The U10A grade refers to high-quality steel. The letter "U" at the beginning of the marking stands for "carbon steel," and the letter "A" at the end signifies high-quality steel. U10A is known as clean steel, free from alloy banding, suitable for differential hardening (Hamon). Its low manganese content allows for distinct features (choji).
- Good hardenability during heat treatment
- High surface hardness
- Good stability after heat treatment
Chemical Composition
C |
Mn |
Si |
P |
S |
Cr |
Ni |
Cu |
0.97% |
0.21% |
0.22% |
0.006% |
0.009% |
0.26% |
0.21% |
0.18% |
Hardening
| Temperature | Soaking Time | Hrc |
| 780 - 810°C | 1.5 minutes per mm | 67 |
Recommended temperature for hamon: 790°C
Suggested Quenching Oil:Durixol V35 60°C
Tempering:
2 times for 40 minutes
| Temperature | Hrc |
| 150°C | 64 |
| 200°C | 61 |
| 260°C | 59 |
| 315°C | 55 |