AISI 4340 vs 4140 Steel Comparison - Otai special steel
Below is a chemical and mechanical properties comparison of AISI 4340 vs 4140 steel. 4340. 4340 Steel is a high quality Quenched and Tempered Alloy Structural steel, It belongs to the high quality medium carbon, Oil Quenched & Tempered Hardness is 28-34 HRC.4340 Annealing delivery hardness less than 250HB. 4140.
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