Stainless Steel 416

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Description

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
Silicon  0 1.00
Manganese  0 1.50
*Nickel  0 1.00
Chromium  11.50 14.00
*Molybdenum  0 0.60
Phosphorous  0 0.06
Sulphur  0.15 0.35

 

 416 stainless steel equivalent

Grade UNS No Old British Euronorm Swedish SS Japanese JIS
BS En No Name
ss416 S41600 416S21 56AM 1.4005 X12CrS13 2380 SUS 416

416 stainless steel tempering chart

Tempering Temperature (°C) Tensile Strength (MPa) Yield Strength
0.2% Proof (MPa)
Elongation
(% in 50mm)
Hardness Brinell
(HB)
Impact Charpy V (J)
Annealed * 517 275 30 262
Condition T ** 758 586 18 248-302
204 1340 1050 11 388 20
316 1350 1060 12 388 22
427 1405 1110 11 401 #
538 1000 795 13 321 #
593 840 705 19 248 27
650 796 670 17.5 253 38


# 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.

Low Temperature Properties
416SS is not recommended for use at sub-zero temperatures due to a substantial drop in impact properties consistent with most steels other than the austenitic steel types.
Is stainless ferritic 416?
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.
What is the difference between 410 and 416 stainless steel?
Type 416 Stainless Steel is a stainless steel which is martensitic and can be hardened by heat treatment to higher strength and hardness levels. … Type 416 is somewhat inferior in corrosion resistance to other 12% chromium stainless steels, such as type 410.
How hard is 416 stainless?
416 Stainless Steel (SS) is a martensitic free machining grade of stainless that can be hardened by heat treatment to achieve elevated strength and hardness. Due to its low cost and ready machinability, 416 stainless steel is readily used in its highly tempered state.