The earliest pig iron steelmaking was produced in what country 10

As a Chinese, these are still worthy of our pride, and steel has been found in the ruins of the Warring States in our country.

Northern Song Dynasty. During the Northern Song Dynasty, China's ironmaking technology progressed and iron production increased significantly. During the Northern Song Dynasty, the annual output of iron was as high as 8 million catties at its peak, which seems to be a lot, and the current unit is only 4,000 tons of iron (China's current annual steel output is 100 million tons).

But in ancient times, the country's annual output of 4,000 tons of iron is already a very remarkable number, according to the weight of the iron pot at that time, this year's iron output in the Northern Song Dynasty, if all taken to make iron pots can make more than 1 million, with such an entry-level iron production, in order to meet the needs of armor, coins and Buddha statues, etc., for the folk tens of millions of people in the pot stove service.

It is precisely because of the popularity of iron pot in the Song Dynasty that it effectively promoted the promotion of Chinese stir-fry in the Song Dynasty.

Pig iron. The steelmaking method was invented in China, because China has relevant records in the high-quality Pei Spring and Autumn Period and the Warring States Period, so China is the earliest country to discover and master the body steelmaking technology, let's take a look at what the main process of body steelmaking is.

There are usually two methods of steelmaking, one is to use pig iron to smelt steel, and the other is to directly extract molten steel from the ore. Put the body in the steelmaking furnace, you can get steel products according to certain steps, there are many kinds of steel, usually we mean steel composed of various steels, steel is a black metal, but not all ferrous metals are steel.

As early as more than 3,000 years ago, our country has understood the main properties of iron, and can distinguish some differences in the properties of iron, we often cast iron on some weapons, so that we can make the weapon more tough, and then with the maturity of bronze technology, iron smelting technology has also begun to further develop, China first began to smelt iron in the Spring and Autumn Period and the Warring States period appeared, when people began to invent pig iron smelting technology, from the recent archaeological invention records, People have to use iron directly.

Iron is cast, and iron is heated and turned into flexible iron before casting.

But there is a common place in the process of iron casting has been constantly improving, China's cast iron smelting technology has reached a relatively mature period, from the Jin Kingdom.

During this period, we can learn about many large tripods made of iron. In order to be able to make it flexible.

And the solidity is stronger, so people try to use pig iron to smelt steel, pig iron itself is relatively soft, and the role of moist Qi Weislip is also more obvious, used to cast can have good wear resistance and shaping.

Performance. However, because the strength of pig iron is not hard enough, it must be smelted with some other metals to have better results.

The above story only represents my personal opinion, if there are any mistakes, please understand.

Pig iron steelmaking method is invented in our country, it is a pig iron smelting into steel is a kind of work-called basic art We often cast iron on some weapons, so that the weapon can be more tough, and later with the maturity of bronze technology, iron smelting chain mold technology has also begun to further develop, people have directly used iron to cast iron, and there are also iron heated into flexible iron and then cast slowly.

It was not invented in our country, it was invented in England. Because we needed to refine the purity of steel at that time, but the resources of steel were scarce, pig iron was used for smelting.

Yes. After a long period of non-liquid rent, and it has been used accordingly in the Xia Yu period in our country, and some iron tools have appeared at that time, indicating that they have learned to develop and use at that time.

Similarities: both can make steel. But casting pig iron is expensive, and steelmaking is not cost-effective.

The silicon content of steelmaking pig iron is not greater than that, and the carbon exists in the form of Fe3C. Therefore, it is hard and brittle, and the fracture is white.

The silicon content of cast pig iron is carbon, and it mostly exists in the graphite state. The fracture is gray. Soft and easy machining.

Molten iron is mainly smelted from the ore in the blast furnace first, the carbon content and impurities of the molten iron at this time are higher, and it can be used to cast pig iron blocks and send them to the converter to make steel, usually when making steel, some scrap iron with low carbon content should be added, and this molten iron can also be further smelted to remove some impurities (including near-step decarburization) and decompose the iron three carbons (carbide, for which silicon is sometimes added, at this time, it is necessary to consider whether the silicon content is allowed when making steel) is precipitated in a stone grinding state, and is used as a casting casting (cast iron).

Pig iron has a high carbon content in the supereutectic composition, and cast iron has a low composition in the subeutectic composition.

They are further smelted to reduce carbon (including scrap iron mixed with low carbon), and the carbon content is further reduced to become steel. Other alloying elements are often added to the steel, and the proportion of alloying elements (including carbon) in the steel is adjusted by smelting, and various types of steel are smelted, which is the process of steelmaking. It can be seen that both pig iron and cast iron can be used to make steel.

Steel is then decarbonized to become pure iron, also called wrought iron. Wrought iron is soft. The smelting of pig iron to wrought iron is mainly a reduction in carbon content.

Steelmaking pig iron is a blast furnace continuous casting steelThe main product of ironmaking, its output accounts for more than 90% of the production of blast furnace pig iron. In modern steel production, it is mainly used in the form of high-temperature molten iron (1350 1400) for oxygen top blowing converter steelmaking. With the progress of electric furnace steelmaking technology and the need to smelt pure steel, electric furnace steelmaking now also uses high-temperature molten iron that accounts for more than 30% of the metal material.

In continuous steel casting without steelmakingIn ironworks, molten iron is cast into blocks of iron for steelmakers that do not have iron. The basic chemical composition of steelmaking pig iron is iron (94% 95%), and the rest are five conventional elements of carbon, silicon, manganese, phosphorus and sulfur, as well as some trace elements and some unique elements.

Principle: The steelmaking process requires the molten iron to have a certain silicon content as a heat source, and the heat released by silicon oxidation is not only conducive to blowing, but also provides conditions for more scrap steel. However, the silicon content of molten iron is too high, which not only increases the coke ratio of ironmaking and decreases the output, but also prolongs the blowing time of steelmaking, which not only wastes oxygen, but also consumes more lime for slag making, and also reduces the life of the furnace lining, so the silicon content of steelmaking pig iron should be controlled below according to the national standard.

With the development of steelmaking and ironmaking technology, the silicon content of pig iron made directly from molten iron is generally controlled at the middle and lower limit of L08. L10 is mostly produced by fluctuating furnace temperatures, but there are also conventional products of small and medium-sized blast furnaces, which are cast into iron blocks for iron steelmaking. Due to the low temperature of the molten iron melted in the iron furnace (around 1320), the higher silicon content is conducive to steelmaking blowing.

In the process of steelmaking, not only iron ore is needed, but also scrap steel, which is what you call 'steelmaking pig iron', the ore in the blast furnace and the pig iron should be proportional, generally the pig iron in the converter accounts for 10%, and in the electric furnace it accounts for 80! ok？

Pig iron is extracted from iron ore, which is the raw material for steelmaking.

It is when you go through a catastrophe and do not fall, and become stronger for it, this process is "iron into steel".

But I'm sorry I misread your question. I'm sorry..

You "steelmaking pig iron", I really don't understand. This should be a chemistry topic.