GB/T 221-2000 Notations for designations of iron and steel

Standard No.: GB/T 221-2000
Language: Chinese
Release Date: 2000
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Replace By: GB/T 221-2008
Lastest: GB/T 221-2008

Scope: This standard specifies the indication method of grades of iron and steel products. This standard is applicable to the preparation of pig iron, carbon structural steel, free-cutting steel, low-alloy high-strength structural steel, alloy structural steel, spring steel, tool steel, bearing steel, stainless steel, heat-resistant steel, welding steel, electrical silicon steel, Brands of pure iron for electricians, high-resistance electric heating alloys and related special steels. For steel product designation methods not specified in this standard, the designation shall be prepared according to the principles stipulated in this standard. The designation methods of powder metallurgy materials, cast iron (pieces), cast steel (pieces), ferroalloys, superalloys, corrosion-resistant alloys, precision alloys, etc. shall comply with the following national standards. GB/T 4309-1994 Classification of powder metallurgy materials and representation of grades GB/T 5612-1985 Representation of grades of cast iron GB/T 5613-1995 Representation of grades of cast steel GB/T 7738-1987 Representation of grades of ferroalloy products GB/T l4992 —1 994 High temperature alloy grade GB/T l5007—1994 Corrosion-resistant alloy grade GB/T l5018—1994 Precision alloy grade

GB/T 221-2000Notations for designations of iron and steel