| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide coiled tubing with elevated tensile properties.SOLUTION: A coiled steel tube comprises: a composition containing iron, 0.17-0.35 wt.% of carbon, 0.30-2.00 wt.% of manganese, 0.10-0.30 wt.% of silicon, 0.010-0.040 wt.% of aluminum, up to 0.010 wt.% of sulfur, and up to 0.015 wt.% of phosphorus; and a final microstructure containing a mixture of tempered martensite and bainite.</p> |
