20MnCr5 (1.7147) Forging Parts Manufacturer in China
Established in 1997, Jiangsu Liangyi Co.,Limited is an ISO 9001:2015 certified professional manufacturer of 20MnCr5 (1.7147) forging parts , open die forgings and seamless rolled steel forged rings from Jiangyin, Jiangsu, China. With an 80,000㎡ factory and 120,000 tons annual capacity, we supply high-performance 20MnCr5 forged parts to over 50 countries across Europe, North America, the Middle East, and Southeast Asia, fully in accordance with EN 10084, DIN, ASTM international standards.
Last updated: 2026-03-22 | This page is structured for both traditional search engines and AI answer engines.
Quick answer: what buyers should know about 20MnCr5 forging parts
20MnCr5 (1.7147) is a case-hardening steel used for gears, shafts, pinions and other high-load wear parts. Buyers usually choose it when they need a hard carburized surface, a tough core, traceable certification and the option to combine forging, heat treatment and machining in one supply chain.
Technical snapshot of 20MnCr5 (1.7147) forging parts
This compact section makes the key specification signals visible in HTML, not only in schema, which helps both search engines and AI systems extract the right answer faster.
| Material grade | 20MnCr5 / 1.7147 |
|---|---|
| Material family | Low-carbon case-hardening steel |
| Main standard | EN 10084 |
| Main part types | Forged bars, rolled rings, shafts, pinions, flanges, housings and custom parts |
| Main heat treatment options | Soft annealing, normalizing, carburizing, hardening and tempering |
| Main carburized surface hardness | 58-62 HRC as stated on the page |
| Manufacturing scope | Steel melting, forging, heat treatment, machining and inspection |
| Inspection documents | MTC 3.1/3.2, size reports, UT, MT/PT and hardness records as applicable |
| Lead time | 15-30 days for standard orders according to the page |
Table of contents
20MnCr5 (1.7147) Forging Parts Product Range & Custom Capabilities
We custom manufacture full range of 20MnCr5 (1.7147) forged steel parts strictly in accordance with EN 10084, DIN, ASTM international standards and clients' drawings, including:
- Forged Bars & Rods : 20MnCr5 forged round bars, square bars, flat bars, rectangular bars, and solid rods
- Seamless Rolled Rings & Flanges : 20MnCr5 seamless rolled rings, forged flanges, riding gear rings and contoured rolled rings
- Forged Shafts & Gear Parts : 1.7147 forged gear shafts, pinion shafts, spindles, gear wheels, pinions, crankshafts and turbine shafts
- Forged Housings, Sleeves & Hollow Parts : 20MnCr5 forged hubs, housings, shells, sleeves, bushes, casings, hollow bars, pipes, barrels and valve bodies
- Forged Discs, Plates & Blocks : 1.7147 forged discs, disks, blocks, plates and tube sheets
20MnCr5 (1.7147) Material Properties & Advanced Manufacturing Process
20MnCr5 (1.7147) is a good low-carbon case-hardening steel with great harden ability, widely used in heavy-duty industrial uses. After precision case hardening treatment, it gets high surface hardness for good wear resistance, while its uniform fine grain size makes it have good ductility, impact resistance and fatigue strength. This makes it the ideal material to make high-load gearboxes, axle gears, transmission parts and heavy machinery parts.
All our 20MnCr5 forged steels are melted in ultra-high power electric arc furnaces, then refined using advanced ladle metallurgy. Vacuum degassing and vacuum oxygen decarburization (VOD) processes ensure the best cleanliness of steel, and the optional electroslag remelting (ESR) can meet the strict technical requirements of customers. We provide one-stop service from steel melting, forging, heat treatment to precision machining according to your drawings.
Equivalent grades and naming references for 20MnCr5
Industrial buyers often search by local grade names rather than EN names. Keeping these references visible on the page improves discoverability for procurement teams and AI search experiences.
| System | Grade / Name | Context on this page |
|---|---|---|
| EN / DIN | 20MnCr5 / 1.7147 | Primary naming used across this page |
| AISI / SAE | 5120 | Shown in the FAQ as a common equivalent reference |
| DIN reference naming | 20CrMn5 | Shown in the FAQ as an equivalent reference |
| JIS | SMnC420 | Shown in the FAQ as an equivalent reference |
Chemical Composition of 20MnCr5 (1.7147) Forged Steel (EN 10084 Standard)
The chemical composition of our 20MnCr5 (1.7147) forging parts strictly in accordance with the international standards, with mill test certificate (MTC) 3.1/3.2 provided for every order:
| Chemical Element | Standard Content Range |
|---|---|
| Carbon (C) | 0.17 - 0.22 % |
| Silicon (Si) | Max 0.4 % |
| Manganese (Mn) | 1.1 - 1.4 % |
| Phosphorus (P) | Max 0.025 % |
| Sulfur (S) | Max 0.035 % |
| Chromium (Cr) | 1.0 - 1.3 % |
Heat Treatment Specifications for 20MnCr5 Forging Parts
We provide full in-house heat treatment services for 20MnCr5 (1.7147) forging parts, with strict process control to meet your required mechanical properties and microstructure requirements:
- Soft Annealing : Heat to 650-700°C, controlled furnace cooling for machinability improvement
- Normalising : 850-880°C, air cooling for grain refinement and internal stress relief
- Carburizing : Temperature 900-950°C, with optional cooling media including water, oil, air, thermal bath, or cooling box
- Hardening : Core hardening at 850-880°C; Case hardening at 810-840°C, with quenching media including water, oil, air, or thermal bath
- Tempering : Tempering temperature 150-200°C, adjusted based on your required hardness and toughness
- Hot Forging : Hot forming temperature range 1100-850°C, with closed die and open die forging options
- Hot Rolling : Rolling temperature 1220°C, finishing temperature above 900°C
Mechanical Properties of 20MnCr5 Forged Raw Material
The mechanical properties of our 20MnCr5 forged raw material vary by section size, with the following main values after heat treatment:
| Section Size (mm) | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Reduction of Area (%) | Hardness (HB) |
|---|---|---|---|---|---|
| 11 | 1230-1570 | 930 | 17.5 | 30 | 363-438 |
| 30 | 930-1230 | 690 | 8 | 20 | 278-363 |
| 63 | 780-1080 | 540 | 9 | 25 | 232-327 |
Why Choose Our 20MnCr5 Forging Parts
Full Traceability & Quality Control
Full-process quality control from steel melting to finished products, with complete MTC 3.1/3.2 certification and non-destructive testing reports for every order.
Flexible MOQ & Fast Delivery
We support small-batch to large-batch production. The standard delivery period is 15 to 30 days. Urgent orders can be expedited.
One-Stop Custom Service
From forging, heat treatment, precision CNC machining to surface treatment, we provide one-stop service strictly according to your drawings and requirements.
Global Logistics & Support
Rich experience in global delivery to 50+ countries, with professional technical support and after-sales service, DDP/DDU/FOB/CIF trade terms available.
Industry Applications & Global Case Studies of 20MnCr5 Forging Parts
Our 20MnCr5 (1.7147) forging products are widely used in heavy industries worldwide, with stable performance in hard working environments:
Sugar Mill
We make custom 20MnCr5 forged gear shafts, pinion shafts, roller shafts, and flanged couplings for large-scale sugar mill crushing and processing equipment. Our case-hardened 1.7147 forgings have good wear resistance and fatigue strength, ensuring stable continuous operation of sugar mill systems under high-load working conditions for our clients in Southeast Asia and South America.
Cement Plants & Mining Industries
Our 20MnCr5 forged surface hardening grinding pinion shaft is a main part of the cement grinding rotary kiln. We also manufacture eccentric shafts, spindles, and belt pulley wheels for gyrator crushers and mining rock crushing equipment, as well as forged slewing bearing ball races for mining excavators. These parts are widely used for mining projects in Australia and Africa, they can work well with the heavy impact loads in hard working environments.
Wind & Hydro Power Industry
Our 20MnCr5 forged gear shafts, ring gears, and gear wheels are critical parts for wind turbine gearboxes, with over 10,000 sets of 1.7147 forgings used in onshore and offshore wind farms across Europe and Asia. We also provide custom 20MnCr5 hydro turbine shafts, meeting the strict mechanical property and reliability requirements of hydropower generation equipment.
Oil & Gas Drilling Industry
We manufacture 20MnCr5 forged gear shafts, pinion shafts, wellhead spool bodies, and box riser joints for onshore and offshore oil and gas drilling equipment. Our products include herringbone gear shafts for drilling rig mud pumps, as well as parts for tri-cone drill bits (PDC cutter bodies). All our 20MnCr5 forgings for the oil and gas industry meet API 6A standards, with good structural stability and corrosion resistance for Middle East and North American projects.
Railway & Heavy Transportation Industry
Our 1.7147 forged locomotive transmission shafts, traction motor end housings, and rear end shields are supplied to railway locomotive manufacturers across Asia and Europe. We also produce 20MnCr5 forged ring gears, planet gears, and pinion shafts for heavy-duty trucks, as well as seamless hot-rolled bearing rings for truck concrete mixers and semi-trailers.
General Industrial Machinery
We provide 20MnCr5 forged crankshafts for gas compressors, mechanical presses, and industrial pumps, as well as gear shafts, ring gears, and pinion shafts for gearboxes and speed reducers. Our other widely used products include forged gear couplings, thread tie rods, hydraulic honed cylinders, conveyor pulley shafts, rotary dryer trunnion wheels, and parts for granulators, driers, and flue gas desulfurization systems.
Strict Quality Assurance for 20MnCr5 (1.7147) Forged Parts
We implement full-process quality control for all our 20MnCr5 (1.7147) forging parts , with advanced inspection equipment from our in-house inspection lab . A full set of test certificates is provided for each finished product, including:
- Heat number and melting type details
- Full size inspection report
- Complete details of the heat treatment cycle used
- Full chemical analysis results, including tramp elements
- Mechanical test results, including hardness test, with all individual values reported
- Ultrasonic test (UT) results
- Magnetic particle test (MT) / Penetrant test (PT) surface crack examination results
- Visual inspection confirmation
- Verification inspection confirmation
- Results of any other tests specified in the drawing or purchase order
Frequently Asked Questions About 20MnCr5 Forging Parts
20MnCr5 (1.7147) is a case-hardening steel mainly used for manufacturing high-load gear components, gear shafts, pinions, transmission parts, crankshafts, and wear-resistant parts in gearboxes, wind turbines, mining machinery, cement plants and heavy trucks. It is ideal for uses requiring high surface hardness, wear resistance and core toughness.
20MnCr5 (EN 1.7147) is equivalent to 5120 steel (AISI/SAE), 20CrMn5 steel (DIN) and SMnC420 (JIS). It is a widely used European standard case-hardening steel, fully in accordance with EN 10084 standard.
After carburizing and quenching, the surface hardness of 20MnCr5 can reach 58-62 HRC, with core hardness mainly between 28-35 HRC, depending on the section size and heat treatment process. The specific hardness can be adjusted according to your use requirements.
Yes, we provide one-stop service from forging, heat treatment to precision CNC machining of 20MnCr5 parts, strictly according to your custom drawings and technical manuals. We can produce parts ranging from 30KGS to 30,000KGS, with complete inspection and certification.
Standard lead time for custom 20MnCr5 forging parts is 15-30 days, depending on the complexity, quantity, and other machining requirements. Expedited service is available for urgent orders, with lead time as short as 7-10 days for simple parts.
What to include in your RFQ for faster quotation
To speed up engineering review and pricing, buyers usually send the drawing number, sizes, estimated weight, order quantity, heat treatment requirement, machining scope, inspection standard and target delivery term.
Get Your Custom 20MnCr5 Forging Parts Quote Today
We welcome your inquiry for custom 20MnCr5 (1.7147) forging parts . Send us your drawings and technical manuals, our professional engineering team will provide you with a free custom quotation within 24 hours.
Contact Us Now for Free QuoteFor the latest product details, updated specifications and more information, please visit our official product page: https://www.jnmtforgedparts.com/20mncr5-17147-forging-parts.html . We will provide you with professional forging solutions and high-quality products from our Jiangyin, Jiangsu manufacturing base in China.