The Flowu Island steelworks use the graphite crucible method, which removes oxygen from the steel, and also removes various inclusions from the liquid steel.

This steelmaking method produces steel of the best quality in the mid-19th century, and can even be used to make tools for processing metallic materials.

This is the first method of producing liquid steel in the history of mankind!

However, this production method makes its output small and costly------ especially since Wang Defa's family also uses a lot of coke and gas technology.

The concept of cost is not important in his eyes, that is what Zhang Dao mainly considers, and Wang Defa's family only cares about whether there is a problem.

He can scale up steelmaking for as long as he needs to.

The high-quality graphite from the Goryeo Kingdom provided him with the possibility of willful development.

Although the production of tool steels is small and costly, it still greatly improves the machining capacity of Liuqiu Island, which also makes their tool products legendary.

A hacksaw can be sold for twenty times more than the price produced in the Great Song Dynasty!

Some generals specially wanted to go to Liuqiu Island to order "treasure swords", and they were willing to pay a high price.

Of course, these are not worth mentioning in the eyes of Wang Defa's family.

As the scale grew, so did the production of high-quality steel.

It was only at this time that Wang Defa's family considered the finalization of the Type 08 artillery.

He didn't have time to design any new artillery, that is, he combined the cannon steel that could be processed now with the process technology that could be done, and made whatever he could.

In terms of the gun body, he directly used the method of adding steel hoops to improve the strength.

The locking method of the breech directly uses a screw locking machine and a compression plug is used.

He had experimented in advance that this gun door technology could better seal the tail of the gun, and could fully withstand the huge pressure of gunpowder gas on the bottom of the bore, so as to achieve the purpose of increasing the firing range of the gun.

He finally gave up the rack retreat method, the gun carriage was too bulky, not to mention, the firing speed and accuracy were too affected.

He decided to install a buffer between the barrel and the base to reduce the force on the gun mount when firing.

After testing, he directly chose the water-pressure gas brake.

The reason is simple, the accuracy requirements of this brake do not exceed the level of the pot camel vapor machine.

This kind of system retreat and re-entry machine is divided into two parts: system and re-entry.

When the gun is fired, the gun body drives the recoiling tube to retreat, and the liquid at one end of the piston flows from the leak to the other end due to pressure, and the liquid at this time the liquid occurs a resistance to slowly stop the recoiling of the gun.

The recoiler uses gas to absorb a part of the recoil, and when the recoil ends, the compressed gas pushes the recoil back into place due to its extension.

In this way, through the intermediary of the retraction and retractor, the barrel and the gun carriage are elastically connected, which is conducive to reducing the weight of the gun and creating conditions for increasing the firing speed.

The emergence of this kind of retractor is far more significant than gun rifling and gun rifling.

The caliber of the Type 80 artillery is determined by the size of the shell------ Wang Defa directly chose the 100 mm caliber.

The reason is also very simple, with the current machining technology of Liuqiu Island, they are difficult to achieve in terms of extremely small size or great technical requirements.

For example, they can't make a watch that can be worn on the wrist, nor can they make a huge floor clock, but they can still make a small table clock or a pocket watch the size of a palm.

The extrusion dies processed by Wang Defa are between 10 and 100 mm with the highest precision, and can be mass-produced.

The straight body of the cannonball is also made of brass, which not only makes it possible to fully use the characteristics of good ductility, easy processing and rust of copper, but also saves copper.

Insert a word.

The Great Song Dynasty did not know the existence of zinc, and of course they did not understand the smelting technology of brass.

The smelting of zinc, as described above, is an extremely simple process, only slightly more complicated than tin.

This made the copper coins of Liuqiu Island take a big advantage------ and the owner of Zhang Island once ordered to add forty percent zinc to the copper coins!

Even with such a high proportion, its copper color is better than that of the Great Song Dynasty coinage when lead and tin were added to it, and it will not turn blue, and the copper coins of Liuqiu Island are stamped and the image is exquisite.

If you add a little tin to the brass, you can greatly improve the corrosion resistance of brass, which is far more durable than bronze.

Of course, when Wang Defa made the bullet body, only 30% zinc was added, which could ensure that the plasticity of copper was good and suitable for cold and hot pressure processing.

The warhead is of circular cast iron, wrapped with brass tape, filled with yellow explosives and a certain amount of zinc powder, and uses a compound fuse.

The propellant and primer in the cartridge are similar to those of the Type 80 rifle, except with the addition of paraffin wax to protect against moisture.

The data of the 80 model gun is as follows.

Caliber: 100 mm

Gun length: 2.5 m

Gun body width: 2 meters

Height: 1.88 meters

Total weight: about 3 tons

Gun pitch angle: 0 degrees - +30 degrees

Artillery firing range: plus or minus 30 degrees from left to right

Maximum rate of fire: 3 rounds per min

Initial velocity: 340 m/s

Maximum range: 4000 meters

Maximum firing range: 10675 meters

Cannonball:

Initial velocity of discharge: 340 m/s

Shell weight: 15 kg

Shell propellant weight: 1.5 kg

Yellow explosives: 1 kg

Zhang Island Master looked around the sample cannon and said, "This cannon is too thick, right?" ”

Wang Defa said helplessly: "We want to use seamless steel pipes------ we can only use cast steel, which is quite strong." ”

"So is this a howitzer or a cannon?"

"Eight hundred meters is counted as a cannon, which can fire armor-piercing shells; Howitzer ------"

Hehe, the two laughed together, why is the level of artillery in this era so clear!

Their breech-loading bronze cannons are invincible.

In fact, this development may be a way to test the level of metal materials and machining capabilities that Liuqiu Island has developed to the present!

The results are pretty good, right?

However, they are not in a hurry to change clothes, and they are slowly producing in advance, accumulating inventory, and they don't see any urgent needs at present.

Zhang Daozhu and Wang Defa's family prepared to start organizing an operation to beg for the discharge of naval and army members.

At the moment, they have recruited about 40,000 regular troops, which now seems too large, and most of them are concentrated in the Shandong region, where they are training, all day.

This time, they are going to let 20,000 people retire in advance and replenish 10,000 new soldiers, so that 10,000 will be disarmed.

Those veterans, Zhang Daozhu and Wang Defa's family will never let them casually return to the people to fend for themselves------ during their training, they almost all go through the process of supporting workers and farmers, and go through strict discipline training, with obedience and organizational ability, they can be regarded as compound talents.

Especially the squad leaders, sub-captains and squadron leaders among them, they are definitely management talents.

Perhaps this is an opportunity to adjust the form of social organization on the island.

These 20,000 people will be staunch supporters of the ideology of the Flowing Society!