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ANSWER: EN10338 is the European standard applies to hot rolled and cold rolled non-coated steel flat products made of multiphase steels for cold forming. It covers cold rolled steel products of thickness t less than 3mm and hot rolled products of thickness t not more than 6mm.
EN10338 HCT690T is cold rolled non coated steel flat material made of multiphase steel for cold forming.
HCT690T is transformation induced plasticity quality steel, means steel with a ferritic matrix containing retained austenite capable of transformation into martensite during the forming process (TRIP effect). The delivery condition of HCT690T is normally supplied in the skin-passed condition.
The material of No. Of HCT690T is 1.0947.
Proof strength of HCT690T is 400-520MPa, Tensile strength is min 690MPa, Elongation A80 is min 23%. Strain hardening exponent n: min 0.19. Bake hardening index BH2 is min 40MPa.
