Heat treatment method for grain refinement of NiCrMoV steel forging piece
A heat treatment method and grain refinement technology, which is applied in the field of heat treatment of forgings, can solve problems such as the difficulty in judging the internal quality of forgings, the decline in mechanical properties of forgings, and the interference of defect signals, so as to ensure performance, improve the structure state, and improve stability. Effect
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Embodiment 1
[0032] Example 1, Example 2 and Example 3 Chemical composition of forgings (mass percentage, wt-%)
[0033]
C
Si
Mn
P
S
Cr
Ni
Mo
V
Examples 1, 2
0.34
0.32
0.29
0.005
0.004
1.24
3.26
0.38
0.14
[0034] Example 3
0.37
0.11
0.21
0.007
0.005
1.39
3.23
0.33
0.13
[0035] Example 1:
[0036] Example 1 is a test conducted under laboratory conditions to verify the effectiveness of the technical solution of the present invention. The sample is a metallographic sample of 15×15×15mm. The specific technical scheme is:
[0037] The high temperature normalizing process at 950°C is as follows: heat the metallographic sample at a heating rate of 60°C / hour to 360°C for 0.5 hours, and then heat it to 950°C at a heating rate of 150°C / hour (simulating heating conditions for large forgings) , Heat preservation for 1.5 hours, furnace cooling (simulating air cooling conditions of large forgings) to the sample surface temperature of 200 ℃.
[0038...
Embodiment 2
[0042] The chemical composition of Example 2 is the same as that of Example 1. The diameter of the forging is 450mm. After forging, the following procedures are adopted: 950°C high temperature normalizing step, 900°C high temperature normalizing step, and softening annealing step;
[0043] The specific technical scheme of the heat treatment method is:
[0044] The 950℃ high-temperature normalizing process is: after the forging process, the forgings are directly heated to the furnace, the furnace temperature is 650℃, kept for 5 hours, the furnace is air-cooled to 200℃ on the surface of the forging, and the furnace is loaded. The furnace temperature is kept at 210℃. 5 hours, heating to 370°C at a heating rate of 60°C / hour for 3 hours, then heating the furnace to 950°C with maximum power, holding at 950°C for 5 hours, and air cooling to 200°C of the forging surface;
[0045] 900°C high temperature normalizing process: install the furnace, keep the furnace temperature at 210°C for 5 hour...
Embodiment 3
[0049] Forgings with a diameter of 1m use the following procedures after forging: 950℃ high temperature normalizing procedure, 900℃ high temperature normalizing procedure, and softening annealing procedure;
[0050] The specific technical scheme of the heat treatment method is:
[0051] The 950℃ high-temperature normalizing process is: after the forging process is finished, the forging is directly heated to the furnace, the furnace temperature is 640℃, kept for 10 hours, the furnace is air-cooled to 200℃ on the surface of the forging, and the furnace is loaded, and the furnace temperature is kept at 220℃. For 10 hours, heat to 360°C at a heating rate of 40°C / hour for 6 hours, then heat the furnace to 950°C with maximum power, keep it at 950°C for 10 hours, and air-cool to the surface temperature of the forging to 200°C;
[0052] 900°C high temperature normalizing process: install the furnace, keep the furnace temperature at 220°C for about 10 hours, heat to 360°C at a heating rate of...
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