Yuyao Hemudu Site stainless steel strip cold rolling mill   

          identification method for stainless steel;
        steel number and representation methods of  
        with the international chemical elements and their symbols to represent the chemical composition, in Arabia letter to indicate the contents of components:   />          using a fixed number of bits to represent the steel series digital or digital; such as: the United States, Japan, 300 series, 400 series, 200 series;  
        using the Latin alphabet and their sequence number, only that the use of.  
    我国的编号规则 
    ①采用元素符号 
    ②用途、汉语拼音，平炉钢：P、 沸腾钢：F、 镇静钢：B、甲类钢：A、T8：特8、 
    GCr15：滚珠 
    ◆合结钢、弹簧钢，如：20CrMnTi 60SiMn、（用万分之几表示C含量） 
    ◆不锈钢、合金工具钢（用千分之几表示C含量），如：1Cr18Ni9 千分之一（即 
    0.1%C）,不锈 C≤0.08% 如0Cr18Ni9,超低碳C≤0.03% 如0Cr17Ni13Mo 
    国际不锈钢标示方法 
    美国钢铁学会是用三位数字来标示各种标准级的可锻不锈钢的。 Where:  
        the austenitic stainless steel with 200 and 300 series of digital label,  
        the ferritic and martensitic stainless steel with 400 series digital representation. For example, some of the more common austenitic stainless steel  
        is to 201,   304,   316 and 310 markers,  
        the ferritic stainless steel is 430 and 446 for the mark, martensitic stainless steel   is in 410, 420 and 440C for the standard  
        remember, dual phase (austenite and ferrite),  
        the stainless steel and precipitation hardening stainless steel and iron content of less than 50% of the high alloy is usually adopted the name of the patent or trademark naming.  
    4)．标准的分类和分级 
    4-1分级： 
    ①国家标准GB 
    ②行业标准YB 
    ③地方标准 
    ④企业标准Q/CB 
    4-2 分类： 
    ①产品标准 
    ②包装标准 
    ③方法标准 
    ④基础标准 
    4-3 标准水平（分三级）： 
    Y级：国际先进水平 
    I级：国际一般水平 
    H级：国内先进水平 
    4-4国标 
    GB1220-84 不锈棒材（I级） 
    GB4241-84 不锈焊接 Pan Yuan (grade H)  
        GB4356-84  welding of stainless plate garden (I)  
        GB1270-80  stainless steel tube (I)  
        GB12771-91  stainless welded pipe (Y)  
        GB3280-84  stainless cold plate (I)  
        GB4237-84  stainless steel hot plate (I)  
        GB4239-91  stainless steel cold strip (class I)