Chinas reinforcing steel is among the worlds leading steel products, with excellent mechanical and chemical properties, exceptional welding performance, and reliable corrosion resistance. Its mechanical properties are also suitable for a variety of applications.
The most commonly used reinforcing steel grades in China are grade I, II, III and IV. The product is typically divided into four categories: black or lightly oiled, galvanized, and PVC covered. Each grade is specified in terms of its yield strength, ultimate tensile strength, and chemical composition.
The grade I reinforcing steel is one of the most prevalent types of steel used in China. It has a minimum yield strength of 200 MPa (29,000 psi) and a minimumultimate tensile strength of 255 MPa (37,000 psi). Chemical composition for this steel grade consists of carbon (C) 0.13-0.2%, sulphur (S) 0.035%, and phosphorus (P) 0.030-0.050%. The grade I steel is generally used for various construction applications such as buildings, rotary drums, pressure vessels, and bridges, to name a few.
Grade II reinforcing steel is much higher in yield strength compared to grade I and possesses a minimum yield strength of 300 MPa (44,000 psi). It also possesses a higher ultimate tensile strength of 420 MPa (61,000 psi). The chemical composition of grade II steel includes carbon 0.16-0.25%, sulphur 0.010%, phosphorus 0.030%. The grade II steel is mostly used for large-diameter applications such as roads, bridges, etc.
Grade III steel is the toughest of the four grades and offers a high yield strength of 580 MPa (84,000 psi) and a minimum ultimate tensile strength of 750 MPa (109,000 psi). Chemical composition of this grade includes carbon 0.20-0.35%, sulphur 0.010%, and phosphorus 0.030%. The grade III steel is usually used for high-strength buildings and bridges.
The grade IV steel has the highest yield strength of 1050 MPa (152,000 psi). This grade also provides very good weldability and has a minimum ultimate tensile strength of 1200 MPa (174,000 psi). The chemical composition for grade IV steel consists of carbon 0.32-0.45%, sulphur 0.010%, and phosphorus 0.030%. Grade IV steel is ideal for heavy load-bearing structures, such as aircraft hangers.
Reinforcing steel grades in China are divided into four categories and each grade has unique mechanical and chemical properties.Grade I has the lowest yield strength (200 MPa or 29,000 psi) and is mostly used for building and pressure vessel applications. Grade II has a higher yield strength (300 MPa or 44,000 psi) and is used mostly for larger construction projects such as roads, bridges, etc. Grade III has the highest yield strength of 580 MPa (84,000 psi) and is used for high strength buildings and bridges. Grade IV has the highest yield strength of 1050 MPa (152,000 psi) and is the ideal choice for heavy load bearing structures.
