Use of ductile iron:

1: pressure pipes and fittings

At the beginning of ductile iron's use for piping, iron piping and fittings were mostly produced in the major industrial countries and were manufactured, designed and used in accordance with both national and international standards and codes of practice (I502531). Ductile iron pipes have long proved superior to gray iron pipes for the transport of water and other liquids. The main reason for this transformation is the combination of strength and toughness of ferritic nodular iron, which enables pipes made of this material to withstand high operating pressures and be easily loaded and loaded when laid. Mat gas transmission pipeline must be able to withstand the requirements of the use of more than one, that is, to withstand the excavation and municipal engineering construction near the pipeline and transportation, where the high strength, high shear and simple installation and connection process of ductile iron pipeline has proved that the selection of this material is decisive.

2: Automotive applications

The automobile industry is the second largest user of ductile iron castings in terms of tonnage produced. Ductile iron is used in three main places in automobiles: (1) power source an engine component; (2) Power transmission - gear train, gear and shaft sleeve; (3) Vehicle suspension, brake and steering device. The power source crankshaft is a part that is subjected to continuously varying bending, torsional, and shear loads and is cycled a billion times over its lifetime. Automotive design engineers considered the possibility of ductile iron as early as 19152, four years after discovering the method of treating it with magnesium. Almost all crankshafts of the Ford Motor Company are made of this material. Most gasoline cars in the world have a ductile iron crankshaft instead of a forged steel crankshaft, and this application is considered a classic example of value engineering.

Automobile diesel engine makers from extend the service life of the engine, carefully consider the crankshaft materials choose express in particular, when high strength bainite isothermal strain fireball iron in order to improve the dynamic weight ratio, the expansion of the turbocharger USES affected materials according to the design, equipped with turbocharger exhaust temperature increased to 500 - a - 70. C) Under these conditions, oxidation and creep strength become important. Ductile iron with excellent properties is being used in the exhaust pipe instead of gray cast iron. With the increase of temperature, silicon aluminum alloy ductile iron will be further used.

Automotive power transmission malleable iron parts are sometimes used as vehicle transmission parts, ductile iron is applied to disc clutches, splitters box, rear axle and wheel housing, and there is a strong trend. The G.Foiseher Foundry in Sehaffhausen, Switzerland, has many applications in this regard, working closely with designers to convert cast, forged and malleable iron parts into nodular cast iron parts. Nowadays, iron is often used for mounting parts such as spring hooks as well as the main safety parts of brake systems (brake calipers) and steering joints.

3. Agricultural, road and building applications

Modern economic agricultural methods require agricultural machinery that is reliable in the required state and has a long service life. Ductile iron castings widely used throughout the agricultural industry include various tractor fittings, plough birch, brackets, clamps and pulleys. Typical components are the two rear axle housings of agricultural vehicles, which were originally made of cast steel. The road laying and construction industries require a considerable amount of equipment of all kinds, including bulldozers, punchers, cranes and compressors, in which ductile iron castings are used.

4: General application

The ductile iron machine tool industry takes advantage of the engineering properties of ductile iron, which allows the design of complex machine tool parts as well as castings in excess of 10 weights. Tons of heavy machine castings. Applications include injection molding, forging press cylinders and pistons. Ductile iron has high tensile strength and yield strength, and good machinability, allowing the production of lighter castings while keeping them rigid. Likewise, ductile iron's strength and toughness make it an ideal material for a variety of hand tools, such as wrenches, clamps and measuring tools.

The high strength and high modulus of elasticity of ductile iron are utilized in the paper making industry. For example, compared with gray cast iron, ductile iron has 60% higher modulus of elasticity, which can reduce weight when designing pressure drums and drying drums. Similarly, nodular iron (with appropriate Ni-occluded alloy) rolls used in steel mills have higher properties than steel and chilled cast iron.

5: valve manufacturing

Valve manufacturers are major users of ductile iron, including austenitic ductile iron, whose applications include the successful delivery of a wide range of acids, salts and alkaline liquids.