1, carbon tool steel

 

The steel dubbed “T”, so as not to be mixed with other steel types.

 

The steel carbon content in the digital representation, to a few thousandths of the average carbon content of the said. For example, “T8” means that the average carbon content is 0.8%.

 

The manganese content is high, in ganghao finally marked “Mn”, such as “T8Mn”.

 

The high quality carbon steel of phosphorus and sulfur content than the general high quality carbon steel low, in ganghao finally filling the letter “A”, to show the difference, such as “T8MnA”.

 

2. Easy cutting steel

 

The steel dubbed “Y”, which is different from the high quality carbon steel.

 

The letter “Y” after the digital representation of the carbon content, the average carbon content of the very few, such as the average carbon content of 0.3% free cutting steel, the steel grade is Y30″.

 

The manganese content is high, also in the steel after the mark “Mn”, such as “Y40Mn”.