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After the negotiations, Chen Yuan and the others immediately returned to their temporary station. In the afternoon, the vehicles used to load diesel and chemical raw materials drove to the oil city, along with the materials used for trading.

Du Mei's reputation is indeed good, and the two sides successfully completed the deal without Chen Yuan sending armored vehicles and tank troops to demonstrate.

However, after loading the supplies, it was almost dark, so Chen Yuan did not rush back to the Iron Castle, but returned to the temporary station with the vehicle.

They departed the next morning and made their way back to the Iron Castle in the evening. And the temporary station near the oil city has not been abolished. Li Han and Zhang Liang were left behind, serving as a liaison point with the oil city, while continuing to collect information on other survivor forces near Daqing.

Back to the Iron Castle, there are naturally fat people in charge of arranging the materials. And Chen Yuan ran to the arsenal without stopping.

The deal with Amagi was successfully completed yesterday, and Daharu's daughter-in-law was sent back to the iron ore area. And the most important 100 kg of saltpeter is already in place. The gunpowder production workshop of the arsenal started mass production of smokeless gunpowder yesterday.

However, Mr. Cai, who is in charge of gunpowder production, said in his report yesterday that laboratory manufacturing and industrial production are two different things. Although they had succeeded in manufacturing a small amount of smokeless gunpowder under laboratory conditions, it did not mean that mass production would be an immediate success.

Therefore, Chen Yuan decided to personally inspect the production of gunpowder today. Whether the industrial production of smokeless gunpowder will go smoothly is directly related to their future production of bullets, and also determines how many bullets they can put into each battle in the next winter offensive. It is also related to whether the fighters can let go of their hands and feet and shoot happily.

After all, if bullets can't be mass-produced yet, they can only save as much ammunition as possible.

Fortunately, Chen Yuan came to the arsenal and got good news from Wu Zhiping, the director of the arsenal.

"Chief, the first batch of 20 kilograms of smokeless gunpowder for trial production has been successfully made, and the quality meets the requirements. The second batch of 50 kilograms of gunpowder will also go into production tomorrow. If the second batch of further trials is successful. Then we will be able to produce 50 kilograms of gunpowder a day for two days in the future. ”

"Great." Chen Yuan breathed a sigh of relief, as long as smokeless gunpowder could be manufactured smoothly. Everything else is easy to do.

In the past few days, they have produced a batch of about 30,000 rounds of 5.8 mm caliber bullet casings in advance. More than 50,000 rounds of 7.62 mm and 12.7 mm cartridges were also brought back from the arsenal. These bullets have been dismantled and discarded with expired gunpowder, and can now be used again as long as they are filled with new gunpowder.

So Chen Yuan also asked at the same time: "Director Wu, how much ammunition can be filled with 50 kilograms of smokeless gunpowder produced every day?" ”

Wu Zhiping naturally memorized these data, and replied: "The propellant that needs to be loaded with a 5.8 mm caliber bullet is about 1.8 grams, a 7.62 mm bullet is 3 grams, and a 12.7 mm bullet is 17 grams. If we only produce 5.8mm rifle bullets, we can produce enough gunpowder every two days to fill 27,000 rounds. Only 7.62 mm bullets can be produced, which can produce 16,000 rounds. 2,900 rounds of 12.7 mm caliber ammunition were produced. With the first batch of gunpowder, we are now prioritizing the production of 5.8mm rounds, which can produce about 1,000 rounds per hour. Time was tight, so I would have the workers take turns in three shifts. Using up the existing 25 kilograms of gunpowder would produce about 14,000 rounds of ammunition. Throw yourself into the next winter offensive. ”

At the same time, he added: "In addition, many of the various types of artillery shells brought back from the arsenal have expired gunpowder and are waiting to be reloaded. The charge of mortar shells is 0.9 kg, and the loading capacity of 122 mm caliber shells is 5.2 kg. If you want to load these shells, you can't produce much. ”

"5.2 kg! Oh my God, then we can't make even 10 shells of gunpowder every two days! Chen Yuan yelled in disbelief. He wasn't yelling at Wu Zhiping, but he was really surprised.

Hearing about a day's gunpowder productivity can load 27,000 rounds of 5.8mm rounds. Chen Yuan is still beautiful. This means that they don't have to worry about running out of bullets in their assault rifles in the future.

But knowing that the amount of gunpowder in a day could only make less than 3,000 rounds of 12.7 mm caliber bullets, Chen Yuan frowned. Because heavy machine guns use 12.7mm bullets. This is a big consumer of ammunition, and if you pull the trigger casually, several or even a dozen rounds of ammunition will be gone.

Hearing the amount of gunpowder used in the shells, Chen Yuan took a breath of cold air, thinking that it might take a lot of gunpowder to load the shells, but he didn't expect that there would be so much.

"Yes." Wu Zhiping nodded helplessly.

Chen Yuan asked, "Can we expand the production of smokeless gunpowder?" They can now dig 280 tons of saltpeter ore per week, not taking into account the production of fertilizers, if all of them are used to make saltpeter, they should be able to extract 8 tons of saltpeter, right? They don't use much on their own, and if we buy all this saltpeter, will we be able to increase our weekly production of smokeless gunpowder? ”

Wu Zhiping replied: "Fort, there is no way, what we lack now is not saltpeter, but sulfur." The iron ore in Zhangjiaba is hematite, which has little sulfur content and is not easy to extract, and the amount that can be extracted every day is only enough for us to produce 50 kilograms of gunpowder. In addition, as far as I know, there is not such a large production of saltpeter on the Amagi side. The factory they mastered was for chemical fertilizer, and the original equipment for extracting saltpeter could only produce a small amount of low-purity saltpeter. Although they have already modified the equipment for extracting saltpeter, they can only extract about 100 kilograms of saltpeter with relatively high purity per day. It may be able to increase slowly in the future, but it is not expected to increase very quickly, after all, the equipment is relatively difficult to get now. ”

"I see." Chen Yuan smiled bitterly: "But it's not bad that they can produce 100 kilograms of saltpeter every day, and if they can make a lot of gunpowder, at least it's enough to make bullets." In this way, we will not be in a hurry to reload the shells first, and first use the arsenal to bring back those that can be used, and a few thousand rounds will at least be enough for us to fight for a while. Also, it looks like it's time to go find the Brimstone Mine! ”

"Not only sulfur ore, but also pyrite."

"What is pyrite?" Chen Yuan asked suspiciously.

"This is an iron ore with a relatively high sulphur content, and unlike hematite, it is yellow. The sulfur content is generally more than 30%, and pyrite is used to make sulfuric acid in industry. ”

"Okay, I'll make a note of it."

After chatting with Wu Zhiping for a while, Chen Yuan saw that it was already dark, so he left the arsenal. There is another day, the winter offensive is about to begin, and there is still a lot to prepare.

But it seems that the heavens played a little joke on them, and from this night onwards, it gradually began to snow in the sky! The temperature also plummeted to minus 13 degrees Celsius.