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A 803 Grade 25-4-4

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A 791 Grade 25-4-4 A 959 Type 25-4-4
#25-4-4

Description

USA SAE A 803/A 803M (2012), A 803 Grade 25-4-4 Specialsteel Welded Ferritic Stainless Steel Feedwater Heater Tubes and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Specialsteel: A 803 Grade 25-4-4
Category Class Grade Type Standard Country Application
Steel GradesSpecialsteel A 803 Grade 25-4-4 Precipitation-Hardening SAE USA Welded Ferritic Stainless Steel Feedwater Heater Tubes

Chemical composition(mass fraction)(wt.%) of the A 803 Grade 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 803 Grade 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)
948 (≥) 483 (≥) 22 33 43 Solution and Aging, Annealing, Ausaging, Q+T,etc 324

Physical Properties of steel grade A 803 Grade 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
13 - -     0.33 -  
438 238 - 12.3 141   -  
399 - 33 33.2   332 323

Heat Treatment of steel grade A 803 Grade 25-4-4

Heat treated : 1161°C - 1212°C

Technological Curves of steel grade A 803 Grade 25-4-4

Cross Reference Table (Equivalent Grade) of A 803 Grade 25-4-4

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

Relevant standard of A 803 Grade 25-4-4

A 803/A 803M (2012) Welded Ferritic Stainless Steel Feedwater Heater Tubes A-803-A-803M-(2012).pdf
A 791 Grade 25-4-4 A 959 Type 25-4-4
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Jiangyou Longhai Special Steel Co.,Ltd.

Our main peoducts of steel are many kinds of special steel, like tool steel, mould steel, alloy steel, alloy constructural steel, heat-resistant steel, high speed tool steel,spring steel and bearing steel , stainless steel and so on, which have formed 12 series and more than 350 varieties with n...

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