球墨鑄鐵是碳以球形石墨的形態存在，其機械性能遠勝于灰口鐵而接近于鋼，它具有優良的鑄造、切削加工和耐磨性能，有一定的彈性，廣泛用于制造曲軸、齒輪、活塞等高級鑄件以及多種機械零件。
For ductile iron with ferrite type, toughness and plasticity are high. At low temperature, toughness changes to brittleness, but low temperature impact value is higher, and has certain resistance to temperature acute change and corrosion resistance. It is widely used in agricultural machinery, such as plough, plough column, differential case, etc. It is also used as valve body, high and low pressure cylinder in general machinery, steel cap of transmission line, etc.
Ductile iron is a kind of carbon which exists in the form of spherical graphite. Its mechanical properties are much better than gray iron and close to steel. It has excellent casting, cutting and wear resistance. It has certain elasticity and is widely used in manufacturing high-grade castings such as crankshafts, gears, pistons and many kinds of mechanical parts.
球墨法蘭橡膠接頭優點：
1、體積小、重量輕、彈性好、安裝維修方便。
2、安裝后可吸收管道震動產生的橫向、軸向、角向位移；不受管道不同心，法蘭不平行的限制。
3、安裝后可降低管道水泵等震動產生的噪音，吸振能力強。
4、內無縫高壓橡膠接頭，在耐高溫、耐酸堿、耐油的管道中更有效地防止了腐蝕性介質對橡膠接頭內壁的侵蝕，提高了使用壽命。
5、具有良好的綜合性能，所以它廣泛用于化工、建筑、給水、排水、石油、輕重工業、冷凍、衛生、水暖、消防、電力等基礎工程。
6、根據材料不同可制成耐酸、耐堿、耐腐蝕、耐油、耐高溫、耐輻射、耐磨、耐老化等各個品種，適應多種介質和環境。
The advantages of the rubber flange joint are:
1, small volume, light weight, good elasticity, easy installation and maintenance.
2. After installation, it can absorb transverse, axial and angular displacement caused by pipeline vibration; it is not restricted by pipeline dislocation and flange non-parallel.
3, after installation, it can reduce the vibration and noise generated by pipes and pumps.
4. The inner seamless high pressure rubber joint can effectively prevent the corrosion of corrosive medium to the inner wall of the rubber joint in the pipeline with high temperature resistance, acid and alkali resistance and oil resistance, and improve the service life.
5. It has good comprehensive performance, so it is widely used in chemical industry, construction, water supply, drainage, petroleum, light and heavy industries, refrigeration, sanitation, water heating, fire protection, electricity and other basic projects.
6. According to the different materials can be made into acid-resistant, alkali-resistant, corrosion-resistant, oil-resistant, high temperature-resistant, radiation-resistant, wear-resistant, aging-resistant and other varieties, adapt to a variety of media and environment.
