BS S155

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Alias

S155
BS S155
BMS 7 26
300M
AMS 6257
4340M
MIL S 8844

Chemistry

Element	Min	Max
C (Carbon)	0.39%	0.44%
Cr (Chromium)	1.6%	2%
Mn (Manganese)	0.6%	0.9%
Mo (Molybdenum)	0.4%	0.6%
Ni (Nickel)	3.5%	4.5%
P (Phosphorus)		0.015%
S (Sulphur)		0.01%
Si (Silicon)	1.5%	1.8%
V (Vanadium)	0.05%	0.1%

Mechanical Properties	Min	Max
Ultimate Tensile Strength (UTS)	1900 MPa	2100 MPa
0.2% Proof Stress	1550 MPa
Elongation	8%
Hardness (Brinell)		302 HB
Reduction of Area	30%

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