Global Patent Index - EP 0870848 A1

EP 0870848 A1 19981014 - Niobium containing steel and process for making flat products from this steel

Title (en)

Niobium containing steel and process for making flat products from this steel

Title (de)

Niobium enthaltender Stahl und Verfahren zur Herstellung von Flachprodukten aus diesem Stahl

Title (fr)

Acier au niobium et procédé de fabrication de produits plats à partir de celui-ci

Publication

EP 0870848 A1 19981014 (FR)

Application

EP 98200844 A 19980318

Priority

BE 9700270 A 19970327

Abstract (en)

Extra mild niobium steel is free of titanium and comprises no more than following by weight: 0.100% carbon, 1.000% manganese, 0.100% phosphorous, 0.020% sulphur, 0.080% aluminium, 0.012% nitrogen and 0.500% silicon, plus an amount of niobium stoichiometrically less than the N content and enough boron or zirconium to fix all the N which is not fixed by the Nb. The rest is iron plus any impurities. Also claimed is casting the steel into a slab at least 1000 degrees C, then hot rolling to form a strip with a final rolling temperature above Ar3, winding into a reel between 500 and 750 degrees C, cold rolling to the desired thickness, annealing to recrystallise and finally shaping the finished article.

Abstract (fr)

Acier au niobium, extra doux, calmé à l'aluminium et exempt de titane, pour produits plats laminés à froid et recuits, contenant une teneur en niobium stoechiométriquement inférieure à celle de l'azote et une teneur en bore ou en zirconium suffisante pour fixer l'azote non fixé, et procédé de fabrication de produits plats à base de cet acier.

IPC 1-7

C22C 38/12; C22C 38/14; C21D 8/04

IPC 8 full level

C21D 8/04 (2006.01); C21D 9/48 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01)

CPC (source: EP)

C21D 8/0426 (2013.01); C21D 9/48 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C21D 8/041 (2013.01); C21D 8/0436 (2013.01); C21D 8/0473 (2013.01)

Citation (search report)

  • [DA] EP 0421087 A2 19910410 - KOBE STEEL LTD [JP]
  • [A] EP 0574814 A2 19931222 - KAWASAKI STEEL CO [JP]
  • [DA] EP 0101740 A1 19840307 - KAWASAKI STEEL CO [JP]
  • [DA] DE 19547181 C1 19961010 - KRUPP AG HOESCH KRUPP [DE]
  • [DA] WO 8907158 A1 19890810 - SALZGITTER PEINE STAHLWERKE [DE]
  • [A] DATABASE WPI Section Ch Week 8434, Derwent World Patents Index; Class M24, AN 84-211090, XP002046097
  • [A] DATABASE WPI Section Ch Week 8619, Derwent World Patents Index; Class M27, AN 86-121979, XP002046098
  • [A] DATABASE WPI Section Ch Week 9246, Derwent World Patents Index; Class M14, AN 92-376689, XP002046099
  • [A] DATABASE WPI Section Ch Week 8620, Derwent World Patents Index; Class M27, AN 86-127775, XP002046100
  • [A] DATABASE WPI Section Ch Week 8045, Derwent World Patents Index; Class M23, AN 80-79688C, XP002046101

Designated contracting state (EPC)

AT BE CH DE DK ES FI FR GB GR IE IT LI LU NL PT SE

DOCDB simple family (publication)

EP 0870848 A1 19981014; EP 0870848 B1 20030910; AT E249528 T1 20030915; BE 1011066 A3 19990406; DE 69817900 D1 20031016; DE 69817900 T2 20040722; DK 0870848 T3 20040112; ES 2207787 T3 20040601; PT 870848 E 20040130

DOCDB simple family (application)

EP 98200844 A 19980318; AT 98200844 T 19980318; BE 9700270 A 19970327; DE 69817900 T 19980318; DK 98200844 T 19980318; ES 98200844 T 19980318; PT 98200844 T 19980318