Type 416

• Hardenable chromium type free-machining stainless steel
• Magnetic in all conditions
• Low frictional properties that reduce galling and seizing
• Has same basic properties as Type 410 - good corrosion and oxidation resistance plus high strength in the hardened and tempered condition

Available Forms

Types 416 Stainless Steels are available in:

• Bar
• Wire
• Billets

For most machined parts, Type 416 is usually supplied in the cold-finished condition.

Specifications

The following specifications are generally applicable:

Typical Applications

• Used for parts that are extensively machined and require the corrosion resistance of a 13% chromium stainless steel
• Applications include screw machine products, bolts, nuts, gears, shafts, valve parts, axles, fasteners, and fittings

Machinability

Type 416 has excellent machinability and provides good surface finishes.

Weldability

Welding Type 416 requires special handling. Weldability to this type can be improved by using methods that minimize dilution of the weld metal with the melted base metal. Reducing the time that welds are in the hot-shortness temperature range and use of Type 312 (29-9) filler metal help obtain satisfactory results.

Formability

Type 416 can be midly cold worked. Where severe cold working is required, 410 should be considered.

Corrosion Resistance

Types 416 Stainless Steel has useful levels of corrosion resistance to such media as natural food acids, waste products, basic and neutral salts, natural waters and most atmospheric conditions. It has adequate resistance for many applications where dampness and chemical activity normally cause rapid deterioration of mild and low alloy steel.

For best corrosion resistance, a smooth surface finish free from scale, contamination and foreign particles is recommended. It is desirable to passivate finished parts for 20 to 30 minutes in a solution of warm 20% nitric acid (by volume) plus 4 to 6% sodium dichromate (by weight).

Heat Treatment

ANNEALING: For maximum softness heat to 1550-1650° F hold for sufficient time, and furnace cool slowly to 1100° F.  For cold forming operations, uniformly heat to 1350-1450° F, hold for sufficient time and air cool.
HARDEN:  Heat to 1700-1850° F, hold for sufficient time, and air cool.
STRESS RELIEF: Heat to 300-800° F, hold for sufficient time and air cool.
TEMPER:  Heat to 1100-1400° F, hold for sufficient time and air cool.