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Valvata is like as disc screw steel wire together, is also building steel. Hot rolling screwed the new standards are called HRB335, HRB400, HRB500,according to the intensity level (tensile strength yield point /) to the classification, behind the number is the intensity value, the unit is Mpa. H, R, B respectively (Hotrolled), hot rolled ribbed steel bar (Ribbed), (Bars) the threeword's first letter English. Finishing rolling rebar refers to the use of thread steel bar for prestressed concrete, which belongs to the rolled steel used in construction.
It and the ordinary wire bundling mode is the same, but the use of the requiredstraightening. The general market is 6.5-8.0-10-12-14 majority, are building steel.
The advantages of steel - steel disk disk
Screw thread steel is only 9-12, disk can demand random intercept.
Plate steel - disk model
Disk type generally have 6, 8, 10 and three than the thread and wire rodprices are high.
Hot rolled reinforced bar is through the finished steel hot rolling forming and cooling, from low carbon steel and ordinary alloy steel under the condition of high temperature and pressing, mainly used for reinforcement of reinforced concrete and prestressed concrete structure, is one of the varieties of steelused in the largest amount of civil engineering and architecture. Steel bar diameter 6.5 ~ 9 mm, most rolled into plate; the diameter of 10 ~ 40 mm is generally 6 ~ 12 meters long straight. Hot rolled reinforced bar should have a certain strength, i.e. the yield point and tensile strength, it is the main basis forstructure design. Divided into hot-rolled round steel and hot-rolled ribbed bartwo. Hot rolled reinforced bar for soft rigid, fracture occurs when the neckingphenomenon, larger elongation.
Three screw steel HRB400 HRB335 two screw steel, screw thread steel is nowinside the buildings will be less, then the three screw steel and two screw steelis mainly used for what ah, in order to solution to the problem.
Two screw steel subway project more, three screw steel housing constructionprojects more. In addition, the original grade two steel is more, are now in thepromotion of the new grade three steel structure, concrete applications have become very popular. Three screw steel used more in the main reinforced beam column, two screw steel used more in the stirrups, recent governments have issued expressly eliminated high HRB335 two screw steel and HPB235.
So the next day, three screw steel will be applied widely, in addition the seismic(with E) thread steel will be widely applied in our daily life.
There are two commonly used classification method of screw thread steel: one is to shape classification, according to the different spacing section shape andrib rib classification or types, such as the British Standard (BS4449), thethread steel is divided into type I, type ii. Hold this classification of main reaction performance of screw thread steel. Two is the performance of classification (class), for example, China's current implementation of standards, steel as (G B1499.2-2007) wire for 1499.1-2008), according to the intensity level (tensile strength yield point /) will screw thread steel is divided into 3 levels; the Japanese industrial standard (JI SG3112), according to the comprehensive performance will screw thread steel divided into 5 categories;British Standard (BS4461), and also provides some level of performance testof screw thread steel. In addition to the screw thread steel can be classified according to purpose, such as reinforced concrete with ordinary reinforcedand prestressed reinforced concrete heat treatment steel etc..
"Fake hot rolled ribbed steel bar steel on the market (commonly known asthread steel) unqualified factors are mainly: 1, nominal size smaller than actualsize specifications about the actual weight, dealers through purchase,theoretical weight delivery to earn the amount of metal, profits. 2, the relatively low strength. 3, the chemical composition of the unqualified rate high. The main reason is the small rolling mill of substandard ingredients, mixing with soilbillet rolling screw steel caused by.
In the purchase of the screw thread steel, first of all from the outward appearance size, available cursor card measuring simple measurement of the actual size is better than showing the dimension (general screw steel are rolled with the specification marking) about a specification or more (such as Ø12 screw thread steel standard diameter was 11.5 + 0.4mm, and false and inferior rebar diameter are mostly about 10mm). At the same time, someinferior screw thread steel by rolling way to deceive the people vision, so from the end face of the reinforced observation for flat oval shape, and the formalend surface should be the basic circular; second, from the surface quality, and inferior screw steel because of the use of adobe rolling, the surface quality is poor, often with a surface defects, a whole rough sense. At the same time,some small rolling mill of the heating temperature, the rolling speed is not enough, the surface reddish color; third, regular steel in most largemanufacturers factory packing, bundles of steel are hung with metal sign realcorresponding, indicating manufacturers, steel grade, batch number,specifications and test code. And false and inferior steel due to poor production conditions, no large hoisting equipment, mostly small (ten or sobinding) package or in bulk, no metal signs, no guarantee of quality. Of course, to fundamentally avoid buy fake bar, or direct agents to buy name brand manufacturers, especially the province famous brand steel (for three steel "Min light" brand screw steel) has stable quality, and even if the dispute is also easy to handle. Experienced people can also distinguish other chemicalcomposition through spark.
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