Low-temperature low-yield steel and manufacturing method thereof

A production method and low-yield 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: 2014-12-24
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 promoti

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  • Low-temperature low-yield steel and manufacturing method thereof
  • Low-temperature low-yield steel and manufacturing method thereof
  • Low-temperature low-yield steel and manufacturing method thereof

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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 manufacturing method thereof, wherein the steel is prepared by the following chemical components according to the weight percentage: 0.01-0.04% C, 0.14-0.3% Si, 0.3-0.5% Mn, no more than 0.013% P, no more than 0.005% S, and 0.01-0.035% Nb, and the steel is designed by adopting ultra-low carbon and micro niobium alloy to ensure its low-temperature impact toughness under a low-yield condition. The manufacturing method of the hot-rolling low-temperature low-yield steel is characterized by adopting ultra-low carbon and niobium alloy, and combining a reasonable controlled rolling and cooling process to manufacture the low-temperature low-yield anti-seismic steel, wherein the hot rolling mechanical property can reach requirements, the yield strength is less than 225MPa, the elongation reaches 40%, and the impact energy is no less than 250 J at -40 degrees centigrade. The method can successfully solve the technical difficulty that the low-temperature low-yield steel is easy to mix crystals, narrow in rolling temperature windows and low roll 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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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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