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- Meproche MN 660: Working range 660° C to 890° C used as preheating salt for high speed tool steels, selective carbon steels and hot working steel prior to hardening with Meproche 970
- Meproche MN 660 SPL : Working range 660° C to 930° C
- Does not allow the formation of oxide film on the jobs
- It is compatible with cynide and allows easier absorption of carbon
- Meproche MH 830 : Working range 830° C to 1100° C
- Used for hardening of corrosion resisting steels, 2% carbon, 12% chromium tool steels and steels used for cutlery
- Sometimes used as alternative to Meproche 970 or 1100 for hot working steels
- Use of regenerator is recommended
- Meproche MH 970 : Working range 970° C to 1350° C
- Used for heating the high speed and hot working steels to obtain the desired hardening temperature in the above working range
- This salt avoids scaling as well as decarburisation of the steels
- However certain types of above steels tend to decarburise during hardening in MH 970, resulting in a low surface hardness
- Whenever this problem encountered, MH 971 should be used to prevent any decarburisation
- Meproche MH 971 : Working range 970° C to 1350° C
- Used for hardening high speed steel and hot working steels with minimum amount of decarburisation
- Meproche MH 1100 : Working range 950° C to 1350° C
- The most superior quality salt with high purity and practically no moisture content
- Used with regenerator to clean the high salt bath
- The regenerator contains deoxidation agent which reacts and converts the oxide impurities into slag thereby preventing decarburisation
- Meproche 11000 is used for the heat treatment of - high speed steels
- Hot working steels used for dies, punches, mandrels, moulds etc. and high carbon high chromium type steels
- It does not allow decarburisation
