Nitrate heat treatment process for drill rod
A drill rod and nitrate technology, which is applied in heat treatment baths, heat treatment furnaces, heat treatment equipment, etc., can solve the problems that the hardness control requirements of the drill rod cannot be met, the flat pin groove and the middle part of the drill rod are broken, and the damage rate of the drill rod is high. Achieve the effect of high toughness, low drill rod damage rate and low production cost
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Embodiment 1
[0016] see figure 1 , the present invention provides a kind of technical scheme: a kind of drilling rod nitrate heat treatment process, the drilling rod tail is 1, the drilling rod flat pin groove part is 2, and the drilling rod tip is 3, comprising the following steps:
[0017] S1. Normalizing treatment of drill rod: open the door of the normalizing furnace and put the drill rod vertically into the normalizing furnace, raise the temperature of the normalizing furnace to 880°C and start keeping warm for 260 minutes. After keeping warm, take it out of the furnace and cool it to room temperature;
[0018] S2. Quenching treatment of drill rods: put the drill rods cooled to room temperature vertically into the quenching furnace, raise the temperature of the quenching furnace to 860°C and start to keep warm for 110 minutes. After the heat preservation is over, quickly sink the drill rods vertically Quenching and cooling in quenching liquid;
[0019] S3, drill rod tempering treatme...
Embodiment 2
[0025] see figure 1 , the present invention provides a kind of technical scheme: a kind of drilling rod nitrate heat treatment process, the drilling rod tail is 1, the drilling rod flat pin groove part is 2, and the drilling rod tip is 3, comprising the following steps:
[0026] S1. Normalizing treatment of drill rod: open the furnace door of the normalizing furnace and put the drill rod vertically into the normalizing furnace, raise the temperature of the normalizing furnace to 880°C and start to keep warm for 320 minutes. After keeping warm, take it out of the furnace and cool it to room temperature;
[0027] S2. Quenching treatment of drill rods: Put the drill rods cooled to room temperature vertically into the quenching furnace, raise the temperature of the quenching furnace to 860°C and start to keep warm for 320 minutes. After the heat preservation is over, quickly sink the drill rods vertically Quenching and cooling in quenching liquid;
[0028] S3, drill rod tempering...
Embodiment 3
[0034] see figure 1 , the present invention provides a kind of technical scheme: a kind of drilling rod nitrate heat treatment process, the drilling rod tail is 1, the drilling rod flat pin groove part is 2, and the drilling rod tip is 3, comprising the following steps:
[0035] S1. Normalizing treatment of drill rod: open the door of the normalizing furnace and put the drill rod vertically into the normalizing furnace, raise the temperature of the normalizing furnace to 880°C and start heat preservation. The heat preservation time is 290 minutes. After heat preservation, take out the furnace and cool to room temperature;
[0036] S2. Quenching treatment of drill rods: put the drill rods cooled to room temperature vertically into the quenching furnace, raise the temperature of the quenching furnace to 860°C and start to keep warm for 230 minutes. After the heat preservation is over, quickly sink the drill rods vertically Quenching and cooling in quenching liquid;
[0037] S3,...
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