The nickel-manganese material in the glass bottle weighs about fifty grams. Obviously, in the 1937 era, this metal, which was very common in later generations, was expensive, and the outer packaging was all made of glass bottles.

After waiting for so long, I finally got two crucial materials that were urgently needed.

For Yu Hua, there was no way to obtain the nickel-manganese metal that was highly controlled by the National Government. Of course, if he wanted to, he could go to Tianjin to find Zhang Zizhong, but Yu Hua did not want to contact Zhang Zizhong too much.

Respect, but not close.

"Thank you, how much is it?" Yu Hua took the two glass bottles, thanked Lin Wan, and asked.

"No money, it's given to you by the organization." Lin Wan shook her head. Although nickel and manganese are expensive, the quantity Yu Hua wants is extremely rare, adding up to only five yuan.

Of course, if you convert the two materials into prices per ton, they are ridiculously expensive.

50 grams of nickel, 3 oceans, is equivalent to 60,000 oceans per ton.

50 grams of manganese, 2 oceans, equivalent to 40,000 oceans per ton.

What is expensive?

That’s it!

The reason why nickel-manganese materials are so expensive is mainly due to high foreign demand and China's lack of nickel resource exploration and mining capabilities. More than 90% of the country's nickel-manganese ores are mined by foreign companies for export and to earn foreign exchange, causing prices to remain constant.

Staying high.

Of course, the Nationalist Government has no plans to change this. Not only is it not prepared to change, it is even happy to see this happen, because the higher the domestic price of nickel and manganese, the higher the tax will be.

You can’t use it yourself, there are no mining costs, and you can collect generous taxes on exports, so why not?

"Say thank you to those comrades for me, Jin Yu. This is what I just wrote. Please give it to Mr. Wu along with this technical information and the technology transfer contract."

When Yu Hua heard these words, he nodded and did not continue to struggle. He placed the two glass bottles on the table, opened the drawer, took out two documents, compiled the articles he had just written on the table, handed them to Lin Wan, and said with a smile.

: "I have already signed the technology transfer contract. When Mr. Wu signs it, the technology of Yu's Seven Towers belongs to the organization, and the technical information is very important. As for the third article, it is my technical advice on establishing a sulfuric acid industry in the base area, regarding technical difficulties.

I have written all the questions and problems on it so that we can avoid detours."

"good!"

When Lin Wan heard this, her face immediately became serious, and she immediately understood the importance of these three documents. She took the three documents solemnly with both hands, and was about to turn around and leave. Suddenly she realized something, turned around, looked at Yu Hua, and was silent for a second.

Asked: "Are you ready to leave?"

"Well, it's almost time. I'm going to leave tomorrow morning. I have to trouble you with the remaining work. You know, learning is my pursuit." Yu Hua smiled and did not refuse the question, nodding in affirmation.

It was late May, and towards the end of the month, Yu's Seven Towers research and development project ended one day ahead of schedule. Yu Hua was preparing to return to Peiping to prepare for the upcoming life in Tsinghua Park.

I entered Tsinghua University in June, and the Marco Polo Bridge Incident broke out on July 7. Around August, the examination for government-sponsored students studying in the United States will be held in Nanjing. Time is very tight.

After hearing this, Lin Wan fell into silence again. She stared at Yu Hua with a pair of jewel-like eyes. After three seconds, she nodded seriously: "I will try my best to catch up with you. See you in Tsinghua University, Yu Hua."

There is no reluctance, no sadness, no little daughter attitude, everything seems free and natural.

"See you at Tsinghua University, Jin Yu." Yu Hua smiled.

The bedroom door closed and silence returned.

After Lin Wan left, Yu Hua turned to look at the two glass bottles on the table: "It's better to choose a better day. Let's use this evening to modify a micro electric furnace to make armor steel samples. This smelting technology is also

It can provide an effective metal smelting method for the organization. After all, the Red Army has no shortage of oil and coal."

Electric melting furnaces, also called electric arc furnaces, use the high temperature generated by electrode arcs to smelt metals. The melting temperature is as high as more than 3,000 degrees Celsius. It can basically meet the smelting needs of all materials. It can smelt high-quality alloy steel and high-strength steel, as well as gold and silver.

, copper, aluminum, manganese, nickel and other metals, effectively remove various impurity elements and improve purity and material performance.

Its working principle is very simple. You only need to put an energized electrode into a crucible filled with metal materials to smelt.

The disadvantage is that it requires electricity and consumes a lot of energy.

This is one of the mainstream metallurgical processes of later generations. Its working principle is almost the same as that of electroslag remelting technology. It is essentially based on the physical principle of thermal effects of electric current. Its status and status are lower than that of electroslag remelting.

Of course, electric arc furnaces and electroslag remelting seem to be the same, but in fact there are big differences. In terms of material properties of the final smelted metal, the former is equivalent to an unguided rocket, and the latter is equivalent to a precision-guided strategic ballistic missile.

Generally speaking, the steel produced by electric arc furnaces needs to be purified by electroslag remelting to meet the needs of gun barrels and barrels.

The status of electroslag remelting cannot be shaken.

Well, what's interesting is that the requirements for 'gun barrel' and 'gun barrel' are the military weapons and equipment standards of China during its prosperous times. The current era's performance requirements for high-strength steel are not as harsh and abnormal as those of later generations. Just electric arc furnace production

High-strength steel can meet the strength requirements of gun barrels and barrels.

And this, for the base area where there is no shortage of oil, the electric arc furnace metallurgical process based on electric energy is simply great news.

You must know that historically, the manufacturing of weapons and equipment of the Eighth Route Army has always been hampered by the backward level of metallurgical technology. Due to the inability to independently manufacture high-strength steel and high-quality alloy steel, the steel for the production of grenades, gun barrels and bullets basically came from the Japanese war zone.

Rail resources.

The Eighth Route Army has no shortage of strategic materials such as gasoline and diesel!

"Electric arc furnace technology, consider it a meeting gift from me to the organization..." Yu Hua murmured softly.

Just do what you say, no ambiguity.

The generator, submerged arc welding machine and steel are all ready-made. The crucible only needs a graphite electrode and a graphite container. The prerequisites for the entire smelting process have been fully lit without any obstacles.

Yu Hua does not need the various tall electric arc steelmaking furnaces with a single furnace capacity of 100T in later generations. He only needs a small electric arc furnace with a single furnace capacity of 2 kg to meet the demand.

Picking up the glass bottle containing nickel-manganese material, Yu Hua left the bedroom and walked towards the brick building No. 1 where the submerged arc welding machine was placed.

…

Making a crucible is essentially a game of playing with mud.

The entire graphite crucible consists of graphite inner wall, refractory material and stone outer wall to form the main body of the crucible. The graphite comes from previously purchased materials, the refractory clay is loess and gravel in the corner, and the stone outer wall is the tamping jar contributed by Xiong Shenggang.

At three o'clock in the morning, a simple stove was built in the open space of Brick House No. 1. The temperature in the stove was as high as 1,200 degrees Celsius, scalding hot, and in the middle, there was a black stove and five black thin rods.

.

After firing at high temperature for one and a half hours, the time is up.

Yu Hua held the tongs and carefully took out the newly fired graphite container and graphite rod one by one. The surface of the graphite container was reddish and felt hard. When touched lightly, it sounded like metal.

Graphite containers made of natural graphite are crucibles with the highest thermal conductivity. In this era when cast iron crucibles and steel crucibles were still commonly used, the thermal conductivity of graphite crucibles was simply a dimensionality reduction blow.

After the graphite container cooled slightly, Yu Hua put it into a tamping jar.

"Sir, you want the yellow mud and gravel." Xiong Shenggang showed respect on his face and presented the dry loess and gravel.

There were only two people in the yard, Xiong Shenggang and Yu Hua. After the previous celebration, he returned to Brick House No. 1 to be on duty and guard the equipment. When Yu Hua arrived, he began to help.

Yu Hua nodded, then put the refractory clay into the gap between the tamping pot and the graphite container, and then poured in various irregular scraps: "Get ready to start work."

Everything is ready.

After hearing these words, Xiong Shenggang turned on the submerged arc welding machine that had been connected to power according to the pre-arrangement, adjusted it to the maximum output power, clamped the graphite rod used as an electrode with the welding tongs, and after doing all this, reported: "Sir, I

Ready."

"Xiong Shenggang, before taking the next step, I would like to ask you, are you absolutely loyal to the organization?" Yu Hua did not rush to the next step. He stared at Xiong Shenggang in front of him and asked seriously.

loyalty!

This is the most basic and important thing. Although the electric arc furnace technology, which Yu Hua defined as a gift, was born as early as the early 19th century, it is undeniable that this technology was still an advanced metallurgy in the era of 1937.

Process technology, especially graphite crucibles.

Graphite crucibles and electric arc furnaces are a perfect match. Although Yu Hua is not sure what type of crucibles are currently used in electric arc furnaces in the steel and metallurgical industries around the world, graphite crucibles are definitely not used.

Because this is a crucible technology that was only developed in modern times.

The importance of loyalty lies in whether this technology will be leaked. Xiong Shenggang, who has a junior high school education, is undoubtedly the best candidate to learn and apply this metallurgical technology.

After this period of getting along and observing, Xiong Shenggang has a calm personality, good conduct, strong observation and execution skills, and most importantly, his strong body does not affect his brain.

This man is very smart.

"Yes!" Xiong Shenggang was startled when he heard this question, his face flushed a little, his back straightened, and he responded loudly without thinking.

To a soldier, especially to a soldier, Yu Hua's question is tantamount to...

humiliation.

But Yu Hua's extremely solemn expression made Xiong Shenggang dare not get angry. He had never seen Yu Hua show such an expression.

"Okay, I hope you won't disappoint me, Xiong Shenggang, this is the technical information on the new electric arc furnace smelting process invented by me. It can smelt high-strength steel used to make pistol barrels, rifle barrels, mortars and recoilless rifles.

steel, and other high-quality alloy steels. This technical information includes the technical principles of electric arc furnaces, graphite rod formulas, graphite crucible formulas and firing requirements. This is the most important core secret of electric arc furnace smelting technology. As long as the single furnace capacity reaches 6

Kilograms can meet the demand for 60mm caliber mortar tubes."

Yu Hua looked at Xiong Shenggang, and took out the electric arc furnace technical information he had written overnight with his right hand. With piercing eyes and an inexplicable aura, he carefully elaborated and explained the importance and key points of the electric arc furnace metallurgical process, as well as its future applications, with extremely serious words.

: "And your mission is to learn and completely master this metallurgical technology, do you understand?"

The formula of graphite rods and graphite crucible is the soul of electric arc furnace metallurgy. The graphite crucible formula given by Yu Hua has a performance level of about 2010, which is completely sufficient.

"What?" Xiong Shenggang's mind seemed to have been hit by a heavy hammer, and his heart was shocked. He couldn't believe what he heard.

It can smelt high-strength steel used to make pistol barrels, rifle barrels, mortar barrels and recoilless rifles, as well as other high-quality alloy steels!

Although Xiong Shenggang only had a junior high school education, he could not resist his eagerness to learn and was willing to take the initiative to understand and learn unfamiliar knowledge. It happened that he knew some basic knowledge about metallurgy.

The metallurgical level determines the quality and performance of steel. Due to the lack of sufficient metallurgical technology, the current metallurgical level in the base area is still in the state of "iron-making" and cannot make steel.
To be continued...