A heat treatment process for producing high-quality mold steel in a trolley furnace

A trolley furnace and mold steel technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of poor temperature control accuracy, low production efficiency, long holding time, etc., to ensure uniform hardness and uniform furnace temperature performance, and the effect of preventing deformation of the steel plate

Active Publication Date: 2016-06-08
NANJING IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Production of mold steel in continuous furnaces has low production efficiency and high cost, which seriously occupies the production capacity of the production plant, and the trolley furnace can solve this problem as an auxiliary heat treatment equipment
[0003] At present, the trolley furnace heats up in one stage, and there is no intermediate temperature buffer area during the temperature rise, resulting in a large deviation of the target temperature, causing the local temperature of the steel plate to be too high, and a long holding time is required to uniform the furnace temperature
There is no specific specification for the steel loading method of the trolley furnace, and insufficient attention has been paid to the production. The unscientific steel loading method is not conducive to the hot air circulation in the furnace, and it is difficult to control the uniformity of the furnace temperature.
After the heat preservation is over, the thermocouple and the reversing fan are directly turned off, and natural cooling is adopted, which cannot guarantee the uniformity of temperature drop in each area of ​​the furnace
The above problems lead to low heating efficiency of the trolley furnace, poor temperature control accuracy, uneven quality of finished products, and low pass rate, which seriously restrict the production of high-quality mold steel

Method used

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  • A heat treatment process for producing high-quality mold steel in a trolley furnace
  • A heat treatment process for producing high-quality mold steel in a trolley furnace
  • A heat treatment process for producing high-quality mold steel in a trolley furnace

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Embodiment 1

[0022] The process steps of a heat treatment process for producing high-quality mold steel in a trolley furnace provided in this embodiment:

[0023] (1) Steel loading: such as figure 1 Shown: the die steel plates 3 are stacked in order from thick to thin and from bottom to top into the bogie furnace, and the upper and lower plates are supported by the section steel 2. When the furnace is installed, the three sides of the steel plate are aligned on one side, 100mm away from the furnace wall, and the other side is filled with a thin plate in the width direction, 100mm away from the furnace wall. Each layer of steel plate 3 is placed 500mm away from the head and tail of the section steel 2 for support to prevent the two ends of the steel plate 3 from being affected by high temperature after tempering. The upper and lower section steel 2 spacers at the corresponding positions of the upper and lower steel plate layers are on the same vertical line to prevent the steel plate from bend...

Embodiment 2

[0032] The process steps of a heat treatment process for producing high-quality mold steel in a trolley furnace provided in this embodiment:

[0033] (1) Steel loading: such as figure 1 Shown: the die steel plates 3 are stacked in order from thick to thin and from bottom to top into the bogie furnace, and the upper and lower plates are supported by the section steel 2. When the furnace is installed, the three sides of the steel plate are aligned on one side, 120mm away from the furnace wall, and the other side is filled with a thin plate in the width direction, 120mm away from the furnace wall. Each layer of steel plate 3 is placed 500mm away from the head and tail of the section steel 2 for support to prevent the two ends of the steel plate 3 from being affected by high temperature after tempering. The upper and lower section steel 2 spacers at the corresponding positions of the upper and lower steel plate layers are on the same vertical line to prevent the steel plate from bend...

Embodiment 3

[0042] The process steps of a heat treatment process for producing high-quality mold steel in a trolley furnace provided in this embodiment:

[0043] (1) Steel loading: such as figure 1 Shown: the die steel plates 3 are stacked in order from thick to thin and from bottom to top into the bogie furnace, and the upper and lower plates are supported by the section steel 2. When the furnace is installed, the three sides of the steel plate are aligned on one side, 150mm away from the furnace wall, and the other side is made up with a thin plate in the width direction, 150mm away from the furnace wall. Each layer of steel plate 3 is placed 500mm away from the head and tail of the section steel 2 for support to prevent the two ends of the steel plate 3 from being affected by high temperature after tempering. The upper and lower section steel 2 spacers at the corresponding positions of the upper and lower steel plate layers are on the same vertical line to prevent the steel plate from ben...

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Abstract

The invention discloses a heat treatment process for producing high-quality mold steel in a trolley furnace, which is characterized in that it comprises the following process steps: (1) stacking the mold steels in sequence from thick to thin and loading them into the trolley furnace; Steel support; (2) Keep warm for 2 hours after heating up to 300℃~350℃ at a heating rate of 40℃ / h; (3) Continue heating up to 630℃~660℃ at a heating rate of 40℃ / h and then keep warm for 8~12h; (4 ) Under the premise of keeping the reversing fan working, cool it to 300°C with the furnace and then release it. (5) In the above process stage, when the temperature difference between the two sides of the steel plate is greater than 20°C, the reversing fan is reversing. The heat treatment process described in the invention effectively solves the problems of low heating efficiency and poor temperature control precision of the trolley furnace. This process produces high-quality mold steel plates with good shape and hardness that meets the standard requirements. The hardness difference between the same plate is less than 5HB, and the hardness difference between different plates is less than 10HB. Uniform hardness, good cutting performance, suitable for processing complex molds.

Description

Technical field [0001] The invention relates to a heat treatment process of die steel used in industry, and belongs to the technical field of metallurgical processing. Background technique [0002] Moulds are the main processing tools for manufacturing parts in machinery manufacturing, radio instruments, motors, electrical appliances and other industrial sectors. With the gradual development of the industry, various industries have higher and higher requirements for the accuracy of parts, which puts forward higher requirements on the processing and forming performance of die steel. Hardness uniformity is an important indicator of the cutting performance of mold steel, that is, mold steel is required to have good hardness uniformity. Due to the high alloy content of the die steel, the internal stress generated by rolling is large, and a long heat preservation time is required to uniform the structure during heat treatment. The production of mold steel in a continuous furnace has...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/52C21D9/46
Inventor 赵荣贵李东晖王从道
Owner NANJING IRON & STEEL CO LTD
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