Free Cutting Steel also called Free Machining Steels are steels which are easy to machine. The machinability of the material is increased as the chips are broken in small pieces when machined thus avoiding their entanglement in the machinery. This enables automatic run of the equipment without human interaction. Free cutting steels with lead also allow for higher machining rates. As a thumb rule, free cutting steel normally costs 20% to 30% more than the standard steel. However this is made up by increased machining speeds, larger cuts, and longer tool life.
In turning, milling and drilling operations commonly known as machining operations, deformation/welding of the tool/work piece interface occurs rather than chip formation. During the machining operations surface finish is impaired, cutting temperature increased and tool life reduced significantly. A large ‘built-up edge’ is formed on the tool tip at very low sulfur contents. This requires frequent dressing or changing of tools, reduced productivity and higher costs.
12L14 is a free machining carbon steel bar containing maximum 0.15% Carbon. Due to the addition of Lead (Pb) this grade has the highest machinability and is suitable for high-volume ultra-high speed machining.
1) AS1443 grade 12L14, ASTM A108 grade 12L14.
2) ASTM A108 grade 1213 or grade 1215,
3) Euronorm EN 10087 grade 11SMnPb37 (1.0737).
CONDITIONS OF SUPPLY
Bright round bar up to 63.5mm diameter is all cold drawn.
Bright round bars of 63.5- 100mm diameter are cold drawn or smooth-turned and polished.
Bright round bars over 100mm diameter are all smooth-turned and polished.
All hexagon bar and all square bar is cold drawn.
Flat Bar is cold drawn and supplied sharp-edged.
- Drawn : H10
- Smooth-turned and polished : H10,H11
- Square Bar: H11
- Hex Bar: H11
- Flat Bar: H11
- Domestic bin axles
- Concrete anchors
- Padlock shackles (case hardened)
- Hydraulic fittings
- Vice jaws (case hardened).