Direct Analysis Sampler for Molten Steel Rapid Chilling
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Solution Overview
Problem
Conventional sampling devices for molten metals, particularly steel, require extensive surface preparation and are inefficient in producing oxide-free samples for direct analysis by optical emission spectroscopy, leading to increased analysis time and costs due to the need for mechanical grinding and handling of large sample volumes.
Innovation Solution
A rapid chilled sampler with a two-part sample chamber design that allows for uniform filling and rapid chilling of molten metal, producing a solidified strip sample with an optimized geometry for direct analysis on optical emission spectrometers without surface preparation, utilizing a pneumatic-assisted inert gas purge system for deoxidation and minimizing sample volume to prevent metal and non-metallic segregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional sampling devices are used to extract molten metal samples, then samples can be obtained for analysis, but extensive surface preparation (mechanical grinding) is required and analysis time increases
Solution Approach 1:
The patent changes the thermal parameters by implementing rapid chilling of the molten metal sample immediately after extraction. This rapid cooling transforms the sample's thermal state, preventing oxidation and eliminating the need for surface grinding, thus resolving the contradiction between surface quality and analysis time
Solution Approach 2:
The patent utilizes the phase transition of molten metal from liquid to solid state through rapid chilling. This controlled phase transition occurs so quickly that it prevents oxide formation on the surface, producing a ready-to-analyze sample without requiring mechanical preparation
2Quantity of substance
If larger sample volumes are taken for analysis, then representative samples are obtained, but handling and processing becomes more difficult and time-consuming
Solution Approach 1:
The patent optimizes the sample volume parameter by extracting and rapidly chilling a controlled amount of molten metal. This parameter change produces a compact solidified sample that is representative of the bulk material but easy to handle and process, resolving the contradiction between sample quantity and operational ease
3Temperature
If samples are exposed to atmosphere during cooling, then cooling can occur, but oxidation of the sample surface occurs requiring additional preparation
Solution Approach 1:
The patent employs extremely rapid phase transition from liquid to solid state, cooling the sample so quickly that oxidation cannot occur during the cooling process. This rapid chilling method protects the sample from atmospheric oxidation while achieving the necessary temperature reduction, eliminating the need for protective atmospheres or post-cooling preparation
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 enables rapid, cost-effective, and oxide-free analysis of molten steel samples, reducing the need for mechanical grinding and handling, while ensuring accurate chemical composition analysis directly on existing OES equipment, thereby improving analysis speed and reducing operational expenses.
Implementation Method 1
The sample chamber comprises a housing made of a material with high thermal conductivity that enables uniform and rapid chilling of the molten metal sample
Implementation Method 2
rapid chilling of the molten metal sample, such that the entire sample section freezes uniformly
Data Source
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AI summary
A sampler for taking samples from a molten metal bath, particularly a molten steel bath, includes a sample chamber assembly having a cover plate and a housing. The housing has first and second openings for an inflow conduit and a gas coupler, respectively. The first face of the housing includes a distribution zone, an analysis zone and a ventilation zone. A depth of the analysis zone is greater than 1.5 mm and less than 3 mm. The cover plate and the housing assemble together to form a sample cavity. An analysis surface of a solidified steel sample formed within the sample cavity lies in a first plane. In a flow direction of the molten steel, there are no increases in a width dimension of the sample cavity and a ratio of the length to depth of the sample cavity increases.