Aircraft Steel BS S154 / S154D (MSRR 6043)

Technical Data Sheet


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

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.


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
S154A Solution Annealed - - - 248 max  
S154A Hardened and Tempered 880-1080 690 12 255-321 6"

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

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 (

Thanks to our global logistics network we can source from anywhere in the world in just a few days. We use a range of transport partners to enable us to ship overnight within the U.K. and Europe and provide fast shipping solutions to the rest of the world. If your requirement is urgent we can offer a priority shipping service, but also if time is not so critical we can offer more cost-effective options to ensure you get the best value for money. To find out more about our services click here.

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.

Sell your Stock Online at