超低成本、高延伸率及抗应变时效脆化600MPa级调质钢板及其制造方法

• Format: Patent
• Language: Chinese
• Published: 12.03.2021
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

超低成本、高延伸率及抗应变时效脆化600MPa级调质钢板及其制造方法，采用超低C-Mn-(Ti+Nb+V+B)微合金钢的成分体系作为基础，控制Mn/C≥22、(Ni+Mo+Cr)合金化、(％B)-0.714{(％N)-[0.292(％Ti)+0.518(％Al)×ξ]}≥6×10-4，优化控制轧制工艺及在12300≤[1/4(Ac1)+3/4(Ac3)]×(t淬火)≤15900条件下淬火及550～600℃温度之间回火，使成品钢板的显微组织为细小均匀的等轴铁素体晶粒+低碳下贝氏体，钢板平均晶粒尺寸在15μm以下，在获得优良的强韧性、强塑性匹配的同时，钢板具有优良的抗应变时效脆化特性、焊接性及高机械加工性能。 The invention discloses an ultra-low cost, high-elongation and strain ageing embrittlement-resistance 600 MPa grade tempered steel plate and a manufacturing method thereof. According to the manufacturing method of the ultra-low cost, high-elongation and strain ageing embrittlement-resistance 600 MPa grade tempered steel plate, an ultra-low C-Mn-(Ti + Nb + V + B) micro-alloy steel composition system is adopted as a basis, Mn/C is controlled to be greater than or equal to 22, (Ni + Mo + Cr) alloying is controlled, (% B)-0.714 {(% N)-[0.292(% Ti) + 0.518 (% Al)*xi]} is controlled to be greater than or equal to 6*10<-4>, the rolling control process is optimized, at the condition of [1/4(Ac1) + 3/4 (Ac3)]*(t) bei