S275 is an unalloyed low carbon mild steel grade supplied as hot rolled. As a low carbon steel specifications S275 provides low strength with good machinability and is suitable for welding. 

S275 is a very popular low carbon steel grade suitable for numerous general engineering and structural applications. Supplied as a hot rolled non alloy steel it is used widely in the construction, maintenance and manufacturing industries.

S275 steel profiles are available as multiple or one off pieces. Flame cut steel blanks can be supplied surface ground and edge machined to your requirements. All flame cut steel pieces are dressed before final inspection and despatch. If you have any special requirements please inform our sales staff when you enquire for flame cut steel profiles.

Surface grinding and edge grinding of S275 is available on all flame cut steel components. This is carried out on Lumsden grinding rotary reciprocating table machines. After flame cutting pieces can be ground to clean up or blanks can be Lumsden ground to size on thickness to an tolerance of +/-0.25mm. A tighter tolerance may be possible, please provide your required tolerances to our sales team when enquiring.


S275 is not ideally suited to hardening, though it can be subjected to limited heat treatment process such as case hardening. When hardening S275 heat treatment 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 S275 carbon steel.

Chemical Composition

Steel Grades C Mn Si P S
S275 0.25% max
1.60% max
0.50% max
0.04% max
0.05% max

Mechanical Properties

Steel Grades
Tensile Strength
N/mm² (MPa)
Yield 
Strength
N/mm² (MPa)
S275
380-540 min 275