precidur® HSM 700 HD
perform® 550 HD
CP-K® 780Y980T2
Modern car seat has to be a true all-rounder: it has to be lightweight yet crash-proof, take up very little installation space, be inexpensive to produce – and all of this, of course, without compromising comfort. The use of high-strength steel helps to meet these diverse requirements.
Take the issue of weight, for example: Today, each seat weighs on average around 12.5 kilograms – and that’s just the load-bearing steel seat structures. Together, then, the front and rear seat structures of a car can easily weigh in at around 50 kilos. A tailored portfolio of steel grades to meet to the specific seating requirements have a noticeable positive impact here and help reduce weight by up to 15 percent – at no extra cost.
Overview front seat structure
Seat rails, standard thickness 1.5 to 2.0 mm
Transverse tubes, standard thickness 2.0 to 2.5 mm
perform® 355
DP-K® 440Y780T HHE
CP-K® 570Y780T
Seat shell, standard thickness 0.8 mm
MHZ® 340
MHZ® 380
DP-K® 290Y490T
Cushion side member, standard thickness 1.6 mm
perform® 500 HD
CP-W® 660Y760T
DP-K® 700Y980T
Upper seatback crossbar, standard thickness 0.8 to 1.1 mm
MHZ® 420
Lower seatback crossbar, standard thickness 0.8 to 1.0 mm
DP-K® 440Y780T HHE
MHZ® 420
Backrest side member, standard thickness 0.8 to 1.1 mm
DP-K® 440Y780T HHE
DP-K® 590Y980T
DP-K® 700Y980T
Adapter unit, standard thickness 3.0 to 5.0 mm
precidur® HLB 22
precidur® HSM 700 HD
precidur® HSM 650 HD
scalur® S600MC
Seat height adjuster, standard thickness 3.0 to 5.0 mm
precidur® HLB 37
Articulated lever, standard thickness 3.0 to 5.0 mm
precidur® HSM 700 HD
Backrest side member
Seat structures are a complex system in which every single structural component is important. Take safety: The front seatback is stressed by the passenger in the event of a rear-end crash and by whatever’s on the rear seat or possibly in the trunk in a frontal collision. Accordingly, different crash load cases must be considered for the backrest side member, cushion side member, and seat shell.
A task made for our robust high strength dual-phase steel DP-K® 440Y780T HHE. With a rating of 800 MPa, this cold-rolled dual-phase steel is not only extremely strong but also easy to form, making it perfect for difficult-to-form structural components that are exposed in the event of a crash, such as the backrest side member.
Material recommendation:
- DP-K® 440Y780T HHE
DP-K® 590Y980T
DP-K® 700Y980T
Benefit: High strength with good formability for maximum weight savings
Cushion side member
Depending on the shape of the component in question, dual-phase steel DP-K® 700Y980T or highly ductile micro-alloyed steel perform® 500 HD can be used, e.g., for the cushion side member (the new HD steel grade is particularly easy to form).
Material recommendation:
- perform® 500 HD
Benefit: High strength and good formability
- CP-W® 660Y760T
Benefit: High yield and tensile strength as well as good bending and edge formability
- DP-K® 700Y980T
Benefit: High strength with good formability for maximum weight savings
Seat rails
Highly ductile micro-alloyed, high-strength perform® steels (hot wide strip) as well as precidur® steel grades made from Hohenlimburg precision steel in particular are ideal for classic cold-rolling processes and seat rail applications. Finally, the cold-rolled uncoated complex-phase steel CP-K® 780Y980T is another high-performance material in the 1,000 MPa strength class that features excellent forming properties and meets the highest thickness tolerance requirements – and not only for seat rails.
Material recommendation:
- perform® 550 HD
Benefit: High strength and good formability - precidur® HSM 700 HD
Benefit: Especially suited to complex forming processes - CP-K® 780Y980T2
Benfit: High lightweight potential
Adapter unit, seat height adjuster and articulated lever
The case-hardening and tempered steels and the highly ductile micro-alloyed fine-grain structural steels of the precidur® family, for example, offer hot-rolled precision strip with extremely tight thickness and profile tolerances that is ideally suited to making functional components such as adapter units, seat height adjusters and articulated levers.
Material recommendation adapter unit:
- precidur® HLB 22
Benefit: Good processing and forming properties in hot-rolled and annealed condition - precidur® HSM 650 HD
precidur® HSM 700 HD
Benefit: Especially suited to complex forming processes - scalur® S600MC
Benefit: High lightweight potential and best processing properties
Material recommendation seat height adjuster:
- precidur® HLB 37
Benefit: Good processing and forming properties in hot rolled and annealed condition
Material recommendation articulated lever:
- precidur® HSM 650 HD
precidur® HSM 700 HD
Benfit: Especially suited to complex forming processes
Overview rear seat structure
Rear seat panel, standard thickness 0.5 to 0.6 mm
DP-K® 290Y490T (tolerances ±0.05 mm, tighter tolerances on request)
MHZ® 420, standard thickness approx. 0.6 mm
HC460LA, standard thickness approx. 0.5 mm
Reinforcement brackets, standard thickness 2.0 to 2.5 mm
scalur® S420MC
Profiles, standard thickness 0.8 to 1.2 mm
DP-K® 700Y980T, ideal for roll forming
CP-K® 570Y780T
DP-K® 440Y780T
HC460LA
Rear seat panels and reinforcement brackets
While seat structures for front seats have the same or comparable structure depending on the car model, rear seat structures vary greatly depending on the vehicle, e.g. adjustable individual seats, divisible or non-divisible rear seat benches with profiles or tubes.
Micro-alloyed steels MHZ® 420 and HC460LA are predestined for forming operations such as flanging and beading and therefore ideally suited for the production of rear seat panels. Profiles and reinforcement brackets are used to meet the high crash requirements of the rear bench seat (e.g. load case: protection against load). Our steel grade scalur® S420MC, pickled micro-alloyed hot-rolled strip with extremely narrow thickness tolerances of up to ±0.05 mm and a very flat profile, offers not only the best processing properties but also high lightweighting potential.
Material recommendation rear seat panels:
- DP-K® 290Y490T (optional: suitable for laser hardening)
Benefit: Innovative lightweight solution - MHZ® 420, usual thickness approx. 0.6 mm
HC460LA, usual thickness approx. 0.5 mm
Benefit: Excellent forming properties for operations such as flanging and beading
Material recommendation reinforcement brackets:
- scalur® S420MC
Benefits:
- High lightweight potential and best processing properties
- Excellent suitability for MIG, MAG and laser welding
Profiles
Dual-phase steel DP-K® 700Y980T (ideally suited for roll forming) and complex-phase steel CP-K® 570Y780T are both suitable for rear seat structures in tubular design. Both steel grades combine high strength with good formability and offer high lightweighting potential.
Material recommendation:
- DP-K® 700Y980T
CP-K® 570Y780T
HC460LA
Benefits:
- High strength with good formability and high lightweight potential
- Ideal for structural components with high crash performance (load scenario: protection against cargo)
Overview products seat structures
Dual-phase steel, uncoated (UC)
| Steel grade |
Reference grade DIN EN 10152 |
Reference grade VDA 239-100 |
|---|---|---|
| DP-K® 290Y490T |
HCT490X | CR290Y490T-DP |
| DP-K® 330Y590T |
HCT590X | CR330Y590T-DP |
| DP-K® 440Y780T HHE1 | – | – |
| DP-K® 590Y980T2 | HCT980X | CR590Y980T-DP |
| DP-K® 700Y980T | HCT980XG | CR700Y980T-DP |
1. Steel grade with improved hole expansion | 2. Under development
Complex-phase steel, uncoated (UC)
| Steel grade |
Reference grade DIN EN 10152 |
Reference grade VDA 239-100 |
|---|---|---|
| CP-W® 660Y760T | HDT760C | HR660Y760T-CP |
| CP-K® 570Y780T | HCT780C | CR570Y780T-CP |
| CP-K® 780Y980T | HCT980C | CR780Y980T-CP |
Micro-alloyed fine-grain structural steel (Hot-rolled strip, hot-dip galvanized)
| Steel grade |
Reference grade DIN EN 10346 |
Reference grade VDA 239-100 |
Thickness1 from _ to in mm |
Width1 from _ to in mm |
|---|---|---|---|---|
| MHZ® 340 | HX340LAD | HR340LA | 1.50 – 4.00 | 900 – 1,550 |
| MHZ® 380 | HX380LAD | HR380LA | 1.50 – 4.00 | 900 – 1,550 |
| MHZ® 420 | HX420LAD | HR420LA | 1.50 – 4.00 | 900 – 1,550 |
| MHZ® 460 | HX460LAD | HR460LA | 1.80 – 3.00 | 900 – 1,500 |
1. Not all thickness and width combinations possible.
Highly ductile micro-alloyed steel for cold forming (Hot-rolled strip, uncoated)
VDA 239-100, DIN EN 10149-2
| Steel grade |
Reference grade DIN EN 10149-2 |
Reference grade VDA 239-100 |
Material no. |
Thickness1 from _ to in mm |
Width1 from _ to in mm |
|---|---|---|---|---|---|
| perform® 315 HD | S315MC | – | 1.0972 | 1.50 – 6.00 | 50 – 1,600 |
| perform® 340 HD | S340MC | HR340LA | – | 1.50 – 6.00 | 50 – 1,600 |
| perform® 355 HD | S355MC | – | 1.0976 | 1.50 – 6.00 | 50 – 1,600 |
| perform® 420 HD | S420MC | HR420LA | 1.0980 | 2.00 – 5.00 | 50 – 1,600 |
| perform® 460 HD | S460MC | HR460LA | 1.0982 | 2.00 – 5.00 | 50 – 1,600 |
| perform® 500 HD2 | S500MC | HR500LA | 1.0984 | 2.00 – 5.00 | 50 – 1.600 |
| perform® 550 HD | S550MC | HR550LA | 1.0986 | 2.00 – 5.00 | 50 – 1,600 |
1. Not all thickness and width combinations possible. | 2. Available in the product version scalur®.
Micro-alloyed steel for cold forming (Hot-rolled strip, uncoated)
VDA 239-100, DIN EN 10149-2
| Steel grade |
Reference grade DIN EN 10149-2 |
Reference grade VDA 239-100 |
Material no. |
THICKNESS1 from _ to in mm |
WIDTH1 from _ to in mm |
|---|---|---|---|---|---|
| perform® 300 | – | HR300LA | – | 1.50 – 20.00 | 50 – 2,030 |
| perform® 3152 | S315MC | – | 1.0972 | 1.50 – 20.00 | 50 – 2,030 |
| perform® 340 | – | HR340LA | – | 1.50 – 20.00 | 50 – 2,030 |
| perform® 3552 | S355MC | – | 1.0976 | 1.50 – 20.00 | 50 – 2,030 |
| perform® 3802 | – | HR380LA | 1.0978 | 1.50 – 20.00 | 50 – 2,030 |
| perform® 4202 | S420MC | HR420LA | 1.0980 | 1.75 – 20.00 | 50 – 2,030 |
| perform® 4602 | S460MC | HR460LA | 1.0982 | 1.75 – 20.00 | 50 – 2,030 |
| perform® 5002 | S500MC | HR500LA | 1.0984 | 1.75 – 16.00 | 50 – 2,030 |
| perform® 5502 | S550MC | HR550LA | 1.0986 | 2.00 – 8.50 | 60 – 1,850 |
| perform® 6002 | S600MC | – | 1.8969 | 3.00 – 9.50 | 80 – 1,750 |
| perform® 6502 | S650MC | – | 1.8976 | 3.00 – 10.50 | 80 – 1,750 |
| perform® 7002 | S700MC | HR700LA | 1.8974 | 3.00 – 12.00 | 80 – 1,750 |
1. Not all thickness and width combinations possible. | 2. Available in the product version scalur®.
Micro-alloyed fine-grain structural steel HD grades (Precision strip)
| Steel grade |
Standard designation DIN EN 10149-2 |
Standard designation VDA 239-100 |
Material no. |
Thickness1 from _ to in mm |
Width1 max. in mm |
|---|---|---|---|---|---|
| precidur® HSM 650 HD | S650MC | - | 1.8976 | 1.50 – 16.00 | 720 |
| precidur® HSM 700 HD | S700MC | HR700LA | 1.8974 | 1.50 – 16.00 | 720 |
1. Not all thickness and width combinations possible.
Boron-alloyed heat-treatable steel (Manganese-boron steel)
| Steel grade |
Standard designation DIN EN 10083 |
Material no. |
Thickness1 from _ to in mm |
Width1 max. in mm |
|---|---|---|---|---|
| precidur® HLB 22 | 22MnB5 | 1.5528 | 1.50 – 16.00 | 720 |
| precidur® HLB 37 | 37MnB4 | 1.5524 | 1.50 – 16.00 | 720 |
1. Not all thickness and width combinations possible.
Service: All on one material card
Every second new car is equipped with at least one Brose vehicle component. The portfolio also includes seat components and structures for which the successful family-owned company sources hot-rolled micro-alloyed steels from thyssenkrupp Steel. In a joint development project and with the support of thyssenkrupp Materials Processing Europe's supply chain expertise, the partners have examined various grades of our micro-alloyed scalur® steels and documented the results on material cards.
Hot-rolled micro-alloyed steels for the automotive industry
The pickled hot-rolled strip scalur® is characterized by very tight tolerances of up to ± 0.05 mm with a very flat profile. Users can thus order thinner strip and thus reduce the component weight, especially when using higher-strength steel grades. At the same time, the steel possesses excellent forming properties and a quality comparable to that of cold strip.
Simulting an emergency
How does the material behave in the event of a collision? And how in a forming operation? The reliable characterization of the material properties before it is used is of key importance for Brose. A set of material constants has been developed in cooperation with the application technology department of thyssenkrupp Steel and the Mannheim site of the Group’s own Service Centers of thyssenkrupp Materials Processing Europe.
Enrico Thiele, Brose Key Account Manager at thyssenkrupp Materials Processing Europe and Achim Peuster, Technical Customer Account Manager at thyssenkrupp Steel have worked together and in close coordination with the customer to ensure that the specific requirements of the automotive supplier are met. The basis for this cooperation were various experimental analyses to determine the characteristic values and subsequent simulations for validation purposes. In real-life tests, among other things, high-tech testing machines were used that deliver reliable results even for high strengths. In the next step, the experts selected the appropriate mathematical models to simulate the material properties in various programs. So far, thyssenkrupp Steel mainly prepared material constants of hot strip steels as standard dataset for simple simulations.
The material cards contain, for example, the mechanical-technological characteristic values from tensile and fracture tests as well as extensive plasticity and failure descriptions. The advantage for Brose is that the seat manufacturer can use the higher-quality complex data at an early stage of development to determine whether the geometry of a component will meet the load requirements.
Conserving valuable resources
The joint development work took six months. Both parties are satisfied with the result. After all, every virtual simulation in the run-up to production not only saves valuable resources, but also a lot of time.
This and the secure supply of materials via thyssenkrupp Materials Processing Europe's Service Centers is an important advantage for the just-in-time processes of the automotive industry.
Multiphase steels for safe and light vehicle seats
With two new high-strength, cold-rolled multiphase steels with special forming properties, thyssenkrupp Steel is supplying the automotive industry with ideal materials for weight-reduced seat structures.
- Application
Vehicle seats consist of complex safety and crash-relevant structural components. As is the case throughout vehicle construction, saving weight in these components is also a key issue. thyssenkrupp Steel offers two new steel solutions for this. Specifically, we are talking about uncoated dual- and complex-phase steels with strengths of 800 and 1,000 megapascals for lightweightstructural components with high crash relevance and forming complexity. Firstly, the dual-phase steel DP-K® 440Y780T HHE for components in the seat frame with good deep-drawing and elongation properties. The grade offers impressively high work hardening properties, and absorbs significantly more energy in the event of a crash than conventional microalloyed steels. This is complemented by the complex-phase steel CP-K® 780Y980T, which increases the functional reliability of seat rails thanks to its maximum strength. Both materials allow a reduction in material thickness without limiting function and safety. - Processing
In addition to the possibility of weight optimization and good crash performance, both steels offer very good forming properties – the best prerequisite for efficient production of complex seat components. With its property profile, the robust DP-K® 440Y780T HHE is suitable for deep-drawn, flanged, complex structural elements such as the backrest side section. Its special analysis makes the grade more resistant to edge cracking in complex forming geometries. The CP-K® 780Y980T has an even higher hole expansion capacity, can be optimally processed by roll forming, bending and edging and is ideal for seat rails. - Sustainable lightweight construction
Thanks to high-strength multiphase steels, seat components can be designed thinner, thus reducing weight – and also saving CO2. With bluemint® Steel, the high-quality flat steel with reduced carbon footprint, maximum CO2 savings are achieved – with the same excellent material and processing properties as the existing grades.
