求翻译：从表中列出的许用应力值，可以看到T911和 T91钢虽然在566-620℃温度范围内相差不大；但是，当设计金属温度为593℃时使用P911比P91钢要高10％左右，所以，在该温度及以下，用P911钢设计的集箱和主蒸汽管道的壁厚可以减小是什么意思？

From the table lists the allowable stress values, you can see the t911 and t91 steel at 566-620 ° C temperature range or less; However, when the design metal temperature of 593 ° C, p911 than p91 steel is higher 10% Therefore, the temperature and below, p911 steel header and main steam pipe wall thi

Listed in the table from the stress of the license, and you can see Values T T 911 and 91 566 - stainless steel while the temperature range 620 °C in; however, is not much difference between the design metal temperature is to use 593 ° C P P than 911 91 to 10 percent, so, in the temperature and the

Allowable stress value lists which from the table, may see T911 and the T91 steel although differs not not in a big way in 566-620℃ the temperature range; But, when design metal temperature for 593℃ uses P911 to want about high 10% compared to the P91 steel, therefore, in this temperature and below,

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