Tin Plate Composition for Formability and Pressure Resistance
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Solution Overview
Problem
Existing tin plates for aerosol can top covers face challenges in achieving high stamping formability, pressure resistance, and maintaining surface glossiness, with prior solutions either lacking sufficient hardness for high-pressure applications or incurring high production costs and energy consumption.
Innovation Solution
A manufacturing method involving steel smelting, continuous casting, hot rolling, pickling, cold rolling, continuous annealing, temper rolling, and tinplating, with controlled chemical compositions and process parameters to achieve a tin plate with optimal hardness, strength, and surface quality, including specific temperature ranges and rolling processes to balance formability and pressure resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If low-carbon aluminum killed steel is adopted with batch annealing process, then stamping formability is improved, but product hardness is low and cannot meet high pressure resistance requirement
Solution Approach 1:
The patent changes the chemical composition parameters by precisely controlling carbon content (0.015-0.030%) and adding specific alloying elements (Mn: 0.40-0.60%, Ti: 0.045-0.065%, B: 0.0002-0.0006%) to achieve both good stamping formability and high pressure resistance simultaneously
Solution Approach 2:
The patent creates a composite microstructure consisting of ferrite and cementite phases through controlled composition and heat treatment, where ferrite provides ductility for stamping while cementite provides strength for pressure resistance
2Reliability
If interstitial-free steel is adopted with high hot rolling and annealing process temperatures, then aging resistance is improved, but energy consumption is large and oxide-scale is prone to be thickened
Solution Approach 1:
The patent optimizes the hot rolling temperature range (850-950°C) and annealing temperature range (650-750°C) to achieve appropriate aging resistance while reducing energy consumption and preventing excessive oxide-scale formation
Solution Approach 2:
The patent uses small amounts of boron (0.0002-0.0006%) as an effective grain boundary pinning agent that provides long-term aging resistance without requiring excessive energy input or creating thick oxide scales
3Illumination intensity
If tinning amount is increased to maintain surface brightness, then surface glossiness is improved, but production cost increases
Solution Approach 1:
The patent optimizes the tinning amount to 2.0-3.0 g/m² and controls the tin layer composition to achieve adequate surface brightness and glossiness while minimizing tin consumption and production cost
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 method produces a tin plate with consistent hardness, high elongation, and uniform microstructure, effectively meeting the requirements for both stamping formability and pressure resistance while reducing production costs and energy consumption.
Implementation Method 1
continuous annealing, temper rolling
Implementation Method 2
heating a steel blank to a temperature within a range from 1180° C. to 1220° C. to obtain an austenite structure, and then subjecting the steel blank to rough rolling and finish rolling
Implementation Method 3
a temperature of strip steel in a rapid cooling zone during a continuous annealing and temper rolling process is controlled at a range from 360° C. to 380° C., a cooling rate is in a range from 100° C./s to 130° C./s
Implementation Method 4
a hardness of a steel plate is improved by solid solution strengthening and precipitation strengthening to meet the requirement for the pressure resistance
Implementation Method 5
a hardness of a steel plate is improved by solid solution strengthening and precipitation strengthening to meet the requirement for the pressure resistance
Data Source
AI summary
A manufacturing method for a tin plate including a component design of low-carbon aluminum killed steel; under the condition of not increasing the alloy content and the production control difficulty, the content of elements such as C, Mn, Al and N in the tin plate is designed, and corresponding hot rolling, cold rolling, annealing and leveling processes are used; the strengthening effects of conventional elements, carbon and manganese, are fully utilized, aluminum nitride precipitation control in hot rolling is taken into account, a proper cold rolling reduction rate is selected, the ferrite grain size and cementite precipitation in steel are controlled by means of continuous annealing and over-aging treatment, and a specific temper rolling process is used, so that a tin plate having small strength and hardness fluctuations, a high elongation rate and a short yield plateau is produced.