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- ATI Allegheny Ludlum 440A Martensitic Stainless Steel
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  |
| Price | EMAIL US sales@lookpolymers.com |
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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