Stainless Steel

ISO certified stainless steel that shines on through without a care that rust never sleeps


Stainless steel stockholders and suppliers, delivering to the whole of the UK. Stainless steel grades are stocked in round bar, flat bar and plate (plasma cut). Specifications supplied include precipitation hardening, duplex, super duplex, austenitic and martensitic. Stainless steel grades are supplied in a large range conforming to British, European, American and International standards.

We welcome export enquiries for stainless steel. Contact our sales office and consult our shipping policy for further details.

If you do no find the specification you require on our web site please contact our experienced sales team who may be able to assist you with your enquiry.

Form of Supply

West Yorkshire Steel are stainless steel suppliers and stockholders of round bar, flat bar, sheet and plate. Diameters can be sawn to your required lengths as one offs or multiple cut pieces.

Plasma cut stainless steel plates can be cut to your required sizes, we can also guillotine stainless steel sheet.

Ground stainless steel bar can be supplied, providing a quality precision finished bar to your required tolerances.

Contact our experienced sales team who will assist you with your enquiry.

  • Sheet
  • Plate
  • Flat
  • Diameter
  • Hexagonal
  • Tube

Click on the headings below for further information

Precipitation Hardening Stainless

The main characteristics of precipitation hardening stainless specifications are the combination of the corrosion resistance of an austenitic stainless with the hardenability of a martensitic stainless.

ASTM Werkstoff DIN Firth Vickers
A564 Grade 630 1.4542 X5CrNiMoCuNb145PH FV520B
17/4PH Condition A 1.4594
H1150+H1150  

High contents of chromium, nickel, molybdenum and nitrogen give high alloyed austenitic stainless steel grades different characteristics to those of standard austenitic specifications. 904L has similar mechanical properties to the more common austenitic grades but has superior resistance to uniform corrosion. UNS S31254 provides exceptionally good resistance to uniform corrosion combined with higher strength and mechanical properties than the more common austenitic grades.

UNS AISI Werkstoff Outokumpu ASTM
S31254 904L 1.4547 254SMO A276
N08904   1.4539 6Mo (Moly) A479
    EN10272   B677
        F44

With the average chromium content of 18% and nickel content of 8% austenitic stainless steels are sometimes referred to as 18/8 (although the actual chromium and nickel content can vary from these figures). Austenitic stainless steels are non magnetic and cannot be hardened by heat treatment, though they can strain harden rapidly when cold worked.

BS970 AISI Werkstoff DIN UNS
316S11 310 1.4845 X5CrNi18-10 S31000
316S15 316L 1.4541 X5CrNi 18-10 S31008
310S24 316 1.4571 X8CrNiS18-9 S32100
321S31 316Ti 1.4301 X8CrNiS18-9 S30400
304S31 321 1.4305 X2CrNi 19-11 S30300
304S15 304 1.4306 X6CrNiTi 18-10 S30403
303S21 304L 1.4307 X12CrNi 25-21 S30100
304S11 303 1.4310 X6CrNiMoTi 17-12-2 S31600
EN58E 301 1.4539   S31603
EN58AM   1.4404   S31635
EN58M        
EN58E        
EN58B        

Heat treated martensitic stainless steel grades offer high strength and hardness. Martensitic grades can be heat treated due to having higher carbon content than other types of stainless steel. Martensitic grades are less ductile than other types of stainless steel. These grades are magnetic and are best suited for applications which require good corrosion resistance with good mechanical properties.

BS970 AISI Werkstoff DIN UNS
416S21 440B 1.4112 X12CrS13 S41000
410S21 440C 1.4125 X12Cr13 S42000
420S29 420 1.4057 X20Cr13 S43100
420S37 410 1.4005 X30Cr13 S44003
420S45 416 1.4006 X17CrNi16-2 S44004
431S29 431 1.4021 X90CrMoV18  
EN56AM   1.4208 X105CrMo17  
EN56A        
EN56C        
EN56D        
EN57        

Duplex and Super Duplex stainless steel grades offer resistance to stress corrosion and crevice corrosion. They are higher strength grades than standard austenitic stainless steel specifications.

UNS ASTM Werkstoff
S31083 A182 1.4462
S32760 F51 1.4501
  F55 EN10083

Heat treatment is only suitable for specific grades of stainless. When heat treating a stainless the hardening temperatures, including rate of heating, cooling and soaking times will vary due to factors such as the shape and size of each  component. Other considerations during the heat treatment process include the type of furnace, quenching medium and work piece transfer facilities. Please consult your heat treatment provider for full guidance on heat treatment of stainless steel grades.


Stainless steel is available with BS EN 10204 3.1 mill certificate, please request when placing any orders.


All our stainless steel grades are supplied in accordance with our ISO 9001 : 2008 registration.