Large diameter spiral pipe steel number identification method

Carbon tool steel

① steel number is crowned with “T”, so as not to be confused with other steels.

② steel number in the number of carbon content, the uniform carbon content of a few thousandths. For example, “T8” indicates that the uniform carbon content of 0.8%.

③ manganese content is higher in the steel number marked at the end of the “Mn”, such as “T8Mn”.

④ high-quality carbon tool steel phosphorus, sulfur content, lower than the general quality of carbon tool steel, in the steel number at the end of the letter “A”, to show the difference For example, “T8MnA”.

Carbon structural steel

① Q+number+quality grade symbol+deoxygenation method symbol. Its steel number is crowned with “Q”, on behalf of the yield point of steel, followed by the number of yield point values, the unit is MPa, such as Q235 that the yield point (σs) for the 235 MPa carbon structural steel.

② If necessary, the steel number can be marked behind the symbols indicating the quality level and deoxidation method. Quality grade symbols were A, B, C, D. Oxygen removal method symbols F said boiling steel, B said half-suppressed steel, Z said suppressed steel, TZ said special suppressed steel, suppressed steel can not be labeled symbols, that is, ZT and TZ can not be labeled. For example, Q235-AF means A grade boiling steel.

③ special-purpose carbon steel, such as: bridge steel, marine steel, etc., basically using carbon structural steel, but in the steel number at the end of the additional letters to indicate the use.

High-quality carbon structural steel

① two digits at the beginning of the steel number indicates the carbon content of the steel to the uniform carbon content of a few ten thousandths, such as uniform carbon content of 0.45% of the steel, steel number “45”, it is not the order of the number, so you can not read into the 45 steel.

② high manganese content of high-quality carbon structural steel, manganese should be marked out, such as 50Mn. ③ boiling steel, semi-sedated steel and special-purpose high-quality carbon structural steel should be marked out in the last special steel number, for example, the uniform carbon content of 0.1% of the semi-sedated steel, the number of its steel for 10b.