C1117 and C11L17 Cold Roll Steel

C1117 is a low-carbon, high manganese steel with high mechanical properties and high machinability. 1117 is best suited for machined parts that must subsequently be case carburized. In addition to good surface hardness, the carburized part retains a ductile core. 1117 is ideal for use in the manufacture of parts subject to shock or vibrating stresses. 1117 is available as a leaded steel (11L17) in certain sizes. The addition of .15/.35 per cent lead improves free-machining characters without sacrificing carburizing properties.


1117/11L17 cold roll bars conforms to ASTM A29, A107, A108


The above values are average and may be considered as representative of 1117


1117 is used in automatic screw machines for manufacturing numerous parts requiring considerable machining and close tolerances, along with a smooth finish. It may be bent or formed where such cold working operations are not to severe. It is especially suited for carburized parts requiring a soft core and high surface hardness, such as gears, pinions, worms, king pins, ratchets, medium-duty shafts, studs, cam shafts, universal joints, etc


1117 has a machinability rating at 91% of B1112. Average cutting speed 150 ft/min. 11L17 will machine at approximately 170 surface feet per minute. 1117 is not readily welded due to high sulphur content. Because of the addition of lead in 11L17, its weldability is also poor.


1117 will respond to any carburizing method and subsequent heat treatments. Case hardening results in a hard case and relatively soft core. Carburize at 1650° -1700° F, oil or water quench and temper at 300° F. For a hard case and tough core, the following heat treatment is suggested: Carburize at 1650° -1700° F for approximately 8 hours, cool in oven and reheat to 1400° -1450° F. Quench in water and draw at 300°-350° F. Carburizing depth typically .060-.070".



Up to 1-1/2" incl. -.002
Over 1-1/2 to under 2-1/2 -.003
Over 2-1/2 to 4" incl. -.004


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