Baosteel GCr15 bearing steel, what material is GCr15, GCr15

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Material properties: Steel is the most widely used high carbon chromium rolling bearing steel and low alloy cold work die steel. It is a universal cold work die steel with the best comprehensive performance for water and oil quenching. The spheroidized annealed bearing steel used for guide posts and guide sleeves has less alloy content. After quenching and tempering, it has high and uniform hardness, good wear resistance, and high contact fatigue performance. The cold working plasticity of this steel is medium, the workability is average, the plasticity and toughness are good, the weldability is poor, and it is highly sensitive to the formation of white spots.
It is used to produce small-section quenched and tempered parts that can withstand large loads, large normalized parts with small stress, and surface-hardened parts that do not require high core strength. There is a tendency to form cracks during water quenching. Parts with complex shapes should be quenched in hot water or oil because the weldability is poor.
The oil quenching size of this steel is 3~3. It is generally not recommended to forge steel for bearings. The temper brittleness temperature is ~℃.
Delivery status
Annealed state, hardness.
Chemical composition
According to standard B/-, the chemical composition (mass fraction) of this steel is ~.,
.~.3,.~.,.~.,,.
Reference corresponding grades
China B standard grade, American standard grade, Japanese standard grade,
Swedish standard grade and German standard grade.
Critical point temperature (approximate value)

℃, r
℃.
Ordinary annealing specifications
Annealing temperature ~ ℃, furnace cooling to ℃, air cooling out of the furnace, hardness ~ B.
Normalizing specifications
Normalizing temperature ~ ℃, holding time: salt bath furnace ~ 3/, air furnace ~ /,
air cooling, hardness ~.
Spheroidizing annealing specifications
The annealing temperature is ~°C, and the heat preservation is ~°C, and then the furnace is cooled to ~°C at a cooling speed of 3°C/, and then
is air-cooled out of the furnace. Isothermal temperature ~ ℃, isothermal ~ furnace cooling to ~ ℃, air cooling out of the furnace, hardness ~ B.
Isothermal annealing
Annealing temperature ~ ℃, insulation ~ isothermal temperature ~ ℃, air cooling, hardness ~
B.
High temperature tempering
Tempering temperature ~℃, air cooling, hardness ~B.
Annealing specifications for reworked and refurbished molds
Annealing temperature ~ ℃, insulation ~ 3 air cooling.
General quenching and tempering specifications
Quenching temperature 3～℃, oil cooling, hardness～, tempering temperature～℃, hardness～
.
High temperature quenching and tempering specifications
Quenching temperature ~ ℃, oil cooling, tempering temperature ℃, oil bath cooling.
Dual medium quenching specifications
℃.~Heating, pre-cooling first~, take the upper limit in summer, lower limit in winter,
When the corners of the mold are cooled to ~℃, quickly quench () into an aqueous solution middle. Water cooling time is calculated as .~./.
After the water is discharged, it is then air-cooled, and then quenched into the engine oil and cooled to ℃ to discharge the oil, (
℃) 3~3. Tempering. Mold hardness.
Spheroidizing annealing + quenching + secondary tempering specifications
This process is to add secondary tempering on the basis of the original process. After secondary tempering, the hardness must be controlled
at ~.
This process is used for small bearing roller cold stamping molds, with a service life of up to thousands of pieces, greatly reducing costs and significantly improving economic benefits.
Alkaline solution graded quenching, low and high temperature tempering
~℃ preheating~, ~℃ heating (heating coefficient is based on 3/meter), ~
°C~3 alkali bath graded quenching, ~℃ Tempering, tempering at 3~3℃.
The service life of the die is doubled.
High-temperature solid solution and circulating heating quenching double refinement process specifications
According to the needs of cold punching dies, a salt bath is used to carry out high-temperature solid solution and circulating heating quenching double refinement process without
reducing the strength and In the case of wear resistance, improve mold toughness.
Carbonitriding specifications
Heating temperature ~ 3℃, co-infiltrating time ~ 3. Oil cooling, cryogenic treatment temperature -~-℃.
Tempering temperature ~℃, air cooling, hardness.
Rare earth vanadium boron co-infiltration + quenching process
℃ rare earth vanadium boron co-infiltration, the furnace is cooled to ℃ (press/heating insulation), pre-cooled to ~
After quenching oil, ℃. fire.
Salt bath vanadium infiltration process
The main ingredients of salt bath:
Water powder.
℃3 vanadium quenching + ℃ tempering, the depth of the infiltration layer from the surface to the inside is the white bright layer (thickness
) and the transition layer. The surface hardness is 3~3. (The hardness of the boronized layer is only ~.).
Laser heat treatment specifications
Use
laser quenching, power density .3/, defocus amount 3, scanning speed
/, and the workpiece shall be phosphated before laser treatment.
Typical application examples
) This steel is used for punching dies, which require high wear resistance for convex and concave dies. The hardness is required when making the convex molds, and the hardness is required when making the concave dies.
) Used for open-ended mold integral modules: light load, larger size, surface hardness >, core hardness
<.
3) Used for inlay module sets: large and medium-sized molds with heavy loads and complex shapes, cold heading dies for mass production of steel balls and rollers

) Steel for guide post and guide sleeve.
) The service life of the cold punch processed by the double refinement process of high-temperature solid solution and circulating heating and quenching has been increased from
the original conventional heat treatment process to that of the original one.
) The steel adopts high-temperature quenching process and is used for powder metallurgy stamping molds. The service life is increased from the original 3 to
pieces.
) is used for steel extrusion cutting dies. After rare earth vanadium boron co-infiltration and quenching process, the service life of the die
is increased by 3~ times.
) After the steel refractory brick mold is treated by the dual-media quenching process, the service life of the mold is greatly improved.
) After the steel cold stamping die is processed by laser, the service life is improved from that of the original ordinary processed piece.
) After the cold drawing mold of steel seamless steel pipe is treated with vanadium, the bite resistance and wear resistance are significantly improved
, and the continuous drawn pipe is increased from the original one.
) can be used for hardened plastic mold steel.
) is used for thermosetting plastic molding molds that require high wear resistance and high strength.
3) Used for mold guide posts and guide bushes.