1300MPa-grade ultrahigh-strength Zn-Ni composite plating hot-formed steel and production method thereof

• Main Authors: HU KUANHUI, GE RUI, HUANG DAOBING, ZHOU SHAOYUN, FENG GUANWEN, CAI JIE
• Format: Patent
• Language: Chinese; English
• Published: 21.09.2021
• Subjects: ALLOYS; APPARATUS THEREFOR; CHEMISTRY; ELECTROFORMING; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; 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; PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention relates to 1300MPa-grade ultrahigh-strength Zn-Ni composite plating hot-formed steel. The steel comprises, by mass percentage, 0.17%-0.20% of C, 0.21%-0.25% of Si, 1.0%-1.3% of Mn, smaller than or equal to 0.010% of P, smaller than or equal to 0.008% of S, 0.015%-0.060% of Als, 0.19%-0.24% of Cr, 0.021%-0.025% of Ti, 0.002%-0.003% of B, 0.021%-0.025% of Nb, 0.021%-0.025% of V, smaller than or equal to 0.005% of N and the balance Fe and other inevitable impurity elements. A production method comprises the steps of molten iron desulfurization, electric furnace or converter smelting, refining, continuous casting, blank casting, rolling, cooling treatment, cleaning, nickel electroplating, zinc electroplating and uncoiling, blanking and austenitizing. The surface oxidation in the hot stamping process can be reduced, the corrosion resistance of a product is improved, and microcrack diffusion can be effectively avoided. 本发明涉及1300MPa级超高强度Zn-N i复合镀层热成型钢，各成分的质量百分比为：C：0.17～0.20，Si：0.21～0.25，Mn：1.0～1.3，P：≤0