1. Standards
| Designation |
Thickness Range (mm) |
Characteristics |
| Hardness |
Performances in Fabrication and Service |
| SUMIHARD-K340 |
6~100 |
Target: HB340 |
Consideration of workability and weldability |
| SUMIHARD-K400 |
6~100 |
Target: HB400 |
Excellent abrasion resistance, with special consideration of weldability |
| SUMIHARD-K500 |
6~50 |
Target :HB500 |
With consideration of weldability, especially excellent abrasion resistance |
Steel plates with hardness outside the above specifications may be manufactured. Please consult us for further information.
2. Specified Properties
Chemical Composition
| Designation |
C |
Si |
Mn |
P |
S |
B |
Pcm |
| t ≤ 25 |
t > 25 |
| SUMIHARD-K340 |
≤ 0.21 |
≤ 0.70 |
≤ 1.60 |
≤ 0.025 |
≤ 0.010 |
≤ 0.0030 |
≤ 0.30 |
≤ 0.35 |
| SUMIHARD-K400 |
≤ 0.21 |
≤ 0.70 |
≤ 1.60 |
≤ 0.025 |
≤ 0.010 |
≤ 0.0030 |
≤ 0.30 |
≤ 0.35 |
| SUMIHARD-K500 |
≤ 0.35 |
≤ 0.70 |
≤ 1.60 |
≤ 0.025 |
≤ 0.010 |
≤ 0.0030 |
≤ 0.42 |
≤ 0.42 |
As is required, alloying elements other than the above may be added.
Hardness
| Designation |
SUMIHARD-K340 |
SUMIHARD-K400 |
SUMIHARD-5340 |
| SUMIHARD-K340 |
320~360 |
360~440 |
450~550 |
Brinell hardness is a mean value of 3 points measured on the surface of a steel plate. The surface to be measured is machined at 0.7mm, thus removing a decarburized layer.
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