摘要
Φ22~25 mm HRB400(/%:0.20~0.25C,0.25~0.43Si,0.90~1.15Mn)钢筋和Φ18~28 mm HRB500(/%:0.20~0.25C,0.50~0.65Si,1.38~1.53Mn,0.05~0.07V)高强度钢筋的生产工艺流程为100 t顶底复吹转炉-出钢脱氧合金化-钢包底吹氩气-160 mm×160 mm方坯连铸-连轧。通过对HRB400钢筋和HRB500高强度钢筋的组织观察,分析了V和Nb碳化物在钢中的析出行为及对性能的影响,提出了HRB400钢筋的表面淬火自回火组织层宜控制在1 mm以下和HRB500钢筋采用V-Nb复合微合金化强化改进措施。通过控制钢中C含量0.18%~0.23%,钢筋水冷后温度从650℃提高到700℃,HRB500钢筋采用V+Nb含量0.05%~0.07%复合强化等工艺措施。Φ22~25 mm HRB400钢筋屈服和抗拉强度分别从460~510 MPa和580~610 MPa下降至440~490MPa和570~620 MPa,Φ18~28 mm HRB500钢筋屈服和抗拉强度分别从560~610 MPa和670~700 MPa提高至570~620 MPa和680~710 MPa,显著提高了钢筋的综合力学性能。
The production process flowsheet of 022 - 25 mm steel reinforced bar HRB400 （/% ： 0. 20 ~ 0. 25C, 0. 25 -0. 43Si, 0. 90 - 1.15Mn） and Φ18 ~ 28 mm high strength steel reinforced bar HRBS00 （/% ： 0. 20 ~ 0. 25C, 0. 50 -0. 65Si, 1.38 - 1.53Mn, 0. 05 -0. 07V） is 100 t top and bottom combined blowing converter-deoxidizing and allo- ying during tapping-ladle bottom argon blowing- 160 mm × 160 mm billet casting-continuous rolling. By observation on structure of reinforced bar HRB400 and high strength reinforced bar HRB500 the precipitation behavior and the effect of V and Nb carbide precipitation on properties of steel are analyzed, and the strengthening measures including to control the self-tempering structure layer at surface of HRB400 steel reinforced bar less than 1 mm and using V-Nb composite micro-alloying for HRB500 steel reinforced bar are put forward. With controlling carbon content in steel 0. 18% ~ 0. 23% , increasing steel bar temperature after water cooling to 700 ℃from original 650 ℃, and using V ＋ Nb =0. 05% -0.07% to composite-strengthen for HRB500 steel bar, the yield and tensile strength of Φ22 ~25 mm bar of HRB400 steel decreases respectively from 460- 510 MPa and 580 ~ 610 MPa to 440 -490 MPa and 570 -620 MPa, and the yield and tensile strength of of Φ18 - 28 mm bar of HRB500 steel increases respectively from 560 ~ 610 MPa and 670 - 700 MPa to 570 - 620 MPa and 680 -710 MPa obviously to increase the comprehensive mechanical properties of steel.
出处
《特殊钢》
北大核心
2017年第5期53-56,共4页
Special Steel
关键词
HRB400
HRB500
高强度钢筋
组织
力学性能
强化措施
HRB400, HRB500, High Strength Reinforced Steel Bar, Structure, Mechanical Properties,Strengthening Measures
