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What are Malleable Pipe Fittings
It is obtained by tempering white iron at high temperature and is often used to make pipe parts, such as various pipe joints. The main applications of malleable iron fittings include heating systems, fire protection systems, etc. The existence of malleable pipe fittings has certain advantages, for example, its mechanical properties are relatively good, and it has high toughness. In terms of strength, hardness and wear resistance, it has good performance, so malleable pipe fittings have a wide range of applications, and it is also a promising building material.
The malleable pipe fittings are connected with the pipeline by thread to ensure good contact and connection with the pipeline. The pressure bearing capacity of this kind of pipe fittings does not exceed 1.6MP. Do not use it under particularly high pressure to prevent some abnormal events. The malleable pipe fittings and pipes are connected together by standardized threads, which saves time and effort in the construction process, and also saves a lot of labor and costs.
Types of Malleable Pipe Fittings
Before introducing the specific application fields of malleable pipe fittings, it is necessary for us to give a brief introduction to the types of malleable pipe fittings produced by Jianzhi Group. Only by understanding the most basic knowledge about the types of pipe fittings can we more clearly understand why different fields use different types of malleable pipe fittings.
At present, Jianzhi Group's galvanized malleable fittings are divided into three series according to their product design standards: heavy banded, medium beaded, and beaded. According to the different galvanizing methods, it can also be divided into three different types of pipe fittings: hot-dip galvanizing, electro-galvanizing, and black products. Therefore, we can provide customers with 9 different choices for the same type of product.
Get different information about malleable iron pipe
Products that fully comply with the China national standard GB/T -. The working temperature of the product is 200 degrees Celsius, and the working pressure is 1.6Mpa. Tensile strength>330Mpa, elongation>8%, hardness <150HB.
Heavy banded products specifications
Products that meet the standards of construction and support enterprises. Its working strength standard fully meets the national standard, but in order to save costs, it is made smaller in size and thinner in wall thickness. In the production process of malleable, it is very difficult to make the product thinner under the condition of ensuring the use standard. It is prone to through-hole phenomenon, and its strength and plasticity are also difficult to guarantee. Under the premise of ensuring the use of standard products, medium beaded products have successfully reduced product costs and provided customers with more competitive price options.
Medium beaded products specifications
In order to meet the price demand of lower-end customers, Jianzhi Group has developed a series of beaded products. Like the Heavy banded products, the beaded products can fully meet the use strength required by the national standard. At the same time, due to the low requirements of the mold design and filling capacity of the beaded products, the mold release is easy, which further reduces its manufacturing cost.
After the zinc ingot is dissolved by heating, a layer of zinc film is attached to the surface of the product through the hot-dip process. Through the isolation of the zinc layer, the product is protected from oxidation and rust is prevented. The advantage is that the coating is thick, the thickness of the inner and outer walls is uniform.
Hot dip galvanized pipe fittings
The product is passed through the electrolytic zinc solution, and the zinc ions are attached to the surface of the product under the action of the electrode to form a coating. The advantages are that the coating is uniform, the surface is smooth and beautiful, and the cost is low. The disadvantage is that the thickness of the coating is thin, and the coating on the inner surface is thin due to the magnetic effect of the electrodes. The product can be used in oil systems with low requirements for anti-oxidative corrosion.
It is difficult to distinguish the difference between hot-dip galvanizing and cold-dip galvanizing in appearance. You can use a professional instrument to measure the thickness of the zinc layer, or use a magnifying glass to view the surface texture to distinguish.
This kind of pipe fitting is a malleable iron fitting without galvanizing process, and other processing steps are the same as the above two.
Contact us to discuss your requirements of galvanized steel fittings. Our experienced sales team can help you identify the options that best suit your needs.
black pipe fittings
Application areas
In the pipeline system of water supply and drainage, there are high requirements for the anti-rust ability of the pipeline, so galvanized pipe fittings are generally selected. In particular, hot-dip galvanized pipe fittings have thicker galvanized layers, stronger rust resistance and more corrosion resistance. In fact, not only in the field of water supply and drainage, hot-dip galvanized pipe fittings should be used in any use environment that requires high anti-corrosion ability. Regarding the choice of heavy banded, medium beaded, and beaded, you should consider your budget and local national standards or building standards for comprehensive consideration, but if you have higher requirements for safety in use, it is recommended that you purchase higher Standard fittings.
In the oil system, because the oil itself has the effect of preventing the rust of the pipe fittings, non-galvanized pipe fittings are generally selected. But there is a problem that when the pipe is transporting oil, it is difficult for the inner wall of the pipe to rust because it is in contact with the oil, but the key outer wall still has the possibility of rusting and aging. Spray paint treatment to enhance the corrosion resistance of the outer surface of the pipe fittings. In addition, because the non-galvanized black pipe fittings directly expose the metal primary color of malleable cast iron and shine with a unique metallic texture, many black pipe fittings are used to make handicrafts. On the one hand, the color and texture of the black pipe fittings are very beautiful, and on the other hand, they can also be sprayed with different colors of paint on their surfaces to make all kinds of beautiful handicrafts.
Gas transmission is an important application field of malleable iron fittings. Due to the corrosive nature of natural gas, galvanized pipe fittings are selected without exception for the malleable pipe fittings that transport natural gas. Moreover, the safety requirements of natural gas pipelines are very high, so the selection of pipe fittings will require the highest standards, that is, heavy banded pipe fittings. Here I would like to remind you that the selection of pipe fittings must be combined with the specific application field. Improper selection may cause serious safety problems. In fields with high safety requirements, high-standard pipe fittings must be selected.
pipe fittings for gas delivery system
Of course, there are many application fields of pipe fittings, and it is difficult to list them all. I hope the explanation in this article will help you.
Here, it is recommended that you pay attention to the malleable pipe fittings produced by Jianzhi Group. Jianzhi Group is a professional manufacturer of malleable pipe fittings in China. And the annual production capacity reaches more than 400,000 tons, with absolutely sufficient supply capacity. The three series of malleable pipe fittings and different galvanizing methods mentioned in this article are combined with a total of 9 types of products. Jianzhi Group can provide them. Welcome to pay attention.
People know us for our plastic products (hint: it's in our name), but we are fans of everything to do with piping. Metal pipe, fittings, valves, and filters are no exception! This blog post is titled "Malleable vs. Ductile Iron" and will lay out a comparison between malleable and ductile iron.
You may be thinking, "If they're both iron, they should behave basically the same, right?" That's a great question, but the answer is no. These are two iron alloys with different chemical compositions, so you cannot always use them interchangeably. First, we will look into the history of these materials. Then we will lay out the physical properties of each material. Finally, we will investigate common applications for each material.
Humans have been manipulating iron to build things for centuries, maybe even millennia. However, most improvements to iron are somewhat modern. Until recently, the strongest types iron were "gray" and "white" cast iron. To make cast iron equipment, molten iron was molded in a cast. They had to do this because hammering cast iron breaks it. Gray and white iron were structurally sound, but cracked if bent or expanded.
Malleable iron was the first iteration that could be hammered and bent into shape. This made it much easier to work with and less likely to fail. In , however, ductile iron was developed. The difference between malleable and ductile iron was toted to be strength. This would allow ductile iron to be more easily bent and manipulated without breaking. So which material is actually better? Let's list their physical properties.
To compare these two materials, we will examine how well pipe fittings made of each hold up to pressure and temperature. For fittings, this is there they start expanding enough to leak, not where they physically break. These maximum pressures are for when fittings are at optimal temperatures. We will begin by looking at malleable iron fittings.
These are just two measurements for temperature and pressure tolerance by two companies. There are no set temperature or pressure tolerances that are always true for the materials, but these measurements were chosen to give a good idea that, when it comes to pressure and temperature, these two materials are fairly similar. Due to the innovations used in the manufacture of ductile iron, it is slightly less expensive and more malleable, which are helpful qualities for larger, more expensive projects.
Malleable iron is often used for small parts due to its excellent tensile strength. This includes electrical fittings, hand tools, pipe fittings, washers, brackets, fence fittings, power line hardware, farm equipment, and more. Companies around the world make fittings and other such equipment out of malleable iron, which is a testament to how well it still works 70+ years after the advent of ductile iron.
Ductile iron is used for much of the same type of items as ductile iron, as it is also very strong and workable (or ductile). The uses for ductile iron include pipe fittings, industrial piping, liquid fittings, strainers, and more. As mentioned before, ductile iron is cheaper to produce. Large ticket items, such as industrial strainers and valves, are regularly constructed out of ductile iron for this reason.
After doing the research and reading the facts, we have concluded that, while malleable iron is capable of great things, ductile iron is the superior alloy. Malleable iron typically has some internal flaws stemming from irregularly-shaped carbon particles. This makes cracking a possibility. Ductile iron has spherical carbon particles that allow for more bending.
Aside from the structural advantages of ductile iron, it is also easier and cheaper to construct. Malleable iron considerably shrinks when solidifying, but ductile iron does not. This means that ductile does not require as many specialized workers or equipment to mold as its predecessor. Unless your application is severe, you probably would not even notice the difference between these products
Ductile iron wins in this comparison, but malleable iron is still a great material used for fittings and other equipment to this day. We even carry a very popular line of black malleable iron fittings for gas lines.
*These measurements are from Crane's Malleable Fitting Page.
**These measurements are from Shurjoint's "Ductile Iron Threaded Fittings" catalogue.