Austenitic Stainless Steel Tube Cold Rolling Formula
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Solution Overview
Problem
Current methods for producing austenitic stainless steel tubes are laborious and costly due to the reliance on extensive trials to determine process parameters for achieving desired yield strength, with prior art lacking guidance on setting degree of hot deformation, degree of cold deformation, and ratio between tube diameter and wall reduction.
Innovation Solution
A process for producing austenitic stainless steel tubes that involves setting the degree of hot deformation, degree of cold deformation, and the ratio between tube diameter and wall reduction using a specific formula that considers the chemical composition and targeted yield strength, allowing for efficient determination of process parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If extensive trials are performed to determine process parameters, then the desired yield strength can be achieved, but the manufacturing process becomes laborious and costly
Solution Approach 1:
The patent applies parameter changes by developing a mathematical model that directly calculates optimal process parameters (degree of hot deformation, degree of cold deformation, ratio between tube diameter and tube wall reduction) based on steel composition and target yield strength. This eliminates the need for extensive trial-and-error experimentation, thereby improving manufacturing efficiency while achieving the desired yield strength precision.
2Manufacturing precision
If process parameters are determined through trials, then the target yield strength can be achieved, but the process becomes time-consuming and expensive
Solution Approach 1:
The patent implements preliminary action by pre-establishing a mathematical model that allows direct calculation of process parameters before actual production begins. The model incorporates steel composition and target yield strength to predict optimal deformation parameters in advance, eliminating time-consuming trial processes and enabling immediate production with optimized parameters.
3Ease of manufacture
If a simple formula is used for determining working ratio, then the process is simplified, but no guidance is provided for setting degree of hot deformation, degree of cold deformation, and ratio between tube diameter and tube wall reduction
Solution Approach 1:
The patent applies universality by creating a comprehensive mathematical model that simultaneously determines multiple process parameters (degree of hot deformation, degree of cold deformation, and ratio between tube diameter and tube wall reduction) through a single integrated approach. The model serves multiple functions: it simplifies the determination process while providing complete guidance for all critical parameters, making the manufacturing process both easy to execute and comprehensively controlled.
Data Source
AI summary
A process of producing an austenitic stainless steel tube comprises the steps of:a) producing an ingot or a continuous casted billet of the austenitic stainless steel,b) hot extruding the ingot or the billet obtained from step a) into a tube,c) cold rolling the tube obtained from step b) to a final dimension thereof.The outer diameter D of the cold rolled tube is 70-250 mm and the thickness t thereof is 6-25 mm, and the cold rolling step is performed such that the following formula is satisfied:(2.5×Rc+1.85×Rh−17.7×Q)=(Rp0.2target+49.3−1073×C−21Cr−7.17×Mo−833.3×N)±Z (1)wherein Rp0.2target is targeted yield strength and is 750≤Rp0.2target≤1000 MPa, 30≤Rc≤75%, 50%≤Rh≤90%, 1≤Q≤3.6, and Z is 65.