17NiCrMo6-4 (1.6566) Forging Parts | EN 10084 Standard | China Jiangsu Professional Manufacturer

About 17NiCrMo6-4 (1.6566) Forging Material (EN 10084)

Jiangsu Liangyi Co.,Limited is an ISO 9001:2015 certified professional manufacturer located in Jiangyin, Jiangsu, China. Our main products include 17NiCrMo6-4 (also known as 1.6566, 17NiCrMo6.4, 17NiCrMo64) open die forging parts and seamless rolled steel forged rings. Established in 1997, we have more than 27 years of professional forging experience and have supplied custom 17NiCrMo6-4 forged parts to industrial customers in more than 50 countries around the world, including Germany, the United States, Saudi Arabia, Australia, Brazil, and South Africa.

17NiCrMo6-4 is a premium low-carbon case hardening steel that meets the EN 10084 European standard. It is made with a minimum of 0.8% chromium, 1.2% nickel and 0.15% molybdenum. As one of the most widely used case hardening steels in heavy industry around the world, it has excellent medium-high hardenability, great machinability, and excellent dimensional stability during heat treatment. After standard case carburizing, quenching and tempering, the material has a surface hardness of 58-62 HRC and a high-toughness core , which means it has excellent wear resistance and can work well in heavy shock loads, impact forces ,variable load conditions, even in low-temperature operating environments.

All our forged 17NiCrMo6-4 material is melted in 30-ton ultra-high power electric arc furnaces (EAF), refined with advanced ladle metallurgy (LF), and processed with vacuum degassing (VD) and vacuum oxygen decarburization (VOD) processes to make sure it has great steel cleanliness, consistent microstructure, and minimal non-metallic inclusions. Electroslag remelting (ESR) is also available based on clients' specific technical requirements. We provide full EN 10204 3.1 Mill Test Certificates (MTC) for every delivery, with full material traceability from melting to finished machining. EN 10204 3.2 certification by third-party inspection bodies (BV, SGS, TUV) is available upon request.

Available 17NiCrMo6-4 (1.6566) Forged Product Forms

We supply a full range of custom 17NiCrMo6-4 (1.6566) forged products in different shapes, sizes and specifications. All parts are made based on EN 10084, ASTM, API, DIN international standards and client technical drawings. Following are our available product forms:

• 17NiCrMo6-4 forged steel round bars, square bars, flat bars, rectangular bars, hollow bars and rods
• 1.6566 seamless rolled rings, open die forged rings, contoured rolled rings, gear rings and slewing bearing rings (max diameter up to 6 meters)
• 17NiCrMo6-4 forged hubs, housings, shells, sleeves, bushes, casings, blocks and valve bodies
• 1.6566 forged gear shafts, pinion shafts, step shafts, spindles, crankshafts, turbine shafts, gear wheels and pinions
• 17NiCrMo6-4 forged discs, disks, plates, tube sheets, blind flanges, weld neck flanges and custom flanges
• 1.6566 forged pipes, tubes, tubings, barrels, cylinders and crane wheels

We make 17NiCrMo6-4 parts that weigh from 30KGS to 30,000KGS per single piece, with a maximum diameter of 2 meters for solid bars, 6 meters for seamless rolled rings (with our 5-meter CNC seamless rolling machine), and the maximum length of 15 meters for long shafts (with our 6300T hydraulic forging press). Learn more information about our full forging capabilities on our Products page and our advanced production equipment on our Equipment page.

Industrial Applications & Proven Case Studies of 17NiCrMo6-4 (1.6566) Forgings

Our 1.6566 (17NiCrMo6-4) forged parts are used in heavy industry sectors that need high strength, excellent wear resistance, and reliable long-term performance in harsh operating environments. Following are our main application scenarios and proven project cases:

Wind Energy Industry

17NiCrMo6-4 is the best choice material for high-precision gear shafts, pinion shafts and ring gears in onshore and offshore wind turbine gearboxes. Our forged 17NiCrMo6-4 parts have excellent surface hardness after case hardening, so that they have great wear resistance and stable torque transmission even under extreme wind load and variable speed conditions. Made with vacuum degassed steel for great cleanliness, these parts meet the stringent quality standards of global wind energy projects. To date, we have delivered over 5,000 sets of 17NiCrMo6-4 wind turbine gearbox forgings to wind farm operators across Europe and Asia. And these parts have been working well for more than 10 years in harsh operating environments.

Cement & Building Materials Industry

We supply case-hardened 17NiCrMo6-4 pinion shafts, riding gear rings, pull torque rods and support rollers for cement mill rotary kilns, granulators, dryers and coolers. The 1.6566 steel has medium-high hardenability and excellent machinability ,which make sure it is the best choice material for these heavy-load parts. These parts always need high core toughness and  great surface hardness , which can make sure they work well in continuous high-temperature and high-torque operations. Our 17NiCrMo6-4 rotary kiln parts have been installed in more than 30 cement production lines across Southeast Asia and the Middle East, and they have helped clients reduce the frequency of equipment maintenance by 40% compared to ordinary steel counterparts.

Our 1.6566 forged parts include eccentric shafts, spindles, crusher belt pulley wheels and slewing bearing ball races for mining gyratory crushers, jaw crushers, excavators and mine hoist systems. The 17NiCrMo6-4 material has excellent impact toughness and fatigue resistance under heavy shock loads, while the carburized surface has high hardness to resist abrasion from hard rock and ore materials. We have provided custom 17NiCrMo6-4 crusher forgings for over 20 large mining groups in Australia, South America and China, and their lifetime is twice as long as that of standard carbon steel components.

Oil & Gas Industry

We manufacture 17NiCrMo6-4 gear shafts, pinion shafts, box riser joints and other important parts for onshore and offshore oil drilling rigs, mud pumps and subsea drilling equipment. The material has consistent microstructure and good hardenability , which makes sure it can work well in high-pressure, corrosive downhole environments. All our 17NiCrMo6-4 oil and gas forgings are made with advanced ladle metallurgy and vacuum degassing processes, and are manufactured in accordance with the dimensional and material requirements of API 6A for oilfield equipment. Please contact us if API-certified products are required for your project. We have supplied more than 2,000 sets of these components for offshore drilling projects in the Gulf of Mexico and the South China Sea.

Railway & Locomotive Industry

We produce 17NiCrMo6-4 forged transmission shafts, traction motor end housings, rear end shields and gear couplings for railway locomotives and metro vehicles. The 1.6566 case hardening steel has excellent fatigue strength and impact resistance, which is important for locomotive transmission parts that withstand frequent start-stop and variable load operations. Our 17NiCrMo6-4 locomotive parts are manufactured to meet railway industry quality requirements, and are used in domestic and international railway projects across Asia and Africa.

General Engineering & Power Transmission

Our 1.6566 forged products also cover crane wheels, hydraulic honed cylinders, conveyor pulley shafts, gearbox gear wheels, ring gears, crankshafts for gas compressors, mechanical presses and pumps, hydro turbine shafts, flue gas desulfurization atomizer shafts, electric shovel components, offshore anchor winch parts, and truck concrete mixer bearings. We also supply custom 17NiCrMo6-4 forgings for sugar mill equipment, including gear shafts, pinion shafts, roller shafts and flanges.

17NiCrMo6-4 (1.6566) Steel Chemical Composition (EN 10084)

The chemical composition of our 17NiCrMo6-4 forging steel strictly meets EN 10084 international standards, following are the main element ranges:

Heat Treatment Process for 17NiCrMo6-4 (1.6566) Forged Parts

We provide full in-house heat treatment services with 10 professional CNC heat treatment furnaces, making sure all of 17NiCrMo6-4 (1.6566) forged parts meet clients mechanical requirements. Following are our heat treatment processes :

• Normalizing: 850 – 880°C / Air Cooled
• Soft Annealing: 650 – 700°C / Furnace Cooled
• Stress Relieving: 630 – 650°C
• Carburising: 880 – 980°C (case depth up to 8mm available)
• Core Hardening: 830 – 870°C / Water or Oil Quenched
• Intermediate Annealing: 630 – 650°C
• Case Hardening: 780 – 820°C / Water or Oil Quenched
• Tempering: 150 – 200°C

We provide custom heat treatment processes based on clients technical requirements. That includes deep carburizing, cryogenic treatment and vacuum hardening. All heat treatment processes are fully documented and traceable, and the complete temperature curve records are available for every batch.

Mechanical Properties of 17NiCrMo6-4 (1.6566) Forgings

The mechanical properties of our 17NiCrMo6-4 (1.6566) forgings are tested at 20°C, following are the  typical values . We select qualification test coupons (QTC) from each heat treatment lot for testing, which strictly meet international standards.

The mechanical testing is done based on  ASTM A370, ASTM E8 or ISO 6892-1 international standards, and the hardness testing meet ISO 6506-1, ASTM E10, ISO 6508-1 or ASTM E18. We provide ISO 6507-1 / ASTM E384  for size-limited parts. Full test reports are included with every EN 10204 3.1 Mill Test Certificate. Typical mechanical property values reference EN 10084:2008. Values are for guidance only; actual results depend on section size and heat treatment condition.

Strict Quality Control for 17NiCrMo6-4 (1.6566) Forged Parts

 All finished 17NiCrMo6-4 (1.6566) forged parts are fully tested by our in-house QC department before they are delivered, which makes sure they all meet international standards and client specifications. Following are our full inspection process:

1. Raw material incoming inspection: check the full chemical composition and heat traceability for each heat of steel
2. Forging process inspection: monitor the forging ratio , control temperature , and check dimensions during production
3. Heat treatment process monitoring: record the full temperature curve for each heat treatment batch
4. Examine final visual surface and 100% dimension test with marking verification
5. Check the chemical composition via direct reading spectrometer
6. Mechanical property testing (tensile, impact, hardness) with standard test coupons
7. Macrostructure and microstructure metallographic examination
8. Residual stress measurement for important parts
9. 100% Ultrasonic testing (UT) for internal defects, making sure they all meet EN 10228, ASTM A388 standards
10. Penetrant testing (PT) for surface defects, making sure they all meet ASTM E165 standard

We provide magnetic particle testing (MT) and radiographic testing (RT). Third-party inspection set by BV, SGS, TUV are available based on clients' requirements. Learn more information about our advanced production and inspection equipment on our Equipment page.

17NiCrMo6-4 (1.6566) Equivalent Steel Grades Cross-Reference

To help procurement engineers choose the correct material specification, following is a cross-reference table of international equivalent steel grades for 17NiCrMo6-4 (1.6566) case hardening steel:

Important Note: The above equivalent grades are approximate cross-references only. Actual chemical composition ranges and mechanical property needs may differ by different national standards. For important applications, always specify the exact standard and grade designation (e.g., "17NiCrMo6-4 per EN 10084") in your purchase order to make sure all parts meet your project requirements. Our engineering team can give you professional suggestions on the correct material specification for your application — contact us for expert technical support.

Frequently Asked Questions (FAQ)