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600-MPa grade vanadium-containing high-strength hot-rolled steel bar and production method thereof

A production method and technology for steel bars, applied in the field of metallurgical steelmaking and processing, can solve the problems of large energy consumption, rising connection costs, large alloy consumption, etc., and achieve the effects of reducing costs, reducing the density of reinforcement, and saving resources.

Active Publication Date: 2012-03-21
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, PSB785 steel bars are usually used for steel bars above 590MPa, resulting in large alloy consumption, high cost, complicated process, and large energy consumption. At the same time, due to the high carbon equivalent, only mechanical connections can be used instead of welding, resulting in increased connection costs.

Method used

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  • 600-MPa grade vanadium-containing high-strength hot-rolled steel bar and production method thereof
  • 600-MPa grade vanadium-containing high-strength hot-rolled steel bar and production method thereof

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Experimental program
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Effect test

Embodiment 1

[0021] The mass percentage of each component in steel is: 0.23%C, 0.42%Si, 1.42%Mn, 0.091%V, 0.0137%N, 0.021%S, 0.030%P, and the rest is Fe and inevitable impurities. 100-ton converter vanadium extraction, 100-ton converter and LF refining process for vanadium slag alloying and vanadium nitride alloy addition, nitrogen blowing throughout, billet continuous casting, soaking, high-pressure water phosphorus removal, bar unit rolling (rolling temperature 990 ℃, finish rolling temperature 910℃), light water penetration, natural cooling in cooling bed, shearing.

[0022] The mechanical properties, formability and microstructure of the obtained steel bars are shown in Table 1.

[0023]

[0024]

Embodiment 2

[0026]The mass percentage of each component in the steel is: 0.22%C, 0.47%Si, 1.40%Mn, 0.103%V, 0.0159%N, 0.027%S, 0.032%P, and the rest is Fe and inevitable impurities. 100-ton converter vanadium extraction, 100-ton converter and LF refining process for vanadium slag alloying and adding ferrovanadium nitride and manganese nitride alloy, nitrogen blowing throughout, billet continuous casting, soaking, high-pressure water phosphorus removal, bar rolling (starting rolling temperature 1020°C, finish rolling temperature 950°C), light water penetration, natural cooling in cooling bed, shearing.

[0027] The mechanical properties, formability and microstructure of the obtained steel bars are shown in Table 2.

[0028]

[0029]

Embodiment 3

[0031] The mass percentage of each component in steel is: 0.24%C, 0.53%Si, 1.47%Mn, 0.112%V, 0.0174%N, 0.025%S, 0.023%P, and the rest is Fe and inevitable impurities. 100-ton converter vanadium extraction, 100-ton converter and LF refining process for vanadium slag alloying and adding ferrovanadium, ferrovanadium and manganese nitride alloy, nitrogen blowing in the whole process, billet continuous casting, soaking, high-pressure water phosphorus removal, Bar rolling (starting rolling temperature 1060°C, finishing rolling temperature 970°C), light water penetration, natural cooling in cooling bed, shearing.

[0032] The mechanical properties, formability and microstructure of the obtained steel bars are shown in Table 3.

[0033] .

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Abstract

The invention relates to a 600-MPa grade vanadium-containing high-strength hot-rolled steel bar and a production method thereof, and belongs to the technical field of metallurgical steel-making and processing; the technical scheme is that the steel bar is prepared by the following components by mass: 0.21-0.25% of C, 0.35-0.60% of Si, 1.35-1.55% of Mn, 0.08-0.12% of V, 0.005-0.04% of N, not more than 0.040% of S, not more than 0.040% of P, and the balance of Fe and inevitable impurities; by adopting vanadium-increasing, nitrogen-increasing, and nitrogen-fixing processes during the smelting process, and by decreasing the initial rolling temperature and the finish rolling temperature during the rolling process, fine-grain, solid-solution and precipitation strengthening are realized at a lowtemperature and a high pressure, so the strength is increased; the hot-rolled steel bar contains a dual-phase structure of ferrite and pearlite, wherein the pearlite accounts for 25-50%; good cooperation of strength and toughness can be reached by controlling ratios, forms and sizes of the phases.

Description

technical field [0001] The invention relates to a 600MPa grade vanadium-containing high-strength hot-rolled steel bar and a production method thereof, in particular to a vanadium-containing high-strength hot-rolled steel bar with a yield strength above 600MPa and a production method thereof, belonging to the technical field of metallurgical steelmaking and processing. Background technique [0002] In 2010, my country produced about 800 million tons of steel products, including about 130 million tons of steel bars, which played an important role in the development of the national economy. Hot-rolled steel bars are the main reinforcement materials for reinforced concrete building structures. With the emergence of multi-functional building structures such as high-rise, long-span, earthquake-resistant, low-temperature resistant, and fire-resistant, steel bars are required to have higher strength, toughness, and better weldability. and other comprehensive performance. Now some h...

Claims

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Application Information

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IPC IPC(8): C22C38/12C22C33/04C21D8/08
Inventor 田鹏白瑞国张兴利国富兴韩春良高海张俊粉
Owner HEBEI IRON AND STEEL
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