20px arial, helvetica, sans-serif; white-space: normal; color: rgb(85,85,85); vertical-align: baseline; border-top: 0px; border-right: 0px; word-spacing: 0px; padding-top: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px\"> Large diameter seamless steel pipe is mainly used for general fluid pipe, oil and gas line pipe, structural pipe, pressure vessels, pipe, high pressure boiler tube and other tubes and military, the main pipe material for high-quality carbon steel, alloy structural steel, stainless steel and special alloys. In China, small-diameter seamless steel pipe production equipment developed rapidly, and the development of large-diameter seamless steel pipe production is lagging behind.
Large diameter seamless steel pipes dominates 65% of market share in Chinese boiler industry. Main Customers for international market: Alstom, Bechtel, Siemens Austria, Petrobras, Doosan Heavy, Hyundai., Essar, BHEL..
Yousin Steel, as a professional steel company, is devoted to provide customers with the most competitive product of Large diameter seamless steel pipe so as to meet customers’ needs.
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Standard:

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ASME SA 106 /ASTM A106

ASTM A53

ASTM A335 / ASME SA335

DIN17175

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ASME SA106B,C/ ASTM A106 B,C

ASTM A53Gr.B

ASTM A335 P11, P12, P15, P9, P22, P91, P92

DIN 17175 ST45.8

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Standard: ASME SA 106/ASTM, A106,ASTMA53, ASTM A335, DIN17175, GB5310
Grade: SA106B(C)/A106(C), A53GR/B, P11, P12, P15, P9, P22, P91, P92, ST45.8, 10CrMo910, 15Mo3,20G, 12CrMoG, 15CrMoG, 12Cr1MoVG

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Standard: ASTMA519, GB18248
Grade: GR4130, GR4140, 4130X, 30CrMo, 35CrMo, 37Mn, 37Mn2V

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Standard: EN10210,EN10025, EN10297, GB/T8162
Grade: S275J2H, S355J2H, S275N, S335N, 10~45#, Q345,27SiMn

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Standard: ASTMA333,GB/T18984
Grade: GR1~GR11, 16MnDG, 10MnDG

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Standard: API 5L, EN10216
Grade: X42, X52,X60, X65,X70, P235GH/TR2

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Standard: ASTM A312
Grade: 304(L),316(L),321, 347(H)

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Standard: GB9948
Grade: 10,20,12CrMo, 15CrMo, 1Cr2Mo, 1Cr5Mo, 1Cr19Ni9, 1Cr19Ni11N