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Concept of steel

2019-10-16 18:19:49
1. Concept of steel: Steel is an alloy of iron, carbon and a small amount of other elements. Steel is the material of various shapes, sizes and properties that we want to produce ingots, billets or steels by pressure processing. Steel is an indispensable material for the nation's construction and realization of four modernization. It is widely used and widely used. According to the shape of the section, it is generally divided into four categories: profiles, plates, pipes and metal products. In order to facilitate the production and ordering of steel products. Supply and do a good job in business management, and is divided into heavy rail, light rail, large steel, medium steel, small steel, cold-formed steel, high-quality steel, wire, medium-thick steel, thin steel, silicon steel for electrical, strip, no Sew steel pipe, welded steel pipe, metal products and other varieties.

Steel is an alloy of iron, carbon and a small amount of other elements. Stainless steel or corrosion resistant alloy steel with a chromium content of 10.5% or more is a general term for such metals. It should be remembered that stainless steel does not mean that the steel does not rust or corrode, but that it is much more resistant to corrosion than alloys that do not contain chromium. In addition to chrome metal, other metal elements such as nickel, molybdenum, vanadium, etc. can also be added to the alloy to change the properties of the alloy steel to produce stainless steel of different grades and properties. Careful selection of the most suitable stainless steel tool for the application will be critical to improving the efficiency and success of a particular job, depending on the application and location. The advantages of different metal elements in the tool. Simply put: steel is an alloy of iron and carbon. The other ingredients are designed to differentiate the properties of the steel. The following are an important list of steels in alphabetical order, which contain the following ingredients:

Carbon - is present in all steels and is the most important hardening element. To help increase the strength of steel, we usually want tool grade steel to have more than 0.5% carbon and also become high carbon steel.

Chromium - Increases wear resistance, hardness, and most importantly corrosion resistance, with more than 13% considered stainless steel. Despite this, all steel will rust if not properly maintained.

Manganese - An important element that contributes to the formation of texture structures, increased robustness, and strength, and wear resistance. Deoxidation of the steel inside during heat treatment and coiling occurs in most steels for cutting, except for A-2, L-6 and CPM 420V.

Molybdenum - a carbonizing agent that prevents steel from becoming brittle and maintains the strength of steel at high temperatures. It occurs in many steels. Air hardened steels (eg A-2, ATS-34) always contain 1% or more. Molybdenum, so that they can harden in the air.

Nickel - Maintains strength, corrosion resistance, and toughness. Appears in L-6\AUS-6 and AUS-8.

Silicon - helps to increase strength. Like manganese, silicon is used to maintain the strength of steel during the production of steel.

Tungsten - Enhanced wear resistance. Tungsten is mixed with an appropriate proportion of chromium or manganese for the manufacture of high speed steel. In the high speed steel M-2, a large amount of tungsten is contained.

Vanadium - enhances wear resistance and ductility. A vanadium carbide is used to make striped steel. Vanadium is found in many types of steels, of which M-2, Vascowear, CPM T440V and 420VA contain large amounts of vanadium. The biggest difference between BG-42 and ATS-34 is that the former contains vanadium.

2, the type of steel

The molten steel produced by the steelmaking furnace is cast into a billet, and the ingot or billet is subjected to pressure processing into steel (steel product). There are many types of steel, which can be divided into four categories: type, plate, tube and wire.

1, steel type

    There are many varieties of steel, which is a solid strip of steel with a certain cross-sectional shape and size. According to the shape of the section, it is divided into two types: simple and complex. The former includes round steel, square steel, flat steel, hexagonal steel and angle steel; the latter includes steel rail, I-beam, channel steel, window frame steel and profiled steel. Small round steel wire with a diameter of 6.5 - 9.0mm is called wire.

2, steel plate

    It is a flat steel with a wide aspect ratio and a large surface area. According to the thickness, the thin plate (thickness < 4mm), the middle plate (thickness 4 -25mm) and the thick plate (thickness > 25mm) are divided into three types. The steel strip is included in the steel sheet.

3, steel pipe

    The steel pipe is a long strip of steel with a hollow section. According to its cross-sectional shape, it can be divided into round pipe, square pipe, hexagonal pipe and various special-shaped steel pipes. According to different processing techniques, it can be divided into two categories: seamless steel pipe and welded pipe steel pipe.

4, steel wire

    Steel wire is another cold-worked product of wire. According to the shape, the steel wire, the flat wire and the triangular wire are divided. In addition to direct use, steel wire is also used in the production of steel wire ropes, steel wire and other products.
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