LSAW Steel Pipe

 　　In addition to the emergence of oil casing, it can also be used as a pipeline for transporting raw materials. To enhance the quality of oil casing, every link in the production process is particularly important. In particular, the temperature control during the period must be strictly followed. Regulations are mastered. Under normal circumstances, oil casing uses the sub-temperature quenching method. 　　Many friends will wonder why it is not an ordinary quenching method? Because the common quenching method will cause a large amount of residual stress inside the workpiece, which enlarges the brittleness, the subsequent processing is not so convenient. The sub-temperature quenching is to prevent the excessive brittleness of the oil casing from affecting the subsequent process. Each kind of steel has its heating temperature and time during heat treatment. As long as the performance of the workpiece can be improved and improved, the purpose of heat treatment will be achieved. 　　Heat ...

　　Petroleum special pipe is mainly used for drilling of oil and gas wells and transportation of oil and gas. It includes petroleum drilling pipe , petroleum casing, and sucker pipe. Oil drill pipe is mainly used to connect drill collar and drill bit and transmit drilling power. Oil casing is mainly used to support the borehole wall during and after drilling to ensure the normal operation of the entire oil well during and after the drilling. The sucker pipe mainly transports oil and gas from the bottom of the well to the surface. 　　Oil casing is the lifeline to maintain oil well operation. Due to the different geological conditions and the complex state of the downhole force, the combined effects of tensile, compressive, bending and torsional stresses on the pipe body put forward higher requirements on the quality of the casing itself. Once the casing itself is damaged for some reason, it may lead to a reduction of the entire well or even scrap. 　　According to the strength of the st...

　　The American Petroleum Institute API standard specifically targets oil and gas: casing, tubing and line pipe standards used in industry. In the standard, the casing and tubing steel grades are divided into several grades, namely H-40, J-55, K-55, N-80, L-80, C-90, T-95, P-110, Q- 125, each level has a different heat process. In API 5CT, the raw materials were divided into four groups. The first group is H, J, K, N, the second group is C, L, T, the third group is P, and the fourth group is Q. The numbers represent the intensity level, and the codes K, N, L, C, and T represent nothing to explain. The following numbers represent the minimum yield strength of the material. The unit is KSI (thousands per square inch), H, N, K, J is the first group, the yield strength of the material is 200 MPa, L, C, T are two groups, the yield strength of the material is 100 MPa, P110 is the third group, and Q125 is the fourth group. 　　The API is divided into 4 groups. 　　The first group represents an...