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Stainless Steel - Precipitation Hardening |
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Precipitation hardening stainless steels are designed to be formable in the solution annealed condition and can subsequently be hardened by heat treating to strength levels several times that of Type 304. Precipitation hardening stainless steels may be martensitic or semi-austenitic (sometimes called metastable austenitics) and contain chromium and nickel as the major alloying elements. Corrosion resistance is usually better than that of straight chromium ferritics.
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Stainless Steel - Precipitation Hardening | |
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| Alloy (UNS Designation) |
End Use | Composition nominal wt% |
Specifications | Density lb/in3 (g/cm3) |
Tensile Strength ksi. (MPa) |
0.2% Yield Strength ksi. (MPa) |
Elong- ation % |
Hardness | ||
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| AL 13-8™
S13800 |
Aerospace components, Injection molding equipment | C 0.05 max, Mn 0.2 max, P 0.01 max, S 0.008 max, Si 0.10 max, Cr 12.25-13.25, Ni 7.5-8.5, Al 0.90-1.35, Mo 2-2.5, N 0.01 max, Fe Balance | ASM 5864 ASTM A693 ASME SA693 | 0.279 (7.72) |
155 (1070) |
115 (790) |
18 | 43-47 Rockwell C (Hardened) | ||
| AL 15-5™
S15500 |
Valve parts, fasteners, fittings, air frame parts | C 0.07 max, Mn 1.0 max, P 0.04 max, S 0.03 max, Si 1.0 max, Cr 14.0-15.5, Ni 3.5 - 5.5, Cu 2.5-4.5, balance Fe | ASTM A-693 ASME SA-693 AMS 5862 | 0.281 (7.78) |
150 (1030) |
110 (760) |
10 | 38 Rockwell C max (Annealed) | ||
| AL 15-7™
S15700 |
Flat springs, bellows, diaphragms, fastners | C 0.09 max, Mn 1.0 max, P 0.04 max, S 0.03 max, Si 1.0 max, Cr 14.0-16.0, Ni 6.5 - 7.7, Al 0.75 - 1.5, Mo 2.0-3.0, balance Fe | ASTM A-693 ASME SA-693 AMS 5520 | 0.282 (7.81) |
150 max (1035 max Annealed) |
65 max (450 max Annealed) |
25 min (Annealed) | 100 Rockwell B max (Annealed) | ||
| AL 17-4™
S17400 |
Fasteners, air frame parts, valve parts, fittings | C 0.07 max, Mn 1.0 max, P 0.04 max, S 0.03 max, Si 1.0 max, Cr 15.0-17.5, Ni 3.0 - 5.0, Cu 3.0-5.0, balance Fe | ASTM A-693 ASME SA-693 AMS 5604 | 0.280 (7.75) |
150 (1030) |
110 (760) |
8 | 38 Rockwell C max (Annealed) | ||
| AL 17-7™
S17700 |
Flat springs, Bellows, Diaphragms, and Fasteners, Cockpit doors | C 0.09 max, Mn 1.0 max, P 0.04 max, S 0.03 max, Si 1.0 max, Cr 16.0-18.0, Ni 6.5 - 7.7, Al 0.75-1.5, balance Fe | ASTM A-693 ASME SA-693 AMS 5528 AMS 5529 (cold rolled temper) | 0.282 (7.81) |
150 max (1035 max Annealed) |
55 max (380 max Annealed) |
20 min (Annealed) | 92 Rockwell B max (Annealed) | ||
| AM 350™
S35000 |
Valves, Aircraft tubing, Bellows, Mounts, Brackets, and Ducts | C 0.07-0.11, Mn 0.5-1.25, P 0.04 max, S 0.03 max, Si 0.5 max, Cr 16.0-17.0, Ni 4.0-5.0, Mo 2.5-3.2, N 0.07-0.13 balance Fe | ASTM A-693 ASME SA-693 AMS 5548 | 0.282 (7.81) |
200 max (1380 max Annealed) |
85 max (585 max Annealed) |
12 min (Annealed) | 30 Rockwell C max (Annealed) | ||
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