GB T 14976-2012 English Version 英文版

ICS 77.140.75 H 48 National Standard of the People’s Republic of China GB/T 14976-2012 Substitution of GB/T 14976-2002 Seamless Stainless Steel Pipes for Fluid Transport Issued on May 11th, 2012 Executed on Feb. 1st, 2013-9-23 Issued by General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China and Standardization Administration of the People’s Republic of China GB/T 14976-2012 Foreword This standard is draft up in accordance with rules of GB/T 1.1-2009. This standard is formulated by reference to ASTM A 269/A 269M-04 Seamless and Welded Stainless Austenite Steel Pipe for General Purpose, ASTM A 312/A 312M-05a Seamless, Welded and Deep Cold Processing Austenite Stainless Steel Pipe and ASTM A 268/A 268M-05a Seamless and Welded Ferrite and Martensite Stainless Steel Pipe for General Purpose. This standard substitutes GB/T 14976-2002 Seamless Stainless Steel Pipes for Fluid Transport. Comparing with GB/T 14976-2002, this standard is revised as follows: · Added delivery method based on minimum wall thickness ; · Modified allowable dimensional deviation of pipes; · Deleted signs example; · Grade and chemical composition of steel is changed in line with GB/T 20878; · Steel grade of and 12Cr13 are added; · Deleted bipolar steel grade and relative content; · Modified requirements on hydraulic test of pipes; · Added informative Appendix A Comparison Table of Grade This standard is proposed by China Iron Association. This standard is centralized by China Steel Standardization Technical Committee (SAC/TC 183). Drafting unit of this standard: Jiangsu Wujin Stainless Steel Pipe Group Co., Ltd. Panggang Group Chengdu Iron & Steel Co., Ltd., Shanxi Taigang Stainless Steel Pipe Co., Ltd., Shanghai Shangshang Stainless Steel Pipe Co., Ltd., Yongxing Special Stainless Steel Co., Ltd. and China Metallurgical Information Standardization Institute. Major drafter of this standard is: Song Jianxin, Zhou Zhibin, Yan Ru, Li Qi, Ji Xuewen, Yang Hui, Wang Jianyong, Chen Zemin and Dongli. Successive versions of the standard substituted by this standard are as follows: · GB/T 14976-1994; · GB/T 14976-2002. GB/T 14976-2012 Seamless Stainless Steel Pipes for Fluid Transport 1. Scope This standard specifies category, symbol, order content, dimension, shape, weight, technical requirements, test method, inspection rules, packing, signs and quality certificate of seamless stainless steel pipes for fluid transport. This standard is applicable for seamless stainless steel pipes (hereinafter referred to as steel pipe) for fluid transport. 2. Normative Reference The following files are necessary for application of this file. For all quoted files noted with date, only versions of noted date are applicable for this file. For all quoted files without noted date, their latest versions shall be appropriate to this file. GB/T 222 Permissible deviations for chemical composition of steel products 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 223.16 Methods for chemical analysis of iron, steel and alloy - The chromotropic acid photometric method for the determination of titanium content GB/T 223.18 Methods for chemical analysis of iron, steel and alloy - The sodium thiosulfate separation iodimetric method for the determination of copper content GB/T 223.25 Methods for chemical analysis of iron, steel and alloy - The dimethylglyoxime gravimetric method for the determination of nickel content GB/T 223.28 Methods for chemical analysis of iron, steel and alloy - The D-denzoinoxime gravimetric method for the determination of molybdenum content GB/T 223.36 Methods for chemical analysis of iron, steel and alloy - The neutral titration method for the determination of nitrogen content after distillation separation GB/T 223.40 Iron, steel and alloy - Detetmination of niobium content - The sulphochlorophenol S spectrophotometric method GB/T 223.60 Methods for chemical analysis of iron, steel and alloy - The perchloric acid dehydration gravimetric method for the determination of silicon content GB/T 223.62 Methods for chemical analysis of iron, steel and alloy - The butyl acetate extraction photometric method for the determination of phosphorus content 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 223.69 Iron, steel and alloy - Determination of carbon contents - Gas-volumetric method after combustion in the pipe furnace GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature GB/T 241 Metal materials – Tube - Hydrostatic pressure test GB/T 242 Metal materials – Tube - Drift-expending test GB/T 246 Metal materials – Tube - Flattening test GB/T 2012 Acceptance, packing, symbols and quality certificate of pipes GB/T 2975 Steel and steel products Location and preparation of test pieces for mechanical testing GB/T 4334-2008 Corrosion of metals and alloys - Test methods for intergranular corrosion of stainless steels GB/T 5777-2008 Seamless steel pipe and tubing methods for ultrasonic testing GB/T 7735-2004 Steel tubes - The inspection method on eddy current test GB/T 11170 Stainless steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method) GB/T 17395 Dimensions, shapes, masses and deviations 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 14976-2012 GB/T 20878  Stainless and heat-resisting steels - Designation and chemical composition 3. Category and Symbol 3.1 Steel pipes can be divided into two categories according to processing method of products and category and symbol separately are: — Hot rolled (extruded, expanded) steel pipe W-H; — Cold drawn (rolled) steel pipe W-C. 3.2 Steel pipes can be divided into two grades based on dimensional accuracy and grade and symbol separately are: — Ordinary grade PA; — Advanced grade PC. 3.3 The following symbols are applicable for this standard: — D outer diameter or nominal outer diameter; — S wall thickness or nominal wall thickness; — Smin minimum wall thickness. 4. Order Content Contract or order, orders steel pipes, pursuant to this standard should include but not limited to the following content: a) No. of standard: b) Product name; c) Steel grade; d) Dimensions; e) Ordered quantity (total weight or total length); f) Delivery state; g) Selective requirements; h) Other special requirements. 5. Dimension, Shape and Weight 5.1 Outer Diameter and Wall Thickness 5.1.1 Delivery of steel pipes should be based on nominal outer diameter and nominal wall thickness. According to requirements of the purchaser, delivery of steel pipes can be performed on the basis of nominal outer diameter and nominal wall thickness or other dimensions after negotiation between a supplier and a purchaser. 5.1.2 Outer diameter and wall thickness of steel pipes should be in line with relevant regulations of GB/T 17395. According to requirements of the purchaser, steel pipes of other dimensions out of specified scope of GB/T 17395 can be supplied after negotiation between a supplier and a purchaser. 5.1.3 When steel pipes are delivered based on nominal outer diameter and nominal wall thickness, permissible deviation of nominal outer diameter and nominal wall thickness should be in accordance with regulations of Table 1. When steel pipes are delivered based on nominal outer diameter and minimum wall thickness, permissible deviation of nominal outer diameter should be in accordance with Table 1, while permissible deviation of wall thickness should be in compliance with regulations Table 2. 5.1.4 When a purchaser does not indicate permissible deviation level of steel pipe dimensions in contract, permissible deviation of outer diameter and wall thickness of steel pipes should in conformity with rules of ordinary grade dimension accuracy. When a purchaser requires advanced dimension accuracy, it should be indicated in the contract. 5.1.5 According to requirements of the purchaser, steel pipe, allowable dimensions deviation of which is out of scope of Table 1 and Table 2, can be supplied after negotiation between a supplier and a purchaser and being indicated in contract. GB/T 14976-2012 Table 1 Permissible Deviation of Outer Diameter and Wall Thickness Unit: mm Hot Rolled (Extruded, Expanded) Steel Pipe Cold Drawn (Rolled) Steel Pipe Dimension permissible deviation Dimension permissible deviation Ordinary grade PA Advanced grade PC Ordinary grade PA Advanced grade PC Nominal Outer Diameter 68~159 ±1.25%D ±1%D Nominal Outer Diameter D 6~10 ±0.20 ±0.15 >10~30 ±0.30 ±0.20 >30~50 ±0.40 ±0.30 >159 ±1.5%D >50~219 ±0.85%D ±0.75%D >219 ±0.9%D ±0.8%D Nominal Wall Thickness <15 +15%S -12.5%S ±12.5%S Nominal Wall Thickness S ≤3 ±12%S ±10%S ≥15 +20%S -15%S >3 +12.5%S -10%S ±10%S Table 1 Permissible Deviation of Minimum Wall Thickness Unit: mm Manufacturing Method Dimension Permissible Deviation Ordinary grade PA Advanced grade PC Hot Rolled (Extruded, Expanded) Steel Pipe W-H Smin < 15 +25%Smin 0 +22.5%Smin 0 Smin ≥ 15 +32.5%Smin 0 Cold Drawn (Rolled) Steel Pipe W-C All wall thickness +22%S 0 +20%S 0 5.2 Length 5.2.1 Normal Length Normal length of steel pipes should be in line with the following rules: — Hot rolled (extruded, expanded) steel pipe, 2 000 mm ~ 12 000 mm; — Cold drawn (rolled) steel pipe, 1 000 mm ~ 12 000 mm; 5.2.2 Specified Length and Multiple Length According to requirements of the purchaser, delivery of steel pipes can be based on specified length and multiple length after negotiation between a supplier and a purchaser and being indicated in contract. Specified length and multiple length should within the scope of normal length. Permissible deviation of total length should be mm and incision margin should be left for each multiple length according to the following rules: — Outer diameter ≤ 159 mm, 5 mm ~10 mm; — Outer diameter > 159 mm, 10 mm ~15 mm; 5.2.3 For steel pipes with special specification, e.g. steel pipes of extremely thin wall, whose wall thickness is no more than 3% outer diameter and small diameter steel pipe with outer diameter of no more than 30 mm, etc., length deviation of this kind of pipes can be determined through additional negotiation between a supplier and a purchaser. GB/T 14976-2012 5.3 Curvature 5.3.1 Curvature of Total Length Total length curvature of a Steep pipe should not be over 0.15% of its total length. 5.3.2 Curvature of Each Meter Each meter curvature of a Steep pipe should follow the following rules: — wall thickness ≤ 15mm, 1.5mm/m; — wall thickness > 15mm, 2.0mm/m; — hot expanded Steep pipe, 3.0 mm/m. 5.4 Shape of Ends End face of a steel pipe’ s both sides should be perpendicular to axis of a steel pipe. And burrs on incisions should be removed. 5.5 Non-circularity and Wall Unevenness According to requirements of the purchaser, non-circularity and wall unevenness of steel pipes should separately not exceed tolerance of outer diameter and 80% of tolerance of wall thickness after negotiation between a supplier and a purchaser and being indicated in contract. 5.6 Weight 5.6.1 Delivery of steel pipes should be based on actual weight. 5.6.2 According to requirements of the purchaser, if it is indicated in contract, delivery of steel pipes can be conducted according theoretical weight. Theoretical weight of each meter pipe should be calculated on the basis of formula (1): …………………(1) Of which: W — theoretical weight of pipe and its unit is kg/m; π— 3.1416; ρ— density of pipe and its unit is kg/dm3. For thickness of steel pipes, see Table 4; S — nominal wall thickness of pipe and its unit is mm; D — nominal outer diameter of pipe and its unit is mm; For pipes to be delivery according to nominal outer diameter and nominal wall thickness, theoretical weight should be calculated based on average wall thickness. And its average wall thickness is average value of maximum and minimum wall thickness that is calculated based on wall thickness and its permissible deviation. When steel pipes are delivered on the basis of theoretical weight, a supplier and a purchaser can negotiate permissible deviation of weight and indicate it in the contract. 6. Technical Requirements 6.1 Grade and Chemical Composition of Steel 6.1.1 Grade and chemical composition of steel should in accordance with Table 3. Acceptance of steel pipes shall be according to smelting composition. According to requirements of the purchaser, steel pipes, whose grade and chemical composition is out of scope of Table 3, but in conformity with GB/T 20878, can be supplied after negotiation between a supplier and a purchaser and being indicated in contract. 6.1.2 If a purchaser requires product analysis, it should be indicated in contract. Permissible chemical composition deviation of finished steel pipes should be in keeping with GB/T 222. GB/T 14976-2012 6.2 Manufacturing Method 6.2.1 Smelting Process of Steel Steel should be smelted by adopting the process of crude smelting water plus secondary refining. Other smelting process can also be applied through negotiation between a supplier and a purchaser. 6.2.2 Manufacturing Method of Steel pipes Steel pipes should be manufactured by adopting hot rolled (extruded, expanded) or cold drawn (rolled) seamless approach. Hot expanded steel pipes should refer to pipes with larger diameter, which are formed by expansion after overall heating of blank steel pipes. When one manufacturing method is designated by a purchaser, it should be indicated in contract. 6.3 Delivery State 6.3.1 Steel pipes should be delivered after heat treatment and pickling. All Steel pipes, which are overall grinded, bored or treated by heat treatment in protective gases, can be delivered without pickling. For recommend heat treatment system of finished steel pipes, see Table 4. 6.3.2 If direct water cooling or other fast cooling is conducted to austenite hot extruded pipes after thermal deformation within scope of heat treatment temperature specified in Table 4, it should be deemed that pipes are in compliance with requirements on heat treatment of steel pipes. 6.3.3 According to requirements of the purchaser, austenite cold drawn (rolled) can be delivered under cold processing state after negotiation between a supplier and a purchaser and being indicated in contract. 6.3.4 It is negotiated and agreed by a supplier and a purchaser and indicated in contract that other heat treatment systems out of scope of Table 4 can be employed to steel pipes. 6.4 Mechanical Property 6.4.1 Longitudinal mechanical property (tensile strength Rm and percentage elongation after fracture A) of steel pipes under heat treatment state should be in line with Table 4. 6.4.2 According to requirements of the purchaser, non-proportional elongation strength RP0.2 of steel pipes can be inspected and inspection results should be in accordance with Table 4 after negotiation between a supplier and a purchaser and being indicated in contract. GB/T 14976-2012 Table 3 Grade and Chemical Composition Structure Type No GB/T 20878 Grade Chemical Composition (Mass Fraction) a/% No Unified Code Number C Si Mn P S Ni Cr Mo Cu N Other Austenite 1 13 S30210 12Cr18Ni9 0.15 1.00 2.00 0.035 0.30 8.00~10.00 17.00~19.00 _ _ 0.10 2 17 S30408 06Cr19Nil0 0.08 1.00 2.00 0.035 0.30 8.00~11.00 18.00~20.00 _ _ _ 3 18 S30403 022Cr19Nil0 0.030 1.00 2.00 0.035 0.30 8.00~12.00 18.00~20.00 _ _ _ _ 4 23 S30458 06Cr19Nil0N 0.08 1.00 2.00 0.035 0.30 8.00~11.00 18.00~20.00 _ _ 0.10~0.16 _ 5 24 S30478 06Cr19Ni9NbN 0.08 1.00 2.00 0.035 0.30 7.50~10.50 18.00~20.00 _ _ 0.15~0.30 _ 6 25 S30453 022Cr19Nil0N 0.030 1.00 2.00 0.035 0.30 8.00~11.00 18.00~20.00 _ _ 0.10~0.16 _ 7 32 S30908 06Cr23Nil3 0.08 1.00 2.00 0.035 0.30 12.00~15.00 22.00~24.00 _ _ _ Nb:0.15 8 35 S31008 06Cr25Ni20 0.08 1.50 2.00 0.035 0.30 19.00~22.00 24.0~26.00 _ _ _ _ 9 38 S31608 06Cr17Nil2Mo2 0.08 1.00 2.00 0.035 0.30 10.00~14.00 16.00~18.00 2.00~3.00 _ _ _ 10 39 S31603 022Cr17Nil2Mo2 0.030 1.00 2.00 0.035 0.30 10.00~14.00 16.00~18.00 2.00~3.00 _ _ _ 11 40 S31609 07Cr17Nil2Mo2 0.04~0.10 1.00 2.00 0.035 0.30 10.00~14.00 16.00~18.00 2.00~3.00 _ _ _ 12 41 S31668 06Cr17Nil2Mo2Ti 0.08 1.00 2.00 0.035 0.30 10.00~14.00 16.00~18.00 2.00~3.00 _ _ Ti:5C~0.70 GB/T 14976-2012 Table 3 Grade and Chemical Composition (Continued) Structure Type No GB/T 20878 Grade Chemical Composition (Mass Fraction) a/% No Unified Code Number C Si Mn P S Ni Cr Mo Cu N Other Austenite 13 43 S31658 06Cr17Nil2Mo2N 008 1.00 2.00 0.035 0.030 10.00~13.00 16.00~18.00 2.00~3.00 _ 0.10~0.16 14 44 S31653 022Cr7Nil2Mo2N 0.030 1.00 2.00 0.035 0.030 10.00~13.00 16.00~18.00 2.00~3.00 _ 0.10~0.16 15 45 S31688 06Cr18Nil2Mo2Cu2 0.08 1.00 2.00 0.035 0.030 10.00~14.00 17.00~19.00 1.20~2.75 1.00~2.50 _ _ 16 46 S31683 022Cr18Nil4Mo2Cu2 0.030 1.00 2.00 0.035 0.030 12.00~16.00 17.00~19.00 1.20~2.75 1.00~2.50 _ _ 14 49 S31708 06Cr19NIl3Mo3 0.08 1.00 2.00 0.035 0.030 11.00~15.00 18.00~20.00 3.00~4.00 _ _ _ 18 50 S31703 022Cr19Nil3Mo3 0.030 1.00 2.00 0.035 0.030 11.00~15.00 18.00~20.00 3.00~4.00 _ _ _ 19 55 S32168 06Cr18Nil1Ti 0.08 1.00 2.00 0.035 0.030 9.00~12.00 17.00~19.00 _ _ _ Ti:5C~0.70 20 56 S32169 07Cr19Nil1Ti 0.04~0.10 0.75 2.00 0.035 0.030 9.00~13.00 17.00~20.00 _ _ _ Ti:4C~0.60 21 62 S34778 06Cr19Nil1Nb 0.08 1.00 2.00 0.035 0.030 9.00~12.00 17.00~19.00 _ _ _ Nb:10C~1.10 22 63 S34779 07Cr18Nil1Nb 0.04~0.10 1.00 2.00 0.035 0.030 9.00~12.00 17.00~19.00 _ _ _ Nb:8C~1.10 Ferrite 23 78 S31148 06Cr13Al 0.08 1.00 1.00 0.035 0.030 (0.60) 11.50~14.50 _ _ _ Al:1.10~0.30 24 84 S11510 10Cr15 0.12 1.00 1.00 0.035 0.030 (0.60) 14.00~16.00 _ _ _ _ GB/T 14976-2012 Structure Type No GB/T 20878 Grade Chemical Composition (Mass Fraction) a/% No Unified Code Number C Si Mn P S Ni Cr Mo Cu N Other Austenite 25 85 S11710 10Cr17 0.12 1.00 1.00 0.035 0.030 （0.60） 16.00~18.00 — _ — Ti or Nb:0.10~1.00 26 87 S11863 022Cr18Ti 0.030 0.75 1.00 0.035 0.030 （0.60） 16.00~19.00 — _ — (Ti+Nb):［0.20+4(C+N)］~0.80 27 92 S11972 019Cr19