Brass is made of copper and zinc alloy consisting of. If only by copper, zinc, brass is known as ordinary composed of brass. If by two more elements of the many kinds of alloy is called special brass. If by lead and tin, manganese, nickel, iron, lead, silicon composed of copper alloys. Brass has the strong abrasion. Special brass and call special brass, its strength and hardness, strong corrosive. And machining of mechanical properties is also prominent. By brass drawn into a seamless copper, soft and abrasion resistance. Brass seamless tube can be used in heat exchanger and condenser, low temperature pipe, underwater transportation pipe. Manufacturing sheet, strip material, rods, tubes, casting parts, etc. Contain copper in 62% ~ 68%, plastic, strong manufacturing compression equipment, etc.Because we don't know the ancients with what method to the constitution or rhombohedrons smelting, melting of ancient use brass is not too clear. The boiling point of lower than copper zinc, brass in heating, charcoal will heating smelting, it is hard to make zinc evaporate. The Romans were the first large-scale may use this method, but smelting bronze's builders may have previously been unintentionally produced brass, because tin and zinc distinction, original is unclear. We should pay attention to, the bible mentions of brass, were actually bronze, The Roman COINS, called cry, also be to use copper or bronze casting, not in a yellow cast-bronze. Made things complicated is, they do have use brass to COINS, but at first than copper brass or bronze are more expensive.However, since the middle ages, in its not used to make POTS and pans, before brass is a luxury, only use to do memorable tombstone such things.From about A.D. 1230 starting in brass products in Europe popular about 300 years, because they are more than large sculptures much cheaper. Die 1231 years will prachanda archbishop of the bronze, is known to be made of the earliest with brass statues. Casting brass products process is this: first crushed with copper smelting and charcoal piece mixing heat, the zinc and copper unifies in together, and heating makes alloy melt, and then put into the liquid copper moulds. Britain's oldest yellow vessels are imported, mainly from tuor imported within. The trustor may order from tuor inside is packed in the beautiful bottom or a marble pedestal of complete tombstone. Made of copper tombstone method is to first cast bronze casting, must usually good good around the tent of silhouette, again pick put it precast slab, use the knife in bronze statue carved out of detail. Sometimes the statue's hands and face to use alabaster or other inlay material. Bronze safety done, with packed in lead in the dark pin fixation bolt in stone base. Put a layer of asphalt statues itself. Big bronze casting, then is piecewise jointing up.

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