Need Help to define 42CrMo4 HH TQ+T 2

[zner46]

Please provide a definition for the specification 42CrMo4 HH TQ+T. What does HH and TQ+T specifically means.

 

[CoryPad]

Q + T means Quench and Temper. This steel is strengthened by austenitizing (heating to ~ 1000 [°]C), then quenching (~ 25 [°]C), then tempering (~ 500 [°]C).

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[TVP]

zner46,

You need to obtain the standard EN 10083-1 Quenched and tempered steels - Technical delivery conditions for special steels. This standard defines the requirements for grade 42CrMo4 +HH +QT. The +HH designation means that the grade has restricted hardenability (see Table 7), and as CoryPad already mentioned, the +QT means quenched and tempered. Table 12 of this standard provides some guidance values for heat treating parameters, which for this grade are 820-860 C for the austenitizing temperature, and 540-680 C for the tempering temperature. Oil or water can be used for quenching depending on the exact hardness, depth of hardening, etc. DIN EN 10083-1 or BS EN 10083-1 are available from Global Engineering Documents using the following link:

http://global.ihs.com

 

[Pressed]

These should clear up that pesky HH:

[URL unfurl="true"]http://www.edelstahl-witten-krefeld.de/upload/binarydata_ewkinterd4cms/1556/7225_uk.pdf[/URL]

[URL unfurl="true"]http://www.edelstahl-witten-krefeld.de/upload/binarydata_ewkinterd4cms/1539/br_verguetungsst_thyrofort_en.pdf[/URL]

[URL unfurl="true"]http://www.novacciai.it/pdf/quenching_and_tempering.pdf[/URL]

[URL unfurl="true"]http://www.ovako.com/Data/r3116/v1/Data_sheet_Imatra_42CrMo4.pdf[/URL]

[URL unfurl="true"]http://alruqee.net/rtc_final/My%20Documents/RTC%20Web&CD/METAL_ALLOYS/low%20alloyed%20steel/4140.pdf[/URL]

==========================================
Business Card

http://mech.e.tripod.com

__________________________________________
Cycle Heaven.......

http://www.tailofthedragon.com