AISI 4147 is a medium-carbon alloys steel with relatively high hardenability. It has good resistance to abrasion, fatigue and impact and is recommended for moderately severe service. It is an oil-hardening grade; however, it may be water hardened if suitable precautions are taken to minimize the danger of cracking during quenching. It has a relatively low tendency for the development of temper embrittlement during tempering in the range 850-1 100 H. Typical applications comprise gears, shafting, machine-tool parts, clutch parts and connecting rods. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, joining, and surface treatment. Filing Code: SA-419. Producer or source: Alloy steel mills and foundries.