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A heat treatment process for metallurgical furnace drill rod

A technology for metallurgical furnaces and drill rods, applied in heat treatment furnaces, heat treatment equipment, metal material coating processes, etc., can solve problems such as poor wear resistance, complex working environment of drill rods, and short fatigue life, so as to improve wear resistance The effect of contact fatigue strength, avoiding frequent brittle damage, and improving fatigue life

Active Publication Date: 2016-09-21
NORTHWEST RES INST OF MINING & METALLURGY INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the working environment of the drill rod is complex and the quality requirements are high.
At present, most of the drill rods used in the blast furnace tapping operation in the metallurgical industry adopt the rod body thread quenching (820°C) → low temperature tempering (200°C) process in the heat treatment production process. The process is simple, the fatigue life is low, and the wear resistance is poor, so that As a result, during the use of the drill rod, brittle damage is frequent, the tail thread is seriously damaged, and the fatigue life is short, which seriously affects the use effect
The average life of the chisel only reaches 3-5 times / branch

Method used

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Embodiment Construction

[0019] A metallurgical furnace drill rod heat treatment process, comprising the following process steps:

[0020] (1) Carbonitriding. The specific steps of carbonitriding are as follows: use ammonia gas as the nitriding agent and kerosene as the carburizing agent; after the workpiece is loaded, feed ammonia gas at a rate of 2.8 liters per minute until the workpiece comes out of the furnace; after the workpiece is loaded, Control the drop rate of kerosene to 20D / min. When the furnace temperature rises to 930°C, increase the drop rate of kerosene to 65D / min and keep warm for 1 hour; then reduce the drop rate of kerosene to 40D / min and keep warm for 2 hours. Infiltration stage; then lower the furnace temperature to 850°C, drop kerosene to 30D / min, keep warm for 1 hour, this stage is the diffusion stage, and then the workpiece is released from the furnace;

[0021] (2) Use the residual temperature of carbon and nitrogen co-infiltration to spray oil and quench the threaded part of...

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Abstract

The invention provides a metallurgical furnace drill rod heat treatment technology. The technology comprises the following steps: 1, carbonitriding; 2, quenching the screw thread position of the drill rod by utilizing carbonitriding waste heat for 10min; 3, integrally normalizing the drill rod at 800-850DEG C for 25min; 4, carrying out low temperature tempering at 200DEG C for 2h; 5, shot-blasting; 6, phosphating; and 7, waxing. The technology can obviously improve key technological indexes comprising the fatigue life, the wear resistance, the surface hardness and the like, and simplifies the process and saves energy by quenching the screw thread of the drill rod through using carburizing waste heat; and the average life of the drill rod treated by the technology reaches tap hole 10-15 times / rod.

Description

technical field [0001] The invention belongs to the field of heat treatment of drill tools, and relates to a heat treatment process for drill rods of metallurgical furnaces. Background technique [0002] When the drilling rod of the metallurgical furnace is working, the torque is transmitted between the tapping machine and the gun mud under the drive of the tapping machine, so that the entire drilling tool system rotates and the powerful impact energy of the piston is transmitted. Its working conditions are very harsh. In addition to transmitting high-frequency impact energy, it is also subjected to high temperature, torsional bending, wear and medium corrosion on the surface of the water hole. Therefore, the working environment of the drill rod is complex and the quality requirements are high. At present, most of the drill rods used in blast furnace tapping operations in the metallurgical industry adopt the rod body thread quenching (820°C)→low temperature tempering (200°C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/00C23C8/30C23C8/54C23C8/74C23C22/07C23F17/00
Inventor 王晨李琦周矿兵梁友乾任永谦吉鸿安
Owner NORTHWEST RES INST OF MINING & METALLURGY INST
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