Construction

Structural Steel Tubes for Construction ASTM A500 Gr.B/C Certified

DETAILS AND PARAMETERS

TOLERANCES

TECHNICAL SHEET

Welded Steel Pipes: Your Trusted Partner for Global Industrial Needs

With 18 years of specialized experience in steel export, we stand as a reliable supplier of high-performance welded steel pipes, serving clients across 50+ countries. Our deep industry knowledge, strict quality control, and tailored solutions make us the first choice for international projects—from infrastructure to manufacturing.

1. What Are Welded Steel Pipes?

Welded steel pipes are cylindrical steel products formed by bending flat steel plates or coils into a tubular shape and then joining the edges via welding (e.g., ERW, SAW, TIG). Unlike seamless pipes, welded pipes offer cost-effectiveness, consistent dimensions, and high production efficiency, making them ideal for large-scale industrial applications. They retain excellent strength, corrosion resistance, and durability to meet diverse project requirements.

2. Welded Pipe Grades: Engineered for Performance

We supply welded pipes in industry-leading grades, each optimized for specific environments and loads:

Carbon Steel Grades: API 5L (B, X42-X80), ASTM A53 (A/B), DIN 2448. Perfect for oil/gas transmission, water pipelines, and structural framing—offering superior tensile strength and impact resistance.

Stainless Steel Grades: ASTM A312 (304, 316, 316L). Resistant to rust, chemicals, and high temperatures, ideal for food processing, pharmaceuticals, and marine engineering.

Alloy Steel Grades: ASTM A672 (C60-C90). Designed for high-pressure, high-temperature applications like power plants and industrial boilers.

3. Dimensions: Customized to Your Exact Needs

We offer flexible size options to match global standards and project specifications:

Outer Diameter (OD): 1/2" (12.7mm) to 63" (1600mm)

Wall Thickness: SCH 10, SCH 20, SCH 40, SCH 80, SCH 160, XS, XXS (or custom per request)

Length: 6m, 12m (standard), or cut-to-length (3m-18m) for easy transportation and on-site use.

End Types: Plain End (PE), Beveled End (BE), Threaded End (TE) to fit different connection requirements.

4. Key Applications: Powering Global Industries

Our welded steel pipes are trusted in critical sectors worldwide:

Oil & Gas: Transmission pipelines, well casings, and offshore platforms (API 5L X65/X70 grades).

Water & Wastewater: Municipal water supply, sewage treatment, and irrigation systems (ASTM A53).

Construction: Structural columns, scaffolding, and building frames (carbon steel grades).

Manufacturing: Machinery parts, automotive components, and storage tanks (stainless/alloy steel).

Energy: Power plant pipelines (high-temperature alloy grades for steam and heat transfer).

5. FAQ: Your Questions Answered

Q1: Do you provide certifications for international markets?

Yes! All our welded pipes come with ISO 9001, API 5L, ASTM, DIN, and CE certifications—meeting import standards for the EU, USA, Middle East, Southeast Asia, and more. We also offer custom test reports (NDT, hydrostatic testing) upon request.

Q2: What is your lead time for bulk orders?

For standard grades/sizes: 7-15 days (stock available). For custom orders (special grades/thicknesses): 20-30 days—faster than industry averages, thanks to our 3 production facilities and streamlined supply chain.

Q3: Can you handle door-to-door delivery to my country?

Absolutely! With 18 years of export experience, we partner with top logistics companies (Maersk, COSCO) to offer FOB, CIF, and CFR terms. We handle customs clearance, documentation, and last-mile delivery—ensuring your order arrives on time, anywhere in the world.

Why Choose Us? 18 Years of Steel Export Excellence

Proven Expertise: 18 years of serving global clients—we understand international standards (ASME, BS, JIS) and local market needs.

Quality Assurance: 100% inspection (hydrostatic, ultrasonic, visual) before shipment; zero-defect record for 5 consecutive years.

Custom Solutions: From material selection to size customization, we tailor pipes to your project’s unique demands.

Competitive Pricing: Direct factory supply (no middlemen) + bulk raw material purchasing = cost savings for you.

Contact us today to get a free quote and technical consultation—let’s build your next project with strength and reliability!

O.D.		W.T.							Length(m)
Inch	mm	Min.Yield Strength(Mpa)
Inch	mm	245(B)	290(X42)	360(X52)	415(X60)	450(X65)	485(X70)	555(X80)
16	406	6.0-14.0	6.0-13.0	6.0-12.0	6.0-11.0	6.0-10.5	6.0-10.0	6.0-9.0	6.0-12.3
18	457	6.0-15.0	6.0-14.0	6.0-13.0	6.0-12.0	6.0-11.5	6.0-11.0	6.0-10.0	6.0-12.3
20	508	6.0-16.0	6.0-15.0	6.0-14.0	6.0-13.0	6.0-12.5	6.0-12.0	6.0-11.0	6.0-12.3
22	559	6.0-17.0	6.0-16.0	6.0-15.0	6.0-14.0	6.0-13.5	6.0-13.0	6.0-12.0	6.0-12.3
24	610	6.0-18.0	6.0-17.0	6.0-16.0	6.0-15.0	6.0-14.5	6.0-14.0	6.0-13.0	6.0-12.3
26	660	6.0-19.0	6.0-18.0	6.0-17.0	6.0-16.0	6.0-15.0	6.0-15.0	6.0-14.0	6.0-12.3
28	711	6.0-20.0	6.0-19.0	6.0-18.0	6.0-17.0	6.0-16.5	6.0-16.0	6.0-15.0	6.0-12.3
30	762	7.0-21.0	7.0-20.0	7.0-19.0	7.0-18.0	7.0-17.5	7.0-17.0	7.0-16.0	6.0-12.3
32	813	7.0-22.0	7.0-21.0	7.0-20.0	7.0-19.0	7.0-18.5	7.0-18.0	7.0-17.0	6.0-12.3
34	864	7.0-23.0	7.0-22.0	7.0-21.0	7.0-20.0	7.0-19.5	7.0-19.0	7.0-18.0	6.0-12.3
36	914	8.0-24.0	8.0-23.0	8.0-22.0	8.0-21.0	8.0-20.5	8.0-20.0	8.0-19.0	6.0-12.3
38	965	8.0-25.0	8.0-24.0	8.0-23.0	8.0-22.0	8.0-21.5	8.0-21.0	8.0-20.0	6.0-12.3
40	1016	8.0-26.0	8.0-25.0	8.0-24.0	8.0-23.0	8.0-22.5	8.0-22.0	8.0-21.0	6.0-12.3
42	1067	8.0-26.0	8.0-25.0	8.0-24.0	8.0-23.0	8.0-22.5	8.0-22.0	8.0-21.0	6.0-12.3
44	1118	9.0-27.0	9.0-26.0	9.0-24.5	9.0-23.5	9.0-22.8	9.0-22.0	9.0-21.0	6.0-12.3
46	1168	9.0-27.0	9.0-26.0	9.0-24.0	9.0-23.5	9.0-22.8	9.0-22.0	9.0-21.0	6.0-12.3
48	1219	9.0-28.0	9.0-27.0	9.0-25.4	9.0-24.0	9.0-23.5	9.0-23.0	9.0-22.0	6.0-12.3
52	1321	9.0-28.0	9.0-27.0	9.0-25.4	9.0-24.2	9.0-23.5	9.0-23.0	9.0-22.0	6.0-12.3
56	1422	10.0-29.0	10.0-28.0	10.0-26.0	10.0-24.5	10.0-23.8	10.0-23.0	10.0-22.0	6.0-12.3
60	1524	10.0-29.0	10.0-28.0	10.0-26.0	10.0-24.5	10.0-23.8	10.0-23.0	10.0-22.0	6.0-12.3
64	1626	10.0-30.0	10.0-29.0	10.0-27.0	10.0-25.4	10.0-24.8	10.0-24.0	10.0-23.0	6.0-12.3
68	1727	10.0-30.0	10.0-29.0	10.0-27.0	10.0-25.4	10.0-24.8	10.0-24.0	10.0-23.0	6.0-12.3
72	1829	10.0-30.0	10.0-29.0	10.0-27.0	10.0-25.4	10.0-24.8	10.0-24.0	10.0-23.0	6.0-12.3

Tolerance of Outside Diameter and Wall Thickness

Types	Standard
Types	SY/T5040-2000	SY/T5037-2000	SY/T9711.1-1977	ASTM A252	AWWA C200-97	API 5L PSL1
Tube end OD deviation	±0.5%D	±0.5%D	-0.79mm～+2.38mm	<±0.1%T	<±0.1%T	±1.6mm
Wall thickness	±10.0%T	D<508mm, ±12.5%T	-8%T～+19.5%T	<-12.5%T	-8%T～+19.5%T	5.0mm<t<15.0mm, ±0.11="" <="" p="" style="padding: 0px; margin: 0px;">
Wall thickness	±10.0%T	D>508mm, ±10.0%T	-8%T～+19.5%T	<-12.5%T	-8%T～+19.5%T	T≥15.0mm, ±1.5mm

Chemical Composition and Mechanical Properties

Standard	Grade	Chemical Composition(max)%					Mechanical Properties(min)
Standard	Grade	C	Mn	Si	S	P	Yield Strength(Mpa)	Tensile Strength(Mpa)
GB/T700-2006	A	0.22	1.4	0.35	0.050	0.045	235	370
	B	0.2	1.4	0.35	0.045	0.045	235	370
	C	0.17	1.4	0.35	0.040	0.040	235	370
	D	0.17	1.4	0.35	0.035	0.035	235	370
GB/T1591-2009	A	0.2	1.7	0.5	0.035	0.035	345	470
	B	0.2	1.7	0.5	0.030	0.030	345	470
	C	0.2	1.7	0.5	0.030	0.030	345	470
BS En10025	S235JR	0.17	1.4	-	0.035	0.035	235	360
	S275JR	0.21	1.5	-	0.035	0.035	275	410
	S355JR	0.24	1.6	-	0.035	0.035	355	470
DIN 17100	ST37-2	0.2	-	-	0.050	0.050	225	340
	ST44-2	0.21	-	-	0.050	0.050	265	410
	ST52-3	0.2	1.6	0.55	0.040	0.040	345	490
JIS G3101	SS400	-	-	-	0.050	0.050	235	400
JIS G3101	SS490	-	-	-	0.050	0.050	275	490
API 5L PSL1	A	0.22	0.9	-	0.03	0.03	210	335
	B	0.26	1.2	-	0.03	0.03	245	415
	X42	0.26	1.3	-	0.03	0.03	290	415
	X46	0.26	1.4	-	0.03	0.03	320	435
	X52	0.26	1.4	-	0.03	0.03	360	460
	X56	0.26	1.1	-	0.03	0.03	390	490
	X60	0.26	1.4	-	0.03	0.03	415	520
	X65	0.26	1.45	-	0.03	0.03	450	535
	X70	0.26	1.65	-	0.03	0.03	585	570

Comments (2)

Katherine A. Fogg

November 25, 2024

Their products are of excellent quality and they offer generous discounts. This is their third cooperation