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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.

Chemical Requirements

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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