9Mn2V mechanical properties of steel is a carbon tool steel better than the low alloy tool steel, it has a high hardness and wear resistance. Quenching deformation small, good hardenability. As the steel contains a certain amount of vanadium, refined grains, reduce the heat sensitivity of the steel. While smaller and evenly distributed carbides. 9Mn2V steel for manufacture of various precision measuring tools, a model, but also for the general requirements of smaller die size and die cold, carving mode, blanking die, etc., can do the machine screw and other structural parts. 

 9Mn2V steel chemical composition shown in Table 2-10-1. 



 Table 2-10-1 9Mn2V steel chemical composition (GB / T 1299-2000) ω /% 

 C 
 Si 
 Mn 
 V 
 P 
 S 

 0.85 ~ 0.95 
 ≤ 0.40 
 1.70 ~ 2.00 
 0.10 ~ 0.25 
 ≤ 0.030 
 ≤ 0.030 


 9Mn2V critical temperature of steel are shown in Table 2-10-2. 

 Table 2-10-2 9Mn2V critical temperature of steel 

 Critical point 
 Ac1 
 Acm 
 Ar1 
 Ar3 
 Ms 

 Temperature (approximate) / ℃ 
 730 
 760 
 655 
 690 
 125 


 Alloy tool steel: 9Mn2V 
 Standard: GB / T 1299-1985 
 ● Features and Scope: 
 Cold work tool steel, carbon tool steel is a better than the overall mechanical properties of low-alloy tool. Has a high hardness and wear resistance, hardenability is also good, quenching deformation. Suitable for the production of small cold mold, especially for production of the various requirements of small deformation, wear high-precision measuring tools (such as templates, block gauge, gauge, etc.) and precision screw machine, grinding machine spindles. 
 ● Chemical Composition: 
 Carbon C: 0.85 ~ 0.95 
 Si Si: ≤ 0.40 
 Manganese Mn: 1.70 ~ 2.00 
 S S: ≤ 0.030 
 Phosphorus P: ≤ 0.030 
 Ni: to allow the residual content of ≤ 0.25 
 Copper Cu: ≤ 0.30 to allow the residual content 
 Vanadium V: 0.10 ~ 0.25 
 ● Mechanical Properties: 
 Hardness: Annealed, ≤ 229HB, indentation diameter ≥ 4.0mm; quenching, ≥ 62HRC 
 ● Heat treatment and microstructure specifications: 
 Standard heat treatment: quenching, 780 ~ 810 ℃ oil cooling. 
 ● Delivery status: Delivery of steel in the annealed condition.