In construction engineering, round steel and thread steel are popular terms for different types of steel bar, but for new entrants, it is one of the most easily confused typical problems. Today let's sort out the difference between round steel and thread steel.

　　圓鋼和螺紋鋼的區別如下：

　　The difference between round steel and threaded steel is as follows:

　　1、  外形不同，圓鋼的外表是光滑的；螺紋鋼的外表是帶有螺旋形的橫肋。

　　1. The appearance of round steel is smooth with different shapes; the appearance of threaded steel is a cross rib with spiral shape.

　　2、生產標準不同。在現行標準中，圓鋼指的是HPB300級鋼筋，它的生產標準是《鋼筋混凝土用熱軋光面鋼筋》；而螺紋鋼一般指的是HRB400E、HRB500級鋼筋，它的生產標準是《鋼筋混凝土用熱軋帶肋鋼筋》。

　　2. Different production standards. In the current standard, round steel refers to HPB300 steel bar, its production standard is "Hot Rolled Smooth Steel Bar for Reinforced Concrete"; while screw steel generally refers to HRB400E, HRB500 steel bar, its production standard is "Hot Rolled Ribbed Steel Bar for Reinforced Concrete".

　　3、強度不同。圓鋼的設計強度是270Mpa；螺紋鋼的設計強度較圓鋼的高一些，HRB400E的設計強度為360Mpa；HRB500的設計強度為435Mpa。

　　3. Different strength. The design strength of round steel is 270 Mpa; the design strength of threaded steel is higher than that of round steel, the design strength of HRB400E is 360 Mpa; the design strength of HRB500 is 435 Mpa.

　　4、鋼種不同，這里講的是化學成分不同。圓鋼屬于碳素鋼，鋼種是HPB300；螺紋鋼屬于低合金鋼，分為HRB400E螺紋鋼和HRB500螺紋鋼。

　　4. Different kinds of steel, here we talk about different chemical composition. Round steel belongs to carbon steel, steel grade is HPB300; threaded steel belongs to low alloy steel, which is divided into HRB400E threaded steel and HRB500 threaded steel.

　　5、物理性能不同。圓鋼的冷彎性能較好，可以作180°的彎鉤，而螺紋鋼只能作90°的直鉤；圓鋼的可焊性較好，用普通碳素焊條即可，而螺紋鋼則需用低合金焊條；螺紋鋼在韌性、抗疲勞性能方面較圓鋼好。

　　5. Different physical properties. The cold bending performance of round steel is better, it can be used as 180 degree bending hook, while the threaded steel can only be used as 90 degree straight hook; the weldability of round steel is better, using ordinary carbon welding rod, while the threaded steel needs low alloy welding rod; the toughness and fatigue resistance of threaded steel is better than that of round steel.

　　以上五點是為主要的圓鋼和螺紋鋼的區別，條理清晰，大家應該也都能夠看清楚。當然還有一點不同，那就是，如果您需要濟南鋼筋批發可以點擊我們的官網進行咨詢：http://www.xamas-international.com/

　　The above five points are the main differences between round steel and threaded steel. They are clearly organized, and you should be able to see them clearly. Of course, another difference is the price. If you need Jinan reinforcing steel wholesale, you can click on our official website to consult: http://www.xamas-international.com./