The all-new Optima features high tensile car body parts produced using a hot stamping method that provides greater safety in the event of collisions, while at the same time reducing the vehicle’s environmental footprint via decreased emissions and enhanced fuel efficiency.
Hot stamping is a method used for making 150kgf ultra high tensile steel sheets. It entails heating high tensile steel to high temperatures (over 900℃) to facilitate stamping, and then putting it through press stamping and rapid cooling at the same time.
Ultra high strength car body parts made by this hot stamping method include the center filler which supports the car body during side collisions and the roof side rail that connects the sides of the roof. The use of 150kgf ultra high tensile strength steel sheets ensures roof crush resistance and added safety during side collisions. The side sill uses 120kgf ultra high tensile strength steel for a larger cross section while 45kgf steel sheets were added to the inside of the center filler for increased resistance against side impacts.
To improve the strength of the car body and reduce its weight, high tensile steel sheets were used in various areas. High tensile steel sheets of over 35kgf make up more than 60% of the total car body. Ultra high tensile steel sheets of over 60kgf account for 20% of the car body.
The application of the hot stamping method on ultra high strength steel sheets for side safety was recognized by Korea NCAP which gave the highest marks (5 stars) for side impacts.
Editor’s note: Thank you Mr. Ahn for the nice post. Just two days ago, Nov. 25th, we received good news that the Venga and Sportage were awarded 5-star safety by EuroNCAP. We hope to hear that Optima gets the highest rank soon! If you want to know more about Venga and Sportage’s EuroNCAP 5-star rating, please visit our corporate news page on our global homepage.