2.93.250.750.90.7-0.9 - more than 0.175 Note: 100 back to the W material ingredients in the ingredient ingredients within the range may not be ingredients, otherwise according to 100% of the new ingredients ingredients required ingredients 2 return material vacuum smelting process bookmark4 the T. Arts The equipment used is the ZG200 vacuum induction furnace, specific. 0 1st return 2nd return 1st 3rd return 4th return 1st 5th test Technical conditions 5 7 40 3.2.2 Purity Alloy purity is important for alloy properties, especially for hot and cold fatigue properties. influences. According to HB5406-88 "Standard Test Methods for Casting High-temperature Alloy Ingot Dross", scum test of new material of K424 alloy and the second, third and fourth return mother alloys were carried out, and the results of scum inspection test were measured. The cleanliness of the new material and the 4th returned material reached 22 to 24 levels, and the purity of the returned material of the 2nd and 3rd time reached 2022. The results from the fourth return of material purity indicate that the effect of improving the purity of the alloy by the improved smelting process is obvious.
3.2.3 Hot and cold fatigue properties Select different types of master alloys, remelt and cast hot and cold fatigue specimens, according to HB6660-92 "painted panels thermal fatigue test method" to produce qualified specimens, and then in 1 The crack length of the V-notch tip was measured 50 times under the cup test.
The average crack lengths of the two types of master alloys of each type were compared and the results are shown in Table 5. From Table 5, the average length of hot and cold fatigue cracks gradually increased with the number of return times, and cracks of the third return material were observed. The length is close to 1 times that of the new material, and the increase in the average crack length is in obvious correspondence with the increase in the gas content. The fourth return material and the fifth experiment improved the smelting process, and the oxygen and nitrogen contents were slightly better than those of the secondary return material. The cold and hot fatigue cracks were also slightly better than the secondary return material.
Table SK424 Different types of master alloys Cold and thermal fatigue test results Table5 Thecoolandhotfatigue master alloy type No. of crack length/mm Average crack length/mm Oxygen content (ppm) Nitrogen content (ppm) 410 New material 80% return material + 20% new material 1st return 2nd return 3rd return 4th return 5th trial Russian anatomical part 4 Conclusion The chemical composition and mechanical properties of the K424 new material and the return mother alloy developed in the vacuum smelting process meet the requirements of the Russian standard OCT190126-85; The room-temperature tensile, plastic and high-temperature permanent properties of the back-feed mother alloy are almost the same as those of the new material; the effect of improving the purity of the alloy by the improved smelting process is obvious.
In addition to high-preservation and purification of the second, DFC-500-type cleaning agent. Mainly used for non-ferrous metal (copper, tricks) j high-efficiency slag insulation, slag removal rate 〗 〖%, insulation min above. Avoid copper!
The purity of liquid and aluminum liquids is not enough to improve the product quality. | Three, DFC-600 type riser heat insulation agent. It is recognized by the foundry industry that j improves the quality of cast iron, iron, copper, and aluminum feeders. This product covers the *1 condensing and heating of the riser and prolongs the solidification time of the riser by 45f. 'It does not affect!
The amount of the original metal. \The purifier produced by our factory can send 2kg free of charge to the new user to try it first, and then confirm the contract and deliver the goods after confirmation. Laugh* Harbin Jinlan Cleaner Factory is specialized in producing castings with high efficiency: cleaning agent manufacturers.
1 product. Since its launch, it has been used by a number of foundries, Jinjing brand cleaners, and a DFC-400 type cleaner. Mainly used for cast steel, gray iron, ductile iron, etc. The slag removal rate is 100% and the temperature is kept for more than 10 minutes. The product: no pollution of the metal infiltration, can slow down the occurrence of magnesium escape and backflow phenomenon, j can eliminate the inoculant on the iron and gray iron melting endless particles, to avoid the casting table address: Hulan County, Heilongjiang Province Kang Jinzhen Jiefang Street
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