70 round steel material standard and chemical composition, implementation of the standard GB/T 699-1999,70 steel and 65 steel properties similar, slightly higher elastic and strength, no. 70 steel is suitable for making circular and square spiral springs of general machines with small cross section and low strength requirements, such as supporting leaf barrel, children’s tunnel, pet tunnel products such as flat leaf spring and circular spiral spring.
Chemical composition: C: 0.67 ~ 0.75 Si: 0.17 ~ 0.37 Mn Mn: 0.50.0.80 s: ≤0.035 p: ≤0.035 Cr: ≤0.25 Ni: ≤0.30 Cu: ≤0.25 mechanical properties edit mechanical properties of steel 70: tensile strength σb (MPa)≥715, tensile strength of steel 70, tensile strength of steel 75, tensile strength of steel 70, tensile strength of steel 70, tensile strength of steel 70, tensile strength of steel 70, tensile strength of steel 70, tensile strength of steel 70, tensile strength of steel 70, tensile strength of steel 70, tensile strength of steel 7 Yield strength σs (MPa)≥420, elongation δ5(%)≥9, section shrinkage ψ (%)≥30, hardness HBS: unheat-treated ≤269, annealed steel ≤229, specimen blank size: 25mm and T7, and 70 belongs to high-quality carbon structural steel, in the use is different. In addition to carbon in the composition is not the same, tool steel in order to reduce the cold brittleness, hot brittleness of the sulfur phosphorus element content is lower.
70 steel round steel material standard and chemical composition 70 steel carbon steel according to chemical composition (that is, carbon content) can be divided into low carbon steel, medium carbon steel and high carbon steel.
Post time: Nov-25-2023