麻豆人妻无码性色AV专区,亚洲AV极品无码专区在线观看,18禁美女黄网站色大片在线,秋霞无码久久久精品,宅男噜噜噜66网站在线观看,真人无码作爱免费视频网站,中国亚州女人69内射少妇,丝袜美腿亚洲一区二区,少妇高潮无套内谢麻豆传,国产精品无码AV片在线观看播

<center id="ojlzu"></center>
<rt id="ojlzu"></rt>
    <rt id="ojlzu"></rt>
  1. <rt id="ojlzu"></rt>
      1. Wuxi Gotele Metal Products Co., Ltd : CN EN
        Home >>News >>News of Metal Industry

        Brief Introduction of Metal Brass

        Brass is a copper alloy with zinc as the main additive element. It has a beautiful yellow color and is collectively called brass. Copper-zinc binary alloy is called ordinary brass or simple brass. The brass above three yuan is called special brass or complex brass. For alpha brass, both_b and_increase with the increase of zinc content. For (alpha+beta) brass, the room temperature strength increases continuously when the zinc content increases to about 45%. If the zinc content is further increased, the strength of the alloy decreases sharply due to the appearance of more brittle R phase (solid solution based on Cu5Zn8 compound). The room temperature plasticity of brass decreases with the increase of zinc content. Therefore, copper-zinc alloys containing more than 45% zinc have no practical value. Brass alloys containing less than 36% zinc are composed of solid solution and have good cold working properties. For example, brass containing 30% zinc is often used to make cartridge case, commonly known as cartridge case brass or 73 brass. Brass alloys with zinc content ranging from 36% to 42% consist of solid solutions, of which 64 brass with zinc content of 40% is the most commonly used.


        Ordinary brass is widely used in water tank belts, water supply and drainage pipes, medals, bellows, serpentine pipes, condensation pipes, cartridge shells and various complex shaped stamping products, hardware and so on. With the increase of zinc content from H63 to H59, they can well withstand thermal processing, mostly used in various parts of machinery and electrical appliances, stamping parts and musical instruments. Brass castings are often used to make valves and pipe fittings.


        In order to improve the corrosion resistance, strength, hardness and machinability of brass, a small amount of tin, aluminium, manganese, iron, silicon, nickel, lead and other elements (1%~2%, 3%~4%, 5%~6%) are added to the copper-zinc alloy to form ternary, quaternary or even quinary alloys. Miscellaneous brass, also known as special brass.


        Aluminum brass: Aluminum can improve the strength, hardness and corrosion resistance of brass, but reduce the plasticity. It is suitable for marine condenser tubes and other corrosion resistant parts.




        Tin brass: Tin can improve the strength of brass and corrosion resistance to sea water, so it is called naval brass, used as ship thermal equipment and propeller. It can dissolve into copper-based solid solution and play a solid solution strengthening role. However, with the increase of tin content, brittle R phase (CuZnSn compound) appears in the alloy, which is not conducive to the plastic deformation of the alloy. Therefore, tin content of tin brass is generally in the range of 0.5% to 1.5%. The commonly used tin brass are HSn70-1, HSn62-1, HSn60-1, etc. The former is an alpha alloy with high plasticity and can be processed under cold and hot pressure. The latter two kinds of alloys have (alpha+beta) two-phase structure, and a small amount of R phase often occurs. The plasticity of the latter two kinds of alloys is not high at room temperature and can only be deformed in hot state.


        Lead brass: Lead can improve the cutting performance of brass. This free-cutting brass is often used as clock parts. Lead is actually insoluble in brass and distributed on grain boundaries as free particles. Lead brass has two kinds according to its structure: alpha and (alpha+beta). Alpha-lead brass can only be cold-deformed or hot-extruded because of the harmful effect of lead and its low plasticity at high temperature. (a + beta) lead brass has good plasticity at high temperature and can be forged.


        Manganese brass: Manganese has a higher solubility in solid brass. The addition of 1%~4% manganese in brass can significantly improve the strength and corrosion resistance of the alloy without reducing its plasticity. 

        Manganese brass has (alpha+beta) structure and HMn58-2 is commonly used. The processing performance of manganese brass under cold and hot conditions is quite good.


        Iron brass: Iron can improve the mechanical and technological properties of the alloy. Iron content in iron brass is usually less than 1.5%. Its structure is (alpha+beta). It has high strength and toughness, good plasticity at high temperature and deformation at cold state. The commonly used brand is Hfe59-1-1.


        Nickel brass: Nickel can significantly improve the corrosion resistance of brass in the atmosphere and sea water. Nickel can also increase the recrystallization temperature of brass and promote the formation of finer grains. Nickel and copper can form continuous solid solution, which enlarges the alpha phase region significantly. HNi65-5 nickel brass has single-phase alpha structure, good plasticity at room temperature and deformation under hot state. However, the content of impurity lead must be strictly controlled, and the hot working performance of the alloy will be seriously deteriorated.


        HomeTelProductsContact
        CN EN
        日本在线免费精品视频| 国产av不卡一区二区| 亚洲综合色噜噜狠狠网站超清| 亚洲一久久久久久久久| 亚洲自拍偷拍蜜桃视频| 国产精品熟女亚洲av| 小sao货夹得真紧好爽视频麻豆| av永久天堂一区二区三区蜜桃| 亚洲av国产日韩一区| 日本在线观看一区不卡| 毛片av中文字幕一区二区| 中文字幕国产精品资源| 日日av一区二区三区| 亚洲欧美日韩卡通在线| 一区二区三区日本高清| 熟女体下毛萌萌黑森林| 亚洲欧美日本韩国| 亚洲一区二区中文字幕| 国产免费中文字幕一区| 亚洲自拍日韩视频一区| 热热热热国产黄色av| 99精品众筹模特自拍视频| 蜜臀探花av在线播放| 国产一区二区三区视频免费在线 | 尤物视频网站免费在线看| 五月婷婷激情六月开心| 亚洲精品熟女一区二区| 乱码一区二区三区在线视频| av中文字幕乱码人妻| 国产欧美一区二区三区在线播放| 国内精品一区二区三区| 99午夜福利一区二区| 日韩乱色精品一区二区| 免费中文字幕一区二区| 久久久久久国产精品无码超碰| 色哟哟哟一区二区三区在线播放| 日韩成人av一区二区| 亚洲国产一区二区三区在线视频| 国产av一区二区精品| 国产色诱视频在线观看| 精品人妻码一区二区三区|