ATI Allegheny Ludlum Martensitic Stainless Steel Type 425 Mod, Hardened + 427°C Temper

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ATI Allegheny Ludlum Martensitic Stainless Steel Type 425 Mod, Hardened + 427°C Temper
Categories:	Metal; Ferrous Metal; Stainless Steel; T 400 Series Stainless Steel
Material Notes:	Allegheny Ludlum Type 425 Mod 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. When blanking cutlery parts from annealed raw material stock, Type 425 Mod will usually exhibit hardness, yield strength, and tensile strength that are low enough for fine blanking purposes. 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. Information provided by Allegheny Ludlum Corporation.
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Physical Properties	Metric	English	Comments

Density	7.72 g/cc	0.279 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Rockwell C	53	53
Tensile Strength, Ultimate	1759 MPa	255100 psi	Typical
Tensile Strength, Yield	1452 MPa @Strain 0.2 %	210600 psi @Strain 0.2 %	typical
Modulus of Elasticity	200 GPa	29000 ksi

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.0000610 ohm-cm	0.0000610 ohm-cm

Thermal Properties	Metric	English	Comments
CTE, linear	11.6 µm/m-°C @Temperature 20.0 - 200 °C	6.44 µin/in-°F @Temperature 68.0 - 392 °F
	12.8 µm/m-°C @Temperature 20.0 - 600 °C	7.11 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	1472 - 1510 °C	2682 - 2750 °F
Solidus	1472 °C	2682 °F
Liquidus	1510 °C	2750 °F

Component Elements Properties	Metric	English	Comments
Carbon, C	0.50 - 0.55 %	0.50 - 0.55 %
Chromium, Cr	13 - 14 %	13 - 14 %
Iron, Fe	85 %	85 %	as balance
Manganese, Mn	<= 1.0 %	<= 1.0 %
Molybdenum, Mo	0.80 - 1.2 %	0.80 - 1.2 %
Nickel, Ni	<= 0.50 %	<= 0.50 %
Phosphorus, P	<= 0.040 %	<= 0.040 %
Silicon, Si	<= 1.0 %	<= 1.0 %
Sulfur, S	<= 0.030 %	<= 0.030 %

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NL4254 / 17930

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