Because even if there is gray iron, you can save time without drying the mud mold, but after casting a solid gray iron column, you have to go through a series of technological processes, which is a few months later than the method proposed by Du Mu, which is nothing to say, after all, Du Mu's method, after casting, the cannon barrel will be completed, and it can be used.

But as Li Jiangtou said, there is no number of water temperature control and flow rate, so there is only one way, cast in large quantities, and then how much is not broken because of the control zhì is not good, just use it, so the yield rate, I am afraid that there is only about 20% of the finished product, and the quality of these finished products is really unknown.

And the most important thing is the Rodman casting method, which is fast, efficient, and material-saving, and the problem is that the thing is mainly used to make large-caliber heavy artillery, who does Ding want a 400-millimeter cannon to fight? Not to mention whether it can be built, and not to mention the details of whether the road in this era can bear the load, it is a question just where it will be used.

And the gray iron out, if the malleable cast iron can also be successful, about 100 mm rear-loading rifled guns, with a double-layer barrel, now with granular black powder, in the future steel can keep up, use nitro * projectile, if the burning rate of single-base nitrocotton is not ideal, copy the method of the former Soviet Union, by adding powdered bagasse, in order to increase the combustion rate of gunpowder...... Not to mention this era, conservatively speaking, it is enough to run rampant all over the world in three or two hundred years!

Yu A-Dan then asked another question: "Sir, I and other craftsmen think that it is better to use rear-loading shells; But Du Mingfu thought that the front-loading cannon and ammunition were easy to carry. And a ship of 100 cannons, like a fire gun array, the cannons are numerous. It didn't matter much about the head, but the smoothbore gun was enough. "This is another contradiction, they are arguing, so they come to find Ding Ding and must take it. The ammunition that Dumu said was easy to carry was a front-loading gun, barrels of gunpowder, and barrels of buckshot. Just move it to the ship, you don't have to make shells and bottom fires here in the factory. It is also necessary to install the projectile body, and the warhead must also have an adjustable fuse......

It's just that this is a question that Ding Yi doesn't have to choose at all: "It must be a multi-layer cannon barrel." Breech-loading rifled gun. You don't have to think about this, you go back and tell Li Jiangtou that he and Du Mu are good, they have their own ideas, and Du Mu also has his reasons, both of them may wish to list the articles of association like this in the future, and if they can't dispute like this next time, they can find Du Ziteng. Send some soldiers to measure it, and you don't have to travel thousands of miles to find me for ideas. ”

This Wuzhou to Beijing tens of thousands of miles away. went from Jingshi to Xuanfu again, and then got the news of Ding Yi and turned back, and there was no more for a few months. However, Yu A-Dan listened, kowtowed to Ding again, and begged for mercy again and again, the latter had to help him up again, and asked what was going on, only to hear Yu A-Dan say: "My master said that he had to wait for Mr. to reply anyway, and it would take time in the middle, so he taught the craftsman to do it according to his method and work first; Du Mingfu was so angry that he couldn't hand it over, saying that my master would do it himself, and when Mr. learned that he was going to ask for a crime and kill his head! The villain begs Mr. for mercy......"

Ding Yike was embarrassed, because if he agreed to Li Gongtou to do this, then he would definitely have similar things in the future; If Li Jiangtou is punished, it will be too demoralizing to people, and Li Jiangtou's plan should be said to be more reasonable. However, the institutionalization that Du Mu insisted on, that is, if there was no clear instruction from above, should not start construction indiscriminately, but it was also right......

In desperation, Ding Yi had no choice but to write to Du Mu and teach him to look at it, but try not to hurt the enthusiasm of Li Jiangtou.

But Yu Adan's problems are more than that, Ding Yi is not in Guangxi, Li Jiangtou compiled all his problems into a book, and he didn't let Yu Adan take it with him, for fear that someone would steal it and it would be over, so he taught him to memorize a stomach of problems, at this time, seeing Ding Yi, where can he just go back? At the moment, he kowtowed again, Ding Yi was scared by him, pulled it up and pressed it on the chair: "You ask, ask, it's just that you go back and tell Craftsman Li that I am not omnipotent, and many things still have to be done by himself." ”

As soon as he finished speaking, Yu A-Dan asked a question that Ding Yi couldn't answer: In addition to using diamonds, how to process steel?

Ding Yi was dumbfounded, but he also knew that Li Jiangtou really had a problem, and some mild steel was also produced, so he wanted to get some steel barrels in order to use nitro hair * to shoot - this thing can't be done, no steel barrel can not use nitro * projectile, because the muzzle velocity is high, and the lead bullet will melt under friction, so it can only be wrapped with a layer of copper skin, or copper plating, and where can the rifling of the wrought iron barrel withstand copper grinding? It didn't take a few rounds to wear it out.

The entire Ming Dynasty, don't look at the many revolvers in the first division, the three dragoon battalions are all rear-loading rifles, and those who can really shoot with nitro are the two revolvers on Ding Yi and Ding Junyue's batch of more than a dozen steel barrels - including the one in Ding Junyue's hand that was changed into a bullet shell sniper rifle, and the rifle in Zhang Mao's hand that is a hybrid freak and more than a dozen guns.

That's Li Jiangtou, a technical maniac, using diamond diamonds, that is, diamonds, hand-customized by several masters, and made them little by little. Diamonds are a non-renewable resource, and if they are to be mass-produced, how can they be used? There can't be so many diamonds, how many will always wear out. No matter how crazy Craftsman Li is, after getting those dozen barrels and Ding Yi's two revolvers, he will never do it again.

"High-speed steel, you have to let Li Craftsman make high-speed steel, or don't think about it." Ding Yi said helplessly to Yu Adan, "It's not high-carbon steel, it's just that output, you tell Craftsman Li not to go crazy, no need to test, definitely not." ”

At present, the high-carbon steel produced in Wuzhou is using a very backward method: first, the high-carbon pig iron is smelted into mature iron, carburized into carburized steel with high carbon on the surface and low carbon on the inside, and then melted in a crucible furnace to obtain steel with uniform composition. The cycle time of this steelmaking method is several days, and the output of each furnace should not exceed 30 kilograms. Other converter steelmaking proposed by Ding Yi has not been able to make high-carbon steel, and there is no progress except for the consumption of coke and iron ore.

It is mainly used to manufacture knives for various machine tools, hammer forging to manufacture the inner core of rifled barrels, and so on.

If you want to let Craftsman Li's technical maniac get it, he can toss all this bit of high-carbon steel.

"That thing has to be tungsten, I can't tell what tungsten is! Anyway, after adding tungsten, it is called high tungsten self-quenching steel or something...... I remember that it was associated with quartz mines...... What does tungsten look like? I can't tell if I said it, anyway, it's a high melting point, very hard and heavy......" Ding Yi felt like he was about to be driven crazy by Yu Adan.

Yu Adan, but he was thinking about Ding Yi's words: "...... Tungsten ...... High melting point, very hard and heavy......" After reciting, he asked Ding Yi again, "Sir, is the tungsten you are talking about a heavy stone?" ”

Ding Yi sighed and patted him on the shoulder: "I really don't know. ”

"How hard is it? Is it harder than diamond? ”

"I really don't know."

"How much molten steel do you want to put into it?"

"I really, really don't know!"

"Oh." Yu Adan, scratching his hair, nodded, and said, "What Mr. means is that we can't count on you all day long...... This villain knows, but sir, you can give me a hint...... "Ding Yi suddenly felt that a Yu Ah Dan, whose name is so dirty and his appearance is so honest that he is scum, is really more terrifying than Ye Xian and 100,000 iron horses. Yu Adan didn't know at all that he had risen to the height of 100,000 iron horsemen in Ding Yi's heart, and he was still there and asked, "Sir, after adding tungsten, if you can get the high-speed steel you said, can it also process high-carbon steel?" ”

Ding Yi stood up suddenly, grabbed Yu Adan's clothes, and said to him viciously: "Look at my eyes, look at my eyes!" Look me straight in the eye! Listen, I, really, don't know! ”

After dealing with it here, the infantry platoon escorted the messenger and Yu Adan, and then entered the Xuanfu in a hanging basket, and went to Tianjin to prepare to return to Guangxi by water. Tart Ma Chi Ikirata came up, salivated and begged Ding Yi: "Na Yan, in this Mo Nan garrison area, your most loyal minion, Tart Ma Chi Ikirata ......"

"Okay, after you enter Beijing, learn Han official etiquette with Boyan Timur and them, don't be a slave at every turn." Ding Yi knew that this guy was here to ask for an official, but he also needed such a person, and the Chinese name translated as Xiao Khan, who was the victorious of the Red Army, led the communication class and arrived at the Miyun avant-garde as scheduled, which can be regarded as a successful completion of the task assigned by Ding Yi, which made Ding Yi have a good impression of him, "You yourself are close to Boyan Timur and them, and I will have my own arrangements at that time, rest assured, there are big things to teach you to do." ”

Hearing this, Tart Machi Ikirata turned over and bowed, kowtowing again and again, but secretly made up his mind in his heart, just waiting for the power in his hand, and then borrow some soldiers from the Duyin tribe, and he must give the fat man the result of the Seven Tarts! Because after the seven tarts took refuge in the Xuanfu border generals, relying on the ability to get some weapons from the Xuanfu, the tribes that had bullied the Red Army from time to time, Ding Ruyu was detained in Beijing again, and the Anxi Governor's Mansion did not want to cause trouble according to Ding Ruyu's intentions, so it was not good to give the tart Ma Chi's head, and it was quite a grudge.

Ding Yi naturally didn't have the leisure to pay attention to such things, even the more than 20,000 standing military horses that remained in Wara, as well as tens of thousands of other grassland tribes, he threw them all to Ding Ruyu and Chen San to reorganize, and his focus was now on the Beijing Division.

He specially sent Li Yuncong to the Beijing Division, of course he knew that Empress Dowager Sun and Emperor Jing would be unhappy, so he wanted to see what tricks these two had to play, this time, Ding didn't plan to play with them. I have been enduring it before, it is fledgling, if I move, there is no absolute chance of winning, and now with the power of victory, Ding Yi still lets them toss as usual? How many brain fragments did he have to eat?

"Sir, can we go back to Beijing in time for the New Year?" Zhang Mao asked Ding Yi in a low voice on the side.

Ding laughed, pinched his face and said, "I don't know, but I do know that next year will be a good year." (To be continued......)