AISI Type S21904 (Alloy 21-6-9) Stainless Steel, sheet and strip 30% cold reduction, tested at RT, stress relieved at 480°C (900°F) for 1 hour
Subcategory: Ferrous Metal; Heat Resisting; Metal; Stainless Steel; T S20000 Series Stainless Steel
Close Analogs: AISI Type S21900
Key Words: UNS S21904, AMS 5595, AMS 5656, ASME SA412, ASTM A269 (XM-11), ASTM A276 (XM-11), ASTM A314 (XM-11), ASTM A412 (XM-11), ASTM A473 (XM-11), ASTM A580 (XM-11)
Component | Wt. % | | | C | Max 0.04 | | Cr | 20 | | Fe | 64 | |
| Component | Wt. % | | | Mn | 9 | | N | 0.23 | | Ni | 6 | |
| Component | Wt. % | | | P | Max 0.06 | | S | Max 0.03 | | Si | Max 1 | |
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Material Notes: Austenitic, high strength, excellent corrosion resistance, and low magnetic permeability. Applications include aircraft applications such as ducting and bellows systems, tail pipes and exhaust systems, clamps, fasteners, flanges, and hydraulic tubing.
Physical Properties | Metric | English | Comments |
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Density | 7.83 g/cc | 0.283 lb/in³ | |
Mechanical Properties |
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Hardness, Brinell | 389 | 389 | Converted from Rockwell C hardness. |
Hardness, Knoop | 426 | 426 | Converted from Rockwell C hardness. |
Hardness, Rockwell C | 42 | 42 | |
Hardness, Vickers | 410 | 410 | Converted from Rockwell C hardness. |
Tensile Strength, Ultimate | 1278 MPa | 185000 psi | |
Tensile Strength, Yield | 1229 MPa | 178000 psi | at 0.2% offset |
Elongation at Break | 11 % | 11 % | in 50 mm |
Modulus of Elasticity | 200 GPa | 29000 ksi | Typical for stainless steel |
Machinability | 30 % | 30 % | Based on 100% machinability for AISI 1212 steel. |
Electrical Properties |
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Electrical Resistivity | 7.3e-005 ohm-cm | 7.3e-005 ohm-cm | |
Thermal Properties |
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CTE, linear 20°C | 16.7 µm/m-°C | 9.28 µin/in-°F | at 25-95°C, 17.3 µm/m°C at 25-205°C. Annealed |
CTE, linear 250°C | 18.2 µm/m-°C | 10.1 µin/in-°F | at 25-315°C. Annealed |
CTE, linear 500°C | 19.1 µm/m-°C | 10.6 µin/in-°F | at 25-540°C, 20.0 µm/m-°C at 25-760°C, 20.0 µm/m-°C at 25-870°C, 20.5 µm/m-°C at 25-980°C. Annealed |
Specific Heat Capacity | 0.48 J/g-°C | 0.115 BTU/lb-°F | Typical value for stainless steel. |
Thermal Conductivity | 13.8 W/m-K | 95.8 BTU-in/hr-ft²-°F | 13.8 at 95°C, 7.8 W/m°C at -180°C, 10.9 W/m°C at -73°C, 16.1 W/m°C at 205°C, 18.2 W/m°C at 315°C, 20.2 W/m°C at 425°C, 22.5 W/m°C at 540°C, 24.7 W/m°C at 650°C, 26.8 W/m°C at 760°C, 28.9 W/m°C at 870°C |
References for this datasheet.
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