Twelve Questions about High-ductility Cold Rolled Ribbed Bars
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Hot-rolled discs have been cold-rolled and tempered to obtain cold-rolled ribbed bars with higher ductility, and are called high-ductility cold-rolled ribbed bars, which are upgrades of cold-rolled ribbed bars.
Second, why the name "high ductility cold rolled ribbed steel"?
It mainly considers the harmonization and consistency of this standard with similar standards and is user-friendly. At the same time, it can highlight the product's high ductility quality characteristics and scientifically and rationally reflect the main target of the standard, taking into account that the main feature of this product is high ductility. Therefore, the name of this standard is defined as: "high-ductility cold-rolled ribbed rebar."
Third, the name "high ductility" What is the significance?
"High ductility" is a modifier for cold-rolled ribbed steel bars. It mainly refers to cold-rolled ribbed bars with high elongation. This is determined by the two industry standards preparation teams. Can help the application of cold-rolled ribbed steel and construction steel savings, and promote the replacement of cold-rolled ribbed steel.
Fourth, the product characteristics of high ductility cold-rolled ribbed steel using high-ductility cold rolled ribbed steel produced by new equipment, new technology, to overcome the original cold-rolled ribbed steel product quality instability, product quality has improved significantly . In the premise of improving the tensile strength and the flexing ratio of the product, the elongation rate of the steel bar is also greatly increased. The high ductility cold-rolled ribbed steel bar has the advantages of high strength, good extension performance, accurate product appearance dimensions, good rust prevention performance, good anchorage performance with concrete, and easy processing.
Fifth, the application of high-ductility cold rolled ribbed steel?
High-ductility cold-rolled ribbed steel bars are upgraded products of cold-rolled ribbed steel bars, and provide new ways for cold-rolled ribbed steel bars to be used in a wider range of fields such as high-speed rail construction, expressways, and high-rise buildings. Therefore, the products specified in this standard are applicable to higher ductile cold-rolled ribbed steel bars for reinforced concrete and prestressed concrete, and also to higher-ductility cold-rolled ribbed steel bars for welding nets.
What is the grade of high ductile cold rolled ribbed steel?
The steel grade consists of the tensile strength characteristics of CRB and steel bars and H. C, R, and B are the English first letters of Cold-rolled, Ribbed, and Bar, respectively, and H is an abbreviation for High Endurance. Its brands are CRB600H, CRB650H, CRB800H.
VII. Why is the standard single-stranded cold-rolled ribbed steel grade?
The main reason is that through the accumulation of experience in actual production over the past few years, the high ductile cold-rolled ribbed steel bar products produced using the new process have not only a significant increase in the elongation rate of the steel bars, but also a sufficient guarantee of the strength of the steel bars. The increase in yield strength of steel bars can increase the strength of building design and save steel materials. The purpose is to increase the potential of cold-rolled ribbed steel bars and highlight the advantages of high-efficiency steel bars.
Eight, the appearance of high ductile cold rolled ribbed steel?
The surface of the steel bar is provided with two lateral ribs and four lateral ribs distributed uniformly along the length direction. The four-sided cross-rib product Anyang Heli Co., Ltd. has been trial-produced successfully, and Europe has national production and application standards. When the four-sided transverse rib steel bar is used for the production of welding nets, it has the characteristics of convenient fabrics and firm solder joints. For future development considerations, the related contents of four-sided rib bars are incorporated into the standard in accordance with DIN488 standards.
Nine, the high ductile cold rolled ribbed steel size?
The nominal diameter of two-sided ribs ranges from 5mm to 12mm. The nominal diameter of three-sided ribs ranges from 6mm to 12mm.
10. What is the significance of high ductile cold-rolled ribbed steel bars compared to the original standard?
The yield strength of high ductile cold-rolled ribbed bars increased from 500 MPa to 520 MPa, the tensile strength increased from 550 MPa to 600 MPa, and the strong flexion ratio increased from 1.03 to 1.05. It is mainly to develop the potential of cold-rolled ribbed steel bar products and highlight the advantages of high-efficiency and energy-saving steel bars.
Eleven, why is the elongation of the steel bars important?
The breakage of steel bars leads to the disintegration of components and the collapse of structures. This is the greatest threat to safety. Therefore, the elongation has a very important influence on the safety of the structure and its importance is no less than its strength.
12. Why did the new standard increase the maximum force total elongation index?
In order to reflect the high ductility of this product, compared with GB13788, the elongation has been greatly improved. For the maximum force total elongation index, the theory in recent years believes that the traditional fracture elongation only reflects the residual elongation of the neck region, not the true sign of the deformability of the steel, and only the maximum force achieved before the breakage of the steel bar The total elongation Agt is the true sign of ductility, so this standard adds relevant provisions for the Agt index. The standard stipulates that the AGT index of CRB600H is 5.0%, and the original cold-rolled ribbed steel bars are 2.0%, an increase of 1.5 times.