Special Welded Tubes are precision-engineered, high-frequency welded steel tubes designed to meet specific industry requirements, offering exceptional strength, durability, and corrosion resistance. Manufactured using advanced welding techniques like electric resistance welding (ERW), these tubes are available in various materials, including carbon steel, stainless steel, and alloy steel, to suit diverse applications such as automotive exhaust systems, oil and gas pipelines, and hydraulic systems.

Produced through cold-rolling and welding processes, Special Welded Tubes offer tight dimensional tolerances and customizable shapes, including round, square, rectangular, oval, and elliptic profiles. Available in thicknesses from 0.4 to 3.0 mm and diameters ranging from Ø6 to Ø2800 mm, these tubes meet standards like ASTM, API, JIS, DIN, and EN, ensuring compliance with rigorous industry specifications. Surface treatments such as galvanizing, painting, or 3LPE coatings enhance corrosion-resistant tubes for harsh environments.

Rigorous testing, including eddy current, ultrasonic, and hydrostatic tests, ensures weld integrity and consistent quality. The high strength-to-weight ratio and cost-effective production make Special Welded Tubes ideal for industries requiring precision tubing, such as construction, power generation, and chemical processing. These tubes are designed for welding, bending, and forming, with non-destructive testing ensuring reliability in critical applications.

Compared to seamless tubes, Special Welded Tubes offer cost advantages while maintaining comparable strength and performance, making them a preferred choice for large-scale projects. Their versatility in material grades (e.g., SPHC, Q195-235, 304, 316L) and shapes ensures compatibility with complex industrial systems.

Special Welded Tubes address challenges like pipeline wear, corrosion, and structural demands, providing engineers with reliable, high-performance solutions for specialized industrial applications.

Heat treatment:

After welding,all tubes shall be heat treated at a temperature of 1650°F(900℃) or higher and followed by cooling in air or in the cooling chamber of a controlled-atmosphere furnace,Cold-drawn tubes shall be heat treated after the final cold-draw pass at a temperature of 1200°F(650℃)or higher.

Surface Condition:

Finished tubes shall be free of scale,A slight amount of oxidation will not be considered as scale.

Mechanical Tests Required:

Flattenting Test/Flaring test/Flange test/Crush test/Tension test/Reverse Flattening test/Hydrostatic or Nondestructive Electric Test

Special Welded Tubes Specifications

Specifications of

Special Welded Tubes

Special welded tubes are manufactured to precise industry standards and customer specifications, tailored for diverse industrial applications.

These tubes are crafted from carbon steel, alloy steel, stainless steel, or other specialized materials, ensuring compatibility with specific project requirements. Dimensional tolerances are tightly controlled per customer specifications or standards like ASTM, API, or DIN, guaranteeing precision for applications such as boilers, heat exchangers, and pipelines.

Surface finishes include smooth or rough options, with treatments like galvanizing, painting, or protective coatings (e.g., 3LPE, FBE) to enhance durability. Available in standard lengths or cut-to-length, with thickness varying based on pressure and temperature requirements, these tubes undergo rigorous testing (e.g., hydrostatic, ultrasonic) to ensure reliability in demanding environments like oil and gas, petrochemical, and structural systems.

Special welded tubes offer versatile, high-quality solutions, customized to meet stringent industrial needs with precision and durability.

Key Benefits

High Strength

Minimum tensile strength of 415 MPa for demanding applications.

Corrosion Resistance

Galvanized coatings enhance durability in harsh environments.

Versatile Manufacturing

Available in seamless, ERW, and furnace-welded types.

Wide Size Range

NPS 1/8–26 with customizable lengths for diverse projects.

Cost-Effective

Affordable solution for low to medium-pressure systems.

Standards Compliance

Meets ASTM A53 and ASME SA53 standards.

ASTM A53 Grade B Pipes are carbon steel pipes for mechanical and pressure applications, suitable for water, gas, oil, and structural uses.

High strength (415 MPa tensile), corrosion resistance with galvanization, and versatile seamless/ERW options.

C ≤0.30%, Mn ≤1.20%, P ≤0.05%, S ≤0.045%, Cu/Ni/Cr ≤0.40%, Mo ≤0.15%, V ≤0.08%.

Tensile ≥415 MPa, Yield ≥240 MPa, Elongation ≥30%.

NPS 1/8–26 [DN 6–650], wall thickness from SCH 10 to SCH 160.

Tensile, flattening, hydrostatic, and nondestructive electric tests.

Water supply, gas and oil pipelines, fire sprinklers, HVAC, low-pressure fluid conveyance, and structural uses.

ASTM A53 Grade B is for low to medium-pressure applications, while A106 is for high-temperature services.

Yes, galvanization enhances corrosion resistance for outdoor and high-moisture environments.

ASTM A53/A53M and ASME SA53 standards ensure quality and reliability.

You Can Also Search ASTM A53 Grade B Pipes by

Explore ASTM A53 Grade B Pipes with targeted long-tail keywords for specifications, applications, and materials.

Standards and Specifications

• ASTM A53 Grade B pipe specifications
• ASME SA53 carbon steel pipes
• ASTM A53 seamless pipe standards
• Galvanized carbon steel pipe specifications

Applications

• ASTM A53 Grade B pipes for water supply
• Carbon steel pipes for gas and oil
• ASTM A53 ERW pipes for fire sprinklers
• Seamless pipes for HVAC systems

Material and Grades

• ASTM A53 Grade B pipe properties
• Carbon steel seamless pipes
• ASTM A53 Grade B chemical composition
• High-strength carbon steel pipes

Manufacturing and Testing

• ASTM A53 ERW pipe manufacturing process
• Galvanized pipe quality testing
• ASTM A53 Grade B pipe heat treatment
• Corrosion-resistant steel pipe quality

Note: ASTM A53 Grade B Pipes meet international standards, ensuring high performance and reliability. Contact suppliers for detailed specifications.

Special Welded Tubes Standard Specifications

Chemical Composition of Special Welded Tubes
Data	Elements（%）
Material Grade	C	Mn	S	P	Si
Q195	0.06-0.12	0.25-0.50	<0.05	<0.045	<0.30
Q215	0.09-0.15	0.25-0.55	<0.05	<0.045	<0.30
Q235	0.12-0.20	0.30-0.70	<0.045	<0.045	<0.30
Q345	<0.20	1.0-1.6	<0.04	<0.04	<0.55

The chemical composition ensures weldability and durability for Special Welded Tubes in fluid conveyance and structural applications.

Mechanical Properties of Special Welded Tubes
Material Grade	Yield Point (Mpa)	Tensile Strength (Mpa)	Elongation (%)
Q195	>195	315-430	32-33
Q215	>215	335-450	26-31
Q235	>235	375-500	24-26
Q345	>345	470-630	21-22

These properties ensure Special Welded Tubes deliver robust performance in pressure and structural applications.

Chemical Composition of Stainless Hollow Sections (Grades 304, 304L, 316, 316L per ASTM A554/A312)
Grade	C (% max)	Mn (% max)	Si (% max)	P (% max)	S (% max)	Cr (%)	Ni (%)	Mo (%)	N (% max)
304	0.08	2.00	1.00	0.045	0.030	18.0-20.0	8.0-11.0	-	0.10
304L	0.03	2.00	1.00	0.045	0.030	18.0-20.0	8.0-12.0	-	0.10
316	0.08	2.00	1.00	0.045	0.030	16.0-18.0	10.0-14.0	2.0-3.0	0.10
316L	0.03	2.00	1.00	0.045	0.030	16.0-18.0	10.0-14.0	2.0-3.0	0.10

The low carbon content in 304L and 316L enhances weldability, while molybdenum in 316 and 316L improves resistance to pitting and crevice corrosion, making Special Welded Tubes ideal for harsh environments.

Mechanical Properties of Stainless Hollow Sections (Grades 304, 304L, 316, 316L per ASTM A554/A312)
Grade	Tensile Strength (min, MPa)	Yield Strength (min, MPa)	Elongation (min, %)	Hardness (max, HB)	Hardness (max, HRB)
304	515	205	40	201	92
304L	485	170	40	201	92
316	515	205	40	217	95
316L	485	170	40	217	95

These mechanical properties make Special Welded Tubes suitable for applications requiring high strength and corrosion resistance, such as architectural structures, marine environments, and chemical processing.

efficient overseas shipping options

International shipping for Special Welded Tubes:

We specialize in international shipping for Special Welded Tubes, ensuring safe and timely delivery worldwide.

Our clients come to us from across the globe for our unique shaped tubing and specialist tube fabrication. We can Special Welded Tubes to North America and Europe in as little as soon as posible.

Our expert shipping team will meet your transit times and budget; get in touch to discuss transportation options.

Special Welded Tubes

Elliptic Pipe

Oval Pipe

Flat oval pipes

Stainless Hollow Section

Stainless Steel Oval Pipe

Rectangular Hollow Section

Square Hollow Section

Special Welded Tubes