Large ring components are manufactured using special forging and heat treatment processes, involving multiple steps. Ring structures are formed through processes such as ring rolling, resulting in high strength, high wear resistance, and excellent fatigue resistance. They feature high dimensional accuracy and are customizable.

Manufacturing Process

(1) Material Selection

A wide variety of materials are used in the manufacturing of large ring components, including carbon steel, alloy steel, stainless steel, high-temperature alloys, and some non-ferrous metal alloys. The specific material selection depends on the application scenario and performance requirements of the ring component. For example, in general industrial environments, carbon steel is widely used due to its low cost and acceptable overall performance; in extreme conditions such as high temperature, high pressure, or strong corrosion, stainless steel is preferred for its excellent corrosion resistance; for fields such as aerospace and energy, where material performance requirements are extremely stringent, high-temperature alloys and high-strength alloy steels are favored for their superior high-temperature strength, fatigue resistance, etc. For example, in the nuclear power field, the reactor vessel support ring needs to withstand enormous weight and maintain stability during long-term operation. The reactor vessel support ring created by Taiyuan Iron & Steel (TISCO) for China's fourth-generation nuclear power unit, the 600,000-kilowatt sodium-cooled fast neutron breeder reactor demonstration reactor No. 2 in Xiapu, Fujian, uses 316H high-purity stainless steel continuous casting billets as raw materials. This material meets the extremely high requirements for quality and performance of the support ring under complex operating conditions.

(2) Heating Stage

Heating the carefully selected metal billets to a specific temperature range is one of the key steps in the manufacturing of large ring components. Typically, the heating temperature of the billets is between 1100°C and 1250°C, with the specific temperature adjusted precisely according to the material type and forging process requirements. A suitable heating temperature significantly improves the plasticity of the metal billets, making them easier to undergo plastic deformation during subsequent forging, laying the foundation for obtaining the desired ring shape and internal structure. Heating equipment mainly includes single-chamber furnaces, push-rod furnaces, and bench-top annealing furnaces, and mostly uses natural gas as fuel to ensure the efficiency and stability of the heating process.

(3) Forging and Shaping

Ring Rolling Process: Ring rolling machines play a core role in the forging of large ring components. Through the ring rolling process, the ring billet undergoes continuous local plastic deformation under the action of the equipment, achieving a reduction in wall thickness, an increase in diameter, and precise shaping of the cross-sectional profile. This process has many significant advantages, such as low equipment tonnage requirements but a large processing range. Because the contact area between the workpiece and the die is small, the deformation force is correspondingly reduced, allowing the forging of large ring components to be completed on equipment with relatively small tonnage; high material utilization rate, the cross-sectional shape of the rolled ring is closer to the finished product, and the machining allowance is greatly reduced; excellent product quality, the rolling process makes the metal fibers continuously distributed along the circumferential direction, matching the stress and wear conditions of the actual use of the ring, and in most cases, the internal structure is dense, the grains are fine, and the comprehensive mechanical properties far exceed those of ring components manufactured by other processing methods. The largest D53K-12000 ring rolling machine in China can roll ring components weighing up to 50 tons, with a maximum outer diameter of 12000mm, fully demonstrating the powerful capabilities of the ring rolling process in the manufacturing of large ring components.

Other Forging Auxiliary Processes: In actual production, in addition to the ring rolling process, auxiliary processes such as upsetting, punching, and expanding are also combined. Upsetting increases the height of the billet and improves the uniformity of its internal structure; punching creates conditions for subsequent expanding and ring rolling; expanding gradually expands the inner diameter of the ring component to meet the design size requirements. These processes work together to ensure that large ring components can be precisely formed.

(4) Heat Treatment Strengthening

Forged large ring components undergo rigorous heat treatment processes to further enhance their performance. Common heat treatment methods include annealing, normalizing, quenching, and tempering, each with its specific purpose and applicable range. Annealing and normalizing effectively eliminate residual stresses within the ring component, optimize the organizational state, reduce hardness, and improve the material's plasticity and toughness; quenching and tempering significantly improve the ring component's hardness, strength, and wear resistance. By precisely controlling the temperature, time, and other parameters of quenching and tempering, the ring component can achieve performance indicators that meet the needs of different application scenarios. For example, for large ring components that withstand high loads and high wear, appropriate quenching and tempering treatment can greatly enhance their service life and reliability.

(5) Mechanical Machining Refinement

Advanced mechanical machining equipment and processes, such as turning, grinding, and milling, are used to precisely machine large ring components to ensure that their dimensional accuracy, surface roughness, etc., strictly meet the design requirements. For some large ring components used in high-end fields with extremely high precision requirements, precision machining equipment and special processing techniques are also required. For example, in the wind power field, the concentricity requirement of 6MW and above wind turbine hub machining is ≤0.02mm, and such stringent precision standards can only be met through high-precision mechanical machining. During mechanical machining, digital control technology is used to precisely control the tool's movement trajectory and machining parameters, ensuring that the various dimensional tolerances of the ring component are controlled within a very small range.

(6) Surface Treatment and Protection

To enhance the corrosion resistance and aesthetics of large ring components, surface treatment is usually performed. Common surface treatment methods include galvanizing, chrome plating, and spraying anti-corrosion coatings. Galvanizing forms a dense zinc layer on the surface of the ring component, effectively isolating external corrosive media and preventing metal rust; chrome plating improves the surface hardness and gloss of the ring component, enhancing its wear resistance and decorativeness; spraying anti-corrosion coatings selects appropriate coatings based on different usage environments and needs, forming a coating with good protective performance to extend the service life of the ring component. In harsh corrosive environments such as marine engineering, surface-treated large ring components can better withstand seawater erosion and ensure the long-term stable operation of the equipment.

Product Features

(1) High Strength and High Toughness

Through special forging and heat treatment processes, large ring components have a dense internal structure, refined grains, and uniform distribution, resulting in excellent high strength and high toughness. When subjected to large loads and complex stresses, they can maintain structural integrity and are not easily fractured or deformed. Taking the ring-shaped components of engines in the aerospace field as an example, under the enormous centrifugal force and high-temperature environment generated by the high-speed operation of the engine, large ring components need to withstand extremely high stress, and their high strength and high toughness characteristics ensure the safe and reliable operation of the engine.

(2) Good Wear Resistance

After undergoing a specific processing, the surface hardness of large rings is significantly improved. Under high load, high speed, and frictional wear conditions, it exhibits good wear resistance. This characteristic allows the ring to effectively reduce surface wear during long-term use, maintaining dimensional accuracy and stable performance, extending the service life of the ring, and reducing equipment maintenance costs. In the fields of mining machinery and engineering machinery, large rings frequently withstand heavy loads and friction, and good wear resistance is a key factor in ensuring the continuous and efficient operation of equipment.

Excellent Fatigue Resistance

Since large rings often bear alternating loads in actual work, fatigue resistance is one of its important performance indicators. Forging optimizes the internal microstructure of the metal material, giving it excellent fatigue resistance, effectively resisting the generation and expansion of fatigue cracks, and avoiding equipment failures caused by fatigue failure. In energy industry equipment such as steam turbines and generators, large rings need to operate under alternating stress for a long time, and their excellent fatigue resistance ensures stable operation and long-life service of the equipment.

High Dimensional Accuracy ​

Advanced manufacturing equipment and a strict quality control system ensure that large rings have extremely high dimensional accuracy. Whether it is the outer diameter, inner diameter, or thickness, the tolerances can be strictly controlled within the specified range, meeting the high-precision assembly requirements of different equipment. In nuclear power equipment, the planarity of the reactor pressure vessel flange needs to reach the ISO 2768 - mK level. Such high-precision requirements can only be achieved through precision manufacturing processes and strict testing methods, ensuring the sealing performance and overall safety of the pressure vessel.

High Degree of Customization

According to customer's diverse needs, from material selection and design and development to production and manufacturing, we provide customers with comprehensive customized services. Whether it is ultra-large heavy rings or precision rings with special shapes and performance requirements, they can be customized through professional technical teams and advanced production equipment. For example, China Aviation Excellence Forging successfully rolled a super-large valve body titanium alloy high-cylinder inner and outer irregular ring forging with an outer diameter of 2203 mm, an inner diameter of 1690 mm, a height of 810 mm, and a weight of 4.7 tons, meeting the needs of special equipment in the petrochemical field and filling the gap in domestic related technologies.

Product Specifications and Customized Services

Large rings have a wide range of specifications, with inner diameters ranging from hundreds of millimeters to several meters, outer diameters also having a wide range, and thicknesses can be flexibly customized according to actual needs. According to the detailed drawings, samples, or specific technical requirements provided by customers, we can deeply participate from the initial design stage of the project to customize the most suitable large ring solutions for customers. The professional technical team has rich experience and advanced design software, and can use finite element analysis and other methods to optimize the structure and performance of the rings, ensuring that the customized large rings meet customer's usage requirements while having the best cost performance. During production, we strictly follow the customized plan and quality standards, and use advanced manufacturing processes and equipment to ensure high-quality product delivery. At the same time, we also provide perfect after-sales service, promptly responding to problems encountered by customers during use, and providing customers with comprehensive support.

Application Areas

Wind Power Industry	Shipbuilding	Mechanical Manufacturing
Nuclear Power Industry	Oilfield Industry	Chemical Industry