Armageddon: Shelters Can Be Upgraded Infinitely

Lu Yan opened the [Tools] category, and found [Axe] among the initial tools at the bottom of the category. This kind of daily tool can be made even with the lowest level of proficiency.

In fact, if you just want to pluck trees, the [saw], which is also the lowest-level tool, has more advantages than the [axe]. However, after thinking about it, Lu Yan finally chose the axe.

The reason is simple. Although the saw is very advantageous in sawing trees, its function is very single and can only be used for this job.

The ax is different, in addition to felling, it can also be used as an initial weapon. If there is any danger in the wild, the ax is obviously much more useful than the saw!

[Materials required to make an axe: 2 units of steel, 1 unit of wood]

[Do you want to make it immediately? 】

Lu Yan looked at the inquiry box that popped up on the manufacturing interface, and chose to confirm very simply.

[System] Steel - 2, Wood - 1

[System] Consume 1 survival point!

[System] The felling ax has been manufactured successfully!

[System] Tool making proficiency +1 (1/30)

An ax about 50 centimeters in Lu Yan's hand appeared. The handle is made of rough hardwood, which has excellent friction, and it will not fall out even if it is stained with liquid such as sweat.

The ax was shiny, and its shape was a little different from the woodcutter axes used in ordinary farming, but with a wide-faced blade similar to a crescent axe.

Its overall shape looks more like a weapon.

[Steel Ax (Bad Quality)]: A brand new steel ax that can be used to chop and chop, but please be careful not to use too much force!

"According to the different materials, are the tools made into good or bad grades?" Lu Yan waved his hand a few times, feeling pretty good.

The items produced by the manufacturing system are also divided into three levels: [bad quality], [normal], and [excellent]. Items made of different materials have very different levels of pros and cons.

"As long as it can be used." Lu Yan doesn't care about the grade of this axe, he just wants to get the load-bearing pillars of the safe house before dark.

Pushing open the door of the safe house, Lu Yan carefully looked around. After making sure that there were no creatures wandering around, he quickly walked to the small forest 500 meters away.

…

Soon, Lu Yan came to the target location.

Although it is a small forest in name, in fact there are only more than 20 cedar trees here, and seven or eight of them have already withered and decayed.

Lu Yan walked around the forest and quickly selected two trees.

They are about the thickness of the mouth of a bowl, straight and tough, and they are perfect for reinforcing load-bearing columns.

"The hardness of these trees seems to be very high." Lu Yan tapped the trunk lightly with an axe, and found that the sound coming back was not a muffled "dong dong" sound, but a crisp sound similar to hitting a stone. Obviously However, the harsh living environment in the wilderness seems to have prompted the evolution of these trees, making them stronger and more tenacious.

To cut a tree, you need to cut a wedge-shaped groove at the bottom of the trunk, and then cut it completely 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 together, gathered all his strength, and chopped down towards the thickest bottom of the tree trunk.

Benedict!

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

The huge shock force that followed immediately made Lu Yan's tiger's mouth numb.

These fir trees are so tough!

Lu Yan rubbed his wrist, then swung the ax again and chopped down.

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

Seven or eight spider web-like cracks appeared on the ax blade, and with a light tap, the ax blade shattered directly!

Seeing this scene, Lu Yan was stunned.

These fir trees are indeed stronger than ordinary fir trees, but no matter what, they shouldn't be stronger than steel axes!

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

Looking at the broken ax in his hand, and looking at the cedar tree that was only three or four centimeters deep, Lu Yan was dumbfounded, and threw the ax aside angrily like throwing trash: "What a broken thing! It's too bad!"

It seems that the plan to add load-bearing columns will be postponed for a while. An ax of this quality cannot meet the needs of violent felling at all.

Lu Yan felt anxious at the thought of living in a crumbling safe house tonight.

Suddenly, a flash of inspiration flashed in Lu Yan's mind, and some long-term memory fragments emerged from the depths of his mind.

That was eight years ago. At that time, an abrasive tool factory near the old house of Lu Yan’s family closed down, and there was a lot of scrap steel that could not be disposed of in time. At that time, Lu Xiaoyu, who was only six years old, also picked up a lot of steel scraps and prepared to polish them for toys. card.

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

At that time, Lu Yan didn't know why, but as an elder brother, he couldn't say no to his younger sister, so he went through a lot of information all night, and finally answered Lu Xiaoyu's question.

"The reason why steel shatters at the first touch is not because the material used to make it is too bad, but because the carbon content in the steel is too high, and the manganese content is too low!" Lu Yan patted himself on the head, and hurriedly said to himself He said to himself: "That's right! It's manganese!"

"Steel is an alloy product of pig iron with carbon added. Generally, steel with higher carbon content has higher hardness, but less toughness!"

"Manganese is a more interesting thing. If you add about 2.5% to 3.5% manganese to the steel, you will produce a steel called low-manganese steel. Low-manganese steel is very hard, but very brittle. It's like a piece of glass, it shatters when you hit it!"

"But it is also very simple to solve this problem. Just continue to add manganese to the steel, reaching about 13%, and it can be turned into a high-manganese steel with strong toughness and high hardness! In this way, there will be no accidents. It will break if you touch it!"

The words I answered Lu Xiaoyu's question at the beginning resurfaced in Lu Yan's memory without missing a single word.

"Yes, this steel is obviously the same as the steel that Lu Xiaoyu picked up before, it is a low-manganese steel!" Lu Yan remembered the expression of admiration on Lu Xiaoyu's face after he answered Lu Xiaoyu's question. And the soft and waxy "Brother is so amazing", Lu Yan still remembers it deeply!

And it was from that day, perhaps because of Lu Yan's "erudite and knowledgeable" role model, Lu Xiaoyu also regarded reading and studying as his hobby. Until now, even Lu Yan didn't know exactly what Lu Xiaoyu studied. How many books have you read, how much knowledge you know...

"That is to say, as long as it is remelted into high manganese steel, the ax made will be much tougher!"

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

【Do you want to disassemble the broken axe? 】

【Yes! 】

[Successfully decomposed, obtained 1.8kg of steel and 0.9kg of wood]

[After the finished product is disassembled, the obtained materials will have a loss of one-tenth]

Lu Yan stared at the two piles of materials that had been decomposed, and the three characters [Decomposable] were still displayed on the top of the steel.

[Continue to disassemble]!

【Successful decomposition! Get 1.7kg of pure iron, get 0.034kg of carbon element, get 0.051kg of manganese element, get phosphorus element, get sulfur element...]

[After the original material is decomposed, there will be no loss]

Soon, there were five different materials in Lu Yan's backpack, four of which were elemental materials in the form of solid black balls.

Lu Yan made a rough calculation, and the manganese element obtained through decomposition accounts for about 3% of the steel, which just meets the [low manganese steel] standard guessed just now!

Lu Yan praised Lu Xiaoyu in his heart. He never thought that a child's curiosity a few years ago could actually allow Lu Yan to solve a big problem.

Then he took out 6 units of steel and decomposed them again, and obtained 0.18kg of manganese. Now Lu Yan has a total of 0.231kg ​​of manganese. In conversion, it has reached the standard of 13% of 1.7kg of pure iron.

Open the [Smelting] interface in the system, Lu Yan added 1.7kg of pure iron, 0.025kg of carbon, 0.231kg ​​of manganese, some sulfur and phosphorus elements, and clicked the button to start smelting.

In the process of smelting steel this time, Luyan increased the manganese content and decreased the carbon content.

[Smelting is successful, consume 1 survival point! 】

【Obtain 2 units of steel】

Lu Yan looked at the new steel in the backpack, which was a little different in color from the previously rewarded steel, took a deep breath, and opened the manufacturing interface again.

[Choose to build: Axe]

[Consumption of wood, consumption of steel, consumption of survival points...]

【Build success】

[System: Tool making proficiency +3! (4/30)]

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

[Steel Ax (excellent) (easy to cut)]: A high-quality steel ax can easily cut some hard wood, stone, and bone! With it, your chances of survival will be greatly improved!

[Easy felling]: The special effect ability possessed by high-quality products, the effect of cutting and felling is increased by 100%!

Lu Yan looked at the explanation message of the new ax in his hand, feeling extremely excited. He suddenly turned his head and stared at the half-cut fir tree again.

Boom!

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

Ten minutes later, a fir tree 15 meters high crashed to the ground.

The blade of the ax...is still sharp and shiny, as stable as Mount Tai!

it works! Really useful!

This is what it means to learn mathematics, physics and chemistry well, and not be afraid to travel all over the world!

Lu Yan sat on the felled tree trunk and laughed. In the last days, these basic knowledge are really important.

He suddenly thought of the three types of books on the bookshelf in Lu Xiaoyu's room...

Seems like a lot! ?

The first release of this book comes from 17K Novel Network, so you can read the genuine content for the first time!