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2, the classification that our country steel grade represents a means explains
1. Steel of carbolic element structure
① by Q number quality grade symbol composition of deoxidization method symbol. Its steel grade coronal with“Q ” , represent the yield point of rolled steel, the number from the back states yield point is numeric, the unit is MPa for example Q235 represents yield point (σS) the steel of carbolic element structure that is 235 MPa.
② when necessary at the back of steel grade but the sign that line out shows quality grade and deoxidization method. Quality grade symbol is A, B, C, D respectively. Deoxidization method symbol: F expresses boiling steel; B expresses half composed steel: Z expresses composed steel; TZ expresses special and composed steel, composed steel but not mark symbol, namely
Z and TZ but not mark. For example Q235-AF expresses steel of class A boiling.
The carbon steel of ③ special utility, for example bridge steel, marine steel, the expression that basically uses steel of carbolic element structure method, but add finally in steel grade the letter that represents use.
2. Steel of structure of element of high grade carbon
The two digit word of begin of ① steel grade shows the carbolic content of steel, with average carbon content extremely express, for example average carbon content is the steel of 0.45% , steel grade is“45”, it is not ordinal date, cannot read 45 steel so.
The steel of structure of element of high grade carbon with ② manganese higher content, should manganese element line out, for example 50Mn.
The steel of structure of element of high grade carbon of ③ boiling steel, half composed steel and special utility should be in steel grade is special finally line out, for example average carbon content is the half composed steel of 0.1% , its steel grade is 10b.
3. Steel of carbolic element tool
Coronal of ① steel grade with“T ” , lest with other steel kind interblend.
The number in ② steel grade shows carbolic content, with average carbon content thousand express. For example“T 8”State average carbon content is 0.8% .
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