Double-Sided Stainless Clad Sheet With Rapid Cooling Strength Control
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Solution Overview
Problem
Current stainless steel composite sheets have limitations in yield strength and surface quality, making them unsuitable for applications requiring higher mechanical properties and broader industrial use.
Innovation Solution
A high-strength double-sided stainless steel clad sheet is developed with a substrate layer composed of specific chemical elements (C: 0.03-0.12%, Si: 0-0.30%, Mn: 0.2-1.0%, Al: 0.02-0.04%, Ti: 0.01-0.03%, Nb: 0.005-0.020%, N: 0.003-0.006%) and an austenitic stainless steel clad layer, subjected to solution treatment and rapid cooling, to achieve enhanced mechanical properties and corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If carbon content is increased to improve strength, then yield strength increases, but martensite formation occurs during heat treatment which deteriorates comprehensive mechanical properties and corrosion resistance
Solution Approach 1:
The patent applies parameter changes by precisely controlling the carbon content within a specific range (0.03-0.12%) rather than simply increasing it. This quantitative parameter optimization allows the material to achieve adequate strength while avoiding the formation of martensite during heat treatment, thus resolving the contradiction between strength improvement and maintaining comprehensive mechanical properties and corrosion resistance.
Solution Approach 2:
The patent creates a composite material system by combining the carbon steel substrate with stainless steel clad layers. This composite structure allows the substrate to provide strength through controlled carbon content while the stainless steel clad layers provide corrosion resistance, thereby resolving the contradiction between strength and corrosion resistance that would otherwise require high carbon content.
2Reliability
If stainless steel composite sheet is used to achieve corrosion resistance and brightness, then corrosion resistance and surface quality improve, but yield strength remains low below 200 MPa
Solution Approach 1:
The patent employs a composite material structure consisting of a carbon steel substrate layer and stainless steel clad layers. The substrate layer provides high strength properties, while the stainless steel clad layers provide corrosion resistance and surface quality. This composite approach allows both requirements to be met simultaneously without compromising either property.
Solution Approach 2:
The patent segments the material into functionally distinct layers: the substrate layer responsible for mechanical strength and the clad layers responsible for corrosion resistance and surface quality. This functional segmentation allows each layer to be optimized for its specific purpose, resolving the contradiction between strength and corrosion resistance.
3Reliability
If silicon content is increased to improve purity and deoxidation effect, then steel purity improves, but welding performance deteriorates
Solution Approach 1:
The patent applies parameter changes by controlling silicon content within a specific range (0.02-0.30%) rather than simply increasing it to maximize purity. This optimized parameter selection achieves adequate steel purity and deoxidation effect while maintaining acceptable welding performance, thus resolving the contradiction between purity improvement and welding performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The resulting clad sheet exhibits yield strength of ≥300 MPa, elongation of ≥30%, and excellent surface quality, suitable for applications in panels and storage tanks, while reducing raw material usage and costs.
Implementation Method 1
the substrate layer and the stainless steel clad layer undergo high temperature and rapid cooling treatment
Implementation Method 2
the substrate layer and the stainless steel clad layer undergo high temperature and rapid cooling treatment
Data Source
AI summary
Disclosed in the present invention is a high-strength double-sided stainless steel clad sheet, including a substrate layer, and stainless steel clad layers clad-rolled on double sides of the substrate layer. The substrate layer consists, in mass percent, the chemical elements: C: 0.03-0.12%, 0<Si≤0.30%, Mn: 0.2-1.0%, Al: 0.02-0.04%, Ti: 0.01-0.03%, Nb: 0.005-0.020%, and N: 0.003-0.006%, with the balance being iron and other inevitable impurities. Also disclosed in the present invention is a manufacturing method for the high-strength double-sided stainless steel clad sheet, including the steps of: (1) obtaining the substrate layer and the stainless steel clad layer; (2) billet making; (3) clad-rolling; and (4) solution annealing and pickling treatment: controlling the solution temperature to be 950-1020° C., and then cooling down to room temperature at an average cooling rate of 20-50° C./s.