What is 440 Stainless Steel?

Equivalent Material of 440 Stainless Steel Plate

440A Stainless Steel:

Equivalent to AISI 440A, ASTM A276, ASTM A314, ASTM A473, ASTM A580, ASTM A756, ASTM A580, AMS 5631, AMS 5632, AMS 5633, AMS 5634, AMS 5880, MIL-S-862, SAE J405 (51440A)

Similar grades: 7Cr17, 7Cr17MoV, X70CrMo15

440B Stainless Steel:

Equivalent to AISI 440B, ASTM A276, ASTM A314, ASTM A473, ASTM A580, ASTM A756, ASTM A580, AMS 5631, AMS 5632, AMS 5633, AMS 5634, AMS 5880, MIL-S-862, SAE J405 (51440B)

Similar grades: 9Cr18, 9Cr18Mo, X90CrMoV18

440C Stainless Steel:

Equivalent to AISI 440C, ASTM A276, ASTM A314, ASTM A473, ASTM A580, ASTM A756, ASTM A580, AMS 5630, AMS 5880, MIL-S-862, SAE J405 (51440C)

Similar grades: 9Cr18MoV, X105CrMo17

440 Stainless Steel Plate Chemical Composition(%)

Grade	C	Si	Mn	S	P	Cr	Ni	Mo
440A	0.60~0.75	≤1	≤1	≤0.030	≤0.040	16.00～18.00	–	≤0.75
440B	0.85～0.95	≤1	≤1	≤0.030	≤0.035	16.00～18.00	≤0.60	≤0.75
440C	0.95 – 1.20	≤1	≤1	≤0.030	≤0.040	16.00～18.00	–	≤0.75

Mechanical Properties

Property	440A	440B	440C
Hardness (Rockwell C)	56-59 HRC	57-60 HRC	58-62 HRC
Tensile Strength (MPa)	760-820	760-840	760-820
Tensile Strength (MPa)	450-600	450-600	450-600
Elongation at Break (%)	20-25	15-20	10-15
Modulus of Elasticity (GPa)	200	200	200

Physical Properties

Property	440A	440B	440C
Density (g/cm³)	7.65	7.75	7.75
Thermal Conductivity (W/m·K)	24	24	24
Specific Heat Capacity (J/kg·K)	460	460	460
Electrical Resistivity (μΩ·cm)	60	60	60
Coefficient of Thermal Expansion (μm/m·K)	10.4	10.4	10.4