11. Welding steel before its steel preceded by the letter "H", to distinguish it from other types of steel. Such as stainless steel wire for the "H2Cr13" Liaocheng stainless steel fine screw can be used to distinguish between stainless steel "2Cr13". 12. Electrical letters and numbers ① with silicon steel. DR represents the letter head of steel hot-rolled silicon steel electrician, DW represents electrician cold-rolled non-oriented silicon steel, DQ represents electrician cold-rolled silicon steel. Digital ② letter, said after the iron loss value (W / kg) 100 times. Stainless steel screws Jining fine tooth screws, stainless steel nuts, stainless steel rivets, stainless steel bolts, 316L screw ③ steel tail letters "G" by Yantai stainless steel fine screw, expressed at a high frequency test; do not add "G" who, He expressed at a frequency of 50 cycles under test. Such as steel DW470 represents electrical products cold rolled non-oriented silicon steel at 50 Hz frequency of maximum unit weight of iron loss is 4.7W / kg. 1. The length range of steel is an effective measure to save material. Length is the length range or length by width is not less than a certain size, or length, long by wide delivery from number to number of sizes. Production units can be produced according to the requirements of this size available. 2. not length (usually length) where the dimensions (length or width), within the standard range, but without requiring a fixed size called not length. Length Length is usually not known length (through feet). By not length delivery metallic material, as long as the prescribed length delivery can be. Such as stainless steel fine-tooth screws, no more than an ordinary round of 25mm, which is usually defined as the length of 4-10m, the length of the bar in this range can be delivered. Binzhou stainless steel fine-tooth fine screw stainless steel screws _ _ Jinan Road ground is provided by Jinan Daoqin Trading Company. Jinan Daoqin Trading Company (www.daoqinshangmao.com) (www.daoqinshangmao.com) strong, credible, in Jinan, Shandong hardware accessories industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Jinan Road ground into the brilliant and you work for a better future!