20#Round SteelBelongsyouhziLow-carbon carbon steel, cold-rolled, case-hardened steel. The steel has low strength but good toughness, ductility, and weldability. Tensile strength is253-500MPa, elongation ≥24%。20Features &15Steel is basically similar, but with slightly higher strength. Applications: Suitable for manufacturing various parts in the automotive, tractor, and general machinery manufacturing industries, which are not particularly important and are of medium to small sizes, such as handbrake shoes, lever shafts, gear shift forks, drive passive gears on cars, camshafts, suspension equalizers, and bearing bushes on tractors; used in the hot rolling or normalizing state for manufacturing various mechanical parts that are not subjected to high stress but require high toughness; in heavy and medium-sized machinery manufacturing, such as forged or pressed rods, hooks, levers, sleeves, fixtures, etc.; and in the turbine and boiler manufacturing industries, it is often used for parts with pressure ≤6N/Square, Temperature ≤450Tubes, flanges, headers, and various fasteners operating in non-corrosive media at temperatures; used for manufacturing crucible castings such as crossheads and pistons on railroads and locomotive vehicles. Normalizing can promote spheroidization of the steel, refine large lamellar proeutectic ferrite, and improve...160HBSRaw material's machinability.
20#Round steel delivery condition and hardness: as-rolled, hardness ≤156HBS。
20No. Round Steel225Allowable stress at ℃:(16-36mm)111-124MPaBetween;(6-16mm)Between117-131MPa 20No. Round Steel100Allowable stress at °C:150° Celsius,
20The allowable stress for No. steel pipe is130 MPa
20The allowable stress for the forged billet steel bars is108MPa
20No. Round Steel20It refers to the carbon content, the carbon content is0.2%It belongs to low-carbon steel. Steel can be divided into low-carbon, medium-carbon, and high-carbon steel.
Carbon content: Low-carbon steel is generally less than0.25%Medium carbon steel is generally used for...0.25～0.60%Between; High carbon steel is generally greater than0.60%Carbon is contained in the steel.(C)Elements containing a certain amount of silicon for deoxygenation(Si)(Generally not exceeding0.40%),Manganese(Mn)(Generally, not exceeding0.80%,Highly available1.20%)Alloy Elements Out,Free from other alloying elements(Excluding residual elements.)Distinguish between steel and iron: carbon content below2.11%For steel, carbon content exceeding2.11%For iron; the higher the carbon content in steel, the lower its toughness. Conversely, the higher the carbon content in iron, the better its toughness.
