25CrMo4 (1.7218) Forging Parts Manufacturer in China

25CrMo4 Forging Parts Basic Information

25CrMo4 (1.7218) is a chromium-molybdenum alloy steel commonly chosen for forged parts that need a balanced combination of strength, toughness and heat-treatment response. This page is for buyers and engineers who need a fast overview before sending an RFQ.

25CrMo4 (1.7218) Alloy Steel Material Overview

Jiangsu Liangyi manufactures custom 25CrMo4 (1.7218) open die forgings, seamless rolled rings and forged parts in Jiangyin, Jiangsu, China. This page focuses on material information, product forms, inspection scope, documentation and quotation guidance for industrial buyers.

25CrMo4 is a chromium-molybdenum alloy steel used for shafts, rings, sleeves, flanges and other high-load parts where strength, toughness and controlled heat treatment are important. Final properties depend on section size, forging ratio, heat treatment route, machining allowance and the project-specific inspection plan.

25CrMo4 (1.7218) Forging Product Shapes

We supply a range of 25CrMo4 forged products and custom geometries for industrial projects that require traceability, controlled heat treatment and drawing-based manufacturing.

25CrMo4 Forged Bars & Transmission Shafts

We manufacture precision 25CrMo4 forged round bars, square bars, flat bars, rectangular bars and rods, as well as custom step shafts, gear shafts, crankshafts, turbine shafts, and rotor shafts, with strict control of size tolerance, material homogeneity, and internal soundness, ideal for different power transmission and heavy structural parts.

1.7218 Seamless Rolled Rings & Flanges

Our 1.7218 seamless rolled rings, gear rings, slewing bearing rings, contoured rolled rings, custom forging rings and flanges are manufactured with advanced ring rolling technology, delivering precise size control, uniform mechanical properties, and refined grain flow, good for high-pressure, high-load rotating and structural uses.

25CrMo4 Hollow Forgings & Sleeves

We produce high-quality 25CrMo4 forged hubs, housings, shells, sleeves, bushes, casings, and thick-walled hollow bars, designed for critical valve, pump, and pressure vessel uses requiring good internal and external surface quality, structural stability, and pressure resistance.

Custom 25CrMo4 Forged Parts

We also manufacture fully custom 25CrMo4 forged discs, blocks, plates, pipe tubes, barrels, die blocks, and other bespoke open die forging parts, fully accordance with AISI 415, EN, ASTM, API, and other international standards, as well as your specific project requirements and technical drawings.

Main Uses for 25CrMo4 (1.7218) Forgings

25CrMo4 forgings are mainly used for demanding service environments where mechanical strength, toughness and reliable material control are important. The following are some industries where 25CrMo4 forging are used but not limited.

Oil & Gas Industry (Onshore & Offshore)

Our 25CrMo4 forgings are often used in global oil and gas projects, including downhole drilling tools, mud motors, hydraulic fracturing pumps, wellhead Christmas trees, blowout preventers (BOPs) and high-pressure valve parts. We supply precision-forged pinion shafts, bull gears, fluid end modules, valve bodies, and casing heads that fully meet API 6A and NACE MR0175 sour service standards.

Nuclear Power Industry

1.7218 steel is well known for its good stable performance in nuclear power facilities, widely used in reactor coolant pumps, reactor internals, trunnions, pressure vessels, and related sealing systems. We supply precision-forged impellers, casings, seal chambers, and other critical safety-related parts that meet the strictest global nuclear industry safety and quality standards.

Marine & Shipbuilding Industry

Our 25CrMo4 forged parts are engineered for harsh marine and offshore environments, used in marine propulsion systems including propeller shafts, rudder stocks, stern shafts, and other critical shipboard parts. All our marine forgings are fully accordance with DNV, LR, ABS, and other major international classification society standards.

Pressure Vessel & Heat Exchanger Industry

25CrMo4 forged parts are ideal for high-temperature and high-pressure uses, including industrial boilers, heat exchangers, pressure vessels, reactors, and process equipment. We supply forged tube sheets, nozzles, channel flanges, shells, and head parts that fully meet ASME, EN, and other global pressure vessel design codes, widely used in power generation, petrochemical, and chemical processing industries worldwide.

General Engineering & Heavy Machinery Industry

We supply precision 1.7218 forged gearboxes, gear wheels, pinion shafts, gear shafts, and ring gears for heavy-duty gear reducers, centrifugal compressors, gas compressors, and decanter centrifuges. We also manufacture custom forged parts for industrial homogenizers, load cells, flow measurement equipment, and mining machinery for global heavy machinery manufacturers.

Valve & Pump Industry

Our 25CrMo4 forged valve and pump parts include precision forged valve balls, valve bodies, valve stems, valve bonnets, pump casings, pump impellers, pump shafts, and seal chambers. These parts are engineered for ball valves, gate valves, check valves, centrifugal pumps, mud pumps, and cryogenic valves, fully accordance with API, EN, ASTM, and other international industry standards.

25CrMo4 Forging Parts Production & Inspection Standards

The following reference materials are helpful in defining the materials, forging, testing and document framework typically required for 25CrMo4 forgings. The final order specifications should always be taken as the standard..

• ISO 643: Steels - Micrographic determination of the apparent ferritic or austenitic grain size
• ISO 4967: Steels - Determination of non-metallic inclusions content via micrographic method
• EN 10083-1/2/3: Steels for quenching and tempering - Technical delivery conditions (European Standard)
• EN 10250-1/2/3: Open die steel forgings for general engineering purposes
• EN 10084: Case hardening steels - Technical delivery conditions
• EN 10204: Metallic products - Types of inspection documents
• EN 10308: Non-destructive testing - Ultrasonic inspection of steel bars
• EN 10228-3: Non-destructive testing of steel forgings - Ultrasonic testing of ferritic/martensitic steel forgings
• ASTM A751: Standard test methods, practices, and terminology for chemical analysis of steel products
• API 6A: Specification for Wellhead and Christmas Tree Equipment (Oil & Gas Industry Standard)

25CrMo4 (1.7218) Steel Chemical Composition

The table below shows reference chemical composition ranges for 25CrMo4 material control (weight %). Final chemistry should follow the purchase specification and agreed standard.

We also strictly control the content of residual and trace elements to ensure the uniformity, long-term performance and stability of the material under the harshest working conditions:

• Aluminium (Al): 0.020 - 0.050%
• Titanium (Ti): ≤ 0.010% (titanium deoxidization strictly prohibited)
• Boron (B): ≤ 0.0010%
• Hydrogen (H₂): ≤ 2 ppm
• Calcium (Ca): < 15 ppm
• Oxygen (O₂): < 25 ppm

Mechanical Properties of Quenched & Tempered 25CrMo4 Forgings

The table below presents reference mechanical properties for quenched and tempered 25CrMo4 forgings at room temperature. Final guaranteed values should match the applicable standard and order requirements.

All finished 25CrMo4 forged parts are delivered with the following strict quality guarantees:

• No banded structure or overheated structure in the finished material
• Minimum grain size index of 5 (per ISO 643 standard)
• Full macro-stress relieving heat treatment for all components
• No harmful internal defects (shrinkage cavities, forging folds, etc.) that may affect mechanical properties
• Uniform material cleanliness throughout the entire part (per ISO 4967 standard)

Full-Process Quality Control & Testing Requirements

We implement batch-by-batch quality control for 25CrMo4 forged parts, with inspection scope defined by delivery condition, drawing requirements and the agreed quality plan.

Inspections for Annealed (+N) or Quenched & Tempered (+QT) Condition

• Full chemical composition analysis via spectrometer
• Residual and trace element content verification
• Tensile test (tensile strength, yield strength, elongation)
• Impact resilience test (3 standard Charpy V-notch specimens)
• Non-metallic inclusion cleanliness inspection
• Delivery condition hardness testing (100% coverage)
• Microstructure and grain size inspection

Inspections for Normalized (+FP) or Case Carburized (+TH) Condition

• Full chemical composition analysis via spectrometer
• Residual and trace element content verification
• JOMINY end-quench hardenability test
• Non-metallic inclusion cleanliness inspection
• Delivery condition hardness testing
• Microstructure and grain size inspection

100% Non-Destructive Ultrasonic Testing

100% ultrasonic testing is performed on every single 25CrMo4 forged bar, ring, and custom parts, in strict accordance with international standards:

• EN 10308: For bars with diameter up to 300 mm
• EN 10228-3: For bars with diameter over 300 mm, and all custom forged parts

Standard acceptance criteria for ultrasonic testing:

• Area between outer diameter (D) and D/2: Class 3 (Class D/c per SEP 1921) with R < 4/5
• Other areas of the part: Class 2 (Class Cc per SEP 1921) with R ≥ 3/4

All ultrasonic testing operations are performed by certified personnel with minimum COFREND Level 2 or equivalent international NDT certification, ensuring test accuracy and reliability. We also offer magnetic particle testing (MT), penetrant testing (PT), and radiographic testing (RT) upon customer request.

Inspection Documentation & Accordance

Inspection documents can be supplied in line with EN 10204 3.1, with EN 10204 3.2 available when specifically required. The documentation package should be defined in the purchase order and inspection plan.

For quotation review, buyers usually share the part drawing, quantity, delivery condition, heat treatment route, machining scope, required NDT, certificate level and delivery destination.This helps to keep the manufacturing route consistent with the actual use.

If you need a technical review before quotation, send the drawing or a basic size sketch together with the target standard and end-use. That information is usually enough to confirm whether open die forging, ring rolling or a machined forging route is the better fit.

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How to Request a Quote for 25CrMo4 Forgings

A complete RFQ improves technical accuracy and reduces unnecessary back-and-forth. If possible, include the following items in your inquiry:

1. Part drawing or a size sketch with main tolerances and machining allowance.
2. Required material name, delivery condition and heat treatment route.
3. Quantity, unit weight, annual demand and requested delivery schedule.
4. Inspection scope such as UT, MT, PT, mechanical testing and certificate level.
5. Destination country, delivery terms and any project-specific approval requirements.

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