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What is the difference between coil screw and rebar?
Release time:
2022-04-20
Many consumers will make a lot of jokes when purchasing coiled screws and rebars because they do not know the difference between coiled screws and rebars. Today, let's take a look at the difference between coiled screw and rebar for your reference.
Many consumers will make a lot of jokes when purchasing coiled screws and rebars because they do not know the difference between coiled screws and rebars. Today, let's take a look at the difference between coiled screw and rebar for your reference.
1. The difference between screw and rebar - definition
Coiled screw steel is a kind of rebar, which refers to ribbed steel with helical transverse ribs on the surface of the steel, and also refers to the rebar that is coiled together like a wire.
2. The advantages of the coil screw: the rebar is only 9-12, and the coil screw can be intercepted at will according to the needs.
Rebar is a common name for hot-rolled ribbed steel bar, which belongs to small section steel and is mainly used for the skeleton of reinforced concrete building components. In use, certain mechanical strength, bending deformation performance and process welding performance are required. The raw material billet for producing rebar is carbon structural steel or low-alloy structural steel that has been smelted by sedation, and the finished steel bar is delivered in hot-rolled, normalized or hot-rolled state.
3. Threaded steel screw
Basic Contents Grade 2, Grade 3 and Grade 4 rebars are the old names of the past, and the new standards are called HRB335, HRB400, HRB500 respectively, which are classified according to the strength level (yield point/tensile strength), and the following numbers It is the intensity value, the unit is Mpa. H, R, and B are the first English letters of the three words, Hotrolled, Ribbed, and Bars, respectively. Finished threaded steel bars refer to threaded steel bars for prestressed concrete, which are steel for construction.
4. As the name suggests, the coiled screw is a rebar that is coiled together like a wire, and it is also a steel for construction.
Strength performance test
(1). Performance indicators: The inspection items for evaluating the mechanical properties of rebar include tensile test (tensile strength, yield strength, elongation), bending test (one-time bending and reverse bending). The specific indicators are listed in Table 6-7-7.
(2). Inspection method: ① Tensile test method: Commonly used standard test methods include GB/T228-87, JISZ2201, JI SZ2241, ASTMA370, ГОСТ1497, BS18, etc.; ② Bending test method: Commonly used standard test methods include GB/T T232-88, JISZ2248, ASTME290, ГОСТ1401 9, etc.
5. Specifications and quality 21. Specifications: The specification requirements of rebar should be listed in the import and export trade contract.
Generally, it should include the standard grade (type code), the nominal diameter of the steel bar, the nominal weight (quality), the specified length and the tolerance value of the above indicators. The relevant standards are listed in "7". For 8, 10, 12, 16, 20, and 4, the rebar series with a nominal diameter of 0mm are recommended by Chinese standards. The supply length is divided into two types: fixed length and double length.
The selection range of fixed length of rebar exported in my country is 6~12m, and the selection range of fixed length of rebar produced in Japan is 3.5~10m. 2. Appearance quality: ① Allowable value of external dimension deviation.
The requirements for the curvature of the rebar and the geometry of the rebar are specified in the relevant standards. As stipulated in Chinese standards, the bending degree of straight steel bars is not more than 6mm/m, and the total bending degree is not more than 0.6% of the total length of the steel bars. ②Surface quality.
Relevant standards stipulate the surface quality of rebar, which requires that the ends should be cut straight, and the surface should not have cracks, scars and folds, and there should be no harmful defects in use.
Specifications and standards Commonly used rebar specifications are as follows: GB700-88 (carbon structural steel); GB/T 2101-89 (general provisions for acceptance, packaging, marking and quality certificates of shaped steel); GB1499-91 (concrete steel bar); JIS G3112-87 (98) (steel bar for reinforced concrete); JISG3191-66 (94) (shape, size, weight and tolerance of hot-rolled steel bar and coil bar); BS4449-97 ( hot-rolled steel bars for concrete structures).
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