Craftsmanship Of Wrought Iron Doors
Pig iron generally refers to alloys with a carbon content of 2 to 4.3% iron. Also called cast iron. In addition to carbon, pig iron also contains silicon, manganese and a small amount of sulfur, phosphorus, etc., which can be cast but not forged. According to the different forms of carbon in pig iron, it can be divided into steel-making pig iron, casting pig iron and ductile iron. The carbon in steelmaking pig iron mainly exists in the form of iron carbide, and its cross section is white, which is usually called white iron.
This kind of pig iron is hard and brittle, and is generally used as a raw material for steelmaking. The carbon in the cast iron of the cast iron guardrail exists in the form of flake graphite and the fracture is gray, which is usually called gray iron. Because graphite is soft and has lubricating effect, cast iron has good cutting, wear resistance and casting properties. However, its bit resistance strength is not enough, so it cannot be forged and rolled, and can only be used to manufacture various castings, such as casting various machine tool bed bases, iron pipes, etc.
The carbon in ductile iron exists in the form of spherical graphite, and its mechanical properties are far better than those of gray iron and close to steel. It has excellent casting, machining and wear resistance, and has a certain elasticity. Advanced castings such as pistons and various mechanical parts. In addition, there are pig irons containing silicon, manganese, nickel or other elements that are particularly high, called alloy pig iron, such as ferrosilicon, ferromanganese, etc., which are often used as raw materials for steelmaking. Adding some alloy pig iron during steelmaking can improve the properties of steel.
Generally, the carbon content less than 0.2% is called wrought iron or pure iron. The content of more than 1.7% is called pig iron. Wrought iron is soft, with a content of 0.2-1.7% called steel. Good plasticity, easy to deform, low strength and hardness, not widely used; pig iron contains a lot of carbon, hard and brittle, and has almost no plasticity.
Generally speaking, "iron" is divided into "pig iron" and "wrought iron". Including "steel", it is an alloy mainly composed of iron (Fe and carbon (C). Generally, the carbon content is less than 0.2%. It is called wrought iron or pure iron. The content of more than 1.7% is called pig iron. The wrought iron is soft, and the content of 0.2-1.7% is called steel. It has good plasticity, easy deformation, low strength and hardness, and is not widely used; pig iron contains a lot of carbon , hard and brittle, with almost no plasticity.
The product obtained by direct reduction with charcoal is a spongy solid block containing a large number of non-metallic inclusions. Compared with pig iron, block iron making has the following disadvantages: First, it cannot flow out of the furnace. When iron blocks are taken out, the furnace will be damaged at different levels, and continuous production cannot be performed. The productivity is relatively low and the output is relatively small. Second, forming is labor-intensive and time-consuming. The third is that there are many non-metallic inclusions, which can only be eliminated by repeated forging. Fourth, the carbon content is often relatively low, so it is very soft. The smelting temperature of pig iron is 1,150 to 1,300 degrees Celsius. The released product is in liquid state, which can be continuously produced and can be cast and formed. The non-metallic inclusions are relatively small, the texture is relatively hard, and the smelting and forming rate is relatively high, so the output and quality are greatly improved.
From block iron making to pig iron is a leap in the history of iron making technology. The wrought iron smelted by early humans is usually called block iron. Less than 0.2% iron carbon alloy. Pig iron is obtained after the mined iron ore is smelted in a blast furnace. Pig iron can be divided into steel-making pig iron and casting pig iron according to different smelting processes and uses. The difference between pig iron and wrought iron is mainly the carbon content. The carbon content of pig iron exceeds 1.7%, and the carbon content of wrought iron is below 0.2%.
We are a professional manufacturer of Wrought Iron Doors, support different Custom Garden Gates, and also sell Wrought Iron Fences. You can choose Customized Iron Fence according to your needs. There is always an Iron Furniture for you.
2022 04/27