A production method of cold-resistant thin strapping with tensile strength ≥ 1200mpa

Abstract

The invention discloses a production method for a cold-resisting thin bundle belt with the tensile strength larger than or equal to 1,200 MPa. The method comprises the steps that a 09MnNiDR hot-rolled acid-pickling roll is adopted as a raw material to conduct cold rolling; high-temperature austenitizing is conducted after uncoiling, splitting and deburring; first-time quenching is conducted through an NaNO3+Na2SiO3 water solution; second-time quenching is conducted through an NaOH+C12H25SO4Na water solution; tempering is conducted after washing; and air cooling is conducted to the room temperature, and coiling is conducted. The thickness of a product ranges from 0.70 mm to 1.10 mm, the tensile strength of the product is not lower than 1,200 MPa, the ductility A of the product is not lower than 10%, the number of repeated bending times is not smaller than 10 (R=5mm), and the layering brittle failure phenomenon is avoided. The ballistic work is not lower than 100 J at the temperature of -40 DEG C, after the temperature is kept for 2,400 h, the ballistic work change fluctuation rate is in the range of 1%, and the cold resisting performance is good. The product performance can completely meet the requirement for bundling and packaging heavy objects in frigid zone areas.

Description

technical field [0001] The invention relates to a production method of a strap, in particular to a production method of a cold-resistant strap with a tensile strength ≥ 1200 MPa. Background technique [0002] Ultra-high-strength cold-resistant strapping is a high-value-added cold-rolled deep-processed product, which is widely used in the bundling and packaging of heavy-weight items in cold regions. It should generally have excellent mechanical properties and cold-resistant properties. [0003] Northeast my country and Tibet belong to severe cold areas. When storing or transporting heavy items in these areas, the corresponding straps must not only have high strength, but also have excellent cold resistance to prevent them from being exposed to cold for a long time. The brittleness increases due to lower service, resulting in broken belts and safety accidents. [0004] Existing common blued straps or painted straps are mainly used for bundling and packaging articles in convent...

AI Technical Summary

Problems solved by technology

This method is relatively simple, but it also has the following disadvantages: First, the process flow is relatively long, and it often needs to be assisted by additional coating, electroplating, hot-dip, and spraying equipment, and the production cost is high.

The second is that due to the inconsistency of the physical and chemical properties between the coating or the coating and the substrate, after a long period of high-intensity impact wear, the bonding force becomes poor, and aging, cracking, and falling off are prone to occur, which seriously affects the use of strapping life

The third is that the thickness of the coating or coating is often relatively large, generally reaching 50-100 µm. After the strapping enters the automatic baler, the phenomenon of tape jamming often occurs, which greatly reduces production efficiency.

However, there are shortcomings in this process: the cooling ability of molten nitrate is weak, it takes a long time to cool to the required temperature and the corresponding microstructure transformation occurs, and it is easy to make the steel with less stable austenite in the cooling process pearlite

In addition, due to the long cooling time, production often needs to be carried out at a slow speed, which will lead to low work efficiency and increased production costs

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