Chapter 40 (1/2)

Stone bear ignored the people around him. He picked up the arrow and looked at the place where it was wiped out. He couldn't help smiling.

Without him, the silvery white light revealed from the part that was wiped off oxide is proving the material identity of the arrow very strongly - I am a piece of steel! Real steel!

Many people in later generations know that the difference between iron and steel can be easily distinguished by distinguishing the color of metal.

Whether it is pig iron or wrought iron, it presents a gray color, while steel presents a silver white color.

Although we still don't know whether the arrow in front of us is low carbon steel, medium carbon steel or high carbon steel, there is no doubt that the color of the arrow has confirmed that we didn't have any white rectification yesterday. What we rectified is really steel!

The stone bear laughs, and then under the gaze of a group of people, he raises the stone hammer again and smashes it at the arrow.

Both Li Lei and kabulu have seen the process of the stone bear smashing the three iron pots with the stone hammer. They know the power of the stone hammer very well.

Such a big iron pot can't stand two hammers, such a small arrow, if it goes down with one hammer, doesn't it have to be smashed?

This is the iron arrow. There has never been an iron arrow in the tribe. In the past, although the arrow made of animal bones and stones was powerful, where could the iron arrow be powerful? Iron is much harder than bone and stone tools. This is the common sense of all the people in the tribe.

However, with the exclamation of the crowd, the stone hammer did not break the arrow. The arrow was only slightly deformed, but a small hole broke out from the big stone or the hammer face.

This situation makes a kind of high-level tribe exclaim again - they have never seen such hard iron before.

Now the stone bear is completely satisfied.

As we all know in later generations, whether it is pig iron or wrought iron or steel, there is actually a common name, that is iron carbon alloy. However, because of the different carbon content, the physical properties are greatly different.

Generally speaking, the higher the carbon content of iron carbon alloy, the harder it is, but at the same time, the lower its toughness is. The carbon content of pig iron is more than 2%, so pig iron is very hard, much harder than steel. However, pig iron is also very brittle, and some pig iron can even be broken by a fall.

The ripe iron is a kind of iron carbon alloy with carbon content less than 0.02%. The ripe iron is very soft, has good plasticity, good ductility, can be drawn into wire, and has low strength and hardness, so it is easy to forge and weld.

As for steel, it is a general term for iron carbon alloy with carbon content between 0.02% and 2.11%.

In other words, the hardness of steel is lower than that of pig iron, but higher than that of wrought iron. Similarly, the toughness of steel is lower than that of wrought iron, but higher than that of pig iron. In other words, steel is a kind of metal with both toughness and hardness, so the use of steel is far greater than pig iron and wrought iron.

If the carbon content of the arrow is too high just now, the arrow will be smashed with this hammer. And similarly, if the carbon content is too small, this hammer down although not broken, but absolutely can smash the arrow flat!

But this arrow is not so big. It can almost prove that the product of the final cooling of the molten steel measured by Shi Xiong yesterday is a kind of medium carbon steel.

Although it is impossible to determine what type of medium carbon steel this is, Shi Xiong knows that with this tool, whether it is to build weapons or civilian products, it is enough.