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A 959 Type 25-4-4

Description

USA SAE A 959 (2011), A 959 Type 25-4-4 Specialsteel Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Specialsteel: A 959 Type 25-4-4
Category Class Grade Type Standard Country Application
Steel GradesSpecialsteel A 959 Type 25-4-4 Precipitation-Hardening SAE USA Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels

Chemical composition(mass fraction)(wt.%) of the A 959 Type 25-4-4

C Si Mn P S Ni Cr Al Cu Ti Fe N Mo
≤0.025 ≤0.75 ≤1.00 ≤0.04 ≤0.04 3.35 -4.50 24.50 -26.00 ≤ ≥ ≤0.50 ≤ ≥ ≤ ≥ ≤0.035 3.50 -4.50

Mechanical Properties of steel grade A 959 Type 25-4-4

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)
266 (≥) 448 (≥) 34 31 13 Solution and Aging, Annealing, Ausaging, Q+T,etc 344

Physical Properties of steel grade A 959 Type 25-4-4

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
22 - -     0.22 -  
519 959 - 21.3 241   -  
119 - 43 21.2   421 233

Heat Treatment of steel grade A 959 Type 25-4-4

Heat treated : 1598°C - 1717°C

Technological Curves of steel grade A 959 Type 25-4-4

Cross Reference Table (Equivalent Grade) of A 959 Type 25-4-4

Grade Standard Country Application
25-4-4
25-4-4
25-4-4

Relevant standard of A 959 Type 25-4-4

A 959 (2011) Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels A-959-(2011).pdf

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