Best-Selling ROUND BAR to Boston Factories

website:https://www.ydlsteels.com/
Tianjin YDL Steel Co is a subsidiary of Tianjin Bohai Rund Steel Group Co., Ltd. It is a large-scale integrated comprehensive enterprise with a variety of businesses in steel exports and domestic sales, milk powder imports, warehouse processing, logistics, real-estate, auto parts manufacture and cultural media. The Group has now established 9 wholly-owned enterprises with annual sales of 5 billion.

more at https://scitech.quickfound.net/

Footage of steel mill operations, including machining of steel.
Full title: “Industries of the United States: Steel – The Hardest Metal in the World.”
The hardest known metal alloy is Alloy 1090 steel, chemical composition: C=0.90%, Mn=0.75%, P=0.04% max, S=0.05% max .

https://www.substech.com/dokuwiki/doku.php?id=carbon_steel_sae_1090&DokuWiki=7af1ac41a51ceef360ecccd7ccfa05f6

NEW VERSION with improved video & sound: https://www.youtube.com/watch?v=j9GMZ1rYP4g

Public domain film from the Library of Congress Prelinger Archive, slightly cropped to remove uneven edges, with the aspect ratio corrected, and mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and equalization.

https://en.wikipedia.org/wiki/Steel

Steel is an alloy that consists mostly of iron and has a carbon content between 0.2% and 2.1% by weight, depending on the grade. Carbon is the most common alloying material for iron, but various other alloying elements are used, such as manganese, chromium, vanadium, and tungsten. Carbon and other elements act as a hardening agent, preventing dislocations in the iron atom crystal lattice from sliding past one another. Varying the amount of alloying elements and the form of their presence in the steel (solute elements, precipitated phase) controls qualities such as the hardness, ductility, and tensile strength of the resulting steel. Steel with increased carbon content can be made harder and stronger than iron, but such steel is also less ductile than iron.

Alloys with a higher than 2.1% carbon content are known as cast iron because of their lower melting point and good castability.[1] Steel is also distinguishable from wrought iron, which can contain a small amount of carbon, but it is included in the form of slag inclusions. Two distinguishing factors are steel’s increased rust resistance and better weldability.

Though steel had been produced by various inefficient methods long before the Renaissance, its use became more common after more-efficient production methods were devised in the 17th century. With the invention of the Bessemer process in the mid-19th century, steel became an inexpensive mass-produced material. Further refinements in the process, such as basic oxygen steelmaking (BOS), lowered the cost of production while increasing the quality of the metal. Today, steel is one of the most common materials in the world, with more than 1.3 billion tons produced annually. It is a major component in buildings, infrastructure, tools, ships, automobiles, machines, appliances, and weapons. Modern steel is generally identified by various grades defined by assorted standards organizations…

Modern steels are made with varying combinations of alloy metals to fulfill many purposes. Carbon steel, composed simply of iron and carbon, accounts for 90% of steel production.High strength low alloy steel has small additions (usually less than 2% by weight) of other elements, typically 1.5% manganese, to provide additional strength for a modest price increase… Stainless steels and surgical stainless steels contain a minimum of 11% chromium, often combined with nickel, to resist corrosion (rust). Some stainless steels are magnetic, while others are nonmagnetic.

Some more modern steels include tool steels, which are alloyed with large amounts of tungsten and cobalt or other elements to maximize solution hardening. This also allows the use of precipitation hardening and improves the alloy’s temperature resistance. Tool steel is generally used in axes, drills, and other devices that need a sharp, long-lasting cutting edge. Other special-purpose alloys include weathering steels such as Cor-ten, which weather by acquiring a stable, rusted surface, and so can be used un-painted…