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C1018 is a general purpose low carbon steel with good case hardening qualities. It has a higher manganese content than certain other low carbon grades, such as C1020. With higher manganese, C1018 is better steel for carburized parts since it produces a harder and more uniform case. It also has higher mechanical properties and better machinability due to the cold drawing process. Most C1018 is produced by cold drawing. In this process, oversized hot rolled bars, which have been cleaned of scale, are drawn through dies to the required size. Cold drawing increases tensile and yield strength but decreases ductility. Cold drawing also increases torsional strength, surface hardness, and wear resistance. Due to size limitations of the cold drawing process, large diameter bars are generally turned and polished, andthe hot roll rounds are usually machine turned, rather than drawn, then abrasively polished. C1018, available in rounds, flats, squares, and hexagons, has a relatively large size selection.
1018 cold roll bars conforms to ASTM A29, A108.
1018 cold roll bar conforms to ASTM A108.
General Information about C1018:
C1018 has a wide variety of applications. It is used for parts requiring cold forming, such as crimping, swaging, or bending. For severe bends, stress relieving may be necessary to prevent cracking. It is highly suitable for carburized parts, such as gears, ratchets, worms, pinions, pins, chain pins, dowels, machine parts, non-critical components of tool and die sets, tool holders, etc. It is used when good workability is required, on parts requiring threading, drilling, punching, and machining. It is extensively used for mounting plates, spacers, and fixtures. C1018 is suitable for all applications that do not require the greater strength of high carbon and alloy steels.
MACHINING AND WELDING:
C1018's machinability is rated at 78% of B1112. Average cutting speed 130 ft/min. This grade is easily welded by all welding processes including gas, air, and submerges arc, and the resultant welds and joints are of extremely high quality. Preheat and post-weld heating is generally not necessary.
HEAT TREATING - Forging, Normalizing, and Annealing:
C1018 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 eight hours; cool in oven and reheat to 1400° - 1450°F. Quench in water and draw at 300° - 350°F. Carburizing depth istypically .060-.070".