There are many differences between steel ductile and cast iron and these differences affect the price chart directly. Many buyers are confused about the difference between gray cast iron and ductile iron (also known as ductile iron).
- Physical properties: The main difference is their physical characteristics. Ductile iron has higher tensile strength and yield stress than gray iron, and ductile iron also has higher elongation. For example, ductile iron ASTM A536 120-90-02 has a tensile strength of 900 Rm N/mm2, but the highest grade gray iron, ASTM A48 CL50, has a tensile strength of only 500 Rm N/mm2.
Ductile iron can reach an elongation of 18%, while the elongation of gray iron is very low, and the standards for gray iron materials do not even specify the elongation requirements. But gray cast iron has good wear resistance and castability. Tensile strength and elongation are very important for the application. Therefore, ductile iron will be more durable, more reliable, and harder.
- Microstructure: The microstructure of ductile iron has many graphite nodules. Gray cast iron has many graphite flakes. This different structure is the main reason for the different physical properties. Because the tips of graphite flakes concentrate more stress than graphite balls, gray cast iron has less tensile strength and elongation.
- Production process: The production of ductile iron is more complicated and difficult than that of gray iron, and ductile iron requires a modularizing agent to complete the spheroidization and inoculation process. Ductile iron will be more expensive than gray cast iron due to the complex manufacturing process and higher alloying additions. In addition, the price of ductile iron is also affected by spherical factors.
After all, ductile iron is a product, and ductile iron is just a material. So when we say ductile iron is more expensive, we really mean ductile iron is more expensive.
- Application: For the cast iron parts that do not require high tensile strength and elongation, such as many gas stove parts, boiler parts, machine bases, etc., gray cast iron will be a good choice. Lower prices will be a big reason. As for machinery castings, tractors, trucks, cars, and ductile iron castings will be more reliable. In general, ductile iron is more useful and becoming more important to the industry as a whole.
ductile iron price index
Ductile iron contains spherical free carbon, not filaments. The price of this product usually varies slightly and does not change much due to its special characteristics. For this reason, this cast iron is sometimes referred to as ductile iron in the US and ductile iron (SG) in the UK. Because of its good properties, ductile iron has had a good reputation since its discovery in 1948. If a little magnesium is added to the melt before casting, nodular graphite is obtained. The chemical composition of ductile iron is similar to that of gray cast iron, but the content of sulfur and phosphorus is less. Ductile irons have a good yield stress range and acceptable ductility, and unlike malleable irons, they can be cast to various thicknesses. It is spherical. During solidification of ductile iron, most of the carbon forms spherical graphite, as opposed to filiform graphite in gray iron. The microstructure of cast iron consists of graphite nodules surrounded by free ferrite (bull's eye structure) in a pearlitic environment. 
Since the graphite in non-brittle cast iron is spherical rather than filamentous, the properties of this cast iron are very different. On the one hand, gray cast iron has the characteristics of low melting point, good fluidity and castability, good machinability, and good wear resistance, on the other hand, it has strength, ductility, toughness, and good processability. The prices of cast iron ingots in the market are usually as follows from the highest price to the lowest price:
- Ductile iron Price
- gray cast iron price
- blast furnace cast iron (white) price
- New cast iron bar tariff
- Tariff for scrap cast iron ingots
- cast iron billet rate
ductile iron price per kg
Of course like any other steel product in the market, the price of the ductile iron and related products are calculated as per kg or per ton. cast iron is the most fluid iron alloy and can be used to produce complex and thin parts. If the chemical composition of the cast iron is in the range of gray cast iron and the solidification rate is appropriate and correct, the carbon in the cast iron will separate out during solidification and form graphite fibers. These hard-cast irons with good wear resistance have excellent machinability. The fracture of gray cast iron is charcoal gray, so it is called gray cast iron. Gray cast iron has many useful properties and is still favored by design engineers for casting with complex shapes and sizes. Today, about 75% of all castings by weight are made from gray cast iron due to cheap and simple workmanship. In this cast iron, filiform graphite produces special properties such as hardness with high wear resistance, excellent machinability, wear resistance under limited lubrication, and excellent vibration absorption. When compressive strength, dimensional stability, and accurate exposure under stress are required, gray cast iron is comparable to high-strength steel, and the amount, size, shape, and distribution of graphite or carbide are the main factors that determine the strength properties of gray cast iron. cast iron. 
Their control is very important in the production of gray cast iron. Due to changes in melting, nucleation, solidification rates, and the influence of certain elements, the graphite structure in gray cast iron can vary greatly, even slightly. Graphite can be spread in the form of coarse or fine flakes. Cast iron is a type of ferroalloy which is composed of iron, carbon and silicon. Generally speaking, cast iron is divided into the following categories based on casting and eutectic solidification:
- gray cast iron
- Ductile iron
- white cast iron
- Maribel cast iron
- graphite cast iron
One of the best properties of cast iron is wear resistance, which is why it is widely used in industry. Some uses of cast iron are listed below.
- Industrial parts machinery manufacturing industry
- make top piece
- cylinder block
- Gearbox
- make pipes
ductile iron prices
As mentioned earlier the prices of cast iron and ductile iron are different but the difference is not that huge to produce a big gap in prices. Of course, the differentiation of prices would change a lot in the bulk and mass purchases. gray cast iron: This cast iron is gray from the point of failure. Gray cast iron is the most used cast iron on the market. In this cast iron, carbon is 2 to 4 percent, silicon is 1 to 3 percent, and about 90 percent is iron. In this cast iron, the carbon is mainly deposited in the form of graphite. Types of gray cast iron
- Gray cast iron graphite flakes or flakes
- Ductile gray cast iron
- Gray ductile iron
- Bull's eye gray cast iron
The price of gray cast iron lies almost between the price of ductile iron and white cast iron. 
Ductile iron: This cast iron is also known as unbreakable cast iron. Ductile iron is characterized by a low melting point, easy casting and processing, wear resistance and high ductility. The price of ductile iron is relatively higher than that of dimensional iron. white cast iron: White cast iron, also known as blast furnace cast iron, is obtained with a high cooling rate. White cast iron is white at the broken part. The price of blast furnace cast iron is much more appropriate than other cast irons. Maribel cast iron: Malleable iron is also known as malleable iron in the market. Strength and ductility are among the characteristics of malleable cast iron. This cast iron is made of white cast iron. 
ductile iron price chart
Every professional business person working in the steel industry knows that the price chart of steel products varies when it comes to different products like ductile iron. Ductile iron is a very good product to be used in or kitchen because of the heat transfer. In the Industrial Revolution, a type of construction dominated by cast iron appeared. This is because steel is not popular and cast iron is cheap. At the time, cast iron was used because of the misconception that it was refractory. Another use of cast iron in the past was for railroad tracks, which is also obsolete. It is also wrong to use it on the railway line under the bridge. In England, new and cheap methods of making cast iron were used for the first time, and it was used in the construction of the time. 
Major uses of cast iron in the past have been in pipeline construction, manhole construction, industrial machinery, bridge construction, and all these applications before the popularity of steel. It has low fire resistance and low resistance to stretching and bending, and its available form is marketed as a bar. The chemical composition of ductile iron is similar to that of gray cast iron, but the content of sulfur and phosphorus is lower. Malleable irons have acceptable ductility and, unlike malleable irons, can be cast to various thicknesses. During the freezing process of ductile iron, most of the carbon is formed in the form of spherical graphite, in contrast to the filamentary graphite in gray cast iron. As the graphite in ductile iron is spherical rather than filamentous, the properties of this cast iron are very different, on the one hand, it has strength, ductility, and toughness. 
cast iron price chart
The price chart of every metal product is directly related to the quality of the products and the quantity they want to buy. Cast iron is one of the metal products that because of the graphite and carbon in it, has many different usages. Alloys are divided into ferrous and non-ferrous metals. Steel and cast iron form a family of ferroalloys with iron as the main component. In fact, the difference between the two is mainly related to their chemical composition. Cast iron is an alloy of iron and carbon with a carbon content between 2% and 4% and a silicon content between 1% and 3%. Cast iron is hard and brittle and easy to cast. Cast iron is actually pig iron produced when blast furnaces melt iron ore. This pig iron or cast iron is used to make steel. Also, the total cost of producing cast iron is lower than steel. In this way, cast iron sacrifices the rights of steel, so this alloy has been improved many times and its use is expanding day by day. Steel is an alloy of iron and carbon with less than 2% carbon, produced by remelting cast iron in special furnaces. They have many kinds as well that if you want the price and the details on them you can easily check our website and get the prices from our experts. 
steel price indices
There are many indices in the market for the rise of steel prices. Here are Some factors affecting steel prices: iron ore: Iron ore is the main source of steel production. It is only natural that iron ore prices affect steel prices. the oil price: Oil prices also have a positive influence on steel prices. As the price of oil increases and the cost of making steel increases, the price of steel will also increase. exchange rate: Exchange rates have a positive influence on steel prices. In Iran, some steel production necessities are imported from other countries, so their prices are affected by exchange rates. This means that if the currency market changes, the price of steel will also be affected. Like the inflammation in the steel market over the past few years, it was caused by changes in the currency market. It is also worth mentioning that although there are many reasons for determining the price of steel, most of them are illogical and false. Shipping price: Transport prices are directly related to oil prices. If the price of oil increases, the cost of transportation also increases, which will lead to an increase in the price of steel.
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