• Model NO.：KM-26
• Special Use：Free Cutting Steel
• Application：Tool Steel Bar
• Size：5X5 mm - 60X60 mm
• Length：1m - 6m ,or as Request.
• Quality Certificate：ISO, SGS, BV
• Inspection：The Third Party or Welcome Your Visiting to Inspec
• MOQ：500 Kgs
• Delivery Time：20-25 Days for 20′′ Gp
• Loading Port：Chinese Main Port
• Payment Term：T,T L,C
• Transport Package：Standard Sea-Worthy Package
• Specification：5x5 mm - 60x60 mm
• Trademark：Kingmetal
• Origin：China
• Production Capacity：2000 Ton,Tons , Month

SUP9 Alloy Spring Steel Equivalent to 

Heat treatment Related for 1.7176 Spring Steel 

• Annealing of SUP9 Spring Steel
  Slowly heated to 740-770 ºC and allow enough times, let the steel to be thoroughly heated, Then cool slowly in the furnace. The SUP9 tool  steel will get MAX 250 HB (Brinell hardness).
   
• Hardening of SUP9 Spring Steel
  SUP9 steels should be heated uniformly to 830-860°C (1526-1580°F) until completely heated through. About 30 min per 25 mm of ruling section is to be provided and then the steels should be immediately quenched in oil.
   
• Tempering of SUP9 Spring Steel
  Tempering of SUP9 steels is performed at 460-510°C, Soak well at the selected temperature and soak for at least one hour per 25mm of total thickness.

Mechanical Properties of SUP9 Spring Steel 

The mechanical properties of SUP9 Spring Steels are outlined in the following table.

Applications of SUP9 

SUP9 steels, Highlight the advantage is good hardenability, another hot working performance, comprehensive mechanical properties, Decarburization resistance is also good big cross section of various important spring, such as automobile, locomotive, large plate spring, spring, etc. SUP9 Spring main used for heavy vehicles, tractors, industrial production load, stress and the diameter of the larger plate spring and helical spring