British standard B500B ribbed thread steel bar and production method thereof

Abstract

The invention discloses a British standard B500B ribbed thread steel bar and a production method thereof. The British standard B500B ribbed thread steel bar comprises, by mass, 0.18%-0.22% of C, 0.20%-0.50% of Si, 0.80%-1.20% of Mn, 0%-0.035% of P and S, 0.10%-0.12% of V, 0.018%-0.025% of N, 0%-0.15% of Cr, Mo, Ni and Cu, and the balance Fe and inevitable impurities, wherein the carbon equivalent Ceq is smaller than or equal to 0.50%. According to the British standard B500B ribbed thread steel bar, the precipitation temperature and the brittle transition temperature of carbonitride can be lowered by optimizing and adjusting the content of the C element, the Si element and the Mn element and adding microalloy elements V, so that tensile strength, toughness and yield strength of coiled reinforced bars are effectively improved, and thus the British standard B500B ribbed thread steel bar meeting the tensile strength and yield strength requirements is obtained. According to the method, low-manganese and high-vanadium alloying is adopted, the control-rolling temperature and the control-cooling technology are matched to be reasonably designed, and the British standard B500B ribbed thread steel bar which is qualified in low-cost production performance and excellent in weldability is obtained. Economical benefits and social benefits are achieved.

Description

technical field [0001] The invention relates to a threaded steel bar and a production method thereof, in particular to a British standard B500B ribbed threaded steel bar and a production method thereof. Background technique [0002] 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. Increasing the yield strength of threaded steel can reduce the diameter of the steel bar, save the amount of steel used, and reduce the project cost. At the same time, it can also reduce the self-weight of the steel structure and shorten the project cycle. At present, most of the foreign countries use steel bars of 400MPa and above. The British standard B500B is one of ...

AI Technical Summary

Problems solved by technology

The above rebar has the following disadvantages: the addition of chromium content increases the carbon equivalent of the steel, which leads to the deterioration of the weldability of the steel bar, and the weldability becomes poor.

Due to the difference in the production process of coiled snails and straight snails, direct use of the above-mentioned rebar will lead to a series of problems such as the yield point of coiled snails is not obvious, and the deviation of yield strength index is large.

Images