GB/T 3639-2021 PDF English
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| GB/T 3639-2021 | English | 245 |
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Seamless cold-drawn or cold-rolled steel tubes for precision applications
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| GB/T 3639-2009 | English | 85 |
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Seamless cold-drawn or cold-rolled steel tubes for precision applications
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| GB/T 3639-2000 | English | 399 |
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Cold-drawn or cold-rolled precision seamless steel tubes
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GB/T 3639-2021: Seamless cold-drawn or cold-rolled steel tubes for precision applications---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT3639-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.75
CCS H 48
Replacing GB/T 3639-2009
Seamless cold-drawn or cold-rolled steel tubes for
precision applications
Issued on: AUGUST 20, 2021
Implemented on: MARCH 01, 2022
Issued by. State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 7
4 Classification and code... 7
5 Order content... 8
6 Dimension, shape, weight, allowable deviation... 8
7 Technical requirements... 12
8 Inspection and test methods... 16
9 Inspection rules... 17
10 Packaging, marking, quality certificate... 18
Foreword
This document was drafted in accordance with GB/T 1.1-2020 "Directives for
standardization - Part 1.Rules for the structure and drafting of standardizing
documents".
This document replaces GB/T 3639-2009 "Seamless cold-drawn or cold-rolled
steel tubes for precision applications". Compared with GB/T 3639-2009, in
addition to structural adjustments and editorial changes, the main technical
changes are as follows.
a) MODIFY the normative references (see Chapter 2; Chapter 2 of the 2009
edition);
b) DELETE the manufacturing method in the order content (see Chapter 4
of the 2009 edition);
c) MODIFY the size specifications (see Table 1; Table 1 of the 2009 edition);
d) MODIFY the ordinary length range (see 6.2.1; 5.2.1 of the 2009 edition);
e) MODIFY the requirement for curvature per meter (see 6.3.1; 5.3.1 of the
2009 edition);
f) MODIFY the requirements for uneven wall thickness (see 6.5; 5.5.2 of the
2009 edition);
g) DELETE the allowable deviation requirement for weight (see 5.6 of the
2009 edition);
h) MODIFY the steel designation from Q345B to Q355B. ADD the steel
designations 25Mn, Q420B, 25CrMo, 42CrMo, as well as their chemical
composition and mechanical performance requirements (see 7.1.1, 7.4;
6.1.1, 6.4 of the 2009 edition);
i) MODIFY the smelting method of steel (see 7.2.1; 6.2.1 of the 2009 edition);
j) MODIFY the requirements for compactness inspection (see 7.6; 6.6 of the
2009 edition);
k) MODIFY the surface roughness requirements (see 7.7; 6.7 of the 2009
edition);
l) ADD the non-destructive testing requirements (see 7.9);
m) ADD the surface anti-rust requirements (see 10.1);
n) DELETE the Appendix A, Appendix B, Appendix C, Appendix D (see
Appendix A, Appendix B, Appendix C, Appendix D of the 2009 edition).
Please note that some of the contents of this document may involve patents.
The issuing agency of this document is not responsible for identifying patents.
This document was proposed by the China Iron and Steel Association.
This document shall be under the jurisdiction of the National Steel
Standardization Technical Committee (SAC/TC 183).
Drafting organizations of this standard. Jiangsu Diom Co., Ltd., Jiangsu Liwan
Precision Pipe Co., Ltd., Zhejiang Lunbao Metal Pipe Co., Ltd., Jiangsu
Huacheng Industrial Pipe Co., Ltd., Baoshan Iron and Steel Co., Ltd., Shengde
Xintai New Materials Co., Ltd., Changsha Hercules Hydraulic Engineering Co.,
Ltd., Jiangsu Hongyi Steel tube Co., Ltd., Hebei Jinao Precision Technology
Co., Ltd., Metallurgical Industry Information Standards Research Institute.
The main drafters of this document. Zhou Renjie, Bao Yongli, Yu Zhenglong, Ni
Zhihong, Zheng Zhongcai, Han Bo, Liu Wenhao, Zhou Wenqing, Jiang
Weihong, Ni Song, Cheng Jinyong, Yu Jiaheng, Feng Guangti, Zhou Jinmiao,
Wang Xiaobing, Chen Qi, Zhang Yanjun, Li Qi.
This document was first published in 1983; revised for the first time in 2000;
revised for the second time in 2009.This is the third revision.
Seamless cold-drawn or cold-rolled steel tubes for
precision applications
1 Scope
This document specifies the classification, code, order content, size, shape,
weight, tolerance, technical requirements, test methods, inspection rules,
packaging, markings, quality certificates of seamless cold-drawn or cold-rolled
steel tubes for precision applications.
This document is applicable to seamless cold-drawn or cold-rolled steel tubes
for precision applications (hereinafter referred to as steel tubes), which have
special dimensional accuracy and high surface quality requirements, for the
manufacture of mechanical structures, hydraulic equipment, automobile parts.
2 Normative references
The contents of the following documents constitute the indispensable clauses
of this document through normative references in the text. Among them, for
dated reference documents, only the version corresponding to that date is
applicable to this document; for undated reference documents, the latest
version (including all amendments) is applicable to this document.
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 223.5 Steel and iron - Determination of acid-soluble silicon and total
silicon content - Reduced molybdosilicate spectrophotometric method
GB/T 223.9 Iron steel and alloy - Determination of aluminium content -
Chrome azurol S photometric method
GB/T 223.12 Methods for chemical analysis of iron, steel and alloy - The
sodium carbonate separation-diphenyl carbazide photometric method for the
determination of chromium content
GB/T 223.23 Iron, steel and alloy - Determination of nickel content - The
dimethylglyoxime spectrophotometric method
GB/T 223.26 Iron, steel and alloy - Determination of molybdenum content -
The thiocyanate spectrophotometric method
GB/T 223.37 Iron, steel and alloy - Determination of nitrogen content -
Indophenol blue spectrophotometric method after distillation separation
GB/T 223.53 Methods for chemical analysis of iron, steel and alloy - The
flame atomic absorption spectrophotometric method for the determination of
copper content
GB/T 223.59 Iron, steel and alloy - Determination of phosphorus content -
Bismuth phosphomolybdate blue spectrophotometric method and antimony
phosphomolybdate blue spectrophotometric method
GB/T 223.63 Methods for chemical analysis of iron, steel and alloy - The
sodium (potassium) periodate photometric method for the determination of
manganese content
GB/T 223.85 Steel and iron - Determination of sulfur content - Infrared
absorption method after combustion in an induction furnace
GB/T 223.86 Steel and iron - Determination of total carbon content - Infrared
absorption method after combustion in an induction furnace
GB/T 228.1 Metallic materials - Tensile testing - Part 1.Method of test at
room temperature
GB/T 242 Metal materials - Tube - Drift-expending test
GB/T 246 Metal materials - Tube - Flattening test
GB/T 699 Quality carbon structural steels
GB/T 1031 Geometrical product specifications (GPS) - Surface texture.
Profile method - Surface roughness parameters and their values
GB/T 1591 High strength low alloy structural steels
GB/T 2102 Acceptance packing marking and quality certification of steel tube
GB/T 2975 Steel and steel products - Location and preparation of samples
and test pieces for mechanical testing
GB/T 3077 Alloy structure steels
GB/T 4336 Carbon and low-alloy steel - Determination of multi-element
contents - Spark discharge atomic emission spectrometric method (routine
method)
GB/T 5777-2019 Automated full peripheral ultrasonic testing of seamless
and welded (except submerged arc-welded) steel tubes for the detection of
longitudinal and/or transverse imperfections
GB/T 7735-2016 Automated eddy current testing of seamless and welded
(except submerged arc-welded) steel tubes for detection of imperfections
3 Terms and definitions
The terms and definitions, which are defined in GB/T 30062, apply to this
document.
4 Classification and code
The steel tubes are classified and coded, according to their delivery state, as
follows.
5 Order content
The contract or order, for ordering steel tubes, according to this document, shall
include the following.
a) Number of this document;
b) Product name;
c) Steel designation;
d) Size specifications;
e) The quantity ordered (total weight or total length);
f) Delivery state;
g) Special requirements.
6 Dimension, shape, weight, allowable deviation
6.1 Dimensions
6.1.1 Steel tubes are usually delivered, based on nominal outer diameter (D)
and nominal wall thickness (S). According to the requirements of the buyer AND
after negotiation between the supplier and the buyer, the steel tube can also be
delivered, based on the nominal outer diameter and the nominal inner diameter
(d) OR the nominal inner diameter and the nominal wall thickness.
6.1.2 The dimensions of the steel tube shall meet the requirements of Table 1.
6.1.3 For steel tubes, which are delivered in cold working (+C, +LC) state, the
allowable deviation of the nominal outer diameter and the nominal inner
diameter shall meet the requirements of Table 1.For steel tubes, which are
delivered in the heat treatment (+SR, +A, +N) state, the allowable deviation of
the nominal outer diameter and the nominal inner diameter shall meet the
requirements of Table 2.
6.1.4 The allowable deviation of steel tube's wall thickness is ±10%S or ±0.10
mm (whichever is larger).
6.1.5 According to the requirements of the buyer, after negotiation between the
supplier and the buyer, as indicated in the contract, the steel tubes, which have
dimensions and/or allowable deviations other than those specified in Table 1
and Table 2, are available.
6.2 Length
6.2.1 Ordinary length
The ordinary length of steel tube is 3000 mm ~ 12000 mm. After negotiation
between the supplier and the buyer AND indicated in the contract, it may deliver
the steel tubes, which have a length shorter than 3000 mm but not shorter than
2000 mm; the quantity of steel tubes shall not exceed 5% of the total quantity
of the batch.
6.2.2 Fixed length and multiple length
6.2.2.1 According to the request of the buyer, after negotiation between the
supplier and the buyer, as indicated in the contract, the steel tube can be
delivered according to the fixed length or the multiple length. The total length of
the fixed-length and multiple-length of the steel tube shall be within the ordinary
length range. The allowable deviation of the fixed length shall meet the following
requirements.
a) When the length is not more than 5000 mm, it is ;
b) When the length is greater than 5000 mm, it is.
6.2.2.2 For steel tubes, which are delivered in multiple length, the margin of
each cut shall meet the following requirements.
a) When the outer diameter is not more than 159 mm. it is 5 mm ~ 10 mm;
b) When the outer diameter is more than 159 mm. it is 10 mm ~ 15 mm.
6.3 Curvature
6.3.1 The curvature per meter of the steel tube shall not be greater than 1.5
mm/m.
7 Technical requirements
7.1 Steel designation and chemical composition
7.1.1 The designation and chemical composition (melting analysis) of the steel
shall meet the requirements of 10, 20, 35, 45, 25Mn in GB/T 699; the Q355B,
Q420B in GB/T 1591; the 25CrMo and 42CrMo in GB/T 3077, where P, S
content shall not be greater than 0.025%.
7.1.2 When the purchaser requires a finished product analysis, it shall be
specified in the contract. The allowable deviation of the chemical composition
of the finished steel tube shall meet the requirements of GB/T 222.
7.1.3 According to the requirements of the buyer AND after negotiation between
the supplier and the buyer, other steel tubes can be supplied.
7.2 Manufacturing method
7.2.1 Steel smelting method
Steel shall be smelted, by electric arc furnace plus out-of-furnace refining OR
oxygen converter plus out-of-furnace refining methods.
7.2.2 Manufacturing method of steel tube
The steel tube shall be manufactured by cold drawn or cold rolled seamless
method. When the purchaser specifies a certain method to manufacture steel
tubes, it shall be specified in the contract.
7.3 Delivery state
Steel tubes shall be delivered in one of the states, which are listed in Table 3.
7.4 Mechanical properties
The longitudinal mechanical properties of the steel tube, at room temperature,
in the delivery state, shall meet the requirements of Table 4.
7.5 Process performance
7.5.1 Flattening
According to the requirements of the buyer, after negotiation between the
supplier and the buyer, as indicated in the contract, the steel tubes, which have
a ratio of wall thickness to outer diameter less than 15%, in the designations of
10, 20, Q355B, in the +A and + N states, can be subject to the flattening test.
After the specimen is flattened, the distance H between flat plates, after
flattening, is calculated according to formula (1). After the test, there shall be no
cracks or fractures on the specimen.
7.5.2 Flaring
According to the requirements of the buyer, after negotiation between the
supplier and the buyer, as indicated in the contract, the steel tubes, which have
an outer diameter of not more than 150 mm AND a wall thickness of not more
than 10 mm, in the designations 10, 20, Q355B, in the state of +A and +N, can
be subject to flaring test. The top core taper of the flaring test is 60°. The flaring
rate of the outer diameter of the specimen shall meet the requirements of Table
5.After the test, the specimen shall not show cracks.
7.7 Surface roughness
7.7.1 For steel tubes, which have an outer diameter not greater than 260 mm,
the inner and outer surface roughness Rα shall meet the following requirements.
a) When delivered in +SR, +A, +N states, the outer surface is not more than
4 μm;
b) When delivered in +C and +LC states, the inner and outer surfaces of the
steel tube are not greater than 4 μm; wherein the requirements for the
inner surface are applicable to steel tubes, which have a nominal inner
diameter or a calculated inner diameter of not less than 15 mm.
7.7.2 For steel tubes, which have an outer diameter greater than 260 mm, the
inner and outer surface roughness Rα shall not be greater than 6 μm.
7.7.3 The surface roughness is measured, in the axial direction of the steel tube,
according to the arithmetic mean deviation Rα of the profile, which is specified
in GB/T 1031, AND the recommended sampling length.
Designation
Outer diameter flaring rate/%
7.7.4 According to the requirements of the buyer, after negotiation between the
supplier and the buyer, as indicated in the contract, it may specify other surface
roughness requirements.
7.8 Surface quality
7.8.1 The inner and outer surfaces of steel tubes shall be smooth. The depth of
local pits, scratches, small scratches shall not exceed 0.08 mm. The actual wall
thickness of the steel tube, at these defects, shall not be less than the minimum
allowable wall thickness deviation.
7.8.2 Defects on the inner and outer surfaces of the steel tube can be removed,
by appropriate methods. The actual wall thickness, at the removal location, shall
not be less than the minimum allowable wall thickness deviation.
7.8.3 The inner and outer surfaces of cold-worked steel tubes may have
phosphate and lubricant adhesion layers, which are formed in the
manufacturing process. The inner and outer surfaces of the delivered steel tube,
in the heat-treated condition, may have an oxide film layer, that does not affect
the surface inspection; however, there shall be no loose oxide scale.
8 Inspection and test methods
8.2 The size and shape of steel tubes shall be measured one by one, by the
measuring tools, that meet the accuracy requirements.
8.3 The inner and outer surfaces of steel tubes shall be visually inspected one
by one, under sufficient lighting conditions.
8.4 The test methods and sampling methods, for other inspection items of steel
tubes, shall meet the requirements of Table 6.
9 Inspection rules
9.1 Inspection and acceptance
The inspection and acceptance of steel tubes are carried out, by the supplier’s
quality and technical supervision department.
9.2 Group-batching rules
Steel tubes are inspected and accepted in batches. Each batch shall be
composed of steel tubes of the same designation, the same heat number, the
same specification, the same heat treatment system (heat) or the same delivery
state. The number of steel tubes in each batch shall not exceed 500.
9.3 Sampling quantity
The sampling quantity of each batch of steel tubes shall meet the requirements
of Table 6.
10 Packaging, marking, quality certificate
10.1 For the steel tubes, which are exit-factory in the heat treatment (+SR, +A,
+N) state, the inner and outer surface shall be rust-proofed, usually coated with
neutral oil. When the buyer has special requirements for rust prevention, it shall
be negotiated and determined by the supplier and the buyer.
10.2 The packaging, marking, quality certificate of steel tubes shall meet the
requirements of GB/T 2102.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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