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Hardenable Steel BS S155


Technical Data Sheet

 

Chemical Composition Limits
Weight% C Si Mn P + S max Cr Mo Ni
S155 0.39-0.44 1.50-1.80 0.60-0.90 P 0.015
S 0.01
1.60-2.00 0.40-0.60 3.50-4.50

BS S155 is the British aerospace equivalent of U.S. steel grade 300M (4340M / AMS 6257). It is a vacuum melted grade supplied in the normalised and tempered/softened condition to allow for final heat treatment. It has a combination of ultra high strength, good fatigue resistance and excellent transverse properties and as such finds many applications in the aerospace industry such as undercarriage components, gears and shafts.

Typical Mechanical Properties

Grade Condition Tensile Strength N/mm² Yield Strength N/mm² Elongation (%) Hardness (HB) Ruling Section
S155 Norm & Softened - - - 302 -
S155 Hardened & Tempered 1900-2100 1550 8 534-601 3"
S155 Hardened & Tempered 1900-2100 1550 5
(Transverse test)
534-601 3"

Availability
Alloy S155 for all stock availability contact Sales.

Specifications

AMS 6257
AMS 6417
AMS 6419
SAE 4340M / 300M
BMS 7.26
DMS 1935

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).

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.

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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