What is ASTM A572 Grade 42 Carbon Steel Plate
ASTM A572 Grade 42 is a high-strength low-alloy (HSLA) steel engineered for structural purposes, offering a balance between strength and cost without compromising ductility. Alloyed with columbium (niobium) and vanadium, it exhibits excellent formability.
Commonly applied in bridge steel plates for short-span structures and structural components in low-rise buildings, this grade efficiently handles static loads. As a fundamental carbon steel plate, it is suitable for welded or bolted assemblies in general machinery and light tower constructions.
Gnee's A572 Grade 42 plates comply with ASTM specifications, ensuring consistent performance for entry-level structural projects.
Chemical Composition of ASTM A572 Gr.42
The chemical formulation of ASTM A572 Gr.42 is optimized for weldability and moderate strength. Typical composition:
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.21 |
| Manganese (Mn) | ≤ 1.35 |
| Phosphorus (P) | ≤ 0.04 |
| Sulfur (S) | ≤ 0.05 |
| Silicon (Si) | ≤ 0.40 |
| Vanadium (V) | 0.01–0.15 |
| Columbium/Niobium (Nb) | 0.005–0.05 |
| Copper (Cu) (optional) | ≥ 0.20 |
This low-carbon composition allows easy welding, while the alloying elements enhance mechanical properties and overall performance stability.
Mechanical Properties of ASTM A572 Grade 42
ASTM A572 Grade 42 delivers reliable mechanical performance for general structural applications:
| Property | Value |
|---|---|
| Minimum Yield Strength | 290 MPa (42 ksi) |
| Tensile Strength | ≥ 415 MPa (60 ksi) |
| Elongation (200mm) | ≥ 20% |
| Elongation (50mm) | ≥ 24% |
| Charpy Impact (0°C, optional) | ≥ 27 J |
These properties provide adequate strength while maintaining good ductility for light structures.
International Equivalent Grades of ASTM A572 Gr.42
| Standard | Equivalent Grade |
|---|---|
| EN 10025 | S275JR / S275J0 |
| DIN | St44-3 |
| JIS | SS490 |
| GB | Q275B |
| BS | 43A / 43B |
These equivalents facilitate international procurement and comparison.
Applications of ASTM A572 Grade 42 Steel Plate
Lightweight bridges
Low-rise buildings
General machinery and fabrication
Its balanced properties make it ideal for general-purpose structural steel projects.
