Small-dimension British standard deformed steel bar B500B and manufacturing technology thereof

Abstract

The invention discloses a small-dimension British standard deformed steel bar B500B and a manufacturing technology thereof. The chemical component requirements of the small-dimension British standard deformed steel bar B500B are: C: 0.19-0.22 wt%, Si: 0.20-0.60 wt%, Mn: 0.70-0.90 wt%, Cr: 0.5-0.8%, P, S: less than or equal to 0.035 wt%, Ni, Cu: less than or equal to 0.25 wt%, Mo, Al: less than or equal to 0.10 wt%, and N: less than or equal to 0.011 wt%; the balance is Fe; carbon equivalent Ceq is less than or equal to 0.50%. The technology comprises converter or electric furnace smelting, LF refining or argon blowing refining, CCM bloom or billet continuous casting, bar controlled rolling, and controlled cooling. The component design takes chromium to replace expensive vanadium for alloying, is matched with reasonable-design controlled rolling temperature and air cooling temperature, realizes production of the small-dimension British standard deformed steel bar B500B with qualified performance in low cost, and acquires favorable economical and social benefits.

Description

technical field [0001] The invention belongs to the field of metallurgy, and relates to a British standard threaded steel and a production process thereof, specifically a small size (φ≤22mm) British standard threaded steel B500B and a production process thereof. technical background [0002] With the rapid development of large-scale high-rise buildings and long-span public buildings, high-strength hot-rolled ribbed steel bars with a characteristic yield strength of 500 MPa can significantly reduce the amount of steel bars and significantly improve the congestion of steel bars in beams, column joints, and frame columns in current frame structures. phenomenon, improve the quality of the project, and achieve better social and economic benefits, which are favored by the industry. B500B is one of the high-strength hot-rolled ribbed British standard rebar grades that implement the BS4449:2005 standard and have a characteristic yield strength of 500MPa. In order to ensure that the...

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Problems solved by technology

[0003] In order to overcome the defect of the high cost of the current B500B British standard rebar, the purpose of the present invention is to provide a small size (φ≤22mm) British standard rebar B500B and its production process. Under the control of the process, the composition design is achieved by taking chromium Substituting the expensive vanadium for alloying, combined with the reasonable design of controlled rolling temperature and air cooling temperature, the low-cost production of small-sized British standard thread B500B with qualified performance has been realized, and good economic and social benefits have been achieved.

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