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ATI Allegheny Ludlum 420 Martensitic Stainless Steel

Category Metal , Ferrous Metal , Martensitic , 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 420 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
Specific Gravity 7.73 g/cc
7.73 g/cc
Density 7.68 g/cc
0.277 lb/in³
Mechanical Properties Metric English Comments
Hardness, Rockwell B 85
85
87
87
Hardness, Rockwell C 23
23
Hardened+Tempered 1200°F
36
36
Hardened+Tempered 1000°F
44
44
Hardened+Tempered 550°F
45
45
Hardened+Tempered 600°F
46
46
Hardened+Tempered 800°F
46
46
Hardened+Tempered 900°F
48
48
Hardened+Tempered 400°F
Tensile Strength, Ultimate 586 MPa
85000 psi
Annealed
838 MPa
122000 psi
Hardened 1900°F, Tempered 1200°F
1093 MPa
158500 psi
Hardened 1900°F, Tempered 1000°F
1583 MPa
229600 psi
Hardened 1900°F, Tempered 550°F
1606 MPa
232900 psi
Hardened 1900°F, Tempered 600°F
1606 MPa
232900 psi
Hardened 1900°F, Tempered 900°F
1627 MPa
236000 psi
Hardened 1900°F, Tempered 800°F
1759 MPa
255100 psi
Hardened 1900°F, Tempered 400°F
Tensile Strength, Yield 652 MPa
94600 psi
Hardened 1900°F, Tempered 1200°F
951 MPa
138000 psi
Hardened 1900°F, Tempered 1000°F
1213 MPa
175900 psi
Hardened 1900°F, Tempered 550°F
1234 MPa
179000 psi
Hardened 1900°F, Tempered 600°F
1236 MPa
179300 psi
Hardened 1900°F, Tempered 900°F
1280 MPa
186000 psi
Hardened 1900°F, Tempered 800°F
1311 MPa
190100 psi
Hardened 1900°F, Tempered 400°F
310 MPa

@Strain 0.200 %
45000 psi

@Strain 0.200 %
Annealed
Elongation at Break 29 %
29 %
Annealed
Thermal Properties Metric English Comments
CTE, linear 11.2 µm/m-°C

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

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

@Temperature 20.0 - 600 °C
6.94 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 1454 - 1510 °C
2649 - 2750 °F
Solidus 1454 °C
2649 °F
Liquidus 1510 °C
2750 °F
Component Elements Properties Metric English Comments
Carbon, C 0.15 - 0.40 %
0.15 - 0.40 %
Chromium, Cr 12 - 14 %
12 - 14 %
Iron, Fe 83 - 87.9 %
83 - 87.9 %
as balance
Manganese, Mn <= 1.0 %
<= 1.0 %
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 0.0000560 ohm-cm
0.0000560 ohm-cm
Descriptive Properties Value Comments
Corrosion Rate mils per year 0.068 (5% Phosphoric Acid at 49°C)
Hardened martensitic grades were tested after tempering at 204°C
1.11 (5% Acetic Acid at 49°C)
Hardened martensitic grades were tested after tempering at 204°C
Pitting Potential, Volts vs. Sat. Calomel Electrode 0.581
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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