Metal treatment – Stock – Ferrous
Reexamination Certificate
1999-10-06
2001-02-13
Ip, Sikyin (Department: 1742)
Metal treatment
Stock
Ferrous
C148S334000, C420S106000
Reexamination Certificate
active
06187113
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a steel alloy for pipes, sheet metal or sections for manufacturing bumpers for motor vehicles.
2. Description of the Related Art
Bumpers are integrated at the front and the rear of a motor vehicle between the plastic shell which closes off the vehicle body and the frame of the motor vehicle. The purpose of the bumpers is to absorb light impacts and collisions without or with only little damage to the vehicle. The manner of operation of a bumper is to convert the kinetic energy resulting from an impact into work of deformation, so that no plastic deformations occur at the body structure, particularly at the side rails or side members of the body.
Consequently, a bumper must have sufficient strength as well as a high elasticity and bending stiffness in order to be able to absorb and conduct away the occurring forces and moments.
Since bumpers are manufactured in large quantities primarily from pipes, sheet metal or sections using the cold deformation method, it is additionally necessary to ensure an economical production where particularly the wear at the deformation tools must be kept low because any occurring wear has a disadvantageous effect on the production costs and causes stoppage and maintenance periods.
SUMMARY OF THE INVENTION
Therefore, it is the primary object of the present invention to provide a steel alloy for pipes, sheet metal or sections which are used for manufacturing bumpers for motor vehicles in an efficient and economical manner, wherein the steel alloy provides material properties which are suitable for this structural component, particularly a high elasticity and a good energy absorption capacity.
In accordance with the present invention, the steel alloy for pipes, sheet metal or sections for manufacturing bumpers of motor vehicles contains, in percent by weight, 0.17 to 0.20% carbon, 1.70 to 2.20% manganese, 0.45 to 0.75% chromium, 0.10 to 0.35% molybdenum, 0.03 to 0.05% aluminum, 0.01 to 0.05% titanium, 0.01 to 0.12% vanadium, 0.025 to 0.06% niobium, 0.0001 to 0.10% zirconium, 0.002 to 0.003% Boron, 0.01 to 0.04% nitrogen, up to 0.15% silicon and up to 0.025% phosphorus and up to 0.010% sulfur, wherein the remainder is iron including impurities caused from smelting, and wherein the sum of the alloy components titanium, vanadium and niobium is between 0.16 and 0.25%.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of the disclosure. For a better understanding of the invention, its operating advantages, specific objects attained by its use, reference should be had to the descriptive matter in which there are described preferred embodiments of the invention.
REFERENCES:
patent: 55-107726 (1980-08-01), None
patent: 09235617 (1997-09-01), None
Benteler AG
Ip Sikyin
Kueffner Friedrich
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