GB/T 221-2000 in English

本标准规定了钢铁产品牌号表示方法。本标准适用于编写生铁、碳素结构钢、易切削钢、低合金高强度结构钢、合金结构钢、弹簧钢、工具钢、轴承钢、不锈钢、耐热钢、焊接用钢、电工用硅钢、电工用纯铁、高电阻电热合金及有关专用钢等产品牌号。本标准中未规定的钢铁产品牌号表示方法，应根据本标准规定的原则编写牌号。粉末冶金材料、铸铁(件)、铸钢(件)、铁合金、高温合金、耐蚀合金、精密合金等产品的牌号表示方法应分别符合下列国家标准规定。GB/T4309-1994粉末冶金材料分类和牌号表示方法GB/T5612-1985铸铁牌号表示方法GB/T5613-1995铸钢牌号表示方法GB/T7738-1987铁合金产品牌号表示方法GB/T14992-1994高温合金牌号GB/T15007-1994耐蚀合金牌号GB/T15018-1994精密合金牌号

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