In order to increase grain reserves in case of disaster years, wars, and famines, Xia Xue built many new grain warehouses according to the grain reserve methods of later generations, and sent heavy troops to protect them.

In order to build these warehouses more conducive to long-term storage of grain, insect-proof, rodent-proof, rain-proof, fire-proof, moisture-proof, mildew-proof, etc., and in order to build warehouses more solid, durable, and tightly defended, Xia Xue had to build several new cement factories to produce cement, concrete, etc., which are commonly used building materials in the future era.

The good thing about cement production is that the technology is relatively simple, with limestone and clay as the main raw materials, crushing, batching, and grinding to make raw meal, and then feeding into the cement kiln to calcine the mature material, and then adding an appropriate amount of gypsum to grind the clinker. With cement, there is concrete.

In ancient Sui Dynasty, the building cementitious material was mainly glutinous rice lime mortar. Glutinous rice lime slurry is a masonry structural adhesive mixed with glutinous rice juice and lime slurry. The preparation method is: add a wooden barrel to the iron pot, put glutinous rice and water, simmer the glutinous rice into juice with a simmer, and stir it with a rake at any time to not stagnate. Use a scoop to check its intensity, take it out and store it in a clay jar for later use. Mixing glutinous rice juice with lime slurry is called pair pulp. The method is: the lime is dissolved with water, so that it dissolves evenly, removes impurities, and then mixes it with glutinous rice juice, mixes and stirs.

Glutinous rice lime pulp not only has a small yield, but also wastes glutinous rice and other food resources, of course. Xia Xue produced the commonly used building cementitious material cement in later generations, which is not only rich in raw materials, large in output, more solid and strong, but also not afraid of water, and also needs to be used in the construction of salt pan ponds, including the construction of reservoirs, dams, river embankments, canals, houses, roads, cities, factories, etc., so the construction of cement plants Xia Xue is almost synchronous with the construction of salt ponds.

The construction of various construction facilities also requires a large amount of steel and steel, so the construction of large-scale new technology steelmaking plants is also stepping up at the same time.

In view of the fact that the industrial science and technology in the last years of the Sui Dynasty were very backward and the foundation was too poor, those future automation technology, artificial intelligence, nanotechnology, gene technology, quantum technology, aerospace technology, nuclear energy technology and other high-tech technologies did not need to be considered at all, Xia Xue could only first establish a basic industrial foundation according to the actual situation according to some relatively crude and backward industrial technologies of the 18th, 19th, and 20th centuries as a reference. Fortunately, Xia Xue is a "scholar", in addition to majoring in chemistry and biology, she has also studied in-depth science and technology development, industrial manufacturing, chemical experiments, physical engineering, etc.

Steelmaking technology, because the Sui Dynasty had no electricity, no automatic control, can only refer to the eighteenth, nineteenth, twentieth century steelmaking technology, although these steelmaking technologies are still relatively backward compared to the future, but compared to the end of the Sui Dynasty, at that time in the world was the most advanced, the most advanced technology.

At the end of the Sui Dynasty, the main steel-making process was the frying steel method and the steel filling method, followed by the 100-steel making method and the iron-frying carburizing method, which had the following disadvantages: (1) The carbon content was generally low. (2) Carbon distribution is often uneven. (3) There are often more impurities in steel. (4) Productivity is very low.

At that time, the steelmaking technology in Fujian was more backward, and many people put the iron ore in a simple fire pit, and the charcoal was burned and heated to heat up, and the temperature obtained was below the liquefaction point of the iron, and the iron contained slag in the product, and then the slag in the iron block was extruded by forging and forged into a block of iron. This kind of semi-condensate solid-state smelting is not only extremely inefficient, labor-intensive, but also of poor quality of wrought iron.

In order to improve the efficiency and quality of ironmaking, in order to obtain liquid molten iron, it is necessary to increase the temperature of the furnace, and if you want to increase the furnace temperature, you need to increase the height of the furnace, so Xia Xue first needs to build an ironmaking blast furnace. After research, the iron-making blast furnace body designed by Xia Xue is divided into five parts: throat, body, waist, belly and cylinder.

The furnace is high, the resistance of the material layer in the furnace to the air circulation increases, so it is necessary to force the air to blow into the furnace, although there is no electricity at this time, but because the water power in Fujian is very rich, Xia Xue designed the way to use water power to blow the air.

In this way, molten iron is obtained. Since this method requires the use of a large amount of charcoal as a reducing agent and fuel, in order to prevent the depletion of the forest, a large amount of wood is required to vigorously develop and build naval warships and maritime trading cargo ships after the summer snow. Therefore, Xia Xue decided to switch to coke as a fuel for steelmaking, anyway, the angel country is rich in coal resources.

Coke is made by heating bituminous coal to 950-1050 °C under the condition of air isolation, and finally made after drying, pyrolysis, melting, bonding, solidification, shrinkage and other stages, with higher calorific value, and also plays the role of reducing agent, heating agent and material column skeleton, which is more suitable for blast furnace ironmaking.

Xia Xue's decision to use coke instead of charcoal in the ironmaking blast furnace laid the foundation for the large-scale blast furnace, which can be said to be a major milestone in the history of ancient metallurgy.

In the production of blast furnaces, iron ore, coke, and slag fluxes (limestone) are loaded from the top of the furnace, and preheated air is blown from the air outlet located at the lower part of the furnace along the furnace perimeter. At high temperatures, the carbon in the coke is combined with the carbon monoxide produced by the combustion of oxygen in the air, and the oxygen in the iron ore is removed during the rise in the furnace, so as to reduce the iron to obtain iron. The molten iron is released from the iron mouth. The non-reducing impurities in the iron ore combine with fluxes such as limestone to form slag, which is discharged from the slag port. The gas produced is exported from the top of the furnace and used as fuel for hot blast stoves, heating furnaces, coke ovens, boilers, etc. after dust removal.

Due to the advantages of good technical and economic indicators of blast furnace ironmaking, simple process, large production capacity, high labor production efficiency and low energy consumption, the blast furnace coke ironmaking technology invented by Xia Xue is very different from the original small workshop ironmaking technology of the Sui Dynasty in terms of scale, productivity and equipment conditions. After the construction of the blast furnace ironworks, the efficiency and quality of iron ore smelting in the angel country have been greatly improved, and the total amount of pig iron produced every day is almost hundreds of times that of the original technology.

Pig iron is an iron-carbon alloy with a carbon content greater than 2%, and the pig iron performance is hard, pressure-resistant, wear-resistant, and good castability, but the pig iron is brittle and cannot be forged. Therefore, for other more uses, most of the pig iron needs to be further refined into steel and wrought iron.

Wrought iron is a relatively pure iron refined from pig iron. The carbon content is less than 0.02%, also known as wrought iron and pure iron. Wrought iron is very soft, plastic, malleable, can be drawn into wire, has low strength and hardness, and is easy to forge and weld.

Steel is an iron-carbon alloy with a carbon content between 0.04% and 2.3%. It is often referred to as steel in combination with iron, and in order to ensure its toughness and plasticity, the carbon content generally does not exceed 1.7%. Steel is generally divided into carbon steel and alloy steel. Carbon steel is the most commonly used ordinary steel, and according to the different carbon content, carbon steel is divided into low carbon steel, medium carbon steel and high carbon steel. With the increase of carbon content, the hardness of carbon steel increases and the toughness decreases. Alloy steel, also known as special steel, adds one or more alloying elements on the basis of carbon steel to change the microstructure and properties of steel, so as to have some special properties, such as high hardness, high wear resistance, high toughness, corrosion resistance and so on.

For further refining pig iron into steel and wrought iron, Xia Xue reformed the ancient steelmaking technology and equipment.

Xia Xue knew that if air or oxygen was blown into a sufficient amount of molten iron, then it would cause a strong combustion of the liquid metal, and maintain and raise the temperature, so that the metal would remain liquid without fuel, and remove carbon (partially) and phosphorus and sulfur, turning iron into steel. This is not only efficient, but also saves fuel. So Xia Xue invented converter steelmaking, converter steelmaking only has three stages: 1. Charging; 2. Blowing in oxygen for smelting; 3. Tapping. The procedure is simple and efficient, and the workers are very happy.

However, Xia Xue soon discovered that there was a new problem, the steel smelted by this method was too brittle and would break with a blow, and after analysis, the reason was that the phosphorus content in the ore was high. Most of the iron ore contains relatively high phosphorus, and this method is limited to blowing pig iron with less phosphorus.

After careful research, Xia Xue found that limestone can dephosphorize molten iron, but the original acidic silicic acid lining of the converter must be changed to an alkaline lining. Xia Xue spent half a month in the steelmaking plant to carry out experiments, using alkaline refractory bricks to lining, and adding limestone at the same time as blasting in the converter smelting process to make the slag highly alkaline, and the result was a successful smelting of dephosphorized steel.

Since then, the Angel Kingdom has entered the era of large-scale production of molten iron as raw material and efficient refining of molten steel, and the daily production of steel has exceeded the total amount of steel produced by the entire world every day at that time.

Xia Xue built a casting and rolling workshop at the same time as the construction of the steelmaking plant, so that the iron ore entering the ironmaking plant will eventually become a variety of steel products after several processes, and such an assembly line production design greatly improves the production efficiency.

With sufficient steel of various properties as the backing, Xia Xue's confidence increased greatly, and she decided to build more advanced machine tools and equipment to lay the foundation for the processing and production of more advanced and more sophisticated equipment and weapons in the future. A machine tool refers to a machine that manufactures a machine, also known as a machine tool or machine tool. Generally, it is divided into metal cutting machine tools, forging machine tools and woodworking machine tools. All parts with high precision requirements and fine surface roughness requirements generally need to be finally processed by cutting method on the machine tool.

Xia Xue decided to first manufacture ordinary lathes, drilling machines, boring machines, milling machines, planing machines, grinding machines, gear processing machine tools, thread processing machine tools, etc., which do not require too high-tech content.

Those future high-tech machine tools, such as intelligent machine tools, CNC machine tools, etc., she feels that there is no need to think about it at present.

In terms of power, in addition to the use of water power, Xia Xue designed a kind of rotary crankshaft with a foot pedal and a connecting rod, which can store the rotating kinetic energy on the flywheel on the lathe, and developed from the direct rotation of the workpiece to the rotating headbox, which is a chuck used for clamping the workpiece, which not only reduces the labor intensity, but also greatly improves the work efficiency.

Of course, these advanced steel-smelting technologies and forging and processing technologies Xia Xue still adopts strict confidentiality measures, all closed production, all outsiders in the production plant are not allowed to enter, and there is a special security team to patrol and inspect.