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ASTM A500 Stainless Steel Square Pipe Grade B Structural Square Hollow Section

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ASTM A500 Stainless Steel Square Pipe Grade B Structural Square Hollow Section

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Brand Name : Baosteel，TISCO

Model Number : 201 / 202 / 301 / 302 / 303 / 304 / 304L / 305 / 309S / 310S / 316 / 316L / 317 / 317L / 321 / 347 / 409L / 410 / 420 / 430 / 440C / 2205 / 2507

Certification : EN 10204 Type 3.1 / 3.2 available

Place of Origin : MADE IN CHAINA

MOQ : 100kg

Price : Negotiable (Request a Quote)

Payment Terms : T/T，D/P，D/A，Western Union，PayPal

Supply Ability : 10000tons

Delivery Time : 15-25days

Packaging Details : Wooden pallets, wooden crates, woven bags, etc.

Country of Origin : MADE IN CHAINA

Brand : Baosteel，TISCO

Certifications : ISO/EN 10204 Type 3.1 / 3.2 available

Grade : 201 / 202 / 301 / 302 / 303 / 304 / 304L / 305 / 309S / 310S / 316 / 316L / 317 / 317L / 321 / 347 / 409L / 410 / 420 / 430 / 440C / 2205 / 2507 / 630 (17-4PH)

MOQ : 100kg

Packaging : Wooden Case / Wooden Pallet / Steel Frame / Carton / Woven Bag

Supply Capacity : 10000tons

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What Is ASTM A500?

ASTM A500 is the American standard for cold-formed welded and seamless carbon steel structural tubing in round, square, and rectangular shapes. It is the go-to specification for structural applications where strength, weldability, and economy are required.

Square steel tubes under ASTM A500 are produced as cold-formed welded tubes, then heat-treated to remove internal stresses and improve mechanical properties. The standard covers four grades: A, B, C, and D – with Grade B and Grade C being the most commonly used.

Quick Facts Value
Standard ASTM A500
Shape Square
Process Cold-formed + welded + heat treated
Key Feature High strength-to-weight ratio
Primary Use Structural framing, columns, trusses
Common Grades Grade B, Grade C
Chemical Composition

ASTM A500 specifies chemical requirements for each grade. Below are the limits per the standard.

Element Grade A Grade B Grade C Grade D
Carbon (C) ≤ 0.26 ≤ 0.26 ≤ 0.23 ≤ 0.27
Manganese (Mn) ≤ 1.35 ≤ 1.35 ≤ 1.35 ≤ 1.40
Phosphorus (P) ≤ 0.035 ≤ 0.035 ≤ 0.035 ≤ 0.035
Sulfur (S) ≤ 0.035 ≤ 0.035 ≤ 0.035 ≤ 0.035
Copper (Cu) ≥ 0.20 (when specified) ≥ 0.20 (when specified) ≥ 0.20 (when specified) ≥ 0.20 (when specified)

Notes:

  • Grade D has more restrictive carbon equivalent (CE) requirements for improved weldability
  • Copper is required only when the order specifies atmospheric corrosion resistance

Grade Selection Guide:

Grade Strength Level Typical Use
Grade A Lowest Light structural, non-critical applications
Grade B Medium (most common) General structural framing, columns, braces
Grade C Highest Heavy structural, high-load applications
Grade D High + improved weldability Cold-temperature and welded structures
Mechanical Properties

ASTM A500 specifies minimum mechanical properties that vary by grade and tube wall thickness.

Tensile Requirements
Grade Tensile Strength (MPa) Yield Strength (MPa) Elongation (%)
Grade A ≥ 310 ≥ 230 ≥ 25
Grade B ≥ 400 ≥ 315 ≥ 23
Grade C ≥ 425 ≥ 345 ≥ 21
Grade D ≥ 400 ≥ 250 ≥ 23

Elongation requirements apply to 50 mm (2 inches) gauge length. Actual values vary by wall thickness – thinner walls may have lower elongation.

Comparison by Grade
Grade Strength Weldability Cost Best For
B Medium Excellent Low General construction (most popular)
C High Good Medium Heavy structural, high-load frames
D Medium-High Excellent (low CE) Medium Cold-temperature welded structures
A Low Excellent Lowest Light-duty, non-critical
Dimensional Tolerances (ASTM A500)
Parameter Typical Tolerance
Outside dimensions ± 0.5 mm to ± 1.0 mm (size dependent)
Wall thickness ± 10%
Straightness ≤ 1/8" per 5' (≈ 2.0 mm per meter)
Twist ≤ 2° + 0.5° per meter
Corner radius 2× to 3× wall thickness (typical)
Standard Size Range (Square Tube)
Size (mm) Common Wall Thickness (mm)
20 × 20 1.5, 2.0
40 × 40 2.0, 2.5, 3.0
50 × 50 2.5, 3.0, 4.0
80 × 80 3.0, 4.0, 5.0
100 × 100 3.0, 4.0, 5.0, 6.0
150 × 150 4.5, 5.0, 6.0, 8.0
200 × 200 6.0, 8.0, 10.0

Custom sizes available upon request.

Applications

Primary Use: Structural framing and building construction

Other Applications:

  • Building columns and beams
  • Trusses and roof supports
  • Machinery frames and platforms
  • Trailers and truck bodies
  • Agricultural equipment
  • Sign posts and billboard structures
  • Handrails and guardrails
  • Solar panel mounting structures

Quick Pick:

Need Choose
General building construction ASTM A500 Grade B
Heavy structural/high load ASTM A500 Grade C
Cold-temperature welded structures ASTM A500 Grade D
Light-duty / non-critical ASTM A500 Grade A
Quality Assurance

Every ASTM A500 square tube we supply meets strict quality standards.

Testing & Inspection
Test Purpose
Chemical analysis Verify composition per standard
Tensile test Confirm yield and tensile strength
Flattening test Assess ductility and weld quality
Reverse flattening test Check weld soundness
Hydrostatic test (When specified) – not typically required for structural
Dimensional inspection Verify OD, wall thickness, straightness, twist
Visual inspection Check surface defects and weld appearance
Certifications
  • EN 10204 Type 3.1 – Mill test certificate (standard)
  • EN 10204 Type 3.2 – Third-party verified (available on request)
  • Full traceability – Heat number traceable
Surface Finish
  • Mill finish (dark gray/black oxide)
  • Primer coated (available on request)
  • Galvanized (available on request)
Why Choose Us?
Advantage Detail
Stock availability Common sizes in stock
Custom cutting Cut to exact lengths
Fabrication services Drilling, welding, and painting are available
Competitive pricing Direct from the mill
Global shipping Door-to-door delivery
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