What are the differences between 15crmo steel and 20crmo steel?

1. Difference in chemical composition:

The chemical composition of 15CrMo steel: C: 0.12-0.18 Si: 0.17-0.37 Mn: 0.40-0.70 Cr: 0.80-1.10 Mo: 0.40-0.55

The chemical composition of 20Crmo steel: C: 0.17-0.24 Si: 0.17-0.37 Mn: 0.40-0.70 Cr: 0.80-1.10 Mo: 0.15-0.25

2.Difference between the mechanical properties of 2.15crmo steel and 20CrMo steel

15crmo Mechanical properties: tensile strength: 440mpa, yield strength: 295 mpa, elongation after fracture: 22% , shrinkage after fracture: 60%, impact absorption: 94J.

20crmo Mechanical properties: tensile strength: 885mpa, yield strength: 685mpa, elongation after breaking: 12%, shrinkage after breaking: 50%, impact absorption: 78J.

3.15crmo steel and 20crmo steel performance and application comparison

15CrMo steel belongs to pearlitic heat-resistant steel. It has high durability, high workability and cold strain plasticity below 500-550 degrees Celsius. 15CrMo steel is generally used to make steam after normalizing and high-temperature tempering, the boiler superheater, medium and high pressure steam pipes and headers, the main steam pipe with steam temperature up to 510℃. After quenching and tempering, 15CrMo steel can be used to manufacture various important parts that work at room temperature.

20crmo steel has high thermal strength. At 500-520 degrees Celsius, the thermal strength is still high, hardenability is good, no temper brittleness, cold strain plasticity, workability and weldability are good, generally in quenching and tempering or carburizing in the quenched state. 20crmo steel is used to manufacture non-corrosive media in chemical equipment, high-pressure pipes and various fasteners with operating temperature below 250 degrees Celsius, nitrogen and hydrogen media, and blades, partitions, forgings, and rolled profiles in steam turbines and boilers.

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