 |
| Quantity: | |
|---|---|
FORGE-S
ETERNAL
Cardan Shaft Material
Steel mill universal shafts usually work under heavy loads, impact loads, and high temperature environments, so the material must have high tensile strength and good hardenability. 34CrNiMo6 is perfectly suited for this working condition due to its characteristics of "high strength, high toughness, and high hardenability".
34CrNiMo6 Chemical Composition
| C | 0.30% - 0.38% | ensure the strength and hardness of the matrix, providing a foundation for quenching strengthening |
| Si | ≤0.40% | strengthen ferrite and enhances antioxidant properties |
| Mn | 0.50% - 0.80% | assist in improving hardenability and strength, and enhancing thermal processing performance |
| Cr | 1.30% - 1.70% | improve hardenability, wear resistance, and oxidation resistance |
| Ni | 1.30% - 1.70% | significantly improve low-temperature toughness and plasticity, enhancing impact resistance |
| Mo | 0.15% - 0.30% | suppress temper brittleness, refine grain size, enhance high-temperature strength and creep resistance |
| P/S | ≤0.035% | Strictly control the content to reduce the risk of brittleness and cracking |
Cardan Shaft Feature
The 34CrNiMo6 universal joint is characterized by high strength, high toughness, deep quenching, excellent fatigue and wear resistance, and is suitable for high load and variable working condition power transmission. It is widely used in heavy machinery, ships, wind power and other fields.
Strong and tough balance: After quenching and tempering (850 ℃ oil quenching+580 ℃ tempering), the tensile strength is 1100-1200MPa, the yield is ≥ 940MPa, the elongation is ≥ 14%, the impact absorption energy is ≥ 40J, and the "surface hardness and core toughness" (surface 55HRC+, core 30-35HRC), with outstanding resistance to impact and brittle fracture.
Deep hardening: Chromium molybdenum manganese synergistically forms a 1.2-1.6mm hardened layer on parts with a diameter of 20-60mm, and the large cross-section can still be uniformly hardened, meeting the strength and toughness requirements of large-sized universal joints.
Fatigue and Wear Resistance: Surface carbides enhance wear resistance, while the core matrix suppresses crack propagation. The low/high cycle fatigue life is significantly extended, making it suitable for alternating load conditions.
Processing and welding: The cutting efficiency is 20% -30% higher than that of carbon steel, and the tool life is extended by about 30%; Controlling preheating and post weld heat treatment can ensure welding quality and meet the requirements of complex structural manufacturing.
Production Procedure
Forging,Rough Heat Treatment,Rough Machining,Quenching & Tempering,Surface Treatment,Finish Machining,Inspection and Packaging
Heat Treatment&Surface Treatment
Quenching and Tempering:
Object: Shaft fork, intermediate shaft pipe.
Process: Quenching (840 ° C ± 10 ° C oil cooling)+High temperature tempering (540 ° C ± 10 ° C).
Result: The tempered martensite structure is obtained, and the hardness is usually controlled at HB 260-320 or HRC 28-33, ensuring a match between strength and toughness.
Carburizing&Quenching:
Object: Cross shaft, sliding spline tooth surface.
Process: carburizing at around 930 ° C, followed by quenching and low-temperature tempering.
Result: Surface hardness HRC 58-62, heart hardness HRC 30-45. Surface wear resistance, heart impact resistance.
Intermediate frequency induction hardening:
Object: Spline shaft guide surface.
Result: Localized hardening improves wear resistance.
Surface Treatment
The environment of steel mills is usually accompanied by water, iron oxide scale, and dust, which cause severe corrosion.
Shot Blasting/Sandblasting:
Remove oxide scale and rust, increase coating adhesion.
Primer:
Epoxy Zinc Rich Primer is commonly used to provide cathodic protection and strong rust resistance.
Topcoat:
Polyurethane topcoat or alkyd enamel.
Color: Steel mills usually have specific color codes for management, commonly red, blue, or orange, for visual identification and safety warnings under high temperatures.
Lubrication:
Although not a coating, it is also a part of surface protection. Fill the bearings and spline pairs with EP grease to prevent sintering.
Non destructive testing (NDT)
Ultrasonic testing (UT) and magnetic particle testing (MT) must be performed after heat treatment to ensure no cracks.
Cardan Shaft Material
Steel mill universal shafts usually work under heavy loads, impact loads, and high temperature environments, so the material must have high tensile strength and good hardenability. 34CrNiMo6 is perfectly suited for this working condition due to its characteristics of "high strength, high toughness, and high hardenability".
34CrNiMo6 Chemical Composition
| C | 0.30% - 0.38% | ensure the strength and hardness of the matrix, providing a foundation for quenching strengthening |
| Si | ≤0.40% | strengthen ferrite and enhances antioxidant properties |
| Mn | 0.50% - 0.80% | assist in improving hardenability and strength, and enhancing thermal processing performance |
| Cr | 1.30% - 1.70% | improve hardenability, wear resistance, and oxidation resistance |
| Ni | 1.30% - 1.70% | significantly improve low-temperature toughness and plasticity, enhancing impact resistance |
| Mo | 0.15% - 0.30% | suppress temper brittleness, refine grain size, enhance high-temperature strength and creep resistance |
| P/S | ≤0.035% | Strictly control the content to reduce the risk of brittleness and cracking |
Cardan Shaft Feature
The 34CrNiMo6 universal joint is characterized by high strength, high toughness, deep quenching, excellent fatigue and wear resistance, and is suitable for high load and variable working condition power transmission. It is widely used in heavy machinery, ships, wind power and other fields.
Strong and tough balance: After quenching and tempering (850 ℃ oil quenching+580 ℃ tempering), the tensile strength is 1100-1200MPa, the yield is ≥ 940MPa, the elongation is ≥ 14%, the impact absorption energy is ≥ 40J, and the "surface hardness and core toughness" (surface 55HRC+, core 30-35HRC), with outstanding resistance to impact and brittle fracture.
Deep hardening: Chromium molybdenum manganese synergistically forms a 1.2-1.6mm hardened layer on parts with a diameter of 20-60mm, and the large cross-section can still be uniformly hardened, meeting the strength and toughness requirements of large-sized universal joints.
Fatigue and Wear Resistance: Surface carbides enhance wear resistance, while the core matrix suppresses crack propagation. The low/high cycle fatigue life is significantly extended, making it suitable for alternating load conditions.
Processing and welding: The cutting efficiency is 20% -30% higher than that of carbon steel, and the tool life is extended by about 30%; Controlling preheating and post weld heat treatment can ensure welding quality and meet the requirements of complex structural manufacturing.
Production Procedure
Forging,Rough Heat Treatment,Rough Machining,Quenching & Tempering,Surface Treatment,Finish Machining,Inspection and Packaging
Heat Treatment&Surface Treatment
Quenching and Tempering:
Object: Shaft fork, intermediate shaft pipe.
Process: Quenching (840 ° C ± 10 ° C oil cooling)+High temperature tempering (540 ° C ± 10 ° C).
Result: The tempered martensite structure is obtained, and the hardness is usually controlled at HB 260-320 or HRC 28-33, ensuring a match between strength and toughness.
Carburizing&Quenching:
Object: Cross shaft, sliding spline tooth surface.
Process: carburizing at around 930 ° C, followed by quenching and low-temperature tempering.
Result: Surface hardness HRC 58-62, heart hardness HRC 30-45. Surface wear resistance, heart impact resistance.
Intermediate frequency induction hardening:
Object: Spline shaft guide surface.
Result: Localized hardening improves wear resistance.
Surface Treatment
The environment of steel mills is usually accompanied by water, iron oxide scale, and dust, which cause severe corrosion.
Shot Blasting/Sandblasting:
Remove oxide scale and rust, increase coating adhesion.
Primer:
Epoxy Zinc Rich Primer is commonly used to provide cathodic protection and strong rust resistance.
Topcoat:
Polyurethane topcoat or alkyd enamel.
Color: Steel mills usually have specific color codes for management, commonly red, blue, or orange, for visual identification and safety warnings under high temperatures.
Lubrication:
Although not a coating, it is also a part of surface protection. Fill the bearings and spline pairs with EP grease to prevent sintering.
Non destructive testing (NDT)
Ultrasonic testing (UT) and magnetic particle testing (MT) must be performed after heat treatment to ensure no cracks.
