Brief Introduction

ASTM A501 GR.B TUBE

Size: Square Tube: 20MM * 20MM - 1200MM * 1200MM
Rectangular Tube: 20MM * 30MM - 1500MM * 1200MM
Wall Thickness: 1.3MM - 50MM
Length: 1M - 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.
Application: Bolted construction of bridges and buildings, as well as for General structural purposes.

Chemical Composition

	COMPOSITION, %
	GRADE A		GRADE B,C
	HEAT ANALYSIS	PRODUCT ANALYSIS	HEAT ANALYSIS	PRODUCT ANALYSIS
Carbon(C),max	0.26	0.30	0.22	0.26
Manganese(Mn),max	no requirement	no requirement	1.40	1.45
Phosphorus(P),max	0.035	0.045	0.030	0.040
Sulfur(S),max	0.035	0.045	0.020	0.030
Copper(Cu),min	0.20	0.18	0.20	0.18

Carbon (C): Lower carbon content compared to Grade C enhances weldability and reduces the risk of cracking during welding.

Manganese (Mn): Manganese improves strength and toughness, making the material more durable.

Phosphorus (P): Lower phosphorus content reduces the risk of brittleness and improves overall material quality.

Sulfur (S): Lower sulfur content enhances the material's ductility and reduces the risk of cracking.

Copper (Cu): Copper can improve corrosion resistance in certain environments.

Physical Requirements

ASTM A501 Tensile and Impact Requirements
	Wall Thickness	GRADE A		GRADE B		GRADE C
TENSILE STRENGTH,min	All	58000psi	400MPa	65000psi	448MPa	70000psi	483MPa
	WT≤25mm	39000psi	270MPa	46000psi	315MPa	50000psi	345MPa
	25mm＜WT≤50mm	38000psi	260MPa	45000psi	310MPa	49000psi	340MPa
YIELD STRENGTH，min	50mm＜WT≤76mm	36500psi	250MPa	42500psi	290MPa	47500psi	330MPa
	76mm＜WT≤100mm	35000psi	240MPa	40000psi	280MPa	46000psi	315MPa
ELONGATION,min		25%		24%		23%

Tensile Strength: Minimum 65,000 psi (448 MPa). This high tensile strength ensures that the material can withstand significant loads without breaking.

Yield Strength: Minimum 46,000 psi (315 MPa) for wall thicknesses ≤ 1 inch (25 mm). The yield strength indicates the material's ability to deform elastically before plastic deformation occurs.

Elongation: Minimum 24%. This elongation value ensures that the material has good ductility, allowing it to be formed and bent without cracking.

Production Process

1.Raw Material Preparation: Steel is produced using basic-oxygen or electric-arc-furnace methods, ensuring it meets the chemical composition requirements for Grade B.

2.Tubing Formation: The steel is formed into tubes using methods such as seamless rolling, electric resistance welding (ERW), or submerged arc welding (SAW). The tubes are then hot-formed to achieve the desired shape and size.

3.Heat Treatment: For thicker-walled tubes (over 13 mm), normalizing heat treatment may be applied to ensure uniform mechanical properties.

4.Testing and Inspection: The tubes undergo chemical and mechanical testing to verify compliance with ASTM A501 Grade B standards. Surface quality checks and repairs are also performed.

5.Finishing: The final product may be coated for corrosion protection and marked with essential identification details.

ASTM A501 STEEL TUBE

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