20 Q345の2種類の材料の選定には、どのような規定や違いがありますか？
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20 Q345の2種類の材料の選定には、どのような規定や違いがありますか？{:3_50:} 受け入れ材はいつ20を選び、いつQ345Rを選ぶか。
機械的性質や化学組成はそれぞれ異なり、配管にはQ345はあまり使われず、機器にはよく使われます
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