ASME SA283 Grade B Carbon Steel Coil
ASME SA283 Grade B Carbon Steel Coil - Properties, Equivalents & Applications
Comprehensive material data for ASME SA283/SA283M Grade B carbon steel coil: chemical composition, mechanical & physical properties, international equivalents, and application guidance for structural and general engineering uses.
Cutting, welding, cold forming, bending, punching, machining, hot-dip galvanizing
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ASME SA283 Grade B Carbon Steel Coil Introduction
ASME SA283/SA283M Grade B is a low and intermediate tensile strength carbon steel intended for structural applications. It is supplied as hot-rolled coils, sheets or plates and is widely used in welded, bolted and riveted constructions. Grade B offers good weldability and formability combined with moderate strength.
- Minimum yield strength: 185 MPa (27 ksi)
- Tensile strength range: 345–485 MPa (50–70 ksi)
- Available in thicknesses up to several hundred millimetres
- Excellent value for general structural purposes
ASME SA283 Grade B Carbon Steel Coil Chemical Composition
The composition limits for ASME SA283 Grade B vary slightly with product thickness. Carbon and manganese maxima are controlled to ensure good weldability. Phosphorus and sulfur are restricted to maintain toughness. Silicon is not generally specified for semi-killed or rimmed practice but may be reported for killed steel.
| Element | Standard Value (%) | Remarks |
|---|---|---|
| C | ≤0.17 (thickness ≤40 mm) ; ≤0.20 (thickness >40–100 mm) ; ≤0.20 (thickness >100 mm) | Ladle analysis; further restricted for improved weldability if agreed |
| Mn | ≤0.90 (thickness ≤100 mm); ≤1.00 (thickness >100 mm) | Ladle analysis |
| P | ≤0.035 | Ladle analysis |
| S | ≤0.035 | Ladle analysis |
| Si | 0.15–0.30 (if killed steel is ordered); otherwise not specified | For non-killed (rimmed/capped) grades, Si is usually ≤0.10% |
ASME SA283 Grade B Carbon Steel Coil Thermal and Electrical Physical Properties
The following physical properties are typical for carbon steel of this grade, not specified by ASME SA283. They apply at room temperature unless otherwise noted and are provided for design and material selection. Actual values may vary slightly with processing history and test methods.
| Property | Typical Value | Unit | Test Condition / Remark |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20 °C |
| Modulus of elasticity (E) | 200–210 | GPa | At 20 °C |
| Shear modulus (G) | 79–81 | GPa | Calculated from E and ν |
| Poisson's ratio (ν) | 0.27–0.30 | – | At 20 °C |
| Coefficient of thermal expansion (α) | 11.7 | 10⁻⁶/K | 20–100 °C |
| Thermal conductivity (λ) | 52 | W/(m·K) | At 20 °C |
| Specific heat capacity (Cp) | 0.486 | J/(g·K) | At 20 °C |
| Electrical resistivity (ρe) | 0.15–0.20 | µΩ·m | At 20 °C |
ASME SA283 Grade B Carbon Steel Coil Mechanical Properties
Tensile properties and bend test requirements are specified by thickness ranges in ASME SA283/SA283M. All values are minimum unless a range is given. The bend test ensures ductility for cold forming. Impact testing is not mandatory unless specified in the purchase order; typical Charpy V-notch values at room temperature can be between 27 and 50 J for thicknesses up to 50 mm.
| Property | Standard Requirement | Unit | Test Condition / Thickness Range |
|---|---|---|---|
| Yield strength (ReH) min. | 185 | MPa | All thicknesses |
| Tensile strength (Rm) | 345–485 | MPa | All thicknesses |
| Elongation after fracture (A), 50 mm gauge | ≥22 | % | Thickness ≤20 mm |
| Elongation after fracture (A), 50 mm gauge | ≥21 | % | Thickness >20–40 mm |
| Elongation after fracture (A), 50 mm gauge | ≥20 | % | Thickness >40–50 mm |
| Elongation after fracture (A), 50 mm gauge | ≥18 | % | Thickness >50–100 mm |
| Elongation after fracture (A), 200 mm gauge | ≥18 | % | Thickness >100 mm (by agreement) |
| Bend test (180°) – bend diameter | 0.5 t | – | Thickness ≤40 mm |
| Bend test (180°) – bend diameter | 1.0 t | – | Thickness >40–50 mm |
| Bend test (180°) – bend diameter | 1.5 t | – | Thickness >50–100 mm |
| Bend test (180°) – bend diameter | 2.0 t | – | Thickness >100 mm |
ASME SA283 Grade B Carbon Steel Coil Direct Equivalent Material Standards and Substitutable Grades
| Country / Region | Standard | Grade | Remark |
|---|---|---|---|
| USA | ASTM A283/A283M | Grade B | Identical standard (ASME SA283 is derived from ASTM A283). Fully interchangeable. |
| Europe | EN 10025-2 | S235JR (1.0038) | Closest EN equivalent; minor differences in Mn and elongation limits. Verify thickness-dependent properties. |
| Japan | JIS G3101 | SS400 | Almost equivalent; SS400 guarantees tensile ≥400–510 MPa, yield ≥245 MPa (thickness ≤16 mm). Commonly used as substitute. |
| China | GB/T 700 | Q235B | Chemical composition and mechanical properties similar, widely accepted as substitute. |
| International | ISO 630-2 | Fe 360B (S235B) | Comparable structural steel under ISO system. |
ASME SA283 Grade B Carbon Steel Coil Application Introduction
ASME SA283 Grade B is a workhorse structural steel used in a variety of general engineering and construction applications. Its good weldability, machinability, and balance of strength and ductility make it suitable for numerous components. Typical industries and products include:
Product Applications: Welded structural steel coils and plates for commercial fabrication, Tanks and silos for water, oil and general liquid storage, Light to medium duty crane beams and gantry girders, Steel pipes and hollow sections (ERW) for structural and mechanical use, Floor plates, grating and stair treads
Processed into products: Columns and beams in low-rise steel frames, Base plates, stiffeners and gussets, Agricultural equipment parts: plow beams, cultivator frames, Vehicle chassis, cross members and brackets, Storage rack uprights and shelf panels, Walkways, railing systems and support angles
Application industries: Construction & Infrastructure (bridges, building frames, platform structures), Transportation (railcar frames, trailer bodies, automotive structural parts), Energy (storage tanks, pressure vessel shells subject to low stress, wind tower internal components), Machinery & Equipment (agricultural machinery, conveyors, scaffolding), Shipbuilding (secondary structural members, decks, bulkheads)
ASME SA283 Grade B Carbon Steel Coil Near-Substitute and Similar Materials
| Country / Region | Standard | Grade | Remark |
|---|---|---|---|
| USA | ASTM A36/A36M | A36 | Higher yield strength (≥250 MPa) and tensile (400–550 MPa); frequently used for structural shapes and plates. Can replace SA283 Gr. B where greater strength is needed. |
| Europe | EN 10025-2 | S275JR (1.0044) | Higher strength grade (yield ≥275 MPa), used for similar applications; needs verification of ductility and weldability. |
| Japan | JIS G3101 | SS330 | Lower strength variant, similar to Grade A or light structural applications; might be used where lower mechanical demands exist. |
| China | GB/T 700 | Q195 / Q215 | Lower carbon and strength; could be considered for non-structural parts or where SA283 Gr. B is over-specified. |
Notes:
Additional remarks:
- For ASME boiler and pressure vessel code construction, the material must be used within the design limits specified in ASME Section II, Part D. Grade B is acceptable for moderate temperature service, typically below 370 °C.
- Welding procedures should follow AWS D1.1 or ASME Section IX. Low-hydrogen electrodes are recommended for thicker sections to avoid hydrogen-induced cracking.
- If improved impact toughness is required, the steel can be supplied in killed condition with optional Charpy testing; this must be explicitly ordered.
- Surface finish and flatness tolerances comply with ASME SA6/SA6M. Coil products may exhibit slight spring-back after uncoiling.
- This grade is not intended for heat treatment quenching and tempering; typical applications are in the as-rolled or normalized condition.
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