发布时间:2025-01-16 21:11:08
钢筋HPB300,335,400分别代表:
HPB300,也是热轧光圆钢筋,一级钢,比HPB235的屈服强度更高。是最新的国家对一级钢材质的标准,用来取代现在较旧的HPB235材质的一级钢。
HRB335,热轧带肋钢筋,也就是二级钢。
HRB400,热轧带肋钢筋,也就是三级钢。
HP表示:钢筋混凝土用热光圆钢筋,HR表示:钢筋混凝土用热轧带肋钢筋。如图所示:
请各位专家和古玩朋友帮鉴定一下这个大明宣德年制香炉的真伪谢谢
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