Q235-A\B\C\D 原材料钢材 如何区分这4个质量等级？

Question

如题：Q235原材料钢材 如何区分A\B\C\D这4个质量等级？
我们知道化学成分方面：
C Si Mn P S
A级：0.22 0.35 1.40 0.045 0.050 c*W k9x4R c X'G
B级：0.20 0.35 1.40 0.045 0.045 G A;[ N,n ?
C级：0.17 0.35 1.40 0.040 0.0405j g¬h Oj a D'G&S L
D级：0.17 0.35 1.40 0.035 0.035
力学性能方面：A级不要求冲击；B级做20度冲击；C级做0度冲击；D级做-20度冲击，冲击吸收功均不小于27J。

但是如果原材料没有标明是哪种等级，我们如何将其区分出来？
请教高手：有什么检测仪可以通过检测，直接判断出ABCD等级？
（本人想法：通过碳硫测仪，检测其C和S的含量，然后从4个等级的C、S含量标准对照找出它是哪个等级。这个方法应该可行，但不直观，费时！）

Answer 1

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Answer 2

做低温冲击实验，比较冲击功，不行么？
我可以给你做实验呀