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ASTM A572 standard includes five different grades of steel: A572-42, A572-50, A572-55, A572-60, and A572-65. These grades represent the minimum yield strength and tensile strength requirements essential for structural applications.
Different grades meet the strength requirements of various engineering projects. A572-42 indicates a minimum yield strength of 42 ksi, while A572-50 represents 50 ksi, moving up to A572-65 with a yield strength of 65 ksi. The selection depends on the specific performance requirements of the machinery or construction project.



| Product Name | Alloy Structural Steel Tube |
|---|---|
| Standard | ASTM A106/A53, ASTM A519, JIS, DIN 2391, EN10305, SA335, etc. |
| Material | 40Cr, 45#, 20#, 1045, 4130, 4140, 16Mn, 42CrMO, etc. |
| Outer Diameter | 25 - 545 mm |
| Wall Thickness | 2.5 - 120 mm |
| Technology | Hot Rolled / Hot Expanded / Cold Drawn |
| Application | Structure pipe, Boiler tube, Liquid delivery, Petroleum cracking |
| Grade | C (max.%) | Mn (max.%) | P (max.%) | S (max.%) |
|---|---|---|---|---|
| 50 [345] | 0.23 | 1.35D | 0.04 | 0.05 |
| Material Properties | Yield Point min [MPa] | Tensile Strength min [MPa] | Elongation % |
|---|---|---|---|
| A572 Gr 50 | 345 | 450 | 65 (ksi) / 18-21% |








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