Custom Mill Trunnion Forgings China Suppliers | Heavy Duty Shaft Factory

Leading China factory and suppliers of high-strength mill trunnion forgings. Engineered for SAG and ball mills with superior grain flow and UT 100 inspection for maximum load capacity.

SupplierYongxin Sheng Heavy Industry International Co., Ltdwww.yxs-forging.com

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Our Mill Trunnion Forgings are engineered specifically for high-stress trunnion positions within ball mills, SAG mills, and heavy-duty rotary processing equipment. By integrating shaft-like structural integrity with hollow-section characteristics, these forgings are designed to withstand extreme operating loads in demanding mineral-processing and heavy-industry environments. The optimized forging route ensures a robust preform, providing a superior foundation for precision machining of bearing areas, bores, and critical sealing surfaces.

To minimize structural risk and maximize equipment longevity, we focus on precise section transition, heat-treatment compatibility, and generous dimensional allowances. Whether your project requires strict straightness control or specific stock in journals and tapers, our forging process is tailored to the machining sequence. We offer comprehensive value-added services including rough machining, 100% ultrasonic testing, and rigorous mechanical property verification to ensure every component meets the strictest global inspection standards.

Detailed Parameters

Key Features	Hollow shaft structure, large-diameter thin-wall control, support face accuracy, wear resistance	Typical Materials	42CrMo4, 34CrNiMo6, or according to customer drawing
Outer Diameter (OD)	800mm ~ 3000mm	Length Range	1000mm ~ 4000mm
Max Unit Weight	≤ 80 tons	Typical Applications	Ball mill trunnions, SAG mill trunnions, rotary kiln support shafts
Supply Condition	Quenched & Tempered / Rough machined (ID/OD + flange faces)	Inspection Standard	UT 100%, Wall thickness/concentricity report
Documentation	Mechanical properties report, EN 10204 3.1 Certification	Processing Capability	Custom forging, heat treatment, rough machining

Key Advantages

Structural Integrity

Optimized forging routes eliminate internal defects, ensuring maximum strength for heavy-load bearing applications.

Wear Resistance

Utilizing premium alloys like 34CrNiMo6 to extend the service life of trunnions in abrasive environments.

Precision Control

Strict control over large-diameter thin-wall thickness and concentricity for seamless assembly.

Heat Treatment

Professional quenching and tempering processes to achieve ideal hardness and toughness balance.

Quality Assurance

100% Ultrasonic Testing (UT) and EN 10204 3.1 certification for guaranteed internal quality.

Machining Ready

Rough machined surfaces on ID/OD and flanges to reduce customer processing time and cost.

Product Gallery

Management Platforms

Material Sourcing

Rigorous selection of certified alloy steels to ensure consistent mechanical properties.

Forging Process

Advanced forging routes designed to optimize grain flow and structural stability.

Thermal Control

Precision-controlled quenching and tempering cycles for uniform hardness.

NDT Inspection

Comprehensive Ultrasonic Testing and magnetic particle inspection for zero-defect delivery.

Machining Logic

Strategic rough machining to provide ideal allowances for final precision finishing.

Compliance Tracking

Full traceability with detailed material certifications and inspection reports (EN 10204).

Investment Return Comparison

Feature	Standard Castings	Our Forged Trunnions
Internal Density	Potential Porosity	Full Density / Grain Flow
Fatigue Life	Moderate	Excellent / High Load Capacity
Machining Stability	Variable	High Dimensional Stability
Safety Factor	Standard	Enhanced / Low Structural Risk
Maintenance Cycle	Frequent Inspections	Extended Service Intervals

Frequently Asked Questions

Q: What materials are most suitable for Mill Trunnion Forgings?

Depending on the load and environment, we typically use high-strength alloy steels such as 42CrMo4 or 34CrNiMo6. We also customize materials based on specific customer engineering drawings to meet exact hardness and tensile requirements.

Q: How do you ensure the internal quality of large-diameter forgings?

We implement 100% Ultrasonic Testing (UT) across the entire volume of the forging to detect any internal discontinuities. This is supplemented by a detailed concentricity and wall thickness report to ensure geometric integrity.

Q: Can you provide rough machining for trunnion components?

Yes, we provide rough machining on the inner diameter (ID), outer diameter (OD), and flange faces. This allows our customers to proceed directly to final precision machining with reduced risk and lower operational costs.

Q: What is the maximum weight capacity for your forged shafts?

Our current production capacity for mill trunnion forgings supports unit weights up to 80 tons, with outer diameters ranging from 800mm to 3000mm.

Q: Which certifications are provided with the shipment?

All shipments are accompanied by EN 10204 3.1 certification, which includes detailed heat treatment records, mechanical property verification, and NDT inspection reports.

Q: Why choose forged trunnions over cast alternatives?

Forging creates a continuous grain flow that follows the contour of the part, significantly increasing fatigue strength and impact resistance compared to casting, which is critical for the heavy loads found in SAG and Ball mills.