AK Steel 420HC Martensitic Stainless steel

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AK Steel 420HC Martensitic Stainless steel
Categories:	Metal; Ferrous Metal; Martensitic; Stainless Steel; T 400 Series Stainless Steel
Material Notes:	AK Steel 420 provides corrosion resistance similar to Type 410 martensitic stainless steel plus increased strength and hardness. It is magnetic in both the annealed and hardened conditions. Maximum corrosion resistance is attained only in the fully hardened of fully hardened and stress relieved condition. It is never used in the annealed condition. Typical uses include cutlery, surgical and dental instruments, scissors, tapes and straight edges. The alloy is not normally used at temperatures exceeding 800°F due to rapid softening and loss of corrosion resistance. Information provided by AK Steel
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Physical Properties	Metric	English	Comments

Density	7.74 g/cc	0.280 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Rockwell B	88	88	Annealed
Hardness, Rockwell C	55	55	Hardened and Stress Relieved
Tensile Strength, Ultimate	586 MPa	85000 psi	Annealed
	1586 MPa	230000 psi	Hardened and Stress Relieved
Tensile Strength, Yield	276 MPa @Strain 0.2 %	40000 psi @Strain 0.2 %	Annealed
	1344 MPa @Strain 0.2 %	194900 psi @Strain 0.2 %	Hardened and Stress Relieved
Elongation at Break	8.0 %	8.0 %	in 2 inches, Hardened and Stress Relieved
	25 %	25 %	in 2 inches, Annealed
Modulus of Elasticity	200 GPa	29000 ksi

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.0000550 ohm-cm	0.0000550 ohm-cm

Thermal Properties	Metric	English	Comments
CTE, linear	10.2 µm/m-°C @Temperature 0.000 - 100 °C	5.67 µin/in-°F @Temperature 32.0 - 212 °F
	12.1 µm/m-°C @Temperature <=649 °C	6.72 µin/in-°F @Temperature <=1200 °F
Specific Heat Capacity	0.460 J/g-°C @Temperature 0.000 - 100 °C	0.110 BTU/lb-°F @Temperature 32.0 - 212 °F
Thermal Conductivity	24.9 W/m-K	173 BTU-in/hr-ft²-°F

Component Elements Properties	Metric	English	Comments
Carbon, C	>= 0.15 %	>= 0.15 %
Chromium, Cr	12 - 14 %	12 - 14 %
Iron, Fe	83.78 - 87.85 %	83.78 - 87.85 %	As Remainder
Manganese, Mn	<= 1.0 %	<= 1.0 %
Phosphorus, P	<= 0.040 %	<= 0.040 %
Silicon, Si	<= 1.0 %	<= 1.0 %
Sulfur, S	<= 0.030 %	<= 0.030 %

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NAKS104b / 140580

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