Warranty sales of 4130 alloy steel pipe manufacturer

4130 structural steel has high strength and toughness, high hardenability, and the critical hardening diameter in oil is 15～70mm; the thermal strength of steel is also good, with sufficient high temperature strength below 500℃, but at 550℃ Its strength decreases significantly; when the alloy element is at the lower limit, the welding is quite good, but when the alloy element is close to the upper limit, the weldability is medium, and it needs to be preheated to above 175℃ before welding; the machinability of steel is good, and the plasticity during cold deformation is medium; The range of 300～350℃ has the first type of temper brittleness; there is a tendency to form white spots. This kind of steel is usually used in the quenched and tempered state. When the carbon content is the lower limit, the steel 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, studs, gears, etc.; in the chemical industry Used to manufacture welded parts, welded structures composed of plates and pipes, and high-pressure pipes that work in a nitrogen-hydrogen medium with a temperature not exceeding 250°C; used in the manufacturing of steam turbines and boilers to make fasteners that work below 450°C, Flanges and flange covers subject to high pressure below 500°C.
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
Tensile strength σb (MPa): ≥930(95) Yield strength σs (MPa): ≥785(80)
Elongation δ5 (%): ≥12
Reduction of area ψ (%): ≥50
Impact energy Akv (J): ≥63
Impact toughness value αkv (J/cm2): ≥78(8)
Hardness: ≤229HB
Sample size: sample blank size is 25mm
Heat treatment specification: quenching at 880°C, water cooling, oil cooling; tempering at 540°C, water cooling, oil cooling.