AISI 416 is a free-machining martensitic stainless steel designed for precision machining and components requiring useful strength and moderate corrosion resistance. It is commonly used for shafts, valve parts, and machined fittings.
AISI 416 is a martensitic stainless steel modified to provide improved machinability. It is suitable for manufacturing precision components that require efficient cutting operations, dimensional accuracy, and the ability to achieve increased hardness through appropriate heat treatment.
Typical applications include shafts, valve components, threaded parts, fasteners, pump components, and machined fittings. Its corrosion resistance is generally lower than that of common austenitic grades such as 304, particularly in aggressive environments. Selection should consider the supplied condition, required hardness, corrosion exposure, and operating loads. Typical Applications: Shafts, valves, pump components, fittings, fasteners, and precision-machined parts.Final chemical, mechanical properties, dimensions and tolerances are confirmed against the governing specification and purchase order.
| Element | Symbol | Min (%) | Max (%) | Nominal Target |
|---|---|---|---|---|
| Chromium | Cr | 12.00% | 14.00% | 13.00% |
| Carbon | C | — | 0.15% | Max 0.15% |
| Manganese | Mn | — | 1.25% | 1.00% |
| Sulfur | S | 0.15% | 0.35% | 0.25% |
| Silicon | Si | — | 1.00% | 0.50% |
| Phosphorus | P | — | 0.060% | Max 0.060% |
| Molybdenum | Mo | — | 0.60% | 0.30% (Optional) |
| Iron | Fe | Balance | Balance | ~84.7% |
| Condition / Thermal State | Tensile Strength (Rm) | Yield Strength (Re) | Elongation (A5) | Hardness (HBW / HRC) |
|---|---|---|---|---|
| Annealed (Sub-critical) | 510 – 590 MPa | 275 – 345 MPa | 20% – 30% | 155 – 207 HBW |
| Cold Drawn | 620 – 720 MPa | 520 – 620 MPa | 12% – 18% | 185 – 225 HBW |
| Hardened & Tempered (Cond T - 540°C) | 760 – 890 MPa | 580 – 690 MPa | 15% – 22% | 248 – 302 HBW (25 – 32 HRC) |
| Hardened & Tempered (Cond H - 300°C) | 1,100 – 1,300 MPa | 850 – 1,000 MPa | 10% – 15% | 350 – 410 HBW (38 – 44 HRC) |
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