D2 steel is an air quenching, high carbon, high chromium tool steel. Have high wear resistance, resistance to wear resistance. After heat treatment, the hardness can reach 55-62 HRC, and can be processed in annealing state. D2 steel is almost unveiled during proper hardening. The high chromium content of D2 steel has a mild corrosion resistance under hardened conditions.
D2 first appeared during World War II, belonging to non-stainless steel categories, semi-stainless steel tool steel. Today, D2 is very popular with tool manufacturers, knives and tools, almost every tool manufacturer uses D2. In addition to the Songdian male teacher uses D2, Bob Dozier is also one of the manufacturers of D2. Benchmade butterflies have also begun to use D2, BESS in its Axis AFCK, also use D2 steel.
Sometimes D2 will also be called “semi-stainless steel”. It has a relatively high chromium content (12%), but this number is not enough to classify it within stainless steel. However, it is more resistant to some other carbon steel, which has excellent wear resistance. D2 is much rugged than ATS-34, but it is not as strong as other non-stainless steel mentioned here. Wear resistance, almost no rust, good toughness, these binds together, so that D2 becomes an ideal choice for a variety of tools.
But if you want a steel material that works, you can consider the chromium content of 5%, which is easy to processed A2 tool steel. D2 steel can be applied in: stamping or forming mold, punching, molded roll, knife, scissors, cutting machine, tool, tire crusher, etc.
Composition of AISI D2 Steel:
Slowly heated to 700 ° C, then quickly heated to 900/1040 ° C, and D2 was not forged at a temperature of less than 925 ° C. It is necessary to heat it usually to maintain the appropriate forging temperature. Cool slowly after forging.
Uniformly heated to 843/871 ° C, then slowly cooled at a rate of no higher than 10 ° C / h. After D2 is annealed, the maximum hardness of 240 Bello can be achieved.
D2 tool steel is very sensitive to overheating during quenching, and the temperature cannot be overheated. The preheating is slow to 750/780 ° C, then soaked; continued to heat the final hardening temperature of 1000/1030 ° C, quenching in the oil or cooled in the air.
Evenly heated to the desired temperature and maintains thickness per centimeter in 25 minutes. After cooling to room temperature in the middle, D2 can be double-tempered at about 15 ° C below the first temper.
D2 steel back to fire: