About Our 18CrMo4 (1.7243) Forging Solutions
Established in 1997, Jiangsu Liangyi Co.,Limited is a professional ISO 9001:2015 certified China manufacturer and supplier of precision 18CrMo4 (1.7243) open die forging parts and seamless rolled steel forged rings. Our advanced manufacturing facility is located in Jiangsu Province, China, covers an area of 80,000㎡ with fixed assets up to 40 million USD, and an annual manufacturing capacity of 120,000 tons.
We provide a one-stop custom manufacturing solution from steel melting, precision forging, controlled heat treatment to final CNC machining, strictly manufactured per your 2D/3D drawings and technical manuals. Our high-quality 18CrMo4 (1.7243) forged parts are widely exported to more than 50 countries across Europe, North America, the Middle East, Australia and Southeast Asia, serving global clients in heavy industrial sectors.
Full In-House Production
Complete control from steel melting to finished machining
Custom Size Range
Forging weight from 30KGS to 30,000KGS, fully custom specifications
Strict Quality Control
Full inspection system with complete MTC 3.1/3.2 certification
Global Export Expertise
25+ years of experience serving industrial clients worldwide
Full Range of 18CrMo4 (1.7243) Forged Steel Products
We manufacture a full range of 18CrMo4 (1.7243) forging products in different shapes and custom specifications, fully in accordance with EN 10084 and other international standards. Our main product lines include:
Forged Bars & Solid Rods
Precision 18CrMo4 forged round bars, square bars, flat bars, rectangular bars and solid rods, available in custom sizes and lengths to meet your project requirements. We also supply precision step shafts and blank bars for subsequent machining.
Seamless Rolled Forged Rings
High-quality 1.7243 seamless rolled forged rings, flanges, riding gear rings, slewing bearing races and contoured rolled rings. Our advanced rolling equipment can produce rings with a maximum outer diameter of 5 meters, with good structural uniformity and fatigue resistance.
Forging Shafts & Gear Parts
Heavy-duty 18CrMo4 forged gear shafts, pinion shafts, spindles, gears, crankshafts, eccentric shafts and other precision transmission parts. These products are widely used in high-load power transmission systems and have good hardening performance and wear resistance.
Forged Housings, Sleeves & Hollow Parts
Custom 1.7243 forged hubs, housings, shells, sleeves, bushes, casings, hollow bars, pipes and barrels, with precise machining tolerances and strict non-destructive testing. We manufacture custom hollow forgings to your exact drawing specifications.
Custom Forged Shapes & Parts
We also manufacture custom 18CrMo4 forged discs, blocks, plates, flanges, cylinders and other special-shaped forgings according to your 2D/3D drawings or samples. All custom products are manufactured with strict quality control through the entire production process. See our full alloy steel material range for more options.
18CrMo4 Forging Parts Uses & Global Cases
As a high-tensile, ductile case hardening steel, 18CrMo4 (1.7243) is the ideal material for parts subject to high pressure, heavy impact and dynamic varying loads. Our 18CrMo4 forging parts are widely used in the following core industries:
Wind Power Industry
We supply precision 18CrMo4 forged gear shafts, ring gears and other core parts for wind turbine gearboxes, fully in accordance with EN 10084 standard.
Mining & Engineering Machinery Industry
Our heavy-duty 1.7243 forging parts are widely used for mining excavator slewing bearing races, gyrators crusher eccentric shafts, crusher belt pulley wheels, electric shovel parts and other heavy-duty mining equipment parts.
Cement & Building Materials Industry
We provide heavy-duty 18CrMo4 forged pinion shafts, riding gear rings, pull torque rods, rotary kiln parts and dryer trunnion wheels for large cement mills and production lines.
Oil & Gas Drilling Industry
Our high-strength 18CrMo4 forged gear shafts, pinion shafts, box riser joints and other parts are widely used in onshore and offshore oil drilling rigs, mud pumps, subsea drilling equipment and other oilfield tools.
Rail Transit & Locomotive Industry
We supply precision 1.7243 forged transmission shafts, traction motor end housings, rear end shields and other parts for railway locomotives and urban rail transit vehicles.
Other Main Industries
Our 18CrMo4 forging parts are also widely used in gearboxes & reducers, gas compressors, mechanical presses, pumps, hydro turbines, cranes, shipbuilding, conveyor systems, hydraulic cylinders, sugar mills and other heavy industries. See our full project references for more details.
18CrMo4 (1.7243) Material Specifications & Production Standards
18CrMo4 (material No. 1.7243) is a widely used European standard low alloy quenched steel defined in EN 10084. It is engineered for uses subject to high pressure and dynamic varying loads, mainly chosen for parts with sizes up to 155mm. It is the ideal material for steel rollers, bit cutters, bushings, pinions, gear wheels and drill bit inserts. The steel can be safely welded before carburizing after proper preheating.
International Production Standards
Our 18CrMo4 forged parts are manufactured in strict accordance with international standards, including:
- EN 10084: 2008 Case hardening steels. Technical delivery conditions
- EN 10263-3: 2001 Steel rod, bars and wire for cold heading and cold extrusion. Technical delivery conditions for case hardening steels
- EN 10250-3: 2000 Open steel die forgings for general engineering purposes. Alloy special steels
- ISO 6336-5 / DIN 3990-5 Gear material quality standards
Strict Steel Melting Requirements
To ensure the highest material purity and mechanical performance, our 18CrMo4 steel follows strict melting and refining requirements:
- Electric arc furnace or blast furnace + oxygen blast converter melting, with subsequent ladle refining treatment
- Full vacuum degassing treatment to reduce internal porosity and improve material purity
- Non-radioactive material, fully meeting global environmental and safety requirements
- Calcium addition for deoxidization is strictly prohibited before vacuum degassing
- Trace calcium addition (maximum 15 ppm) allowed after vacuum degassing to improve casting quality
- Material quality class reaches at least MQ level according to ISO 6336-5
- Full accordance with all EN 10084 standard requirements
18CrMo4 (1.7243) Steel Chemical Composition
The chemical composition of our 18CrMo4 (1.7243) steel is strictly controlled within the EN 10084 standard ranges:
| Element | Content Range (Weight %) |
|---|---|
| Iron (Fe) | 96.8 - 98.2 |
| Chromium (Cr) | 0.9 - 1.2 |
| Manganese (Mn) | 0.6 - 0.9 |
| Silicon (Si) | 0 - 0.4 |
| Molybdenum (Mo) | 0.15 - 0.25 |
| Carbon (C) | 0.15 - 0.21 |
| Copper (Cu) | 0 - 0.25 |
| Phosphorus (P) | 0 - 0.035 |
| Sulfur (S) | 0 - 0.035 |
18CrMo4 Mechanical Properties & Heat Treatment Specifications
Mechanical Properties of 18CrMo4 Raw Material (+QT Condition)
| Mechanical Property | Nominal Thickness | Standard Value |
|---|---|---|
| Tensile Strength (Rm) | ≤ 16 mm | 1100 MPa |
| Tensile Strength (Rm) | ≤ 160 mm | 485 - 660 MPa |
| Min. Elongation at Fracture (A) | ≤ 160 mm | 20% |
| Impact Energy (KV) | ≤ 160 mm, +20℃ | 50 J |
Standard Heat Treatment Specifications
We provide standard and custom heat treatment for 18CrMo4 forged parts according to your requirements:
- Normalizing: 870 – 900°C, cooling in air
- Soft Annealing: 680 – 700°C, cooling in furnace
- Carburizing: 880 - 980°C
- Core-hardening: 860 - 900°C, oil-polymer salt bath quenching
- Case-hardening: 780 - 820°C, oil-polymer salt bath quenching
- Carbonitriding: 860 - 950°C
- Tempering: 150 - 200°C
Full-Process Quality Control & Inspection for 18CrMo4 Forgings
We implement full-process quality control for all our 18CrMo4 (1.7243) forging parts, with comprehensive advanced inspection equipment and strict testing standards. All products are 100% inspected before delivery, with a mill test certificate (MTC) provided with every shipment.
Chemical Composition Inspection
- Optical emission spectrometer ARL 3460
- Portable spectrometer SPECTROPORT F
- Portable X-Ray spectrometers NITON XLT 898
- Leco instruments for precise determination of C, S, O, N, H content
Metallographic & Microstructure Inspection
- High-precision optical microscope with digital image management system
- Professional specimen polishing equipment
- LSP micrography equipment with repetition function
- Portable microscope type SM 500
Non-Destructive Testing (NDT)
- Magnetic particle examination (MT)
- Dye penetrant examination (PT)
- Manual & automated ultrasonic examination (UT)
- Full visual and size inspection
- Hardness measurement (ERNST/EQUOTIP) HB10/3000/15
- Residual stress determination (ASTM E 837)
- Radioactivity measurement
- Heat stability testing
Mechanical & Technological Properties Testing
- Universal testing machines GALDABINI 40 MN – INSTRON 60 MN (ISO and ASME accordance)
- Low-temperature impact testing machines up to -196°C
- High-temperature testing equipment up to 600°C
- Drop weight test machine
- Stress rupture testing machine
- High-precision profile measurer
- Full range hardness testers & portable digital gauges
- Simulated heat treatment of test specimens
Frequently Asked Questions About 18CrMo4 (1.7243) Forging Parts
18CrMo4 (material No. 1.7243) is a low alloy quenched steel in accordance with European standards, as defined in EN10084. It offers good harden ability, high tensile strength, great toughness and great wear resistance after carburizing and quenching, making it ideal for heavy-duty mechanical parts in industrial uses.
18CrMo4 is equivalent to AISI 5120 in the US standard, 20CrMo in Chinese GB standard, and SCM420 in Japanese JIS standard. It is most commonly referred to by its material number 1.7243 in European markets.
We manufacture 18CrMo4 forging parts with a weight range from 30KGS up to 30,000KGS. For seamless rolled rings, we can produce parts with a maximum outer diameter of 5 meters. All custom sizes and specifications are available based on your technical drawings.
Yes, we mainly produce custom forging parts. We produce 18CrMo4 forging parts strictly in accordance with your 2D/3D drawings, technical requirements, and specified international standards. Our in-house engineering team provides professional optimization suggestions to improve production efficiency and reduce the costs for your project.
We provide EN 10204 3.1 Mill Test Certificates (MTC) for all 18CrMo4 forging parts as standard. EN 10204 3.2 certificates issued by third-party inspection agencies are also available upon request. We are ISO 9001:2015 certified, and can comply with API, CE, and other international industry standards as required.
How to Apply for a Customized Quotation for 18CrMo4 forgings
To shorten the quotation time and reduce technical repetitions, please prepare the following information when sending the inquiry.
- Send the part drawing, sketch, or main sizes.
- Confirm the material grade: 18CrMo4/1.7243. If necessary, confirm any equivalent references.
- Describe the weight of the forging, the annual quantity and whether processing is required.
- State required heat treatment, hardness or case-hardening expectations.
- Tell us the inspection level, certificate requirement and destination.
Contact Us for Custom 18CrMo4 Forging Solutions
Welcome to contact us for your custom 18CrMo4 (1.7243) forging parts requirements. As a professional China forging manufacturer with 25+ years of experience, we will provide you with high-quality products, competitive prices and professional one-stop technical support.
Get a Free Custom Quote- Inquiry Email: sales@jnmtforgedparts.com
- Phone/WhatsApp: +86-13585067993
- Official Website: https://www.jnmtforgedparts.com
- Factory Address: Chengchang Industry Park, Jiangyin City, Jiangsu Province, China