Lu Yan opened the [Tools] category and found the [Axe] in the initial tool at the bottom of the classification. This common tool for life can be manufactured even with the lowest level of proficiency.

In fact, if you simply want to pick up a tree, it is more advantageous to create a [saw], which is also the lowest-level tool, than an [axe], but after considering it, Lu Yan finally chose an axe.

The reason is very simple. Although saws have advantages in sawing trees, their functions are very single and can only be used in this job.

The axe is different. In addition to cutting, it can also be used as an initial weapon. If you encounter any danger in the wild, the axe is obviously much more useful than a saw!

[Materials required for manufacturing axe: 2 kg of steel, 0.5 kg of wood]

【Do you make it immediately?】

Lu Yan looked at the question box popped up on the manufacturing interface and chose to confirm it very simply.

【System】Steel-2, Wood-0.3

【System】Consumes Survival Point 1!

【System】The cutting axe was successfully manufactured!

【System】Tool production proficiency level 1 (1/30)

A 50-centimeter axe appeared in Lu Yan's hand. The handle was rough hardwood and had excellent friction. Even if it was stained with liquids such as sweat, it would not be lost.

The axe is shiny and has a different shape than the wood-cutting axe used in ordinary farming, but a wide-faced blade similar to the crescent axe.

Its overall shape looks closer to more weapons.

[Steel Axe (Inferior Quality)]: A brand new steel axe can be used to slash and chop, but please be careful not to use too much force!

"Depending on the material, are the tools created divided into advantages and disadvantages?" Lu Yan waved it a few times and felt it was pretty good.

The items produced by the manufacturing system are also divided into three levels: [low quality], [normal], [excellent], and the quality of items produced by different materials also varies greatly.

"It's fine if you can use it." Lu Yan didn't care about the grade of the axe. He just wanted to quickly get the load-bearing pillar of the safe house before dark.

Pushing open the door of the safe house, Lu Yan first looked around carefully. After confirming that there were no creatures wandering around, he quickly walked towards the small woods five hundred meters away.

...

Soon, Lu Yan arrived at the target location.

Although it is nominally a small forest, there are actually only more than twenty fir trees here, and seven or eight have already dried up and rotten.

Lu Yan circled around the woods and quickly selected two trees.

They are roughly the size of a bowl, straight and tough, and are perfect for use as a load-bearing column.

"The hardness of these trees also seems to be very high." Lu Yan gently knocked on the trunk with an axe and found that the sound coming back was not a dull sound of "dongdong", but a bit like a crisp sound that hit the stone. Obviously, the harsh living environment in the wilderness seemed to have prompted these trees to evolve, making them harder and more tenacious.

To cut a tree, you need to first cut out a wedge-shaped groove at the bottom of the trunk, and then completely cut it off from the other side. Only in this way can you control the direction of the tree falling to the ground so that it will not hit people.

Lu Yan rubbed his hands, plucked his strength and cut down to the thickest bottom of the tree trunk.

Dear!

The axe cut into the tree, and the trunk trembled slightly.

The huge shock force that came immediately made Lu Yanhu's mouth numb.

These fir trees are too hard!

Lu Yan rubbed his wrists, then swung his axe and chopped it down again.

After slashing seven or eight times in a row, only a crisp sound of "Dang" was heard, something unexpected happened!

Seven or eight spider-web-like cracks appeared on the axe blade. With a light slap, the axe blade shattered directly!

Seeing this scene, Lu Yan was stunned.

These fir trees are indeed harder than ordinary fir trees, but no matter what, they should not be stronger than steel axes!

The output of the system is so fragile and so vulnerable?

Looking at the broken axe in his hand and looking at the chopping hole of the fir tree that was only three or four centimeters deep, Lu Yan was stunned and angrily threw the axe next to him like throwing garbage: "What a broken thing! It's too slow!"

It seems that the plan to increase load-bearing columns will be delayed for a while, and this quality axe cannot meet the needs of violent logging.

When Lu Yanxin thought of living in a shaky safe house tonight, he felt anxious.

Suddenly, a trace of inspiration flashed in Lu Yan's mind, and he recalled something that happened a few years ago.

At that time, a grinding tool factory near Lu Yan's old house went bankrupt, and there was a lot of steel scraps that had not had time to deal with. At that time, Lu Xiaoyu, who was only six years old, also picked up a lot of steel scraps and came back to polish them as a toy card.

But during the production process, Lu Xiaoyu found that some of these steel sheets were very tough, while others were broken as soon as they touched them. She was puzzled and asked Lu Yan.

At that time, Lu Yan didn't know why, but as his elder brother, he couldn't say that it was not possible in front of his sister. So he read a lot of information all night and finally answered Lu Xiaoyu's question.

"The reason why steel breaks when touched is not because the material used to build it is too poor, but because the carbon content in the steel is too high, and the manganese content is too low!" Lu Yan slapped his head and said to himself in a hurry: "That's right! It's manganese!"

"Steel is an alloy product after pig iron is added to carbon. Generally, steels with higher carbon content have high hardness, but their toughness is relatively poor!"

"Manganese is a more fun thing. If you add about 2.5% to 3.5% manganese into the steel, you will create a steel called low manganese steel. Low manganese steel is very hard, but particularly brittle, like a piece of glass that breaks as soon as you knock it!"

"Just add some manganese into it, about 13%, and it can turn it into high manganese steel with strong toughness and high hardness! In this way, there will be no situation of breaking as soon as you touch it!"

The words he said when he answered Lu Xiaoyu's questions were not bad, and then he was back in Lu Yan's memory.

"Yes, this kind of steel is obviously the same as the steel that Lu Xiaoyu once picked up. It is a kind of low-manganese steel!" Lu Yan remembered that after he answered Lu Xiaoyu's question, the admiration and admiration expression on the other person's face and the soft "Brother is so amazing", which made Lu Yan remember it very deeply!

And it was also from that day that perhaps because of Lu Yan, a "learning and knowledgeable" role model, Lu Xiaoyu also regarded reading and learning as his hobby. So far, even Lu Yan didn't know how many books Lu Xiaoyu had read and how much knowledge he knew...

"That is to say, as long as it is re-smelted into high manganese steel, the axe created will be much tougher!"

"Try it!" Lu Yan became excited. He picked up the broken axe and the steel fragments on the ground, and then opened the [Decomposition] interface of the [Doom Survival System].

【Does the broken axe be broken down?】

【yes!】

【Successfully decomposed, 1.8 kg of steel and 0.45 kg of wood】

[After the finished product is decomposed, the material obtained will be one-tenth of the loss]

Lu Yan looked at the two piles of materials that had been decomposed, and the three big words [decomposed] are still displayed above the steel.

【Continue to decompose】!

[Successfully decomposed! Obtain 1.7 kg of pure iron, obtain 0.034 kg of carbon element, obtain 0.051 kg of manganese element, obtain phosphorus element, obtain sulfur element...]

【There will be no loss after the original material is decomposed】

Soon, five different materials appeared in Lu Yan's backpack, of which four of the elemental materials existed as solid black balls.

Lu Yan roughly calculated that the proportion of manganese elements obtained after decomposition is about 3% of the steel, which just met the [low manganese steel] standard I guessed just now!

Lu Yan praised Lu Xiaoyu in his heart, but he didn't expect that a child's curiosity a few years ago could actually allow Lu Yan to solve a big problem.

Then he took out 6 kilograms of steel and decomposed it, and obtained 0.18 kilograms of manganese element. Now the manganese element that Lu Yan has combined is 0.231 kilograms. By the way, it has reached more than 13% of the 1.7 kilograms of pure iron and iron.

Open the [Smelting] interface in the system, Lu Yan adds 1.7 kg of pure iron, 0.025 kg of carbon, and 0.231 kg of manganese, and click the Start Smelting button.

During the process of smelting steel, the road rock increased the manganese content and reduced the carbon content.

【Successfully smelted, 1 survival point is consumed!】

【Get 1.965 kg of steel】

Lu Yan looked at the new steel with a different color in the backpack than the ones that were rewarded before, took a deep breath and opened the manufacturing interface again.

【Select to create: Axe】

【Consuming wood, steel, survival points…】

【Create Successful】

【System: Tool production proficiency 3! (4/30)】

A brand new axe appeared in Lu Yan's hand.

[Steel Axe (Excellent) (Easy to Cut)]: A well-quality steel axe can easily cut some hard wood, stones, and bones! With it, your chances of survival will be greatly improved!

[Easy to cut]: The special effect capabilities of excellent products, cutting and cutting effects increase by 100%!

Lu Yan looked at the explanation of the new axe in his hand and was extremely excited. He suddenly turned his head and stared at the half-cut cedar tree again.

Bang!

He raised his axe and slashed. This time, the axe blade was tough and sharp, and there was no sign of damage again!

Ten minutes later, a fifteen-meter-high fir tree fell to the ground.

The axe blade... is still sharp and shiny, as stable as Mount Tai!

Useful! Really useful!

This is just learning mathematics, physics and chemistry well, and you won’t be afraid of traveling all over the world!

Lu Yan sat on the cut down tree trunk and laughed. In the end of life, these basic knowledge is really important.

He suddenly thought of the bookshelf of Lu Xiaoyu's room about these three types of books...
Chapter completed!