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Heat treatment technology for high-chromium cast iron plate or hammer casting

A cast iron plate, heat treatment furnace technology, applied in heat treatment furnaces, heat treatment equipment, furnace types, etc., can solve the problems of fixed immobility, fixed blower speed, fixed cooling environment, etc.

Pending Publication Date: 2020-05-08
马清杰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the following three disadvantages are common: 1. During the cooling process, the workpiece that needs heat treatment is basically fixed; 2. The cooling environment is basically fixed during the cooling process; 3. The speed of the blower during the cooling process ( air volume, wind pressure) are basically fixed

Method used

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  • Heat treatment technology for high-chromium cast iron plate or hammer casting
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  • Heat treatment technology for high-chromium cast iron plate or hammer casting

Examples

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Embodiment 1

[0037] In this embodiment, heat treatment is carried out on high-chromium cast iron, and the quenched castings with slightly higher hardness are desired to be obtained. According to the rotating platform and the workpiece size (length, width, height), the workpieces are directly placed (stacked); press figure 2 The curve shown is heated and kept in the heat treatment furnace; the infrared thermometer is placed above the workpiece, and the distance h between the air outlet of the fan and the casting is adjusted to 1.2 meters. After the workpiece is taken out, it is directly hoisted to the quenching device, and then according to image 3 Carry out quenching treatment; Described quenching treatment specific process is as follows:

[0038] 1. Rotating platform: In the range of (950-1050°C) to 700°C, the rotation speed of the platform changes from 15 rpm to 30 rpm; in the range of 700°C to 450°C, the rotation speed remains unchanged at 30 rpm, 450 ℃ to 220 ℃ range from 30 rpm to ...

Embodiment 2

[0045] In this embodiment, heat treatment is carried out on high chromium castings. In order to obtain quenched workpieces with slightly lower hardness, the workpieces are directly placed (stacked) according to the rotating platform and the dimensions (length, width, height) of the workpieces; press figure 2 The curve shown is heated and kept in the heat treatment furnace; the infrared thermometer is placed above the workpiece, and the distance h between the air outlet of the fan and the casting is adjusted to 1.8 meters. After the workpiece is taken out, it is directly hoisted to the quenching device, and then according to Figure 4 Carry out quenching treatment; Described quenching treatment specific process is as follows:

[0046] 1. Rotating platform: in the range from (950-1050°C) to 700°C, the rotation speed of the platform remains unchanged at 28 rpm; in the range from 700°C to 450°C, the rotation speed gradually decreases from 28 rpm to 13 rpm , 450°C to 220°C range ...

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Abstract

The invention discloses a heat treatment technology for a high-chromium cast iron plate or a hammer casting, and belongs to the technical field of metal material heat treatment. According to the technology, the casting is subjected to heating and heat preservation treatment in a heat treatment furnace under the condition of 950-1150 DEG C at first; the workpiece is placed on a rotary platform to be subjected to quenching treatment after being taken out of the furnace; and in the quenching treatment process, a fan is adopted to blow the workpiece, water is sprayed onto the surface of the workpiece, and products different in hardness are obtained by adjusting the workpiece rotation speed, the fan rotation speed and the water spraying quantity in the workpiece cooling process. According to chemical components of the casting, the structure of the workpiece in the quenching state is improved by changing the quenching environment under the condition that the components, the structure and theheat treatment temperature of the workpiece are not changed.

Description

technical field [0001] The invention relates to the technical field of heat treatment of metal materials, in particular to a heat treatment process for high-chromium cast iron plates or hammer castings. Background technique [0002] The structure and performance of steel materials are determined by the chemical composition and heat treatment process. For steel castings, once the chemical composition is determined, the heat treatment method of the casting plays a very important role in the structure and performance of the material. The casting heating temperature, heat treatment time and quenching medium are all key factors in the heat treatment method. [0003] High chromium cast iron is the abbreviation of high chromium white wear-resistant cast iron, because it has higher wear resistance than alloy steel, higher toughness and strength than ordinary white cast iron, and good high temperature resistance and corrosion resistance. The production is convenient and the cost is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D1/667C21D5/04C21D9/00
CPCC21D1/18C21D1/667C21D5/04C21D9/0068C21D9/0081
Inventor 马清杰
Owner 马清杰
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