Method for producing HRB 600 high-strength hot-rolled ribbed steel bars through vanadium-chromium microalloying

A hot-rolled ribbed steel bar and micro-alloying technology, applied in the field of metallurgy, can solve the problems of high price and large proportion of production cost, and achieve the effects of low cost, low inclusion level and high purity of molten steel

Inactive Publication Date: 2020-08-25
青海西钢特殊钢科技开发有限公司 +1
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Problems solved by technology

[0003] Rebar is a kind of high-strength steel bar. Its production mainly uses Nb, V, Ti and other elements as micro-alloy strengthen

Method used

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  • Method for producing HRB 600 high-strength hot-rolled ribbed steel bars through vanadium-chromium microalloying
  • Method for producing HRB 600 high-strength hot-rolled ribbed steel bars through vanadium-chromium microalloying
  • Method for producing HRB 600 high-strength hot-rolled ribbed steel bars through vanadium-chromium microalloying

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Embodiment Construction

[0036] The following describes the present invention in detail with reference to the drawings and specific embodiments.

[0037] 1. Composition requirements

[0038] In order to make the yield strength of the produced HRB600 hot-rolled ribbed steel bars reach 630~680MPa, the tensile strength reach 760~890MPa, the elongation after fracture A reaches ≥15%, and the maximum elongation Agt reaches ≥10%. The indicators can all meet the requirements of GB / T1499.2-2018. The main measures we take are precipitation strengthening and fine-grain strengthening of Cr and V microalloying elements. In order to ensure the precipitation of precipitates, the content of V microalloys is adjusted to 0.140 % Or so, the nitrogen content in the steel must be within the range of 120ppm to 180ppm. The chemical composition of HRB600 hot-rolled ribbed steel bars and the specific requirements of the weight percentage of each component are shown in Table 1.

[0039] Table 1 The chemical composition of HRB600 hot...

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Abstract

The invention discloses a method for producing HRB 600 high-strength hot-rolled ribbed steel bars through vanadium-chromium microalloying. The method includes the following procedures of converter smelting; LF refining; continuous casting; heating; rolling; cooling bed air cooling; and shearing. In the converter smelting procedure, ferrosilicon, ferromanganese, a silicon-manganese alloy, ferrochromium and a silicon-nitrogen alloy are added when steel is tapped by 2/3 for silicon, manganese and chromium alloying; and in the LF refining procedure, the molten steel temperature of a refining furnace is higher than or equal to 1,570 DEG C, and ferrovanadium is added according to the component requirements for vanadium alloying. The method has the beneficial effects that (1), the blank in producing 600 MPa steel bars through V-Cr composite microalloying is filled in, V and Cr are used as microalloying strengthening elements, Nb and Ti with generally-high price are prevented from being used,and therefore the production cost is reduced; (2), 80% of V exists in a precipitation state after rolling, and the strength of the HRB 600 high-strength hot-rolled ribbed steel bars is remarkably improved; and (3), a certain amount of Cr is added into steel, the strength of the HRB 600 high-strength hot-rolled ribbed steel bars is obviously improved, and certain anti-corrosion capacity is achieved.

Description

Technical field [0001] The invention relates to a method for producing hot-rolled ribbed steel bars, in particular to a method for producing HRB600 high-strength hot-rolled ribbed steel bars by vanadium-chromium microalloying, and belongs to the technical field of metallurgy. Background technique [0002] On November 1, 2018, the new standard for hot-rolled ribbed steel bars (GB / T 1499.2-2018) was released and implemented, and the new standard added 600MPa steel bars. High-strength hot-rolled ribbed steel bars have the characteristics of high strength and excellent comprehensive performance. At present, the strength level of hot-rolled ribbed steel bars is mainly 400MPa, and a small amount is 500MPa. Many domestic manufacturers have developed 600MPa high-strength steel bars (ie HRB600 high-strength steel bars) through V-N microalloying. HRB600 high-strength steel bars have many advantages in construction engineering applications. Compared with the currently used 400MPa and 500MP...

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/24C22C38/38C22C33/06C21C5/28C21C7/06C21C7/072C21D8/08
CPCC21C5/28C21C7/06C21C7/072C21D8/065C21D8/08C22C33/06C22C38/001C22C38/02C22C38/04C22C38/24C22C38/38Y02P10/20
Inventor 谈彪高旭东武永孝赵海东李斌吴建林李虎业任红娃
Owner 青海西钢特殊钢科技开发有限公司
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