- Standard: ASTM, BS, DIN, GB, JIS
- Grade: CRB550
- Diameter: 4~12MM
- Length: Any length or coil
- Place of Origin: Tianjin, China (Mainland)
- Brand Name: SJT
- Model Number: 4~12mm
- Application: building construction
- Yield strength: 500Mpa
- Tensile strength: 550Mpa
- Agt: 8%
Packaging & Delivery
|Packaging Details:||standard package for exporting.|
Cold rolled ribbed steel wires and bars
Cold rolled ribbed steel bar is made of hot rolled wire rod by multichanel cold-rolled,reducing a rib rolling and after stress relief form of a steel bar with two or three surface crescent. Cold rolled ribbed steel bar is the upgrading production of cold drawn low carbon steel wire in prestressed concret members. In cast-in-situ concrete structure,steel can be instead of I grade steel bar, in order to save steel, is better one in the same kind of cold rolled steel.
Cold rolled ribbed steel grades by the CRB and reinforced the tensile strength of the minium.C,R,B,respectively (cold-rolled),cold-rolled ribbed(ribbed),steel bar(bars) three words of the first letter in English.
1. Standard: GB 13788-2008
2. Dia.: 3~12mm
3. Length: any length or coils
4. Coils weight: about 100kgs
5. Technology: cold-working
6. Yield strength: 500Mpa
7. Tensile strength: 550Mpa
8. Raw material: hot rolled wire rod
9. Outside apperance: two sides ribbed or three sides ribbed
Steel bar grade anc chemical composition
Wire rod size and chemical composition for cold rolled ribbed steel bar
|Steel bar grade||Wire rod grade||Chemical composition(qualityscore)/%|
Two sides ribbed apperance and shape of cross section:
Three sides ribbed apperance and shape of cross section:
Dynam capability and Technic capability for cold rolled ribbed steel bar
Bend test 180degree
|Bend TIme||The stress relaxation initial value should be equivalent to 70% of the engineering tensile strength|
The size,quality and allowable devision for steel bar of two ribs and rib on three sides
Advantages for cold rolled steel bar
1.High tensile strength steel, it can same material and reduce the project cost. CRB550 compared with hot rolled round steel bar, used for cast-in-place structure (especially the floor roof) can save 35%-40% steel. Such as considering no hook,steel more savings.
2.Cold rolled ribbed steel bar the bond anchorage between reinforcment and concrete performance is good. Used in components, therefore, fundamentally eliminate the anchorage zone of cracking,steel wire slip and failure phenomenon, and improves the end bearing capacity and crack resistance of the component; In reinforced concrete structure, the crack width is better than round bar ,even smaller than hot rolled thread bar.
3.Elongation than the same kind of cold rolled ribbed bar.