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ATI Allegheny Ludlum 440A Martensitic Stainless Steel

Category Metal , Ferrous Metal , Martensitic , Stainless Steel , T 400 Series Stainless Steel
Manufacturer ATI Allegheny Ludlum
Trade Name
Port Shanghai port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF ATI Allegheny Ludlum 440A Martensitic Stainless Steel.pdf
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Material Notes:
Characteristics: superior wear resistance, hardenable, excellent corrosion resistance. Applications:cutlery, dental and surgical instruments, nozzles, valve parts, hardened steel ball and seats for oil well pumps, separating screens and strainers, springs, shears, and wear surfaces. Information provided by Allegheny Ludlum
Physical Properties Metric English Comments
Density 7.72 g/cc
0.279 lb/in³
Mechanical Properties Metric English Comments
Hardness, Rockwell B 95
95
Hardness, Rockwell C 31
31
Hardened+Tempered 1200°F
41
41
Hardened+Tempered 1000°F
50
50
Hardened+Tempered 550°F
52
52
Hardened+Tempered 900°F
53
53
Hardened+Tempered 600°F
53
53
Hardened+Tempered 800°F
54
54
Hardened+Tempered 400°F
Tensile Strength, Ultimate 717 MPa
104000 psi
Annealed
933 MPa
135000 psi
Hardened 1900°F, Tempered 1200°F
1224 MPa
177500 psi
Hardened 1900°F, Tempered 1000°F
1858 MPa
269500 psi
Hardened 1900°F, Tempered 900°F
1879 MPa
272500 psi
Hardened 1900°F, Tempered 550°F
1881 MPa
272800 psi
Hardened 1900°F, Tempered 800°F
1883 MPa
273100 psi
Hardened 1900°F, Tempered 600°F
2022 MPa
293300 psi
Hardened 1900°F, Tempered 400°F
Tensile Strength, Yield 727 MPa
105000 psi
Hardened 1900°F, Tempered 1200°F
1013 MPa
146900 psi
Hardened 1900°F, Tempered 1000°F
1466 MPa
212600 psi
Hardened 1900°F, Tempered 900°F
1518 MPa
220200 psi
Hardened 1900°F, Tempered 550°F
1531 MPa
222100 psi
Hardened 1900°F, Tempered 600°F
1579 MPa
229000 psi
Hardened 1900°F, Tempered 400°F
1610 MPa
234000 psi
Hardened 1900°F, Tempered 800°F
427 MPa

@Strain 0.200 %
61900 psi

@Strain 0.200 %
Annealed
Elongation at Break 20 %
20 %
Annealed
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
Specific Heat Capacity 0.460 J/g-°C
0.110 BTU/lb-°F
Thermal Conductivity 24.2 W/m-K

@Temperature 100 °C
168 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 77.9 - 83.4 %
77.9 - 83.4 %
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
Descriptive Properties Value Comments
Corrosion Rate mils per year 0.35 (5% Phosphoric Acid at 49°C)
Hardened martensitic grades were tested after tempering at 204°C
2.31 (5% Acetic Acid at 49°C)
Hardened martensitic grades were tested after tempering at 204°C
Pitting Potential, Volts vs. Sat. Calomel Electrode 0.598
100 ppm Chloride solution at 24°C, pH5. Samples had ground surface. Hardened martensitic grades were tested after tempering at 204°C.
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