ArcelorMittal Tailored Blanks has developed hot stamped laser welded blanks which combine the benefits of laser welding technology with the high performance of hot stamped steel. These new applications can often be stamped as one part instead of the multiple parts which are usually required.
By using Usibor® and Ductibor®, the weight of the parts can be significantly reduced and optimal performance in crash behavior achieved. Hot stamped laser welded blanks have now been adopted by most major car manufacturers and multiple applications have gone in serial production.
Usibor ® and Ductibor ® automotive field application Tailor Welded blanks hot stamped
With the introduction of ArcelorMittal’s second generation PHS steels, OEMs will gain access to the materials they need to reduce vehicle weight even further. In turn, this will give them the design freedom they need to create lightweight mobility solutions. ArcelorMittal’s recent S-in motion® projects for mid-size sedans and SUVs have shown that weight savings of up to 26% are achievable for the body-in-white (BIW) compared to existing grades.
Ductibor® 1000 is already available for qualification in Europe and North America. Usibor® 2000 samples are available in Europe now and will be available in North America in early 2017.
Usibor® 2000 has been under development by ArcelorMittal for some time and is compatible with standard press hardening technologies and processes. An aluminium-silicon coated advanced high strength steel (AHSS), Usibor® 2000 is more than 30 percent stronger than its popular predecessor Usibor® 1500. According to Jean-Luc Thirion, head of ArcelorMittal Global R&D for automotive: “Usibor® 2000 could typically bring 10 to 15 percent weight savings when compared to existing hot stamping solutions.”
Usibor® 2000 can be used for monolithic parts or as LWBs in combination with Ductibor® 1000. When used in monolithic parts, Usibor® 2000 is ideal for applications where deformation must be avoided.
Ductibor® 1000 is ideal for monolithic parts which require higher ductility than Usibor® 1500 can provide. Ductibor® 1000 is also used to save weight on energy absorption applications. Typical examples include front and rear rails.
Usibor® 2000 is ideal for monolithic applications where deformation must be avoided.
LWBs give carmakers a unique opportunity to further optimise their vehicles by combining different grades of PHS to ensure the right steel is in the right place. This reduces the weight of the part significantly while improving safety and crash performance.
The properties of Ductibor® 1000 complement those of Usibor® 2000 when the two steels are combined into a single LWB. The LWBs created from this combination of steels offer several significant advantages including:
LWBs can combine Usibor® 2000, Usibor® 1500, Ductibor® 1000, or Ductibor® 500 to ensure the right steel is in exactly the right place.