Abstract: In order to develop non-spheroidizing annealing 12Cr1MoV hot rolled wire rod ， based on deformation induced phase transition mechanism， the finishing rolling temperature of 830 ℃ and laying temperature of 800 ℃ were adopted. By inhibiting deformation austenite grain recovery and recrystallization process，increasing deformation energy storage， thereby promoting austenite decomposed into ferrite and pearlite. Meanwhile in stage controlled cooling was realized with adjusting the air-cooled roller speed， the quenching microstructures were completely eliminated because prolonging the holding time between 630 ℃ and 750 ℃. The test results are that the tensile strength of 12Cr1MoV hot-rolled wire rod was reduced from 576 MPa to 520 MPa， while reduction of area increasing from 66% to 74%.The elimination of quenched microstructure significantly optimizes the deformation ability of wire rod ，and also avoided holes in the cross-section center or draw break which caused by a small or minimal martensite microstructure are unable to cooperate with deformation . Plastic cracking has not occurred after batch use of multiple specifications by users.

Key words: Boiler Flat Steel, 12Cr1MoV Steel, Deformation Energy, Deformation Induced Phase Transition, Martensite

摘要： 为开发免球化退火扁钢用12Cr1MoV热轧盘条，基于形变诱导相变机理，采用830 ℃终轧温度和800 ℃的吐丝温度。通过抑制形变奥氏体晶粒回复和再结晶过程增加形变储能，促进奥氏体分解为铁素体和珠光体组织。同时配合轧后风冷辊道速度调节，实现分段控制冷却，延长盘条在630～750 ℃区间停留时间，可完全消除盘条中马氏体和贝氏体组织。试验结果为：热轧盘条抗拉强度从576 MPa降至520 MPa，断面收缩率从66%提高至74%，淬火组织的消除使盘条变形能力明显优化，避免少量或极少量马氏体组织无法协同变形而产生的心部孔洞或拉拔断裂，经用户多规格批量使用，未发生塑性开裂问题。

关键词: 锅炉扁钢, 12Cr1MoV钢, 形变能, 形变诱导相变, 马氏体