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Method for predicting dwell time for strain-strengthening austenitic stainless steel low temperature container

A technology of austenitic stainless steel and low temperature container, which is applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve the problems such as the uncertainty of the holding pressure process time and the influence of the strain hardening process time on the product production cycle, and achieves technical feasibility, Simple operation and accurate prediction

Active Publication Date: 2013-09-25
ZHEJIANG UNIV
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Problems solved by technology

Due to the existence of creep, the time of the holding process cannot be determined, which has a great impact on the time of the entire strain strengthening process and the determination of the production cycle of the product

Method used

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  • Method for predicting dwell time for strain-strengthening austenitic stainless steel low temperature container
  • Method for predicting dwell time for strain-strengthening austenitic stainless steel low temperature container
  • Method for predicting dwell time for strain-strengthening austenitic stainless steel low temperature container

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Embodiment Construction

[0023] Taking the domestic typical austenitic stainless steel S30408 ​​material as an example, the main process of the prediction method of strain-strengthening holding pressure time for low-temperature vessels made of austenitic stainless steel based on the normal temperature creep theory is further described:

[0024] (1) Through the material test, the stress-dependent curve of the normal-temperature creep of austenitic stainless steel for cryogenic vessels is established.

[0025] Take the austenitic stainless steel to be processed, and carry out the tensile test at room temperature according to the standard GB / T 228.1. The test process is controlled by force. After stretching the sample at the same rate to the set stress, the pressure is maintained until the strain change becomes stable, and relevant data are collected. The value range of the set stress σ should be within the material yield strength (Rp 0.2 ) and the enhanced pressure of the container;

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Abstract

The invention relates to manufacture of a low temperature container, and intends to provide a method for predicting dwell time for strain-strengthening an austenitic stainless steel low temperature container. The method comprises: by a material tensile test, establishing a stress correlation curve of an austenitic stainless steel normal temperature creep deformation amount for the low temperature container; carrying out non-linear value simulation and analysis of the low temperature container made of austenitic stainless steel in a strain strengthening process, searching maximum stress at a cylinder continuous part under strengthening pressure, and recording a perimeter of the cylinder where the maximum stress lies, that is a cylinder perimeter; and obtain alphamax relative to the maximum stress by searching an alpha-sigma curve, and then calculating the dwell time of strain strengthening. The method can make a dwell technology of a pressure vessel avoid inconvenience of real time and multi-thread artificial monitoring, implements prediction of the dwell time in advance, and simultaneously accurately predicting a case of each part of the container suffering from dwell influence. The method has advantages of accurate prediction, simple operation, and feasible technology, and can be directly used in an Industrial field.

Description

technical field [0001] The invention relates to the field of low-temperature containers, in particular to a calculation method for predicting the maximum position of the strain amount in the pressure-holding stage and the minimum time required for pressure-holding in the strain strengthening process of the low-temperature container made of austenitic stainless steel. Background technique [0002] Austenitic stainless steel is widely used in the manufacture of cryogenic vessels because of its good plasticity, toughness and low temperature performance. The yield ratio of this material (the ratio of yield strength to tensile strength) is low, so its allowable stress is low in the design and manufacture of conventional cryogenic vessels, and the bearing capacity of the material is not fully utilized. In view of this characteristic, the strain strengthening technology increases the allowable stress by increasing the yield strength of the material, and realizes the weight reductio...

Claims

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Application Information

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IPC IPC(8): C21D7/02C21D11/00
Inventor 郑津洋晓风清缪存坚朱晓波马利
Owner ZHEJIANG UNIV
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