plate steel

Alloy number
Brand first figures indicate carbon content. Provides structural steel in one ten-thousandth of the number of units (two-digit), tool steel and special steel for the thousandth performance of the unit number (a number) to represent the carbon content, while the tool steel carbon content of more than one %, the carbon content is not marked.
Number of carbon content in the show, after the chemical symbol with the elements that the main alloying elements in steel, the content behind the figures indicated by the average content of less than 1.5% of the number of non-standard, with an average content of 1.5% ~ 2.49%, 2.5% ~ 3.49% ... ..., the corresponding landmarks to 2,3 ... ....
Alloy structural steel 40Cr, average carbon content of 0.40%, the main alloying elements Cr content of 1.5% or less.
Alloy tool steel 5CrMnMo, the average carbon content of 0.5%, the main alloying elements Cr, Mn, Mo contents were 1.5% or less.
Special steel with its use of Hanyu Pinyin initials to indicate.
Such as: ball bearing steel, the steel pre-marked with "G". GCr15 said that about 1.0% carbon content, chromium content of about 1.5% (which is a special case, the Cr content in units of one-thousandth of a digital representation) of steel ball bearings.
Y40Mn, said the carbon content of 0.4%, manganese content of less than 1.5% of free cutting steel and so on.
For advanced high-quality steel, then the increase in steel at the end of "A" word that, for example, 20Cr2Ni4

Overview
As science and technology and industrial development, on the material put forward higher requirements, such as high strength, high temperature, high pressure, low temperature, corrosion, wear and other special physical and chemical properties of the request, carbon steel can not fully meet the requirements.
Carbon steel in the performance of the main shortcomings are the following:
(1) The low hardenability under normal circumstances, carbon steel, the largest water-quenching quenching diameter of only 10mm-20mm.
(2) Yield strength and relatively low, such as ordinary carbon steel Q235 steel

Plate is a plate-shaped, rectangular, and can be directly rolled wide strip cut or formed.