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UK B.S. BS 5S 99 : 1994, S99 Specialsteel 2.5 % nickel-chromiummolybdenum (high carbon) steel billets, bars, forgings and parts (1230-1420 MPa: limiting ruling section 150 mm) and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Specialsteel: S99
Category Class Grade Type Standard Country Application
Steel GradesSpecialsteel S99 Martensite B.S. UK 2.5 % nickel-chromiummolybdenum (high carbon) steel billets, bars, forgings and parts (1230-1420 MPa: limiting ruling section 150 mm)

Chemical composition(mass fraction)(wt.%) of the S99

C Si Mn P S Cr Mo Ni Al Fe
0.36 -0.44 0.10 -0.35 0.45 -0.70 ≤0.025 ≤0.015 0.5 -0.8 0.45 -0.65 2.3 -2.8 0.015 -0.050 ≤Base

Mechanical Properties of steel grade S99

Yield
Rp0.2 (MPa)
Tensile
Rm (MPa)
Impact
KV/Ku (J)
Elongation
A (%)
Reduction in cross section on fracture
Z (%)
As-Heat-Treated Condition Brinell hardness (HBW)
423 (≥) 654 (≥) 34 23 41 Solution and Aging, Annealing, Ausaging, Q+T,etc 444

Physical Properties of steel grade S99

Temperature
(°C)
Modulus of elasticity
(GPa)
Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and Thermal conductivity
(W/m·°C)
Specific thermal capacity
(J/kg·°C)
Specific electrical resistivity
(Ω mm²/m)
Density
(kg/dm³)
Poisson’s coefficient, ν
44 - -     0.12 -  
562 228 - 23.3 111   -  
493 - 33 13.2   341 423

Heat Treatment of steel grade S99

Heat treated : 1775°C - 1439°C

Technological Curves of steel grade S99

Cross Reference Table (Equivalent Grade) of S99

Relevant standard of S99

BS 5S 99 : 1994 2.5 % nickel-chromiummolybdenum (high carbon) steel billets, bars, forgings and parts (1230-1420 MPa: limiting ruling section 150 mm) BS-5S-99-:-1994.pdf

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