Ultrahigh-malleability tunnel supporting anchor rod steel of converter continuous cast billet and production method

Abstract

The invention relates to ultrahigh-malleability tunnel supporting anchor pile steel of converter continuous cast billet and a production method, which belongs to the technical field of a mine anchor rod. The anchor rod steel comprises the following components by weight percent: 0.5 to 0.70 percent of carbon, 0.15 to 1.20 percent of silicon, 0.5 to 2.5 percent of manganese, less than or equal to 0.045 percent of phosphorus, less than or equal to 0.045 percent of sulfur, 0 to 1.00 percent of chrome, 0 to 1.00 percent of nickel, 0 to 1.00 percent of molybdenum, 0 to 0.30 percent of copper, 0.03 to 0.40 percent of vanadium, 0.01 to 0.2 percent of aluminum, 0 to 0.10 percent of titanium, 0 to 0.10 percent of boron, 0.001 to 0.0 percent of niobium, 0.004 to 0.020 percent of nitrogen, and iron for the surplus; the yield strength Rel is larger than or equal to 600 MPa, the percentage elongation delta 5 is larger than or equal to 20 percent, the impact strength is 20 DEG C, Akv is larger than or equal to 27 J, and the breaking load is larger than or equal to 300 KN. By adopting the production process flow of converter crude metallurgy, LF furnace fine metallurgy and full protection continuous casting, the steel grade has the advantages that the purity is high, the structure is dense, the grain is fine, the physical chemistry properties of the steel are stable, the over-all mechanical property is good, the production operation and process flow are simple, and the rolled metal finished product can be directly used without heat treatment to the rear part.

Description

technical field [0001] The invention belongs to the technical field of mine bolts, in particular to a method for producing ultra-high-strength toughness roadway support bolt steel by continuous casting of billets in a converter, which is suitable for the support of mine roadways. Background technique [0002] With the rapid development of the national coal industry and the continuous expansion of mining scale, coal safety production has become one of the outstanding problems restricting the development of coal mines in our country. The geological mining conditions of my country's coal resource reserves are relatively poor, with deep burial and poor stability of coal seams. One-third of the geological structure is complex or extremely complex, and most coal mining operations are carried out in deep strata. Compared with the coal-producing countries in the world, not only the structure of the coal-measure strata is complex, but also the disaster factors such as gas, water, fir...

AI Technical Summary

Problems solved by technology

[0005] At present, there is no unified national standard for mine anchoring steel in China, and the steel used for anchoring and support in coal mines is chaotic, and ordinary steel grades with low strength grades and poor safety are usually used

Due to the backward manufacturing process of traditional steel grades, the chemical composition range requirements of general steel grades cannot meet the actual performance index requirements for the manufacture of ultra-high-strength and ductile large-scale anchor steel for mining

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