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This standard is drafted in accordance with the rules of GB/T 1.1-2009.
This standard replaces GB/T 8163-2008 Seamless steel tubes for liquid service, and the following main technical changes have been made with respect to GB/T 8163-2008:
—— the tolerances for the outside diameter and wall thickness of cold drawn (rolled) seamless steel pipes are modified (see 4.2.1 and 4.2.3 of this standard, 4.2.1 and 4.2.3 of Edition 2008);
—— the tolerances for the wall thickness of hot expanded steel pipes are modified (see 4.2.2 of this standard and 4.2.2 of Edition 2008);
—— the random length range and the tolerance requirements for cut length of steel pipes are modified (see 4.3.1 and 4.3.3.2 of this standard, 4.3.1 and 4.3.3.2 of Edition 2008);
—— the steel grade Q295 and its relevant technical requirements are deleted (see 5.1.1 of Edition 2008);
—— the chemical composition and carbon equivalent table of each grade high strength low alloy structural steels are added (see 5.1.3);
—— the chemical composition table for steel of Grades 10 and 20 is added (see 5.1.2);
—— the manufacturing method for extruded steel pipes is deleted (see 5.2.3 of Edition 2008);
—— the requirement is deleted that the yield strength of each grade of steel pipe is graded according to the wall thickness of the pipe (see 5.4.1 of Edition 2008);
—— the requirements for flattening test on steel of Grade Q390 are added (see 5.5.1);
—— the requirement is deleted that the hydraulic test may be replaced by ultrasonic testing (see 5.5.4 of Edition 2008);
—— negotiation clauses for ultrasonic non-destructive testing of steel pipe are added;
—— the galvanized coating and related technical requirements are added (see 5.9 and Annex A).
This standard was proposed by the China Iron and Steel Association.
This standard is under the jurisdiction of the National Technical Committee on Iron and Steel of Standardization Administration of China (SAC/TC 183).
The previous editions of this standard are as follows:
—— GB/T 8163-1987, GB/T 8163-1999, and GB/T 8163-2008.
Seamless steel pipes for liquid service
1 Scope
This standard specifies the order contents, dimensions, shapes, weights, technical requirements, test methods, inspection rules, and packing, marking and quality certificate of seamless steel pipes for liquid service.
This standard is applicable to seamless steel pipes for common fluid service.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
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 aluminum content - Chrome azurol S photometric method
GB/T 223.11 Iron steel and alloy - Determination of chromium content - Visual titration or potentiometric titration 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 223.14 Methods for chemical analysis of iron, steel and alloy - The N-benzoy-N-phenylhydroxylamine extraction photometric method for the determination of vanadium content
GB/T 223.19 Methods for chemical analysis of iron,steel and alloy - The neocuproine-chloroform extraction photometric method for the determination of copper 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 Methods for chemical analysis of iron, steel and alloy - The indophenol blue photometric methods for the determination of nitrogen content after distillation separation
GB/T 223.40 Iron, steel and alloy - Determination of niobium content by the sulphochlorophenol S spectrophotometric method
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 223.68 Methods for chemical analysis of iron, steel and alloy - The potassium iodate titration method after combustion in the pipe furnace for the determination of sulfur content
GB/T 223.81 Iron,steel and alloy - Determination of total aluminum and total aluminum and total boron contents - Microwave digestion-inductively coupled plasma mass spectrometric method
GB/T 223.84 Steel, iron and alloy - Determination of titanium content - Diantipyrylmethane spectrophotometric method
GB/T 223.86 Steel, iron and alloy - 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 229 Metallic materials - Charpy pendulum impact test method
GB/T 241 Metal materials - Tube - Hydrostatic pressure testing
GB/T 242 Metallic materials - Tube - Drift expanding test
GB/T 244 Metallic materials - Tube - Bend test
GB/T 246 Metallic materials - Tube - Flattening test
GB/T 2102 Acceptance, packing, marking and quality certification of steel pipe
GB/T 2975 Steel and steel products - Location and preparation of samples and test pieces for mechanical testing
GB/T 4336 Carbon and low-alloy steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method)
GB/T 5777-2008 Seamless steel pipe and tubing methods for ultrasonic testing
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 (routine method)
YB/T 4149 Continuously cast round billet for seamless steel tube rolling
YB/T 5222 Quality hot rolled and forged carbon structural steel round tube blank
IS0 10893-1 Non-destructive testing of steel tubes - Part 1: Automated electromagnetic testing of seamless and welded (except submerged arc-welded) steel tubes for the verification of hydraulic leak-tightness
3 Order contents
The contract or order for ordering steel pipes according to this standard shall include the following contents:
a) standard No.;
b) product name;
c) the steel grade, and the quality grade (if any);
d) dimension and specification;
e) the order quantity (total weight or total length);
f) delivery state;
g) special requirements.
4 Dimension, shape and weight
4.1 Outside diameter and wall thickness
The nominal outside diameter (D) and nominal wall thickness (S) of steel pipes shall meet the requirements of GB/T 17395. As required by the purchaser, steel pipes with other outside diameter and wall thickness may be supplied upon agreement between the supplier and purchaser.
4.2 Tolerances for outside diameter and wall thickness
4.2.1 The tolerances for outside diameter of steel pipes shall meet those specified in Table 1.
Table 1 Tolerances for outside diameter of steel pipes In: mm
Steel pipe type Tolerance of outside diameter
Hot rolled (expanded) steel pipe ±1% D or ±0.5, whichever is greater
Cold drawn (rolled) steel pipe ±0.75% D or ±0.3, whichever is greater
4.2.2 The tolerances for wall thickness of hot rolled (expanded) steel pipes shall meet those specified in Table 2.
Table 2 Tolerances for wall thickness of hot rolled (expanded) steel pipes In: mm
Steel pipe type Nominal outside diameter D of steel pipe S/D Tolerance of wall thickness
Hot rolled steel pipe ≤102 - ±12.5% S or ±0.4, whichever is greater
>102 ≤0.05 ±15% S or ±0.4, whichever is greater
>0.05~0.10 ±12.5% S or ±0.4, whichever is greater
>0.10 ±12.5% S
-10% S
Hot expanded steel pipe - +17.5% S
-12.5% S
4.2.3 The tolerances for wall thickness of cold drawn (rolled) steel pipes shall meet those specified in Table 3.
Table 3 Tolerances for wall thickness of cold drawn (rolled) steel pipes In: mm
Steel pipe type Nominal wall thickness S of steel pipe Tolerance
Cold drawn (rolled) ≤3 or ±0.15, whichever is greater
>3~10 ±12.5% S
-10% S
>10 ±10％ S
4.2.4 As required by the purchaser and indicated in the contract upon the agreement between the supplier and the purchaser, steel pipes beyond the dimensional tolerances specified in Tables 1, 2 and 3 may be supplied.
4.3 Length
4.3.1 Random length
The random length of steel pipes is 3,000 mm to 12,000 mm. As required by the purchaser, steel pipes beyond the random length range may be supplied upon agreement between the supplier and purchaser.
4.3.2 Range length
As required by the purchaser and indicated in the contract upon the agreement between the supplier and the purchaser, steel pipes may be delivered in range length.
4.3.3 Cut and multiple lengths
4.3.3.1 As required by the purchaser and indicated in the contract upon the agreement between the supplier and the purchaser, steel pipes may be delivered in cut length or multiple length.
4.3.3.2 Where the steel pipes are delivered in cut length or multiple length, their tolerances for length shall meet the following requirements:
a) if the cut length is not greater than 6,000 mm, the tolerances shall be mm;
b) if the cut length is greater than 6,000mm, the tolerances shall be mm;
4.3.3.3 Upon agreement between the supplier and the purchaser, pipes with other tolerances for cut lengths may also be supplied.
4.3.3.4 If the steel pipes are delivered in multiple length, notch allowance shall be reserved for each multiple length according to following requirements:
a) if D≤159 mm, the notch allowance shall be 5 mm to10 mm;
b) if D>159 mm, the notch allowance shall be 10 mm to 15 mm.
4.3.3.5 Upon agreement between the supplier and the purchaser, steel pipes with other notch allowances may be supplied.
4.4 Curvature
4.4.1 The curvature per meter of steel pipes shall meet those specified in Table 4.
Table 4 Curvature of steel pipes
Nominal wall thickness of steel pipe, S/ mm Curvature per meter/ (mm/m)
≤15 ≤1.5
>15~30 ≤2.0
>30 or D≥351 ≤3.0
4.4.2 The curvature of a steel pipe at full length shall not be greater than 0.15% of the total length of steel pipe.
4.5 Out-of-roundness and wall unevenness
As required by the purchaser and indicated in the contract upon the agreement between the supplier and the purchaser, the out-of-roundness and wall unevenness of steel pipes shall not exceed 80% of the tolerances for nominal outside diameter and nominal wall thickness respectively.
4.6 End shape
4.6.1 For the steel pipes with a nominal outside diameter of not greater than 60 mm, the oblique cutting at pipe end shall not exceed 1.5 mm; for those with a nominal outside diameter of more than 60 mm, the oblique cutting at pipe end shall not exceed 2.5% of the nominal outside diameter of steel pipe but shall not be greater than 6 mm at maximum. The oblique cutting of steel pipes is shown as Figure 1.
Foreword i 1 Scope 2 Normative references 3 Order contents 4 Dimension, shape and weight 4.1 Outside diameter and wall thickness 4.2 Tolerances for outside diameter and wall thickness 4.3 Length 4.4 Curvature 4.5 Out-of-roundness and wall unevenness 4.6 End shape 4.7 Weight 5 Technical requirements 5.1 Grade and chemical composition of steel 5.2 Manufacturing method 5.3 Delivery state 5.4 Mechanical property 5.5 Processing property 5.6 Hydraulic 5.7 Surface quality 5.8 Ultrasonic testing 5.9 Galvanized coating 6 Test methods 7 Inspection rules 7.1 Inspection and acceptance 7.2 Batching rules 7.3 Sampling quantity 7.4 Re-inspection and judgment rules 8 Packing, marking and quality certificate Annex A (Normative) Galvanized coating
表6 Q345、Q390、Q420和Q460钢的化学成分 牌号 质量 等级 化学成分(质量分数)a,b,c/％ 碳当量CEVf,g/ ％ C Si Mn P S Nb V Ti Cr Ni Cu Nd Mo B Alsc 不大于 不小于 不大于 Q345 A 0.20 0.50 1.70 0.035 0.035 — — — 0.30 0.50 0.20 0.012 0.10 — — 0.45 B 0.035 0.035 C 0.030 0.030 0.07 0.15 0.20 0.015 D 0.18 0.030 0.025 E 0.025 0.020 Q390 A 0.20 0.50 1.70 0.035 0.035 0.07 0.20 0.20 0.30 0.50 0.20 0.015 0.10 — — 0.46 B 0.035 0.035 C 0.030 0.030 0.015 D 0.030 0.025 E 0.025 0.020 Q420 A 0.20 0.50 1.70 0.035 0.035 0.07 0.20 0.20 0.30 0.80 0.20 0.015 0.20 — — 0.48 B 0.035 0.035 C 0.030 0.030 0.015 D 0.030 0.025 E 0.025 0.020 Q460 C 0.20 0.60 1.80 0.030 0.030 0.11 0.20 0.20 0.30 0.80 0.20 0.015 0.20 0.005 0.015 0.53 D 0.030 0.025 E 0.025 0.020 a 除Q345A、Q345B牌号外，其余牌号钢中应至少含有细化晶粒元素Al、Nb、V、Ti中的一种。根据需要，供方可添加其中一种或几种细化品粒元素，最大值应符合表中规定。组合加入时，Nb+V+Ti≤0.22％。 b Mo+Cr≤0.30％。 c 各牌号的Cr、Ni作为残余元素时，Cr、Ni含量应各小大于0.30％；当需要加入时，其含量应符合表中规定或由供需双方协商确定。 d 如供方能保证氮元素含量符合表中规定，可不进行氮含量分析。如果钢中加入Al、Nb、V、Ti等具有固氮作用的合金元素，氮元素含量不作限制，固氮元素含量应在质量证明书中注明。 e 当采用全铝时，全铝含量Alt≥0.020％。 f 碳当量(CEV)应由熔炼分析成分并采用CEV＝C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15公式计算。 g 适用于壁厚不大于25 mm的钢管。当钢管壁厚大于25 mm时，由供需双方协商确定。
5.2 制造方法 5.2.1钢的冶炼方法 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。 经供需双方协商，也可采用较高要求的其他方法冶炼。需方指定某种冶炼方法时，应在合同中注明。 5.2.2管坯的制造方法 管坯可采用连铸、模铸或热轧(锻)方法制造。 连铸管坯应符合YB/T 4149的规定；热轧(锻)管坯应符合YB/T 5222的规定；模铸管坯可参照热轧(锻)管坯的规定执行。 5.2.3钢管的制造方法 钢管应采用热轧(扩)或冷拔(轧)无缝方法制造。需方指定某一种方法制造钢管时，应在合同中注明。 5.3 交货状态 5.3.1 热轧(扩)钢管可以热轧(扩)状态或热处理状态交货。需方要求热处理状态交货时，应在合同中注明。 5.3.2冷拔(轧)钢管应以退火或高温回火状态交货。根据需方要求，经供需双方协商，并在合同中注明，冷拔(轧)钢管可以冷拔(轧)或其他热处理状态交货。 5.4力学性能 5.4.1拉伸性能 交货状态钢管的纵向拉伸性能应符合表7的规定。 表7钢管的力学性能 牌号 质量 等级 拉伸性能 冲击试验 抗拉强度Rm MPa 下屈服强度aReL MPa 不小于 断后伸长率A ％ 不小于 试验温度 ℃ 吸收能量KV2 J 不小于 10 — 335～475 205 24 — — 20 — 410～530 245 20 — — Q345 A 470～630 345 20 — — B +20 34 C 21 0 D -20 E -40 27 Q390 A 490～650 390 18 — — B +20 34 C 19 0 D -20 E -40 27 Q420 A 520～680 420 18 — — B +20 34 C 19 0 D -20 E -40 27 Q460 C 550～720 460 17 0 34 D -20 E -40 27 a拉伸试验时，如不能测定ReL，可测定Rp0.2代替ReL。
