GBT3094-45 SQUARE HOLLOW SECTION, is the name for GB, JIS called: S45C, ASTM called 1045,080 M46, DIN called: C45. Domestic often called the 45 steel, also called "oil steel." In general, the majority of the market hot spot. Specifications 1.0 ~ 4.0mm cold rolled between.
GBT3094-45 SQUARE HOLLOW SECTION Chemical composition

　　　GBT3094-45 SQUARE HOLLOW SECTION Mechanical properties
　　　Normalizing：850 　；     Quench：840 　；    Tempering：600 　；
　　　Tensile strength: not less than 600Mpa 　；     Yield strength: not less than 355Mpa 　；
　　　Elongation：16% 　；      Shrinkage：40% 　；
　　　Impact energy：39J 　；
　　　Delivery status of steel hardness: not greater than
　　　No heat：229HBS 　；   Annealed steel：197HBS
　　　Implementation of standards
　　　GB/T699-1999 recommended standards for 45 steel normalizing heat treatment temperature is 850 ℃, 840 ℃ quenching, 600 ℃ tempering, achievable performance of yield strength ≥ 355MPa
GB/T699-1999 standard 45 steel tensile strength ≥ 600MPa, yield strength ≥ 355MPa, elongation ≥ 16%, section shrinkage ≥ 40%, the impact energy of 39J.
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