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.

　　圆钢和螺纹钢的区别如下：

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

　　1、  外形不同，圆钢的外表是光滑的；螺纹钢的外表是带有螺旋形的横肋。

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

　　2、生产标准不同。在现行标准中，圆钢指的是HPB300级钢筋，它的生产标准是《钢筋混凝土用热轧光面钢筋》；而螺纹钢一般指的是HRB400E、HRB500级钢筋，它的生产标准是《钢筋混凝土用热轧带肋钢筋》。

　　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、强度不同。圆钢的设计强度是270Mpa；螺纹钢的设计强度较圆钢的高一些，HRB400E的设计强度为360Mpa；HRB500的设计强度为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、钢种不同，这里讲的是化学成分不同。圆钢属于碳素钢，钢种是HPB300；螺纹钢属于低合金钢，分为HRB400E螺纹钢和HRB500螺纹钢。

　　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。圆钢的冷弯性能较好，可以作180°的弯钩，而螺纹钢只能作90°的直钩；圆钢的可焊性较好，用普通碳素焊条即可，而螺纹钢则需用低合金焊条；螺纹钢在韧性、抗疲劳性能方面较圆钢好。

　　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.

　　以上五点是为主要的圆钢和螺纹钢的区别，条理清晰，大家应该也都能够看清楚。当然还有一点不同，那就是，如果您需要济南钢筋批发可以点击我们的官网进行咨询：http://www.jzqgc.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.jzqgc.com./