Chromium is a very special metal, pure chromium itself, insoluble in acids, but can be regarded as passivation, once passivated, can be dissolved in all acids, but his oxidation effect is very small, only at high temperature, or in a special state, can be oxidized.

Ferrochrome alloy is a special steel alloy, compared with ordinary steel, it may not be comparable with ordinary steel in terms of hardness and wear resistance, but it is a corrosion resistance, which is a huge benefit.

Iron is easily oxidized in the natural environment, from solid to powdery ferric oxide, which will cause a great change in its own strength, and some iron decay can also be said in the same way.

Steel is slightly better than iron, but it is only a little better, and it will also be oxidized in the natural environment under the premise of infrequent use or without an anti-rust coating on the surface.

The reason why copper, as an ancient monetary unit, is scarce is only one aspect, the key is that in the natural environment, copper may rust, but the main form will not change significantly, and the rate of oxidation is also very slow.

In the Northern Song Dynasty, because of the shortage of money, not only the prototype of paper money such as Jiaozi appeared, but also iron coins, to a certain extent, they were quite popular.

On the premise that metal currency and iron itself have value, the emergence of iron coins is also a natural trend, but the value of this appearance is far lower than that of copper coins.

In the past, the price of iron was only a quarter of that of copper, that is, under the premise of the same currency value, iron coins should be much cheaper than copper coins.

In fact, unprofitability is the biggest problem faced by iron coins, but coins need a lot of things, not to say, to make an iron ring can be, there must be words, there must be a seal, to be easy to carry.

This is a big problem, copper coins are difficult to forge, forging different looks, and even molds to forge, but iron coins are too cheap, and if you invest a considerable amount of labor, it is a kind of gain that outweighs the loss.

Often, the iron coins circulating in the Northern Song Dynasty, at most, are just a circle, and even the shape is not uniform, let alone a string of strings, worn together, often this kind of more sophisticated, more expensive, but also retain value, but such an investment, far from ordinary can be compared, to a certain extent, the forger will lose money.

This is also the fundamental reason why iron coins are in circulation for a short period of time and then disappear.

Zhao Xin's idea, in essence, is different from the ordinary currency value, he has simplified and cheapened iron, the current cost of iron is only about 13 Wen, even if it is steel, it is not more than 15 Wen, but the previous impression, plus Zhao Xin's purpose in making this iron coin, is to simplify the coin environment of the Northern Song Dynasty.

To put it bluntly, a new currency was created with a new currency that was obviously more expensive than copper coins, but it was cheap, durable, and beautiful, and so on, and the price of copper coins should have been higher than in the beginning.

Only then could a complete currency be formed, and the amount of money was much larger than that of the current Northern Song Dynasty.

The money shortage in the Northern Song Dynasty has always existed, and there is no deep understanding of the impact of the money shortage on the economy, for example, the reduction of private currency has affected the operation of commerce, there are not enough coins to buy products, barter, and even silk has been incorporated into the field of coins.

The taxation of the Northern Song Dynasty has always been common to money and silk, and to a certain extent, silk has also replaced the role of coins.

However, silk is used as a coin, which deviates from its role, and as we all know, the more it is circulated, it will inevitably be dirty and will be lost.

For ordinary copper coins, some wear and tear, some dirty, nothing, but the silk is dirty, or even damaged, what is this, this means that the currency is consumed and depreciated.

On the other hand, for the peasants, the rise in prices and the difficulty of obtaining various currencies made their lives more difficult, and sometimes, the labor force was exploited in this way.

If there was enough money, this would not have happened, just like the blacksmith's workshop now, which had enough money to pay for it, and formed a huge market among the entire high-income group.

At present, the supply of the blacksmith's workshop is insufficient, it is only a workshop, not a complete city, and a reasonable city cannot supply all the needs of the whole city, in this case, many markets are obtained by others.

This can be seen from the recent boom in commercial and trade activities in the Daimyo Mansion, and Cao Di even found that the commercial income of the Daimyo Mansion has increased significantly.

The tax level of the Northern Song Dynasty was quite low in feudal society, although the commercial tax of various names, but in general, in kind and money itself, it should only be 10 draws of 1, this range is really low, which is also a representative of the prosperity of commercial and trade activities.

However, in just a few months, the level of commercial taxes has increased by almost seventy percent, not to the extent of doubling, and it is conceivable that most of them are brought by blacksmith workshops.

Economics is a very complete subject, although it is also a liberal arts, Zhao Xin does not know much, but he finally knows more than these natives.

Under the premise that there is no justifiable tax burden, because we have become accustomed to one out of ten, rashly raising taxes, even if it does not affect the overall life, will usher in a huge rebound.

However, it is completely possible to replace taxes and fees, and the future Dinghai, market, factory, and even sales are completely controlled by Dingjun, adjust the proportion, and quietly promote the products under the premise of making the residents and workers happy.

For example, the cost price of iron tools is the same as that can never be obtained, from the cost of 13 Wen to 75 Wen, or even higher, in addition to the profit and labor cost given to the factory, the rest is net income.

In the case that the boss and the government are one, this can be regarded as a disguised charge, so that as long as the population of the navy is sufficient, relying only on the personnel of the navy, it is enough to support a strong industry.

The reason why China is terrible, in fact, lies in the development of agricultural science and technology and the hard-working people.

Under the premise that the whole world is developing in the same way, why can China develop to a population of 100 million, but Europe, or under the small country and widows, dozens of knights, hundreds of peasants and soldiers, can be called the era of large armies, food, is the most important of them.

Putting these aside, when this stainless steel coin can replace 80-100 Wen money, the money has always been only 10 pieces, that is, 200 grams, only one-twentieth of the copper coin, for large transactions, it has been saved a lot.

For example, the current full amount of copper coins, the consistent money is 4 kilograms, 10 guan is 40 kilograms, an adult male, under the premise of ordinary strength, can only pick up about 20 guan at most, simple money, has been so pressed that he can't walk.

Of course, the currency value of copper coins is very high, a bun is 10 Wen, consistent money, almost the luxury of ordinary people for a day, but for large merchants, it is very inconvenient.

Even if it is to carry a car, it is only to fit 100 to 200 yuan, small-scale purchases are OK, large-scale purchases, it is really not good, silver and gold, has flowed into the market, in some large transactions, as currency, but the value of the currency fluctuates greatly.

At the beginning of the Song Dynasty, the price of one or two gold was about 8,000 Wen, that is, 8 guan, and in the sixth year of Tiansheng, the time of 40 years was only 8,800 Wen, an increase of almost one percent, and in terms of time, it was relatively stable.

However, after that, with the war and other circumstances, the price of gold continued to rise, and during the period of Zhezong, it had already exceeded Wanwen, and less than 20 years later, in the early years of Huizong, it had reached 32 times, an increase of almost 3 times.

Even in ordinary years, along with the summer and autumn harvests, there are other fluctuations, and the price of gold begins to fluctuate dramatically, coupled with the small amount of money, which is not enough to support large transactions, and is often regarded as an international currency.

For example, in the peace talks between the Lanyuan Alliance and Qingli, and in the contracts with the Western Xia and Liao, the Northern Song Dynasty took out all the silver.

Gold and silver, as a unit of measurement and high-end currency for a long time, have not been large-scale circulation, the reason is that China produced very little silver, that is, in the Age of Discovery, Spain and Portugal, after obtaining the terrible gold and silver in the Americas, and through the trade of silk and tea, large-scale inflow into China.

It was not until the middle and late Ming Dynasty that the method of the silver standard was determined, and before that, don't even think about it.

Because of this, Zhao Xin attaches great importance to stainless steel, which is strong, durable, and not easy to wear, which of course refers to the daily situation.

As long as it is made, in terms of weight alone, it can increase his liquidity by more than 20 times, not to mention the total amount.

Not to mention the future, when the transformed blast furnace can produce stainless steel in large quantities, it is in 10,000 tons, just say that Zhao Xin's card system, it is estimated that the output of a day will exceed 50 tons, and a year, it will also be 18,000 tons.

According to Zhao Xin's rough pricing, 20 grams is almost equal to 100 Wen, one kilogram is 5 guan, one ton is 5,000 guan, 18,000 tons, which is nearly 100 million guan.

When Zhao Xin found Niu Dali, Niu Dali was still experimenting, but this time it still failed.

Zhao Xin had been watching Niu Dali's experiment, and he understood why it failed.

Because Niu vigorously used the previous method of refining divine weapons, directly mixing steel and chromium, and then pleating the method.

Seeing this, Zhao Xin regretted a little, he should have come earlier, so he didn't have to waste so much time with Niu Dali, this is the method of refining the magic weapon by hand, to put it bluntly, it is to make the proportion of carbon reach a certain degree through mixing, and form a stable alloy, but stainless steel, it is necessary to use alternative methods, the existence of carbon, will definitely affect the quality of stainless steel, and even cause failure.