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Online high manganese steel toughening heat treatment method

A heat treatment method and technology for high manganese steel, applied in heat treatment equipment, heat treatment process control, manufacturing tools and other directions, can solve the problems of increasing the production difficulty and production cost of high manganese steel, difficult transportation and hoisting, waste of water resources, etc. Production line, simplified production process, energy saving effect

Active Publication Date: 2013-08-28
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For some thin-gauge products, if it cannot be coiled after final rolling, the roller table that needs to transport the steel plate is very long, or it needs to be cut immediately, which is unrealistic for many production lines and increases the production difficulty of high manganese steel. and production costs; even if it can be produced in the form of a flat plate, because it is very brittle, it is easy to break, and transportation and hoisting have become difficult; and the subsequent heat treatment needs to be heated to about 1050°C for heat preservation and water quenching, which is a waste of time. A lot of energy and a lot of water wasted

Method used

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  • Online high manganese steel toughening heat treatment method
  • Online high manganese steel toughening heat treatment method
  • Online high manganese steel toughening heat treatment method

Examples

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Embodiment 1

[0018] In this example, it is intended to perform online heat treatment on a high manganese steel plate with a thickness of 3 mm, a width of 1000 mm, and a weight of 15 tons after coiling. The high manganese steel consists of the following chemical components by weight: 1.1% carbon, 13% manganese, 0.3% silicon, no more than 0.03% phosphorus, no more than 0.005% sulfur, and the rest are iron and inevitable impurity elements.

[0019] The processing process is as follows:

[0020] It is measured that the temperature of the high manganese steel that leaves the finish rolling hole in the last pass is 955°C (finish rolling temperature), and the temperature when the steel plate begins to reach the water quenching device is 953°C (that is, the temperature at which heat treatment cooling starts), and the water quenching device senses the temperature of the steel plate When it arrives, spray water immediately for cooling. The time for the steel plate to pass through the entire water qu...

Embodiment 2

[0023] In this example, it is intended to perform online heat treatment on a high manganese steel plate with a thickness of 2 mm, a width of 1000 mm, and a weight of 10 tons after coiling. The high manganese steel consists of the following chemical components by weight: 1.1% carbon, 13% manganese, 0.3% silicon, no more than 0.03% phosphorus, no more than 0.005% sulfur, and the rest are iron and inevitable impurity elements.

[0024] The processing process is as follows:

[0025] It is measured that the temperature of the high manganese steel that exits the finish rolling hole in the last pass is 953°C (final rolling temperature), and the temperature when the steel plate reaches the water quenching device is 951°C (heat treatment start temperature). The water quenching device senses the arrival of the steel plate, Immediately carry out water spray cooling, the time for the steel plate to pass through the entire water quenching device is 15 seconds (cooling time), the temperatur...

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Abstract

The invention discloses an online high manganese steel toughening heat treatment method and belongs to the field of online steel heat treatment. According to the method, hot-rolled steel is directly cooled to room temperature on line, wherein the finishing rolling temperature of the steel is over 950 DEG C, the difference between the initial online cooling temperature and the finishing rolling temperature of the steel is 0-10 DEG C, and the cooling speed is 50-70 DEG C per second. According to the process, a product can achieve the required excellent performance, and a large amount of energy and a large quantity of water resources can be saved; and meanwhile, the production process is greatly simplified, the production efficiency is improved, and the production cost is reduced.

Description

technical field [0001] The invention relates to the field of online heat treatment of steel materials, in particular to an online water toughening heat treatment method for high manganese steel. Background technique [0002] High manganese steel is a special wear-resistant steel with a carbon content of 1.0% to 1.3% and a manganese content of 12% to 14%. High manganese steels have the potential for work hardening only after heat treatment to maintain a single austenitic phase. Different from ordinary carbon steel, high manganese steel does not harden but becomes soft after quenching in water. Therefore, the heat treatment of high manganese steel is also called water toughening heat treatment. Water toughening heat treatment is to completely austenitize the steel plate and uniform the composition After rapid water cooling, the carbon element is completely dissolved in the austenite. At the same time, due to the austenite stabilization effect of the carbon element, the austen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02C21D11/00
Inventor 朱京军欧阳峥容邹仲平董洪壮许荣昌刘成宝许宝玉
Owner LAIWU IRON & STEEL GRP
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