STEEL PLATE FOR SPIRAL FINS OF HEAT EXCHANGER AND PRODUCTION THEREOF

Title:

STEEL PLATE FOR SPIRAL FINS OF HEAT EXCHANGER AND PRODUCTION THEREOF

Document Type and Number:

Japanese Patent JPS581060

Kind Code:

A

Abstract:

PURPOSE: To provide a steel plate of superior workability and high temp. oxidation resistance for spiral fins of heat exchangers by contg. C, Si, Mn, P, S, Cr, Al, N in iron under spicified ratio thereof.

CONSTITUTION: The steel contg. ≤0.015% C, ≤0.5% Si, 0.10W0.35% Mn, ≤0.03% P, ≤0.01% S, 0.5W5% Cr, 0.01W0.08% Al, ≤0.0060% N, and the balance consisting of iron and unavoidable impurities is hot rolld and is coiled at about ≤650°C. After this is descaled, it is cold rolled at 40W75% drafts percent. Such cold rolled steel plate is slit to narrow widths, for example, about 10W30mm, and is annealed at ≥707°C and ≤Ar3 transformation point in a gaseous atmosphere contg. ≥30% H2.

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Inventors:

IWAMOTO TSUTOMU
MATSUDA MASAYUKI
YOSHIHARA TAKANOBU

Application Number:

JP9810181A

Publication Date:

January 06, 1983

Filing Date:

June 24, 1981

Export Citation:

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Assignee:

NIPPON STEEL CORP

International Classes:

C22C38/00; C21D8/02; C21D9/46; C22C38/18; F28F21/08; (IPC1-7): C21D8/02; C21D9/46; C22C38/18

Attorney, Agent or Firm:

Teruo Taniyama

Next Patent: AMORPHOUS MAGNETIC ALLOY HAVING CITRIC ACID RESISTANCE