42crmo4 is an industrial material. 42CrMo4 for manufacturing requirements than 35CrMo steel higher strength and quenched and tempered sections larger forging, such as locomotive traction with a large gear, supercharger transmission gear, rear axle, by the load of great connecting rod and spring clip, 42CrMo4 also Can be used for 2000m below the deep well drill pipe joints and salvage tools.
chemical component%
| C |
Mn |
Si |
P |
S |
Cr |
Mo |
| 0.38~0.45 |
0.60~0.90 |
≤0.40 |
0.035 |
≤0.035 |
0.90~1.20 |
0.15~0.30 |
Folding heat treatment specification and metallographic organization
Heat treatment specifications: quenching 850 ºC, oil cooling; tempering 560 ºC, water cooling, oil cooling.
Metallographic organization: Tempered sorbite.
Heat treatment:
Annealing annealing No. 1 "760 ± 10 ºC annealing, the furnace cooled to 400 ºC air cooling.
HB220-230
Normalizing No.4 860 ± 10 ºC normalizing, baked air cooled.
Quenching quenching + tempering No.5 840 ± 10 ºC quenching water or oil (depending on the product type of complexity), 680-700 degrees tempering. HB <217
Quenching quenching + tempering No.6 840 ± 10 ºC quenching oil, then 470 degree tempering treatment. HRC41-45
Quenching quenching + tempering No.7 840 ± 10 ºC quenching oil, and then 480 degrees tempering treatment. HRC35-45
Quenching quenching + tempering No.8 850 ºC quenching oil, then 510 degrees tempering treatment. HRC38-42
Quenching quenching + tempering No.9 850 ºC quenching oil, and then 500 degree tempering treatment. HRC40-43
Quenching quenching + tempering No.10 850 ºC quenching oil, then 510 ºC tempering treatment. HRC36-42
Quenching quenching + tempering No.11 850 ºC quenching oil, then 560 ºC tempering treatment. HRC32-36
Quenching quenching + tempering No.12 860 ºC quenching oil, then 390 degree tempering treatment. HRC48-52
Softening annealing specification
Annealing temperature 680 ~ 700 ° C, the furnace slow cooling, hardness ≤ 217HBW.
Quenching and tempering
Quenching temperature 830 ~ 860 ° C, oil cooling or 180 ~ 220 ° C salt bath cooling, hardness 52HRC, strength 1780MPa.
Tempering temperature 100 ° C / 200 ° C / 300 ° C / 400 ° C / 500 ° C / 600 ° C, hardness 50HRC / 49HRC / 46HRC / 42HRC / 36HRC / 28HRC
Delivery status: delivery by heat treatment (normalizing, annealing or high temperature tempering) or non-heat treatment, delivery status should be indicated in the contract.
Doris
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