ASME SA283 Grade B (SA283 GRB) Carbon Steel Plate
ASME SA283 Grade B (SA283 GRB) Carbon Steel Plate: Properties, Equivalents & Applications
Comprehensive material data for ASME SA283 Grade B carbon steel plate: chemical composition, mechanical and physical properties, international equivalents, similar grades, and application guidelines.
Welding, cold/hot forming, machining, shearing, punching, drilling
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ASME SA283 Grade B Carbon Steel Plate Introduction
ASME SA283 Grade B (SA283 GRB) is a carbon steel plate grade specified under the ASME SA283/SA283M standard for low and intermediate tensile strength structural applications. It is essentially identical to ASTM A283 Grade B. Typical delivery condition is as-rolled, with good weldability and formability due to its low carbon content.
- Moderate strength: tensile 345–450 MPa, yield min 185 MPa
- Excellent weldability without preheating for moderate thicknesses
- Used in construction, bridges, storage tanks, and general machinery
- Available in plates, sheets, and strips
ASME SA283 Grade B Carbon Steel Plate Chemical Composition
Based on ASME SA283/SA283M standard. Residual elements not listed may be present within normal limits. Copper may be specified at a minimum of 0.20% when required by the purchase order.
| Element | Limit | Notes |
|---|---|---|
| Carbon (C) | 0.17 max | |
| Manganese (Mn) | 0.90 max (1.20 max for thickness > 1 in. [25 mm]) | Plates over 1 in. use higher limit |
| Phosphorus (P) | 0.030 max | |
| Sulfur (S) | 0.030 max | |
| Copper (Cu) | 0.20 min (when specified) | Optional per purchase order |
ASME SA283 Grade B Carbon Steel Plate Thermal and Electrical Physical Properties
These values are not mandated by ASME SA283 but are typical for low‑carbon structural steel. They may vary with temperature and exact chemistry.
| Property | Value | Unit | Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | Room temperature |
| Elastic Modulus (E) | 200 | GPa | Room temperature |
| Shear Modulus (G) | 80 | GPa | Calculated |
| Poisson's Ratio (ν) | 0.29 | — | — |
| Thermal Expansion Coefficient (α) | 11.7 | 10-6/°C | 20–100 °C range |
| Thermal Conductivity (λ) | 52 | W/m·K | at 20 °C |
| Specific Heat Capacity (c) | 486 | J/kg·K | at 20 °C |
| Electrical Resistivity (ρe) | 0.14 | 10-6 Ω·m | Room temperature |
ASME SA283 Grade B Carbon Steel Plate Mechanical Properties
Tensile properties as specified in the standard. Elongation is measured on an 8 in. (200 mm) gauge length. Bending tests are not mandatory unless specified by the purchaser.
| Property | Value | Unit | Condition |
|---|---|---|---|
| Yield Strength (ReH) | 185 min | MPa | All plate thicknesses |
| Tensile Strength (Rm) | 345–450 | MPa | All plate thicknesses |
| Elongation (A200) | 25 min | % | Thickness ≤ 3/4 in. (20 mm) |
| Elongation (A200) | 24 min | % | Thickness > 3/4 to 1-1/2 in. (20–40 mm) |
| Elongation (A200) | 23 min | % | Thickness > 1-1/2 to 4 in. (40–100 mm) |
| Elongation (A200) | As agreed | % | Thickness > 4 in. (100 mm) |
ASME SA283 Grade B Carbon Steel Plate Fully Equivalent Material Standards and Replaceable Grades
| Country/Region | Standard | Grade | Notes |
|---|---|---|---|
| USA | ASTM A283/A283M | Grade B | Identical to ASME SA283 Grade B – the same chemical and mechanical requirements |
ASME SA283 Grade B Carbon Steel Plate Application Introduction
SA283 Grade B is a workhorse material for structural construction and machinery. Its moderate strength and excellent fabrication characteristics make it suitable for a wide range of welded assemblies. It is not intended for pressure vessel shells or high‑temperature service without additional qualification.
Product Applications: Structural frameworks for buildings, Welded beams and columns, Low‑pressure storage tanks, Machine frames and bases, Support structures and platforms, Pipe support plates and saddles
Processed into products: Base plates and sole plates, Gusset plates and stiffeners, Flanges (non‑critical, low‑pressure), Brackets and mounting pads, Machinery parts (non‑heat‑treated), Shear tabs and connection plates
Application industries: Construction & Civil Engineering, Bridge Building, Machinery Manufacturing, Shipbuilding (secondary structures), Storage Tanks and Silos, Platforms and Walkways
ASME SA283 Grade B Carbon Steel Plate Similar or Alternative Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| European Union | EN 10025-2 | S235JR | Yield min 235 MPa, tensile 360–510 MPa – slightly higher strength, common substitute |
| Japan | JIS G3101 | SS400 | Yield min 245 MPa, tensile 400–510 MPa – general structural rolled steel |
| China | GB/T 700 | Q235B | Yield min 235 MPa, tensile 370–500 MPa – widely used carbon structural steel |
| International | ISO 630-2 | E235B | Yield min 235 MPa, tensile 360–510 MPa – comparable to S235JR |
Notes:
Fabrication notes: SA283 Grade B plates are normally supplied in the as‑rolled condition. The low carbon content ensures excellent cold forming and hot forming possibilities. All common welding methods can be used; for thicknesses exceeding 1 in. (25 mm), low‑hydrogen electrodes and preheating may be recommended to avoid cracking. The material is not designed for high‑temperature or pressure‑retaining applications unless additional testing is performed. When specified, copper content (≥0.20%) provides some improvement in atmospheric corrosion resistance.
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