30CrMo seamless steel pipe is a alloy structural steel under GB/T 3077 standard. 30 refers to the carbon content. Chinese brand 30CrMo equivalent to Japanese grade is SCM430. Katalor can supply 30CrMo alloy structural steel seamless pipes with large quantity.
Main Features:
30CrMo steel material has high strength and toughness, high hardenability, and a critical hardenable diameter of 15 to 70 mm in oil; steel has good thermal strength, and has sufficient high temperature strength below 500 ° C, but at 550 ° C The strength is significantly reduced; when the alloying element is at the lower limit, the welding is quite good, but the weldability is moderate when it is close to the upper limit, and it needs to be preheated to above 175 °C before welding; the machinability of the steel is good, the plasticity is moderate during cold deformation; The range of ~350 ° C has the first type of temper brittleness; there is a tendency to form white spots.
Heat treatment → Quenching → Heating temperature /℃ = First quenching：850
Heat treatment → Quenching → Heating temperature /℃ = Second quenching：—
Heat treatment → Quenching → Coolant: Oil
Heat treatment → Tempering → Heating temperature /℃：550
Heat treatment → Tempering → Coolant: Water, Oil
Annealed annealing "760±10 °C annealing, furnace cooling to 400 ° C air cooling. HB220-230
Normalizing: 860±10°C normalizing, normal air cooling.
What is Use of Alloy Structural Steel Seamless Pipes 30CrMo?
30CrMo steel is usually used in a quenched and tempered state, and a steel having a lower carbon content can also be used as a carburized steel requiring a higher core strength. In the medium-sized machinery manufacturing industry, it is mainly used to manufacture quenched and tempered parts with large cross-section and working under high stress conditions, such as shafts, spindles and high-load steering wheels, bolts, studs, gears, etc.; in the chemical industry a welded structure for the manufacture of welded parts, plates and pipes, and a high-pressure pipe that does not exceed 250 ° C in a medium containing nitrogen and hydrogen; a fastener used in the manufacture of steam turbines and boilers for manufacturing below 450 ° C. High pressure flanges and nuts below 500 °C, especially suitable for the manufacture of ducts operating at 300 atm and below 400 °C.
