Ⅰ级钢筋没有螺纹钢。在GB13013-91《钢筋混凝土用热轧光圆钢筋》中的术语表达得很明碓:热轧直条光圆钢筋级别为Ⅰ级,强度等级代号为235。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/21a4462309f79052cc8dacd007f3d7ca7acbd54a?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
然而在《钢筋混凝土用钢第1部分:热轧光圆钢筋》GB 1499.1-2008 的前言:修改并统一钢筋牌号。在术语和定义的分级、牌号中表1予以明确(从这里可以得出:级别:Ⅰ级的称谓退出历史舞台),随着设计对钢筋要求的提高,HPB235也淘汰,到今(答题)热轧光圆钢筋只剩下HPB300了。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/9c16fdfaaf51f3de100a6e8a9feef01f3b2979a0?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/a1ec08fa513d26971a87d9b35efbb2fb4216d88c?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
参考资料:《钢筋混凝土用热轧光圆钢筋》GB13013-91、《钢筋混凝土用钢第1部分:热轧光圆钢筋》GB 1499.1-2008