Malleable iron fittings, whose full name in Chinese is 可锻铸铁管件, are key components widely used in piping systems. “Malleable” is a transliteration of the English term “Malleable Cast Iron,” accurately summarizing its core material characteristics—good toughness and ductility. It is not made directly from ordinary cast iron but instead employs a special process: first, molten iron is cast into a white cast iron blank, and then it undergoes a long high-temperature annealing treatment. This process decomposes the brittle and hard carbides within the material, forming a nodular graphite structure, which greatly enhances its mechanical properties and overcomes the brittleness and fragility issues of ordinary cast iron.
Malleable iron fittings primarily possess the following outstanding characteristics:1. High strength and good pressure resistance: Their mechanical strength is significantly higher than that of plastic or ordinary gray cast iron fittings, allowing them to reliably withstand the pressures in medium to high-pressure pipeline systems, which is why they are often used in critical pressure-bearing areas.2. Excellent toughness: They have good vibration and impact resistance, making them less prone to sudden fracture during installation or when subjected to external forces, thus ensuring greater safety.3. Precision threading: Typically, they are machined with high-precision tapered pipe threads (such as BSPT, NPT), which ensures reliable sealing and strong connections.4. High cost-effectiveness: Among metal fittings, their price falls between that of plastic and stainless steel/copper fittings, offering excellent durability and economic benefits.
To prevent rusting, the surface of most malleable iron fittings undergoes hot-dip galvanization treatment, presenting a common silvery-white appearance. The main types include elbows, tees, pipe clamps, unions, and pipe caps, used to change the direction of pipelines, branch out, connect, and seal. Because of this, malleable iron fittings have become indispensable basic components in fields such as construction drainage, fire sprinklers, gas transmission, heating systems, and industrial pipelines, ensuring the safe operation of various pipeline systems with their sturdy, durable, and reliable performance.
Post time: Sep-22-2025