D2 die steel with high wear resistance and micro deformation Cold die steel The wind, hard tool steel, high carbon high chromium content up to 1.5%, at 11.5%, after heat treatment, the hardness is up to 60HRC. D2 steel can be used for the manufacture of large section and complicated shape, subjected to large impact force, requirements of high abrasion resistance of cold working die steel, such as silicon die, cold cutting scissors, trimming die
The percentage (%)
Zero point eight zero
Advantages: 1, good processability, heat treatment, dimensional stability
2, excellent mechanical processing
3, hardened, excellent dimensional stability
4, hardening and tempering, by with good surface hardness and high toughness of the body
High abrasion resistance, vacuum heat treatment to HRC60 degrees -62, processing performance.
Heat treatment process for D2 die steel
The workpiece after the rough machining, heating to 600~650 DEG C, 2h insulation, furnace cooling to 500 DEG C, followed by air cooling
The mechanical properties of D2 die steel
Hardness: annealing, less than 255HB, the indentation diameter is larger than 3.8mm; quenching, more than 59HRC
D2 die steel quenching precautions
After quenching tempering should be timely, prevent cracking, and to prevent the surface decarburization, gauges and high-precision molds should be deep cryogenic treatment (-70 C), and the high temperature tempering, reduce the deformation of the workpiece, high temperature tempering temperature 500~560, hardness greater than 58HRC
D2 die steel heat treatment and metallographic structure
Specification of heat treatment: quenching, 820 + 15 1000 + 6 C C preheating (salt) or 1010 + 6 C (controlled atmosphere furnace) heating, heat preservation of 10 ~ 20min, air-cooled, 200 + 6 C tempering.
Stress relieving annealing: the workpiece after the rough machining, heating to 600~650 DEG C, heat for 2 hours, with the furnace cooling to 500 DEG C, followed by air cooling.
Workpiece quenching: slow heating to 600 degrees, 20 minutes for the first time insulation after preheating, temperature to 850 DEG C, 30min second preheating and heat preservation, finally heating to 1020~1040 Deg. C, thermal insulation 25~40min, followed by air cooling.
Quenching tempering: immediately after tempering and tempering holding time at least two times, each time not less than 2H
Note: after quenching tempering should be timely, prevent cracking, and to prevent the surface decarburization, gauges and high-precision molds should be deep cryogenic treatment (-70 C), and the high temperature tempering, reduce the deformation of the workpiece, high temperature tempering temperature 500~560, hardness greater than 58HRC.
Hardness: annealing, less than 255HB, the indentation diameter is larger than 3.8mm, quenching, more than 59HRC.
Andmicrostructure heat treatment: quenching, 820 + 15 1000 + 6 C C preheating (salt) or 1010 + 6 C (controlled atmosphere furnace) heating, heat preservation of 10 ~ 20min, air-cooled, 200 + 6 C tempering.
Steelmaking process: refining ingot annealing mother 2 days - three days - - electric heating slag insulation 2 days - into the forging furnace (pre 2 days) - Forged 1 days - 2 days - thermal annealing and heat preservation for 2 days - 1 days of car processing
The metallographic analysis of carbide:
Electro slag: 3-3.5
D2 die steel factory,
Fire to HB255
The use of D2 die steel
Used for metal stamping die, drawing die, stainless steel plate punching die, blanking die with high hardness, shear cutter, thread rolling die, metal parts manufacturing, machinery manufacturing, etc..
For example, the typical application of D2 die steel
1) for refrigerator compressor cover drawing die, the quenching hardness of 56~58HRC.
(2) to improve the D2 cold rolled flat die service life, using the method of adding rare earth, while the wear resistance and impact toughness of the steel are greatly improved, so as to improve the service life of circular flat die steel rolled to.
(3) the V and Mo content in D2 steel is higher than that of Cr12MoV steel has better performance, while conventional Cr12MoV steel will gradually be replaced.
(4) made of D2 steel rolling wheels, from Taiwan palette die, and Cr12MoV can improve the service life of steel compared to 5 ~6 times.
Analysis comparison of D2 die steel
Domestic Cr12Mo1V1 steel, D2 steel, SKD11 steel of Japan America, although the chemical composition of the three the same. But the performance difference is very big. After heat treatment, domestic steel color slightly orange, the deformation is very large, the actual use of the accident to the fatigue fracture of D2 steel; cold white color, hardness is higher than that of SKD11 steel and SKD11 steel have good toughness. The high stress is easy to appear at the tiny gap; SKD11 steel with bright color, the best comprehensive.
Refer to the corresponding grade of D2 die steel
Chinese GB standard Cr12Mo1V1, ASTM/UNS standard D2/T30402, the international organization for Standardization (ISO) standard 160CrMoV12, German standard DIN material No. 1.2379, Germany DIN standard X155CrMoV12-1, France NF X160CrMoV12, British standard grade BS standard BD2, Japanese JIS standard grade SKD11, Japan Hitachi (HITACHl) standard SLD, Japan Datong (DAIDO) standard DC11, Japan fujikoshi (NACHl) standard CDS11, Austria 100 (BOHLER) standard K110, Sweden (ASSAB) standard XW41