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DEEP DRAWABLE STEEL FOR MANUFACTURING PRESSURE VESSEL USED AT LOW TEMPERATURE HAVING 1200MPA GRADE TENSILE STRENGTH, PRODUCING METHOD OF SAID STEEL AND PRODUCING METHOD OF SAID PRESSURE VESSEL
DEEP DRAWABLE STEEL FOR MANUFACTURING PRESSURE VESSEL USED AT LOW TEMPERATURE HAVING 1200MPA GRADE TENSILE STRENGTH, PRODUCING METHOD OF SAID STEEL AND PRODUCING METHOD OF SAID PRESSURE VESSEL
The present invention is a thick steel plate for producing a low-temperature and high-pressure container of a tensile strength 1200MPa class used for deep drawing, mainly used for low-temperature and high-pressure pressure vessels, CNG storage containers for automobiles, the method of manufacturing the thick steel plate and the thick steel plate It relates to a method for producing a low temperature, high pressure vessel from the.;The steel for deep drawing of the present invention for achieving the above object, C: 0.25-0.38 weight%, Si: 0.15-0.40 weight%, Mn: 0.4-1.0 weight%, Al: 0.001-0.05 weight%, Cr: 0.8 ~ 1.2% by weight, Mo: 0.15-0.35% by weight, Ni: 1.0% by weight or less, P: 0.015% by weight or less, S: 0.015% by weight or less, Ca: 0.0005-0.002% by weight, B: 0.0005-0.0025% by weight, It consists of the balance Fe and other unavoidable impurities, and comprises a three-phase composite structure of ferrite + pearlite + bainite.;In the case of the present invention, the low-temperature and high-pressure container produced by deep drawing can be produced at a higher strength than before without deteriorating weldability or toughness.;Deep drawing, spheroidization, complex structure, high pressure vessel, quenching and reflection treatment
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