EP 3110980 A1 20170104 - METHOD FOR PRODUCING HOT-ROLLED SEAMLESS PIPES FROM TRANSFORMABLE STEEL, IN PARTICULAR FOR PIPELINES FOR DEEP-WATER APPLICATIONS, AND CORRESPONDING PIPES
Title (en)
METHOD FOR PRODUCING HOT-ROLLED SEAMLESS PIPES FROM TRANSFORMABLE STEEL, IN PARTICULAR FOR PIPELINES FOR DEEP-WATER APPLICATIONS, AND CORRESPONDING PIPES
Title (de)
VERFAHREN ZUR HERSTELLUNG VON WARMGEWALZTEN, NAHTLOSEN ROHREN AUS UMWANDLUNGSFÄHIGEM STAHL, INSBESONDERE FÜR ROHRLEITUNGEN FÜR TIEFWASSERANWENDUNGEN UND ENTSPRECHENDE ROHRE
Title (fr)
PROCÉDÉ DE FABRICATION DE TUBES LAMINÉS À CHAUD SANS CORDON EN ACIER TRANSFORMABLE, NOTAMMENT POUR DES CONDUITES TUBULAIRES DESTINÉES À DES APPLICATIONS EN EAU PROFONDE, ET TUBES CORRESPONDANTS
Publication
Application
Priority
- DE 102014102452 A 20140225
- EP 2015053707 W 20150223
Abstract (en)
[origin: CA2940121A1] The invention relates to a method for producing hot-rolled seamless pipes (1) from transformable steel, in particular for pipelines for deep-water applications. The pipe ends (3) are hot-upsetted in order to achieve a thickened wall portion after a final rolling process of the pipes (1). The aim of the invention is to produce pipes with excellent fatigue, corrosion, and welding properties. This is achieved in that a pre-selected ratio between a wall thickness of the pipe end (3) and a wall thickness of a wall body (2) adjoining the pipe end (3) is set by the hot-upsetting process such that a pipe (1) is achieved with a pipe end (3) which has a lower strength than the pipe body (2) after a uniform tempering process of the entire pipe (1) following the hot-upsetting process by using a previously ascertained wall thickness-dependent cooling rate during the tempering process.
IPC 8 full level
C21D 8/10 (2006.01); C21D 9/14 (2006.01); C22C 38/04 (2006.01)
CPC (source: CN EP KR US)
C21D 1/18 (2013.01 - EP US); C21D 1/613 (2013.01 - EP US); C21D 7/13 (2013.01 - CN EP KR US); C21D 8/105 (2013.01 - CN EP KR US); C21D 9/085 (2013.01 - EP US); C21D 9/14 (2013.01 - CN EP KR US); C22C 38/001 (2013.01 - CN EP US); C22C 38/002 (2013.01 - CN EP US); C22C 38/008 (2013.01 - CN); C22C 38/02 (2013.01 - CN EP US); C22C 38/04 (2013.01 - CN EP KR US); C22C 38/06 (2013.01 - EP US); C22C 38/14 (2013.01 - CN); C22C 38/16 (2013.01 - CN); C22C 38/18 (2013.01 - CN); C22C 38/24 (2013.01 - EP US); C22C 38/26 (2013.01 - EP US); C22C 38/28 (2013.01 - EP US); C21D 2211/002 (2013.01 - CN EP KR US); C21D 2221/01 (2013.01 - CN EP KR US)
Citation (search report)
See references of WO 2015128282A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
DE 102014102452 A1 20150827; AR 099570 A1 20160803; AU 2015222278 A1 20160915; AU 2015222278 B2 20190117; CA 2940121 A1 20150903; CN 106232837 A 20161214; EA 201691449 A1 20161230; EP 3110980 A1 20170104; JP 2017512254 A 20170518; KR 20160127752 A 20161104; MX 2016011042 A 20170309; SG 11201607034U A 20161028; US 2016362759 A1 20161215; WO 2015128282 A1 20150903
DOCDB simple family (application)
DE 102014102452 A 20140225; AR P150100560 A 20150225; AU 2015222278 A 20150223; CA 2940121 A 20150223; CN 201580020871 A 20150223; EA 201691449 A 20150223; EP 15708140 A 20150223; EP 2015053707 W 20150223; JP 2016553447 A 20150223; KR 20167024466 A 20150223; MX 2016011042 A 20150223; SG 11201607034U A 20150223; US 201515121271 A 20150223