③ manganese content is higher person, in steel grade final line out“Mn ” , for example“T8Mn ” .
④ is advanced and high grade the phosphor of steel of carbolic element tool, sulfur content, lower than steel of tool of element of general and high grade carbon, add finally in steel grade note a letter“A ” , in order to show distinction, for example“T8MnA ” .
4. Easy cutting steel
Coronal of ① steel grade with“Y ” , in order to distinguish at steel of structure of element of high grade carbon.
② letter“The number after Y ” shows carbolic content, with average carbon content extremely express, for example average carbon content is the easy cutting steel of 0.3% , its steel grade is“Y 30”.
③ manganese content is higher person, the line out after Yi Zaigang date“Mn ” , for example“Y40Mn ” .
5. Alloy structure steel
The two digit word of begin of ① steel grade shows the carbolic content of steel, with average carbon content extremely express, be like 40Cr.
In ② steel main alloying element, outside removing individual microalloy element, general with hundred express. When ＜ of average alloy content 1.5% when, in steel grade general a symbol of line out element, and do not indicate content, but the person that Yi Zhihun mix leaves in special situation, in mark of the Yi Ke after elemental symbol with the number“1”, for example steel grade“12CrMoV ” and“12Cr1MoV ” , former chromic content is 0.4-0.6% , latter is 0.9-1.2% , the others class status is all and same. When alloying element average content≥1.5% , ≥2.5% , ≥when 3.5% …… , should indicate at the back of elemental symbol content, can express to be 2, 3, 4 …… to wait accordingly. For example 18Cr2Ni4WA.
The alloying element such as RE of Ti of the vanadium V in ③ steel, titanium, aluminous AL, boracic B, rare earth, all belong to microalloy element, although content is very low, still should win the bid in steel grade piece. For example in 20MnVB steel. Vanadium is 0.07-0.12% , boron is 0.001-0.005% .
④ advanced fine steel should be added finally in steel grade“A ” , in order to distinguish at general fine steel.
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