Available Shapes
416 Stainless Steel
Alloy 416 / SS416 / 1.4005 is a martensitic, free-machining, chromium steel alloy that is generally considered to be the first free-machining stainless steel. It has the highest machinability of any stainless steel at about 85% of that of a free-machining carbon steel. Martensitic stainless steels were designed to be hardenable by heat treatment and also corrosion resistant. Although Alloy 416 and other martensitic stainless steels are not as resistant as austenitic or ferritic stainless, it still demonstrates good corrosion and oxidation resistance plus high strength in the hardened and tempered condition. Alloy 416HT is easily machined, is always magnetic, and has low frictional properties that reduce galling and seizing.
Related Specifications
1.4005 ASTM AISI BS970 416S21 UNS S41600 KE40A SUS
Applications
Analysis
Corrosion Resistance
Forging
Annealing
Hardening
Typical Mechanical Properties
Applications
Alloy 416 is generally used for parts that are extensively machined and require the corrosion resistance of a 13% chromium stainless steel. Applications that generally use Alloy 416 include: Electrical motors
Nuts and bolts
Pumps
Valves
Automatic screw machine parts
Washing machine components
Studs
Gears
Analysis
| Carbon | 0.09-0.15% | Chromium | 11.50-13.50% |
| Manganese | 1.50% max | Nickel | 1.00% max |
| Silicon | 1.00% max | Phosphorous | 0.06% max |
| Molybdenum | 0.60% max | Sulphur | 0.15-0.35% |
Corrosion Resistance
Demonstrates corrosion resistance to natural food acids, waste products, basic and neutral salts, natural waters, and most atmospheric conditions
Less resistant that the austenitic grades of stainless steel and also the 17% chromium ferritic alloys
High sulfur, free-machining grades like Alloy 416 are unsuitable for marine or other chloride exposure
Maximum corrosion resistance is achieved in the hardened condition, with a smooth surface finish
Forging
Pre heat carefully, then raise temperature to 1150-1200°C, hold until temperature is uniform through the steel. Do not forge below 900°C. After forging 416 stainless cool slowly in furnace or warm ashes.
Annealing
Heat the 416 stainless steel slowly to 820-900°C, hold until temperature is uniform through the steel. Soak well and allow to cool in the furnace.
Hardening
Heat the 416 slowly to 950-1020°C and hold until the temperature is uniform throughout the steel. After adequate soaking quench in oil or allow to air cool. Temper as soon as the tool is hand warm.
Typical Mechanical Properties
| Condition | Tensile N/mm² | Yield N/mm² | Elongation % | Izod KCV J | Hardness Brinell |
|---|---|---|---|---|---|
| P | 550-700 | 340 | 15 | 34 | 152-207 |
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