Stainless steel ingot casting either flat or cylindrical ingot often occur in the production of pores and osteoporosis defects, porosity and loose as twin sisters, often accompanied by a living, to bring a lot of trouble aluminum. Stainless steel casting circular holes exist in the organization called stomata. It is the liquid metal during the cooling and solidification process, precipitated remaining gas bubbles formed in the ingot defects. Loose organization in stainless steel casting solidification process, because the stainless steel in the liquid state and solidification process, the volume contraction are not very good complement to produce a dispersion holes. The main factor in the formation of pores: dissolved gas in the melt is saturated melt in the presence of a large number of non-metallic slag, gases in the casting process of slow floating rate, the bubble will remain in the ingot blowholes.
Causes of osteoporosis in several situations:
1. Melt overheating. 2. Melt the gas content is too high. 3 casting temperature is too low. 4. Ling but little strength. Casting too fast. 5. funnel for uneven flow. 6. The oven is not complete. Shutdown time is too long. 7. Tools and refinery gas. Solvents and other wet or incomplete. 8. High-magnesium alloy cover bad.
Stainless steel precision casting porosity and osteoporosis is one of the most common defects, stainless steel smelting and casting technology (process planning) production; all around the stoma and osteoporosis defects worked out. How to solve the pores and osteoporosis defects?
Take the following measures:
1. controlling the chemical composition of impurities (reduce non-metallic inclusions) 2 is a solid to a liquid feed material delivery delivery (shorten the melting time) 3. 4. strengthening refining degassing is the original small size to a large garden ingot Park ingot (to reduce the casting speed, change over the band size) Result avoid losses.
Pores causes:
1. furnace overhaul in the repair or drying after a long shutdown is not complete. 2. wet materials have oil. Water. 3. Poor quality lubricating oil. 4. Melt Overheating in the furnace. 5. The end of the tool dry thoroughly. 6. Gas water is too large. 7. melting too long.
Osteoporosis is generally divided into two types: one is loose between contraction, one is at the end of the removal of loose bodies dissolved gas formation. The main factors associated with the formation of a loose when the gas content of the melt and the ingot shaping excessive belt size. Shape and structure.
From the above case, although the whole event has in the past thirty years, but for us to explore and develop aluminum provides very valuable data and reference.
Summary:
1. Strengthening control component impurities, effectively reducing the increase of non-metallic slag material. 2. The use of liquid feed, reducing the residence time of the metal in the melting furnace, furnace gas dissolved in unsaturated role to be released and decomposition. 3. Stainless steel casting temperature use limit. 4. Reduce the casting speed changes Sump transitional structure, so that there is enough residual gas floating space. 5. The effective degassing refining. 6. casting technology development is not static, in exceptional circumstances, decisive use plan, to prevent the occurrence of product quality defects. http://www.cnwxyszj.com China Precision Casting Silica Sol precision casting stainless steel casting |
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