Retained-austenite steel (TRIP-steel)
HCT690T - HCT780T

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Properties according to DIN EN 10 346

Steel type, cold rolled

Short designation	VDA239-100*	Surface finish	Material number
HCT690T	CR400Y690T-TR	+Z	1.0947
HCT780T	CR450Y780T-TR	+Z	1.0948

Your product of choice: Retained-austenite steel (TRIP-steel) | HCT690T - HCT780T

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1) Reduced minimum values of elongation at rupture apply to product thicknesses t < 0.60 mm (minus 2 units).
2) For ZF-coated, products the minimum values of elongation at fracture are reduced by 2 unites.
For ZF-coated in thicknesses t < 0.60 mm, the minimum elongation at rupture is reduced by 4 units.

* Comparative grade, therefore minor deviations from DIN EN values possible

Chemical composition, heat analysis

Percentage by weight % max.
Short designation	C	Si	Mn	P	S	Al_total(span)	Cr+Mo	Nb+Ti	V	B
HCT690T	0.24	2.00	2.20	0.080	0.015	0.015-2.0	0.60	0.20	0.20	0.005
HCT780T	0.25	2.20	2.50	0.080	0.015	0.015-2.0	0.60	0.20	0.20	0.005

Mechanical properties, longitudinal

Short designation	Proof stress R_p0,2 MPa	Tensile strength R_m MPa min.	Elongation at fracture A₈₀¹⁾²⁾ % min.	Strain hardening exponent n_10-UE min.	Bake hardening index BH₂ min.
HCT690T	400-520	690	23	0.19	40
HCT780T	450-570	780	21	0.16	40

Retained-austenite steel (TRIP-steel) HCT690T - HCT780T