| 摘要 |
<p>Disclosed is a method for making seamless tubing in a quality range of X 52 to X 90, with a stable elastic limit up to a temperature of application of 2000 C and with a steady tension-expansion characteristic, consisting in submitting to a hot rolling process a steel-based source material containing the following alloy components (wt. %): C(0,06 - 0,18 %), Si (max. 0,40 %), Mn (0,80 -1,40 %), P (max. 0,025 %), S (max. 0,010 %), Al (0,010 - 0,060 %), Mo (max. 0,50 %), V (max. 0,10 %), Nb max. 0,10 %, N (max. 0,015 %), W > 0,30 - 1 %), the rest consisting of Fe and the usual impurities. After the hot rolling process, the cooled tubing parts are reheated through AC¿3?, then tempered at a cooling temperature of at least 15 °C/s, and annealed at a temperature of 500 to 700 °C.</p> |
