| 摘要 |
A process for the production of austenitic stainless steel strips having as case a good weldability, comprising the operations of: solidification in a mold of a continuous casting apparatus with twin counterrotatng rolls, a strip having a thickness comprised between 1 to 5 mm and having the following composition in percent by weight: Cr 17-20; Ni 6-11; c<0.04; n<0.04; s<0.01; Mn<1.5; Si<1.0; Mo 0-3; Al<0.03; and possibly, Ti, Nb, Ta so that: Ti+0.5(Nb+Ta)>6C-3S with proviso that Ti>6S, or NB+Ta>1C with the proviso that TI<6S; being in any case Nb+Ti+Ta<1.0; the remaining part being substantially Fe with a delta-ferrite volume percentage comprised between 4 and 10% calculated with the formula: delta-ferrite=(Creq/Nieq-0.728)x500/3 wherein: Creq/Nieq=[Cr+Mo+1.5Si+)0.5Nb+0.25Ta+2.5(Al+Ti)+18]/[Ni+30(C+N)+0.5Mn+36]; and, possibly, heating the strip at a temperature between 900 to 1200° C. for a period of time less than 5 minutes. Subject of the invention is also the stainless steel strip obtained with the process and the use thereof for manufactured welded products, i.e. welded tubes.
|
