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Steel for circular ring chains for mineral purpose
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A technology of mining circular ring chain and chemical composition, applied in the field of manganese-containing alloy steel, can solve the problems of reducing the production efficiency of the circular ring chain, high steel production cost and high content of alloy elements, and achieves the advantages of cutting and cutting, Uniform organization, cost-effective effect
Active Publication Date: 2008-09-24
SHIJIAZHUANG IRON & STEEL
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[0003] The technical problem to be solved by the present invention is to provide a kind of steel for mining circular link chain, which has high hardenability and good flash butt welding performance, and the production process is simplified, so that the production cost is significantly reduced, and it overcomes the The existing steels 25MnV and 23SiMnV for C-level round link chains have insufficient hardenability in the production process of large-scale C-level round link chains, and it is difficult to meet the mechanical properties specified in the standard. The high Si content of 25SiMnMoV steel affects the flash butt welding of steel Performance, 23MnNiCrMo54 steel Due to the high content of expensive alloy elements and complex production process, the production cost of the steel is very high, and the quality of the steel in production is difficult to be stably controlled, so that the quality cannot reach the foreign level, which reduces the production efficiency of the round link chain. shortcoming
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Embodiment 1
[0022] The mass percentages of the chemical composition of steel ingredients for mine round link chains are: C 0.17%, Mn 2.0%, Si 0.1%, Mo 0.5%, Cr 0.1%, V 0.11%, Nb 0.03%, Al 0.02%, S 0.03%, Cu 0.08%, and the rest is Fe; the ingredients are smelted in an electric furnace, LF refined, 150 billet continuous casting, and hot rolled into φ22mm high-strength mining circular chain steel for coal mining machinery and transportation machinery ; and then through shearing, hot knitting, sandblasting, flash butt welding, pre-stretching, tempering heat treatment, and secondary pre-stretching to obtain a finished 22×86 round link chain.
[0023] The bending performance of the circular link chain: under the conditions of quenching at 880°C and tempering at 420°C / 1.5 hours, the bending is qualified according to GB / T12718-91; tensile mechanical properties: breaking load 750KN, elongation at break 15%, test Elongation 1.4%; Fatigue performance: more than 30,000 times.
Embodiment 2
[0025] The mass percentages of the chemical composition of steel ingredients for mine round link chains are: C 0.17%, Mn 2.0%, Si 0.1%, Mo 0.5%, Cr 0.1%, V 0.15%, Al 0.02%, P 0.01%, S 0.03%, Cu 0.08%, and the rest are Fe; others are the same as in Example 1.
Embodiment 3
[0027] The mass percentages of the chemical composition of steel ingredients for mine round link chains are: C 0.17%, Mn 2.0%, Si 0.1%, Mo 0.5%, Cr 0.1%, Nb 0.15%, Al 0.02%, P 0.01%, S 0.03%, Cu 0.08%, and the rest are Fe; others are the same as in Example 1.
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Abstract
The invention is about the steel for the annulus chain of the ore. The weight percent of the chemical constituent is C 0.17-0.30%, Mn 1.2-2.0%, Si 0.1-0.8%, Mo 0.1-0.5%, Cr 0.1-0.8%, V and or Nb 0.03-0.15%, Al 0.02-0.05%, S<=0.03%, P<=0.03%, Cu<=0.2%, the residue is Fe. The process of the steel accepts electric steelmaking or pneumatic steelmaking + LF refining + small square billet casting + hot rolling. The steel has the good hardenability, so can be used to produce the annulus chain of 18mm diameter.
Description
technical field [0001] The technical solution of the invention relates to a manganese-containing alloy steel. technical background [0002] Mining high-strength round link chain is an important part of coal mining machinery and transportation machinery. It is a vulnerable part and consumes a lot. According to national standards, circular link chains are divided into three grades: B, C and D according to mechanical performance requirements. At present, C-grade circular link chains are widely used, and 25MnV and 23MnCrNiMo54 alloy steels are widely used for manufacturing. However, 25MnV is only suitable for the manufacture of small-sized (≤φ18mm) C-grade circular link chains (medium-frequency induction heating and quenching of high-strength circular link chains for 25MnV steel mines, metal heat treatment, 11, 2004; talk about high-strength C-grade circular link chains for mining Experience of manufacturing steel, Zhongzhou Coal, 5, 1997). Adopt 23SiMnV to carry out the manuf...
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