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A heat treatment method for metal elbows

A heat treatment method and elbow technology, which is applied in the field of heat treatment, can solve the problems of unstable mechanical properties, unevenness, and thermal stress treatment of metal elbows, and achieve the effects of stable mechanical properties, long service life, and thermal stress balance

Active Publication Date: 2018-06-01
JIANGSU YANGGUANG MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] If the elbow is processed by welding, there will be a big difference in the thermal stress between the welding part of the elbow and the elbow body. If the general heat treatment furnace is used for processing, the thermal stress treatment in the elbow will Not uniform enough, resulting in unstable mechanical properties of the metal elbow

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] ① Prepare an iron basin with a thickness of 5mm, put fine iron sand, quartz sand and silicon carbide in the iron basin, and control the weight ratio of iron sand, quartz sand and silicon carbide at 1:2:1, and then heat-treated The metal elbow is completely buried in the fine sand, and the fine sand should fill the inner space of the elbow;

[0014] ② Put the iron basin into the heat treatment furnace, raise the temperature to 600°C at a rate of 10°C / min, keep it for 20 minutes, then raise the temperature to 800°C at a rate of 20°C / min, keep it for 10 minutes, and then Lower the temperature to 400°C at a speed of 30°C / min, keep it for 5 minutes, then raise the temperature to 550°C at a speed of 25°C / min, keep it for 10 minutes, then raise the temperature to 600°C, keep it for 20 minutes, then increase the temperature to 700°C at a rate of 10°C / min, keep it for 10 minutes, then lower the temperature to 500°C at a rate of 25°C / min, keep it for 8 minutes, then increase the ...

Embodiment 2

[0017] ① Prepare an iron basin with a thickness of 8mm. Put fine iron sand, quartz sand and silicon carbide into the iron basin. The weight ratio of iron sand, quartz sand and silicon carbide is controlled at 1:5:3, and then heat-treated The metal elbow is completely buried in the fine sand, and the fine sand should fill the inner space of the elbow;

[0018] ②Put the iron basin into the heat treatment furnace, raise the temperature to 600°C at a rate of 10°C / min, keep it for 25 minutes, then raise the temperature to 800°C at a rate of 20°C / min, keep it for 15 minutes, and then Lower the temperature to 400°C at a speed of 30°C / min, keep it for 10 minutes, then raise the temperature to 550°C at a speed of 25°C / min, keep it for 15 minutes, then raise the temperature to 5°C / min 600°C, keep it for 25 minutes, then increase the temperature to 700°C at a rate of 10°C / min, keep it for 15 minutes, then lower the temperature to 500°C at a rate of 25°C / min, keep it for 15 minutes, then ...

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Abstract

The invention discloses a heat treatment method for a metal elbow. According to the heat treatment method for the metal elbow, the metal elbow is embedded into fine sand formed through mixing of iron sand, quartz sand and silicon carbide, then the metal elbow is placed in a heat treatment furnace for heat treatment, after treatment is completed, an iron bowl is taken out and cooled with cold water, the iron bowl is placed in the heat treatment furnace again for high-temperature treatment, and finally the iron bowl is taken out and cooled to the indoor temperature. By the adoption of the heat treatment method for the metal elbow, the thermal stress difference between the welded portion and the elbow body of the metal elbow can be effectively eliminated, the overall thermal stress of the metal elbow tends to be balanced, the internal thermal stress of the metal blow is more uniform, and the metal elbow produced in this way is more stable in mechanical performance and longer in service life.

Description

technical field [0001] The invention relates to a heat treatment method, more precisely, a heat treatment method of a metal elbow. Background technique [0002] Elbows are fittings that change the direction of a pipeline. According to the angle, there are three most commonly used ones: 45° and 90°180°, and other abnormal angle elbows such as 60° are also included according to engineering needs. Elbow materials include cast iron, stainless steel, alloy steel, malleable cast iron, carbon steel, non-ferrous metals and plastics. The ways to connect with the pipe include: direct welding, flange connection, hot-melt connection, electric fusion connection, thread connection and socket connection, etc. According to the production process, it can be divided into: welding elbow, stamping elbow, push elbow, casting elbow, butt welding elbow, etc. [0003] If the elbow is processed by welding, the thermal stress between the welding part of the elbow and the elbow body will be quite d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/08
CPCC21D9/08
Inventor 梅雪源
Owner JIANGSU YANGGUANG MACHINERY MFG
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