Commonly Used Metal Material Brands

First, the steel product brand representation method (refer to GB/T221-2000)

1. Basic profile of the standard

The GB/T221-2000 standard was issued on April 1, 2000 after being revised with reference to the foreign steel product grade indication method and the domestic steel product grade indication change (such as Q345 instead of 16Mn), and on November 1, 2000. Started.

2. Changes in major technical content

(1) Since some steel product grades have their own special standards, the grades of iron alloys, cast alloys, high-temperature alloys, precision alloys, corrosion-resistant alloys, cast irons, cast steels, powder materials, etc. have been eliminated from the original standard.

(2) The emergence of some new steel products has further improved the original standards. The new standard adds grades such as decarburized low-phosphorus iron pellets, vanadium-containing pig iron JP2, wear-resistant cast iron, guaranteed hardenability steel, non-quenched and tempered mechanical structural steel, plastic die steel, and oriented silicon steel (for telecommunications).

(3) Some steel grades that do not adapt to the development of science and technology and are inconsistent with production have been completely changed or modified. Such as carbon structural steel A 3 changed to Q235, low alloy high strength structural steel 16Mn to Q345 and so on. Modifications have also been made to the designation of stainless steel, heat-resistant steel, and cold-rolled silicon steel.

(4) Table 3 of the “Example of Iron and Steel Product Number Representation” in the original standard was deleted because it does not apply to the new standard.

3. Basic principles for the representation of steel product grades

(1) The grades of steel products in national standards and industry standards should be written according to the grades specified in GB/T221-2000. Steel grades that are not complied with the provisions should be changed when the standard is revised. Some new steel products should also be branded according to their grades.

(2) The indication of the product's brand number is generally expressed in a combination of Chinese Pinyin letters, chemical element symbols and Arabic numerals.

(3) When the pinyin letters are used to indicate the product name, purpose, characteristics, and process method, the first letter is generally selected from the Pinyin that represents the product name. When the letters selected for another product are duplicated, the second letter or the third letter may be used instead.