The specific method is to control variables.

As long as the temperature in the kiln can be controlled in different ranges, for example, the temperature in the first kiln is 600 degrees, the second kiln is 550 degrees, the third kiln is 500 degrees, and then the same thickness is processed in different temperature environments

With large and small steel bars, it is easy to test the optimal heat treatment temperature.

The key is, without high-tech equipment, how to accurately control the temperature in the kiln?

The method Li Mengxi came up with was indirect control. The temperature depends on the length of the burning time. The longer the burning time and the longer the heating, the higher the temperature will rise. And combustion requires oxygen. The more oxygen, the longer it will burn.

According to this, that is, as long as the amount of oxygen is controlled, the final kiln temperature can be controlled.

The way to control oxygen is to control space.

At this point, specific methods are available.

One hundred earthen kilns can be built. The first one has a space of 100 cubic meters and can hold 100 cubic meters of oxygen. The second kiln has 99 cubic meters and the third one has 98 cubic meters.

And so on.

Then, enough burning charcoal is put in each kiln. In this way, due to the difference in the amount of oxygen in each kiln, the charcoal burning time is also different, and the temperature in the kiln is also different, from a 100-square-meter kiln to

A kiln in ten directions must have a continuous temperature gradient from high to low.

In this way, the temperature in the earth kiln can be accurately controlled within ten degrees or even several degrees.

Then, the batch heat treatment process was successfully developed in a series of complex tests.

Once there is a way to mass-produce steel with suitable properties, it will be possible to mass-produce steel crossbows.

Only by being able to produce them in large quantities can the production advantages of steel crossbows be brought into play.
Chapter completed!