Clad Chequered Steel Structure for Corrosion-Resistant High Strength
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Solution Overview
Problem
Chequered steel sheets face issues such as corrosion, low strength, and difficulty in welding due to differences in physical properties between the substrate and cladding layers, leading to instability and uneven surface quality during rolling.
Innovation Solution
A high-strength corrosion-resistant cladding chequered steel is developed by using a substrate with specific chemical elements like C, Si, Mn, Al, Ti, Nb, and a transition layer with a gradient distribution to enhance bonding and mechanical properties, combined with an austenitic stainless steel cladding layer for improved corrosion resistance and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If carbon steel is used as substrate layer, then strength and structural properties are improved, but corrosion resistance deteriorates
Solution Approach 1:
The invention uses a composite structure with carbon steel substrate layer providing strength and stainless steel cladding layer providing corrosion resistance. The substrate layer comprises carbon steel with specific chemical composition (C: 0.15-0.25%, Si: 0.10-0.50%, Mn: 0.50-2.00%, Al: 0.02-0.04%, Ti: 0.005-0.018%, Nb: 0.005-0.020%, B: 0.0005-0.0050%) while the cladding layer comprises stainless steel, creating a material that combines both strength and corrosion resistance properties.
2Strength
If stainless steel sheet thickness is increased to meet stability requirements, then yield strength and overall stability are improved, but weight increases
Solution Approach 1:
The composite structure allows using thinner stainless steel cladding layer (providing corrosion resistance) combined with optimized carbon steel substrate (providing strength), achieving high yield strength without increasing overall weight. The substrate's specific chemical composition ensures high strength while the cladding layer provides protective function.
3Reliability
If anti-corrosion treatment is applied to chequered carbon steel sheet, then corrosion resistance is improved, but production cost and labor cost increase
Solution Approach 1:
The stainless steel cladding layer provides inherent corrosion resistance without requiring additional anti-corrosion treatments. The cladding layer comprises stainless steel with chromium content ≥10.00% and nickel content ≥8.00%, which naturally resists corrosion, eliminating the need for paint applications and associated costs.
4Reliability
If anti-corrosion treatment is applied to chequered carbon steel sheet, then corrosion resistance is improved, but processing environment requirements become stricter
Solution Approach 1:
The stainless steel cladding layer provides passive corrosion resistance that does not require controlled processing environments. Unlike paint-based anti-corrosion treatments that require dust-free areas and strict environmental controls, the metallurgical cladding structure is inherently resistant and can be applied in normal rolling conditions.
5Shape
If chequered pattern is rolled onto cladding layer, then surface appearance and anti-slip properties are improved, but bonding surface separation and cracking occur due to tensile stress
Solution Approach 1:
The invention optimizes the thickness ratio between substrate layer and cladding layer, and controls the chemical composition parameters to reduce differential thermal expansion and improve bonding. The substrate layer thickness is controlled at 60-80% of total thickness, and specific alloying elements (Ti, Nb, B) are added to enhance interfacial bonding strength, preventing separation during chequer rolling.
Solution Approach 2:
The composite structure with optimized layer thickness ratio and chemical composition creates a more ductile and bonded interface. The specific composition of substrate (with Ti, Nb, B) and cladding (stainless steel) layers ensures strong metallurgical bonding that can withstand the tensile stresses generated during chequer pattern formation.
6Strength
If cladding chequered steel is produced by clad rolling, then comprehensive requirements of strength and corrosion resistance are met, but surface quality becomes uneven due to load distribution issues
Solution Approach 1:
The invention optimizes rolling parameters including temperature control (heating to 1100-1180°C, final rolling at 920-1000°C), reduction rates (total reduction ≥70%, final pass reduction 10-20%), and layer thickness ratios. These parameter optimizations ensure uniform load distribution during rolling, preventing surface defects while achieving the desired chequer pattern and maintaining high surface quality.
Data Source
AI summary
Disclosed are a high-strength corrosion-resistant cladding chequered steel and a manufacturing method therefor. The high-strength corrosion-resistant cladding chequered steel includes a substrate and a chequered cladding layer cladded on the substrate by single-sided or double-sided rolling. The mass percentages of the chemical elements of the substrate are: C: 0.01% to 0.20%, Si: 0.10% to 0.5%, Mn: 0.5% to 2.0%, Al: 0.02% to 0.04%, Ti: 0.005% to 0.018%, Nb: 0.005% to 0.020%, 0<B≤0.0003%, N≤0.006%, and the balance being steel and other inevitable impurities. The high-strength corrosion-resistant cladding steel plate has a high strength, a high corrosion resistance, a yield strength ≥470 MPa, a tensile strength ≥610 MPa, a shear strength ≥410 MPa, and an elongation ≥40%.