Hard Temp 660
(Code No :33 - 416)

:

A neutral salt used with Hard Temp A for hardening tool steel and selectively carburised steel. Also used for preparing initial melts of Hard Temp H. The salt can be used for preheating hot die steel and high speed steel prior to hardening.  Working Range :-660° to 900°C (upto 1000°C if covered with Hard Temp E 452). 

Hard Temp 720
(Code No :33 - 417)

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A water soluble neutral hardening salt used with Hard Temp A for hardening various tool steel and selectively carburised steels. Sometimes it is also used with 1 - 10% sodium cyanide as a scale free heat treatment medium. Working Range : -720° to 900° C (upto 950° C if covered with Hard Temp E). 

Hard Temp 830
(Code No :33 - 418)

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The salt is used with Hard Temp A for hardening chromium rust resisting steels B. S. En 36 A-D and B.S. En 57. Working Range :- 830° to 1100° C

Hard Temp 970
(Code No :33 - 419)

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Used for heating high-speed steel and hot work steels to the appropriate hardening temperature without scaling or decarburisation. Working Range :- 970°° C. to 1350

Hard Temp 495
(Code No :33 - 420)

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Used for quenching and secondary hardening of high-speed steels preferably where the temperature required is 500° to 540° C. Working Range :- 495° to 700° C 

Hard Temp 540
(Code No :33 - 421)

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Specially developed for quenching high speed steels and hot work tool steels after heating in Hard Temp 970. It is also used for secondary hardening of high-speed tool steels and for tempering. Working Range : -540° to 700° C