9. Alloy tool steel and high speed tool steel alloy tool steel ① steel average carbon content is ≥1.0% Yantai stainless steel screws Japanese standard, the carbon content is not marked; when the average carbon content of <1.0%, to a few thousandths. For example Cr12, CrWMn, 9SiCr, 3Cr2W8V. ② representation content of alloying elements in steel Liaocheng stainless steel screws Japanese standard is basically the same as alloy structural steel. But for low chromium steel alloy tool steel, the chromium content of a few thousandths and express digital content before the "0" stainless steel screws Japanese standard for it and the general element content by percent The method represents a distinguished few. For example Cr06. ③ high-speed steel, tool steel carbon content is generally not marked, marked only a few percent of the average content of various alloying elements. Such as steel, tungsten high speed steel is expressed as "W18Cr4V". Steel numbers preceded by the letter "C" who indicated that their carbon content higher than the highest "C" common steel. Stainless steel screws, stainless steel screws 316 bolts, stainless steel rivets Jining Japanese standard screws, stainless steel rivet nut. 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", it 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, stainless steel nuts, stainless steel rivets, stainless steel bolts, screws ③ tail 316L steel letters "G" who expressed at high frequency testing; not added "G" are 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. Weihai stainless steel screws JIS Japanese standard 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!