Ensuring the quality of manganese steel casting needs to be done from several aspects, the following are some key measures:
1. Raw material control
• Selection of high quality manganese steel raw materials to ensure that their chemical composition meets the standard requirements.
• The manganese content plays a key role in the performance of the product. Within a certain range (e.g. Mn13Cr2, 11.5-14%), the higher the manganese content, the better the performance of the product in general, but the cost of the raw material will be higher accordingly.
• Strict incoming inspection of raw materials is carried out.
2. Casting process design
• Carefully design the casting process programme, including casting method, pouring system, risers and cold iron settings.
• According to the shape, size and performance requirements of the casting, reasonably determine the casting parameters, such as pouring temperature, pouring speed and so on.
• Selection of casting process, such as sand water glass casting process and disappearing mould casting process.
3. Mould making
• 3D scanner and 3D modelling to make the manganese steel casting conform to the overall geometry and ensure perfect installation and fitment with the machine.
• Manufacture high precision moulds to ensure the dimensional accuracy and surface quality of the castings.
• Regular maintenance and inspection of the moulds to repair the worn and damaged parts in time.
4. Melting process control
• Select the medium frequency electric furnace which has the advantages of high melting efficiency, energy saving, environmental protection and convenient operation.
• Strictly control the melting process temperature, time and stirring and other operations to ensure uniform composition of the liquid steel.
• Adopt suitable deoxidation and refining process to remove the gas and inclusions in the liquid steel.
5. Pouring operation
• Avoid splashing and oxidising of molten steel during pouring to ensure smooth filling of molten steel.
• Control the pouring speed and time to ensure that the solidification sequence of the castings is reasonable.
6. Heat treatment
• Formulate reasonable heat treatment process according to different applications, such as water toughening, etc., to improve the structure and properties of castings.
• Strictly control the heat treatment temperature, time and cooling speed and other parameters.
7. Quality Inspection
• Conduct a comprehensive quality inspection of castings, including appearance inspection, dimensional measurement, chemical composition analysis, mechanical properties testing, hardness analysis, etc.
• Use non-destructive testing methods, such as ultrasonic testing, PT testing, etc., to detect defects within the castings.
In conclusion, to ensure the quality of manganese steel casting, it is necessary to carry out strict control and management in all aspects such as raw materials, process design, production operation, quality inspection, etc., in order to ensure that the product quality meets the design requirements.
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