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Alloy & Stainless Steels

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Xi'an Aircraft Industry Titanium Industry Co., Ltd.

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ADD:No.19, Zhuque street Xi’an Shaanxi

Hardenable Steel BS S155

Technical Data Sheet

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.  

Chemical Composition Limits
Weight%CSiMnP + S maxCrMoNi
S1550.39-0.441.50-1.800.60-0.90P 0.015
S 0.01
1.60-2.000.40-0.603.50-4.50

Typical Mechanical Properties

GradeConditionTensile Strength N/mm²Yield Strength N/mm²Elongation (%)Hardness (HB)Ruling Section
S155Norm & Softened---302-
S155Hardened & Tempered1900-210015508534-6013"
S155Hardened & Tempered1900-210015505
(Transverse test)
534-6013"

Availability

Alloy S155 for all stock availability contact Sales.

Specifications

AMS 6257

AMS 6417

AMS 6419

SAE 4340M / 300M

BMS 7.26

DMS 1935

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