High strength chain steel for mine, and preparation method thereof

Abstract

The present invention discloses a high strength chain steel for mine, and a preparation method thereof. The high strength chain steel comprises, by weight, 0.21-0.25% of C, 0.15-0.35% of Si, 0.20-0.25% of Mn, less than or equal to 0.015% of P, less than or equal to 0.015% of S, 0.40-0.65% of Cr, 0.60-0.70% of Ni, 0.07-0.15% of Cu, 0.02-0.05% of Alt, less than or equal to 0.012% of N, and the balance of Fe. The preparation method comprises steps such as electric furnace or converter smelting, refining outside the furnace, steel billet continuous casting and heating rolling, wherein nitrogen content in the steel is less than or equal to 80 ppm and oxygen content in the steel is less than or equal to 30 ppm after refining outside the furnace, a steel billet soaking temperature is 1150-1250 DEG C, a rolling staring temperature is 1000-1180 DEG C, a rolling finishing temperature is 830-980 DEG C, and annealing is performed to obtain the high strength chain steel for mine. Internal and external qualities of the obtained steel of the present invention meet high strength ring chain processing requirements of customers, and market requirements are met.

Description

technical field [0001] The invention belongs to the field of metallurgy and relates to a high-strength steel, in particular to a high-strength mining chain steel and a preparation method thereof. Background technique [0002] As an important part of coal mine conveying machinery, mining circular link chain not only directly affects the production efficiency of conveying equipment, but also has a certain impact on safe production. Therefore, the requirements for the uniformity, cleanliness, and strength of the steel used to make the round link chain are extremely strict. [0003] At present, the composition of ordinary strength mining chain steel is: C: 0.17%-0.24%, Si: 0.17%-0.37%, Mn: 1.30%-1.60%, P: ≤0.030%, S: ≤0.030%, V: 0.07 %-0.12%. Ordinary-strength mining chains cannot meet the requirements for making high-strength mining chains due to the steel strength, surface quality, internal uniformity, and cleanliness of the steel during the smelting and rolling process, res...

AI Technical Summary

Problems solved by technology

Ordinary-strength mining chains cannot meet the requirements for making high-strength mining chains due to the steel strength, surface quality, internal uniformity, and cleanliness of the steel during the smelting and rolling process, resulting in cracking of the rolled material sampling forging, or welding into a round by the user. Breakage occurs when the chain is stretched after the chain test

With the development of coal mining machinery and the increase of mining intensity, ordinary mining chains can no longer meet the needs of the development of mining enterprises, and the demand for high-strength mining chains is increasing