Process for improving stress cracks of medium carbon alloy cold forging steel hot-rolled billet
A technology of stress cracking and cold heading steel, which is applied in the technical field of improving the stress cracking of medium carbon alloy cold heading steel hot rolling slabs, can solve the problems of increasing the stability of supercooling and reducing the critical cooling rate, etc., to ensure hardenability, Eliminate the internal stress of the billet and ensure high quality effect
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Embodiment 1
[0030] Embodiment 1: The process for improving the stress cracks of the hot-rolled slab of the medium-carbon alloy cold heading steel is specifically described as follows.
[0031] (1) Slow cooling before heating: The XGML40Cr steel bloom obtained by casting is put into a slow cooling pit at 300°C for 72 hours.
[0032] (2) Sectional heating: the slowly cooled bloom is heated by a regenerative heating furnace; the heating temperature of the first section is 850°C, the heating temperature of the second section is 1030°C, and the soaking temperature of the soaking section is 1100°C °C; the total heating time is controlled at 5 hours, and the holding time of the high temperature section is controlled at 1.5 hours.
[0033] (3) Billet rolling: use 9 rolling passes to roll a 280*325mm bloom into a 160*160mm hot-rolled billet; the first four passes use a reduction of 50mm, and the middle four passes use a reduction of 30mm The reduction amount, the last pass uses a reduction amount...
Embodiment 2
[0036] Embodiment 2: The process for improving the stress cracks of the hot-rolled slab of the medium-carbon alloy cold heading steel is specifically described as follows.
[0037] (1) Slow cooling before heating: The XGML40Cr steel bloom obtained by casting is put into a slow cooling pit at 100°C for 72 hours.
[0038] (2) Sectional heating: the slowly cooled bloom is heated by a regenerative heating furnace; the heating temperature of the first section is 900°C, the heating temperature of the second section is 1060°C, and the soaking temperature of the soaking section is 1120°C ℃; the total heating time is controlled at 4 hours, and the holding time of the high temperature section is controlled at 1.5 hours.
[0039] (3) Billet rolling: use 9 rolling passes to roll a 280*325mm bloom into a 155*155mm hot-rolled billet; the first four passes use a reduction of 55mm, and the middle four passes use a reduction of 25mm The reduction amount, the last pass uses a reduction amount ...
Embodiment 3
[0042] Embodiment 3: The process for improving the stress cracks of the hot-rolled slab of the medium-carbon alloy cold-heading steel is specifically described as follows.
[0043] (1) Slow cooling before heating: The XGML40Cr steel bloom obtained by casting is put into a slow cooling pit at 500°C for 60 hours.
[0044](2) Sectional heating: the slowly cooled bloom is heated by a regenerative heating furnace; the heating temperature of the first section is 950°C, the heating temperature of the second section is 1130°C, and the soaking temperature of the soaking section is 1200°C ℃; the total heating time is controlled at 3h, and the holding time of the high temperature section is controlled at 1h.
[0045] (3) Billet rolling: use 9 rolling passes to roll a 280*325mm bloom into a 155*155mm hot-rolled billet; the first four passes use a reduction of 60mm, and the middle four passes use a reduction of 20mm The reduction amount, the last pass uses a reduction amount of 20mm.
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