40Cr steel plate is one of the widely used products in the mechanical manufacturing industry. After quenching and tempering treatment, it has good comprehensive mechanical properties, good low-temperature impact toughness, and low notch sensitivity. The hardenability of steel is good, and it can be quenched to Ф 28-60mm, can be quenched to a depth of Ф 15～40mm。 This type of steel is suitable for cyanide and high-frequency quenching treatment in addition to quenching and tempering treatment. The cutting performance is good, with a relative machinability of 60% when the hardness is HB174-229. This steel is suitable for making medium-sized plastic molds.
42CrMo steel plate belongs to ultra-high strength steel plate, which has high strength and toughness, good hardenability, no obvious tempering brittleness, high fatigue limit and resistance to multiple impacts after quenching and tempering treatment, and good low-temperature impact toughness. This steel plate is suitable for manufacturing large and medium-sized plastic molds that require certain strength and toughness.
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