gcr 15 GB/t 18254-2002
Specification 5.5-280
GCr 15 steel is a kind of high-carbon chromium bearing steel with less alloy content, good properties and the most widely used. After quenching and tempering, it has high and uniform hardness.
Good wear resistance and high contact fatigue performance. The steel has moderate cold working plasticity, general machinability, poor weldability and high sensitivity to white spots.
There is temper brittleness.
Specification 5.5~300 material GCr 15
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bearing steel
GCr 15 steel is a kind of high-carbon chromium bearing steel with less alloy content, good properties and the most widely used. After quenching and tempering, the hardness is high and uniform, the wear resistance is good and the contact fatigue performance is high. The steel has moderate cold working plasticity, general machinability, poor weldability, high sensitivity to white spots and temper brittleness.
Chemical composition/element content (%)
c:0.95- 1.05 Mn:0.20-0.40 Si:0. 15-0.35S:& lt； = 0.020 P:& lt； =0.027 Cr: 1.30- 1.65
Its heat treatment system is: steel bar annealing, steel wire annealing or 830-840 degree oil quenching.
Heat treatment process parameters:
1. Ordinary annealing: heating at 790-8 10, furnace cooling to 650, air cooling -HB 170-207.
2. Isothermal annealing: 790-8 10 degree heating, 7 10-720 degree isothermal, air cooling -HB 207-229.
3. Normalization: 900-920 degrees heating and air cooling -HB 270-390.
4. High temperature tempering: heating at 650-700 degrees and air cooling -HB 229-285.
5. Quenching: heating at 860 degrees and oil quenching -HRC 62-66
6. Low temperature tempering: 150- 170 degree tempering, air cooling -HRC 6 1-66.
7. Carbonitriding: 820-830 * *1.5-3 hours, oil quenching, cryogenic treatment at -60 -70+150+160 tempering, air cooling -HRC ≈ 67.
Bearing steel is mainly used to manufacture rolling bearings. Such as balls, rollers and bearing rings. Work under highly concentrated alternating load. Because the contact area between the ball and the bearing ring is small, they slide at high speed, which will produce great friction. Therefore, the steel for rolling bearings should have high hardness, wear resistance and fatigue strength, and the requirements on the metallographic structure and chemical composition of the steel are very strict, otherwise the service life of the bearing will be obviously shortened. Generally, the carbon content of rolling bearing steel is high, ranging from 0.95- 1. 1%, and some alloying elements such as chromium and manganese are added. Most of them are delivered by spheroidizing annealing, which requires quenching (about 840℃) and low temperature tempering (150℃) before use. (1) manufacturing method: the smelting quality of bearing steel is very high, and it is necessary to strictly control the content and distribution of sulfur, phosphorus and non-metallic inclusions, because the content and distribution of non-metallic inclusions have a great influence on the service life of bearing steel. The higher the inclusion content, the shorter the service life. In order to improve the smelting quality, electric furnace smelting and electroslag remelting have been adopted recently, and new processes such as vacuum smelting and vacuum consumable refining can also be adopted to improve the quality of bearing steel. (2) Use: In addition to making balls and bearing rings, it is sometimes used to make tools, such as stamping dies and measuring tools. 6. See Table 6-7-24 for the chemical composition of main steel grades in national standard, metallurgical standard and Japanese standard. Table 6-7-24 Chemical composition index of main steel grades in relevant standards Chemical composition of standard steel grades% C Si Mn P S Cr Mo Ni GB/T 3086-829Cr180.90-1.00 < 0.80 < 0.035 < 0.030/Kloc-. Kloc-0/9.00 GB/T3203-82G20 CRMO0SVJI 0.95-1.100.15-0.35 < 0.50 < 0.025 < 0.90-1. GB ASTJIDIN, DINEN BS, BSEN NP, NPEN TOCL ISO630 brand brand brand brand brand brand bearing steel GCR9 565438
Alloy tool steel hot rolled flat steel
Cr12mo1v1(D2) cjx-z12-2005cjx-z003-2006q/cb53-92 and supplementary provisions.
It is a ledeburite steel with high hardenability, hardening ability, wear resistance, high temperature oxidation resistance, good corrosion resistance after quenching and polishing, and small heat treatment deformation. It is suitable for manufacturing all kinds of cold working molds, props, measuring tools and so on with high precision and long service life.
Specification width 80-150 200-320 321-455 456-550 > 550.
Round steel and square steel can be provided. forge
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tool steel
Cr 12Mo 1V 1 alloy tool steel
Product name:
Cr 12Mo 1V 1 alloy tool steel
Material quality:
Cr 12Mo 1V 1
4cr5mosiv 1
Alloy tool steel: Cr 12Mo 1V 1
Standard: GB/T 1299- 1985
● Features and scope of application:
Cold working die steel is D2 steel imported from America. The composition and properties are similar to those of Cr 12MoV steel, and the use is the same, so it can be used instead.
● Chemical composition:
C: 1.40 ~ 1.60
Silicon Si: ≤ 0.60
Manganese Mn: ≤ 0.60
Sulfur content: ≤ 0.030
Phosphorus P: ≤ 0.030
Chromium Cr:11.50 ~13.00
Nickel Ni: allowable residual content ≤0.25.
Copper and copper: allowable residue ≤0.30.
Vanadium V: ≤ 1.00
Momo: 0.70 ~ 1.20
● Mechanical properties:
Hardness: annealing, ≤255HB, indentation diameter ≥ 3.8 mm; Quenching, ≥59HRC
● Heat treatment specification and metallographic structure:
Heat treatment specification: quenching, preheating at 820 15℃, heating at1000 6℃ (salt bath) or10/0 6℃ (furnace controlled atmosphere), and holding at 10 ~ 20min.
● Delivery status: the steel is delivered in the annealed state.
Cr2cr 2 round steel Cr2 steel special steel Cr2
ф 10~500
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tool steel
Chemical Composition of Cr2 Steel
C 0.95- 1. 1
Chromium 1.3- 1.65
Si %26
Manganese 0.40
Compared with carbon tool steel, Cr2 steel has a certain amount of Cr, and the composition of Cr2 steel is similar to that of ball bearing.
Steel GCr 15 is equivalent. Therefore. Its hardenability, hardness and wear resistance are higher than those of carbon tools, and its wear resistance is better than that of carbon tools.
Contact fatigue strength is also high. The size of steel does not change much during quenching and tempering. With these special functions,
Cr2 steel is widely used in measuring tools, such as templates, splints, sample sets, gauges, block gauges, ring gauges and threaded plugs.
Gauges and sample columns, etc. It can also be used to manufacture cold working dies, such as wire drawing dies and cold heading dies. Cr2 steel can also be used for low
Fast tools cut less hard materials. In addition, Cr2 steel can also be used for cold rolls and other workpieces.
The following are descriptions of the three materials, which you can compare and hope to be helpful to you!