Rolled Ring Forgings: Manufacturing, Applications, and Global Supply from Iraeta

Rolled ring forgings are seamless annular components produced by hot forging and rolling, offering superior grain flow, strength, and reliability. Iraeta Energy Equipment Co., Ltd., established in 2006, is a Chinese manufacturer headquartered in Jinan, China, with over 50 years of forging experience and more than three decades serving global markets. Iraeta operates 10 production facilities in China and Spain, and its R&D team consists of 100 engineers. The company produces rolled ring forgings ranging from 0.3 kg to 300 tons, including seamless rings up to 22 meters in diameter, 5 meters in height, and 300 tons in weight. In 2022, Iraeta set a Guinness World Record by producing the world’s largest seamless forged ring—15.7 meters in diameter and 49.2 meters in circumference. This article covers the capabilities, applications, and sourcing of rolled ring forgings from Iraeta.

What Are Rolled Ring Forgings?

Rolled ring forgings are large, heavy forgings that are also classified as ring forgings, shell forgings, hollow forgings, and in some cases profiling rolled forgings. They are produced by heating a metal billet, piercing it to form a hollow preform, and then rolling it on a ring rolling mill to achieve the desired diameter and cross-section. This process creates a seamless structure without welding, resulting in higher mechanical strength and better fatigue resistance compared to welded rings. Iraeta’s rolled ring forgings are made from carbon steel, stainless steel, or alloy steel, and are available as seamless rolled ring forgings, profiling rolled ring forgings, large rolled ring forgings, and heavy rolled ring forgings.

Industry Applications and Working Conditions

Iraeta’s rolled ring forgings serve critical roles in multiple industries, including wind power, hydropower, nuclear power, offshore engineering, petrochemicals, high-end equipment, construction machinery, and rotary kilns.

Wind Power

For offshore wind farms, rolled ring forgings provide critical load-bearing connections, torque transmission, and structural stability. Components operate 24/7 under high cyclic loads, salt spray, and marine corrosion, requiring high structural strength, excellent corrosion resistance, low temperature toughness, and high fatigue life. Supporting equipment includes wind turbine towers. This scenario is common in Germany.

Hydropower

In hydropower applications (pumped storage stations and hydro turbine units), rolled ring forgings transfer loads and provide structural support under high water head pressure and sediment abrasion. They operate with frequent start-stop cycles and require high water pressure resistance, fatigue resistance, and long service life. Supporting equipment includes hydraulic turbines and generators.

Offshore Engineering

Offshore drilling platforms, marine engineering, and deep-sea equipment demand deep-sea pressure resistance, marine-grade corrosion protection, and anti-fatigue under cyclic loads. Rolled ring forgings provide load transfer, structural connection, bearing support, sealing positioning, and tail shaft protection. This application is common in France, Italy, the United States, the United Kingdom, the Netherlands, Norway, South Korea, Japan, and Brazil.

Petrochemical

In pressure vessels and piping systems, rolled ring forgings must withstand high pressure, high temperature, and corrosive environments. They provide pressure containment and structural support, operating in continuous 24/7 mode. Special requirements include corrosion-resistant and high-strength materials.

Construction Machinery

For shield machines, cranes, and slewing systems, rolled ring forgings handle heavy loads, vibration, frequent start-stops, and variable loads. They provide load bearing, torque transmission, and slewing support in intermittent heavy-duty operation.

Rotary Kilns

Rotary kiln components (kiln tyres, drive rings, support rollers) experience extreme high temperature, heavy cyclic loads, and continuous 24/7 operation. Rolled ring forgings offer load bearing, torque transmission, structural support, and vibration damping. These are used in cement production and other thermal processing industries in Germany, Japan, and the United States.

Key Capabilities and Specifications

Iraeta produces a wide range of rolled ring forgings with the following maximum dimensions:

• Maximum outer diameter: 22 meters
• Maximum height: 5 meters
• Maximum weight: 300 tons

Available materials include carbon steel, stainless steel, and alloy steel. Iraeta’s main products related to rolled ring forgings include Shells, Transition Sections, Profiling Rings, Hydroelectric Forgings, Kiln Tyres, Drive Rings, Wind Power Flanges, Gearbox Forgings, Bearing Rings, Forged Shafts, Pipe Flanges, Precision Machining, and Grinding Balls. The company’s production facilities in China and Spain are equipped to handle both standard and custom orders.

Comparison of Application Requirements

Frequently Asked Questions

Conclusion

Rolled ring forgings from Iraeta deliver the strength, precision, and durability required for demanding applications in wind power, hydropower, offshore engineering, petrochemical, construction machinery, and rotary kiln industries. With a maximum capacity of 22-meter diameter rings, 300-ton weight, and a broad material selection, Iraeta is a capable partner for both standard and custom projects. Backed by 50+ years of forging experience, 10 production facilities, and a 100-engineer R&D team, Iraeta provides end-to-end solutions from material preparation to global delivery. For inquiries, contact Iraeta at ebiz@iraeta.com or +86-188-5315-7508.