What is the production process of hot rolled steel strip for oil casing pipe

J55Oil Casing Pipe is a kind of tubing that has been used as the lining of oil well wall for a long time.It is connected to the thousands of meters long pipe string through special threads.During downhole cementing,oil casing pipe string is mainly affected by external extrusion force,internal pressure and axial tensile load,and is completed by perforation method.It also bears the high temperature and large energy instantaneous impact load generated by perforation explosion.

 

Through the analysis of the use of Oil Casing Pipe and the comprehensive judgment of its main failure forms,the oil casing pipe manufacturer believes that the performance of the casing should be high strength,high toughness,high extrusion resistance and high thread connection strength.The advantages of straight seam welded sleeve are uniform wall thickness,high precision of several inches,10%~1.5%higher extrusion crushing resistance than seamless pipe of the same steel grade,low carbon content of material,no hole breaking after perforation,and low price.

 

The process flow of hot rolled steel strip for J55Oil Casing Pipe is as follows:hot metal magnesium based desulfurization-top bottom combined blowing converter-alloying-LF refining-calcium feeding line-soft blowing-medium and wide band conventional grid slab continuous casting-slab cutting-heating furnace-roughing 5 passes of rolling-heat preservation-finishing 7 passes of controlled rolling-laminar cooling-coiling and packaging.

 

According to the use of J55Oil Casing Pipe steel strip,considering its strength,plasticity,toughness and weldability,it is difficult to improve the strength of J55 grade steel strip with low-carbon high manganese steel strip,but the plasticity and toughness are good.Under the condition of controlled rolling and controlled cooling,it is feasible to use the existing technology to produce hot rolled strip steel for J55Oil Casing Pipe.At present,it has batch production capacity.