ASTM A53 Grade B Seamless Pipe — Factory Direct Supplier | Huaxia-Steel

ASTM A53 Grade B seamless pipe is a carbon steel pipe used for low-pressure plumbing, mechanical, pressure and structural applications. Unlike ASTM A106, which focuses on high-temperature service, A53 covers both seamless and welded pipe in three grades: A, B and C, with Grade B being the most common choice for general service. Huaxia-Steel supplies A53 Gr B seamless pipe with plain, beveled or threaded ends and full certification.

Product Overview

Our A53 Grade B seamless pipe is produced by hot piercing and rolling, then cooled, straightened, cut and inspected. The grade offers good weldability, moderate strength and is suitable for water, steam, gas and air lines as well as structural and mechanical uses.

Specifications and Size Range

Item	Specification
Standard	ASTM A53 / A53M
Grade	Grade B
Type	Seamless (S) and Electric-Resistance-Welded (E)
NPS	1/8 inch – 26 inch
Outer diameter	10.3 mm – 660 mm
Wall thickness	Sch 10 – Sch XXS / custom
Length	5.8 m / 6 m / 11.8 m / 12 m or custom
Ends	Plain, beveled, threaded with couplings

Chemical Composition

Element	Limit
Carbon max	0.30 %
Manganese	1.20 % max
Phosphorus max	0.05 %
Sulfur max	0.045 %
Silicon	0.10 % min when silicon steel is required
Copper + Nickel + Chromium + Molybdenum	1.00 % max combined

Mechanical Properties

Property	Value
Tensile strength min	415 MPa
Yield strength min	240 MPa
Elongation	Depends on wall thickness; see ASTM A53
Hardness	Not specified; tested when required

Testing and Certification

ASTM A53 requires hydrostatic testing or non-destructive electric testing. We supply mill test certificates showing heat analysis, tensile test, hydrostatic or NDE result and dimensional inspection. Third-party inspection by SGS or BV is available.

• Hydrostatic test to specified pressure or 100 % NDE.
• Flattening test for seamless pipe.
• Bend test for welded pipe.
• Chemical analysis and tensile test per heat.
• Ultrasonic or eddy-current testing on request.

Applications

• Low-pressure steam, water, gas and air lines.
• Structural and mechanical tubing.
• Fence posts, handrails and general construction.
• Conveyor rollers and machinery frames.
• Fire protection systems (when compatible with local code).
• General plumbing and process piping where high temperature is not the primary factor.

Equivalent Grades

ASTM A53 Gr B is roughly equivalent to several international grades for low-pressure piping and structural applications.

Standard	Close Equivalent	DIN	JIS
ASTM A53 Gr B	API 5L Gr B	DIN 2391 St 45	JIS G3454 STPG 370
ASTM A106 Gr B	API 5L Gr B	DIN 17175 St 45.8	JIS G3456 STPT 370

Packing and Shipping

Pipe is bundled with steel straps, ends capped to prevent ingress and damage, and loaded in containers or on flat racks. Black paint, oil coating or varnish can be applied for rust protection during ocean shipment.

Need a reliable carbon steel supplier for your next project? Huaxia-Steel supplies mill-certified carbon steel bars, plates, pipes, flanges and fittings with full inspection, export packing and fast delivery. Request a quote today and our team will reply within 24 hours.