As born fittings
• How is born valves
We all know what is fitting, but few of us have seen how it is produced. However, it should be carried out or how much of a fixture as a whole of rolled steel.
But the fittings on Yartsevskaya LPZ - the only products. Because talking about it. The other day I was in Yartsevo on the casting-rolling plant and learned, "as the Steel Was Tempered".
Steel is produced from iron ore or scrap metal. The starting material Yartsevo future steel scrap, or blend. Looking at it hard to believe that this stuff will raznosortnyh quality steel, and even different brands. With the help of an excavator charge is loaded into a special container, which takes the scrap in an electric arc furnace. It contains in itself dozens of tons of metal.
After the filling electrodes in the furnace is lowered, include a high voltage switch and start melting period. The temperature in the furnace reaches 1650 degrees. This is enough to melt anything.
Brief furnace design. Her workspace is bounded above by a domed vault, spherical hearth bottom and the walls at the sides. The refractory hearth brickwork walls and outside enclosed in a metal casing. Accordingly, the electrodes are lowered into the furnace.
Heat - this is the most dramatic phase of steel production. Perhaps what is happening at the time of melting in the oven - is hell. The whole process is accompanied by incredible roar, beating sparks and flame. It is very exciting to! Since the scrap metal can be anything you want, including explosive materials, the process is best observed as far as possible from oven. Closer to the concrete columns, which, if anything, can save a person from the blast.
The resulting mixture contained impurities which float on the surface. Slag is removed through a working window, slag-forming constantly sitting down, during the melting period in order to remove phosphorus from the melt.
then added oxygen and various additives to molten steel. This reduces the carbon content of the steel to homogenize the mixture to accelerate the process and achieve the desired quality of the final product.
After working window control the melting temperature and the chemical composition of the sampled metal.
Let's look out the window:
Somewhere in the Hell's Kitchen ...
The molten steel is poured into the ladle, the crane lifts it for 150 tons.
Blue open drain hole of the distributor. The molten steel is cast in forms, where it is cooled rapidly and begins to solidify, turning into a preform.
The bucket goes to the back of the shop (pictured below, right bucket has not arrived yet), where the remains of hot metal blend in with it. Then he again passes through the shop for a new portion of the steel.
Before rolling the preform is placed in a furnace and heated again at a temperature of over 1000 degrees.
Then, the workpiece is sent to the correct machine, where they are compressed powerful shafts. During this operation, the workpiece acquire the desired shape and size. All this is happening around here:
And a few photos in the industrial-style:
And finally, the finished products.
As I said, now on Yartsevskaya LPZ produces one type of product - fitting. Of different diameters and steel grades. Despite the fact that the winter - not the season for construction, smelting go every day (more precisely, every night when electricity is cheaper). This allows you to save and oven, and work regularly pay salaries. The plant is a state unitary enterprise, and belongs to the Moscow city government.
Currently, the plant - the largest production Yartsevo area and the only one of its kind in the territory of the Smolensk region. According to official data, in the works LPZ 2 thousand. Man.