The kiln mill now produces two types of cast iron.

The first is ordinary cast iron, which is refined in a reverberatory furnace. This kind of cast iron has a wide range of uses, and it can be seen in later generations: all kinds of cast iron water pipes, railings, pedestals, manhole covers, gates, in short, all the clumsy and cheap objects, just use it.

For a long time, ordinary cast iron has been the main project of steel mills, once accounting for more than 80% of the total product.

Now, with the success of more advanced ductile iron, the output of ordinary cast iron has slowly retreated to 60, and the rest of the share has been given to steel and ductile iron.

Ductile iron is a high-strength cast iron material. Different from ordinary gray and white cast iron, ductile iron needs to be spheroidized and inoculated to obtain spheroidal graphite through the process of spheroidization and inoculation treatment before this product can be made.

The ductile iron, whose comprehensive properties are close to steel, can be used to cast some parts with complex stress and high requirements for strength, toughness and wear resistance based on its excellent properties. The so-called "iron instead of steel" mainly refers to ductile iron.

In fact, ductile iron is much more useful than steel when it comes to casting and machining. You must know that the fluidity of steel is very poor, and the casting is very difficult; Due to its excellent plasticity and toughness, ductile iron is the real star, at least in the plane of traversal.

For example, in a wood gas engine system, in addition to the thin iron plate used for the chassis shell, the key parts including various mechanical crankshafts, camshafts, connecting shafts, connecting rods, gears, clutch plates, cylinder blocks, etc., are actually made of ductile iron.

Even in later engines, there were still many parts made of ductile iron. The material can be cast, forged, and cut. It is this new material that is now at the top of the food chain in the field of machining and casting.

In the past, steel mills were unable to produce ductile iron, not because of how difficult it was to smelt, at least because it was easier to make steel. The crux of the problem is that the nodularizer is not in place.

When ductile iron is inoculated in the furnace, it is necessary to add nodularizing agent. The main material in the nodularizing agent is magnesium, or pure magnesium can be used directly.

Therefore, industry is interlinked.

The prerequisite for nodularizing agents is a chemical plant. With a chemical plant and stable hydrochloric acid, enough magnesium metal can be produced as a nodularizing agent in conjunction with the electrolysis process and the seawater magnesium extraction process.

That's why ductile iron can only strike later: the preconditions are not in place. Once all the conditions are met, the output of ductile iron will grow quite rapidly. After all, this is only a kind of cast iron, and the difficulty of smelting will definitely not exceed that of steelmaking.

When steel mills can mass-produce this widely used cast iron, the demand for steel in the crossing country is suddenly much smaller, which also relieves a lot of pressure on steel mills. After all, steelmaking is the highest cost in every way.

In this way, the product line is well adjusted. A series of steel processing projects that were originally intended to be gritted can now be suspended, and the mill only needs to further improve the rebar and wire production lines: these are the only two varieties that cannot be replaced by other materials.

As for the future, the Industrial Party still has no ambitions when it comes to steel: tinplate and galvanized iron are the highest technology trees to climb in the next three years.

Tinplate can be used for canning, and galvanized iron sheet, also known as white iron sheet, is an excellent container material, such as iron buckets and chimneys.

Both of these materials require the same substrate, which is a low-carbon thin steel plate. To produce thin steel plates with a thickness of only about 02, the current steel mills are not able to catch it. This will have to be accumulated for a while - the cold-rolled steel production line is huge in size, high in technology, and cannot be produced by the kiln area.

Fortunately, the demand for tinplate by a certain force will not be urgent for a while.

Canned food is mainly used for attack: when soldiers are in a field state without logistics, canned food is a big killer.

However, if you look at the big picture, you will find that all the battles of the current crossing forces are taking place along the coast. Whether it is a naval battle or a land battle, the soldiers under the command of the "guerrilla generals" who have entered the Ming system can get sufficient logistics supplies on the battlefield, and there will be no lone army running thousands of miles to attack this kind of bridge, so the luxury of canned food can be said slowly.

That's the product structure of the steel mill. For a long time to come, the share of cast iron, ductile iron and steel production will be fixed at 50:30:20, and it will be difficult to change this ratio even if the steel mill is expanded in the future.

After the inspection of the core steel mill and machinery factory in the entire kiln area, Yao Zhesheng and Zou Guoqing parted ways. Yao Zhesheng continued to work as an inspector at the power plant, while Zou Guoqing went back to his home to work - there was a place for him in the office of the bigwig on the second floor of the imperial city.

With a "bang", Yu Sibao got out of the clear and transparent water. The young man didn't bother to wipe his face with the water flowing all over his face, but screamed and waved his hands on the surface of the sea and swam towards a fishing boat not far away.

When he came to the fishing boat, Yu Sibao first threw the things in his hand onto the boat, and then jumped onto the side of the boat like a tanuki along a hanging hemp rope.

Several fishermen on the boat were meeting heads to study the objects thrown by the young men. A tall, red-faced man in his 40s held a coarse cloth robe, and as soon as the young man jumped on the boat, he hurriedly wrapped his son's body in the robe: "Be careful, don't catch a cold." ”

This man is Yu Sibao's father, named Yu Chengde.

The Yu family is an ordinary fisherman along the coast of Putian, and Yu Chengde is the owner of the broken fishing boat at his feet. The fishing boat, called the Herring, has 200 ingredients, and the fishermen on board are all from the same fishing village.

And the location where the Blue Fish is anchored at the moment is the shore of Cormorant Island, where the task force and Zheng Zhilong's fleet fought that day.

What was thrown onto the ship by Yu Sibao was a military thorn produced in the kiln machinery factory. This military spur is the earliest crude steel military spur produced by the machinery factory, and the style is an imitation of the U.S. Army 9 military spur, but the blade is lengthened on the original basis, and the back teeth are canceled.

And the one who was holding a military thorn that already had rusty spots and was trying the knife on a salted fish was Yu Sibao's cousin: Yu Chushui. After seeing Sibao get on the boat, Yu Chushui shouted to him excitedly: "Sibao, this is a treasure knife!" ”

As he spoke, Yu came out of the water and slashed at the salted fish hanging on the rope, and the salted fish with thick calves broke in response.

"Dad, the ship below must be a cargo ship of maritime merchants, and the ships are full of rich and noble people!" Yu Sibao didn't care about his cousin at this time, only to see him excitedly stretch out a hand from the coarse cloth robe, and in the palm of his hand was a silver ingot weighing about 5 taels that had long been oxidized into black by the seawater. If you want to chat with more like-minded people about "Luming", follow "Hot Network Article or rd444" on WeChat to chat about your favorite books with more book friends