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France AFNOR NF P685B Pressure vessels. Seamless steel gas vessels. Types of steels. Semi finished products and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: P685B / P 685 B
Category Grade Standard Region/Area Standard Content
Metals P 685 B NF A49-900 France Pressure vessels. Seamless steel gas vessels. Types of steels. Semi finished products

Chemical composition(mass fraction)(wt.%) of the P 685 B

Element Min Max Similar

Mechanical Properties of steel grade P 685 B

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)
836 (≥) 552 (≥) 21 41 43 Solution and Aging, Annealing, Ausaging, Q+T,etc 131

Physical Properties of steel grade P 685 B

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
43 - -     0.11 -  
589 266 - 32.3 411   -  
633 - 43 22.2   331 342

Heat Treatment of steel grade P 685 B

Heat treated : 1894°C - 1736°C

Technological Curves of steel grade P 685 B

Cross Reference Table (Equivalent Grade) of P 685 B

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