Stainless Steel T-416 (UNS S41600)
  • 12% Chromium Free-Machining Hardenable Stainless Steel.
  • Available mainly in wire and bar sections to ASTM A581 and A582.
Typical Analysis
C Mn P S Si Cr
.15 Max 1.25 Max .06 Max .15 Max 12/14 .60 Max
  • T-416 is quite simply described as a free-machining modification of T- 410. The addition of phosphorus and sulphur is responsible for improved machinability, but results in some disadvantages such as lower impact values and poor weldability. However, the steel is designed for free- machining and it is the best of all the stainless steels. The rating is as high as 90% - 160 surface feet per minute.
  • T-416 is mainly supplied in the annealed condition; but it responds to conventional heat treatment and a wide range of mechanical properties may be obtained. It is magnetic in all conditions.
  • T-416 is also available in Pump Shaft quality.
Typical Applications
  • T-416 is used in all applications demanding the mechanical properties and corrosion resistance of T-410 - plus the free-machining. Pump shafts, pistons, valves, automatic screw machined parts, nuts, bolts, studs.
Corrosion and Heat Resistance
  • Maximum resistance is obtained by hardened material, ground and polished. Excellent resistance to fresh water, mild alkalis and acids, dry atmospheres, neutral and basic salts. Fair resistance to scaling up to 675℃ in continuous service.
Heat Treatment
  • Annealing - Heat to 850℃/900℃ for 30 minutes per inch of section thickness. Cool slowly in furnace.
  • Hardening - Heat to 950℃/1000℃ and quench large sections in oil. Small sections may be quenched in air.
  • Tempering - According to mechanical properties required, but the range of 400℃/580℃ is not recommended.
Stainless Steel T-416 (UNS S41600) Mechanical Properties - T-416 Annealed Bar sizes - Typical
  • Note that ASTM A582 does not specify detailed mechanical properties for T-416 except that in the annealed condition the hardness shall not exceed HB 262.
Spec H.R. Ann Ann & CF
Tensile Strength, psi 75,000 85,000
Tensile Strength, N/mm² 517 586
Yield Strength, psi 40,000 50,000
Yield Strength, N/mm² 276 345
Elongation (%) 30 30
Reduction of Area (%) 60 60
Hardness 155 174
Stainless Steel T-416 (UNS S41600) Mechanical Properties - T-416 Wire Sizes
  • ASTM A581 specifies tensile strength as follows
Spec Cond. 'A' - Annealed Cond. 'A' - Annealed Cond. 'H' - Hard Temper
Tensile Strength, psi 85,000/125,000 115,000/145,000 140,000/175,000
Tensile Strength, N/mm² 590/860 790/1000 1000/1210

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