400 MPa-grade weathering resistant steel and preparation method thereof

• Main Authors: WEN XIAOMING, HAN YU, WANG QUANZHOU, CUI HONGTAO, WU GANG, XU YONG, CHEN HONGYUAN
• Format: Patent
• Language: Chinese; English
• Published: 12.06.2020
• Subjects: ALLOYS; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL; 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; MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PERFORMING OPERATIONS; PUNCHING METAL; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention discloses a 400 MPa-grade weathering resistant steel and a preparation method thereof. The 400 MPa-grade weathering resistant steel adopts composite strengthening by low-cost chromium, nickel and copper, and eliminates the component design of niobium and titanium to obtain a ferrite plus pearlite and trace bainite structure. The structure ensures that a steel sheet has the good toughness product, atmospheric corrosion resistance, excellent forming performance, cold bending performance, welding performance and the like; and the preparation method can produce the low-alloy high-strength steel with high product of strength and elongation and good corrosion resistance by utilizing composite strengthening by the chromium, nickel and copper and combining a controlled rolling and controlled cooling process on the basis of eliminating the niobium and titanium alloy, and meanwhile, the low cost can be realized. 本发明公开了400MPa级耐候钢及其制备方法，其中，所述400MPa级耐候钢采用低成本铬、镍和铜复合强化，取消铌、钛成分设计，获得铁素体加珠光体、微量贝氏体组织，该组织保证钢板具有良好的强