Steel Number Comparison Between Domestic and Overseas
Steel is one of the most important commodities in the world, as it is used in a wide range of applications such as in the construction and machine industries. Steel manufacturers around the world assign unique numbers to their respective steels, which makes it difficult to compare and contrast the different domestic and foreign steel grades. The comparison table provided in this article provides an overview of the various steel grades in use around the world, as well as their respective numbers.
China
The Chinese government utilizes a system of steel numbering that is divided into two parts, one for carbon steel and the other for alloy steel. Carbon steel numbers start with a G, while the alloy steel numbers are prefixed by a T. Within each category, the first two digits denote the grade and the third digit denotes the class, followed by additional numbers to delineate the type of steel and its chemical composition. For example, GB/T 12Cr1MoV is a Chinese-made high-quality alloy steel with a hardness of HB270-321 and a chlorine element of 1.75-2.00%.
United States
The American Institute of Steel Construction (AISC) utilizes a similar system to the Chinese, with the letter A prefixed to steel numbers to denote alloy steel grades. Carbon steel grades have a number from 1 through 23, which are separated into various categories based on their properties and applications. As an example, the AISC-designated steel grade A-572 has a carbon content range of 0.2-0.5%, which is suitable for a variety of general applications including structural support beams, plates and tubing.
Europe
The European steel industry relies on the European Numbering System (EN), which has three prefixes for different types of steel. The prefixes are S for structural steels, P for pressure vessel steels and T for tool steels. The first two digits represent the main alloying element and the final two digits denote the steel grade. As an example, the EN-designated steel grade S355 is a structural steel composed of a combination of Manganese, copper, silicon, and vanadium in a range of 0.05-0.25%. It has a hardness of HB335-550 and is often used in the construction of bridges and other large structures.
Australia
The Australian steel industry utilizes a unique numbering system that is not used in other countries. The first two digits of an Australian steel number denote the steel grade and the last two digits denote the alloying element. The grades range from 1 to 26, with 1 denoting the highest grade and 26 the lowest. As an example, the Australian steel grade designated by 19H is a high-tensile steel with a minimum tensile strength of 550MPa and a high resistance to corrosion.
By referencing this comparison table, it is easier for buyers and sellers to accurately compare and contrast different domestic and overseas steel numbers to match their needs. This comparison table serves as a guide to help ensure accurate selection of the correct steel and to improve the efficiency of steel transactions worldwide.
