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An annealing process of steel for high-strength mine chains

An annealing process, high-strength technology, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of high production cost, long production cycle, energy consumption, etc., to reduce energy consumption, maintain stability, and reduce production costs Effect

Active Publication Date: 2022-03-22
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing annealing process has slow roll speed, long production cycle, energy consumption and high production cost

Method used

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  • An annealing process of steel for high-strength mine chains

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: The content of each component in the steel is: C 0.23wt.%, Si 0.12wt.%, Mn 1.20wt.%, S0.002wt.%, P 0.011wt.%, Ni 1.04wt.%, Cr 0.53 wt.%, Mo 0.54wt.%, Cu 0.05wt.%, Al 0.027wt.%, N 0.004wt.%, the balance is Fe and impurities. The following steps are used for processing: (1) The starting rolling temperature before annealing is 980°C, the finishing rolling temperature is 890°C, and the hardness of the hot-rolled state is 250-260HBW; (2) The roller hearth type continuous annealing furnace is adopted, and the furnace section is divided into 13 zones, with a total length of 65m. Zone 1-2 is 6m in length, Zone 3-6 is 4m in length, Zone 7 is 7m in length, Zone 8 is 4m in length, Zone 9-10 is 5.5m in length, and Zone 11-13 is 5m in length. The speed is 7.5m / h; (3) The temperature of zone 1-2 of annealing furnace is set to 680°C, the temperature of zone 3-9 is set to 710°C, the temperature of zone 10-11 is set to 650°C, and the temperature of zone 12 is set 630 ℃, 13 z...

Embodiment 2

[0013] Example 2: The content of each component in the steel is: C 0.22wt.%, Si 0.14wt.%, Mn 1.18wt.%, S0.003wt.%, P 0.010wt.%, Ni 1.00wt.%, Cr 0.52 wt.%, Mo 0.52wt.%, Cu 0.05wt.%, Al 0.027wt.%, N 0.005wt.%, the balance is Fe and impurities. The following steps are used for processing: (1) The starting rolling temperature before annealing is 1000°C, the finishing rolling temperature is 890°C, and the hardness of the hot rolling state is 245-260HBW; (2) The roller hearth type continuous annealing furnace is adopted, and the furnace section is divided into 13 zones, with a total length of 65m. Zone 1-2 is 6m in length, Zone 3-6 is 4m in length, Zone 7 is 7m in length, Zone 8 is 4m in length, Zone 9-10 is 5.5m in length, and Zone 11-13 is 5m in length. The speed is 7.5m / h; (3) The temperature of zone 1-2 of annealing furnace is set to 680°C, the temperature of zone 3-9 is set to 710°C, the temperature of zone 10-11 is set to 650°C, and the temperature of zone 12 is set 630 ℃, 13...

Embodiment 3

[0014] Example 3: The content of each component in the steel is: C 0.21wt.%, Si 0.25wt.%, Mn 0.92wt.%, S0.010wt.%, P 0.013wt.%, Ni 1.04wt.%, Cr 0.40 wt.%, Mo 0.76wt.%, Cu 0.07wt.%, V 0.09wt.%, Al 0.020wt.%, N 0.010wt.%, the balance is Fe and impurities. The following steps are used for processing: (1) The starting rolling temperature before annealing is 980°C, the finishing rolling temperature is 880°C, and the hardness of the hot-rolled state is 265-280HBW; (2) The roller hearth type continuous annealing furnace is adopted, and the furnace section is divided into 13 zones, with a total length of 65m. The length of the 1-2 area is 6m, the length of the 3-6 area is 4m, the length of the 7 area is 7m, the length of the 8 area is 4m, the length of the 9-10 area is 5.5m, and the length of the 11-13 area is 5m. The speed is 7.5m / h; (3) The temperature of zone 1-2 of annealing furnace is set to 680°C, the temperature of zone 3-9 is set to 710°C, the temperature of zone 10-11 is set ...

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Abstract

The invention discloses an annealing process of steel for high-strength mining chains. Compared with the prior art, the annealing process shortens the annealing time by more than four hours and significantly shortens the production cycle through the configuration of a higher roller speed. . By optimizing the partition length and partition temperature of the annealing furnace section, reasonably allocating the distribution time of the high-temperature zone and the low-temperature zone, increasing the duration of the high-temperature zone, and maintaining the stability of the high-temperature annealing stage, the simultaneous production of different specifications of hot-rolled materials can be realized, which can meet the hardness requirement , organization and uniformity requirements, and can greatly reduce energy consumption, reduce production costs, and facilitate production organization.

Description

technical field [0001] The invention relates to an annealing process of steel, in particular to an annealing process of steel for high-strength mine chains. Background technique [0002] High-strength mining chain steel is used to make high-strength mining C-class round link chains. The chains produced are used in large-scale mining machinery and are widely used in large and extra-large coal mines at home and abroad. [0003] With the rapid development of science and technology and industrial economy, the high performance requirements for mining circular link chains are becoming increasingly stringent. At present, the hot-rolled materials of C-grade circular link chains commonly used have high hardness and uniformity cannot meet the requirements, and annealing is required to reduce the hardness. , Improve hardness and tissue uniformity. However, the existing annealing process has slow roll speed, long production cycle, energy consumption and high production cost. Moreover,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/26C21D6/00C21D8/00C21D9/56C21D11/00C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46
CPCC21D1/26C21D8/005C21D6/004C21D6/005C21D6/008C21D9/56C21D11/00C22C38/02C22C38/04C22C38/002C22C38/44C22C38/42C22C38/06C22C38/001C22C38/46
Inventor 王杨郑宏伟孙乐政田宾华赵张发王庆龙徐伟
Owner NANJING IRON & STEEL CO LTD