What type of welding rod is needed for the construction of three grade steel bars used in construction?
Go to the specifications, and the material list has a given name, such as 1499.2-2007
In the construction industry, the second grade reinforced bar and the third grade steel bar are called in the past (old standard), and the new standard is replaced by the second grade reinforcing bar HRB335 grade steel, and the third grade steel bar is changed into HRB400 grade steel bar.In brief, these two kinds of reinforcing bars have the same points: they belong to ordinary low alloy hot rolled steel bars, all of which belong to ribbed reinforcing bars (commonly known as rebar), and can be used in ordinary reinforced concrete structures.The main differences are: 1. grades of steel are different (chemical composition is different). HRB335 grade steel is 20MnSi (20 MN SI); HRB400 grade steel is 20MnSiV or 20MnSiNb or 20MnTi.2. with different strength, tensile strength and compressive strength design of HRB335 grade steel is 300MPa, tensile strength, compressive strength design of HRB400 grade steel is 360MPa. The tensile strength and compressive strength of the welding rod J422 are 420MPa.3.. Because of the difference of chemical composition and ultimate strength of steel, they are different in toughness, cold bending and fatigue resistance.
Three grade steel is welded with J502 (E5002) structural steel electrode, and AC DC welder can.Three rebar: the new standard name for HRB400 steel, three steel for the old, as a kind of hot rolled ribbed bar. In construction, three - grade rebar is called the past.The steel manufacturers in China are mainly distributed in the north and northeast, North China, Tang Gang, such as Shougang steel, bearing steel, Shanxi steel, Baoding iron and steel Zhongyang Puri, northeast regions such as northern Taiwan, Fushun Steel resistant, etc., these two regions accounted for more than 50% of the total output of thread steel.The difference between round bar and round bar is that the surface has longitudinal ribs and transverse ribs, usually with two longitudinal ribs and transverse ribs uniformly distributed along the length direction. The rebar is a kind of small section steel, mainly used for the skeleton of reinforced concrete construction members. In use, some mechanical strength, bending deformation property and welding performance are required. 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 steel bar is delivered in hot rolling forming, normalizing or hot rolling state.
