Non-Corrosion Resisting Steel S99
Technical Data Sheet
| Chemical Composition Limits | |||||||||
| Weight% | C | Si | Mn | P+S max | Cr | Mo | Ni | Other | Al |
| S99 | 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 | 0.34-0.44 | 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 40NiMoCr105 |
0.37-0.43 | 0.15-0.35 | 0.50-0.70 | 0.035 max | 0.60-0.80 | 0.40-0.60 | 2.4-2.7 | - | |
BS S99, along with S98 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 in either the softened condition (5S99D) or hardened and tempered (5S99G).
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 |
| 3S99D | Solution Annealed | - | - | - | 277 max | - |
| 3S99G | Hardened and Tempered | 1230-1420 | 1080 | 10 | 363-415 | 6" |
Availability
Alloy S99 is available in Bar . For all stock availability contact Sales.
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.
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