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Preparation method of stainless steel pipe for sealing ring with high resilience

A technology of stainless steel pipe and high resilience, which is applied in the preparation process of 1Cr18Ni9Ti seamless thin-diameter steel pipe for sealing ring and the field of preparation of stainless steel pipe for sealing ring. Sensitivity and other issues, to achieve excellent rebound performance, ensure comprehensive performance, and reasonable compression load

Active Publication Date: 2018-04-13
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The 1Cr18Ni9Ti seamless thin-diameter pipe in the solid solution state usually has a deformation of 45% to 60%, and then undergoes a solid solution treatment at 1020°C. The strength of the pipe in this state is relatively low, and the rebound performance can only reach about 0.18mm. , can not meet the requirements of the index. For the cold deformation of the pipe, the greater the rolling deformation, the greater the compression rebound performance and the compression load per unit length.
However, because the rolling deformation of the pipe is difficult to control accurately, and the relationship between the compression load per unit length and the rolling deformation is sensitive, it is easy to cause the compression load per unit length to be too high, so the production of pipes is difficult, and the batch stability is not good. , and cannot meet the high-performance requirements in the aerospace field

Method used

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  • Preparation method of stainless steel pipe for sealing ring with high resilience
  • Preparation method of stainless steel pipe for sealing ring with high resilience
  • Preparation method of stainless steel pipe for sealing ring with high resilience

Examples

Experimental program
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preparation example Construction

[0028] like figure 1 Shown is the preparation process flow diagram of the stainless steel tube for sealing ring with high resilience performance of the present invention, as can be seen from the figure The preparation method for the stainless steel tube for sealing ring with high resilience performance of the present invention comprises the following steps:

[0029] (1) The method of vacuum induction melting + electroslag is used to smelt steel ingots, and the ingots are forged into steel rods. The chemical composition range is in accordance with the requirements of GJB2294-95;

[0030] (2) Hot perforating the steel rod at 1050-1080°C to obtain a stainless steel tube blank;

[0031] (3), the stainless steel tube blank is carried out N times intermediate treatment, obtains stainless steel pipe transition piece; Said intermediate treatment comprises intermediate rolling or drawing, and intermediate heat treatment, wherein the deformation of each intermediate rolling or drawing i...

Embodiment 1

[0039] 1Cr18Ni9Ti austenitic stainless steel was prepared by vacuum induction + electroslag process, and 1Cr18Ni9Ti steel rod was prepared after forging. The chemical composition is shown in Table 1.

[0040] Chemical composition of the alloy in table 1 (wt.%)

[0041] C

Mn

Si

P

S

Ni

Cr

Ti

Fe

0.039

0.67

0.28

0.010

0.004

10.10

17.62

0.51

Remain

[0042] The specific production process such as figure 1 , the actual operation steps are as follows:

[0043] (1) Hot piercing is performed on the steel bar at 1060°C, and the size after piercing is Φ38×5mm.

[0044] (2) Perform intermediate rolling or drawing repeatedly on the tube blank after hot piercing, and perform intermediate heat treatment. The number of repetitions is 6 times, the amount of intermediate rolling or drawing deformation is controlled at 48%, and the intermediate heat treatment temperature is controlled at 1025°C; the size of the tube blan...

Embodiment 2

[0054] Using the same chemical composition and the same hot piercing process as in Example 1, a tube blank with a diameter of 38×5 mm was obtained. According to the process figure 1 Do the following:

[0055] (1) Perform intermediate rolling or drawing repeatedly on the tube blank after hot piercing, and perform intermediate heat treatment. In this embodiment, the intermediate process adopts multi-pass rolling deformation, and part of the passes adopts drawing deformation. The amount of rolling and drawing deformation are both controlled at 50%, the intermediate heat treatment temperature is 1030 °C, and the tube blank size of the steel pipe transition piece is controlled as Φ5.2×1mm.

[0056] (2) Complete the finished product rolling of the steel pipe transition piece, and the rolling deformation is controlled at 70%;

[0057] (3) Perform annealing heat treatment at 920° C. on the finished rolled steel pipe; the treatment time is 20 minutes, and the obtained steel pipe has...

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Abstract

The invention relates to a preparation method of a stainless steel pipe for a sealing ring with high resilience. A combined preparation process of middle deformation rolling+intermediate heat treatment and large deformation rolling+medium temperature annealing is adopted to prepare a stainless steel pipe blank with excellent resilience and reasonable unit length compression load through controlling residual machining hardening in a pipe; and in a stainless steel seamless fine-diameter pipe produced by the process, the resilience of the pipe can reach above 0.25 mm, the unit length compressionload can be precisely controlled within 0.15-0.20 kN / mm, the corresponding yield strength can reach above 580 MPa, and the ductility can reach above 40%. An O-shaped ring sealing element manufacturedby using the high-performance seamless fine-diameter pipe can be used for fixed sealing or movable sealing of high-pressure containers and ultrahigh-vacuum system pipelines in such fields as space environment, rockets, aviation and spaceflight, and can realize functions of repeated disassembly and repeated use.

Description

technical field [0001] The invention relates to a preparation method of a high-resilience performance stainless steel pipe for a sealing ring, and further relates to a preparation process for a high-resilience performance of a 1Cr18Ni9Ti seamless thin-diameter steel pipe for a sealing ring; it belongs to the field of manufacturing stainless steel sealing rings. Background technique [0002] The metal hollow O-ring is a special seal formed by bending a small-diameter tube into a circle, welding the two ends of the tube by electron beam or other welding methods, and then grinding the joint to a certain extent. In some high-temperature applications, in order to ensure the sealing effect of the sealing ring, a certain amount of inert gas needs to be filled inside the tube. At high temperature, the expansion of the gas will increase the elasticity of the tube, thereby offsetting the decline in the performance of the tube due to temperature rise. do adverse effects. Due to the wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/10
CPCC21D8/105
Inventor 姜海昌王本贤戎利建付鸿潘雪新白湘云吴福迪
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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