Carbon and Low Alloy Steel Heat Treatment

Carbon steel, low alloy steel, and tool steel castings are used in several industries and are widely used materials for a range of applications and environments. It is economical, accessible in numerous grades, and can be heat-treated to improve its yield and tensile strength; and, adjust hardness or ductility to the engineer’s application needs or desired outcome.

Carbon and Low Alloy Steel Materail: 1018, 1020, 1025, 1030, 1040; 4130, 4140, 4330, 4340

Low Carbon Steel Heat Treatment:

Alloy	Heat Treatment	UTS (kpsi)	YS (kpsi)	% Elongation	Hardness
1020	Annealed	55-60	35-40	25-35	Rb 80 Max
1020 Modified	Annealed	85-100	60-65	10-15	Rb 100 Max

Low Alloy Steel Heat Treatment:

Alloy	Heat Treatment	UTS (kpsi)	YS (kpsi)	% Elongation	Hardness
8620	As Cast	65-75	45-55	20-25	Rb 100 Max
8620	Hardened	100-130	80-110	10-20	Rc 25-40
4130	As Cast	75-85	55-65	15-20	Rb 100 Max
4130	Hardened	130-170	100-130	5-20	Rc 23-44
4140	As Cast	85-95	65-75	15-20	Rb 100 Max
4140	Hardened	130-200	100-155	5-20	Rc 20-48
4340	As Cast	85-95	65-75	15-20	Rb 100 Max
4340	Hardened	130-200	100-180	5-20	Rc 20-48