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UK B.S. BS 970-1 (1996), 709M40 Specialsteel Specification for wrought steels for mechanical and allied engineering purposes. General inspection and testing procedures and specific requirements for carbon, carbon manganese, alloy and stainless steels and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Specialsteel: 709M40
Category Class Grade Standard Country Application
Steel GradesSpecialsteel 709M40 B.S. UK Specification for wrought steels for mechanical and allied engineering purposes. General inspection and testing procedures and specific requirements for carbon, carbon manganese, alloy and stainless steels

Chemical composition(mass fraction)(wt.%) of the 709M40

Si S P Mo Mn Cr C
0.1000 -0.4000 ≤0.0400 ≤0.0350 0.2500 -0.3500 0.7000 -1.0000 0.9000 -1.2000 0.3600 -0.4400

Mechanical Properties of steel grade 709M40

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)
721 (≥) 553 (≥) 22 14 41 Solution and Aging, Annealing, Ausaging, Q+T,etc 323

Physical Properties of steel grade 709M40

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
24 - -     0.14 -  
162 486 - 23.3 234   -  
673 - 33 33.2   243 241

Heat Treatment of steel grade 709M40

Heat treated : 1344°C - 1573°C

Technological Curves of steel grade 709M40

Cross Reference Table (Equivalent Grade) of 709M40

Relevant standard of 709M40

BS 970-1 (1996) Specification for wrought steels for mechanical and allied engineering purposes. General inspection and testing procedures and specific requirements for carbon, carbon manganese, alloy and stainless steels BS-970-1---(1996).pdf

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