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Description

UK B.S. BS 1449-2, BS 1554, BS 2056, BS 5770-4, 420S45 Specialsteel Steel strip intended for the manufacture of springs. Specification for martensitic and austenitic stainless steel and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Specialsteel: 420S45
Category Class Grade Standard Country Application
Steel GradesSpecialsteel 420S45 B.S. UK Steel strip intended for the manufacture of springs. Specification for martensitic and austenitic stainless steel

Chemical composition(mass fraction)(wt.%) of the 420S45

C Si Mn P S Cr Mo Ni
0.28 -0.36 ≤1.00 ≤1.00 ≤0.04 ≤0.03 12.00 -14.00 ≤ ≥ ≤1.00

Mechanical Properties of steel grade 420S45

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)
641 (≥) 597 (≥) 24 33 22 Solution and Aging, Annealing, Ausaging, Q+T,etc 412

Physical Properties of steel grade 420S45

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
31 - -     0.43 -  
169 373 - 31.3 434   -  
625 - 21 43.2   322 241

Heat Treatment of steel grade 420S45

Heat treated : 1848°C - 1775°C

Technological Curves of steel grade 420S45

Cross Reference Table (Equivalent Grade) of 420S45

Grade Standard Country Application
420S45
420S45

Relevant standard of 420S45

BS 1449-2 Steel plate, sheet and strip. Specification for stainless and heat-resisting steel plate, sheet and strip BS-1449-2.pdf
BS 1554 Specification for stainless and heat-resisting steel round wire BS-1554.pdf
BS 2056 Specification for stainless steel wire for mechanical springs BS-2056.pdf
BS 5770-4 Steel strip intended for the manufacture of springs. Specification for martensitic and austenitic stainless steel BS-5770-4.pdf

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