CRB550 Cold rolled ribbed bars,steel rebar

          Specifications:   Common sizes: φ4.0mm-φ12mm. Cold rolled ribbed steel bar is a new model practical construction steel materials. It is widely used as the fitting bar for various steel bar concrete structure engineering and making of various construction components. With its high strength and the fixing strength with concrete, its sufficient plastic property, it can enhance the technical and the quality of the engineering, reduce the cost of raw materials and the cost of engineering at the same time. The finished products can be round coil or straight sizes.          1.Rolling kinds of type finished products ,can do according following

Outlet diameter(mm)	Intensity level (MPa)	Raw material diameter(mm)	Steel raw materials(mm)	The first rolling diameter(mm)	The second diameter(mm)	Total deformation(Area rate)%
11	550	13	Q235J	12.3	11	28.4
10	550	11.5	Q235J	11.3	10	24.4
9	550	10.5	Q235J	10.2	9	26.5
8	550	9.3	Q235J	9	8	26
7	550	8	Q235J	7.8	7	23.4
6	550	7	Q235J	6.8	6	26.5
6	650	7	Q235J	6.8	6	26.5
5	650	6.5	Q235J	5.5	5	40.8
5	650	6.5	Q235J	5.5	5	40.8
4	650	5.3	Q235J	4.5	4	43

  2.According to the specific circumstances of raw materials, process parameters can be used as alternative:

Steel Wire rod diameter(mm)	Rolling Specifications(mm)	The first rolling sizing (mm)	The second rolling size(mm)	Host speed(m/min)	Compound pulley dimensions:Host/straightening machine(mm)
6.5	5	0.6~0.8	5±0.2	110	200/155
8	6	1~2	6±0.2	110	200/155
8	7	0.1~0.2	7±0.2	110	200/155
10	8	1~1.2	8±0.2	90	258/200
10	9	0.1~1.2	9±0.2	90	258/300
12	10	1~1.2	10±0.2	60	380/300
12	11	0.1~0.2	11±0.2	90	258/200

      

Dynam Capability and Technic Capability

Grade	MPa≥	(Tensility)≥		(Bend Test)180	Bend Time
		δ10	δ100
CRB550	550	8.0	-	D=3d	-

 

Wire Rod Size and Chemical Composition for Cold Rolled Ribbed Steel Bar

Steel Bar Grade	Wire Rod Grade	Chemical Composition
		C	Si	Mn	v/Ti	S	P
CRB550	Q215	0.09~0.15	≤0.03	0.25~.055	-	≤0.050	≤0.045

                                                  

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