Electroslag remelting furnace quality appraisal

electroslag remelting furnace takes electroslag metallurgy technology as its core principle. By optimizing the melting current, slag composition and crystallizer cooling efficiency, it achieves the synergy of high purity, composition uniformity and dense structure of metal materials. It is widely used in the production fields of special steel, high temperature alloys and precision castings. In the manufacturing of aerospace engine components, it is used to eliminate inclusions and pore defects; in nuclear power equipment, it meets the demand for high corrosion resistance materials. Compared with traditional smelting equipment, electroslag remelting furnaces have the characteristics of controllable molten pool depth, high impurity removal efficiency and directional solidification. They are the core equipment for high-quality metal preparation.

Zhongke Testing is a product quality appraisal service organization registered with the court. It can provide electroslag remelting furnace quality appraisal services. It has a professional appraisal team and advanced instruments and equipment to provide fair and accurate appraisal results for electroslag remelting furnace quality appraisal.

As the demand for special materials increases, related quality dispute cases increase significantly. The focus of judicial disputes is:

1. Disputes over performance indicators: metal purity does not meet the standard and the surface cracks on the ingot surface exceed the standard;

2. Material defects: the electrode material has high impurity content and the slag composition deviates from the process requirements. ;

3, process problems: insufficient crystallizer cooling efficiency, abnormal melting current fluctuations;

4, contract performance dispute: core modules (such as import control system, high-precision crystallizer) are inconsistent with the technical agreement.

1, equipment appearance inspection

Conduct a comprehensive inspection of the appearance of the electroslag remelting furnace, including the furnace body, electrical control cabinet, cooling system and other components. Check whether there is any obvious damage, deformation, corrosion, etc., and record the appearance of the equipment.

2, performance test

In accordance with the requirements of the technical contract and relevant standards, various performance indicators of the electroslag remelting furnace were tested. For example, test melting capacity, temperature control accuracy, power consumption, etc. Through performance testing, determine whether the equipment can operate normally and meet the requirements agreed in the contract.

3, electrical system detection

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A special steel factory of the applicant signed a "High Temperature Alloy Electroslag Remelting Furnace Purchase Contract" with an equipment manufacturer of the respondent, stipulating that the inclusion level of the ingot is ≤ Class B 0.5. After being put into production, the measured inclusions reached Class B level 1.2. The manufacturer argued that it was caused by insufficient purity of raw materials.

identification and analysis results:

The quality analysis expert team conducted relevant data on the "Electroslag Remelting Furnace", contract technical agreements, on-site investigation case materials and other data. After discussion and comprehensive technical analysis, the following quality analysis opinions were made:

The electrode sulfur content of the electroslag remelting furnace involved exceeded the standard by three times, the crystallizer cooling water flow rate was less than 30% of the agreed value, and the slag component Al₂O₃ proportion deviation exceeded 5%.

The appraisal conclusion determined that defects in electrode materials and process control were the main reasons for excessive inclusions.

electroslag remelting furnace quality appraisal report should include:

1, appraisal purpose and reference standards;

2, equipment model involved, process parameter records and control system logs;

3, detection List of methods and equipment;

4, analysis of correlation between test data and failure;