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H13 heat treatment process and vacuum heat treatment equipment

H13 is American H series hot work die steel, similar to China 4Cr5MoSiV1 (GB) steel grade, while China Cr12Mo1V (GB) is a ledeburite steel, similar to American AISI and ASTM standard steel grade D2. The two are completely different. H13 is hot For die steel, the final heat treatment is generally quenching + high temperature tempering, while Cr12MoV is cold work die steel, and the final heat treatment is generally quenching + low temperature tempering.

The heat treatment process of Cr12MoV varies according to the application. It can be quenched at high temperature + tempered at high temperature to improve toughness, or it can be quenched at low temperature + low temperature tempered to increase wear resistance. The above two kinds of steels are generally tempered once, and in some cases they are tempered 3 times. The specific situation is analyzed in detail, and the heat treatment process is determined according to the specific technical requirements of the workpiece.

1. Quenching specification: temperature 1020-1050 degrees, cooling medium: oil or air, hardness HRC: 56-58

2. Tempering specification: temperature 560-580 degrees, cooling: air cooling, tempering hardness HRC: 47-49

3. Two times of tempering are usually used, and the temperature of the second tempering should be 20 degrees lower than that of the first.

Pre-heat treatment The H13 steel and die blanks available on the market have been annealed and heat treated in the steel plant to ensure that they have a good metallographic structure, appropriate hardness, and good workability. No further annealing is required. However, the original structure and performance were destroyed after the modification forging by the manufacturer, and the forging stress was increased, and re-annealing was necessary. The isothermal spheroidizing annealing process is: heating and holding at 860～890℃ for 2h, cooling to 740～760℃ and isothermal 4h, cooling the furnace to about 500℃ and then taking it out. The vacuum heat treatment H13 has the characteristics of energy saving and environmental protection.

Quenching and tempering require mold quenching process specification with good toughness: heating temperature 1020～1050℃, oil cooling or air cooling, hardness 54～58HRC; mold quenching process specification requiring thermohardness mainly, heating temperature 1050～1080℃, oil cooling , Hardness 56～58HRC.

Recommended tempering temperature: 530～560℃, hardness 48～52HRC; tempering temperature 560～580℃; hardness 47～49HRC. Tempering should be carried out twice. When tempered at 500°C, the secondary hardening peak of tempering appears, the tempering hardness is the highest, the peak is around 55HRC, but the toughness is the worst. Therefore, the tempering process should avoid about 500 ℃. According to the needs of the mold, it is better to temper in the range of 540～620℃. Quenching heating should be preheated twice (600～650℃, 800～850℃) to reduce the thermal stress generated during the heating process.

The vacuum heat treatment furnace RVGQ series high pressure air-cooled vacuum furnace produced by Shanghai Gehang Vacuum Technology Co., Ltd. is used for the heat treatment of H13, D2, and SKD61 materials with the characteristics of good hardenability and high hardness.