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Annealing process of 1.2746, namely 45NiCrMoV or 4CrNi4MoV die steel
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An annealing process and die steel technology, applied in the field of metal heat treatment, can solve the problems of reducing production efficiency and equipment utilization, long annealing time, and high energy consumption, and achieve the effect of shortening turnaround time and improving equipment utilization.
Active Publication Date: 2021-03-09
FUSHUN SPECIAL STEEL SHARES
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The heat preservation time of this process is as long as 200h, plus the heating and cooling time, the total time reaches 260h~300h, the annealing time is long, the energy consumption is high, and the production efficiency and equipment utilization rate are reduced.
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Embodiment 1
[0020] 1.2746 flat steel, the size is 60mm in thickness, 120mm in width, 6.0m in length, and weighs 16.8 tons. After the steel is out of the pit, measure the hardness (HBW) 410, 425, 435;
[0021] Carry out the first annealing: heating with gas in the continuous roller bottom heating furnace, the heating rate is 80°C / h, heating to 780°C for 8 hours; after the heat preservation is completed, slowly cool to 680°C at a speed of 35°C / h and hold for 25 hours , after cooling slowly to 250°C at a rate of 35°C / h, take it out of the furnace and cool to room temperature; the hardness (HBW) is 370, 386, 410.
[0022] Carry out the second annealing: heating with gas in a continuous roller hearthheating furnace, the heating rate is 80°C / h, heating to 630°C for 36 hours; Cool to room temperature; test hardness (HBW) is 270, 276, 280.
Embodiment 2
[0024] 1. 2746 flat steel, with a thickness of 58mm, a width of 118mm, a length of 6.0m, and a weight of 13.7 tons. After the steel is out of the pit, measure the hardness (HBW) 414, 432, 438;
[0025] Carry out the first annealing: heating with gas in a continuous roller bottom heating furnace, the heating rate is 80°C / h, heating to 780°C for 8 hours; after the heat preservation is completed, slowly cool to 650°C at a speed of 40°C / h and hold for 25 hours , after cooling slowly to 230°C at a rate of 30°C / h, take it out of the furnace and cool to room temperature;
[0026] Carry out the second annealing: heating with gas in a continuous roller hearth heating furnace, the heating rate is 80°C / h, heating to 630°C and keeping it for 36h; Cool to room temperature; test hardness (HBW) is 268, 270, 275.
Embodiment 3
[0028] 1.2746 flat steel, the size is 44mm in thickness, 110mm in width, 6.0m in length, and weighs 12.6 tons. After the steel is out of the pit, measure the hardness (HBW) 411, 430, 437;
[0029] Carry out the first annealing: heating with gas in a continuous roller bottom heating furnace, the heating rate is 80°C / h, heating to 740°C for 6 hours; after the heat preservation is completed, slowly cool to 650°C at a speed of 40°C / h and hold for 30 hours , after cooling slowly to 225°C at a rate of 30°C / h, take it out of the furnace and cool to room temperature; the hardness (HBW) is 380, 388, 410.
[0030] Carry out the second annealing: heating with gas in a continuous roller hearth heating furnace at a heating rate of 80°C / h, heating to 650°C for 36 hours; Cool to room temperature; test hardness (HBW) is 266, 269, 275.
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Abstract
The invention provides an annealing process of 1.2746, namely 45NiCrMoV or 4CrNi4MoV die steel. The annealing process is realized through the following technical scheme. For 1.2746 (45NiCrMoV or 4CrNi4MoV) die steel, the heating homogenization time is calculated according to the effective thickness of the steel, and austenite homogenization heating is carried out above Ar1; austenitizing is carried out by adopting a continuous roller bottom heating furnace, crystal grains are coarsened, the temperature is slowly cooled to below A1 line for annealing, and is then slowly cooled below the martensite point, furnace discharging is carried out and the temperature is cooled to the room temperature; and then, annealing is continuously carried out below the annealing temperature, and finally, the temperature is slowly cooled below the martensite point, furnace discharging is carried out and the temperature is cooled to the room temperature. The technical key point of the annealing process is asfollows: after the second-stage annealing, the hardness is greatly reduced, it is proved that austenitizing and annealing lay a good foundation for the second-stage annealing. The annealing process has the following advantages that on the premise that the annealing hardness reaches the standard, the turnover time of a heat treatment furnace is shortened by one half, the equipment utilization rateis increased, and energy conservation and environmental protection are achieved.
Description
technical field [0001] The invention belongs to the technical field of metal heat treatment, and in particular relates to an annealing process for 1.2746 (45NiCrMoV or 4CrNi4MoV) die steel. Background technique [0002] 1.2746 belongs to the German standard alloytool steel, the implementation standard is DIN EN ISO4957-2001, its chemical composition (%) is: carbon: 0.41~0.49, silicon: 0.15~0.35, manganese: 0.60~0.80, phosphorus not more than 0.025, sulfur Not more than 0.020, chromium: 1.40~1.60, molybdenum: 0.73~0.85, vanadium: 0.45~0.55, nickel: 3.80~4.20, equivalent to domestic 45NiCrMoV or 4CrNi4MoV, which belongs to cold work die steel; square flat steel or round bar For cuttingprocessing, the delivery state is usually delivered in an annealed state, the annealed hardness (HBW) is not greater than 295, and the target value is about 270. In the process of localization, in order to achieve the annealing hardness (HBW) not greater than 295, the annealing process of the ...
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