Stainless Steel 416 , UNS S41600, SUS416
SUS416 is a free machining basic straight chromium high hardenability martensitic stainless steel with excellent machinability, reasonable strength and corrosion resistance. Generally supplied either hardened and tempered in the tensile range 550 – 700 Mpa (condition P) Brinell range 152 – 207, or in the annealed condition with a maximum Brinell hardness of 207.
Characterised by excellent machinability, non-galling and non-seizing properties due to its higher sulphur content which has the effect of lowering its corrosion resistance. It is however resistant to mild corrosive atmospheres, fresh water, steam, organic materials, many mild acids and petroleum products, coupled with reasonable strength in the hardened and tempered condition.
SS416 due to its excellent hardenability is capable of being through hardened up to Rc40 depending upon carbon content and section size. Small sections can be air cooled and larger sections oil quenched for maximum through hardness.
Pre hardened and tempered stainless steel 416 will also respond readily to nitriding achieving a typical surface hardness of over Rc65. The nitriding process however reduces the corrosion resistance and is therefore not generally recommended except for critical applications where the benefit outweighs all other considerations.
Material magnetic in all conditions.
|416 stainless steel Chemical Composition||Min. %||Max. %|
|*Nickel & Molybdenum addition optional.||Carbon||0.09||0.15|
416 stainless steel equivalent
|Grade||UNS No||Old British||Euronorm||Swedish SS||Japanese JIS|
416 stainless steel tempering chart
|Tempering Temperature (°C)||Tensile Strength (MPa)||Yield Strength
0.2% Proof (MPa)
(% in 50mm)
|Impact Charpy V (J)|
|Condition T **||758||586||18||248-302||–|
# Tempering of this steel at temperatures of 400 to 580°C should be avoided due to low impact resistance.
Elevated Temperature Properties While sus416 displays a reasonable resistance to scaling in continuous service up to 650 oC, it does however experience a substantial drop in tensile strength, creep and stress rupture strength at relatively low working temperatures. It is also susceptible to hot cracking due to its high sulphur content.
NB. High temperature use is therefore not generally recommended.