24 July 2021 Gear Steel Bar
25CrNiMoV Gear Steel Bar
25CrNiMoV is a high wear resistance hot-forged die steel, its composition design features: good toughness, high strength, good wear resistance. Die steel produced by electric arc furnace (EAF) + refining (LT) + vacuum (VD) has high purity and good performance.
Heat treatment:
Annealing: 760-780 ° C
Hardness: 197-241HB
Quenching temperature: 890-910 ℃, oil cooling,
hardness: 61.5HRC
Tempering temperature:
420-550 ℃, tempering twice
Hardness: 38-47HRC
This steel can be hardened in the air when it is cooled, and is easy to form white spots. Therefore, it should be slowly cooled after forging.
For large forgings, it must be placed in 600 ℃ furnace, until the temperature is consistent, and then slowly cooled to 150-200 ℃, and then cooled in the air.
for larger forgings, it is recommended to cool to 150-200 ℃ immediately after the tempering.
(1) Prominent advantages:
Excellent hardenability.
High strength.
Excellent wear resistance.
(2) Application:
The kind of steel used to make all kinds of large and medium-sized forging.