Aircraft Steel BS S98 / 2S98D (826M40)
Technical Data Sheet
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 | - |
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).
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.
What's new.......... More News ........ COVID-19 Statement (read full statement here) |
|
Disclaimer
Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.