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冷拔或冷轧精密无缝钢管
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GBT 3639-2021
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标准编号: GB/T 3639-2021 (GB/T3639-2021)
中文名称: 冷拔或冷轧精密无缝钢管
英文名称: Seamless cold-drawn or cold-rolled steel tubes for precision applications
行业: 国家标准 (推荐)
中标分类: H48
国际标准分类: 77.140.75
字数估计: 14,134
发布日期: 2021-08-20
实施日期: 2022-03-01
旧标准 (被替代): GB/T 3639-2009
起草单位: 江苏迪欧姆股份有限公司、江苏立万精密制管有限公司、浙江伦宝金属管业有限公司、江苏华程工业制管股份有限公司、宝山钢铁股份有限公司、盛德鑫泰新材料股份有限公司、长沙大力神液压工程有限公司、江苏宏亿钢管有限公司、河北金奥精工技术有限公司、冶金工业信息标准研究院
归口单位: 全国钢标准化技术委员会(SAC/TC 183)
提出机构: 中国钢铁工业协会
发布机构: 国家市场监督管理总局、国家标准化管理委员会
GB/T 3639-2021: 冷拔或冷轧精密无缝钢管
GB/T 3639-2021 英文名称: Seamless cold-drawn or cold-rolled steel tubes for precision applications
1 范围
本文件规定了冷拔或冷轧精密无缝钢管的分类、代号、订货内容、尺寸、外形、重量及允许偏差、技术要求、试验方法、检验规则、包装、标志和质量证明书。
本文件适用于制造机械结构、液压设备、汽车零部件用,具有特殊尺寸精度和高表面质量要求的冷拔或冷轧精密无缝钢管(以下简称钢管)。
2 规范性引用文件
下列文件中的内容通过文中的规范性引用而构成本文件必不可少的条款。其中,注日期的引用文
件,仅该日期对应的版本适用于本文件;不注日期的引用文件,其最新版本(包括所有的修改单)适用于本文件。
GB/T 222 钢的成品化学成分允许偏差
GB/T 223.5 钢铁 酸溶硅和全硅含量的测定 还原型硅钼酸盐分光光度法
GB/T 223.9 钢铁及合金 铝含量的测定 铬天青S分光光度法
GB/T 223.12钢铁及合金化学分析方法 碳酸钠分离-二苯碳酰二肼光度法测定铬量
GB/T 223.23 钢铁及合金 镍含量的测定 丁二酮肟分光光度法
GB/T 223.26 钢铁及合金 钼含量的测定 硫氰酸盐分光光度法
GB/T 223.37 钢铁及合金 氮含量的测定 蒸馏分离靛酚蓝分光光度法
GB/T 223.53 钢铁及合金化学分析方法 火焰原子吸收分光光度法测定铜量
GB/T 223.59 钢铁及合金 磷含量的测定 铋磷钼蓝分光光度法和锑磷钼蓝分光光度法
GB/T 223.63 钢铁及合金化学分析方法 高碘酸钠(钾)光度法测定锰量
GB/T 223.85 钢铁及合金 硫含量的测定 感应炉燃烧后红外吸收法
GB/T 223.86 钢铁及合金 总碳含量的测定 感应炉燃烧后红外吸收法
GB/T 228.1 金属材料 拉伸试验 第1部分:室温试验方法
GB/T 242 金属管 扩口试验方法
GB/T 246 金属材料 管 压扁试验方法
GB/T 699 优质碳素结构钢
GB/T 1031 产品几何技术规范(GPS) 表面结构 轮廓法 表面粗糙度参数及其数值
GB/T 1591 低合金高强度结构钢
GB/T 2102 钢管的验收、包装、标志和质量证明书
GB/T 2975 钢及钢产品 力学性能试验取样位置及试样制备
GB/T 3077 合金结构钢
GB/T 4336 碳素钢和中低合金钢 多元素含量的测定 火花放电原子发射光谱法(常规法)
GB/T 5777-2019 无缝和焊接(埋弧焊除外)钢管纵向和/或横向缺欠的全圆周自动超声检测
GB/T 7735-2016 无缝和焊接(埋弧焊除外)钢管缺欠的自动涡流检测
GB/T 12606-2016 无缝和焊接(埋弧焊除外)铁磁性钢管纵向和/或横向缺欠的全圆周自动漏磁
检测
GB/T 17395 无缝钢管尺寸、外形、重量及允许偏差
GB/T 20066 钢和铁 化学成分测定用试样的取样和制样方法
GB/T 20123 钢铁 总碳硫含量的测定 高频感应炉燃烧后红外吸收法(常规方法)
GB/T 20124 钢铁 氮含量的测定 惰性气体熔融热导法(常规方法)
GB/T 20125 低合金钢 多元素含量的测定 电感耦合等离子体原子发射光谱法
GB/T 30062 钢管术语
GB/T 40080 钢管无损检测 用于确认无缝和焊接钢管(埋弧焊除外)水压密实性的自动电磁检
测方法
3 术语和定义
GB/T 30062界定的术语和定义适用于本文件。
4 分类与代号
钢管按交货状态分类和代号如下:
a) 冷加工/硬状态:+C;
b) 冷加工/软状态:+LC;
c) 消除应力退火状态:+SR;
d) 退火状态:+A;
e) 正火状态:+N。
5 订货内容
按本文件订购钢管的合同或订单应包括下列内容:
a) 本文件编号;
b) 产品名称;
c) 钢的牌号;
d) 尺寸规格;
e) 订购的数量(总重量或总长度);
f) 交货状态;
g) 特殊要求。
6 尺寸、外形、重量及允许偏差
6.1 尺寸
6.1.1 钢管通常以公称外径(D)和公称壁厚(S)交货。根据需方要求,经供需双方协商,钢管也可以公
称外径和公称内径(d)或公称内径和公称壁厚交货。
6.1.2 钢管的尺寸应符合表1的规定。
6.1.3 冷加工(+C、+LC)状态交货的钢管,其公称外径和公称内径的允许偏差应符合表1的规定。
6.1.4 钢管壁厚的允许偏差为±10%S或±0.10mm(取其较大者)。
6.1.5 根据需方要求,经供需双方协商,并在合同中注明,可供表1、表2规定以外尺寸和/或允许偏差的钢管。
6.2 长度
6.2.1 通常长度
钢管的通常长度为3000mm~12000mm。经供需双方协商,并在合同中注明,可交付长度短于
3000mm但不短于2000mm的钢管,其数量应不超过该批交货总数量的5%。
6.2.2 定尺和倍尺长度
6.2.2.1 根据需方要求,经供需双方协商,并在合同中注明,钢管可按定尺或倍尺长度交货。钢管的定尺和倍尺总长度应在通常长度范围内。定尺长度允许偏差应符合以下规定:
a) 长度不大于5000mm,为+5 0mm;
b) 长度大于5000mm,为+10 0 mm。
6.2.2.2 倍尺长度交货的钢管,每个切口余量应符合以下规定:
a) 外径不大于159mm:为5mm~10mm;
b) 外径大于159mm:为10mm~15mm。
6.3 弯曲度
6.3.2 外径大于16mm的钢管,其全长(L)弯曲度应符合以下规定:
a) 规定(或计算,适用于+C、+LC、+A状态交货时)最小上屈服强度ReH≤500MPa,不大于
0.15%L;
b) 规定(或计算,适用于+C、+LC、+A状态交货时)最小上屈服强度ReH >500MPa,不大于
0.2%L。
6.3.3 根据需方要求,经供需双方协商,并在合同中注明,钢管的每米弯曲度和全长弯曲度可采用其他规定。
6.4 端头外形
钢管两端端面应与钢管轴线垂直,切口毛刺应予清除。
6.5 不圆度和壁厚不均
6.6 重量
钢管按实际重量交货,亦可按理论重量交货。钢管的每米理论重量按GB/T 17395的规定(钢的密
度为7.85kg/dm3)计算。
7 技术要求
7.1 钢的牌号和化学成分
7.1.1 钢的牌号和化学成分(熔炼分析)应分别符合GB/T 699中10、20、35、45、25Mn,GB/T 1591中Q355B、Q420B和GB/T 3077中25CrMo、42CrMo的规定,其中P、S含量均应不大于0.025%。
7.1.2 当需方要求做成品分析时,应在合同中注明。成品钢管的化学成分允许偏差应符合GB/T 222的规定。
7.1.3 根据需方要求,经供需双方协商,可供应其他牌号的钢管。
7.2 制造方法
钢应采用电弧炉加炉外精炼或氧气转炉加炉外精炼方法冶炼。
GB/T 3639-2021
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
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
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
GB/T 12606-2016 Automated full peripheral flux leakage testing of seamless
and welded (except submerged arc-welded) ferromagnetic steel tubes for
the detection of longitudinal and/or transverse imperfections
GB/T 17395 Dimensions, shapes, masses and tolerances of seamless steel
tubes
GB/T 20066 Steel and iron - Sampling and preparation of samples for the
determination of chemical composition
GB/T 20123 Steel and iron - Determination of total carbon and sulfur content
Infrared absorption method after combustion in an induction furnace (routine
method)
GB/T 20124 Steel and iron - Determination of nitrogen content - Thermal
conductimetric method after fusion in a current of inert gas
GB/T 20125 Low-alloy steel - Determination of multi-element contents -
GB/T 30062 Terminology of steel tubes and tubes
GB/T 40080 Nondestructive testing of steel tubes - Automated
electromagnetic testing of seamless and welded (except submerged arc-
welded) steel tubes for the verification of hydraulic leak tightness
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
a) Cold working/hard state: +C;
b) Cold working/soft state: +LC;
c) Stress relief annealing state: +SR;
d) Annealing state: +A;
e) Normalizing state: +N.
5 Order content
The contract or order, for ordering steel tubes, according to this document, shall
include the following:
a) Number of this document;
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
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.
mm/m.
6.3.2 For steel tubes, which have an outer diameter greater than 16 mm, the
curvature along the total length (L) shall meet the following requirements:
a) When the minimum upper yield strength ReH ≤ 500 MPa is specified (or
calculated, applicable to delivery in +C, +LC, +A states): It is not more than
0.15%L;
b) When the minimum upper yield strength ReH > 500 MPa is specified (or
calculated, applicable to delivery in +C, +LC, and +A states): It is not more
than 0.2%L.
supplier and the buyer, as indicated in the contract, other requirements may be
adopted, for the curvature per meter and full length of the steel tube.
6.4 End shape
The end faces of both ends of the steel tube shall be perpendicular to the axis
of the steel tube. The cut burrs shall be removed.
6.5 Out-of-roundness and uneven wall thickness
The out-of-roundness and uneven wall thickness of the steel tube shall not
exceed 80% of the outer diameter tolerance AND wall thickness tolerance,
respectively.
Steel tubes are delivered, according to actual weight or theoretical weight. The
theoretical weight per meter of steel tube is calculated according to GB/T 17395
(the density of steel is 7.85 kg/dm3).
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%.
specified in the contract. The allowable deviation of the chemical composition
of the finished steel tube shall meet the requirements of GB/T 222.
D - The nominal outer diameter of the steel tube, in millimeters (mm).
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
5. After the test, the specimen shall not show cracks.
Table 5 -- Outer diameter flaring rate of steel tube's flaring test
7.6 Compactness
According to the requirements of the buyer, after negotiation between the
supplier and the buyer, as indicated in the contract, the steel tube can be subject
to the compactness test, in accordance with the provisions of GB/T 40080.
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:
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
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,
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.
7.9 Non-destructive testing
According to the requirements of the buyer, after negotiation between the
supplier and the buyer, as indicated in the contract, the steel tube can be
eddy current testing, the acceptance level shall meet the requirements of E4H
or E4 in GB/T 7735-2016. During magnetic flux leakage testing, the acceptance
level shall meet the requirements of F4 in GB/T 12606-2016. During ultrasonic
testing, the acceptance level shall meet the requirements of U4 in GB/T 5777-
2019.
8 Inspection and test methods
8.1 Sampling of steel tubes for chemical composition analysis shall comply with
the rules of GB/T 20066. The chemical composition analysis usually complies
with the provisions of GB/T 4336, GB/T 20123, GB/T 20124, GB/T 20125 or
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