Heavy-Duty 42CrMo Cylindrical Steel Forging Blank for Industrial Equipment.
Heavy-Duty 42CrMo Cylindrical Steel Forging Blank for Industrial Equipment. The Heavy-Duty 42CrMo Cylindrical Steel Forging Blank is a high-strength, hot-forged component specifically designed for use in industrial equipment subjected to extreme mechanical loads. Manufactured from premium 42CrMo alloy steel, this forging blank offers excellent tensile strength, impact resistance, and hardenability—making it ideal for shafts, sleeves, rollers, and other critical rotary or structural parts.
What is it?
The Heavy-Duty 42CrMo Cylindrical Steel Forging Blank is a hot-forged, semi-finished component made from high-strength alloy steel (42CrMo / AISI 4140), specifically engineered for use in large industrial equipment. This cylindrical blank serves as a critical precursor to precision-machined parts such as main shafts, drive axles, and rotary components across heavy-duty applications.
Key Features
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High Strength & Toughness: 42CrMo alloy provides exceptional tensile strength, hardenability, and impact resistance, ideal for dynamic and torsional load conditions.
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Optimized Grain Flow: Forged along the axis to enhance fatigue resistance and structural integrity under high-cycle stress.
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Heat Treatable: Supports quenching and tempering to achieve customized mechanical properties.
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Dimensional Versatility: Available in various diameters and lengths, suitable for 1–6 MW wind turbines and heavy-duty rotary systems.
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Excellent Machinability: Suitable for rough and precision machining, with optional pre-machined features such as center holes and keyways.
Available Types
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Solid Cylindrical Forging Blanks
For general-purpose machining, commonly used as the base for shafts or rollers. -
Pre-Machined Shaft Blanks
With rough-turned surfaces and center holes, designed for easier downstream processing and alignment. -
Long-Length Forged Blanks
Suitable for turbine main shafts and drive shafts exceeding 3000 mm in length. -
Custom Profiled Cylindrical Blanks
Tailored with journals, flanges, or keyways according to OEM design requirements.
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| Item | Details |
|---|---|
| Product Name | Heavy-Duty 42CrMo Cylindrical Steel Forging Blank for Industrial Equipment |
| Material Grades | - Premium alloy steel: 42CrMo / 42CrMo4 / AISI 4140 - Excellent hardenability, impact toughness, and fatigue resistance - Optimized for dynamic load environments in rotating machinery |
| Forging Equipment | - Hydraulic hammers: 5T / 8T / 12T capacity - Open-die forging press for large cylindrical blanks - Enables deep axial forging and consistent grain alignment |
| Manufacturing Process | Hot Forging → Heat Treatment (QT) → Rough / Semi-Finish Machining → Straightness Correction → UT & Dimensional Inspection |
| Forging Ratio | ≥ 3.0 — Ensures refined grain structure and axial fiber flow, enhancing torsional resistance and structural integrity |
| Applications | - Designed for wind turbine main shafts, yaw & pitch shafts, and large transmission shafts - Suitable for high-cycle, heavy-load industrial systems (e.g., 1–6 MW turbines) - Withstands torsional loads, bending stress, and axial vibration over extended service life |
| Heat Treatment Options | - Quenched + Tempered for enhanced strength and toughness - Optional stress relief prior to machining for improved dimensional stability |
| Testing & Inspection | - Chemical: Spectrometer analysis for alloy consistency - Mechanical: Hardness, tensile, yield strength, Charpy impact - Ultrasonic (UT): Full-volume testing - Dimensional: Length, diameter, concentricity, straightness, machining tolerances |
| Value-Added Services | - Custom length & diameter options - Optional pre-machining (center holes, journals, threads, or keyways) - Protective coatings, export-grade packaging (wooden crate, steel banding, end caps) - OEM logo stamping, part number engraving, and traceability documentation available |
| Item | 42CrMo Alloy Steel |
|---|---|
| Steel Grade (GB / ASTM) | 42CrMo / 42CrMo4 (Equivalent to AISI 4140 / SAE 4140) |
| Carbon Content | Approx. 0.38–0.45% |
| Tensile Strength | 850–1100 MPa (after quench & temper) |
| Yield Strength | ≥ 740 MPa |
| Hardness (HBW) | 280–360 (quenched & tempered) |
| Toughness | Excellent toughness and fatigue resistance |
| Machinability | Moderate, machining recommended after heat treatment |
| Heat Treatment Options | Quenched and Tempered (standard for shafts) |
| Typical Applications | Drive Shafts / Couplings,Roll Shafts,Reactor Shaft,Yaw / Pitch Shaft |
| Forging Suitability | Ideal for high-strength, high-fatigue wind turbine shafts |
| Cost | Higher cost due to alloying and processing complexity |
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