Preparation method of ultrahigh-strength high-plasticity high-temperature-oxidation-resistant steel through hot stamping forming
A technology of hot stamping and high temperature oxidation resistance, which is applied in heat treatment equipment, heat treatment furnaces, manufacturing tools, etc., and can solve problems such as oxidation and strong plasticity
Active Publication Date: 2021-07-13
UNIV OF SCI & TECH BEIJING
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AI-Extracted Technical Summary
Problems solved by technology
The invention discloses a preparation method of ultrahigh-strength high-plasticity high-temperature-oxidation-resistant steel through hot stamping forming. The steel comprises the following components of, in percentage by mass, 0.25%-0.45% of C, 1.0%-3.0% of Si, 3.0%-5.5% of Mn, less than or equal to 2.5% of Ni, 0.8%-2.0% of Al, 0.04%-0.10% of Nb, less than or equal to 0.5% of Mo, less than or equal to 0.005% of B, less than or equal to 0.04% of Ti, less than or equal to 0.1% of RE, less than or equal to 0.015% of P, less than or equal to 0.015% of S, less than or equal to 1.5% of Cu or less than or equal to 0.08% of V or less than or equal to 0.5% of W, or a combination of a plurality of components, and the balance Fe, wherein Si/Al satisfies 1.2-2.2, Si + Al is greater than 2.5, and Mn is greater than Al + Si. The hot-formed steel is obtained through smelting, pouring, forging, hot rolling, air cooling or simulated curling, acid pickling, cold rolling, annealing and hot forming. The preparation process of the hot-formed steel is simple, after component optimization and hot stamping forming, the structure comprises a martensite matrix and 2.0%-10.0% residual austenite, it can be guaranteed that the tensile strength is larger than or equal to 1900 MPa, the yield strength is larger than or equal to 1200 MPa, the total ductility is larger than or equal to 9.5%, meanwhile, the high-temperature oxidation resistance is remarkably improved, it can be guaranteed that after a steel plate is heated to a temperature smaller than or equal to 950 DEG C in air, and subjected to heat preservation for shorter than or equal to 5 min, and after hot stamping forming, the thickness of an oxide layer is smaller than or equal to 4.2 micrometer, and an expensive AlSi coating can be omitted, so that the cost is reduced, and the production efficiency is improved.
Furnace typesHeat treatment furnaces
Plastic propertyPost oxidation +14
- Experimental program(3)
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