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Free cutting · BS 970
Built for the lathe — sulphur makes the chips break and the tools last.
230M07Free-cutting mild steelØ 4 – 19 mm
Why this grade
Around 0.25–0.35 % sulphur forms manganese sulphide stringers that act as chip breakers. On automatic lathes this means faster feeds, better finish and longer tool life. It is not meant for heading or welding.
Turned components on autos and CNC
Hydraulic and pneumatic fittings
Screws, nuts and inserts
Precision spacers
Behaviour
Cold heading1/5
Machinability5/5
Hardenability1/5
Strength potential2/5
Relative comparison across the grades we supply.
Chemistry
C0.07 – 0.15
Mn0.80 – 1.20
Si≤ 0.10
S0.25 – 0.35
P≤ 0.07
Typical ranges per BS 970. Actual values per mill test certificate.
Properties
MicrostructureFerrite + MnS inclusions
Typical tensile (cold drawn)≈ 360 – 500 MPa
MachinabilityExcellent
How we anneal it
Stress relief
Keeps drawn bars straight and dimensionally stable through machining.
Annealing explainedEnquiries
We come back with availability and a quotation — usually the same working day.