SAPH370 Hot Rolled Steel Coil for Automotive Structural Uses
SAPH370 Hot Rolled Steel Coil for Automotive Structural Uses - JIS G3113 & Q/BQB 310
Detailed analysis of SAPH370 hot rolled steel coil according to Q/BQB 310-2009 and JIS G3113-2006, including chemical composition, mechanical and physical properties, equivalents, and application guide.
Hot rolling, Pickling, Cutting, Forming, Welding
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SAPH370 Hot Rolled Steel Coil for Automotive Structural Uses Introduction
SAPH370 is a hot-rolled steel grade specified in JIS G3113 (and Q/BQB 310) designed for automotive structural parts requiring good formability and weldability. It offers a minimum tensile strength of 370 MPa and a minimum yield strength of 225 MPa. Typical application includes frames, wheels, and suspension components.
SAPH370 Hot Rolled Steel Coil for Automotive Structural Uses Chemical Composition
The chemical composition is according to JIS G3113-2006 for SAPH370. Maximum limits apply except aluminum which shall be ≥0.01% to ensure fine grain and deoxidation.
| Element | Standard Value | Remarks |
|---|---|---|
| C | ≤0.21% | |
| Si | ≤0.25% | |
| Mn | ≤0.75% | |
| P | ≤0.030% | |
| S | ≤0.030% | |
| Al | ≥0.01% | Optional, but usually added for grain refinement |
SAPH370 Hot Rolled Steel Coil for Automotive Structural Uses Thermal and Electrical Physical Properties
Typical values for low-carbon steel, not part of the standard specification. These can vary with actual chemistry and processing.
| Property | Typical Value | Unit | Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm3 | At 20°C |
| Elastic Modulus (E) | 200 | GPa | At room temperature |
| Shear Modulus (G) | 80 | GPa | At room temperature |
| Poisson's Ratio (ν) | 0.3 | - | At room temperature |
| Thermal Expansion Coefficient (α) | 1.2×10-5 | /°C | 20~100°C |
| Thermal Conductivity (λ) | 50 | W/(m·K) | At 20°C |
| Specific Heat Capacity | 460 | J/(kg·K) | At 20°C |
| Electrical Resistivity (ρe) | 1.4×10-7 | Ω·m | At 20°C |
SAPH370 Hot Rolled Steel Coil for Automotive Structural Uses Mechanical Properties
Mechanical properties as per JIS G3113-2006 for hot rolled steel. Tensile test specimens according to JIS Z2241. For thickness t < 3.2 mm, JIS No.5 specimen; t 3.2~6.0 mm, JIS No.5; t ≥ 6.0 mm, JIS No.1A.
| Property | Standard Required Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥225 | MPa | As-rolled, applicable to all thicknesses |
| Tensile Strength (Rm) | ≥370 | MPa | |
| Elongation (A) | ≥31 | % | Thickness < 3.2 mm (JIS No.5) |
| Elongation (A) | ≥32 | % | Thickness 3.2 to <6.0 mm (JIS No.5) |
| Elongation (A) | ≥33 | % | Thickness ≥6.0 mm (JIS No.1A) |
| Bend Test (Bend Angle 180°) | r = 0.5 t | - | Thickness ≤3.2 mm |
| Bend Test (Bend Angle 180°) | r = 1.0 t | - | Thickness >3.2 mm |
SAPH370 Hot Rolled Steel Coil for Automotive Structural Uses Fully Equivalent Material Standards and Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G3113 | SAPH370 | Original standard |
| South Korea | KS D 3515 | SPH370 | Equivalent to JIS G3113 |
| China (Baosteel) | Q/BQB 310 | SAPH370 | Enterprise standard, identical to JIS G3113 |
SAPH370 Hot Rolled Steel Coil for Automotive Structural Uses Application Introduction
SAPH370 is widely used in automotive manufacturing for structural parts that require a combination of strength, formability, and weldability. It is suitable for components that undergo moderate forming operations and spot welding. The steel can be formed into various shapes by bending, drawing, and stretch forming.
Product Applications: Passenger cars, Light trucks, Bus frames, Agricultural vehicles
Processed into products: Cross members, Longitudinal beams, Wheel spokes, Suspension arms, Brackets, Mounting plates, Chassis reinforcements
Application industries: Automotive, Transportation, Construction Machinery
SAPH370 Hot Rolled Steel Coil for Automotive Structural Uses Similar Substitute Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G3113 | SAPH400 | Higher strength, lower elongation; may require adjustment in forming |
| Europe | EN 10149-2 | S315MC | High-strength low-alloy steel with similar yield strength, suitable for cold forming |
| China | GB/T 3273 | 370L | Automotive frame steel, similar strength but different chemical composition and formability |
Notes:
For pickled and oiled condition, the mill scale is removed, providing a clean surface for subsequent welding or painting. SAPH370 is not intended for heat treatment; mechanical properties are achieved in the hot-rolled condition. Welding can be performed by all conventional methods. Consult standard for tolerances on dimensions and shape.
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