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Aircraft Steel BS S106 / 4S106D (MSRR 6001)
Technical Data Sheet
BS s106 is the British aerospace equivalent of 722M24 / EN40B. It is a medium strength 3% Chrome-Moly nitriding steel that develops high hardness after heat treatment, and is used in both aerospace applications and motorsports industries. It is generally supplied as bright bar in the hardened, tempered and stress relieved condition, designated S106D. It can also be supplied to the Rolls Royce specification MSRR 6001.
| Chemical Composition Limits | ||||||||
| Weight% | C | Si | Mn | P+S max | Cr | Mo | Ni | Sn |
| 3S106 | 0.20-0.28 | 0.10-0.35 | 0.40-0.70 | 0.020 | 3.00-3.50 | 0.45-0.65 | 0.30 max | 0.030 max |
| 4S106 | 0.20-0.28 | 0.10-0.35 | 0.40-0.70 | 0.020 | 3.00-3.50 | 0.50-0.70 | 0.30 max | 0.030 max |
| Chemically similar British Specifications BS.970 Pt2 | ||||||||
| Weight% | C | Si | Mn | P+S max | Cr | Mo | Ni | - |
| 722M24 | 0.20-0.28 | 0.10-0.35 | 0.45-0.70 | 0.025 | 3.00-3.50 | 0.45-0.65 | - | - |
| EN40B | 0.20-0.30 | 0.10-0.35 | 0.40-0.65 | 0.050 | 2.90-3.50 | 0.40-0.70 | 0.40 max | - |
| Other Chemically similar Specifications | ||||||||
| Weight% | C | Si | Mn | P+S max | Cr | Mo | Ni | Sn |
| WS 1.7365 | 0.25-0.30 | 0.15-0.25 | 0.60-0.80 | 0.035 max | 3.00-3.30 | 0.45-0.550 | - | - |
Typical Mechanical Properties
| Grade | Treatment | Tensile Strength Rm N/mm² | Proof Stress Rp 0.2, N/mm² | Elongation in 5.65 √Cross Sectional Area% | Hardness HB | Ruling Section |
| S106 | Solution Annealed | - | - | - | 269 max | - |
| S106D | Hardened and Tempered | 930/1080 | 740 | 35 | 269/321 | 6" |
Availability
Alloy S106 is available in Bar . For all stock availability contact Sales.
