Chu Hao skillfully opened the ultra-small vacuum self-consumable electric arc furnace, poured all the kilograms of titanium raw materials into it, with the sound of the machine starting, it didn't take too long, the electric arc furnace came from a burst of scorching high temperature, the titanium raw materials gradually began to turn red, there were traces of melting, Sun Dan involuntarily took a few steps back, wiped the sweat on his head. Pen "Fun" Pavilion www.biquge.info

And looking at Chu Hao with a focused expression, Tian Jitong suddenly had a bad feeling, Chu Hao was so calm and composed, no matter how he looked at it, it didn't look like the first time to manipulate an electric arc furnace, you must know that not everyone can face a high temperature of more than 4,000 degrees and remain calm.

But no matter what, Tian Jitong wanted to borrow Chu Hao's materials to do his own experiments, but before he could say this, he was already in ashes.

As the steel ingot was melted into molten steel, Chu Hao began the slag making and oxygen blowing operation of the oxygen top blowing converter, which is to generate slag with sufficient fluidity and alkalinity, which can transfer enough oxygen to the metal liquid surface, so as to reduce the sulfur and phosphorus below the upper limit of the planned steel grade, and minimize the amount of splashing and slag spilling when blowing oxygen.

Immediately after the slag is removed, the molten pool is stirred, the phosphorus is dephosphorized, the bottom of the electric furnace is blown, and then the molten steel is transferred to the refining furnace, and Chu Hao begins to add rare earths and go through refining.

There are two types of refining, primary refining and refining. 、

Primary refining is the melting, dephosphorization, decarburization and main alloying of the charge in an oxidizing atmosphere.

Refining is to degass, deoxygenate and desulfurize the preliminarily refined molten steel in a vacuum, inert gas or reducing atmosphere container, remove inclusions and fine-tune the composition.

The benefits of splitting steelmaking into two steps are improved steel quality, shorter smelting times, simplified processes, and lower production costs.

With the addition of rare earth elements, the molten pool stirring begins again, and various impurities are discharged.

The fiery red light shone on the faces of the three of them, their expressions were different, Sun Dan glanced at Chu Hao without trying, her eyes were shocked and incredulous, she couldn't imagine that Chu Hao, a high school student, was so familiar with steelmaking, just like a steelmaking worker who had been in a steelmaking plant for decades.

But Tian Jitong's face became more and more ugly, in addition to being surprised, he was ashamed and annoyed, and every time Chu Hao made a familiar move, it was like a slap in his face, and it hurt hotly.

When did a high school student become so familiar with steelmaking, when he thought of his clumsy movements when making steel, and the scene of his mentor and senior brother reprimanding, Tian Jitong's face felt even more painful, if it wasn't for his face, he would have turned around and left, and he wouldn't have stayed here to death.

With the stirring of the molten steel, Chu Hao's heart gradually became excited, and he was about to be able to feed the ladle wire, which refers to feeding the powder of deoxidation, desulfurization and fine-tuning components wrapped in iron sheets, such as Ca-Si powder, or directly feeding aluminum wire, carbon wire and other methods for deep desulfurization and calcium treatment of molten steel and fine-tuning of carbon and aluminum components in steel. It also has the function of cleaning molten steel and improving the morphology of non-metallic inclusions.

Chu Hao looked at his watch, it was only more than half an hour, this is because the steelmaking furnace is cold, and it takes a lot of time in the heating process, and it takes more than 20 minutes to make steel.

After the stirring was completed, Chu Hao poured the molten steel into the abrasive, and then put the titanium raw materials into the vacuum self-consumable electric arc furnace non-stop, and then repeated the previous action again, but when adding rare earths, the formula of rare earths was changed a little.

At this time, the molten steel from the last steelmaking had been formed, and the temperature had dropped to more than 700 degrees, Chu Hao poured it out of the grinding tool, put it into the cooling pool, and began to cool it with special water.

Under Chu Hao's operation, pieces of titanium raw materials became titanium alloys.

"Goo!"

With an exceptionally incongruous belly roar, the trio suddenly broke away from the steelmaking.

"It's all going to be like this, my fault, my fault, before I knew it, it was past one o'clock at noon, I tested the first piece of titanium, and we went to dinner. Chu Hao hurriedly confessed.

Hearing this, Sun Dan's face turned red, and the belly roar just now was made by her, "It's okay, I didn't expect Chu Hao that you can also make steel, this is incredible." ”

Tian Jitong on the side heard this, and couldn't help but light up his eyes, by the way, the steel has not been tested for various properties, not to mention whether it can achieve the experimental goal, if the scrap steel is smelted, it will be laughing.

If the impurities in steelmaking are not properly treated, it is waste and needs to be remelted.

The main impurities in molten steel are phosphorus and sulfur, so it is necessary to add dephosphorization and desulfurization powder. If the phosphorus content is high, the steel has high cold brittleness, and when the sulfur content is high, the steel will have hot brittleness, that is, the impact resistance value of the steel at higher temperatures is significantly reduced.

Moreover, as an alloy steel, because it is difficult to refine, the formula is slightly wrong, and various mechanical properties and processing and shaping will be a mess.

However, researchers do not have any formulas for experiments, and they only do experiments to find out the formula, so the steel smelted is unusable nine times out of ten.

No way, steelmaking needs to add too many materials, even if a few ten-thousandths of a change will be another ghost to know, such as the most commonly used carbon steel, No. 45 steel is a steel with a carbon content of 45/10,000, and 50 steel is a steel with a carbon content of 50/10,000, just a difference of five ten-thousandths, these are two kinds of steel.

For example, 40 steel and 40 chromium steel, the difference is that a trace amount of chromium is added, and one is not added, but it is very different, the former has a tensile strength greater than or equal to 570σb/mpa, and a yield strength greater than or equal to 335σb/mpa, while the latter has a tensile strength greater than or equal to 980σb/mpa, and a yield strength greater than or equal to 785σb/mpa, and the mechanical properties of the latter are much better than the former.

This is also why the input of raw materials is large, the effect is slow, even if there is no result, it is an extremely common thing, and it is a strange thing to have results.

"There's no need for testing, it's all unqualified anyway, you can finish it all, and then you can test it. Tian Jitong said with a sneer.

Smelting qualified steel, this is a gradual exploration process, the first smelting must be scrap steel, he used to make steel, are all together to test it, and then record the data, and it is over.

He was afraid that as soon as Chu Hao tested it, the mechanical properties would be a mess, not to mention, and there were a large number of impurities, the blow would be too big, and he would no longer make steel, so wouldn't his wish to let Chu Hao waste all the 10,000 yuan here would not be finished, so he would say this, no matter what, he would let Chu Hao's money go down the drain.

"Senior Brother Tian, if you smelt scrap steel, it doesn't mean that I will also smelt scrap steel, you must know that I can do these things when I was in high school, you are afraid that you can do it just two years ago, and it is not necessarily better than me, you still honestly watch from the sidelines, don't interject." Chu Hao glanced at Tian Ji and started the test in his own hand by himself.