Carbon Plate - FREE
MACHINING STEELS
Proprietary specifications for Steel Plate with
Controlled Sultur
Additions
These grades comprise a group of steels that have been made
with increase sulfur levels to provide enhanced machinability
and increased tool life for applications with extensive machining
requirements. The additional sulfur results in higher level of
manganese sulfide inclusions, which provide a lubricating effect
and contribute to chip breakage. Surface finish and dimensional
stability may also be improved.
General requirements for delivery
Not covered by any standard specification, but it can be expected
that the material will conform to the requirements of ASTM
A 6.
Chemical Requirements
There are two families of free-machining plate steels available;
each offers different benefits. The C1119®/C1144® steels
have higher sulfur levels and will machine faster and provide
better tool life. Clean-Cut® steels have somewhat lower
sulfur levels, resulting in better internal soundness in thicker
plates, and also providing for improved surface finish.
In each family, there is one type of low carbon steel and one
type of medium carbon steel. The medium carbon varieties provide
higher strength and hardness and can be easily flame hardened.
C1119, C1144, and Clean-Cut are registered trademarks
of Mittal Steel USA.
Clean-Cut steels are also calcium treated.
Single values are maximums.
Tensile Requirements
There are no mechanical property requirements for these grades.
These products are not intended for structural purposes. Generally,
low carbon steels with 0.20% nominal carbon have a hardness
of about 120 – 170 Bhn; medium carbon steels have hardness
of around 170 – 230 Bhn.
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