Fatigue-Proof and Stressproof steel bars are melted as a modification of AISI 1144 steel. Fatigue-Proof is made by various combinations of mechanical working and thermal treatments including LaSalle’s e.t.d. (elevated-temperature drawing) process. Similarly, Stressproof is made by a process that consists of drawing the bar though a special die under heavy draft, then stress relieving it in a precisely controlled furnace. This datasheet provides information on composition, hardness, and tensile properties as well as fatigue. It also includes information on forming and machining. Filing Code: CS-31. Producer or source: Niagara LaSalle. Originally published November 1969, revised June 1989, revised June 2006.

AISI 1144 is a resulfurized carbon steel containing nominally 1.50% manganese and 0.24-0.33% sulfur to provide a free-machining steel. It is recommended especially for high-production automatic machine products. It has relatively low hardenability. Its ductility and toughness are reasonably good in the longitudinal direction, but they tend to be low in the transverse direction. The many uses of AISI 1144 include mine-car axles and shafts, screws, propeller shafts, ball joints, bushings, bolts and gears. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: CS-98. Producer or source: Carbon steel mills.

Bethlehem Lukens Plate (BLP) C1119/C1144 Modified steels are resulfurized carbon steels containing nominally 1.15% Mn and 0.20 to 0.33% S to provide a free-machining steel. They are recommended especially for high-production automatic machining. They have relatively low hardenability. Their ductility and toughness are reasonably good in the longitudinal direction, but they tend to be low in the transverse direction. The many uses include mining equipment, bushings, bolts, and gears. This datasheet provides information on composition, physical properties, microstructure, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, machining, and joining. Filing Code: SA-436. Producer or source: International Steel Group Inc. Originally published February 1989, revised February 2004.