Oil Casing Pipe Heat Treatment Technology

After the oil casing pipe is heat treated,it can effectively improve the impact toughness,tensile strength,damage resistance,etc.of the oil casing pipe,ensuring its good value in use.Oil Casing Pipe is a necessary pipe for drilling oil and natural gas,which should have good performance in use.Oil Casing Pipe uses different temperature controls in different temperature sections.Heating needs to be carried out according to a certain temperature.27MnCrV steel AC1=736℃,AC3=810℃.The tempering temperature after quenching is 630℃.The tempering heating and holding time is 50min.The heating temperature during sub temperature quenching is 740-810℃.The heating temperature is 780℃,and the holding time of quenching heating is 15minα+γThe two-phase zone is heated,and the storage part is quenched in the state of undissolved ferrite.While adhering to higher strength,the toughness is improved.

 

The heat treatment of oil casing pipe needs to be strictly carried out to ensure that the oil casing pipe produced has good product quality and performance,shows good use value and performance in use,adheres to high strength and toughness,and conducts heat treatment in different ways.At the same time,the low temperature quenching is lower than the conventional temperature,which reduces the quenching stress,thus reducing the quenching deformation,thus ensuring the smooth operation of the oil casing pipe heat treatment production,and providing good raw materials for subsequent wire turning processing.

 

At present,this process has been applied in the pipe processing plants of different steel pipes.The quality assurance data shows that the tensile strength of steel pipes after heat treatment Rm910-940MPa,yield strength Rt0.6820-860MPa,and the damage resistance are 100%qualified.The data of impact toughness Akv65-85J indicate that 27MnCrV steel pipes are high quality oil casing pipes.On the other hand,it also indicates that the sub temperature quenching process is an excellent method to avoid high temperature brittleness in the production of steel products.