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Hot-Rolled Steel (SS400) Spec Table
Hot-Rolled Steel (SS400) KS Specifications — 15 sizes
KS D 3503
Minimum bend values for SS400 hot-rolled steel plate. Used in thicker gauges (1.6-12mm) than SPCC, requires larger R relative to thickness.
Practical Notes
- Thicker than SPCC (1.6–12mm). Larger R relative to thickness; R ≥ 1.5t recommended above 6mm.
KSHot-Rolled Steel (SS400)
15 sizes| Thickness t | Material | Min R | Min L | Type | Note |
|---|---|---|---|---|---|
| 1.6 | SS400 | 2.4 | 6.7 | Hot Rolled (SS400) | 90° , VForbiddenType Recommended |
| 2.0 | SS400 | 3.0 | 8.4 | Hot Rolled (SS400) | 90° , VForbiddenType Recommended |
| 2.3 | SS400 | 3.5 | 9.7 | Hot Rolled (SS400) | 90° , VForbiddenType Recommended |
| 3.0 | SS400 | 4.5 | 12.6 | Hot Rolled (SS400) | 90° , VForbiddenType Recommended |
| 3.2 | SS400 | 4.8 | 13.4 | Hot Rolled (SS400) | 90° , VForbiddenType Recommended |
| 4.0 | SS400 | 6.0 | 16.8 | Hot Rolled (SS400) | 90° , VForbiddenType Recommended |
| 4.5 | SS400 | 6.8 | 18.9 | Hot Rolled (SS400) | 90° , VForbiddenType Recommended |
| 6.0 | SS400 | 9.0 | 25.2 | Hot Rolled (SS400) | 90° , VForbiddenType Recommended |
| 8.0 | SS400 | 12.0 | 33.6 | Hot Rolled (SS400) | 90° , VForbiddenType Recommended |
| 9.0 | SS400 | 13.5 | 37.8 | Hot Rolled (SS400) | 90° , VForbiddenType Recommended |
| 12 | SS400 | 18.0 | 50.4 | Hot Rolled (SS400) | 90° , VForbiddenType Recommended |
| 16 | SS400 | 24.0 | 67.2 | Hot Rolled (SS400) | 90° , VForbiddenType Recommended |
| 19 | SS400 | 28.5 | 79.8 | Hot Rolled (SS400) | 90° , VForbiddenType Recommended |
| 22 | SS400 | 33.0 | 92.4 | Hot Rolled (SS400) | 90° , VForbiddenType Recommended |
| 25 | SS400 | 37.5 | 105 | Hot Rolled (SS400) | 90° , VForbiddenType Recommended |
Key Features
- Hot-rolled SS400; minimum R differs between mill scale and pickled surface conditions
- Covers thick range t1.6–12 mm; provides bending specs for thicker plates than SPCC
- R ≥ 1.5t (general), R ≥ 2.0t (t > 6 mm) recommended; crack risk increases with thickness
Key Applications
Construction equipment buckets, truck beds, steel brackets, tank shells, heavy equipment covers
FAQ
Minimum bend R for hot-rolled steel?
By thickness: t3.2→R ≥3.2mm (1.0t), t6.0→R ≥9mm (1.5t), t9.0→R ≥18mm (2.0t). Required R increases sharply with thickness.