Skd1 Mold Steel Bar Optimization Of Key Process Parameters For Spheroidizing Annealing - China

Optimization of Key Process Parameters for Spheroidizing Annealing of SKD1 Mold Steel Bar Precise Control of Temperature Parameters

Heating Rate Control: After cold material is fed into the furnace, slowly heat to 600~650°C at a rate of ≤150°C/h for preheating.

After holding at preheated temperature for 1~2 hours, then heat to the annealing temperature at a rate of ≤100°C/h.

Purpose: To prevent thermal stress cracking of high-carbon, high-chromium steel due to poor thermal conductivity.

Temperature Uniformity Requirements: Temperature difference in the effective working area of ​​the furnace ≤±10°C.

For large steel bars (Φ>100mm), the holding time needs to be extended, calculated at 1.5~2 hours/25mm cross-section.

Reasonable Setting of Time Parameters

The determination of holding time needs to comprehensively consider the following factors: Table Influencing Factors Time Adjustment Strategy

Steel Bar Diameter For every 25mm increase, extend the holding time by 1~1.5 hours.

Charging Amount Extend by 10%~20% when the charging density is high.

Carbide Segregation Extend the isothermal time when there is severe segregation.

Furnace Type Differences Pit-type furnaces reduce heat preservation time by 10% compared to box-type furnaces.

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• Posted By: Dongguan Songshun Mould Steel Co., Ltd.

• Phone: 076985475596

• Address: 1st Floor, No. 1, Dongda Fourth Street, Shatou Community, Chang'an Town, Dongguan , Guangdong , China

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• Website: https://songshunsteel.com/

• Business Description: Established in 2009,Songshun Steel supplies a wide range of carbon, alloy and tool steel products, including high speed tool steel, cold work tool steel, hot work tool steel, plastic mould steel, engineering steel and machine structural steel etc.
  
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