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Hot-rolling H-shaped steel containing and vanadium boride and having excellent low-temperature impacttoughness and preparation method of hot-rolling H-shaped steel

A low-temperature impact toughness, H-shaped steel technology, applied in metal rolling, metal rolling, rolling mill control devices, etc., can solve the problems of large fluctuations in impact absorption energy, low operability of steel properties, and low pass rate

Inactive Publication Date: 2014-05-28
山西新泰钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual industrial production process of Q345 H-shaped steel, after niobium, vanadium, titanium single or combined microalloying and controlled rolling and controlled cooling process, the impact absorbed energy fluctuates greatly at -40 ℃ and the pass rate is not high
Due to the complex shape of H-shaped steel, the forming process is basically determined, and it is not easy to change the deformation of each pass. Therefore, controlled rolling temperature and controlled cooling after rolling are often used. Considering the limitation of rolling mill load and the complexity of controlled cooling, controlled rolling and controlled cooling The operability of the process to improve the performance of steel is low

Method used

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  • Hot-rolling H-shaped steel containing and vanadium boride and having excellent low-temperature impacttoughness and preparation method of hot-rolling H-shaped steel
  • Hot-rolling H-shaped steel containing and vanadium boride and having excellent low-temperature impacttoughness and preparation method of hot-rolling H-shaped steel

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Experimental program
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Effect test

Embodiment 1

[0022] Example 1: Boron-vanadium-added Q345 H-shaped steel, product specification 700×300×13×24, the mass fraction of the steel is as follows (%): C 0.16~0.18, Si 0.26~0.29, Mn 1.20~1.27, P 0.012~0.018, S 0.007~0.010, Ca 0.005~0.008, B 0.0012~0.0023, V 0~0.076, the balance is Fe and trace impurities.

[0023] During the smelting process, control the mass percentage of gas in the profile billet: [N]≤80 ppm, [O]≤100 ppm. According to the above-mentioned smelting composition of Q345, the rolling process temperature is controlled as follows: heating temperature 1250~1280 ℃, billet opening temperature 1180~1225 ℃, final rolling temperature 790~830 ℃. During the universal rolling process, the billet stays for 35 seconds, and the cumulative reduction ratio is 60%.

[0024] The impact test adopts the Charpy V-shaped impact specimen, and the length direction is along the longitudinal direction of the flange of the H-shaped steel product.

[0025] See the experimental results figure ...

Embodiment 2

[0028] Example 2: boron-vanadium-added Q345 H-shaped steel, product specification 350×350×12×19, the mass fraction of steel is as follows (%): C 0.14~0.17, Si 0.25~0.30, Mn 1.31~1.39, P 0.01~0.018, S 0.005~0.010, Ca 0.005~0.008, B 0.0013~0.0022, V 0.035~0.05, the balance is Fe and trace impurities.

[0029] During the smelting process, control the mass percentage of gas in the profile billet: [N]≤80 ppm, [O]≤100 ppm. According to the above-mentioned smelting composition of Q345, the rolling process temperature is controlled as follows: heating temperature 1250~1280 ℃, billet opening temperature 1180~1230 ℃, final rolling temperature 760~810 ℃. During the universal rolling process, the billet stays for 15-50 seconds, and the cumulative reduction ratio is more than 55%. The impact test adopts the Charpy V-shaped impact specimen, and the length direction is along the longitudinal direction of the flange of the H-shaped steel product.

[0030] The experimental results are sho...

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Abstract

The invention relates to hot-rolling H-shaped steel containing and vanadium boride and having excellent low-temperature impacttoughness and a preparation method of the hot-rolling H-shaped steel. The H-shaped steel comprises the following chemical components in percentage by weight(%): 0.10-0.20 percent of C, 0.20-0.35 percent of Si, 1.10-1.45 percent of Mn, not more than 0.020 percent of P, not more than 0.010 percent of S, not more than 0.010 percent of Ca, 0.0005-0.0040 percent of B, 0.02-0.08 percent of V and the balance of Fe and trace amount of impurities. In the smelting process, the mass percentage of gas in a beamblank is that [N] is controlled to be not more than 80ppm and [O] is controlled to be not more than 100ppm. In the rolling process, the heating temperature of the beam blank is 1,190-1,290DEG C, the cogging temperature is 1,120-1,230DEG C and the finish rolling temperature is not more than 850DEG C. In the universal rolling process, the stay time is 15-50s and the accumulative compression ratio is 55 percent or greater. According to the hot-rolling H-shaped steel disclosed by the invention, the low-temperature impacttoughness of Q345 H-shaped steel products can be greatly improved and the low-temperature impacttoughness is better stabilized, so that the quality of the products is ensured and the products are suitable for harsh environments more easily.

Description

technical field [0001] The invention relates to an H-shaped steel used as a building component of a strip steel structure in a cold region, in particular to a hot-rolled H-shaped steel containing boron and vanadium with excellent low-temperature impact toughness and a preparation method thereof. Background technique [0002] H-shaped steel is optimized and developed from I-shaped steel. It is an economical section of construction steel. Because its section shape is similar to the English letter "H", it is called "H-shaped steel". There are two types of H-beams: hot-rolled and welded. Hot-rolled H-shaped steel has the characteristics of economical and reasonable cross-section, superior performance, simple, convenient and fast processing, manufacturing and construction and installation processes. It is called a green environmental protection product by the construction industry and environmentalists, and has become an important material component in the building steel structur...

Claims

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Application Information

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IPC IPC(8): C22C38/12C22C33/04B21B37/00
Inventor 徐梅刘琼孙吉王晋李建中郭连生
Owner 山西新泰钢铁有限公司
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