Duplex Stainless Clad Plate Composition for Strong Low-Cost Bonding
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Solution Overview
Problem
Current methods for producing duplex stainless clad steel plates face challenges in achieving good corrosion resistance and bonding strength while keeping production costs low, as they often require high-vacuum conditions and strict control of impurity elements, which can increase costs and reduce toughness.
Innovation Solution
A duplex stainless clad steel plate with a carbon steel or low alloy steel base and a duplex stainless steel cladding material, where the cladding material has a modified pitting resistance equivalent number (PREN_Mn) between 25 and 40, hydrogen content of 3.0 ppm or less, and a shearing strength of 350 MPa or more, produced using vacuum drawing and hot rolling processes that control the precipitation of σ phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-vacuum conditions and strict control of impurity elements are used to produce duplex stainless clad steel plates, then bonding strength and corrosion resistance are improved, but production costs increase
Solution Approach 1:
The invention changes the chemical composition parameters of the duplex stainless steel cladding material by strictly controlling the content ranges of specific alloying elements (C: 0.03-0.08%, Si: 0.01-0.05%, Mn: 0.05-1.00%, P: 0.003-0.030%, S: 0.003-0.010%). This parameter optimization allows achieving good bonding strength and corrosion resistance without requiring high-vacuum conditions or excessive impurity control, thereby reducing production costs
Solution Approach 2:
The invention uses a composite structure consisting of a base metal (carbon steel or low alloy steel) and a duplex stainless steel cladding material with optimized composition. This composite material design allows the cladding layer to provide corrosion resistance while the base metal provides structural strength, achieving cost-effective performance without requiring expensive high-vacuum processing
2Reliability
If high-vacuum conditions and strict control of impurity elements are used to produce duplex stainless clad steel plates, then corrosion resistance is improved, but production costs increase
Solution Approach 1:
The invention optimizes the chemical composition parameters of the duplex stainless steel cladding material, specifically controlling the content ranges of alloying elements (C: 0.03-0.08%, Si: 0.01-0.05%, Mn: 0.05-1.00%, P: 0.003-0.030%, S: 0.003-0.010%). This parameter optimization enhances corrosion resistance by preventing harmful phase precipitation while avoiding the need for expensive high-vacuum processing and excessive impurity control
Solution Approach 2:
The invention uses a thin cladding layer (0.5-5.0 mm thickness) of duplex stainless steel on a base metal substrate, replacing the need for expensive high-vacuum processing and strict impurity control throughout the entire material. The optimized composition ensures corrosion resistance is achieved through material chemistry rather than expensive manufacturing processes
3Reliability
If alloying elements such as Cr, Ni, and Mo are increased in duplex stainless steel, then corrosion resistance is improved, but material cost increases
Solution Approach 1:
The invention optimizes the alloying element content parameters in the duplex stainless steel cladding material, setting specific ranges (C: 0.03-0.08%, Si: 0.01-0.05%, Mn: 0.05-1.00%, P: 0.003-0.030%, S: 0.003-0.010%) that provide adequate corrosion resistance without excessive alloy content. This parameter optimization reduces material cost by avoiding unnecessary alloying while maintaining protective performance
Solution Approach 2:
The invention applies corrosion protection locally through a cladding layer with optimized composition rather than using high-alloy steel throughout the entire structure. The cladding layer contains controlled amounts of alloying elements to provide corrosion resistance where needed, while the base metal provides structural support at lower cost
4Ease of manufacture
If cladding material and base metal are bonded together, then cost efficiency is improved by reducing high alloy steel amount, but bonding strength may be insufficient
Solution Approach 1:
The invention changes the chemical composition parameters of the duplex stainless steel cladding material to optimize bonding characteristics. By controlling the content ranges of alloying elements (C: 0.03-0.08%, Si: 0.01-0.05%, Mn: 0.05-1.00%, P: 0.003-0.030%, S: 0.003-0.010%), the cladding material achieves good metallurgical bonding with the base metal while maintaining cost efficiency through reduced high-alloy steel content
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 solution provides a duplex stainless clad steel plate with enhanced corrosion resistance and bonding strength at a lower cost, effectively reducing the precipitation of σ phases and maintaining necessary toughness and strength.
Implementation Method 1
a method for producing the duplex stainless clad steel plate, the method comprising: (a) a step of laminating a base metal made of a carbon steel or a low alloy steel having a surface and provided in advance with a hole that communicates with the surface, and a cladding material including a surface and made of a duplex stainless steel
Implementation Method 2
heating the clad rolled material within a temperature range of 1050 to 1250°C, performing hot rolling with a rolling reduction of 60% or more within a temperature range of 1000°C or more
Implementation Method 3
the precipitation of σ phases is reduced or prevented by a method described in Patent Document 4
Data Source
AI summary
There is provided a duplex stainless clad steel plate including a base metal and a cladding material bonded to the base metal, wherein the base metal is made of a carbon steel or a low alloy steel, the cladding material is made of a duplex stainless steel having a chemical composition that satisfies a value of modified pitting resistance equivalent number (PREN Mn) in a range from 25 to 40, the modified pitting resistance equivalent number being calculated by [Cr + 3.3(Mo + 0.5W) + 16N - Mn], a hydrogen content of the base metal is 1.0 ppm or less, a hydrogen content of the cladding material is 3.0 ppm or less, and a shearing strength of a bonding interface between the base metal and the cladding material is 350 MPa or more.