CARRS TQ1 From Kind & Co

CARRS TQ1

TYPICAL ANALYSIS

C	0.36	Si	0.30
Mn	0.40	Cr	5.20
Mo	1.90	V	0.55

CHARACTERISTICS
TQ1 embodies an entirely new technology that has resulted in a hot work steel with properties far in advance of the best premium hot work steels such as those meeting the NADCA specification. The key properties of this new steel are its ability to combine toughness with hardness, low sensitivity to thermal shock and resistance to heat-checking.
Colour Code: ORANGE/RED

TYPICAL APPLICATIONS

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Diecasting tools for longer runs, arduous applications and difficult designs such as small sections.

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Extrusion tools.

HEAT TREATMENT

STRESS RELIEVING
Stress relieve at approximately 650^oC holding for 2-4 hours depending on section. Cool slowly in still air without the use of forced draught or grids.

HARDENING
Preheat in two stages to 650^oC and 850^oC allowing sufficient time for equalisation at each stage (minimum 30 minutes). Raise to the hardening temperature of 1,010/1,020^oC, allow to equalise then hold for 45 minutes.

QUENCHING
Quench in air, hot bath at 540^oC, oil, polymer or vacuum hardening furnace. When oil or polymer quenching, interrupt at 230-280^oC. Temper immediately while tools are still warm.

TEMPERING
Double tempering is essential and triple tempering beneficial.

STRESS TEMPERING
Raise the temperature to the last tempering temperature minus 30^oC and hold for 6 hours. Cool slowly in air without the use of forced draught or grids.

	IMPACT STRENGTH The pictures on the right contrast the results of an impact test on samples of TQ1 (left) and H13 (right). The H13 material is Electro Slag Refined steel and complies with the Diecasting Quality Standard NADCA 207-97.
	RESISTANCE TO THERMAL SHOCK The pictures on the left show the difference in resistance to thermal shock between TQ1 and H13 of a similar standard to that

CASE STUDY
The picture on the left shows part of the 80,000th component from a diecasting tool in H11 material produced to a standard in excess of NADCA 207-97 (the diecasting industry benchmark specification). Considerable break-up is evident and the tool would not be expected to continue long in production. The picture on the right is of the same part of the 80,000th component from a tool in TQ1. Note that there is no evidence of significant wear or break-up and there is clearly much life left in the tool.