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Normalizing is generally recommended as a preparatory heat treatment. For 4130 steel, it is common and important to perform a normalizing process prior to final quenching and tempering. The primary purpose of this step is to refine the grain structure and homogenize the microstructure. This pretreatment is particularly critical for ensuring high-quality, high-performance parts, [...]
Although 4140 steel and 4130 steel both belong to the 41xx series chromium-molybdenum alloy steels under the AISI/SAE system, they still have differences. Core Composition: 4130(Carbon:0.28-0.33%) < 4140(Carbon:0.38-0.43%） Mechanical Properties: 4140+QT has higher strength(850~1080MPa) and hardness (28~32HRC), but slightly lower toughness; while 4130+QT has lower strength (650~800MPa), but better impact toughness and plasticity. Processing [...]