416 Stainless Steel

416 stainless steel stockholders and suppliers, delivering to the whole of the UK.  Trafitec UK are suppliers of 416 stainless steel round bar.  416 is a martensitic free machining stainless grade providing excellent machinability with reasonable strength and corrosion resistance.  The higher sulphur content improves the machining and non-galling characteristics.  416 stainless steel is commonly supplied in the hardened and tempered but still machineable condition.

Related Specifications

1.4005, ASTM, AISI, BS970, 416S21, UNS, S41600, KE40A, SUS

Alternative stainless grades we supply

17/4PH, FV520B, S31254, 904L, 310, 316, 321, 440B, 440C, 420, 410, 431,  S31803, S32760

Form of Supply

Trafitec UK are suppliers and stockholders of round bar in grade 416 stainless.  Diameters can be sawn to your required lengths as one offs or multiple cut pieces.  Precision ground stainless steel bar can be supplied, providing a high quality ground bar to tight tolerances.

  • Diameter


Suitable for applications that require good strength, toughness and reasonable corrosion characteristics that are not too severe.  It is suitable for components such as valves, screws, bolts, pumps and rods.  416 is widely used for general engineering and popular in the food and automotive industries.


Grade C Mn P S Si Cr Ni Mo
416 Stainless Steel 0.09 – 0.15% 1.50% max 0.06% max 0.15 – 0.35% 1.00% max 11.50 – 13.50% 1.00% max 0.60% max


Corrosion Resistance 

With its higher sulphur content 416 stainless steel has lower corrosion resistance to that of 410 stainless and all other 400 series stainless steel grades.  It provides optimum corrosion resistance in the hardened and tempered condition.  Allowing oxygen to circulate freely on the surface 416 stainless steel will form an oxide film which protects the surface.  Keeping the surface free of scale and foreign particles improves corrosion resistance, finished components should be passivated.


Pre heat carefully, then raise temperature to 1150-1200ºC, hold until temperature is uniform through the steel.  Do not forge below 900ºC.  After forging 416 stainless cool slowly in furnace or warm ashes. 


Heat the 416 stainless steel slowly to 820-900ºC, hold until temperature is uniform through the steel.  Soak well and allow to cool in the furnace.


Heat the 416 slowly to 940-1020C and hold until the temperature is uniform throughout the steel.  After adequate soaking quench in oil or allow to air cool. Temper as soon as the tool is hand warm.

Typical Mechanical Properties

Condition Tensile N/mm² Yield N/mm² Elongation % Izod KCV J Hardness Brinell
P 550 – 700 340 15 34 152 – 207



Stainless steel 416 (416S21) grade is available with BS EN 10204 3.1 mill certificate, please request when placing any orders.