Pig iron is an iron-carbon alloy containing 2.11%-6.67% of carbon and containing a large amount of non-ferrous impurities. When iron contains C in the range of 0.03%-1.2%, it is steel, and C1.2%-2.5% iron lacks practicality, and is generally not industrially produced. The impurity elements of pig iron are mainly silicon, sulfur, manganese, phosphorus and the like. The pig iron is hard and brittle, lacks toughness, and has almost no plastic deformation ability, so it cannot be formed by forging, rolling, drawing, and the like. However, the high silicon-containing pig iron (grey iron) has good casting and cutting performance.
Pig iron is a blast furnace product, which can be divided into two categories: steelmaking pig iron and foundry pig iron according to its use. It is customary to refer to steelmaking pig iron as pig iron and the foundry pig iron to cast iron. Casting pig iron can change its internal structure by means of forging, metamorphism, spheroidization, etc., and improve its mechanical properties. Therefore, foundry pig iron can be divided into white cast iron, gray cast iron, malleable cast iron, ductile iron and special cast iron. .
Pig iron can also be divided into ordinary pig iron and alloy pig iron. The former includes steelmaking pig iron and foundry pig iron, and the latter is mainly ferromanganese and ferrosilicon. Alloy pig iron is used as an auxiliary material for steel making, such as deoxidizers and alloying element additives. Ordinary pig iron accounts for more than 98% of blast furnace smelting products, while steelmaking accounts for more than 80% of China's current ordinary pig iron. With the increase of industrialization level, this proportion will gradually increase.
In a broad sense, iron is also divided into chemically pure iron (including C is almost zero), industrial pure iron (including C less than 0.05%), and sponge iron, granular iron and so on. However, they are not blast furnace iron products, and their uses are also different.
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| Silicon windows,Silicon Lens and Silicon Optical Mirrors specifications: | ||
| Standard precision of Silicon lens and optical mirrors | High-precision of Silicon lens and optical mirrors | |
| Dimension Tolerance | φ5-250mm+0/-0.2 | φ3-350mm+0/-0.2 |
| Thickness Tolerance | 1-50mm+/-0.1 | 1-50mm |
| Centration | 3 arc minute | 1 arc minute |
| Surface Quality | 60/40 | 20/10 |
| Power(fringe@633nm) | N<λ/2@633nm(in 25mm) | N<λ/10@633nm(in 25mm) |
| Clear Aperture | >90% | >95% |
| Chamfer | Protected <0.5mmx45deg | Protected <0.5mmx45deg |
Silicon Mirrors,Infrared Si Lens,Infrared Silicon Wafers,Silicon Plates
China Star Optics Technology Co.,Ltd. , https://www.csoptlens.com