Silicon Steel Normalizing Substrate Oxide Control
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Solution Overview
Problem
The formation of dense oxides on silicon steel substrates during the normalizing process, which are difficult to remove and lead to increased production costs and complexity in subsequent treatments, is a challenge in silicon steel production.
Innovation Solution
Adjusting the energy input rate in the non-oxidation heating furnace section of the normalizing process to maintain an excess coefficient between 0.8 and 1.0, ensuring stable combustion and preventing the formation of dense oxides by controlling the air and fuel combustion within the furnace zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the normalizing process is not properly controlled and energy input rate is not effectively controlled, then the excess coefficient cannot be stably controlled at 1.0, but local excess oxygen concentrates in the furnace and dense oxides form on the substrate surface which are difficult to remove
Solution Approach 1:
The patent applies parameter changes by precisely controlling the energy input rate of furnace zones to maintain the excess coefficient within 0.95-1.05. This parameter control prevents local excess oxygen concentration and subsequent dense oxide formation on the substrate surface during normalizing treatment
Solution Approach 2:
The patent implements feedback control through continuous monitoring and adjustment of the excess coefficient during the normalizing process. By using the excess coefficient as a feedback parameter to regulate energy input, the system maintains stable combustion conditions and prevents oxide formation
2Ease of manufacture
If conventional normalizing processes are used without precise energy input control, then the process is simpler, but dense oxides form on the substrate surface requiring complicated and costly subsequent acid pickling treatments
Solution Approach 1:
The patent applies preliminary action by controlling the combustion conditions in advance during the normalizing process to prevent dense oxide formation. By maintaining the excess coefficient within 0.95-1.05 before oxides can form, the need for complex subsequent acid pickling treatments is eliminated
3Productivity
If the excess coefficient is not stably controlled, then the normalizing process can proceed without precise control, but reducing atmosphere cannot be maintained and dense oxides form that increase production cost
Solution Approach 1:
The patent maintains productivity by implementing precise parameter control of the excess coefficient (0.95-1.05) during normalizing. This control prevents dense oxide formation, thereby avoiding the need for costly oxide removal treatments and reducing overall production costs
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
This method effectively prevents the formation of dense oxides, simplifies subsequent processing steps, and reduces production costs by maintaining a reducing atmosphere and ensuring high-quality normalized silicon steel substrates.
Implementation Method 1
the excess coefficient α of said non-oxidation heating furnace section is controlled within the range of 0.8≦α<1.0, so that a reducing atmosphere can be maintained in the whole non-oxidation heating furnace section
Implementation Method 2
The local excess oxygen will react with Si, Al, Mn, etc., and form on the substrate surface a layer of hardly removable dense oxides
Data Source
AI summary
A method for producing a silicon steel normalizing substrate comprises: steelmaking, hot rolling and normalizing steps. The normalizing step uses a normalizing furnace having a nonoxidizing heating furnace section. The nonoxidizing heating furnace section comprises more than 3 furnace zones. An energy investment ratio of the furnace zones used in the nonoxidizing heating furnace section is adjusted, so as to control an excess coefficient α of the nonoxidizing heating furnace section to be within a range of 0.8≦α<1.0.