GB 5310-2008 pipe specification

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GB 5310-2008 pipe specification 

Seamless tubes for making steam boiler whose pressure is high or higher and seamless tubes 

used as pipelines. 

GB 5310- 2008 is a national standard specifies classification, code name, dimension, shape, 

weight, technical requirements, specimen, test methods, test rules, packaging, mark and quality 

certificate. GB 5310- 2008 standard is applicable to seamless tubes for making steam boiler whose 

pressure is high or higher and seamless tubes used as pipelines. 

20MnG high pressure boiler pipe is a high manganese carbon carburizing steel, the harden-ability, strength and plasticity than 20 steel 

cutting performance also improved, good low temperature impact toughness and weld-ability. 

Used to manufacture camshafts, gears, couplings, hinges, pin tow bar, crankshaft bearing rings. 

High pressure boiler pipe is a boiler tubes are seamless steel pipe category. The method of manufacturing 

seamless pipes is the same, but there are strict requirements for steels used in manufacturing of tube. High 

pressure boiler tubes when used often in high temperature and high pressure conditions, under the action of the 

tube in the high temperature flue gas and water vapor will occur oxidation and corrosion. Steel pipe with high 

rupture strength, high resistance to oxidation corrosion and good organizational stability. High pressure boiler 

tube is mainly used to make high-pressure and ultra-high pressure boiler superheater tubes, reheater tubes, 

windpipe, main stream pipe. 

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Page:1 of GB5310-2008 pipe specification.docx



高压锅炉管 GB5310-2008 是用于制造各种结构低高压锅炉过热蒸汽管、沸水管及机车锅炉用过热蒸汽管、大 

烟管、小烟管和拱砖管用的优质碳素结构钢热轧和冷拔 ( 轧 ) 无缝钢管。 GB5310-2008《高压锅炉 

用无缝钢管》的规定。 

主要钢级牌号 

20G, 20MnG, 25MnG, 15MoG, 20MoG, 12CrMoG, 15CrMoG(T12/P12), 12CrMoG, 12Cr2MoWVTiB. 

( 经协商 , 也可供应其他特殊牌号的钢管 ) 

Chemical Compositions(%) of GB 5310-2008 

Steel grade C Si Mn P S Cr Mo 

20G 0.17-0.24 0.17-0.37 0.35-0.65 ≤0.030 ≤0.030 ≤0.25 ≤0.15 

20MnG 0.17-0.24 0.17-0.37 0.70-1.00 ≤0.030 ≤0.030 ≤0.25 ≤0.15 

25MnG 0.18-0.24 0.17-0.37 0.80-1.10 ≤0.030 ≤0.030 ≤0.25 ≤0.15 

15CrMo 0.12-0.18 0.17-0.37 0.40-0.70 ≤0.030 ≤0.030 0.80-1.10 0.40-0.55 

12Cr2MoG 0.08-0.15 ≤0.50 0.40-0.70 ≤0.030 ≤0.030 2.00-2.50 0.90-1.20 

12Cr1MoV 0.08-0.15 0.17-0.37 0.40-0.70 ≤0.030 ≤0.030 0.90-1.20 0.25-0.35 

12Cr2MoWVTiB 0.08-0.15 0.45-0.75 0.45-0.65 ≤0.030 ≤0.030 1.60-2.10 0.50-0.65 

10Cr9Mo1VNb 0.08-0.12 0.20-0.50 0.30-0.60 ≤0.020 ≤0.010 8.00-9.50 0.85-1.05 

Steel Grade Cu Ni V Al W Ti Nb 

20G ≤0.20 ≤0.25 ≤0.08 

20MnG ≤0.20 ≤0.25 ≤0.08 

25MnG ≤0.20 ≤0.25 ≤0.08 

15CrMo ≤0.20 ≤0.30 

12Cr2MoG ≤0.20 ≤0.30 

12Cr1MoV ≤0.20 ≤0.30 0.15-0.30 

12Cr2MoWVTiB ≤0.20 ≤0.30 0.28-0.42 0.30-0.55 0.08-0.15 B 0.002-0.008 

10Cr9Mo1VNb ≤0.20 ≤0.40 0.18-0.25 ≤0.015 0.06-0.10 





外观质量 

钢管内外表面不允许有裂缝、折叠、轧折、结疤、离层和发纹。 

这些缺陷应完全清除掉。 

清除深度不得超过公称壁厚的负偏差 , 其清理处实际壁厚不得小于壁厚所允许的最小值。 

Mechanical Properties of GB5310-2008 

Steel Grade Yield Strength (Mpa) Tensile Strength (Mpa) Elongation (%) 

20G 410-550 245 24 

20MnG ≥415 240 22 

25MnG ≥485 275 20 

15MoG 450-600 270 22 

12CrMoG 410-560 205 21 

12Cr2MoG 450-600 280 20 

12Cr1MoVG 470-640 255 21 

12Cr2MoWVTib 540-735 345 18 

10Cr9Mo1VNb ≥585 ≥415 ≥20 

The W.T. tolerance of GB5310-2008 

W.T.(S) 

Tolerance of W.T. 

+15%(+0.48mm min) 



View the PDF catalogue of 

• GB 3087-2008 Standard Specifictaion 

• 20G Boiler steel pipe 

• 20MnG, high manganese carbon carburizing steel 

• 25MnG, High Pressure Boiler Seamless Steel Pipe 

• 15CrMo Alloy steel tube 

• 12Cr2MoG alloy steel pipe 

• 12Cr1MoV alloy steel pipe 

• 12Cr2MoWVTiB alloy seamless steel pipe 

Referenced Documents 

• A999/A999M Specification for General Requirements for Alloy and Stainless Steel Pipe 

• E213 Practice for Ultrasonic Examination of Metal Pipe and Tubing 

• E309 Practice for Eddy-Current Examination of Steel Tubular Products Using Magnetic Saturation 

• E381 Method of Macroetch Testing Steel Bars, Billets, Blooms, and Forgings 

• E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS) 

• E570 Practice for Flux Leakage Examination of Ferromagnetic Steel Tubular Products 

• B36.10M Welded and Seamless Wrought Steel Pipe 

• SAE J 1086 Practice for Numbering Metals and Alloys (UNS) 

• SNT-TC-1A Recommended Practice for Nondestructive Personnel Qualification and Certification 

Read more: http://www.sunnysteel.com/blog/index.php/astm-a335-pipe-specifications/ 





Relation information of steel 

• Why seamless steel pipe? Some benefits of Seamless Steel Pipe 

• Seamless steel pipes for high temperature and pressure sevice 

• ASTM A335 Pipe Specifications, Seamless Ferritic Alloy Steel Pipe for High-Temperature Service 

• ASTM Standard of Steel pipes 

• Silicon-Manganese Steel, resulfurized and rephosphorized Carbon Steels 

• ASTM Standard for Boilers tube, Super heater tubes 

• ASTM standard for forgings 

• ASTM standard for steel castings 

• ASTM Standard of Structural Tubing 

• ASTM Standard of Steel pipes 

• ASTM standard for Welded fittings 

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GB 5310-2008 pipe specification

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