Mechanical properties of 35CrMo4 steel, sectional shrinkage (%) : ≥45. 35CrMo4 steel sample size: sample blank size of 25 mm×50 mm; Specification for Heat treatment and metallographic structure of 35CrMo4 steel: annealing, preheating at 820~830℃ to air cooling at 200~300℃; Hardness of 35CrMo4 steel: annealing, 255±5℃; Tempering, 100~120℃ air cooling. Hardness of 35CrMo4 steel: Annealed, ≤182 HB;
Sample heat treatment system and metallographic structure: quenched into oil or water and heated to 500~600℃ for a certain time; Slow cooling and heating to 650~700℃ after a certain time of insulation out of the oven air cooling.
Specification for heat treatment and metallographic structure of 35CrMo4 steel. Heat treatment specification: quenching: 840℃, oil cold; 670℃, water cooled. Tempering: 100~200℃×2~4h, cooling with the furnace; 300℃×2~4h, furnace cold. Metallographic structure: no obvious pearlite and ferrite. Quenching medium is oil, water or salt bath.
Forging specification and forging die characteristics of 35CrMo4 steel; Forging temperature: 840~860℃. Mold temperature: about 650℃. Heating mode: forging heating, 800~920℃, furnace cold.
Forging speed and feed: 10~50 mm/min,2~5 mm/min,0~4 mm/min; With the forging size, shape, material thickness.
Die temperature: 900℃ (heat conduction coefficient); 1100℃ (coefficient of thermal expansion); 1200℃ (thermal strength and hardness). When the forging size is less than 6 mm, the die temperature should be less than 700℃.
Mold making: Mold opening according to the required size and shape.
Specification for heat treatment and delivery status of 35CrMo4 steel, quenched (860℃±20℃, 2h); Tempering (700~850℃, 3h); Condition of delivery: Hot rolled steel to be delivered in heat-treated or non-heat-treated condition. The hot rolled round rod is quenched to 830℃±20℃ by oil, and the oil cools slowly after cooling. Bar opening using water quenching to 780-800℃, air cooling.
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