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High-strength steel bar and production method thereof

A technology of high-strength steel bars and production methods, applied in heat treatment equipment, furnaces, manufacturing tools, etc., can solve the problems of increased steel consumption, resource and energy consumption, low strength, etc., to improve the ability to resist external disturbances and improve resistance to damage. , the effect of improving the ability to resist deformation

Active Publication Date: 2019-08-16
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +2
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0002] During the use of low-grade steel bars (including ordinary steel bars), it not only increases the consumption of steel, causes resource and energy consumption, and increases the environmental burden, but also because of the obvious yield platform and low strength, the yield stage does not increase the tensile force. Larger plastic deformation will occur, which will seriously affect the safety of buildings.

Method used

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  • High-strength steel bar and production method thereof
  • High-strength steel bar and production method thereof
  • High-strength steel bar and production method thereof

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Embodiment Construction

[0027] As described in the background technology, there are problems such as obvious yield platform and low strength in low-grade steel bars (including common steel bars and even some anti-seismic steel bars), which do not meet the increasing safety level requirements, and the inventor provides based on this A high-strength steel bar with no obvious yield platform and good comprehensive strength performance and a production method thereof, based on its excellent performance, the high-strength steel bar can also be called a large deformation-resistant steel bar.

[0028] Specifically, in one embodiment of the present invention, the chemical composition of the high-strength steel bars includes: C: 0.15-0.32%, Si+Mn: 0.5-1.9%, Mn+Cr+Mo+Ni: 1.1-2.1% by mass percentage %, V:0.02-0.8%, at least one of Nb, Ti and Al: 0.01-0.3%, the balance is Fe and unavoidable impurities; wherein, Mn=(2.5-3.5)Si, carbon equivalent Ceq= C+Mn / 6+(Cr+Mo+V) / 5+(Cu+Ni) / 15≤0.56%.

[0029] Based on a large ...

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Abstract

The invention discloses a high-strength steel bar and a production method thereof. The high-strength steel bar comprises the chemical components of 0.15-0.32% of C, 0.5-1.9% of Si+Mn, 1.1-2.1% of Mn+Cr+Mo+Ni, 0.02-0.8% of V, 0.01-0.3% of at least one of Nb, Ti and Al and the balance Fe and inevitable impurities; and Mn=(2.5-3.5)Si, Ceq=C+Mn / 6+(Cr+Mo+V) / 5+(Cu+Ni) / 15<=0.56%. The production method ofthe high-strength steel bar comprises the steps of smelting, continuous casting, temperature control rolling and temperature control cooling, wherein the superheat temperature of molten steel subjected to continuous casting is 15-30 DEG C, the heating temperature is 1200-1250 DEG C, in addition, the molten steel stays in a furnace for 60-120 min, the rolling start temperature is 1000-1150 DEG C,the finish rolling temperature is 850-950 DEG C, and the temperature of the steel when the steel is fed onto a cooling bed is 800-920 DEG C.

Description

technical field [0001] The invention belongs to the technical field of iron and steel materials, and relates to a high-strength steel bar and a production method thereof. Background technique [0002] During the use of low-grade steel bars (including ordinary steel bars), it not only increases the consumption of steel, causes resource and energy consumption, and increases the environmental burden, but also because of the obvious yield platform and low strength, the yield stage does not increase the tensile force. Larger plastic deformation will occur, which will seriously affect the safety of the building. However, the relevant requirements for structural safety levels such as major protection projects are constantly improving, so that low-grade steel bars can no longer fully meet the requirements, and high-strength steel bars (such as large deformation-resistant steel bars) have emerged as the times require. Contents of the invention [0003] The object of the present in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/48C22C38/46C22C38/50C22C38/06C22C38/54C21C7/072C21D8/08
CPCC22C38/02C22C38/04C22C38/44C22C38/48C22C38/46C22C38/50C22C38/06C22C38/54C21C7/072C21D8/08C21D8/065C21D2211/005C21D2211/009C21D2211/002B22D11/115C21D6/004C21D6/005C21D6/008C21D9/0075
Inventor 张宇麻晗周云陈焕德
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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