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Low carbon alloy steel tube having ultra high strength and excellent toughness at low temperature and method of manufacturing the same

A technology of low-carbon alloy steel and alloy steel pipe, which is applied in the direction of manufacturing tools, furnace types, furnaces, etc., and can solve problems such as endangering the integrity of pressure accumulators

Active Publication Date: 2007-01-24
TENARIS CONNECTIONS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been observed that these welds can crack or become damaged, compromising the integrity of the accumulator, and possibly the operation of the air bag

Method used

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Embodiment Construction

[0017] best practice

[0018] While the permissible embodiments of this invention come in various forms, it should be understood that the preferred embodiment to be described hereinafter discloses an example of the invention and is not intended to limit the invention to the embodiment shown.

[0019] The present invention relates to a steel pipe for placing an airbag pressure vessel. More specifically, the present invention relates to a low carbon ultra high strength steel grade for seamless pressure vessels, which guarantees ductility at -60°C, ie ductile-brittle transition temperature (DBTT) below -60°C.

[0020] More specifically, the present invention relates to a chemical composition and a manufacturing process for seamless steel pipes for making airbags.

[0021] A schematic diagram of a possible manufacturing method for producing seamless low carbon ultra high strength steel is as follows:

[0022] 1. Steelmaking

[0023] 2. Cast steel

[0024] 3.Tue hot rolled

[...

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PUM

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Abstract

A low carbon alloy steel tube and a method of manufacturing the same, in which the steel tube consists essentially of, by weight: about 0.06% to about 0.18% carbon; about 0.5% to about 1.5% manganese; about 0.1% to about 0.5% silicon; up to about 0.015% sulfur; up to about 0.025% phosphorous; up to about 0.50% nickel; about 0.1% to about 1.0% chromium; about 0.1% to about 1.0% molybdenum; about 0.01% to about 0.10% vanadium; about 0.01% to about 0.10% titanium; about 0.05% to about 0.35% copper; about 0.010% to about 0.050% aluminum; up to about 0.05% niobium; up to about 0.15% residual elements; and the balance iron and incidental impurities. The steel has a tensile strength of at least about 145 ksi and exhibits ductile behavior at temperatures as low as -60 DEG C.

Description

[0001] Related applications [0002] This application claims priority to U.S. Provisional Patent Application No. 60 / 509806, filed October 10, 2003, and U.S. Non-Provisional Patent Application No., filed October 5, 2004. technical field [0003] The present invention relates to a low-carbon alloy steel pipe with ultra-high strength and excellent toughness at low temperature, and a manufacturing method of the steel pipe. Said steel tube is suitable for the manufacture of container components for automotive restraint system components, an example being inflators for automotive airbags. Background technique [0004] Airbag inflators used in vehicle occupant restraint systems are required to meet stringent structural and functional standards. Therefore, strict procedures must be employed in the manufacturing process. While field trials have shown that the industry has met past structural and functional standards, improved and / or new properties are needed to meet development nee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/10C21D9/08C22C38/00C22C38/20C22C38/22C22C38/24
Inventor 埃德高多·奥斯卡·洛佩斯爱德华多·阿尔特舒勒
Owner TENARIS CONNECTIONS
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