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HIGH SPEED STEEL RESPONSE TO HEAT TREATMENT

POWMEX Grade	Hot forming temp. ºC	Annealing temp. ºC	Stress releiving temp. ºC	Hardening temp. ºC	Quenchant- ºC	Normal tempering temp. range ºC	Obtainable hardness after tempering-HRC/Rockwell C	Hardness after annealing Brinell, max.	Modulus of elasticity 10³N/mm²	Density g/cm³	Thermal conductivity W/(m.K)	Electric resistivity Ohm mm²/m	Specific heat capacity J/(g.K)	Thermal expansion between 20ºc and ...ºc 10exp-6m/(m.k.)
														100	200	300	400	500	600	700
IT1	1150-900	770-840	600-650	1250-1290	Oil, DL, WB (500-550)	550-580	64-66	280	217	8,7	19	0,50	0,46	10,0	10,5	10,8	11,2	11,3	11,4	11,6
IT4	1150-900	770-840	600-650	1240-1280	Oil, DL, WB (500-550)	550-580	64-66	300	217	8,7	19	0,65	0,46	10,0	10,5	10,8	11,2	11,3	11,4	11,6
IT15	1150-900	770-840	600-650	1210-1250	Oil, DL, WB (500-550)	550-580	65-67	300	217	8,3	19	0,75	0,46	10,0	10,5	10,8	11,2	11,3	11,4	11,6
IT42	1100-900	770-840	600-650	1170-1210	Oil, DL, WB (500-550)	540-570	64-66	280	217	8,3	19	0,65	0,46	11,0	11,5	11,9	12,3	12,4	12,5	12,5
IM2	1100-900	770-840	600-650	1170-1210	Oil, DL, WB (500-550)	540-570	64-66	280	217	8,0	19	0,60	0,46	11,0	11,5	11,9	12,3	12,4	12,5	12,5
IM3	1100-900	770-840	600-650	1140-1180	Oil, DL, WB (500-550)	540-570	63-65	280	217	7,9	19	0,50	0,46	11,5	11,7	12,2	12,4	12,7	13,0	12,9
IM6	1100-900	770-840	600-650	1170-1210	Oil, DL, WB (500-550)	530-560	67-69	280	217	8,3	19	0,65	0,46	11,0	11,5	11,9	12,3	12,4	12,5	12,5
IM35	1100-900	770-840	600-650	1190-1230	Oil, DL, WB (500-550)	540-570	64-66	280	217	8,1	19	0,54	0,46	11,5	11,7	12,2	12,4	12,7	13,0	12,9
IM42	1100-900	770-840	600-650	1190-1230	Oil, DL, WB (500-550)	540-570	64-66	280	217	8,1	19	0,54	0,46	11,5	11,7	12,2	12,4	12,7	13,0	12,9

DL=Air Blast; WB=Salt Bath
1) Upper range for simple tools shapes, lower range for intricate tool shapes.
2) The toughness needed for cold work tools may require lower hardening temperatures.


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