Steel with high strength and toughness
4130 structural steel is steel that is used to meet a specific strength.
The steel has high strength and toughness, high hardenability, and a critical hardening diameter of 15~70mm in oil; The thermal strength of steel is also good, and it has sufficient high-temperature strength below 500 °C, but its strength decreases significantly at 550 °C. When the alloying element is welded well at the lower limit, but the weldability is medium when it is close to the upper limit, and it needs to be preheated to more than 175°C before welding; The machinability of the steel is good, and the plasticity is medium when cold deformed; In the range of 300~350 °C during heat treatment, there is the first type of tempering brittleness; There is a tendency to form white spots.
1.1 Application
2. 2 Chemical composition
3. 3 Mechanical properties
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This type of steel is usually used in a quenched and tempered state, and when the carbon content is the lower limit, it can also be used as a carburizing steel that requires a higher core strength. In the medium-sized machinery manufacturing industry, it is mainly used to manufacture quenched and tempered parts with large cross-sections and working under high stress conditions, such as shafts, spindles, and high-load control wheels, bolts, stud bolts, gears, etc.; In the chemical industry, it is used to manufacture welded parts, welded structures composed of plates and pipes, and high-pressure conduits that work in nitrogen-hydrogen media at a temperature not exceeding 250 °C; In the steam turbine and boiler manufacturing industry, it is used to manufacture fasteners working below 450°C, flanges and flange covers that are subjected to high pressure below 500°C.
chemical composition
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Carbon C: 0.28~0.33
Silicon Si: 0.15~0.35
Manganese Mn: 0.40~0.60
Sulfur S: Allowable residual content≤0.040
Phosphorus P: Allowable residual content ≤ 0.035
Chromium Cr: 0.80~1.10
Nickel Ni: Allowable residual content≤0.030
Copper Cu: Allowable residual content ≤ 0.030
Molybdenum Mo: 0.15~0.25
Mechanical properties
Tensile Strength σb (MPa):≥930(95)Yield Strength σs (MPa):≥785(80)
Elongation δ5 (%): ≥12
Section shrinkage ψ (%): ≥50
Impact power Akv (J): ≥63
Impact toughness αkv (J/cm2):≥78(8)
Hardness: ≤229HB
Specimen size: The specimen blank size is 25mm
Heat treatment specification: quenching 880°C, water-cooled, oil-cooled; Tempered at 540°C, water-cooled, oil-cooled
Grace Ma
Post time: Dec-20-2024
