Blued packing tape with tensile strength of more than 1500MPa and production method of blued packing tape

Abstract

The invention discloses a blued packing tape with tensile strength of more than 1500MPa. The blued packing tape comprises the following components in percentage by weight: 0.03-0.25 percent of C, 0.05-0.20 percent of Si, 0.50-2.50 percent of Mn, 0.01-0.10 percent of P, 0-0.015 percent of S, 0.01-0.20 percent of Als, 0.05-0.20 percent of Ti and 0.004-0.010 percent of N. The process comprises the following steps: smelting, performing controlled rolling and controlled cooling, and bluing and annealing. After a proper amount of Ti is added, Ti and C are combined to form nano-scale TiC, TiN and TiCN, and the product serves as the second phase precipitate which is small and disperses in steel so as to achieve the important precipitation strengthening effect; and according to the Ti in the packing tape, the austenite grain size can be controlled under extremely high soaking temperature, grain control in a heat affected zone is facilitated, and the welding performance of the high-strength packing tape is improved. Although lead bath furnace annealing is adopted, the temperature is only 200 to 300 DEG C and is far lower than volatilization temperature of lead, so that lead volatilization is avoided, and the environmental pollution is avoided. The blued packing tape disclosed by the invention is low in cost, good in performance, simple and feasible in process and high in production efficiency, and ultrahigh-strength packing tapes with the tensile strength of larger than 1500MPa are produced.

Description

technical field [0001] The invention relates to a bluing strap and a production method, in particular to a bluing strap with a tensile strength ≥ 1500 MPa and a production method. Background technique [0002] Ultra-high-strength strapping is a thin strip-shaped steel product that ensures safe loading, unloading and transportation of goods. It is widely used in the packaging of steel, non-ferrous metals, light textile products, building materials, glass, tobacco, paper rolls, wool and other goods. Ultra-high-strength strapping generally requires the characteristics of "tensile strength not less than 1200 MPa, elongation not lower than 8%, and good corrosion resistance", so it has high strength, good ductility, firm binding and continuous strapping during loading and unloading. , It is not easy to loose packages during transportation and other advantages. In addition, due to the long-term work in the outdoor environment, the straps are required to have certain corrosion resi...

AI Technical Summary

Problems solved by technology

[0005] There are three ways to produce straps, namely: 1. The hot-rolled raw material is strengthened by cold rolling and then annealed. At present, it is mainly used to produce straps with a tensile strength of 800~900MPa and an elongation ≥ 4%. Simple, low production cost, but extremely high quality requirements for strapping raw materials; 2. Adopt bainite strengthening treatment process of isothermal quenching in lead bath furnace, mainly produce straps with tensile strength ≥ 980MPa and elongation ≥ 10%. However, due to the use of lead bath furnace, it is easy to cause environmental pollution and safety hazards, and at the same time, the cost is high; 3. The martensitic strengthening treatment process of two-phase zone quenching is adopted, and the main products are tensile strength ≥ 940MPa and elongation ≥ 8%. The strapping, the process has little pollution and high heat utilization efficiency, but due to some problems such as cost, equipment and technology, it is not perfect and mature enough.

Images