Development of High Strength Steel HSAPH 620 Grade for Automotive Structure

by Lutfi Amrullah, Bimakarsa Wijaya

Publisher - Krakatau Steel

Category - General Novel

The heavy truck industry has a high demand in market and its growth more and more significant. This condition is followed to the development of its technology which increase continually especially for under body component which requires high strength, good toughness, and also good formabilty. Chassis frame becomes the main structure of body component because it forms the backbone of a heavy truck. Therefore, HSAPH 620 grade is hot rolled steel product which is developed to fulfill those requirements. The production process of HSAPH 620 grade is started by making the slab continued with thermomechanical controlled rolling aiming to achieve fine ferrite grain size. Chemical and mechanical test result are allowed to HSAPH 620 standard. The hot rolled has yield strength, tensile strength, and elongation respectively ranging 560 – 570 MPa, 640 – 660 MPa, and 31 - 34% with toughness ranging 250 – 270 Joule in temperature -30ºC. The microstructure consists of ferrite, pearlite, and a little bainite phase with grain size ranging 2,60 – 3,90 µm added with good cleanliness of steel.

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