Economical low yield point steel and production method thereof

Abstract

The invention belongs to the technical field of steel, and relates to rolled steel and a production method of the rolled steel, in particular to economical low yield point steel and a production method of the economical low yield point steel. Chemical components of the economical low yield point steel comprise, by weight, 0.03-0.1% of C, 0.1-0.3% of Si, 0.1-0.5% of Mn, 1.0-3.0% of Cr, 0.1-0.2% of Ni, 0.1-0.2% of Cu, 0.01-0.02% of Ti, P<=0.015%, S<=0.0020%, the balance Fe and the balance unavoidable impurity elements. The production method comprises a smelting process, a rolling process and a heat treatment process. The steel has the reasonable chemical component design and the simple production process, and the economical low yield point steel with the stable performance is obtained through the rolling process and the heat treatment process.

Description

technical field [0001] The invention belongs to the technical field of iron and steel, and relates to a steel product and a production method thereof, in particular to an economical low yield point steel and a production method thereof. Background technique [0002] A large number of earthquakes occur every year on the earth, causing huge losses to human life and property. Since the Tangshan earthquake in my country, my country has strictly regulated urban buildings and seismic standards, but there are still a large number of earthquakes during strong earthquakes. Buildings collapsed. In order to reduce the losses caused by earthquakes, researchers have done a lot of research work on the anti-seismic aspects of buildings. With the development of anti-seismic technology of buildings and the in-depth analysis of anti-seismic mechanism, energy dissipation and anti-seismic technology have become the core of anti-seismic technology for buildings. a development trend. [0003] With...

AI Technical Summary

Problems solved by technology

[0005] publication number is: JP2004339548A Japanese patent discloses a kind of 225 MPa or 235 MPa low yield point steel and its production method, the chemical composition weight percent of this product is : C:0.005~0.04%, Si≤0.5%, Mn≤1.0%, P≤0.02%, S≤0.01%, Ti: 0.01~0.1%, Cr: 0.05~1.0%, Al≤0.06% and N≤0.006 %, the balance is iron and unavoidable impurities. This product uses low C-Si-Mn as the basis and adds one or more components of Cr, Mo, Ni, Cu, B, Nb and other alloys. It is more complicated, has higher requirements for the process, adds more types of precious metals, and has a higher cost. This design uses precious metal elements to fix carbon, which has high costs and strict requirements on carbon content.

[0006] The Chinese patent with publication number: CN101775536A discloses: a kind of 225MPa class anti-seismic low yield strength steel and its manufacturing method. The invention adopts low C, low Si- The composition of Mn is designed, and one or more of Ti, Nb or V is selected to be added. This design uses precious metal elements to fix carbon, which has high cost and strict requirements on carbon content.

[0007] The Chinese patent with publication number: CN101781736 discloses a kind of steel with a yield strength of 225MPa for earthquake-resistant construction and its production method. The invention uses low C, low Si-Mn Composition design, adding Re, Mg and other metal elements, the alloy smelting added by this design is difficult, the process is difficult to control, and the follow-up heat treatment takes a long time, which increases the production cycle and cost

Images