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US 2018/0023156 A1Published application
Lightweight door beam, composition thereof and method of manufacturing the same
AssigneesHyundai America Technical Center, Inc., Hyundai Motor Company, Kia Motors Corporation
InventorsAlex Khutorsky, Jonghyun Kim
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Abstract
A steel composition, a reinforcement part of a vehicle using the steel composition and a method of manufacturing the reinforcement part using the steel composition are provided. In particular, the steel composition includes increased content of carbon components and the steel composition is processed by rapid heating and immediate quenching.
Claims16
A steel composition comprising:
- carbon (C) in an amount of about 0.23 to 0.35 wt %;
- manganese (Mn) in an amount of about 0.75 to 1.5 wt %;
- silicon (Si) in an amount of about 0.20 to 0.40 wt %;
- aluminum (Al) in an amount of about 0.02 to 0.05 wt %;
- boron (B) in an amount of about 0.0005 to 0.0025 wt %;
- chromium (Cr) in an amount of about 0.1 to 0.4 wt %;
- titanium (Ti) in an amount of about 0.01 to 0.03 wt %,
- sulfur (S) less than about 0.03 wt %;
- phosphorus (P) less than about 0.02 wt %;
- and
- iron (Fe) constituting the remaining balance of the steel composition,
- all the wt % is based on the total weight of the steel composition.
9 more elements
A method for manufacturing a boron steel product, comprising:
- pre-heating a steel composition to a first predetermined temperature;
- heat treating, by an induction heating unit, the steel composition to a second predetermined temperature;
- and
- cooling, by a cooling unit, the steel composition to a third predetermined temperature,
- wherein a temperature of the steel composition is increased by the induction heat unit to the second predetermined temperature at a rate greater than about 350 to 400° C./sec and the second predetermined temperature is maintained for less than about 5 second,
- wherein the steel composition comprises:
- carbon (C) in an amount of about 0.28 to 0.35 wt %;
- manganese (Mn) in an amount of about 1.1 to 1.4 wt %;
- silicon (Si) in an amount of about 0.25 to 0.35 wt %;
- aluminum (Al) in an amount of about 0.03 to 0.04 wt %;
- boron (B) in an amount of about 0.0008 to 0.0012 wt %;
- chromium (Cr) in an amount of about 0.20 to 0.35 wt %;
- titanium (Ti) in an amount of about 0.015 to 0.025 wt %;
- sulfur (S) less than about 0.01 wt %;
- phosphorus (P) less than about 0.015 wt %, and
- iron (Fe) constituting the remaining balance of the steel composition,
- all the wt % is based on the total weight of the steel composition.
14 more elements
Dependencies are inferred from the claim text.