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Raw material selection smelting of tin phosphor bronze

2020-10-21 H:25:09
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Tin phosphor bronze is a kind of alloy copper, which has excellent electrical conductivity is easy to get hot. Its socket yellow chip hard wired electrical equipment structure has no rivet connection friction contact point, which can ensure good touch, good elasticity stable insertion. Tin phosphor bronze has higher corrosion resistance, wear resistance no flame when it breaks through. It is used for rolling bearing with high speed, medium speed heavy load. The working temperature is 250 ℃. It has the features of full-automatic self-aligning, insensitive to inclination, symmetrical bearing capacity, high bearing capacity, additional axial load, no maintenance of self-lubricating bearing, etc.

The crystal temperature range of Sn-P bronze aluminum alloy is wide (150-160 ℃), which is easy to cause serious twin porosity. When it is serious, the surface layer may produce "shrinkage porosity tumor". Therefore, the cathode copper, tin ingot, P-Cu positive intermediate aluminum alloy used in seasoning should conform to the relevant specifications, so as to avoid as, Sb, Bi, Pb, s other hazardous elements exceeding the standard. For copper waste, attention should be paid to infiltrate into other types of waste.

Tin phosphor bronze is usually smelted in low frequency cored induction furnace insulated. During the whole process of early smelting forging, the maintenance of solution should be improved. General selection of dry charcoal chaff cover. The smelting temperature of tin phosphor bronze is about 1180 ~ 1250 ℃, the forging temperature is 1140 ~ 1180 ℃.

The results show that the surface of Qsn6.5-0.1 Sn-P bronze is fine equiaxed crystal, the inner layer is columnar crystal. In the past, the "pull stop" process was used, in which the primary crystal zone was produced during "stop" the crystal zone appeared on the inner wall of the extra continuous casting mold after the metal material was melted. There is an interface area between them, it is easy to produce the aggregation area of hydroxides, impurities, Sn rich low melting point components. In appearance, it mainly shows the transverse crystal texture on the surface of slab. This kind of crystal texture is the embodiment of the whole forging process slab quality. The excellent crystal texture has no great harm to the characteristics of the slab; the surface forging porosity of the poor forging texture is very large, it is very easy to produce regular edge cracking during cold rolling afterwards; when the "crystal texture" is significantly different, it indicates that the actual cooling effect of the continuous casting mold is uniform, it will also produce more serious forging porosity, which is usually in the leading stage of the texture There are gray solutes on one side of the wall, resulting in cracking.


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