Rust-resistant hot rolled ribbed bar and production process thereof

Abstract

The invention discloses a rust-resistant hot rolled ribbed bar and a production process thereof. The chemical components of the ribbed bar comprise C, Si, Mn, V, Cr, P and S, wherein the percentages by weight of the chemical components are as follows: 0.20-0.25% of C, 0.40-0.60% of Si, 0.90-1.10% of Mn, 0.010-0.020% of V, 0.15-0.25% of Cr, not larger than 0.042% of P, not larger than 0.040% of S and the balance of iron and unavoidable impurities. The production process mainly comprises the following steps: (1) preparation of blast furnace molten iron; (2) top-blown converter smelting; (3) LF furnace molten steel refining; (4) continuous casting; (5) rolling steel production; (6) cooling treatment. The rust-resistant hot rolled ribbed bar disclosed by the invention has the advantages that the chemical components of the ribbed bar are optimized, the addition amount of alloy elements is adjusted, the alloy cost is greatly reduced, the rolled cooling strength is reduced, the mechanical properties of the bar are guaranteed, damage of the strong water penetration cooling process on iron oxide coating on the surface of the ribbed bar after rolling is avoided as well, and the rust resistance of the ribbed bar is guaranteed.

Description

technical field [0001] The invention belongs to the field of metallurgy and metal material manufacturing, and in particular relates to an anti-corrosion hot-rolled ribbed steel bar and a production process thereof. Background technique [0002] Domestic hot-rolled ribbed steel bars for reinforced concrete (commonly known as hot-rolled threaded steel bars) have been using the production process of natural cooling after hot rolling. The ribbed steel bars produced by this process have better corrosion resistance, and different manufacturers in the same geographical area There was no significant difference in the corrosion of the products. The rolling process of increasing the strength of the steel bar through strong water cooling after rolling to reduce the cost of hot-rolled ribbed steel alloys has been widely adopted by many manufacturers. Using the strong water cooling process after rolling can make the hot-rolled thread The cost of steel alloy is reduced by 50-100 yuan / ton...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a kind of anti-corrosion hot-rolled ribbed steel bar and its production process, to solve the problem that the natural cooling process after hot rolling in the prior art completely relies on adding strengthening alloy elements to ensure the mechanical properties of the steel bar, resulting in high cost of the steel bar alloy, The problem of unreasonable temperature control of rolling, and the problem of serious corrosion rate and degree of corrosion of steel bars produced by this process in the atmosphere, although the hot-rolled steel bar is forced to pass through the water cooling process after rolling to reduce the alloy cost of the steel bar