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ASTM A501 Grade B is a standard specification for hot-formed welded and seamless carbon steel structural tubing with a minimum yield strength of 40 ksi (280 MPa). It is commonly used in construction, bridges, and general structural applications where high strength and weldability are required.

ASTM A501 Grade B Tube
Grade: GR.B
Size:
SQUARE: 20MM * 20MM - 1200MM * 1200MM
RECTANGULAR: 20MM * 30MM - 1500MM * 1200MM
Wall thickness: 1.3MM - 50MM
Wall Thickness Tolerance: Control within the standard limits.
Length: 1 - 12M, normally 5.8M,6M, 12M, also depends on the requirements
Surface treatment: Galvanizing, Black vanish, Carving, Slightly oil painting, PVC clothes cover each bundle etc.
Production capacity: 300000 tons per year.
Production delivery time:15 -- 30 days acc to order quantity and sizes.
Shipping: Bulk vessel shipment & Container shipment.
Brand: LEFIN STEEL

Chemical Composition
The chemical composition (max % by weight) for A501 Grade B is as follows:

Composition,%
	Grade B
Element	Heat analysis	Product analysis
Carbon,max	0.22	0.26
Manganese,max	1.4	1.45
Phosphorus,max	0.03	0.04
Suffur,max	0.02	0.03
Copper,when copper steel is specified,min	0.2	0.18

Note: Unlike ASTM A500 (cold-formed tubing), A501 allows for higher carbon and manganese content, improving weldability and strength.

Mechanical Properties

Property	Requirement
Tensile Strength	65 ksi min (450 MPa)
Yield Strength	40 ksi min (280 MPa)
Elongation (in 2")	24% min

Impact Testing: Not typically required unless specified by the purchaser.

Manufacturing Process
Hot-formed (seamless or welded)

Can be produced via electric resistance welding (ERW), continuous welding, or seamless process.

Typically supplied in round, square, or rectangular shapes.

Applications And Advantages
Applications
Structural frameworks (buildings, bridges)
Construction machinery (cranes, scaffolding)
Transmission towers & poles
Heavy equipment & trailers

Advantages
Higher strength-to-weight ratio than A500
Better weldability due to controlled chemistry
Cost-effective for structural applications

Comparison With ASTM A500

Feature	A501 Gr. B	A500 Gr. B
Forming Process	Hot-formed	Cold-formed
Carbon Content	Higher (0.26% max)	Lower (0.23% max)
Yield Strength	50 ksi (345 MPa)	46 ksi (317 MPa)
Weldability	Better due to higher Mn	Slightly less favorable
Common Shapes	Round, Square, Rectangular	Same

Conclusion
ASTM A501 Grade B is a high-strength, hot-formed structural tubing ideal for welded construction projects requiring durability and ease of fabrication. It offers a balance of strength, weldability, and cost efficiency, making it a preferred choice over A500 in certain structural applications.

ASTM A501 Grade B Tube

ASTM A501 Grade B Tube Grade: GR.A, GR.B, GR.C Size: SQUARE: 20MM * 20MM - 1200MM * 1200MM RECTANGULAR: 20MM * 30MM - 1500MM * 1200MM Wall thickness: 1.3MM - 50MM Wall Thickness Tolerance: ±10% Length: 1 - 12M, normally 5.8M,6M, 12M, also depends on the requirements Surface treatment: Galvanizing, Black vanish, Carving, Slightly oil painting, PVC clothes cover each bundle etc. Production capacity: 300000 tons per year. Production delivery time:15 -- 30 days acc to order quantity and sizes. Shipping: Bulk vessel shipment & Container shipment. Brand: LEFIN STEEL

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