AISI 6150 Forging Quick Facts
AISI 6150 vs 4140 vs 5150: When to Choose 6150
AISI 6150 is often used in extrem conditions needing a stronger balance of wear resistance, fatigue resistance and toughness than common medium-alloy alternatives. Buyers always compare AISI 6150 with AISI 4140 and AISI 5150 when they select materials.
| Grade | Main alloy feature | Typical strength / wear profile | Typical use decision |
|---|---|---|---|
| AISI 6150 | Chromium + vanadium | High toughness, good fatigue resistance and strong wear performance after heat treatment | Choose for shafts, gear-related parts, springs, impact-loaded and wear-loaded forged components |
| AISI 4140 | Chromium + molybdenum | Very versatile with good strength and machinability | Choose when broad availability and general-purpose performance are the priority |
| AISI 5150 | Chromium steel without the same vanadium emphasis | Good hardenability but generally lower grain-refinement benefit than 6150 | Choose when the application does not require the extra wear and fatigue advantage of 6150 |
Simple selection rule:If your forged parts operate under repeated shock, wear or cyclic loading, AISI 6150 is usually a better choice than AISI 5150.
It is also often selected as an upgraded material over general‑purpose AISI 4140.AISI 6150 Forging Parts: Quick Buyer Summary
Short answer: AISI 6150 (UNS G61500) is a chromium-vanadium alloy steel, and it is used for forged parts that need wear resistance, toughness, good hardenability and reliable fatigue performance.
- Common forged forms: bars, rolled rings, shafts, sleeves, housings, discs and custom open die forgings.
- Typical buyers: OEMs, EPC contractors, maintenance teams and global industrial distributors.
- Typical applications: mining equipment, gear transmission systems, power generation, cement plants and oil & gas machinery.
What is AISI 6150 (UNS G61500) Alloy Forging Steel?
Jiangsu Liangyi Co.,Limited is a China-based manufacturer of custom AISI 6150 (UNS G61500) forging parts. Our company produces open die forgings, seamless rolled rings and machined forged components for heavy-duty industry.We provides clients material traceability, heat treatment and export document according to their requirements..
AISI 6150 is a chromium-vanadium alloy steel,and it has good wear resistance, shock resistance, toughness and good hardenability. It is used for components that work under impact loading, cyclic stress and extrem working conditions.
Why Choose Jiangsu Liangyi for Your AISI 6150 Forging Needs?
🏭 Full In-House Production
We provide a full process control from melting steel,forging, heat treatment to fine machining
📏 Customization Capability
Custom AISI 6150 forgings ranging from 30KG to 30000KG per piece according to your 2D/3D drawings and technical requirements.
✅ International Certified
ISO 9001:2015 certified and fully meet ASTM, EN, DIN, API, and ISO international standards.An EN 10204 3.1/3.2 certificate is included..
🌎 Global Export Expertise
25+ years of export experience, serving clients in 50+ countries, professional English-speaking team for after-sales support.
⚙️ Advanced Production Equipment
We have 10 heat treatment furnaces, 2000T-6300T hydraulic presses, 1-5M seamless rolling machines
🔍 Strict Quality Inspection
Full non-destructive testing (UT/MT/PT/RT), chemical analysis, testing of mechanical properties, and all parts are inspected before delivery.
⚡ Fast Response & Lead Time
Free quote within 24 hours after receiving your drawing, standard lead time 15-30 working days, full support for urgent order
💰 Factory Direct Pricing
No middleman, factory direct supply products with competitive pricing and high quality
What to Send for a Faster AISI 6150 Forging Quote
- 2D drawing or 3D model
- Required material grade and any equivalent grade
- Forged size, unit weight and annual quantity
- Heat treatment condition and target hardness or mechanical properties
- NDT, UT, MT, PT or third-party inspection requirements
- Machining scope, tolerances, marking and packing requirements
- Destination port and preferred trade term such as FOB, CIF or DDP
Full Range of Custom AISI 6150 (UNS G61500) Forged Steel Products
We provide custom AISI 6150 and UNS G61500 forging parts in a full range of shapes, sizes, and specifications, strictly meeting clients drawings and technical requirements. Our production capacity covers single piece weights from 30KG to 30000KG, with full capabilities for advanced forging, machining, and heat treatment processes:
AISI 6150 Forged Bars & Rods
forged round bars, square bars, flat bars, rectangular bars, and custom step rods, manufactured to strict dimensional tolerances for industrial machinery applications.
UNS G61500 Seamless Rolled Rings & Forged Rings
Seamless hot-rolled rings, riding gear rings, slewing bearing ball races, gear rings, and custom contoured forged rings for heavy rotating machinery,They are produced on our 1–5 meter seamless ring rolling mills.
AISI 6150 Forged Shafts, Gears & Transmission Components
gear shafts, pinion shafts, spindles, gear wheels, crankshafts, coupling shafts, turbine shafts, and other custom power transmission parts for industrial gearboxes and heavy-duty equipment.
UNS G61500 Forged Housings, Sleeves & Hollow Components
Hubs, housings, shells, sleeves, bushes, casings, hollow bars, hydraulic honed cylinders, and custom hollow forgings for oil & gas, mining and marine applications.
AISI 6150 Forged Discs, Plates & Custom Components
Discs, disks, blocks, plates, pipe tubes, barrels, flanges, tube sheets, and fully custom open die forgings, meeting your special technical requirements. View our full forged product range here.
Key Properties & Advantages of AISI 6150 Alloy Forging Steel
AISI 6150 (UNS G61500) is a high quality alloy steel used for heavy-duty forging conponents, and its main properties are better than standard carbon steel and common alloy steels like AISI 4140:
- Ultra-fine grain quality (G6 and finer per international standards), making sure the forgings have consistent strength and toughness
- Excellent abrasion and wear resistance, making sure they can work well for a long time in high-friction and extrem working conditions
- Great shock resistance and impact toughness after heat treatment, making sure it is the best choice material for heavy load and cyclic loading applications
- Excellent hardenability, consistent mechanical properties even in large-parts thick forgings
- High fatigue strength, resisting crack propagation and failure in long-term continuous operation
- Good machinability, supporting fine machining to meet tight tolerance requirements
- Good temperature resistance, maintaining stable performance in moderate high-temperature working environments up to 300°C
- Excellent corrosion resistance in atmospheric and mild industrial environments, with optional surface treatments available for improved corrosion protection
Manufacturing Process & Quality Standards for AISI 6150 Forgings
Our AISI 6150 forging products are made to meet international standards, including ASTM A29, EN 10083-3, DIN 17200, ISO 6336-5, API 6A, and JIS G4801 specifications. Following is Our forging process .
- Primary melting via 30T electric arc furnace (EAF) with oxygen blast converter, followed by comprehensive ladle refining (LF) treatment
- Vacuum degassing (VOD) treatment to make sure they have high steel purity, reduce gas content, and eliminate internal defects
- Non-radioactive material control to meet global industrial safety and environmental requirements
- Precision forging on 2000T-6300T hydraulic presses and 1T-5T electro-hydraulic hammers, making sure it has the best grain flow and structural integrity
- Custom heat treatment in our ten dedicated heat treatment furnaces, to get your desired mechanical properties
- Full precision machining, surface treatment, and final inspection before delivery
- Minimum MQ quality class meet ISO 6336-5 or DIN 3990-5 for all gear applications
Chemical Composition of UNS G61500 (AISI 6150) Alloy Steel
Chemical analysis is done to test samples taken prior to or during pouring, with all results meet the strict chemical requirements for UNS G61500 (AISI 6150) steel. We provide the full mill test certificate (MTC) EN 10204 3.1/3.2 for every order.
| Element | Content Range (Weight %) |
|---|---|
| Carbon (C) | 0.48 - 0.53 |
| Chromium (Cr) | 0.8 - 1.1 |
| Manganese (Mn) | 0.7 - 0.9 |
| Silicon (Si) | 0.15 - 0.35 |
| Vanadium (V) | 0.15 Minimum |
| Phosphorus (P) | 0.035 Maximum |
| Sulphur (S) | 0.04 Maximum |
| Iron (Fe) | Balance |
We can change the chemical makeup of our products to fit your specific needs.View our full range of forging steel materials here.
Grain Size, Heat Treatment & Mechanical Properties
Grain Size Requirements
Our AISI 6150 forged bars have a grain size of G6 or finer, which meet EN-ISO 643, DIN 50601or ASTM E112-96 standards. Isolated individual G5 grains are acceptable, and full grain size certificate of every order is provided in our inspection report.
Standard Heat Treatment Process
We provide custom heat treatment according to your desired hardness and mechanical properties. Following is our heat treatment process for AISI 6150 forgings .
- Hardening: Heat to 1600°F (871°C) followed by controlled oil quenching
- Tempering: Custom tempering temperature and holding time to get your target mechanical properties
- Normalizing: Heat to 1650°F (899°C) then air-cooled for consistent microstructure and delete internal stress.
- Stress Relief Annealing: Available for large forgings to delete residual stress
- Typical As-Annealed Brinell Hardness: 260 HB
Mechanical Properties of AISI 6150 Forged Raw Material
| Mechanical Property | Standard Value (Annealed Condition) |
|---|---|
| Ultimate Tensile Strength | 670 MPa (97200 psi) |
| Yield Tensile Strength (0.2% Offset) | 415 MPa (60200 psi) |
| Elongation at Break (in 50 mm) | 23% Minimum |
| Reduction of Area | 40% Minimum |
| Impact Toughness (KV) | 27 J Minimum at Room Temperature |
Industrial Applications & Real-World Project Case Studies
AISI 6150 (UNS G61500) forgings are used in heavy industries that need high strength, wear resistance, and reliable performance in extreme working conditions. Our AISI 6150 forging parts are provided to over 50 countries and they are used in the following main industries:
Core Application Industries
- Sugar mills & food processing equipment
- Cement production & rotary kiln systems
- Wind & hydro turbine power generation
- Mining, crushing & mineral processing equipment
- Onshore & offshore oil & gas drilling and production equipment
- Railway locomotive & heavy transportation equipment
- Marine, shipbuilding & offshore engineering
- Industrial gearboxes, reducers & power transmission systems
- Gas & steam turbine power generation equipment
- Construction machinery & heavy lifting equipment
- Chemical processing & flue gas desulfurization equipment
Verified Real-World Application Case Studies
Case Study 1: Sugar Mill Gear Shafts for Southeast Asian Sugar Group
We provide custom forged AISI 6150 gear shafts, pinion shafts, and roller shafts for a large Southeast Asian sugar conglomerate. These parts have great hardness and toughness after heat-treatment , so they have excellent wear resistance in continuous heavy-duty sugar mill operations. Compared with standard carbon steel components, the lifetime of the final product is increased by more than 60%, which make sure they can work stablly for more than 5 years.
Case Study 2: Wind Turbine Gearbox Components for Domestic Wind Power Leader
We supplied AISI 6150 forged gear shafts and ring gears for a top Chinese wind turbine manufacturer.These components are vacuum-degassed and grain-refined to G6 or finer, meeting the high torque and fatigue strength requirements for 2.5MW+ wind turbines, and They are used in onshore and offshore wind farms throughout China.
Case Study 3: Mining Crusher Eccentric Shafts for Australian Mining Company
We make UNS G61500 forged eccentric shafts and spindles for gyratory crushers for a large Australian mining enterprise.The parts passed non-destructive testing (NDT) and residual stress measurement. They are very tough and resistant to wear and tear, making them great for crushing hard rock.Our forged parts made in China worked just as well as the ones we imported, which helped clients save 35% on maintenance costs.
Case Study 4: Oil & Gas Drilling Tool Shafts for Middle East Oilfield Service Provider
We produced AISI 6150 forged gear shafts and herringbone gear shafts for mud pumps for a leading Middle East oilfield service company. The products meet ISO 6336-5 MQ quality grade and API specifications, with excellent corrosion resistance and fatigue performance for harsh offshore drilling environments. All components passed third-party inspection and have been used in multiple offshore oil and gas fields.
Case Study 5: Cement Rotary Kiln Pinion Shafts for Large Chinese Cement Group
We supplied AISI 6150 forged case-hardened pinion shafts and riding rings for 5000t/d cement rotary kiln lines for a top Chinese cement manufacturer. The parts have consistent hardness and excellent creep resistance after quenching and tempering treatment, so they are the best choice material for high-temperature, continuous heavy-load operation. The components have been running stably in many cement production lines for over 3 years.
Quality Inspection & Certification for AISI 6150 Forgings
Every finished AISI 6150 forged product is inspected before delivery, with a full inspection report to make sure it meets clients specifications and international standards. Following are our standard inspection process.
- Full identification document (part number, material designation, order number, drawing number, specification number)
- Full heat number traceability, heat chemical analysis report and melting method document
- Full heat treatment certificate, including cooling method, actual part temperature, holding time, cooling conditions, and full temperature-time graphs for all re-heat treatments
- Full non-destructive testing (NDT) records (UT, MT, PT, RT as required) and NDT inspector certification
- Full mechanical property test results (tensile strength, yield strength, elongation, hardness, impact test)
- Residual stress measurement results (for process qualification)
- Full dimensional and visual inspection report
- Cleaning verification and non-conformance deviation reports (if applicable)
- Mill Test Certificate (MTC) EN 10204 3.1 / 3.2 as required
Third-party inspection from SGS, BV, TUV, and other international inspection agencies is also available as per clients requirements.
Marking Requirements for Finished AISI 6150 Forged Components
Each finished AISI 6150 or UNS G61500 forged part is clearly marked to make sure it is traceable throughout its lifetime. Following are the standard marking:
- Purchaser's part number
- Purchaser's purchase order number
- Unique individual part identification number
- Heat number (if traceability cannot be achieved via the individual part number)
- Our company logo (optional, per customer request)
All markings are enclosed in a frame or coated with durable white paint to make sure they are clear even in harsh working environments. Custom marking requirements are fully supported as per your specifications.
Technical and Search Reference Notes
Material selection and purchasing decisions for AISI 6150 forgings should always be checked according to the final drawing, heat treatment target, inspection plan and industry standard. Commonly referenced standards include ASTM A29/A29M, EN 10083-3, DIN 17200 and EN 10204 certification.
Frequently Asked Questions (FAQ) About AISI 6150 Forgings
AISI 6150 (UNS G61500) is a chromium-vanadium alloy steel, similar to 50CrV4 (EN 10083-3), 50CrVA (GB/T 3077), and SUP10 (JIS G4801). It is often compared with AISI 4140, but its higher carbon and vanadium content provide better resistance and toughness.
We can produce custom AISI 6150 forgings weighing from 30KG to 30000KG. We can make seamless rolled rings with the maximum outer diameter up to 5 meters, and we can make forged bars with the maximum length up to 12 meters and diameters from 50mm to 1200mm. We can make any size, shape, or specification based on clients requirements.
The hardness of AISI 6150 can be fully customized to meet clients requirements.The hardness usually ranges from 28 HRC to 55 HRC after quenching and tempering. It can be changed up to 58 HRC for high-wear applications, while for high-toughness applications, it can be adjusted to 25-32 HRC. The normal as-annealed hardness is 260 HB (approximately 26 HRC).
Our AISI 6150 forgings strictly meet international standards including ASTM A29/A29M, EN 10083-3, DIN 17200, ISO 683-1 and API 6A . They also meet industry-specific standards for gear applications (ISO 6336-5, DIN 3990-5) and pressure vessel applications. All products are fully inspected to meet these standards before delivery.
Yes, we produce custom AISI 6150 forgings based on clients drawings and technical requirements. We provide the full service from steel melting, forging, heat treatment, machining, surface treatment, to final inspection. Our engineering team will provide clients a detailed quote within 24 working hours.
Our standard lead time for custom AISI 6150 forgings is 15-30 working days, and the expedited lead time is 7 to 15 business days for urgent orders.All actual production time depends on clients drawing, quantity and machining requirement.
Our minimum order quantity (MOQ) for small custom parts is one piece, and we support both one piece sample orders and large-volume mass production orders.
Yes, we provide full fine machining services for AISI 6150 forgings, including rough machining, finish machining, CNC milling, CNC turning, grinding, drilling, and threading. We can supply forgings in as-forged condition, rough machined condition or fully finished condition according to clients drawings.
With every AISI 6150 forging order, we provide a full Mill Test Certificate (MTC) EN 10204 3.1 as standard, which includes chemical composition analysis, mechanical property test results, heat treatment records, and dimensional inspection results. And the third-party inspection is available based on clients requirement.
We could deliver goods to all international sea ports in shipping terms like FOB Shanghai, CIF, EXW and DDP. Sea freight, air freight and express delivery(DHL,FedEx and UPS) are available according to clients requirements.
The main difference between AISI 6150 and AISI 5150 is their vanadium content. AISI 6150 contains a minimum of 0.15% vanadium, which improves grain refinement, hardenability, high-temperature strength, and wear resistance compared to AISI 5150. AISI 6150 has better impact toughness and fatigue strength, making it a better choice for heavy-duty, high-load applications that need long lifetime in harsh working environments.