Title:
MANUFACTURE OF WELDED STEEL STRUCTURE AND WELDED STEEL STRUCTURE
Document Type and Number:
Japanese Patent JP3339403
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a steel structure of superior tenacity satisfying a specific index TSp as well as Al/O by carrying out a submerged arc welding with a usage of a steel base material having a specific tensile strength, a welding wire for high tensile steel of specific composition and a flux of specific basicity.
SOLUTION: A steel base having a tensile strength 800-1,100 Mpa, a welding wire for high tensile steel containing, 0.005-0.2 wt.% Al, 0.02 wt.% or less O, and a high basicity flux, a basicity of which shown by a formula III is 1.0-3.0 are used so that an index TSp shown by a formula I is 800-1,000, and Al/O satisfies a formula II. Symbols of elements in the formula I and II represent percentage of each element contained in the steel (weight%), chemical formulas in the formula III represent percentage of chemical compound contained in a flux (weight%). Thus, a steel structure, especially a welded steel pipe is obtainable, wherein an acicular ferrite acts as a main phase of set-up by correctly controlling Al/O, a welding metal is of high strength and tenancy, and a tension strength is 800-1,100 Mpa.
Inventors:
Makoto Matsuura
Masahiko Hamada
Masahiko Hamada
Application Number:
JP7039998A
Publication Date:
October 28, 2002
Filing Date:
March 19, 1998
Export Citation:
Assignee:
SUMITOMO METAL INDUSTRIES,LTD.
International Classes:
B23K9/18; B23K9/00; B23K9/23; B23K35/30; B23K35/362; C22C38/00; C22C38/06; C22C38/58; (IPC1-7): B23K9/18; B23K9/00; B23K9/23; B23K35/30; B23K35/362; C22C38/00; C22C38/06; C22C38/58
Domestic Patent References:
| JP8257789A | ||||
| JP5375A | ||||
| JP3285770A |
Attorney, Agent or Firm:
Morio Mori (1 outside)