Aircraft Steel BS S154 / S154D (MSRR 6043)

Technical Data Sheet

BS S154 is a 2.5% Nickel-chrome-moly steel, and the British aerospace equivalent ot 826M31 (EN25). It is generally supplied as bright bar in the finally heat treated and cold drawn/groun condition, designated S154D.

Chemical Composition Limits
Weight%	C	Si	Mn	P+S max	Cr	Mo	Ni	Al
2S96	0.27-0.35	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
S154	0.27-0.35	0.15-0.35	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
826M31	0.27-0.35	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
EN25	0.27-0.35	0.10-0.35	0.50-0.70	–	0.50-0.80	0.40-0.65	2.30-2.80
Other Chemically similar Specifications
Weight%	C	Si	Mn	P+S max	Cr	Mo	Ni
UNI 30NiCrMo12	0.27-0.35	0.40 max	0.50-0.80	0.035	0.60-1.00	0.30-0.60	2.60-3.20

 

Typical Mechanical Properties

Grade	Treatment	Tensile Strength Rm , N/mm²	Proof Stress Rp 0.2, N/mm²	Elongation in 5.65 √Cross Sectional Area%	Hardness HB	Ruling Section
S154D	Solution Annealed	–	–	–	248 max
S154D	Hardened and Tempered	880-1080	690	12	255-321	6"

Availability
Alloy S154 is available in Bar. For all stock availability contact Sales.