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ATI Allegheny Ludlum Martensitic Stainless Steel Type 440A, Hardened + 316°C Temper

Category Metal , Ferrous Metal , Stainless Steel , T 400 Series Stainless Steel
Manufacturer ATI Allegheny Ludlum
Trade Name
Port Ningbo port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF ATI Allegheny Ludlum Martensitic Stainless Steel Type 440A, Hardened + 316°C Temper.pdf
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Material Notes:
Allegheny Ludlum Type 440A is a hardenable straight-chromium stainless steel which combines superior wear resistance of high carbon alloys with the excellent corrosion resistance of chromium stainless steels. Oil quenching this alloy from temperatures between 1800°F and 1950°F produces the high strength and/or wear resistance as well as corrosion resistance.A major use for this grade of heat treatable stainless steel is in cutlery. Type 440A is not readily amenable to fine blanking due to its higher strength and hardness in the annealed condition; and therefore, could require more powerful presses to blank parts. In addition, the presence of large primary carbides in Type 440A would tend to reduce die life.UTS, TYS, and hardness values below obtained after austenitizing at 1800-1950°F (982-1066°C) followed by an oil quench and two hour temper as above.Information provided by Allegheny Ludlum Corporation.
Physical Properties Metric English Comments
Density 7.74 g/cc
0.280 lb/in³
Mechanical Properties Metric English Comments
Hardness, Rockwell C 53
53
Tensile Strength, Ultimate 1883 MPa
273100 psi
Typical
Tensile Strength, Yield 1531 MPa

@Strain 0.200 %
222100 psi

@Strain 0.200 %
typical
Modulus of Elasticity 200 GPa
29000 ksi
Thermal Properties Metric English Comments
CTE, linear 15.0 µm/m-°C

@Temperature 20.0 - 200 °C
8.33 µin/in-°F

@Temperature 68.0 - 392 °F
16.8 µm/m-°C

@Temperature 20.0 - 600 °C
9.33 µin/in-°F

@Temperature 68.0 - 1110 °F
Thermal Conductivity 24.207 W/m-K

@Temperature 100 °C
168.00 BTU-in/hr-ft²-°F

@Temperature 212 °F
Melting Point 1399 - 1510 °C
2550 - 2750 °F
Solidus 1399 °C
2550 °F
Liquidus 1510 °C
2750 °F
Component Elements Properties Metric English Comments
Carbon, C 0.60 - 0.75 %
0.60 - 0.75 %
Chromium, Cr 16 - 18 %
16 - 18 %
Iron, Fe 81 %
81 %
as balance
Manganese, Mn <= 1.0 %
<= 1.0 %
Molybdenum, Mo <= 0.75 %
<= 0.75 %
Nickel, Ni <= 0.50 %
<= 0.50 %
Phosphorous, P <= 0.040 %
<= 0.040 %
Silicon, Si <= 1.0 %
<= 1.0 %
Sulfur, S <= 0.030 %
<= 0.030 %
Electrical Properties Metric English Comments
Electrical Resistivity 0.0000620 ohm-cm
0.0000620 ohm-cm
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