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| Published：2011.08.09 News Sources： Views： | |||
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1. Carbon Steel ① by the quality and grade of Q + digital + sign + deoxy method symbols. Its steel dubbed "Q", on behalf of the steel yield point, yield point behind the numbers indicate the value, expressed in units of MPa yield point such as Q235 (σs) of 235 MPa of carbon structural steel. ② If necessary, said steel behind the quality and grade can be marked with the symbol and the deoxidation method. Quality rating symbols are A, B, C, D. Deoxy method symbol: F, said boiling steel; b represent semi-killed steel: Z that killed steel; TZ said special killed steel, killed steel may mark symbol, that is, Z and TZ can not mark. For example, Q235-AF that A-level boiling steel. ③ special purpose carbon steel, such as steel bridges, marine steel, carbon structural steel using basically the representation, but added that the use of steel last letter. 2. Quality carbon structural steel ① steel beginning of the two numbers indicate the carbon content of steel, the average carbon content of the very few that, for example, the average carbon content of 0.45 percent of steel, steel number "45", it is not a sequence number, it can not be read as 45 steel. ② high quality carbon manganese structural steel, manganese should be marked, such as 50Mn. ③ rimmed steel, semi-killed steel and special-purpose high-quality carbon structural steel should be particularly marked in the final steel, for example, the average carbon content of 0.1% semi-killed steel, the steel No. 10b. 3. Carbon tool steel ① steel known as "T", so as not to be mixed with other types of steel. ② steel carbon content in the digital representation, the average carbon content of a few thousandths of that. For example, "T8" that the average carbon content of 0.8%. ③ higher manganese content in the steel end marked "Mn", for example, "T8Mn". ④ High quality carbon tool steel, phosphorus, sulfur content, than low-quality carbon tool steel, steel last filling in the letters "A", to show the difference, for example, "T8MnA". 4. Cutting steel ① steel known as "Y", as distinct from high-quality carbon structural steel. ② letter "Y" after the numbers indicate the carbon content, the average carbon content of the very few that, for example, the average carbon content of 0.3% of free cutting steel, the steel as "Y30". ③ higher manganese content, but also in the steel after the marked "Mn", for example, "Y40Mn". 5. Alloy Steel ① steel beginning of the two numbers indicate the carbon content of steel, the average carbon content of the very few that, as 40Cr. ② the main alloying elements in steel, in addition to individual micro-alloying elements, in general, to a few percent, said. When the average alloy content of <1.5%, the steel elements are generally marked only symbols, not marked content, but prone to cause confusion in those special circumstances, after the element symbol can also be marked with the number "1", such as steel "12CrMoV" and "12Cr1MoV", the former chromium content of 0.4-0.6%, 0.9-1.2% for the latter, all the remaining ingredients the same. When the average content of alloying elements ≥ 1.5%, ≥ 2.5%, ≥ 3.5% ... ..., the symbol of the element content should be marked on the back, can be expressed as the corresponding 2,3,4 ... etc. For example 18Cr2Ni4WA. ③ steel vanadium V, Ti Ti, Al AL, boron B, RE alloys of rare earth elements are micro-alloying elements, although very low levels, should bid out in steel. For example 20MnVB steel. To 0.07-0.12% vanadium, boron 0.001-0.005%. ④ High quality steel in the steel should be added the last "A", as distinct from the general high quality steel. ⑤ special purpose alloy steel, steel, known (or suffix) on behalf of the steel uses symbols. For example Lo dedicated 30CrMnSi riveting steel, steel, said to ML30CrMnSi |
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