A kind of low-temperature low-yield steel and its production method

A low-yield, low-temperature technology, applied in the field of steelmaking, can solve the problems of small rolling force, prone to mixed crystals, narrow rolling temperature window, etc., and achieve the effect of low cost, meeting material requirements, and good material requirements.

Active Publication Date: 2016-08-24
NANJING IRON & STEEL CO LTD
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Problems solved by technology

Therefore, combining compositional design and process control to produce economical hot-rolled low-yield steel provides a basis for the application and promotion of seismic materials. However, this method is prone to mixed crystals, narrow rolling temperature window, and low-yield steel. Issues such as low restraint

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  • A kind of low-temperature low-yield steel and its production method
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  • A kind of low-temperature low-yield steel and its production method

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Embodiment Construction

[0022] The production method of a low-temperature low-yield steel provided in this embodiment includes a smelting process, a continuous casting process, a rolling process, and a heat treatment process. Harmful gas N, H content, using LF refining for deoxidation, desulfurization, alloying, and finally slab continuous casting, the chemical composition of the cast slab meets: C: 0.01-0.04%, Si: 0.14-0.3%, Mn: 0.3-0.5%, P≤0.013%, S≤0.005%, Nb: 0.01-0.035%, and the balance is iron and unavoidable impurity elements.

[0023] (1) According to the production process of the present invention, considering the low strength requirements, the composition design adopts the addition of a small amount of Nb alloy elements in the near-pure iron composition to prevent the high temperature state from heating the original crystal so as to ensure its low temperature impact toughness under low yield conditions . The actual chemical composition of the steel grade of the present invention is as show...

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Abstract

The invention relates to a low-temperature low-yield steel and a production method thereof, the chemical composition of which is calculated by weight percentage, including: C: 0.01-0.04, Si: 0.14-0.3, Mn: 0.3-0.5, P≤0.013, S≤0.005, Nb: 0.01‑0.035, designed with ultra-low carbon and micro-niobium alloying components to ensure low-temperature impact toughness under low-yield conditions. The production method of the hot-rolled low-temperature and low-yield steel provided is through the composition design of ultra-low carbon and niobium alloying, combined with a reasonable controlled rolling and controlled cooling process to produce low-temperature, low-yield anti-seismic steel with a thickness of 70mm, and hot-rolled The dynamic mechanical properties meet the requirements, the yield strength is less than 225MPa, the elongation reaches 40%, and the impact energy at ‑40°C is ≥250J. This method successfully solves the technical difficulties of low-temperature, low-yield steel prone to mixed crystals, narrow rolling temperature window, and low rolling force.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a low-temperature low-yield anti-seismic steel and a production process. Background technique [0002] Earthquakes have brought huge disasters to human beings. With the development of building anti-seismic technology and the in-depth analysis of anti-seismic mechanism, energy consumption anti-seismic technology has become a development trend of anti-seismic technology. Energy-consuming anti-seismic technology absorbs earthquake energy through energy dissipation dampers. During an earthquake, these anti-seismic devices bear the seismic load before other structural parts, and yield first, and absorb the seismic energy by repeated loads to protect the safety of the main structure and buildings. Since the 1990s, the research and development of low-yield-point steel as the main component in energy-dissipative aseismic design has attracted widespread attention. [0003] The patent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C22C33/04C21D8/00
Inventor 郑建平侯中华牛继龙苑阳阳李堂靳星夏成胜
Owner NANJING IRON & STEEL CO LTD
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