A kind of ultra-low-carbon high-strength high-plasticity martensitic steel and preparation method thereof

Abstract

An ultra-low-carbon, high-strength, high-plasticity martensitic steel and a preparation method thereof, belonging to the field of steel preparation, the mass percentage of the chemical composition of the martensitic steel is: C: 0.01-0.05%, Si: 0.2-0.5%, Mn: 0.5~0.8%, Cr: 0.8~1.2%, Cu: 2.0~4.0%, Ni: 10.0~11.0%, V: 0.05~0.15%, Mo: 0.5~0.9%, Al: 0.2~0.5%, P: ≤ 0.02%, S: ≤0.02%, the balance is Fe. Adding Cu, Ni, Al and Mn elements to the alloy of the present invention can precipitate rich Cu and Ni during the aging heat treatment process. 3 Al(Mn) phase, so as to realize the high strength of the alloy and excellent welding performance; the martensitic steel of the present invention does not need rolling, cryogenic treatment, simple heat treatment process, high production efficiency, and easy realization.

Description

A kind of ultra-low carbon high strength high plastic martensitic steel and preparation method thereof technical field The invention belongs to steel preparation field, particularly a kind of ultra-low carbon high strength high plastic martensitic steel and preparation method thereof Law. Background technique With the continuous development of modern science and technology, the application field of high-strength steel is continuously developed, and people's pursuit of steel performance Demand is also increasing. In the field of high-strength steel preparation, the effect of strengthening methods on materials is decisive. The chemical method mainly depends on the solid solution strengthening of carbon and the precipitation strengthening of alloy carbides, and the strength of steel is linearly related to the content of carbon. When the strength reaches a certain level, the carbon content also increases, which has a great danger to the welding performance and ease of p...

AI Technical Summary

Problems solved by technology

In the field of high-strength steel preparation, the effect of the strengthening method on the material is decisive. The strengthening method of traditional high-strength steel mainly relies on solid solution strengthening of carbon and precipitation strengthening of alloy carbides. The strength of steel has a linear relationship with the content of carbon. When When the strength reaches a certain level, the carbon content also increases, which has great harm to the welding performance and easy processing performance. In the acceptable range of welding ability, the strength of steel is greatly limited.

Images