| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel pipe which is hard to generate local buckling to compressive stress which acts in the axial direction at the time of a great earthquake, especially suitable to a gas pipe line, water piping, pillars for buildings and structure or the like and excellent in resistance to earthquake and its manufacturing method. SOLUTION: This steel pipe excellent in the resistance to earthquake has a steel composition consisting of, by weight, 0.03-0.15% C. 1.0-2.0% Mn and 0.10-0.25% PCM, further, >=1 kind which is selected fronm the group of 0.05-0.50% Cu, 0.05-0.50% Ni, 0.05-0.50% Cr, 0.05-0.50% Mo. 0.005-0.10% Nb, 0. 005-0.10% V and 0.005-0.080% Ti and the balance of Fe with inevitable impurities, and the resistance to earthquake is excellent as the work-hardening expornent fronm yield strength in the axial direction of a pipe to 5% in the nominal strain of >=0.10. Where, PCM=C%+Si%/30+Mn%/20+Cu%/20+Ni%/60+Cr%/20+Mo%/15+V%/10+5×B%.
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