MANUFACTURE OF FERRITIC STAINLESS STEEL EXCELLENT IN SURFACE CHARACTERISTIC

Japanese Patent JP3779784

B2

PROBLEM TO BE SOLVED: To provide a method for manufacture of a ferritic stainless steel, capable of preventing the occurrence of roping at the time of cold rolling in the process where hot rolled plate annealing is omitted.
SOLUTION: A ferritic stainless steel, having a composition which consists of, by weight, 0.025-0.080% C, 0.0010-0.035% N, 11.0-20.0% Cr, ≤0.010% S, ≤0.04% P, 0.01-1.0% Mn, 0.01-1.0% Si, ≤0.5% Ni, ≤0.5% Cu, ≤0.2% Mo, ≤0.010% O, >0.005-0.05% B, 0.001-0.5% V, and the balance Fe with inevitable impurities and in which the value of γp represented by an equation γp=420×C +470×N+23×Ni+12×Cu+7×Mn-11.5×Cr-11.5×Si-11×Mo-52×Al-49×Ti+189 is regulated to 20-60%, is used. At the time of hot-rolling this ferritic stainless steel, heating temp. is regulated to 1150-1300°C and cumulative draft at ≥1100°C is regulated to ≥40% at the time of roughing, and successively, finish rolling is carried out and coiling temp. is regulated to ≤600°C. Then, acid pickling is applied without performing hot rolled plate annealing, and cold rolling and final annealing are carried out.

WO/2020/115637	COLD ROLLED AND ANNEALED STEEL SHEET, METHOD OF PRODUCTION THEREOF AND USE OF SUCH STEEL TO PRODUCE VEHICLE PARTS
JP2019081929	NICKEL-CONTAINING STEEL PLATE AND METHOD FOR MANUFACTURING THE SAME

Masayuki Abe
Kimura Ken
Senuma Takehide
Toshihiko Ozeki

JP33736296A

May 31, 2006

December 17, 1996

Click for automatic bibliography generation  

Nippon Steel Corporation

C21D8/02; C21D9/46; C21D6/00; C22C38/00; C22C38/32; C22C38/54; (IPC1-7): C21D9/46; C21D6/00; C21D8/02; C22C38/00; C22C38/32; C22C38/54

JP8049017A
JP4035551B2
JP59226150A
JP1201445A
JP10036911A

Hiroaki Tamura

Previous Patent: GRAIN DISCHARGE DEVICE FOR COMBINE

Next Patent: REFRACTORY TIGHT SEALING PACKING MATERIAL