BÖHLER V118S1 is a premium aircraft-quality, low-alloy Ni-Cr-Mo steel in the form of bars, forgings and forging stock requiring high tensile and toughness values, particular in large cross sections in the hardened and tempered condition. The molybdenum addition prevents the steel from being susceptible to temper brittleness.
These products have been used typically for parts requiring a through-hardening capability up to 6 inches (152,4 mm) in nominal thickness at time of heat treatment but usage is not limited to such applications.
特に焼入れ-焼戻し状態で，高い抗張力と靱性を必要とする大断面部材用のクロム-ニッケル-モリブデン鋼。モリブデン添加により，材料が焼戻し脆性の影響を受け易くなるのを防止します。
| SEL | 市中材料 |
|---|---|
| 1.6745 | S98 |
| BS | BS |
|---|---|
| S98 | S99 |
| C | Si | Mn | P | S | Cr | Mo | Al | |
|---|---|---|---|---|---|---|---|---|
| 0.36 to 0.44 | 0.10 to 0.35 | 0.45 to 0.7 | max. 0.025 | max. 0.015 | 0.5 to 0.8 | 0.45 to 0.65 | 0.015 to 0.050 |
