Korea standard hot rolled reinforced bar

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Korea standard steel is also known as the deformed bars, surface bamboo shaped protrusions square or round steel, used for reinforced concrete, than the general square steel and round steel with more firmly. Early domestic steelform is bamboo, then reference the British standard, is now hot rolled ribbed steel bar, JIS and Korean standard screw thread steel or bamboo form.

Hot rolled reinforced bar should have a certain strength, i.e. the yield point and tensile strength, it is the main basis for structure design. At the same time, in order to meet the structural deformation, absorb the earthquake energy andprocessing requirements, hot rolled reinforced bar should also have theplasticity, toughness, welding and bonding properties between steel bar and concrete good.


Reinforced grade

The strength grade of 24/38 kg, is made of round steel bar killed steel, semi killed steel rimmed steel No. 3 or ordinary carbon steel rolling. It belongs to the low strength steel, has good plasticity, high elongation (delta 5 above 25%),easy bending forming, easy welding etc.. It is used very widely, can be used asthe main force in the reinforcement of reinforced concrete structure, small,member of the stirrups, steel, wood structure of the rod. Wire rod steel can be used as cold drawn low carbon steel wire and double reinforced materials.

II grade reinforced bar

Low alloy steel rolling or semi killed steel reinforced with grade II, with silicon,manganese as solid solution strengthening elements. Level II steel bar intensity level of 34 (32) /52 (50) kg, its high strength, good plasticity, the welding performance is good. The surface of steel rolling longitudinal rib longand uniformly distributed transverse rib, thereby strengthening the bondbetween concrete and steel bars. As with level II steel reinforced concretestructure stress of reinforced, than the use of reinforced grade of steel can be saved 40 ~ 50%. Therefore, widely used in large and medium-sized steel reinforced concrete structure, such as the main reinforcement of bridges,dams, port engineering and building structure. Level II steel after cold drawing,can also be used as prestressing steel building structure.


III main performance level II steel reinforced with roughly the same strengthlevel for 38/58 kg. Grade was renamed the HRB400 Grade Reinforced bar.Simply put, the same point of the two kinds of steel bar is: all belong to thecommon low alloy hot rolled reinforced bar; belong to the ribbed bar (usually said that the thread bars); can be used for ordinary reinforced concrete structure.

IV grade reinforced bar

IV reinforced the strength level of 55/85 kg, medium carbon low alloy killed steel rolling, which are divided by silicon, manganese as main alloy elements,also adding vanadium or titanium as solid solution and precipitationstrengthening elements, which increases the strength at the same time ensure its plasticity and toughness. Grade rebar surface is rolled with the longitudinal reinforcement and transverse rib, which is the main housing construction of theprestressed reinforced. Reinforcing bar of grade before use by the construction unit for cold processing, cold stress is 750 MPa, in order to improve the yield point, exert the inherent potential of steel products, achieve the purpose of saving steel. The cold drawn steel bar, the yield point is not obvious, so the design in cold stress Statistics (cold drawing design strength)as the basis. But the cold had reinforced after months of natural aging orartificial heating aging, reinforced will appear short yielding stage, its value is slightly higher than that of cold stress, at the same time the steel withhardened tendency, this phenomenon is called "age hardening". Therefore,cold drawn steel while guaranteeing the provisions of cold stress, to control thecold drawing elongation but, lest reinforced brittle. IV grade steel with high carbon content, the general use of flash butt welding - warm - flash welding ortechnology electric heat treatment after welding, to ensure that the weldinghead, including the heat affected zone of hard tissue does not producequenching, prevent the occurrence of brittle fracture. IV grade reinforced bardiameter is 12 millimeter commonly and widely used in prestressed concreteslabs and bundle configuration for components of large prestressedconstruction (such as the roof, crane beam). Hot rolling reinforcing bar of grade as prestressed reinforced when in use, still need to be drawn, welding,its strength is low, the need to further improve.

Finishing rolling rebar

In order to solve the problem of large diameter and high strength prestressed reinforcement and anchorage connection problems, has been developed successfully finishing rolling rebar. It is in the direct rolling steel surface withoutlongitudinal reinforcement and transverse rib reinforced trapezoidal screw buckle shape, available connection sleeve connected with long, with a specialnut as anchorage. This steel has been used in large scale prestressed concrete structure, bridge structure, success.

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Q:What is the difference between rebar and round steel?
The raw steel billet for the production of threaded steel is carbon structural steel or low alloy structural steel which is treated by calm melting, and the finished hot rolled steel bar is delivered in hot rolling forming, normalizing or hot rolling state
Q:Why can not the finish thread steel be welded?
Finish rolling thread steel can be directly connected with sleeve, and do not use wire; you want to weld can also, it is estimated that the user does not require welding, welding prone to appear strong phenomenon. If welding is used, buy the finish steel, which is more expensive than the other threads of the performance.
Q:Two grade steel and three grade steel difference, the construction of the use of thread steel in general how to use the level?
The difference is mainly in strength. The higher the grade, the greater the tensile strength.
Q:What are the marking of the steel bars on the mills? Which factory is the 2LG16 thread?
Each steel bar has an identification, each steel bar has a nameplate, each batch of steel bars have factory qualification certificate, and the qualification certificate is corresponding to the nameplate and the corresponding content of the identification, and has traceability.
Q:25 screw steel, how many meters per meter?
25 thread steel one meter 3.86kg.Method of calculation: 0.00617 times the square of the diameter of the steel bar. The weight of each diameter of the steel bar (kg) can be calculated.Steel is known as hot rolled ribbed bar.
Q:Why is thread steel thinner than crude?
Thread steel is used for the construction of reinforced concrete facilities, his material is generally low alloy steel grades is generally 16Mn (16 Mn low-alloy steel), or 45 carbon just, their yield strength is above 350Mpa, tensile strength 500Mpa, low carbon steel round steel than ordinary much higher (after heat treatment of the steel strength than low carbon steel nearly twice as high or higher)
Q:The difference between rebar and crescent
The thread and Crescent are 45 degrees diagonally raised, the thread is straight, crescent shaped arc, like a watermelon rind.
Q:Is thread steel rod or wire?
Steel wire and wire is not round, small diameter 6.5-12mm, like line, which is straight thread steel bar with ribs, although a small diameter of the disk, but does not belong to the bar, is the construction of a reinforced bar, refers to the solid bar, is not the same in detail. Tiantai into ZhiShiLei article can see
Q:How to distinguish the quality of thread steel?
Inferior steel thin and thin, often appear inadequate discontent, because manufacturers in order to achieve large negative tolerance, finished products before a few of the pressure reduction is too large, iron type is small, filled with dissatisfaction.
Q:What is the difference between the actual weight and the actual weight of the steel thread?
The actual weight is weighed and weight is calculated according to the theory of diameter *0.00617*M* diameter * * the number of root number general weight were weighed weight greater than you look at this with the giant is even large or small factory of some difference.

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