This high-carbon steel is more elastic than the medium-carbon steel used for springs, and the appearance is exactly the same, so a simple test will not find any difference at all, and you will even feel that the quality is better.

However, high-carbon steel is hard and brittle, and it is easy to experience metal fatigue when used to make springs, which can lead to cracking or breaking.

Zhu Linmiao was also worried that the quality of the products produced by Su Ji Iron Field was too good, and told him to mix a small amount of sulfur into it. Sulfur is the main harmful impurity of iron ore, and the main hazard is to make steel brittle.

Only the first batch of the guns bought by Jianyu was serious spring steel, and more than 1,000 flint guns were made, and after repeated tests, it was found that the effect was really good.

But the subsequent batches are all sulfur-doped high-carbon steel, but Cai Shiying has a preconceived idea that the quality of these "playthings" is the same, and there is no problem in picking out a few once in a while to try.

As a result, the builders who did not have steel inspection technology were doomed to fall into the pit.

Zhu Linmiao secretly calculated that as a clockwork, it can be used repeatedly four or five hundred times, and it is estimated that it will break seventy or eighty times when used on a fire spring with a much greater yield strength. These guns have to be tested twenty or thirty times in the production process, and the life span is at most about fifty times.

It's just that three of the ten are still unbroken, he frowned, it seems that the sulfur can be mixed with more, or add a little phosphorus to try......

Deng Shan rolled up his sleeves and shouted to the soldiers on the springboard: "Hold steady under your feet, the sea water is bitter and salty, and you won't drink less if you fall down." ”

On the side, Sun Qizheng commanded people to stack grain and grass on the car, turned his head and teased: "Lao Deng, I heard you have a nose and eyes, when did you fall into the water?" ”

"Go! I didn't ......" Deng Shan looked at the other side, and couldn't help but think of the day before yesterday, when he was on the deck of Ruan Jinzao's boat, but he was shaken into the sea by a huge wave, and a salty smell immediately surged in his mouth.

He patted Sun Qi with palpitations, "Mazi, are we really going to take a boat to the north shore?" ”

"You're not talking nonsense, the new city is north of Qiantang, but how can you attack Jiang?"

"Eh, I heard that Zheng Zhilong, that old thief, brought more than 600 warships to the captivity." Deng Shan lowered his voice and said, "Among them, there are forty or fifty big boats that are taller than the house.

"Just rely on the little family background of our sailors, in case, I said, in case, we haven't fought hard to build a captive, then wouldn't we be trapped on the north shore and end up in the same situation as Ma Degong some time ago......"

"As far as you know." Sun Qi glanced at him, "His Royal Highness the Auxiliary King said that he missed it?" Since he said that there is no problem, then it should be ......," he said and couldn't help but pause, "but then again, it's not appropriate to do nothing on the south coast." In case, I said in case, the northward advance is not smooth, we at least have room for maneuver, right? ”

"That's right, especially when the sailor can't stand Zheng Zhilong, you say ......"

As Deng Shan was talking, he heard Sun Qi cough exaggeratedly. He turned his head in wonder and said, "Mazi, what are you doing...... Eh, isn't this General Nguyen? Hehe, this, just now, you didn't hear me say that the water master or something, right? ”

Since King Lu abdicated and returned to the domain, the original Zhejiang Water Division was officially incorporated into the Daming Water Division. And Ruan Jin and several others were recommended by Zheng Chenggong to join the newly built Qiantang Water Division because they were familiar with water warfare.

Nguyen Jin himself was also approved by the Auxiliary Prince, awarded the rank of guerrilla general, and assisted Luo Minh to command the Qiantang Water Division. In fact, according to Zhu Linmiao's meaning, Ruan Jin and other Zhejiang officers and soldiers should first enter the Sailor Academy for further study before serving, but now that the war is urgent, they can only make an exception for the time being.

"Of course I heard it." Ruan Jin nodded.

Deng Shan blushed, and hurriedly explained, "That, I'm not saying that the sailor can't work, I mean the sailor's warship can't work, no, it's not that the warship can't work, it's ......"

Ruan Jin raised his hand to interrupt him, and sighed: "General Deng is right, the sailor is indeed not good.

"Don't say that you are an infantry army, even the sailor himself doesn't believe that he can win against Zheng Zhilong."

Deng Shan thought that Ruan Jin was talking the opposite, and he was so anxious that he wanted to slap his mouth, but he heard Ruan Jin answer: "Even if the main warships of the Navy Division are now in Qiantang, with the power of the cannons carried by Shao Wu and other ships, they may be able to achieve a small victory locally." But there were more than 600 enemy ships, including nearly 50 large ships with more than 1,000 materials! Once the war starts, our sailors will be surrounded by many people. In a confrontation at sea, if you lose the ability to move, no matter how many cannons you have, you will not be able to escape.

"What's more, Lord Admiral has led more than 30 warships with the strongest combat power to leave Qiantang for many days, and now there are only about 70 ships here, and there are only five big ships, how can Zheng Zhilong be menacing......

"You said that Admiral Zhu left Qiantang with thirty boats?!" Sun Qi was shocked when he heard this, "His Royal Highness the Auxiliary King ordered me to board a ship tomorrow to attack the north shore, how can he ...... at this juncture?"

When he said this, he glanced at Deng Shan, and exclaimed: "Isn't Admiral Zhu cowardly and running away?!" ”

"Hugh is going to talk nonsense!" A coquettish voice came from behind the three of them, "Carefully, I will cure you for the crime of disturbing the morale of the army!" ”

Deng Shan and the others looked back, but saw Zhen Zhen coming with a few guards, and hurriedly saluted: "I've seen the general." ”

Sun Qi smiled again: "The general is too serious, let's just discuss the battle situation." ”

Deng Shan was straightforward, "General, you said, how can I fall to the bottom in my heart in the case of the water master......

Zhen Zhenliu frowned slightly, and said seriously: "This time I crossed the river to the north, but you are not the only one. I will personally lead 3,000 men and horses to attack Fuyang, and 3,000 men and horses under Yu Shilang will attack Jiaxing, and His Royal Highness will personally conquer Songjiang Mansion.

"That is to say, the main force of our army will be fully spread along the Qiantang line and fight a decisive battle with the captives. His Royal Highness has always been cautious and serious, and has never had a bad pool. With such a large formation and tens of thousands of troops invested, if His Highness is not completely sure, he will never put us in danger. ”

Seeing that Deng Shan was still puzzled, she continued: "Let me ask you, since Your Highness started his army in Fuzhou, has he missed the enemy once?" ”

"It's not ......" Deng Shan hesitated for a moment, and finally gritted his teeth and said, "Damn it!" Afraid of a ball! Lao Tzu threw himself into the captivity camp just to kill Jiannu, so he didn't plan to live! Tomorrow, if you can kill a few more Tartars in the new city, you will earn it! ”

Zhen Zhen smiled and patted him, "This is like the big brother Deng I know." ”

Although she was going around to boost morale, she was actually quite bottomless in her heart, after all, Zheng Zhilong's fleet was too powerful. She was completely out of trust in His Royal Highness the Vice-Chancellor, so she was so obligating.

It is said that Zhu Linwei did have a very prudent strategy to ensure that the Qiantang River was controlled by the Ming army, but he could not tell his officers the details.

He also wanted to reassure them, but the stakes were high, if someone accidentally leaked the news, Jianyu would definitely take precautions in advance, and the sailor's side would also be in danger.