteed by the technology.

2.4 In the metal of pipes in the delivered condition, the content of non-metallic inclusions for all smelting methods must not exceed the standards specified in Table 6.

(Changed edition, Amendment No. 6)

2.5 The austenitic grain size of the metal of the pipes in the delivery condition must be within the range of numbers 7-10 according to GOST 5639; up to 25% of pipes with a grain size no larger than number 6 are allowed in separate packaging.

(Changed edition, Amendment No. 6)

TU 14-3-1070-81

Table 6

Type of non-metallic inclusions	Evaluation in points, no more, for steel grades
	06Х18Н10Т, 08Х18Н10Т, 09Х18Н10Т	06Х16Н15М3Б (type EI-847)
Oxides	1	0.5
Sulfides	1	0.5
Non-deformable silicates (globules)	1	0.5
Sum of previous types by the worst place of the section	2	1
Titanium nitrides and carbonitrides	2	-
Niobium nitrides and carbonitrides	-	1.5

(Changed edition, Amendment No. 6, 7)

2.6 The mechanical properties of heat-treated pipe samples (as delivered) must be no less than those specified in Table 7.

Table 7

Steel grade	Test temperature, °C	Mechanical properties, not less than
		Ultimate strength σ in , N/mm² (kgf/mm²)	Yield strength σ 0.2 , N/mm² (kgf/mm²)	Relative elongation δ 5 , %
06Х18Н10Т	20	529 (54)	-	40
08Х18Н10Т	20	529 (54)	-	40
09Х18Н10Т	20	549 (56)	-	40
06Х16Н15М3Б (type EI-847)	20	539 (55)	-	35
	375	372 (38)	157 (16)	20
	650	333 (34)	-	20
Note - By agreement of the parties, pipes made of steel grades 06Kh18N10T, 08Kh18N10T, 09Kh18N10T may be tested at elevated temperatures. The test results are optional, but are recorded in the certificate.

(Changed edition, Amendment No. 2, 6)

2.7 Pipes in the delivered condition shall not be susceptible to intercrystalline corrosion after provocative tempering.

2.8 Pipes must withstand a hydraulic pressure test determined by the formula:

TU 14-3-1070-81

P = (1)

where P is the test pressure, MPa;

S - minimum pipe wall thickness, mm (minus the negative maximum deviation);

R - permissible stress equal to 40% of the tensile strength, MPa;

Dv - inner diameter of the pipe, mm.

Hydraulic pressure is provided by the manufacturer without testing.

Each pipe with a diameter of 10 mm or less is subject to pneumatic testing with a pressure of 0.3 to 0.5 MPa (3-5 atm).

2.9 The surface of the pipes, depending on the requirement specified in the order, must be as follows:

a) etched outer and inner;

b) polished external and etched internal;

c) electrochemically polished external and etched internal;

d) electrochemically polished external and internal;

d) external and internal after heat treatment in a vacuum or hydrogen atmosphere;

g) etched external and electrochemically polished internal;

c) polished external and electrochemically polished internal.

It is permissible to supply pipes with a surface after heat treatment in a vacuum or hydrogen atmosphere instead of polished or etched, at the discretion of the pipe manufacturer.

(Changed edition, Amendment No. 6)

2.9.1 Pipes with an internal electrochemically polished surface are manufactured with an internal diameter over 6 mm. Pipes with an internal diameter over 6 to 8 mm inclusive are manufactured with a length of no more than 3 m.

(Changed edition, Amendment No. 6)

TU 14-3-1070-81

2.10 The surface of the pipes in the delivered condition must not have cracks, films, cavities, hairlines, folds, tears, deep scratches, dents, burns, or etching rash.

2.11 Local or complete cleaning of defects is permitted, provided that the wall thickness in the cleaning areas does not exceed the minus tolerance. The areas of cleaning of defects must be processed to a quality corresponding to the rest of the pipe surface.

2.12 Minor defects caused by the manufacturing method are allowed on the outer and inner surfaces: scores, scratches up to 0.015 mm deep, small gentle dents, local mesh resulting from uneven metal etching, ring marks from boring the workpiece, ripples and roughness, provided that the depth of these defects during control cleaning in one or more places does not exceed 0.02 mm. Repair of local gentle distortions of the pipe profile (dents) is allowed.

The dimensions of the slaughterhouses, the repair of which is permitted, are determined by external appearance samples.

The quality of the external and internal surfaces must correspond to the samples of appearance and acceptable defects agreed upon in the established manner.

(Changed edition, Amendment No. 6)

2.13 The ends of the pipes must be cut at a right angle, which is ensured by cutting technology, and cleaned of burrs.

(Changed edition, Amendment No. 2)

2.14 Each pipe must undergo ultrasonic testing along its entire length and surface.

(Added additionally, Amendment No. 2)

3 ACCEPTANCE RULES AND TEST METHODS

3.1 Each pipe in the batch must be inspected and measured.

TU 14-3-1070-81

3.2 Before cutting to size, pipes are tested in process batches. One process batch includes pipes of the same nominal size, one melt and one heat treatment mode.

Pipes in the delivery condition are handed over to the customer in delivery lots. A delivery lot is formed from pipes of one technological lot.

The number of pipes in a technological batch is no more than 300 pcs.

The number of pipes in the delivery batch is no more than 500 pieces.

(Changed edition, Amendment No. 8)

3.3 Control of the diameter or perimeter is performed along the entire length using non-destructive testing means in accordance with the manufacturer's technological instructions.

Before the introduction of non-destructive testing of pipes, the diameter or perimeter of pipes is controlled using micrometers, calipers and gauges in the following order:

- the outer diameter of pipes with dimensions located to the right of the dividing line of table 4 is controlled by a micrometer or a caliper;

- the outer diameter (perimeter) of pipes supplied according to the outer diameter and wall thickness, with dimensions located to the left of the dividing line of Table 4, is controlled by a pass-through ring gauge along the entire length of the pipe and a no-go ring gauge at each end.

The nominal dimensions of ring gauges must correspond to:

a) passage ring - the maximum permissible outer diameter of the pipe;

b) no-go ring - the minimum permissible outer diameter of the pipe.

Ring gauges must comply with GOST 24851 and GOST 24853.

Forced movement of gauges along the pipe is permitted with a force that does not result in damage to the pipe surface.

The internal diameter (perimeter) of pipes of all sizes, supplied by internal diameter and wall thickness, is controlled by a plug gauge

TU 14-3-1070-81

100 mm long at each end and a no-go plug gauge at each end.

The nominal dimensions of the plug gauges must correspond to:

a) a through gauge plug - the minimum permissible internal diameter of the pipe;

b) no-go plug gauge - the maximum permissible internal diameter of the pipe.

Plug gauges must comply with GOST 24851 and GOST 24853.

(Changed edition, Amendment No. 2, 6, 7)

3.4 The wall thickness of pipes must be controlled along the entire length and surface using devices in accordance with the manufacturer's technological instructions.

(Changed edition, Amendment No. 6, 7)

3.5 Inspection of the outer surface of the pipes is carried out visually or with a magnification of at least 1.5 times, and inspection of the inner surface is carried out with a periscope.

Prior to the development of small diameter periscopes, pipes with an internal diameter of 9 mm or more were subjected to periscopic inspection.

(Changed edition, Amendment No. 5, 6)

3.6 Each pipe is checked along its entire length with an ultrasonic flaw detector according to ICU-3 for the presence of defects on the outer and inner surfaces.

The equipment is adjusted to an artificial longitudinal mark of length (10 ± 1) mm, applied to the outer and inner surfaces of the standard sample and having a depth of (10 ± 1)% of the nominal wall thickness.

For pipes with an internal diameter of less than 4.4 mm, it is permitted to adjust the equipment according to a standard sample that has only an external artificial mark.

(Changed edition, Amendment No. 5, 6, 7)

3.7 The chemical composition of the pipe metal is accepted according to the certificate for the pipe blank, except for carbon, the content of which is checked on finished pipes. Deviation of the mass fraction of carbon in accordance with GOST 5632 is allowed. Nitrogen control is performed only in the case of heat treatment of pipes in an atmosphere of dissociated ammonia.

TU 14-3-1070-81

The results of the control are recorded in the certificate.

Carbon is controlled using the coulometric method according to GOST 12344, and nitrogen is controlled according to GOST 12359.

Note - The manufacturer is allowed to control the carbon content by another method agreed with the customer. In the case of arbitration tests, control is carried out by the coulometric method according to GOST 12344.

The steel grade of each pipe is checked using a steeloscope.

If necessary, the content of other elements can be checked on finished pipes.

(Changed edition, Amendment No. 2, 6)

3.8 To control the quality of the metal pipes, the following number of samples are taken from the process batch:

a) for testing mechanical properties at room and elevated temperatures from 3% of pipes in a batch (one sample from a pipe for each type of test), but not less than three pipes in a batch;

b) for testing for intercrystalline corrosion and grain size, one sample from each pipe;

c) to control the content of carbon and nitrogen, non-metallic inclusions - from 3% of pipes in a batch (one sample from a pipe for each type of test), but not less than from three pipes in a batch;

d) for inspection of the inner surface of pipes with an internal diameter of less than 9 mm - 3% of pipes from a batch, but not less than three pipes (one branch pipe not less than 100 mm long from the pipe).

(Additionally introduced, Amendment No. 6)

The standards are given taking into account the requirements of UP No. 01-1874-62.

(Additionally introduced, Amendment No. 6)

Note - It is permitted to take samples for mechanical testing and determination of carbon content from pipes of non-dimensional length that are recognized as suitable after other types of testing have been carried out.

1 (Excluded, Amendment No. 8)

TU 14-3-1070-81

2 (Changed edition, Amendment No. 8)

3.9 Tests of mechanical properties of pipes at room temperature on longitudinal samples are carried out in accordance with GOST 10006.

Tests at room temperature can be performed on transverse samples instead of tests on longitudinal samples according to the VNITI method.

Tests of mechanical properties of pipes at elevated temperatures are carried out in accordance with GOST 19040.

Note - The results of tests of mechanical properties of pipes on transverse samples are optional and are recorded in the certificate. After collecting the data, standards are established.

(Changed edition, Amendment No. 2)

3.10 Control of non-metallic inclusions is carried out according to the VNIITI method No. 7-96.

(Changed edition, Amendment No. 5)

3.11 The austenite grain size is assessed according to GOST 5639, VNITI methodology No. 7-95 on longitudinal sections. It is permitted to control the grain size of the pipe using non-destructive instrumental methods.

(Changed edition, Amendment No. 2, 5)

3.13 Pneumatic testing of pipes is carried out by immersing a pipe filled with compressed air in water. The tightness of the pipe is checked visually. The pipes are kept under pressure for at least 5 s.

(Changed edition, Amendment No. 2, 5)

3.14 The curvature of the pipes is checked using a ruler and feeler gauge.

3.15 In case of unsatisfactory results of any of the tests provided for in paragraphs 3.9, 3.10 of these TU, this test is repeated on a double number of pipes from the same batch that were not subjected to inspection. In this case, in case of unsatisfactory results of repeated tests,

TU 14-3-1070-81

at least on one sample, all pipes in the batch are subjected to the same type of testing for which unsatisfactory results were obtained.

Pipes that show unsatisfactory results in any of the tests, both during the initial and repeated testing, are rejected.

Repeated heat treatment of pipes rejected during testing in accordance with paragraphs 3.9 and 3.11 is permitted, with their submission for delivery as new batches.

Note: For pipes rejected due to intercrystalline corrosion, stabilizing heat treatment is permitted with their submission for delivery as a new batch.

4 MARKING, PACKAGING, TRANSPORTATION AND STORAGE

4.1 Each pipe with a diameter of 5 mm or more must be marked with the batch number and the pipe number on a section no longer than 20 mm from the end. When delivering measuring pipes, the marked section is included in the length specified in the order.

In case of delivery of pipes of multiple length, only one end of the pipe is marked. The marked section is included in the length of the multiple.

Distortion of the pipe profile is allowed in the marking area.

Pipes with a diameter of less than 5 mm are not individually marked, but are delivered in packs to which a label is attached.

4.2 Finished pipes must be shipped in wooden boxes.

Each box must be labeled with a tag that clearly states:

a) name of the manufacturer;

b) steel grade;

c) number of pipes;

d) batch number;

d) the number of these technical conditions.

Each pack of pipes must be accompanied by a label with the same data.

(Changed edition, Amendment No. 5)

TU 14-3-1070-81

4.3 Each batch of pipes must be accompanied by a document (certificate) certifying the quality and compliance of the pipes with the requirements of these technical conditions.

The document must contain:

a) name of the manufacturer;

b) (Excluded, Amendment No. 8)

c) steel grade;

d) chemical composition of steel;

d) the melt number and the number of technical specifications for the tubular blank;

e) batch number;

g) quantity and numbers of pipes;

c) size of pipes;

i) the results of all tests;

k) heat treatment mode;

l) the number of these technical conditions;

m) signature of the head of the quality service and the customer's representative, certifying the quality of the pipes and their compliance with the requirements of these technical conditions.

(Changed edition, Amendment No. 7)

4.4 Pipes are transported by rail in accordance with GOST 10692 or by road transport.

(Changed edition, Amendment No. 5)

4.5 Other requirements for labeling, packaging, transportation and storage must comply with GOST 10692.

(Additionally introduced, Amendment No. 6)

Appendix 2a (Excluded, Amendment No. 5) .

Appendix 4 (Excluded, Amendment No. 6) .

TU 14-3-1070-81

Applications:

- A (mandatory) - "List of documents referenced in the text of the technical specifications."

- B (informative) - "List of measuring instruments for monitoring the parameters of pipes manufactured according to TU 14-3-1070-81".

- B (mandatory) - "Registration sheet of changes to technical specifications".

The examination was carried out:

TU 14-3-1070-81

SCROLL

documents referenced in the text of the technical specifications

Table A.1

Designation and name of ND	Number of section, subsection, paragraph, appendix in which the reference is given
Delivery conditions UP No. 01-1874-62	Introduction, 3.8
NP 071-06 Rules for assessing the conformity of equipment, components, materials and semi-finished products supplied to nuclear energy facilities	Introduction
GOST 5639-82 Steels and alloys. Methods for detection and determination of grain size	2.5, 3.11
GOST 6032-2003 Corrosion-resistant steels and alloys. Test methods for resistance to intercrystalline corrosion	3.12
GOST 6507-90 Micrometers. Specifications	Appendix B
GOST 7164-78 Automatic tracking balancing devices GSP. General specifications	Appendix B
GOST 7502-98 Measuring metal tapes. Specifications	Appendix B
GOST 8026-92 Verification rulers. Technical conditions	Appendix B
GOST 10006-80 Metal pipes. Tensile testing method	3.9
GOST 10692-80 Steel, cast iron pipes and connecting parts to them. Acceptance, marking, packaging, transportation and storage	4.4, 4.5
GOST 12344-2003 Alloyed and high-alloy steels. Methods for determining carbon	3.7
GOST 12359-99 Carbon, alloyed and high-alloy steels. Methods for determining nitrogen	3.7
GOST 19040-81 Metal pipes. Method of tensile testing at elevated temperatures	3.9
GOST 24851-81 Smooth gauges for cylindrical holes and shafts. Types	3.3

TU 14-3-1070-81

Continuation of Table A.1

Designation and name of ND	Number of section, subsection, paragraph, appendix in which the reference is given
GOST 24853-81 Smooth gauges for sizes up to 500 mm. Tolerances	3.3, Appendix B
GOST R 50342-92 Thermoelectric converters. General specifications	Appendix B
TU 14-1-790-73 Pipe blanks made of corrosion-resistant steel grades for electropolished pipes	2.1, 2.2
TU 14-1-2694-79 Tubular blank made of corrosion-resistant steel grade 06X16N15M3B (type EI 847)	2.1, 2.2
TU 14-1-3935-85 Pipe blanks made of low-carbon corrosion-resistant steel and alloys for thin-walled and extra-thin-walled pipes	2.1, 2.2
TU 14-1-5310-95 Tubular blank made of low-carbon corrosion-resistant steel grades 06X18N10T, 08X18N10T, 12X18N10T	2.1, 2.2
TU 2-034-225-87 Probes. Models 82002, 82105, 82302	Appendix B
TU 25-1894.003-90 Mechanical stopwatches. Technical conditions	Appendix B
Methodology No. 7-95-87 Determination of the austenite grain size in Kh18N10T and Kh15N16M3B steels using additional scales to GOST 5639-82	3.11
ICU-2-2000 Technological instruction for ultrasonic testing of wall thickness of pipes made of stainless steels and alloys	3.3, 3.4

(Changed edition, Amendment No. 2, 3, 6, 8, PI)

TU 14-3-1070-81

Appendix B

(informative)

SCROLL

measuring instruments for monitoring the parameters of pipes manufactured according to TU 14-3-1070-81

Table B.1

Name of the controlled parameter	Name of the measuring instrument	Type SI	Accuracy class, error	Division value, mm	Measurement limit, mm	ND on SI
Outside diameter of pipes	Micrometer	MK	CT 2	0.01	0-25 25-50 50-75 75-100	GOST 6507
	Ring gauge	-	-	-	10-100	GOST 24853
Wall thickness	Micrometer	MT	CT 2	0.01	0-25	GOST 6507
Holding time	Stopwatch	SOSpr - 2b-2	CT 2	0.2 sec	0-60 sec	TU 25-1894.003
Temperature	Thermoelectric converter with automatic potentiometer	THA KSP-3	PG ±8.3 °C CT 0.5	- 10 °C	- 0-1100 °C	GOST R 50342 GOST 7164
Curvature	Verification ruler	SD-1000	CT 2	-	0-1000	GOST 8026
	Set of feeler gauges	№4	CT 2	-	0.1-5.5	TU 2-034-225
Length of pipes	Measuring tape, metal	-	CT 2	1.0	0-10000	GOST 7502
Note - It is permitted to use individual, newly developed or already in use measuring instruments that satisfy the required characteristics in terms of accuracy.

(Changed edition, Amendment No. 2, 6, PI)

Amendment No. 9 to TU 14-3-1070-81

Appendix B

(required)

AM Method

B.1 Essence of the method

Steel samples are kept in a boiling aqueous solution of copper sulfate and sulfuric acid in the presence of metallic copper.

B.2 Before testing, the sample blanks are subjected to provocative heating at a temperature of 640 to 660 °C with a holding time of (120±3) min, and cooled in air.

It is permissible to subject samples to provocative heating.

In case of disagreement in the evaluation of test results, the sample blanks are subjected to provocative heating.

B.3 Reagents

Copper sulfate (CuSO₄ 5H₂O) according to GOST 4165 or copper sulfate according to GOST 19347.

Sulfuric acid according to GOST 4204 with a density of 1.83 g/ ^cm3 , analytical grade or chemically pure.

Nitric acid according to GOST 4461 with a density of 1.40 g/ ^cm3 , analytical grade or chemically pure solution with a mass fraction of 20 to 30%.

Distilled water (pH, content of chlorides, nitrates and residue after evaporation according to GOST 6709).

Copper in the form of shavings according to GOST 859.

B.4 Test solution: copper sulfate weighing (130.0±0.1) g is added to water with a volume of (1000±3) ^cm3 , and then sulfuric acid with a volume of (120±3) ^cm3 is added in small portions.

B.5 Solution for repeat testing: copper sulfate weighing from 110 to 160 g is added to water with a volume of (1000±3) ^cm3 , and then sulfuric acid with a volume of (100±3) ^cm3 is added in small portions.

B.6 Conducting the test