Hot rolled ribbed steel bars (HRB400E~500)

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Tianjin
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TT OR LC
Min Order Qty:
1000 m.t.
Supply Capability:
20000 m.t./month

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Product Description:

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:Why the longitudinal tie bar adopts screw steel bar, and the transverse transmission bar adopts light round steel bar.
Fine grain hot-rolled steel grades in the hot rolled ribbed bar with English abbreviation "fine" English (Fine) first letter. Such as: HRBF335, HRBF400, HRBF500. There are higher requirements for the seismic structure, the applicable brand is: after the existing brand plus E (such as: HRB400E, HRBF400E).
Q:What does "4esg25" mean on thread steel?
4esg25 these are the basic information of reinforcement, equivalent to the identity card information. Represents grade four steel (HRB500), and ESG represents the modulus of elasticity of the reinforcement in the reinforcement; then the nominal diameter is 25.
Q:What is the manufacturing process of the hot rolled thread steel production line?
Rebar is a ribbed steel bar, also known as ribbed steel, usually with 2 longitudinal ribs and transverse ribs uniformly distributed along the length. The transverse rib shape is helical, herringbone, crescent 3. Expressed in millimeters of nominal diameter. Nominal diameter of round steel bars of equal diameter equal to the cross section of ribbed bars. The nominal diameter of the steel bar is 8-50 mm, and the recommended diameters are 8, 12, 16, 20, 25, 32 and 40 mm. Ribbed steel bars are mainly subjected to tensile stress in concrete. Because of the function of rib and the greater bonding ability of concrete, ribbed steel bar can bear the effect of external force better. Ribbed steel bars are widely used in a variety of building structures, especially large, heavy, light, thin-walled and high-rise structures.
Q:The difference between wire and thread steel, wire and thread steel difference knowledge
In general, the main differences between the two:1) their yield strength characteristic value is 235300 of wire rod and 335400500. of thread steel2) specifications, diameter, wire specifications 6 or 6.5, 8, 10, 12mm; thread steel specifications 12 - 50mm are.3) common wire line and the line, is a disc (weighing) for sale; steel market at present is selling bar (a rebar), three steel, four steel, by bundling or by root (foot) to sell.
Q:What is the content ratio of the screw steel and manganese steel?
Steel: content index mainly includes: C, Mn, P, S, Si, different grades, different content, its range is C (0.10 ~ 0.40%), Mn < 1.80%, P < 0.050%, S < 0.050%, Si (0.60 ~ 1%).
Q:What is the difference between the material of steel thread and its use?
There are two kinds of thread classification methods:First, the geometric shapes are classified and classified according to the cross sectional shape of the ribs and the pitch of the ribs. For example, the British Standard (BS4449), the steel is classified into type I and type ii.Two is in the performance classification (grade), for example our country standard (G B1499), according to the strength level (yield / tensile strength) will be divided into 3 grades of thread steel;
Q:What does "4E" mean on the rebar?
The meaning of 4E on the rebar is HRB400 seismic reinforcement (HRB400e). 4 is HRB400 (formerly known as grade 3 steel), e is earthquake's e, meaning earthquake resistance. The steel bars marked with e have reached the standard of "anti-seismic" steel issued by the state.
Q:Like a steel rebar and wire spiral, is the same? What's the difference?
The difference is that there are different ways of supplying. One is straight supply, the other is supplied by diskHalf of the price slightly lower than the straight, use less material processing to zero, but more a process.
Q:How much is the difference between the three grade thread steel and the two grade thread steel?
For some time, due to the supply of three threads, and the two level of demand, resulting in two, more expensive than three.
Q:How to calculate the theoretical elongation of finishing thread steel?
The theoretical elongation of fine thread steel is calculated by L=P.L/ (E.A), P is force, L steel bar is longer, E is elastic, and A is area.

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