Project Description
AISI 4330Vmod — Premium Through-Hardening Nickel-Molybdenum-Vanadium Steel
Product Description
SHUNFU METAL offers premium AISI 4330Vmod steel, an advanced through-hardening Nickel-Chromium-Molybdenum-Vanadium (NiCrMoV) alloy steel specifically engineered for applications demanding exceptional mechanical properties in large sections. This high-performance material, with its optimized chemical composition and enhanced hardenability, delivers superior strength, outstanding toughness, and excellent fatigue resistance even in large cross-sections. The carefully balanced chemistry includes increased nickel content (1.7-2.0%, optionally up to 3.0%) to ensure unparalleled hardenability and performance in the most demanding environments.
As an API Q1 certified manufacturer with fully calibrated and certified heat treatment furnaces (compliant with AMS 2750), SHUNFU METAL ensures consistent quality through rigorous process controls. Each batch undergoes comprehensive testing by CNSA (China National Standards Association) to verify compliance with international standards. Our AISI 4330Vmod steel delivers significantly longer tool life and higher strength compared to conventional 4145 steel, making it the ideal choice for critical drilling components, including subs, crossovers, reamers, drill shoes, drill jars, and other high-stress tools that require exceptional reliability in challenging oil and gas environments.
Key Advantages
- Superior Through-Hardenability: Exceptional ability to achieve consistent hardness and mechanical properties throughout large cross-sections
- Enhanced Fracture Toughness: Carefully balanced chemistry with relatively low carbon content provides excellent impact resistance and fracture toughness
- Outstanding Strength: Capable of achieving very high strength levels (150 ksi minimum yield strength) in large sections
- Excellent Shock Resistance: Optimized for applications involving shock loading or stress concentrations
- Improved Fatigue Performance: Vanadium modification forms fine carbides that enhance fatigue resistance in cyclic loading applications
- Ultra-Clean Steel: Very low sulfur content (≤0.010%) and phosphorus content (≤0.015%) for superior toughness
- Good Weldability: Can be successfully welded with proper preheat and post-weld heat treatment
- Good Forgability: Demonstrates excellent hot working characteristics with appropriate preheating and controlled cooling
- 100% Ultrasonic Testing: Complete quality verification with ASTM A388 ultrasonic inspection to API 6A PSL 3 standards
- CNSA Verification: Each batch independently tested by China National Standards Association
Chemical Composition
SHUNFU METAL’s AISI 4330Vmod steel features a carefully controlled chemistry to achieve optimal mechanical properties:
| Element | Minimum % | Maximum % |
|---|---|---|
| Carbon (C) | 0.30 | 0.33 |
| Silicon (Si) | 0.15 | 0.35 |
| Manganese (Mn) | 0.75 | 1.00 |
| Phosphorus (P) | – | 0.015 |
| Sulfur (S) | – | 0.010 |
| Chromium (Cr) | 0.80 | 1.00 |
| Nickel (Ni)* | 1.70 | 2.00 |
| Molybdenum (Mo) | 0.40 | 0.65 |
| Vanadium (V) | 0.05 | 0.10 |
| Aluminum (Al) | 0.01 | 0.04 |
| Copper (Cu) | – | 0.35 |
| Tin (Sn) | – | 0.035 |
* Nickel content can be modified to 1.7-3.0% to ensure greater hardenability for larger sections or more demanding applications.
Role of Key Alloying Elements in Through-Hardening Performance
- Nickel (1.70-2.00%): Provides exceptional toughness, especially at low temperatures, and significantly enhances hardenability throughout large sections
- Chromium (0.80-1.00%): Improves hardenability and wear resistance while contributing to overall strength
- Molybdenum (0.40-0.65%): Enhances hardenability, reduces temper embrittlement, and improves high-temperature strength
- Vanadium (0.05-0.10%): Forms fine carbides that refine grain structure, improve fatigue resistance, and enhance strength retention
- Controlled Carbon (0.30-0.33%): Carefully balanced to optimize strength while maintaining excellent toughness and weldability
- Low Sulfur and Phosphorus: Tight control improves transverse properties and fatigue resistance by minimizing inclusion content
Mechanical Properties
SHUNFU METAL’s AISI 4330Vmod in quenched and tempered condition delivers exceptional mechanical properties even in large sections:
Mechanical Properties for 150mm (6″) Diameter
| Property | Minimum | Maximum |
|---|---|---|
| 0.2% Yield Strength (Proof Stress) | 150 ksi (1,034 MPa) | – |
| Ultimate Tensile Strength (UTS) | 165 ksi (1,138 MPa) | – |
| Elongation | 15% | – |
| Reduction of Area | 50% | – |
| Hardness (HB) | 341 | 372 |
Impact Properties (150mm Diameter)
| Test Temperature | Minimum Charpy V-Notch Value |
|---|---|
| Room Temperature | 54 J (40 ft-lb) |
| -20°C (-4°F) | 40 J (30 ft-lb) |
Mechanical Properties for 320mm (12.6″) Diameter
| Property | Minimum | Maximum |
|---|---|---|
| 0.2% Yield Strength (Proof Stress) | 150 ksi (1,034 MPa) | – |
| Ultimate Tensile Strength (UTS) | 160 ksi (1,103 MPa) | – |
| Elongation | 13% | – |
| Reduction of Area | 35% | – |
| Hardness (HB) | 319 | 390 |
Impact Properties (320mm Diameter)
| Test Temperature | Minimum Charpy V-Notch Value |
|---|---|
| Room Temperature | 54 J (40 ft-lb) |
Note: The above mechanical properties are achieved in the quenched and tempered condition. Properties are measured at the mid-radius location for sections up to 320mm diameter, demonstrating the exceptional through-hardenability of this grade.
Manufacturing Process
SHUNFU METAL’s AISI 4330Vmod steel undergoes a specialized manufacturing process to ensure premium quality and consistent properties:
Advanced Steel Production
- Premium Melting: Electric Arc Furnace (EAF) or Basic Oxygen Furnace (BOF) with precise chemistry control
- Advanced Ladle Refining: Extended refining for superior cleanliness and tight compositional control
- Vacuum Degassing: Comprehensive VDG process to achieve ultra-low hydrogen content and enhanced cleanliness
- Controlled Casting: Optimized casting parameters for improved solidification structure
- Enhanced Reduction Ratio: Minimum 4:1 reduction ratio (typically 3:1 on sections >300mm) to ensure optimum grain flow and mechanical properties
Specialized Heat Treatment
- AMS 2750 Certified Furnaces: All heat treatment performed in calibrated furnaces with precise temperature control
- Optimized Austenitizing: Carefully controlled heating cycles specifically designed for large sections to ensure uniform through-section temperature
- Precision Quenching: Advanced quenching techniques to achieve uniform properties throughout the cross-section
- Controlled Tempering: Computer-controlled tempering to achieve target mechanical properties
- Optional Stress Relief: Additional stress relief treatment available depending on customer requirements
Comprehensive Quality Assurance
- 100% Ultrasonic Testing: Every bar is ultrasonically tested per ASTM A388/A388M with acceptance criteria in accordance with API 6A PSL 3
- CNSA Verification: Each batch undergoes independent testing by China National Standards Association
- Microstructural Examination: Verification of grain size (ASTM 5-8) and proper microstructure
- Comprehensive Mechanical Testing: Testing for strength, hardness, and impact properties
- API Q1 Certified: All manufacturing processes comply with API Q1 quality management system
- QTC Testing: Our Quench, Temper, and Control procedures ensure optimal mechanical properties
Available Material Conditions
SHUNFU METAL offers AISI 4330Vmod steel in various conditions to suit specific processing requirements:
- Untreated: Suitable for customers who will perform their own heat treatment
- Annealed: Optimal condition for machinability and subsequent heat treatment
- Quenched and Tempered: Ready-to-use condition with specified mechanical properties
- Quenched, Tempered, and Stress Relieved: Enhanced dimensional stability for critical components
Surface Finish Options
- As Rolled: Standard finish for general applications
- As Forged: For custom forged components
- Bright Turned: Precision surface for improved machinability and inspection
Applications
AISI 4330Vmod steel from SHUNFU METAL is specifically engineered for critical applications in oil and gas drilling operations and other demanding environments:
Oil and Gas Drilling
- Drill Subs: Connection components between different parts of the drill string
- Crossovers: Transition components connecting different thread types
- Reamers: Tools used to enlarge or smooth wellbore sections
- Drill Shoes: Components that guide and protect drilling equipment
- Drill Jars: Critical tools that deliver impact force to free stuck drill strings
- Heavy-Wall Drilling Tools: Components requiring exceptional strength in large sections
- Downhole Motors: Critical components in directional drilling systems
Other High-Performance Applications
- Heavy Equipment Components: Critical load-bearing parts in large machinery
- Power Transmission Shafts: Large-diameter shafts transmitting high torque
- Aircraft Landing Gear Parts: Components requiring high strength and reliability
- High-Performance Fasteners: Large bolts and studs for critical connections
- Defense Industry Components: Critical parts requiring exceptional reliability
Specifications and Compliance
SHUNFU METAL’s AISI 4330Vmod steel meets or exceeds the following specifications:
- ASTM A29: Standard Specification for Steel Bars, Carbon and Alloy, Hot-Wrought
- ASTM A322: Standard Specification for Steel Bars, Alloy, Standard Grades
- API Spec 7: Specification for Drill Stem Elements
- ASTM A388/A388M: Standard Practice for Ultrasonic Examination of Steel Forgings
- AMS 2301: Steel Cleanliness, Aircraft Quality
- AMS 2750: Pyrometry – heat treatment furnace requirements
Note: While AISI 4330Vmod offers exceptional performance, it does not meet NACE MR0175 requirements for sour service due to its high nickel content.
Certifications
- API Q1: American Petroleum Institute Quality Management System
- ISO 9001: Quality Management System
- CNSA: China National Standards Association verification
- API 6A PSL 3: Product Specification Level for critical service
Product Forms and Sizes
SHUNFU METAL offers AISI 4330Vmod steel in various forms to meet diverse application requirements:
Round Bars
- Diameter Range: 25mm to 500mm (1″ to 20″)
- Standard Lengths: 3m to 12m (10′ to 40′)
- Custom lengths available upon request
Forged Components
- Custom forgings to customer specifications
- Near-net shape capability for cost optimization
- Heat treatment in accordance with specified requirements
Machining Tolerances
For bright turned material to ASTM A29 Tolerances:
| Diameter Range | Standard Tolerance | Precision Tolerance (Optional) |
|---|---|---|
| 25-100mm (1-4″) | ±0.25mm (±0.010″) | ±0.125mm (±0.005″) |
| 100-200mm (4-8″) | ±0.40mm (±0.016″) | ±0.20mm (±0.008″) |
| 200-300mm (8-12″) | ±0.50mm (±0.020″) | ±0.25mm (±0.010″) |
| 300-500mm (12-20″) | ±0.75mm (±0.030″) | ±0.38mm (±0.015″) |
Processing Considerations
Important processing information for optimal performance of AISI 4330Vmod steel:
Forging Recommendations
- Forging Temperature Range: 1150-1250°C (2100-2280°F)
- Preheat Recommendation: Thorough preheating recommended due to high hardenability
- Cooling After Forging: Slow, controlled cooling in furnace recommended to prevent cracking
Heat Treatment Guidelines
- Normalizing: 870-900°C (1600-1650°F), air cool
- Annealing: 830-850°C (1525-1560°F), slow furnace cool
- Hardening: 830-870°C (1525-1600°F), oil or polymer quench
- Tempering: 540-650°C (1000-1200°F) depending on desired strength level
Welding Considerations
- Preheat: 200-350°C (390-660°F) depending on section thickness
- Interpass Temperature: Maintain preheat temperature between passes
- Post-Weld Heat Treatment: Stress relief at 550-600°C (1020-1110°F) recommended
- Filler Metal: Use low hydrogen electrodes matching or slightly lower than base metal strength
4330Vmod vs. 4145: Comparative Advantages
Understanding the performance benefits of AISI 4330Vmod compared to conventional 4145 steel:
| Performance Characteristic | 4145 | 4330Vmod Advantage |
|---|---|---|
| Hardenability | Good | Superior in large sections due to higher Ni and Mo content |
| Fracture Toughness | Good | Excellent due to optimized C, Ni, V balance |
| Low Temperature Impact | Moderate | Superior due to higher Ni content |
| Fatigue Resistance | Good | Enhanced due to V addition and refined microstructure |
| Through-Section Property Uniformity | Decreases in large sections | Maintains uniformity in sections up to 320mm |
| Weldability | Moderate | Better due to lower carbon content |
| Tool Life in Drilling Applications | Standard | Significantly longer due to superior mechanical properties |
| Cost | Lower | Higher initial cost but better performance economics |
Technical Support and Services
SHUNFU METAL provides comprehensive technical support to help customers maximize the performance of our AISI 4330Vmod steel:
- Material Selection Guidance: Expert assistance in determining if 4330Vmod is appropriate for your application
- Heat Treatment Consultation: Recommendations for optimal heat treatment parameters for specific property requirements
- Metallurgical Support: Expert advice on microstructure development and properties
- Failure Analysis: Investigation and root cause analysis of material-related issues
- Custom Testing: Additional mechanical, chemical, or metallurgical testing as required
- Machining Recommendations: Guidelines for optimal machining parameters
- Forging Support: Technical guidance for successful hot working
- Enhanced Documentation: Comprehensive certification packages including detailed processing history
Why Choose SHUNFU METAL for AISI 4330Vmod
Selecting SHUNFU METAL as your supplier for AISI 4330Vmod steel provides numerous advantages:
- Material Expertise: Specialized knowledge in high-performance alloy steels for critical applications
- API Q1 Certification: Manufacturing processes certified to API Q1 quality management system
- AMS 2750 Compliant Heat Treatment: Heat treatment furnaces calibrated to AMS 2750 standards, ensuring precise temperature control
- QTC Testing Qualification: Our Quench, Temper, and Control procedures are qualified according to industry specifications
- CNSA Verification: Each production batch undergoes independent testing by the China National Standards Association
- Large Section Capability: Expertise in producing and heat treating large diameter material with consistent properties
- Technical Support: Comprehensive metallurgical and application engineering assistance
- Supply Chain Reliability: Global sourcing capabilities ensure stable supply and competitive pricing
- Custom Solutions: Ability to tailor chemical composition and processing to meet specific customer requirements
- Complete Traceability: Full documentation from melt to final inspection
Request Information
Contact SHUNFU METAL today to discuss your AISI 4330Vmod steel requirements. Our technical team is ready to assist you with:
- Detailed technical specifications
- Material selection guidance
- Custom size and property requirements
- Price quotations and delivery schedules
- Quality certification and documentation
- Technical support for your application
We are committed to integrate steel resources in china and serve the global steel market. Our company has more than 15 years of experience in steel researching, production, managing and sales. And our team mostly are based on and worked in national famous steel enterprise before. In the aspect of resources and information, we have established cooperative relationship with nearly hundred enterprises, either state-owned or private owned in China.
What’s more, we have built long, deep and close business relationship with dozens of steel company, Sharing and holding equities with several steel enterprises. Because of the close cooperation with steel companies and our pioneering spirit, which can ensure us stay at the top competition, and ensure our customers get what they really want. We provide preffesional one-stop service to the Contractors of follows project:
- Oil and Gas Pipeline Construction
- Onshore and Offshore
- Boiler Manufacturers
- Oil Refining Equipment
- Petroleum and Chemical Plant Construction
- Fire Protection
- Heating & Air Conditioning
Our ability to purchase materials directly from leading mills at the best possible price will give you the competitive edge. This coupled with a skilled workforce dedicated to embracing the demands of the markets we serve. Just give us a call +86-731-89903933.
