HEAT-RESISTANT STEEL TUBE FOR CHEMICAL REACTION

Japanese Patent JPH01111849

A

PURPOSE:To manufacture a heat-resistant steel tube for chemical reaction excellent in workability and strength at high temp. by incorporating specific percentages of C, Si, Mn, Ni, Cr, Al, and B and also incorporating Zr and Nb in the amounts satisfying specific inequalities to iron. CONSTITUTION:A heat-resisting steel having a composition which consists of primary components consisting of, by weight, 0.1-0.45% C, >=1.0% Si, >=2.0% Mn, 20-45% Ni, 20-30% Cr, 0.03-0.09% Al, and 0.001-0.01% B, secondary components consisting of Zr and Nb in the amounts satisfying respective inequalities of 1.2C(%)+0.2<=Zr(%)+Nb(%)<=1.2C(%)+1.2 and Zr(%)-0.4<=Nb(%)<=Zr(%)+0.2, and the balance iron with inevitable impurities is prepared. By this method, the heat-resisting steel for high-temp. reaction tube in chemical plants having superior workability and strength at high temp. can be obtained.

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MATSUDA SADAMU
OI SHIGEHIRO
ISHIOKA HIROYUKI
FUJIOKA JUNZO
NISHIO KOJI

JP26792687A

April 28, 1989

October 22, 1987

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SANYO SPECIAL STEEL CO LTD
KAWASAKI HEAVY IND LTD

C22C38/00; C22C38/54; (IPC1-7): C22C38/00; C22C38/54

JPS5196720A	1976-08-25
JPS62214149A	1987-09-19
JPS6289854A	1987-04-24
JPS6289840A	1987-04-24
JPS49117318A	1974-11-09
JPS63247341A	1988-10-14

Satoshi Shimizu (2 outside)

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