Structural Steel Pipe

2021-12-03 14:47:28

139次

Details:

Production Process of Structural Steel Pipe

The structure steel pipe has hot - rolled seamless steel tube and welded steel tube.The seamless steel tube for structure is divided into two types according to the provisions of "seamless steel tube for structure" (GB/ t8162-2008) : hot rolling (extrusion, expansion) and cold drawing (rolling).The outer diameter of hot-rolled steel pipe is 32-630mm and the wall thickness is 2.5-75mm.The outer diameter of cold-drawn steel pipe is 5-200mm and the wall thickness is 2.5-12mm.Welded steel pipe is made of steel plate or steel strip after crimping and forming, which can be divided into straight welded steel pipe and spiral welded steel pipe.The outer diameter and wall thickness of the direct-welded steel pipe are 5-508mm and 0.5-12.7mm respectively, which shall comply with the provisions of GB/ t3793-2008.The welded steel pipe for low-pressure fluid transportation is also called common welded pipe, commonly known as clarkpipe. The specification is expressed in mm of nominal diameter, which should comply with the provisions of GB/ t3091-2008 for low-pressure fluid transportation.

Specification of Structural Steel Pipe

OD: 88.9mm ~ 660mm

WT: 3mm ~ 17.5mm

LENGTH: 0.5mtr ~ 22mtr (5.8/6/11.8/12 meters, SRL, DRL)

Chemical Composition

Grade	C	Mn	P	S	Si	Cr	Mo
1010	0.08-0.13	0.30-0.60	≤0.04	≤0.05	-	-	-
1020	0.08-0.23	0.30-0.60	≤0.04	≤0.05	-	-	-
1045	0.43-0.50	0.60-0.90	≤0.04	≤0.05	-	-	-
4130	0.28-0.33	0.40-0.60	≤0.04	≤0.05	0.15-0.35	0.80-1.10	0.15-0.25
4140	0.38-0.43	0.75-1.00	≤0.04	≤0.05	0.15-0.35	0.80-1.10	0.15-0.25

Mechanical Properties

Grade	Condition	Tensile strength Mpa(min)	Yield stength Mpa(min)	Elongation %(min)
1020	CW	414	483	5
	SR	345	448	10
	A	193	331	30
	N	234	379	22
1025	CW	448	517	5
	SR	379	483	8
	A	207	365	25
	N	248	379	22
4130	SR	586	724	10
	A	379	517	30
	N	414	621	20
4140	SR	689	855	10
	A	414	552	25
	N	621	855	20