... 具有屈服现象的金属材料，试样在拉伸过程中力不增加（保持恒定）仍能继续伸长时的应力，称屈服点。若力发生下降时，则应区分上、下屈服点。屈服点的单位为N/mm2（MPa）。 上屈服点（σsu）： 下屈服点（σsl）： ...
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业已观察到下屈服点比上屈服点易产生更大的散布度。
It was observed that the lower yield point was subject to a greater degree of scatter than that of the upper yield point.
屈服点是在应变有可观增加，应力没有增加的应力极限，在这个极限下，如果应变继续增加，应力就也会增加。
The yield point is the stress at which there is an appreciable increase in strain with no increase in stress, with the limitation that, if straining is continued, the stress will again increase.
气体压力试验时的应力值，不得超过试验温度下材料屈服点的80%。
The value of stress under air pressure test shall not exceed 80% of the yield point of the material in test temperature;
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