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Ultra-high pressure composite reinforcement process for rear cutting sleeve of stainless steel double caliper sleeve type tube union

A stainless steel, ferrule type technology, applied in the field of composite strengthening process of the rear ferrule, can solve the problems such as hindering the development of ultra-high pressure technology and being expensive, and achieve the effects of eliminating machining tool marks, reducing processing costs and improving strength.

Inactive Publication Date: 2009-07-29
江苏鑫国精密模具有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the quality of imported ultra-high pressure pipe valves and equipment is good, the price is extremely expensive, which has almost become a technical bottleneck hindering the development of ultra-high pressure technology in my country

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0013] Example 1: First, take 17-4PH martensitic precipitation-hardening stainless steel to prepare the ferrule blank, its composition is: C0.04%, Mn0.30%, Si0.60%, Cr16.0%, Ni4.2%, Cu3 .4%, Nb0.25%; and then carry out aging treatment at 480°C on the blank of the rear ferrule with a margin; Double strengthening, the internal hardness of the rear ferrule obtained reaches HRC42, and the surface hardness reaches HRC46.

example 2

[0014] Example 2: First, take 17-4PH martensitic precipitation hardening stainless steel to prepare the rear ferrule blank, its composition is: C0.04%, Mn0.30%, Si0.60%, Cr16.0%, Ni4.2%, Cu3 .4%, Nb0.25%; then carry out aging treatment at 540°C on the back ferrule blank with a margin; finally carry out cold rolling on the tooling of the general machine tool, and the rolling margin is controlled at 0.20mm; through the above Double strengthening, the internal hardness of the rear ferrule obtained reaches HRC43, and the surface hardness reaches HRC47.

example 3

[0015] Example 3: Firstly, take 17-4PH martensitic precipitation hardening stainless steel to prepare the ferrule blank, its composition is: C0.04%, Mn0.30%, Si0.60%, Cr16.0%, Ni4.2%, Cu3 .4%, Nb0.25%; and then carry out aging treatment at 600°C on the blank of the rear ferrule with a margin; Double strengthening, the internal hardness of the rear ferrule obtained reaches HRC44, and the surface hardness reaches HRC48.

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PUM

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Abstract

The invention discloses a complex reinforced technology for back bites of superhigh pressure stainless steel double bite type tube fittings; and the material of the back bites is 17-4PH martensite precipitation-hardening stainless steel. The invention is characterized in that the complex reinforced technology for back bites comprises two processes of aging treatment and cold rolling; the blanks of the back bites with allowance are firstly subject to aging treatment at the temperature of 480-600 DEG C; and then the blanks are subject to cold rolling on tools of a general purpose machine, and the cold rolling allowance is controlled to be 0.18-0.22mm. In the invention, double reinforcement is carried out on the back bites by aging treatment and cold rolling and the hardness of the back bites is adjusted to be an ideal state so that the mechanical property of front and back bites can better accord with different requirements for sealing and force transferring and the sealing quality of tube fittings working under superhigh pressure is improved.

Description

technical field [0001] The invention relates to the technical field of pipeline fluid control, in particular to a composite strengthening process of a rear ferrule of a small-caliber ultra-high pressure stainless steel double ferrule type pipe joint. Background technique [0002] Ultra-high pressure technology has been widely used in petrochemical, mechanical processing, food, pharmaceutical, material preparation, etc. Due to the high pressure, the requirements for the pipe and valve parts serving under the working conditions of frequent pressurization and pressure relief are more stringent. At present, there are only a small number of manufacturers in my country that produce ultra-high pressure pipe valve parts, but the quality cannot pass the standard. Most companies only assemble or sell ultra-high pressure pipe valve parts and equipment from foreign developed countries. High-pressure pipe valve parts basically rely on imports. Although the quality of imported ultra-high...

Claims

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Application Information

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IPC IPC(8): C21D6/00C21D7/04
Inventor 孙国云刘忠德
Owner 江苏鑫国精密模具有限公司
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