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Tin is a silver-white metal with a melting point of 231.9℃. Tin has excellent plasticity. The ductility of tin is second only to gold, silver, and copper, and can be calendered into tin foil up to 0.04mm. But tin has very low strength and hardness and cannot be used as a structural material.
Tin ingot, as a metallurgical charge, can be combined with other metals to make high-quality alloys. Bronze is a copper-tin alloy, which was widely used in life and production as early as BC. Fusible alloys generally contain tin.
Grade | Sn99.90 | Sn99.95 | Sn99.99 | ||
Composition/% | Sn(≥ ) | 99.90 | 99.95 | 99.99 | |
Impurity(≤) | As | 0.008 | 0.003 | 0.0005 | |
Fe | 0.007 | 0.004 | 0.0025 | ||
Cu | 0.008 | 0.004 | 0.0005 | ||
Pb | 0.040 | 0.010 | 0.0035 | ||
Bi | 0.015 | 0.006 | 0.0025 | ||
Sb | 0.020 | 0.014 | 0.002 | ||
Cd | 0.0008 | 0.0005 | 0.0003 | ||
Zn | 0.001 | 0.0008 | 0.0005 | ||
Al | 0.001 | 0.0008 | 0.0005 | ||
Total | 0.10 | 0.50 | 0.010 | ||
Tin ingots are commercial tin cast into ingots, partially refined, but also containing a small amount of different impurities (such as copper, lead, iron or arsenic), which is a solid tin different from tin plates. It can be used as a coating material and has a wide range of applications in food, machinery, electrical appliances, automotive, aerospace and other industrial sectors.
Using high-quality tin concentrate as raw material, high-purity tin ingots are produced by pretreatment reduction smelting electric furnace smelting body electrolytic refining process. The raw materials are subjected to magnetic separation, rotary kiln roasting and other refining pretreatment, as well as quartz, limestone, coke, etc. The crude tin is refined into the furnace according to a certain proportion, and then "sulfuric acid-a kind of cresyl stannous sulfate" is used as the medium to electrolyze to produce high-purity tin ingots. The production process after the liquefaction furnace and the return to the furnace are concentrated in the smelting process of electric furnace crude tin and electric furnace slag.
Silver - white metal, soft quality, good ductility. Melting point 232℃, density 7.29g/cm3. non-toxic.
Tin is a silvery, soft metal, similar to lead and zinc, but it looks brighter. It has a low hardness and you can cut it with a knife. It has good ductility, especially at 100 ° C, can develop into extremely thin tin foil, thickness can be as thin as 0.04 mm.
Tin is also a low-melting metal, with a melting point of only 232 ° C, so it can be melted by a candle flame into a liquid as liquid as mercury.
Pure tin has a peculiar property: when the tin rods and plates are bent, they make a peculiar bursting sound that sounds like crying. The sound is caused by friction between the crystals. This friction occurs when the crystal deforms. The strange thing is, if you change the tin alloy, when it is deformed, it does not make such a cry. Therefore, people often according to tin this characteristic to identify a metal is not tin.
