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1) should pay attention to the location of the workpiece to ensure uniform heating, to prevent overheating. Use gas or natural gas furnace, be careful not to make the nozzle or the workpiece heating flame directly.
(2) the axial and thin rod workpiece, should pay attention to the placement of artifacts, in case of deformation.
(3) full annealing furnace charging, generally small and medium carbon steel and low alloy steel workpiece, can not control the heating rate, load has mounted directly to the annealing temperature of the furnace; Can also be low temperature furnace charging, along with the furnace heating up. For medium and high alloy or too big to complicated shape, low temperature furnace charging, segmentation, and control the heating speed is less than 100 ℃ / h.
(4) large workpiece to stress relieving, should be installed at low temperature furnace, slowly heat up, in case the result of the rapid heating thermal stress.
(5) as far as possible when normalizing air-cooling on flat ground. Regardless of the workpiece, when the air cooling will open in a dry place air cooling, shall not be stacked or overlap, shall not be placed in the damp place or there is water, in order to ensure uniform cooling rate, uniform hardness.
(6) material is qualitative different, but the same workpiece heating temperature can be in the same furnace heating.
(7) section workpiece of different size, at the same heating furnace, the small should be placed outside the furnace.
(8) in general, the water temperature is not more than 40 ℃, the oil temperature does not exceed 80 ℃.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 4T-HM516442/HM516410 NTN | 76.2 | 133.35 | 39.688 |
| 4T-47678/47620 NTN | 76.2 | 133.35 | 33.338 |