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Heavy Duty Ring Gear Internal Ring Gear 4340 Forged Steel Through Hardened Max 2m Diameter
Product Spotlights
4340 forged steel internal ring gear, through hardened for uniform strength, max 2m diameter. Customizable tooth profile, AGMA Q8–Q10 precision. Ideal for heavy mining, wind turbines, and industrial gearboxes. Backed by ISO9001, OHSAS18001 certified manufacturer with 10+ years export experience.
Negotiable
MOQ: 1 Piece (Price negotiable depending on order volume and customization)
Key Specifications
Get Latest Price
Type:
Other, Internal Ring Gear
Material:
4340 Forged Steel
Heat Treatment:
Through Hardened
Payment & Shipping
Payment Methods:
Port of Shipment:
China
Delivery Detail:
Delivery time depends on order quantity.
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Type
Other, Internal Ring Gear
Material
4340 Forged Steel
Heat Treatment
Through Hardened
Max Diameter
2 meters
Application
Heavy Duty Machinery, Mining, Wind Turbines
Hardness
Customizable (upon request)
Surface Finish
Rough or machined (optional)
Gear Module
Customizable (available upon request)
Tooth Profile
Standard or modified (optional)
Henan San Kuang Machinery Technology Co., Ltd. proudly presents our Heavy Duty Ring Gear Internal Ring Gear 4340 Forged Steel Through Hardened, engineered to meet the most demanding industrial applications. With our factory spanning 10,000–30,000 square meters and over a decade of manufacturing excellence since 2014, we deliver ring gears up to 2 meters in diameter that provide unmatched durability and precision. Our 4340 forged steel construction combined with through hardening ensures superior strength, wear resistance, and long service life for heavy equipment in mining, cement, wind energy, and other high-load sectors.
Key Features & Technical Specifications
- Material Excellence: AISI 4340 alloy steel, vacuum-degassed and forged to eliminate internal porosity, offering high toughness and fatigue strength.
- Through Hardening Process: Uniform hardness profile across the entire gear cross-section (typically 28–35 HRC, customizable), reducing risk of core softening under heavy loads.
- Large Diameter Capability: Maximum outer diameter of 2,000 mm, ideal for large-scale gearboxes and slew drives.
- Internal Gear Design: Precision-cut internal teeth with tight tolerances (AGMA Q8–Q10 equivalent) for smooth meshing and low noise.
- Versatile Applications: Suitable for ring gears in mining excavators, tunnel boring machines, wind turbine pitch/yaw systems, and heavy press equipment.
- Customization Options: We offer tailored tooth modules, pressure angles, and surface finishes (rough turned, machined, or ground) per your engineering drawings.
Strict Quality Control
| Inspection Item | Method | Standard |
| Chemical Composition | Spectrometer Analysis | ASTM A322 / AISI 4340 |
| Hardness | Rockwell C (surface & core) | 28–35 HRC (custom range) |
| Ultrasonic Testing | ASTM E114 | No internal defects > 2mm |
| Gear Tooth Accuracy | Coordinate Measuring Machine | AGMA Q8–Q10 or equivalent |
Advantages Over Conventional Cast or Normalized Gears
- Higher Load Capacity: Forged 4340 steel delivers up to 30% greater fatigue strength than cast iron or low-carbon alternatives.
- Through Hardened Uniformity: Eliminates soft core failure modes common in case-hardened gears, ideal for shock loads.
- Longer Service Life: Rigorous testing via our ISO9001, ISO14000, OHSAS18001 certified processes ensures consistent reliability.
- Cost-Effective for Large Orders: Our Luoyang factory leverages advanced forging presses and CNC gear cutters to reduce per-unit cost while maintaining precision.
Trusted by Global Industries
Since 2014, Henan San Kuang Machinery Technology Co., Ltd. has exported to North America, South America, Europe, Southeast Asia, Africa, Oceania, and the Middle East with an annual export value between US$2.5 Million and US$5 Million. Our 51–100 skilled employees operate from a 10,000–30,000 m² facility, backed by certifications including HACCP, TL900, QS9000, SA8000, ISO9001, ISO9004, ISO17799, ISO14000, ISO10441, ISO16949, TS16969, ISO19011:2000, OHSAS18001, and others. Each ring gear is shipped from major Chinese ports (Shanghai, Lianyungang, Qingdao, Tianjin) with full traceability documentation. We invite you to request a quote or engineering consultation for your next heavy-duty gear project — our team is ready to support your specific requirements.
Frequently Asked Questions (FAQ)
-
Q: What is the maximum outer diameter you can produce?
A: Our maximum outer diameter for ring gears is 2,000 mm (2 meters). Larger diameters may be possible upon request with special tooling arrangements. -
Q: Can you supply ring gears with customized internal tooth profiles?
A: Yes, we can manufacture internal gear teeth with various modules, pressure angles, and addendum modifications according to your engineering drawings or performance requirements. -
Q: What hardness range do you typically achieve after through hardening?
A: Standard through hardening yields a hardness range of 28–35 HRC. We can adjust the tempering process to achieve other specified ranges (e.g., 32–38 HRC) based on application needs. -
Q: Do you provide material certificates and inspection reports?
A: Absolutely. Each batch is supplied with chemical composition analysis, ultrasonic test reports, and hardness test records. Additional NDT (magnetic particle, dye penetrant) is available as an option. -
Q: How do you ensure the roundness and concentricity of large ring gears?
A: We use precision CNC gear hobbing and grinding machines plus coordinate measurement to maintain roundness within 0.05 mm and concentricity within 0.08 mm for diameters up to 2 m. -
Q: What is the typical lead time for a custom internal ring gear?
A: Lead time depends on complexity and quantity. Standard single-piece orders range from 4 to 8 weeks. Please contact our sales team for an accurate schedule. -
Q: Can you handle urgent or small quantities?
A: Yes, we offer flexible production runs. For small quantities (1–10 pieces), we can schedule rush manufacturing with a surcharge. Contact us for details. -
Q: What payment terms do you accept?
A: We accept T/T, L/C, and other negotiable terms. For first-time orders, 30% deposit and 70% balance before shipment is typical.
Contact us today for a detailed quotation or technical discussion — let our forged steel ring gear strengthen your equipment.
Send Inquiry to This Supplier
1Yr
Year Established
2014
Factory Size
10,000-30,000 square meters
Annual Export Value
US$2.5 Million - US$5 Million
Total Employees
51 - 100 People
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