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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.

Services
At Aircraft Materials all stock items can be shipped out within 24 hours, usually within the same day. Even cutting orders for bar or sheet can be processed and dispatched the same day, and for time-critical situations such as AOGs, we have a dedicated AOG service desk ready to help (aog@aircraftmaterials.com).

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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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