Terminology of cold-rolled ribbed bar with symbol of cold-rolled ribbed bar

Cold-rolled ribbed steel bars are now widely used in the construction industry, mainly in precast cast-in-place concrete structures, which are characterized by saving steel, formerly known as cold-drawn low-carbon steel wires. It is two or three crescent-shaped steel bars formed by hot-rolled wire rods after hot rolling and lightweight. As early as the 1960s and 1970s, Britain, Germany, Austria, Italy and the United States had already developed and mass-produced products, which were widely used in various fields. However, China was only introduced in the 1980s and did not have its own production line until 2008. With the increase of its output, a series of international standards have been formulated, some of which are symbolic terms, so I want to take you to Bianxiao for a look.

A symbol, cold-rolled ribbed steel bar

What brand is the cold-rolled ribbed steel bar stipulated by the national standard? CRB550？ CRB650？ CRB800？ CRB970？ The delivery method of cold-rolled ribbed steel bars is usually coil delivery, and CRB550 can be perpendicular.

Second, the brand of cold-rolled ribbed steel bar

The brand of steel bar consists of CRB, the characteristic value of tensile strength of steel bar and the letter H representing high ductility. C, R and B are the initials of the words cold-rolled, ribbed and bar respectively. The brands of ribbed steel bars are CRB550, CRB600H, CRB650H and CRB800H.

CRB550 is the brand of common cold-rolled ribbed steel bars. When used to calculate the shear, torsion and punching bearing capacity, its strength design value should not be greater than 360N/mm2.

CRB600H？ It is a brand of high ductility cold-rolled ribbed steel bar.

Three, cold-rolled ribbed bar terminology (from the network)

(1) cold rolled cold rolled ribbed steel bar? Rib? Steel? Hot-rolled wire rod is cold-rolled and reduced in diameter, and then cold-rolled on its surface into three or two transverse ribs evenly distributed along the length direction.

② Nominal diameter? The diameter of a circle with a diameter equal to the nominal cross-sectional area of the reinforcement.

(3) welding steel welded mesh? Steel? The fabric has longitudinal and transverse steel bars with the same or different diameters, which are arranged vertically at certain intervals, and all the intersections are welded together by resistance spot welding.

④ Cold-rolled ribbed reinforced concrete structural concrete? Structure? With what? Cold rolled? Rib? Steel? Steel wire is a structure made of cold-rolled ribbed reinforced concrete under stress.

The symbols, brands and technical terms of some cold-rolled ribbed bars have been introduced above. The function of symbols not only omits many unnecessary descriptions for our daily work, but also improves the professionalism of articles in the industry. In addition, symbols, brands and technical terms are conducive to standardizing and unifying the standards of cold-rolled ribbed steel bars, and to quality supervision and so on. But to a certain extent, it also increases the difficulty for laymen to interpret industry information and some words, which is also a shortcoming of terms and symbols. But in a word, the development of symbols and terms is a proof of product standardization.