Seamless Steel Structural Tubing Manufacturer

Seamless Steel Structural Tubing

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Seamless steel structural tubing can be fit into two primary categories: hot rolled and cold rolled. Cold rolled can be further broken down into round tubes and profiled tubes.

No matter what the tube's cross section looks like, or the different processes it undergoes, the seamless steel structural tube is commonly used in structural parts of buildings and machinery.

As a seamless steel pipe manufacturer, we can build structural pipes and tubes to different standards, including ASTM A53, ASTM A106, and BS EN10210-1. We also use a variety of different steel grades in our pipe construction, including grade 20 carbon steel, grade 45 steel, Q235, Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, and 42CrMo alloy steel.

Standards
GB/T8162-2008, ISO2937, ASTM A53, ASTM A106, BS EN 10210-1

Uses
Structural tubes and pipes are widely used as structural parts in buildings, machinery, traffic, aerospace, and oil industries.

Dimensional Tolerance

Standards	Outside Diameter Tolerance		S/D	Wall Thickness Tolerance
GB/T 8162	D≤102	±1% or ±0.50mm, (choose the greater value)	-	±12.5%S
	D>102		≤0.05	±15%S
			>0.05~0.10	±12.5%S
			>0.10	12.5%/-10%S
DIN1629	D50	±0.50mm	S2Sn	15/-10%
	D48.3D48.3	±1%	2SnS4Sn	12.5/-10%
	D48.3D48.3	±1%	S4Sn	±9%
ASTM A53	D≤48.3	±0.4mm	15%/-12.5%S
ASTM A53	D≥60.3	±1%	15%/-12.5%S
ASTM A106	D≤48.3	±0.4mm	15%/-12.5%S
	D48.3-114.3	±0.8mm
	D141.3-219.1	1.6/-0.8mm
	D273.0-457	2.4/-0.8mm

Mechanical Performance

Standards	Steel Grades	Tensile Strength (MPa)	Yield Strength (MPa)≥		Elongation
Standards	Steel Grades	Tensile Strength (MPa)	< 16mm	16-30mm	Elongation
GB/T 8162	10	≥335	205	195	24
	20	≥410	245	235	20
	35	≥510	305	295	17
	45	≥590	335	325	14
	Q345B	470-630	345	325	21
DIN 1629			≤16mm	>16mm
	ST37.0	350-480	235	225	25
	ST44.0	420-550	275	245	21
	ST52.0	500-650	355	345	21
EN10210-1	S355	490-630	355	345	22
ASTM A53	A	≥330	≥205		Calculable
ASTM A53	B	≥415	≥240
ASTM A106	A	≥330	≥205
	B	≥415	≥240
	C	≥485	≥275

Chemical Composition (%)

Standards	Steel Grades	C	Si	Mn	P≤	S≤	Cu≤	Ni≤	Cr≤	Mo≤	V≤
GB/T 8162	10	0.07-0.13	0.17-0.37	0.35-0.65	0.030	0.030	0.25	0.30	0.15	/	/
	20	0.17-0.23	0.17-0.37	0.35-0.65	0.030	0.030	0.25	0.30	0.25	/	/
	35	0.32-0.39	0.17-0.37	0.50-0.80	0.030	0.030	0.25	0.30	0.25	/	/
	45	0.42-0.50	0.17-0.37	0.50-0.80	0.030	0.030	0.25	0.30	0.25	/	/
	Q345B	≤0.20	≤0.50	≤1.70	0.035	0.035	0.30	0.50	0.30	0.10	0.15
DIN 1629	St37.0	≤0.17	/	/	0.040	0.040	0.25	0.25	0.25	/	/
	St44.0	≤0.21	/	/	0.040	0.040	0.25	0.25	0.25	/	/
	St52.0	≤0.22	≤0.55	≤1.60	0.040	0.035	0.25	0.25	0.25	/	/
EN 10210-1	S355	≤0.22	≤0.55	≤1.60	0.035	0.035	0.25	0.25	0.25	/	/
ASTM A53	A	≤0.25	/	≤0.95	0.05	0.045	0.40	0.40	0.40	0.15	0.08
ASTM A53	B	≤0.30	/	≤1.20	0.05	0.045	0.40	0.40	0.40	0.15	0.08
ASTM A106	A	≤0.25	≥0.10	0.27-0.93	0.035	0.035	0.40	0.40	0.40	0.15	0.08
	B	≤0.30	≥0.10	0.29-1.06	0.035	0.035	0.40	0.40	0.40	0.15	0.08
	C	≤0.35	≥0.10	0.29-1.06	0.035	0.035	0.40	0.40	0.40	0.15	0.08

Technical Specs

Outer Diameter		Wall Thickness mm
inch	mm	2	2.6	3.6	4.5	5.5	7.1	9.5	12.5	13	14-16	17-19	20-25	31-60	61-70	81-90	91-120
0.84	21.3
1.05	26.7
1.315	33.4
1.66	42.2
1.9	48.3
2.375	60.3
2.875	73
3.5	88.9
4	101.6
4.5	114.3
5.563	141.3
6.625	168.3
8.625	219.1
10.75	273
12.75	323.9
14	355.6
16	406.4
18	457
20	508
22	559
24	610
26	660.4
28	711.2
30	762
32	813
34	864
36	914
38	965