416 Stainless Steel



416/r Stainless Steel is a stainless steel which is martensitic and can be hardened by heat treatment to higher strength and hardness levels. It has much better machining properties than the austenitic grades, but lower corrosion resistance. In dry conditions and in environments that are mildly corrosive, 416/r machining grade is practically comparable with unmodified types. Type 416/r is somewhat inferior in corrosion resistance to other 12% chromium stainless steels, such as type 410. Type 416/r Stainless Steel may also be heat treated/annealed to varying degrees of strength and hardness by appropriate treatment. It may be used in welding, with some difficulty, and it must be annealed after welding at about 1450° F to improve its ductility and corrosion resistance.

    Chemical Composition:

  • Carbon 0.15%
  • Manganese 1.25%
  • Chromium 12.0-14.0%
  • Phosphorus .06%
  • Sulfur 0.15%
  • Silicon 1.0%

    Typical Applications:

  • Motor Shafts
  • Gears
  • Valve Parts
  • Appliance Components
  • Studs
  • Gun Barrel

Mechanical Properties

Tensile Strength (PSI) Yield Strength (PSI) Reduction of Area Elongation in 2″ Brinell Hardness
75,000 40,000 70 35 155

The above values are average and may be considered as representative of 416 stainless

 

Machineability & Weldability

Machinability is rated at 110% of B1112. Average cutting speed 180 ft/min.
416 has poor welding properties. Welds are brittle, with tendency to crack.
416 can be forged between 2100°-2300° F. Do not forge below 1700° F. Cool slowly.

Heat Treating

Hardening range is between 1750° F and 1850° F. Quench large sections in oil. Small sections can be quenched in air. Temper to required hardness.
Annealing: Full annealing range is between 1550° F and 1650° F. Cool slowly in furnace. Low annealing range is between 1200° F and 1400° F. Cool in air.

Tolerances

ROUND (drawn, smooth turned, or ground)

size (inches) OVER UNDER
.044 to 5/16, incl 0.001 0.001
5/16 to 1/2, excl 0.0015 0.0015
1/2 to 1, excl 0.002 0.002
1 to 1-1/2, excl 0.0025 0.0025
1-1/2 to 4, incl 0.003 0.003
4-1/8 to 4-1/2, incl 0.005 0.005
4-9/16 to 6, incl 0.008 0.008

 

ROUND (hot roll)

size (inches) OVER UNDER Out of RD
over 2 to 2-1/2, incl 0.031 0 0.023
over 2-1/2 to 3-1/2, incl 0.047 0 0.035
over 3-1/2 to 4-1/2, incl 0.063 0 0.046
over 4-1/2 to 5-1/2, incl 0.079 0 0.058
over 5-1/3 to 6-1/2. incl 0.125 0 0.07
over 6-1/2 to 8 incl 0.156 0 0.085