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An improved process for producing ferritic stainless steel strips having reduced yield point elongation, comprising the following steps in sequence : (i) selecting conventionally produced 4 mm thick hot rolled ferritic stainless steel strips of composition (by weight %): C-0.05, Mn-0.45, Si-0.20, P-0.02, S-0.001, Cr-16.80, Ni-0.25, Mo-0.01, N-0.03, Al-0.015 and Fe-the balance; (ii) annealing the strips in a continuous annealing furnace at a temperature of 900°C for 4 minutes; (iii) pickling the annealed strips in the standard manner; (iv) cold rolling the strips for reducing thickness thereof to 0.5 mm in two stages, the reduction in thickness in the first stage being 55 to 65% and that in the second stage being 65 to 75% with final annealing of the strips for 1 minute in a continuous annealing furnaces; characterised in that the strips are finally annealed at a temperature of 880°C and subjected to minimum one skin-passing.

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Notices, Deadlines & Correspondence

Patent Information

Application #
Filing Date
26 October 1998
Publication Number
Publication Type
Invention Field
Status
Email
Parent Application
Patent Number
Legal Status
Grant Date
2005-09-09
Renewal Date

Applicants

STEEL AUTHORITY OF INDIA LTD.
ISPAT BHAWAN, LODHI ROAD, NEW DELHI

Inventors

1. CHANDI DUTTA SINGH
RDCIS/SAIL, DORANDA, RANCHI-834002
2. BIMAL KUMAR JHA
RDCIS/SAIL, DORANDA, RANCHI-834002
3. PRITI JHA
RDCIS/SAIL, DORANDA, RANCHI-834002
4. SUDHAKAR JHA
RDCIS/SAIL, DORANDA, RANCHI-834002

Specification

Documents

Application Documents

# Name Date
1 1900-cal-1998-granted-specification.pdf 2011-10-07
2 1900-cal-1998-granted-reply to examination report.pdf 2011-10-07
3 1900-cal-1998-granted-pa.pdf 2011-10-07
4 1900-cal-1998-granted-letter patent.pdf 2011-10-07
5 1900-cal-1998-granted-form 6.pdf 2011-10-07
6 1900-cal-1998-granted-form 3.pdf 2011-10-07
7 1900-cal-1998-granted-form 2.pdf 2011-10-07
8 1900-cal-1998-granted-form 1.pdf 2011-10-07
9 1900-cal-1998-granted-drawings.pdf 2011-10-07
10 1900-cal-1998-granted-description (complete).pdf 2011-10-07
11 1900-cal-1998-granted-correspondence.pdf 2011-10-07
12 1900-cal-1998-granted-claims.pdf 2011-10-07
13 1900-cal-1998-granted-assignment.pdf 2011-10-07
14 1900-cal-1998-granted-acceptance publication.pdf 2011-10-07
15 1900-cal-1998-granted-abstract.pdf 2011-10-07
16 01900-cal-1998-form-pa.pdf 2011-10-07
17 01900-cal-1998-form-5.pdf 2011-10-07
18 01900-cal-1998-form-3.pdf 2011-10-07
19 01900-cal-1998-form-2.pdf 2011-10-07
20 01900-cal-1998-form-1.pdf 2011-10-07
21 01900-cal-1998-drawings.pdf 2011-10-07
22 01900-cal-1998-description(complete).pdf 2011-10-07
23 01900-cal-1998-correspondence.pdf 2011-10-07
24 01900-cal-1998-claims.pdf 2011-10-07
25 01900-cal-1998-assignment.pdf 2011-10-07
26 01900-cal-1998-abstract.pdf 2011-10-07

ERegister / Renewals