Seamless Steel Pipe

Seamless pipes are produced starting from steel billets, that are heated and perforated to create the tubular section. The word “seamless” means the absence of seam welds. Seamless pipe has higher pressure, higher temperature, higher mechanical stress & corrosive atmosphere than welded pipes.

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Introduction

Steel grades

Typical pipe material

Standard	Common grades
ASTM A53	A53GR.A, A53GR.B
ASTM A106	A106 GR.A, A106Gr.B, A106Gr.C
ASTM A519	1020, 1035, 1045, 4130, 4140
ASME SA106	SA106B, SA106C
ASME SA179	SA179
ASME SA335	P5, P9, P11, P12, P22, P91
ASME SA213	T5, T9, T11, T12, T22, T91
ASME SA192	SA192
ASME SA210	SA210A1, SA210C
GB/T 8162	10#, 20#, 45#, Q345B, A345C, Q345D, Q345E, 20Cr, 40Cr, 27SiMn, 15CrMo, 20CrMo, 35CrMo, 42CrMo
GB/T 8163	10#, 20#, Q345A, Q345B, Q345C, Q345D, Q345E
GB/T 5310	20G, 20MnG, 25MnG, 15MoG, 12CrMoG, 15CrMoG, 12Cr1MoG
GB/T 3087	10#, 20#
GB/T 18248	30CrMo, 30CrMnSiA, 35CrMo, 34CrMo4
DIN1629	St37.0, St44.0, St55, St52.0
DIN17175	St35.8, St45.8, 15Mo3, 13CrMo44, 10CrMo910,12Cr1MoV
API 5L PSL1	Gr.A, Gr.B, X42, X46, X52, X56, X60, X65, X70, X80
API 5L PSL2	API 5L PSL2: Gr.B, X42, X52, X56, X60, X70, X80
API 5CT	J55, K55, N80, L80-1, C90-1, P110
EN 10210	S235JRH, S275J0H, S275J2H, S355J0H, S355J2H, S355K2H
EN 10216-2	P235GH, P265GH, 16Mo3, 13CrMo4-5, 10CrMo9-10
EN 10297	E355, C45, 34CrMo4
JIS G3461	STB 340, STB 410

Seamless Pipes Specification
Out diameter:10.3mm--1060mm
Wall thickness: 1.0mm--120mm
Length: 3meter-18meter
Manufacturing type: Seamless Steel Pipe
Uses: seamless steel pipes for use in the transportation of gas, water and oil in the oil and gas industry.

Application

Seamless pipe as the name suggests is a pipe without a seam or a weld-joint in contrast to Seam or Welded pipe. In a Seam or Welded pipe, the seam or the weld-joint is the weaker part of the pipe limiting the strength of the pipe to the strength of the weld-joint. Whereas the seamless pipe does not have any such joint and thus has uniform structure & strength all over the pipe body. Thus the seamless pipe can withstand higher pressure, higher temperature, higher mechanical stress & corrosive atmosphere and find wide applications in oil & gas, refinery, petrochemical, chemical, fertilizer, power, automotive, bearing, mechanical & structural applications.

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