Global Patent Index - EP 1040206 A1

EP 1040206 A1 2000-10-04 - RUST-RESISTANT CONSTRUCTIONAL STEEL AND METHOD FOR PRODUCING THE SAME

Title (en)

RUST-RESISTANT CONSTRUCTIONAL STEEL AND METHOD FOR PRODUCING THE SAME

Title (de)

NICHROSTENDER BAUSTAHL UND VERFAHREN ZU SEINER HERSTELLUNG

Title (fr)

ACIER DE CONSTRUCTION INOXYDABLE ET SON PROCEDE DE PRODUCTION

Publication

EP 1040206 A1 (DE)

Application

EP 98966508 A

Priority

  • DE 9803583 W
  • DE 19755409 A

Abstract (en)

[origin: DE19755409A1] The invention relates to a method for producing rust-resistant constructional steels which can be used for sheets, strips, pipes, bars etc., in a wide range of areas of application. One preferred use for the inventive steels is the production of smooth or ribbed, weldable concrete steels, i.e. rust-resistant reinforcement steels for reinforced concrete construction. The aim of the invention is to produce rust-resistant, weldable constructional steels which can be classified as martensitic or ferritic-martensitic, which can be manufactured without annealing and cold-forming according a simplified method, and which have at least equivalent material characteristics. According to the invention, the desired characteristics of the rust-resistant constructional steels, such as resistance and strength characteristics, weldability and resistance to corrosion are obtained by means of thermomechanical treatment using the rolling heat instead of annealing and subsequent cold-forming. On cooling, the rust-resistant martensitic or ferritic-martensitic constructional steels were found to have obtained the same or better properties directly from the rolling heat as if they had been heat-treated and then cold-formed. The invention therefore provides a method for producing rust-resistant constructional or concrete steel without annealing and cold-forming, and therefore more cheaply.

IPC 1-7 (main, further and additional classification)

C21D 8/08; C21D 8/00; C22C 38/04; C22C 38/42; C22C 38/44; C22C 38/56

IPC 8 full level (invention and additional information)

C21D 8/06 (2006.01); C21D 8/08 (2006.01); B21B 1/16 (2006.01); B21B 3/02 (2006.01)

CPC (invention and additional information)

C21D 8/065 (2013.01); C21D 8/08 (2013.01); B21B 1/163 (2013.01); B21B 3/02 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01)

Citation (search report)

See references of WO 9931283A1

Designated contracting state (EPC)

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

DOCDB simple family

DE 19755409 A1 19990617; AT 214107 T 20020315; BR 9813553 A 20001003; CN 1281514 A 20010124; DK 1040206 T3 20020617; EP 1040206 A1 20001004; EP 1040206 B1 20020306; ES 2172262 T3 20020916; WO 9931283 A1 19990624