EP 3625374 A1 20200325 - METHOD FOR PRODUCING A WEAR-RESISTANT STEEL PIPE, WEAR-RESISTANT STEEL PIPE, AND USE OF SUCH A STEEL PIPE
Title (en)
METHOD FOR PRODUCING A WEAR-RESISTANT STEEL PIPE, WEAR-RESISTANT STEEL PIPE, AND USE OF SUCH A STEEL PIPE
Title (de)
VERFAHREN ZUR HERSTELLUNG EINES VERSCHLEIßFESTEN STAHLROHRS, VERSCHLEIßFESTES STAHLROHR UND VERWENDUNG EINES SOLCHEN STAHLROHRS
Title (fr)
PROCÉDÉ DE FABRICATION D'UN TUYAU EN ACIER RÉSISTANT À L'USURE, TUYAU EN ACIER RÉSISTANT À L'USURE ET UTILISATION DE CE TYPE DE TUYAU EN ACIER
Publication
Application
Priority
- DE 102017110631 A 20170516
- EP 2018062099 W 20180509
Abstract (en)
[origin: WO2018210673A1] The invention is used for the large-scale production of wear-resistant steel pipes with an optimised service life. To this end, the method according to the invention comprises the following work steps: a) providing a steel sheet (2) which consists of a wear-resistant, annealable steel and is provided in a non-annealed or tempered state; b) shaping the steel sheet (2) into a tubular preform, in which two longitudinal edges of the steel sheet (2) are positioned opposite each other and delimit a welded joint between them; c) welding the longitudinal edges delimiting the welded joint to form a weld seam (3) which closes the welded joint; d) heat-treating the steel pipe (1) obtained after step c), wherein the heat treatment comprises the following steps: d.1) heating the steel pipe (1) at an average heating rate of 5-400 K/s to a holding temperature which is ≥ the Ac3 temperature of the steel and is ≤ 1100°C; d.2) holding the steel pipe (1) at the holding temperature for 1-120 s; and d.3) cooling the steel pipe (1) at an average cooling rate of 10-600 K/s to room temperature. Figures 2a-2c are intended for the abstract.
IPC 8 full level
C21D 9/08 (2006.01); C21D 1/18 (2006.01); C21D 9/14 (2006.01); C21D 9/50 (2006.01)
CPC (source: EP US)
B21C 37/08 (2013.01 - US); B23K 13/025 (2013.01 - US); C21D 1/18 (2013.01 - EP); C21D 8/105 (2013.01 - US); C21D 9/08 (2013.01 - EP); C21D 9/085 (2013.01 - EP US); C21D 9/14 (2013.01 - EP US); C21D 9/50 (2013.01 - EP); C21D 9/505 (2013.01 - EP US); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C22C 38/08 (2013.01 - US); C22C 38/12 (2013.01 - US); C22C 38/14 (2013.01 - US); C22C 38/32 (2013.01 - US); C22C 38/44 (2013.01 - EP); C22C 38/50 (2013.01 - EP); C22C 38/54 (2013.01 - EP); B21C 37/08 (2013.01 - EP); B23K 2101/06 (2018.07 - US); Y02P 10/25 (2015.11 - EP)
Citation (search report)
See references of WO 2018210673A1
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)
WO 2018210673 A1 20181122; BR 112019023643 A2 20200602; CA 3063796 A1 20191209; CN 110637099 A 20191231; DE 102017110631 A1 20181122; EP 3625374 A1 20200325; US 2020165693 A1 20200528
DOCDB simple family (application)
EP 2018062099 W 20180509; BR 112019023643 A 20180509; CA 3063796 A 20180509; CN 201880032759 A 20180509; DE 102017110631 A 20170516; EP 18726087 A 20180509; US 201816611318 A 20180509