3Cr2W8V heat treatment process
About 3Cr2W8V heat treatment process, today the company's product center has made a detailed introduction to 3Cr2W8V, but the information inside seems to be unable to meet everyone's requirements for 3Cr2W8V heat treatment process, so this article is added to 3Cr2W8V heat treatment process for a more detailed introduction.
For the 3Cr2W8V heat treatment process, which is both a hot work die steel and an alloy tool steel, we are divided into the following points to explain:
3Cr2W8V heat treatment process specification
Ingot: heating temperature 1150℃~1200℃, starting temperature 1100℃~1150℃, end temperature 850 ℃~ 900℃, air cooling to 700℃ after hot processing, pit cold or sand cold.
Billet: heating temperature 1130~1160℃, starting temperature 1080~1120℃, end temperature 850~900℃, first air cooling to 700℃ after hot processing, pit cold or sand cold.
General annealing specification for 3Cr2W8V heat treatment process
The annealing temperature is 800~820℃, the heat preservation is 2~4h, the furnace is cooled to 600℃, the hardness is 207~255HBW, and the organization is pearlite + carbide.
Specification for isothermal annealing of 3Cr2W8V heat treatment process
Annealing temperature 840~880℃, heat preservation 2~4h, isothermal temperature 720~740℃, heat preservation 2~4h, furnace cooling to 500℃ less air cooling, hardness ≤241HBW.
Specification for high temperature tempering of 3Cr2W8V heat treatment process
750~780℃ x 10~12h. The furnace is cooled to < 600℃, and the oven is air-cooled. Hardness ≤241HBW.
General softening specification for cold pressed blank for 3Cr2W8V heat treatment process
840~860℃×3~4n, cooled to < 600℃ at a cooling rate of 5℃/h, air cooling, hardness ≤ 241HBW before softening, hardness ≤207HBW after softening.
3Cr2W8V Heat treatment process hot-press die raw iron filings packing protection oscillating tempering specification
(670±10) ℃×2h, temperature rise to (720±10) ℃×6~8h; Then it was cooled to (670±10) ℃×2h, and warmed to (720±10) ℃×6~8h; Then slow cooling to (670±10) ℃×2h, temperature rise to (720±10) ℃×6~8h, slow cooling to ≤550℃, air cooling, hardness of 192HBW after treatment, can be successfully cold pressed forming.
Normalizing + high temperature tempering specification for 3Cr2W8V heat treatment process
Normalizing (880±10) ℃×5~6h, pit cold; High temperature tempering (740±10) ℃×2~3h, air cooling, hardness of 285HBW after treatment. This process can be used instead of annealing, which shortens the production cycle and facilitates continuous operation.
High temperature normalizing + high temperature annealing for 3Cr2W8V heat treatment process
High temperature normalizing 800℃×1h increased to 1180~1200℃×1.2h, air cooling; High temperature annealing 720℃×2h, furnace cooling. This process can eliminate the network carbide, which is a better pre-heat treatment method for strengthening and toughening treatment.
3Cr2W8V heat treatment process of forging waste heat fast maturing uniform spheroidization method
At the final forging temperature, it is quickly put into boiling water, cooled to 500~600℃ (5~10s), the water is air-cooled, and then subjected to 730℃ short-time spheroidization annealing.
3Cr2W8V heat treatment process of high temperature solution quenching rapid uniform spheroidization
The steel is heated to about 1200℃ austenitizing, and then quenched into boiling water (or quenched oil), cold to 400~500℃ when removed, and then 730~750℃ short time isothermal air cooling; After 1220℃×7min heating, oil cooling, (750±10) ℃×2h isothermal, and then furnace cooling to 550℃ air cooling.
3Cr2W8V heat treatment process of high temperature quenching + high temperature isothermal rapid uniform spheroidization method
1020~1100℃ after heating the average temperature, the oil is cold, and then reheating to 840~920℃ after the average temperature is not heat preservation and cooling with the furnace.
3Cr2W8V annealing + dehydrogenation annealing specification for heat treatment process
After averaging temperature at (790±10) ℃, it was kept warm for 2h, and then cooled to 550℃ at a cooling rate of ≤30℃/h, and then heated up for dehydrogenation annealing. The process specification can completely avoid the generation of martensite to ensure that the forgings obtain granular or spherical pearlite structure, thus avoiding the generation of cracks.
3Cr2W8V heat treatment process rework and reconditioning mold annealing specification
Annealing temperature 720~750℃, heat preservation 2~4h, air cooling.
General quenching and tempering specification for 3Cr2W8V heat treatment process
Quenching temperature 1050~1100℃, oil cold; Tempering temperature 660~680℃, hardness 49~52HRC, tempering temperature 600~620℃, hardness 40~44HRC.
3Cr2W8V heat treatment process of the second hardening hardening, tempering specification
Quenching temperature 1140~1150℃, oil cold; Tempering temperature 660~680℃, hardness 55HRC, tempering temperature 600~620℃, hardness 40~44HRC.
3Cr2W8V heat treatment process of high temperature hardening + high temperature tempering treatment specification
1150℃ heating quenching, 660~680℃×2~3h tempering.
3Cr2W8V heat treatment process of high temperature quenching + low temperature tempering treatment specification
1100~1150℃ heating quenching, 620~640℃×2h tempering. The process specification is used in molds that require higher thermal stability at higher temperatures, but are less subject to impact load and less subject to thermal shock.
Specification for low temperature quenching of 3Cr2W8V heat treatment process
580℃×1h preheating, rising to 800℃×1h, then rising to 1080~1100℃×50min, pre-cooling to 950℃ quenching hot oil (40℃), cooling to 300 '350℃ and air cooling to 150~200℃; And then quickly into the box-type furnace by 540℃×4h heat preservation and air cooling. Hardness 48~52HRC, metallography structure: tempered martensite + granular carbide + bainite.
3Cr2W8V heat treatment process high temperature annealing + Chinese tempering specification
1150~1250℃ high temperature quenching, lower than 500℃ tempering. The process specification can significantly improve the fracture toughness and strength.
3Cr2W8V heat treatment process of high temperature tempering + lower temperature heating isothermal quenching
1) High temperature conditioning: 1100~1150℃ heating, heat preservation 2~2.5h, oil cold; Temper at 680~720℃ and keep warm for 2.5h.
2) Isothermal quenching: 830~850℃ preheating for 1h, 900~950℃ holding for 2h, oil cooling to 200~240℃ into the furnace and tempering for 0.5h, air cooling; Temper at 650℃ for 2.5h, temper twice.
3Cr2W8V heat treatment process vacuum quenching, tempering specification
Preheating temperature 480~520℃ for the first time, vacuum degree 0.1Pa, quenching temperature 1050~1100℃, vacuum degree 1~10Pa, oil or N¬¬2 gas cooling, tempering temperature 560~580℃, hardness 42~47HBC. Tempering temperature 600~640℃, once 39~44.5HBC. ,
3Cr2W8V heat treatment process quenching, tempering, nitriding specification
Preheating temperature 550~600℃, heating temperature 1050℃, pre-cooling to 850℃ oil cooling, two tempering at 610℃, 580℃ (combined with nitriding or nitrocarburizing), hardness 40~45HBC (carburizing surface hardness 56~58HBC).
Specification for gas nitriding and gas nitriding carburizing for 3Cr2W8V heat treatment processes
Technical requirements: hardness > 1000HV, penetration depth 0.05~0.01mm.
Nitriding temperature 530~550℃, gas ratio: ammonia 50%, carrier gas (RX gas) 50% ammonia decomposition rate 30%~40%, holding time 5h.
3Cr2W8V heat treatment process cycle ultrafine treatment specification
3Cr2W8V heat treatment process pretreatment + quenching + tempering + intermediate tempering specification
1) Pretreatment: (850±5) ℃×4min/mm,(1060±5) ℃×12s/mm oil cooling, air cooling at 150℃,(730±10) ℃×2~3h oil cooling.
2) Quenching treatment: (500±5) ℃×1.5×~2.0min/mm, temperature rise to (850±5) ℃×15~20min/mm, continue to rise to (1100±5) ℃×12~15min/mm after heat preservation, pre-cooling to 830~850℃ oil cooling, 250℃ into the furnace, (405±5) ℃×1.5~2.0h heating, air cooling.
3) Tempering treatment: (500±5) ℃2~2.5h x 2 times.
4) Intermediate tempering: (200±5) ℃××8~10h, air cooling.
Specification for solid solution refinement of 3Cr2W8V heat treatment process
The forged blank is heated at 1200~1250℃, so that all carbics are basically dissolved into austenite, and then quenched hot oil or boiling water, and immediately at 720~850℃ (the upper limit of the temperature of the blank, the lower limit of the temperature of the molding mold) for high temperature tempering or short time isothermal spherodizing treatment, the final heat treatment can be conventional heat treatment specifications.
3Cr2W8V heat treatment process of ionic sulfur carbonitriding specification
Ion-sulfur-carbonitriding is carried out in a HDD-50 ion-nitriding furnace with ammonia, alcohol and carbon disulfide as the permeating agent. The ratio of alcohol and carbon disulfide is 2:1, the ratio of ammonia and mixed gas intake is 20:1~25:1, and negative pressure inhalation in the furnace. First, NH3500L/h, 520~540℃×2~3h, and then CS2+C2H5OH(2∶1) mixture 20L/h, NH3500L/h, co-permeate for 1h, the thickness of the permeating layer is 0.18~0.20mm, the compound layer is 15μm, the surface hardness is 500~600HV0.1. After grinding with No. 3 sandpaper, the hardness reaches 1000~1500HV0.1.
