ASTM Steel Profile Rectangular Tubes

Product Description

1. Excellent Structural Strength & Load-Bearing Capacity

• High Mechanical Performance: Manufactured via cold forming (for most ASTM grades) or hot rolling, with base materials typically low-carbon steel (e.g., A500 Grade B/C) or high-strength low-alloy (HSLA) steel. Key mechanical indicators meet strict ASTM requirements:

• Yield strength: ≥290MPa (A500 Grade B) to ≥345MPa (A500 Grade C);

• Tensile strength: ≥415MPa (Grade B) to ≥485MPa (Grade C);

• Elongation: ≥20% (ensures good ductility to avoid brittle fracture under stress).

• Optimized Rectangular Cross-Section: The rectangular shape provides superior bending stiffness and torsional resistance compared to circular tubes of the same weight. For example, a 100x50mm ASTM rectangular tube (wall thickness 3mm) has a 50% higher bending moment capacity in the longer axis direction than a 70mm-diameter circular tube of equal weight—ideal for structures bearing multi-directional loads (e.g., building beams, bridge guardrails, machinery frames).

2. High Dimensional Precision & Consistent Quality

• Strict Tolerance Control: Adheres to ASTM standards for dimensional accuracy, ensuring reliable fit and assembly:

• Side length tolerance: ±0.5% of the nominal side length (e.g., ±0.25mm for a 50mm side);

• Wall thickness tolerance: ±10% of the nominal thickness (avoids uneven stress caused by thickness variations);

• Straightness: ≤0.5mm/m after precision straightening (prevents installation gaps or misalignment);

• Right-angle accuracy: 90°±1° for tube edges (ensures tight 对接 with other components like steel plates or brackets).

• Standardized Manufacturing & Testing: Each batch undergoes rigorous quality inspections, including dimensional measurement, mechanical property testing (tensile, bending), and surface defect checks (to eliminate scratches, pits, or oxidation scales). For critical applications, additional non-destructive testing (e.g., ultrasonic testing) is available to verify internal structural integrity.

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