Technical Data Sheet
BS S98, along with S99 is the British aerospace equivalent of 826M40. A 2 1/2% Nickel-Chrome-Moly high carbon steel, it is available in bars and forgings. S98 is generally supplied as bright bar for machining, in the finally heat treated and cold drawn/groun condition, designated BS S98D. Other conditions are S98B (black bar for machining, finally heat treated), S98A (billets for forging, softened) and S98C (forgings, finally heat treated).
| Chemical Composition Limits | |||||||||
| Weight% | C | Si | Mn | P+S max | Cr | Mo | Ni | Other | Al |
| 2S98 | 0.36-0.44 | 0.10-0.35 | 0.45-0.70 | P 0.025 S 0.020 |
0.50-0.80 | 0.45-0.65 | 2.30-2.80 | – | 0.015-0.050 |
| Chemically similar British Specifications BS.970 Pt2 | |||||||||
| Weight% | C | Si | Mn | P+S max | Cr | Mo | Ni | Other | |
| 826M40 | 0.36-0.44 | 0.10-0.35 | 0.45-0.70 | P 0.040 S 0.050 |
0.50-0.80 | 0.45-0.65 | 2.30-2.80 | – | |
| EN26 | 0.36-0.44 | 0.10-0.35 | 0.50-0.70 | – | 0.50-0.80 | 0.40-0.70 | 2.30-2.80 | – | |
| Other Chemically similar Specifications | |||||||||
| Weight% | C | Si | Mn | P+S max | Cr | Mo | Ni | Other | |
| WS 1.6745 | 0.37-0.43 | 0.15-0.35 | 0.50-0.70 | 0.035 | 0.60-0.80 | 0.40-0.60 | 2.40-2.70 | – |
Typical Mechanical Properties
| Grade | Treatment | Tensile Strength Rm tonf/in² | Proof Stress Rp 0.2, tonf/in² | Elongation in 5.65 √Cross Sectional Area% | Hardness HB | Ruling Section |
| 3S98 | Solution Annealed | – | – | – | 277 max | – |
| 2S98D | Hardened and Tempered | 75-85 | 65 | 10 | 341-388 | 6" |
Availability
Alloy S98 is available in Bar . For all stock availability contact Sales.