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Production method of hot-rolled 500N Australian standard steel bar

A production method and steel bar technology, applied in the production field of hot-rolled 500N Australian standard steel bars, can solve problems affecting the safety of steel bars, affecting the appearance, and poor welding performance

Active Publication Date: 2013-08-14
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the steel bars produced by this method are easily corroded, which not only affects the appearance but also affects the safety of the steel bars in use (for example, poor welding performance)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0030] First, molten steel is initially smelted using a conventional converter or electric furnace steelmaking process. When the molten steel is tapped to a quarter, silicon-manganese, ferrosilicon, and vanadium-nitrogen alloys are sequentially added, and the addition is completed when the molten steel is tapped to three-quarters. Reach the requirement of 0.017-0.023%. Argon blowing strictly implements the argon blowing system of the ladle entering the station, and the total time of bottom blowing argon is ≥7min. The molten steel is then continuously cast into billets. Afterwards, the billet is sent into a heating furnace with a furnace temperature of 1120°C in the soaking section and heated for 70 minutes to make the billet start rolling temperature 1060°C. First, rough rolling is carried out for 6 passes at a rolling speed of 1.4m / s. , rolled for 50s in total; then rolled for 6 passes at a rolling speed of 4.5m / s, and rolled for 60s; finally, finished rolling for 2 passes ...

example 2

[0033] According to the same method as Example 1, a low-carbon equivalent high-strength hot-rolled steel bar with a specification of Φ12mm is manufactured, and the hot-rolled 500N Australian standard steel bar contains 0.18% by mass of C, 0.39% of Si, 1.10% of Mn, 0.105% % of V, 0.018% of P, 0.022% of S and 0.0175% of N and the amount of Fe and unavoidable impurities. The hot-rolled 500N Australian standard steel bar has a yield strength σs of 550Mpa, a tensile strength σb of 645-640MPa, and an elongation δ of 23.5%. 5 and 0.40% carbon equivalent Ceq.

example 3

[0035]According to the same method as Example 1, a low-carbon equivalent high-strength hot-rolled steel bar with a specification of Φ12mm is manufactured, and the hot-rolled 500N Australian standard steel bar contains 0.15% by mass of C, 0.55% of Si, 1.20% of Mn, 0.11 % of V, 0.018% of P, 0.022% of S and 0.0224% of N and the balance of Fe and unavoidable impurities. The hot-rolled 500N Australian standard steel bar has a yield strength σs of 555Mpa, a tensile strength σb of 665-650MPa, and an elongation δ of 25%. 5 and a carbon equivalent Ceq of 0.39%.

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Abstract

The invention discloses a production method of a hot-rolled 500N Australian standard steel bar, which comprises the following steps: smelting to obtain molten steel at first in an electric furnace or converter; alloying the molten steel in a steel ladle so that the nitrogen content in the molten steel reaches 0.017-0.023 percent; blowing argon to the bottom of the steel ladle or using an LF (low frequency) furnace to refine the molten steel; continuously casting the molten steel to obtain a steel blank; and rolling the steel blank to obtain the hot-rolled 500N Australian standard steel bar, the hot-rolled 500N Australian standard steel bar contains (by mass percentage) 0.15-0.22 percent of C, 0.20-0.60 percent of Si, 0.70-1.20 percent of Mn, less than 0.045 percent of P, less than 0.045 percent of S, 0.09-0.11 percent of V, 0.017-0.023 percent of N, Fe as the rest and inevitable impurities, the carbon equivalent of the hot-rolled 500N Australian standard steel bar is no more than 0.44percent, and the yield strength of the hot-rolled 500N Australian standard steel bar is no less than 500Mpa.

Description

technical field [0001] The invention relates to a production method of hot-rolled 500N Australian standard steel bars. Background technique [0002] With the continuous development of urban construction, the buildings of various countries in the world have been developing towards large scale. In order to improve the safety of large buildings, the construction industry has generally adopted hot-rolled ribbed steel bars with good weldability and high strength, such as steel bars of 500Mpa and above. [0003] For steel bars with a carbon equivalent less than 0.44% and a yield strength σs ≥ 500Mpa, the usual manufacturing methods include smelting, rolling and residual heat treatment after rolling. However, the steel bar produced by this method is easy to corrode, which not only affects the appearance but also affects the safety of the steel bar in use (for example, the welding performance is not good). Contents of the invention [0004] An object of the present invention is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C21D8/06
Inventor 刘艳林杜传治王淑华黄海玉牛冬梅孙道清梁辉江洪广杨王辉王建军徐尚富
Owner LAIWU IRON & STEEL GRP