STEEL SHEET FOR PIPE HAVING LOW DEVIATION OF MECHANICAL PROPERTY METHOD FOR MANUFACTURING THE SAME AND METHOD FOR MANUFACTURING WELDED STEEL PIPE USING THE SAME

摘要

TECHNICAL FIELD The present invention relates to a steel material for pipes used for mining oil and gas, and more particularly, to a steel material for pipes having a small material variation, a method for manufacturing the same, and a method for manufacturing a welded steel pipe using the steel material for pipes will be.