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Yan Xueyi told Chang Yuxin about his marriage to Cao Wenbin, Chang Yuxin thought for a while, and then thought of several suitable candidates, Yan Xueyi and Chang Yuxin discussed it, and finally selected Chang Yuxin's 16-year-old distant cousin Chang Lingwei, although it was a marriage, but before the marriage, Yan Xueyi would let the two parties meet a few times to see if the two were compatible. Pen % fun % Pavilion www.biquge.info

Later, under Chang Yuxin's arrangement, Cao Wenbin and Chang Lingwei met a few times, and both parties felt okay, so Yan Xueyi officially married Cao Wenbin Chang Lingwei and got married on an auspicious day, and the families of both parties were also busy because of Yan Xueyi's marriage.

Just entered May, the Yuanhe City Arsenal came to the good news, two large-caliber artillery has been successfully developed, one is a 120 mm cannon, the other is a 150 mm howitzer, before the Yuanhe City Arsenal has developed a 100 mm cannon and a 105 mm light howitzer.

The 100 mm cannon was the first to equip the Han army, as early as the Manchu Qing Dynasty Fifth Route Army encircled and suppressed the four Han Dynasty when it appeared on the stage, the power and range far exceeded the 75 mm field gun's 100 mm cannon, the Manchu Qing Second Route Army that wanted to enter the hinterland of the four Han Dynasty was defeated, only a few Qing troops fled, and in this battle, the 75 mm field gun did not play a big role.

In fact, the 100-mm cannon produced at that time was also a substandard product, and the estimated barrel life was only about 300 rounds, while the normal barrel life of the designed 100-mm cannon should be more than 700 rounds.

The reason for this is that the quality of the barrel is not up to par, or more precisely, the steel used to cast the barrel is not up to par.

The material of the barrel is very important, because the barrel is subjected to extremely high instantaneous pressure and temperature when the gun is fired, so the material requirements for the barrel are very high, and only high-strength alloy steel with trace elements such as carbon, nickel, chromium, platinum and other trace elements can meet the requirements.

If you use ordinary steel (such as steel for railroad tracks) to cast the barrel, you can also use it, but the life of the barrel will be very short, but in times of crisis, it is good to have ordinary steel to cast the barrel, how can there be so many options.

In addition, the life of the barrel is also related to the type of shell and the range of the gun, the longer the range of the gun, the shorter the life of the barrel, of course, the most important thing is the material of the barrel, only with better materials to cast the barrel, the longer the life of the barrel.

Yuanhe Iron and Steel Plant has a branch that specializes in smelting steel for military use, and the special steel smelted by it is used to cast guns, artillery and even warships.

The 60-mm mortars and 75-mm field guns that the Han army was the first to be equipped with, because the caliber was relatively small, the demand for steel was not too high, so the arsenal was able to quickly manufacture them in batches.

After the 100-mm cannon was manufactured, the steel did not meet the requirements, but because of the war, it had to be manufactured with first-class steel, and after another three months, the steel plant barely produced qualified steel, so that the 100-mm cannon met the original design requirements.

After that, the Han army was reorganized, and to establish a heavy artillery brigade and multiple artillery regiments, various large-caliber artillery were needed, and the barrel steel has always been a key project in the research and development of artillery.

In 84 years, the 105 mm light howitzer was developed, and after various tests, Yan Xueyi approved the mass production of 105 mm light howitzers, which were installed in the Han Army, and the artillery regiments and brigade artillery battalions of each division were equipped with this type of artillery, and the heavy artillery brigade was also equipped with a regiment of this type of artillery, a 105 mm light howitzer regiment was equipped with 36 guns of this type, and an artillery battalion was equipped with 12 guns of this type.

1884 105-mm light howitzer

Caliber: 105 mm

Barrel length: 16 times caliber

High and low shooting boundary: -10 degrees ~ +40 degrees

Horizontal firing boundary: 4 degrees

Projectile weight: 15.7/12.8 kg

Muzzle velocity of ammunition: 302 m / s

Weight: 1090 kg

Maximum range: 5900/7000 meters

As can be seen from the actual tests, although the 75-mm field gun has a relatively fast rate of fire, the 105-mm light howitzer's shell power and range far exceed that of the 75-mm field gun.

In the future, the 105-mm light howitzer will become a sharp weapon to suppress the enemy in large-scale battles at the brigade level of the Han Army, while the 75-mm field gun will gradually be reduced to a regiment-battalion-level infantry support artillery after the 105-mm light howitzer is installed in the troops, and the 75-mm field gun will play a greater role in small-scale battles.

Moreover, the emergence of 105 mm light howitzers made the originally somewhat weak Han army artillery fire surpass the Qing army at once, after all, the Han army, which only had 75 mm field guns and 60 mm mortars, could not even catch up with the Qing army, you must know that the Qing army was equipped with many large-caliber artillery pieces of more than 100 mm.

In addition, the Han army was armed with 100-mm cannons, which were too heavy and inconvenient to transport, so it was good to use them to block the river.

However, the power of the 100-mm cannon was also slightly insufficient, and at the request of the military, the arsenal began to develop a larger caliber cannon, and at the beginning of 85, the 120-mm long-barreled cannon was born.

1885 120-mm long-barreled cannon

Caliber: 120 mm

Barrel length: 40 times caliber

Projectile weight: 21 kg

Rate of launch: 5 rounds / min

Maximum range: 12000 meters

Although the 120 mm cannon is much more powerful and range than the 100 mm cannon, it also makes the weight of the 120 mm cannon heavier than the 100 mm cannon.

It is expected that in a short period of time there will be only two units equipped with 120-mm cannons, one is the newly formed shore artillery unit, which will be equipped with about 30 120-mm cannons, and the other is a heavy artillery brigade, which will be equipped with a regiment of 24 120-mm cannons.

However, one more thing must not be forgotten that in addition to being able to act as a shore gun, the cannon can also be used as a naval gun, and the gunboats that the Yamashiro shipyard is going to build can be equipped with such cannons.

In addition to a 120-mm cannon in 85, another heavy artillery was born, which was the 150-mm heavy field howitzer.

1885 150-mm heavy field howitzer

Caliber: 150 mm

Barrel length: 12 times the caliber

High and low shooting boundary: 0 degrees ~ +42 degrees

Horizontal firing boundary: 4 degrees

Projectile weight: 42 kg

Muzzle velocity of ammunition: 325 m / s

Weight: 2035 kg

Maximum firing range: 7450 meters

A 150-mm howitzer can be considered a real heavy artillery, while a gun with a caliber of less than 150 mm can only be considered a medium artillery.

The 150mm howitzer's shells are far more powerful than the 105mm howitzers, and their weight is not as heavy as that of the cannon, making them a real weapon.

No matter how strong the city wall is, it can't withstand the continuous bombardment of 150mm howitzers, let alone under the bombardment of 150mm howitzers, the enemy will be extremely frightened, and can only hide in the corner and tremble, this is the overwhelming force.

Taking into account the slow pace of manufacture of the 150-mm howitzer, for the time being, it will be equipped with only 24 guns from a regiment of heavy artillery brigades and 12 guns from a battalion of the Janissary Artillery Regiment, which is expected to be completed by mid-86.

Three types of artillery into the Han army sequence, so that the Han army's artillery fire greatly improved, but this is not enough, in the face of the coveted land of the Western powers, the Han army also needs more and more powerful artillery, 200 mm heavy artillery, train guns, 300 mm 400 mm naval guns, will be added to the Han army combat sequence in the future.

(The above three types of artillery prototypes are all German Krupp guns that appeared around 1900)