The invention relates to a steel alloy for a low alloy steel for producing high-tensile, weldable, hot-rolled seamless steel tubing, in particular construction tubing. The chemical composition (in % by mass) is: 0.15-0.18% C; 0.20-0.40% Si; 1.40-1.60% Mn; max. 0.05% P; max. 0.01% S; >0.50-0.90% Cr; >0.50-0.80% Mo; >0.10-0.15% V; 0.60-1.00% W; 0.0130-0.0220% N; the remainder …

Legal parties

Inventors (applicants): Markus Schütz, Christoph Kaucke, Charles Stallybrass, Heinz Sanders, André Schneider, Guido Kubla
Assignees (initial): Vallourec Deutschland GmbH (Duesseldorf, DE)
Agents: Henry M. Feiereisen LLC. (attorney)

The application was examined by Roy King (USPTO dept. 1733), Caitlin Kiechle


  • 1. A steel alloy for a low-alloy steel for producing high-strength, weldable, hot-rolled seamless steel …
  • 2. The steel alloy of the claim 1 , wherein W has a concentration of 0.7-0.9%. …
  • 3. The steel alloy of claim 1 wherein the steel alloy has a yield strength …

International priority data

DE: 10 2008 010 749 / Feb. 20, 2008 (national)

Cited documents


  • WO WO 2007/033635 A, Mar. 1, 2007
  • Hagen et al. US 2002/0150497 A1 / 420/90, Oct. 1, 2002
  • DE 199 42 641 A1, Mar. 1, 2001
  • DE 44 46 709 A1, Jun. 1, 1996
  • DE 36 28 712 A1, Feb. 1, 1988
  • CA 2622410 A1, Mar. 1, 2007


Cross-References to Related Applications

This application is the U.S. National Stage of International Application No. PCT/DE2009/000088, filed Jan. 23, 2009, which designated the United States and has been published as International Publication No. WO 2009/103259 …

Detailed Description of Preferred Embodiments

None The steel alloy according to the invention improves over the development of the tungsten-alloyed fine-grain structural steel disclosed in DE 199 42 641 A1. Experiments to date have not shown …

More details about Steel Alloy for a Low-Alloy Steel for Producing High-Strength Seamless Steel Tubing

Miscellaneous patent data

The claim 1 is exemplary as chosen by the examiner, the application was published on Jan. 23, 2009, the protection scope is defined by 6 claims, the assignee is categorized as a foreign company or corporation, the invention is titled Steel Alloy for a Low-Alloy Steel for Producing High-Strength Seamless Steel Tubing, located in Duesseldorf (DE), the assignee organization is Vallourec Deutschland GmbH, the grant publication date is Oct. 21, 2014, the agent's company name is Henry M. Feiereisen LLC., categorized under Vanadium containing as a primary classification, similar classification categories are Alloys based on aluminium, based on carbides or carbonitrides, Refractory metal containing, Manganese containing, Rhodium containing, Alloys based on rhenium or a refractory metal not mentioned in groups C22C 14/00 or C22C 16/00, based on oxides, e.g. oxide ceramic fibres, Superplastic, Alloys based on an alkali or an alkaline earth metal, containing nickel, Alloys based on tin, Titanium, Alloys based on antimony or bismuth, coating, e.g. with a protective or activated covering, Titanium containing, the recorded inventor's name is Kaucke Christoph, was examined by Roy King, the main examiner, Caitlin Kiechle, the assistant (1733 USPTO department), developed by André Schneider et al., the application number is 12/918,457 (U.S.), the patent extension term is 113 days, the grant number is 08865061, particularly claims a steel alloy for a low-alloy steel for producing high-strength, weldable…, the recorded applicant's name is André Schneider.

Invention classification information

The invention is classified under with molybdenum or tungsten, with vanadium, with titanium or zirconium, Tungsten containing, containing tungsten, tantalum, molybdenum, vanadium or niobium, Tungsten containing, Nickel containing, Vanadium, titanium or zirconium containing, Molybdenum containing, Titanium, zirconium or niobium containing, Vanadium containing. The designated search classifications include Molybdenum containing, containing manganese, Nitrogen containinig, with molybdenum or tungsten, containing silicon, with vanadium, for tubular bodies or pipes, Nickel containing, containing tungsten, tantalum, molybdenum, vanadium or niobium, with nickel, Molybdenum containing, containing chromium, with titanium or zirconium, with more than 1.5% by weight of manganese, with niobium or tantalum, Vanadium, tantalum or niobium containing.

Patent details
Publication number 08865061
Publication date Oct. 21, 2014
Kind code B2
Application number 12/918,457
Application date Jan. 23, 2009
Application type U
Application series code 12
Int. pub. country WO
Int. pub. number WO2009/103259
Int. publication Aug. 27, 2009
Int. filing country WO
Int. filing PCT/DE2009/000088
Filed internationally Jan. 23, 2009
National stage date Nov. 22, 2010
Extension term 113
National classification 420/111
Total number of claims 6
Exemplary claims 1
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