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铬钼钢是制造高温高压容器的典型钢种之一。在高温高压条件下长期操作的铬钼钢,会回火脆化和缺口韧性下降。回火脆化是材料在375～575℃范围内出现的一种现象,而该温度范围正是炼厂容器操作的温度区域。因此,为操作安全起见,最近对焊接材料的抗回火脆化能力和低温韧性的要求,也越来越高了。此外,为了提高炼厂设备的可靠性,以及对煤液化设备的考虑,现在正在寻求高温高压下有更高强度的材料。对这类高强度的材料,也同样要求有优良的低温韧性。
Chromium-molybdenum steel is one of the typical steel grades used to make high temperature and pressure vessels. Chromium-molybdenum steel, which is operated for a long time under high temperature and high pressure, will temper embrittlement and reduce the notch toughness. Temper embrittlement is a phenomenon that occurs in the range of 375-575 ° C, which is the temperature range at which the refinery operates. Therefore, for the sake of operational safety, the requirements of the anti-temper embrittlement ability and the low-temperature toughness of the welding materials are also higher and higher recently. In addition, in order to improve the reliability of refinery equipment, as well as the consideration of coal liquefaction equipment, high-temperature and high-pressure materials are now being sought. For such high-strength materials, also require excellent low temperature toughness.