Carbon Steel 1117

1117 (HR,CF) - Low carbon, high manganese steel. Good for bending, broaching and most deforming without cracking.C1117 with high mechanical properties and high machinability. Case hardening is deep and uniform. 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 is used in automatic screw machines for manufacturing numerous parts requiring considerable machining and close tolerances, along with a smooth finish. 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. It posses much of the machining quality of 1212 Screw Stock but with improved mechanical properties. Bars are produced from special quality hot rolled bars.1117 is used in automatic screw machines for manufacturing numerous parts that require considerable machining and close tolerances, along with a smooth finish. It may be bent or formed where such cold working operations are not too severe.

1117 is not readily wielded due to high sulphur content. Gas or arc welding may be used providing joints are preheated. To develop equivalent strength in a weld, a low alloy filler is recommended. Stress relieving after welding is also recommended. 1117 will respond to any of the standard carburizing methods and subsequent heat treatment. For a hard case and tough core, the following heat treatment is suggested: Carburize at 1650-1700 0°F for approximately 8 hours. Cool in box and reheat to 1400-1450°F. Quench in water and draw at 300-350°F.

Machineability and Weldability

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.

Heat Treating

1117 will respond to any carburizing method and subsequent heat treatment. Case hardening results in a hard case and relatively soft core. Carburize at 1650° -1700° F, oil or water quenching and tempering 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".

Mechanical Properties

Condition	Tensile Strength (PSI)	Yield Strength (PSI)	Reduction of Area	Elongation in 2"	Brinell Hardness
1" Rd, cold drawn	80,000	70,000	50	16	156

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