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Aircraft Steel BS S98 / 2S98D (826M40)

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.

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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.