High grade hot rolled bar

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Reinforcing bar (Rebar) refers to the use of reinforced concrete and prestressed concrete with steel, its cross section is round, sometimes for the square with rounded corners. Including light round bar, ribbed steel bar, torsion bar. Reinforced concrete with steel bar is refers to the reinforced concrete reinforcement with straight or plate of strip steel, its appearance is divided into two kinds, light round steel and deformed steel delivery status for the straight bar and wire rod in two. Light round bar is really a small round steel and ordinary low carbon steel wire rod. Deformation is surface ribbed steel bar, usually with 2 longitudinal and cross rib of uniform distribution along the length direction. The appearance of cross rib is spiral, chevron, crescent 3 kinds. With nominal diameter mm number representation. Equals the nominal diameter is equal to the cross section deformation of reinforced light round bar nominal diameter. Reinforcement of nominal diameter is 8-50 mm, recommends to the diameter of 8, 12, 16, 20, 25, 32 and 40 mm. Steel grade: 20 mnsi, 20 mnsi MNV, 25, BS20MnSi. Rebar in concrete main tensile stress. Deformed bars as a result of the action of rib, and concrete have larger bonding ability, thus better able to withstand the role of external force. Steel is widely used in various building structures. Especially large, heavy, light thin wall and high-rise building structure.


Steel processing, steel processing to table and design review, check the material list for errors and omissions, for each steel bar to press

Material list to check whether meet the requirements, after these two checks, then press the material list sent out samples, trial production of qualified rear can batch production, processing and good reinforcement to neatly stacked in order.

Construction such as the need to be reinforced by substitution, must fully understand the design intent and substitution material performance, strictly abide by the current design code of reinforced concrete rules, not to area such as the substitution of low strength of high strength steel reinforcement. Any important parts of a reinforced substitution, shall agree with the consent of party a, design unit, and have a written notice shall be substitution.


(1) the steel surface should be clean, sticky oil, dirt, rust must be cleaned before use, can be combined with cold-drawn rust removal process.

(2) reinforced straightening, usable mechanical or manual straightening. After straightening of steel can not have local small bending, die bending, wavy, its surface scars should not be made of steel decreases by 5%.

(3) the steel bar cutting should be according to the number, diameter, length and quantity, the length is tie-in, first cutting long expected, by cutting short expected to reduce short head, and shorten the steel to save steel.

(4) steel hook or bend:

1) steel hook. There are three kinds of forms, respectively semicircle hook, hook and hook. After bending, bend endothelial contraction, skin

Extension, axis length is constant, bend arc formation, size is greater than the baiting size after bending, bending modifier should be considered.

Reinforced bending diameter of 2.5 d heart, straight part for 3 d. Steel hook increase the length of the theoretical calculation value: counter rotating round hook is 6.25 d, the straight

Hook is 3.5 d, the hook is 4.9 d.

(2) the bending of steel. Middle bending diameter D bend, not less than five times the diameter of the reinforcing steel bar.

(3) the stirrup. Stirrups should be done at the end of the hook, hook form should meet the design requirements. Stirrup adjustment, is the hook to increase the length and bending adjustment

Value or the difference between the two and, according to the amount of stirrup outsourcing size or inside the package size.

(4) reinforced blanking length should be according to the component size, concrete cover thickness, rebar bend modifier and hook to increase the length of the provisions as comprehensive exam

Lv.

A. straight reinforced blanking length = member length - protective layer thickness increase length + hook,

B. turn up steel blanking length = straight length - bend modifier + + inclined curved length increase length of hook,

C. blanking length = stirrup stirrup inner perimeter + modifier + hook to increase length of stirrup.



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Q:What is the difference between three - grade steel and two - grade steel?
Three grade thread steel HRB400, two grade thread steel HRB335, now the thread steel is inside the building must be less, then three grade screw steel and two grade thread steel is mainly used for what aspect, in order to solve this problem.
Q:High strength thread steel hrb400e 32 in diameter, is it special steel?
Hrb400e diameter 32 of the rebar is not special steel, it is seismic steel.
Q:Which is more expensive, rebar or round steel? Which is your business opportunity, such as thread steel and round bar?
The two thread steel and round steel, which will be more expensive, steel and round steel prices now are soaring, steel prices per ton in 4300 yuan / ton, quality steel grade three Beijing qianshengcheng price is in 3950-4200 yuan / ton.
Q:What is the carbon content of thread steel?
It is understood that carbon is the main element determining the performance of steel, because changes in carbon content directly lead to changes in crystal structure. With the increase of carbon content, the strength and hardness of the threaded steel increase, while the plasticity and toughness decrease. When the carbon content is more than 1%, the strength of the rebar decreases. The increase of carbon content also reduces the weldability and corrosion resistance of steel, and increases the cold brittleness and aging tendency of steel.
Q:What is the difference between three - grade steel and other grades?
1, different grades of steel (chemical composition is different). HRB335 grade steel is 20MnSi (20 manganese silicon); HRB400 grade steel bars are 20MnSiV or 20MnSiNb or 20MnTi etc.;2, strength is different, HRB335 grade steel tensile and compressive design strength is 300MPa, HRB400 grade steel tensile and compressive design strength is 360MPa.
Q:Thread steel 20*9 one is 2.001T. How many pieces of this one?
The weight of the thread steel = diameter * diameter *0.00617=20*20*0.00617=22KG, and then the total quality of this piece in the weight of a single thread steel, you can clearly get the number of roots.
Q:Now, the two project is to use rebar or rebar?
Of course, depends on what steel is used for components, such as the two structure of the structure column, and other minor parts, it does not matter.
Q:Difference between round bar and threaded steel in use
Because steel for low alloy steel, its price is higher than that of low carbon steel, or construction units, design units, often on the general civil construction of the "practical" point of view, reduce the quality of the project, and the use of low carbon steel instead of rebar. For large engineering projects, often bribed "project inspector after" to replace "Choulianghuanzhu rib steel bar, reduce the construction cost.
Q:Why is the earthing device forbidden to use thread steel instead of round steel as lap steel bar?
The mechanical strength of the steel thread is destroyed. Because the supporting point is only the ground, it is easy to cut the steel directly if the thread is not vertical. Therefore, we need to use angle iron, steel pipe or smooth steel round bar.
Q:Can the end of the steel bar be inserted by the steel bar?
Chemical method of planting steel refers to the concrete, walls, rock and other materials on the drilling, and then injected into high-strength steel planting glue (Note: high-strength construction bar planting glue is roughly divided into injection type planting glue and barrel type steel planting glue two). Then insert the steel bar or section bar, glue and solidify the steel bar and the base material bond as an integral whole, it is a kind of construction technology that is more commonly used in reinforcing and reinforcing industry.

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