关于ASME材料问题

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ASME Ⅱ中SA-515中高温压力容器用钢板，SA-516中低温压力容器用钢板。二者的分界线是什么，如何区分。

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两者之间应该不存在分界线，高温和低温中间还有常温相分隔。

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SA-515/SA-515M    coarse austenitic grain size
SA-516/SA-516M    fine austenitic grain size

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PROHIBITION ON MULTIPLE
MARKING
Dual or multiple marking is not acceptable if two or
more specifications to which the material is marked have
mutually exclusive requirements.
This prohibition includes more than just chemistry and
property requirements. Examples are SA-515 and SA-516;
the former requires melting to coarse grain practice while
the latter requires melting to fine grain practice. Another
example is SA-213 TP304L and TP304H; the carbon content
ranges of these grades have no overlap.

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实际生产过程中，SA515是粗晶粒钢，SA516是细晶粒钢