27MnCrV oil casing pipe

27MnCrV oil casing Toughening heat treatment process

  

27MnCrV new steel production the oil casing TP110T steel sleeve, the conventional production TP110T steel grade oil pipe sets steels is 29CrMo44., And 26CrMo4. With respect to the latter two, 27MnCrV contains less Mo element, can greatly reduce the production cost. However quenching austenite normal process production 27MnCrV high temperature temper brittleness, low impact toughness and unstable. 

 

Commonly used two methods to solve such problems processing: First, the rapid cooling method using tempered to avoid high temperature brittleness for toughness. , The second sub-temperature quenching method to effectively improve the harmful elements and impurities, improve toughness by not fully austenitic steel grades. The first method, the heat treatment equipment requirements are relatively stringent, the need to add extra cost. 

 Pipechn co.,ltd

27MnCrV steel AC1 = 736 ℃, AC3 = 810 ℃, sub-temperature quenching heating temperature between 740-810 ℃, select. Sub-temperature quenching select the heating temperature of 780 ℃, holding time of quenching 15min; quenching and tempering a select temperature of 630 ° C, tempering heating holding time 50min. Retain part of undissolved ferrite state As Subcritically quenching heated in the α + γ two-phase region, quenching, while maintaining a higher strength, toughness is improved. 

 

The temperature quenching than conventional low temperature, reducing the quenching stress, thus reducing the quenching of the deformation, thus ensuring the smooth operation of the production of the heat treatment, but also provides a good raw material for subsequent car Sijia. 

 

The process pipe processing plant in Tianjin Pipe was applied, warranty data show that the heat-treated steel pipe yield strength Rt0.6 820-860MPa, tensile strength Rm 910-940MPa, impact toughness Akv in 65-85J invulnerability 100% passing performance. The data show that, 27MnCrV is fairly high-quality, high-grade oil casing steel pipe, on the other hand, that the sub-temperature quenching process is an excellent way to avoid high temperature brittleness in the production of steel products.