A3板原来叫普通碳素钢,屈服强度为235MPa,在这一类钢中位列第三,所以叫A3，A3钢是旧标准中的3号钢，属按物理性能划分的普通碳素钢。

A3 plate was originally called ordinary carbon steel with a yield strength of 235MPa, ranking third among this kind of steel, so it is called A3. A3 steel is no. 3 steel in the old standard, which is ordinary carbon steel according by physical properties.

Q235普通碳素结构钢－普板是一种钢材的材质。Q代表的是这种材质的屈服极限，后面的235，就是指这种材质的屈服值，在235MPa左右。并会随着材质的厚度的增加而使其屈服值减小。由于含碳适中，综合性能较好，强度、塑性和焊接等性能得到较好配合。

Q235 ordinary carbon structural steel-general board is a kind of steel material.Q represents the yield limit of this material, and the following 235 refers to the yield value of this material, which is around 235MPa.And it makes the yield value of the material decrease as its thickness increases.Due to the moderate carbon content, the comprehensive performance is good, and the strength, plasticity and welding performance is better matched.

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