Project Description
AISI 4330V — Premium Quenched & Tempered Borehole Hollow Bar
Product Description
SHUNFU METAL offers premium AISI 4330V quenched and tempered borehole hollow bar, a specialized high-strength Nickel-Chromium-Molybdenum (NiCrMo) alloy steel with Vanadium enhancement. Engineered specifically for demanding oil and gas drilling applications, our AISI 4330V hollow bar combines exceptional strength with outstanding impact toughness and excellent fatigue resistance. The hollow bar configuration provides weight reduction, improved torque transmission, and enables fluid passage through the center bore—critical advantages for deep drilling operations.
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. Our quenched and tempered borehole hollow bars undergo comprehensive testing by CNSA (China National Standards Association) to verify compliance with international standards. Available in multiple strength variants (135ksi, 150ksi, and 155ksi), our AISI 4330V hollow bars provide the optimal combination of properties for drilling jars, shock tools, drill collars, and other critical downhole tools where superior strength-to-weight ratio and exceptional toughness are essential for reliable performance in challenging environments.
Key Advantages of AISI 4330V Quenched & Tempered Borehole Hollow Bar
- Optimized Hollow Design: Engineered with precision-controlled ID/OD ratio for optimal balance of strength and weight reduction
- Superior Strength-to-Weight Ratio: Hollow configuration provides significant weight savings while maintaining excellent mechanical properties
- Exceptional Impact Toughness: Outstanding impact properties at low temperatures due to optimized alloy content and controlled heat treatment
- Enhanced Fatigue Resistance: Vanadium modification improves fatigue life in cyclic loading applications
- Excellent Through-Wall Properties: Controlled chemistry and optimized heat treatment ensure consistent properties from outer to inner surfaces
- Ultra-Clean Steel: Extremely low sulfur content (≤0.0015%) for superior toughness and resistance to inclusion-initiated fatigue failures
- Multiple Strength Variants: Available in 135ksi, 150ksi, and 155ksi yield strength versions to suit specific application requirements
- Precise Dimensional Control: Tight tolerances on ID, OD, and straightness for optimal performance in dynamic drilling environments
- 100% Ultrasonic Testing: Complete quality verification with ASTM A388 ultrasonic inspection to API 6A PSL 3&4 standards
- CNSA Verification: Each batch independently tested by China National Standards Association
Chemical Composition
SHUNFU METAL’s AISI 4330V steel features a carefully controlled chemistry for optimal performance in hollow bar configurations:
| Element | Minimum % | Maximum % |
|---|---|---|
| Carbon (C) | 0.28 | 0.33 |
| Silicon (Si) | 0.20 | 0.30 |
| Manganese (Mn) | 0.75 | 1.00 |
| Phosphorus (P) | – | 0.015 |
| Sulfur (S) | – | 0.0015 |
| Chromium (Cr) | 0.75 | 1.00 |
| Molybdenum (Mo) | 0.35 | 0.50 |
| Nickel (Ni) | 1.65 | 2.00 |
| Aluminum (Al) | 0.015 | 0.035 |
| Vanadium (V) | 0.05 | 0.10 |
Role of Key Alloying Elements in Hollow Bar Performance
- Nickel (1.65-2.00%): Provides exceptional toughness, especially at low temperatures, and enhances hardenability through the full wall thickness
- Chromium (0.75-1.00%): Improves hardenability and wear resistance while contributing to overall strength
- Molybdenum (0.35-0.50%): 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 in hollow configurations
- Carbon (0.28-0.33%): Carefully controlled to optimize strength while maintaining excellent toughness across the hollow section
- Ultra-Low Sulfur (≤0.0015%): Significantly improves transverse properties and fatigue resistance by minimizing inclusion content
Mechanical Properties
SHUNFU METAL offers AISI 4330V quenched and tempered borehole hollow bar in three standard strength variants to meet different application requirements:
135ksi Variant
Optimized for applications requiring excellent toughness with high strength:
| Property | Minimum | Maximum |
|---|---|---|
| 0.2% Yield Strength (Proof Stress) | 135 ksi (931 MPa) | – |
| Ultimate Tensile Strength (UTS) | 145 ksi (1,000 MPa) | – |
| Elongation | 14% | – |
| Reduction of Area | 50% | – |
| Hardness (HRC) | 30 | 36 |
| Hardness (HBW) | 286 | 341 |
Impact Properties (135ksi Variant)
| Test Temperature | Average Value | Minimum Single Value |
|---|---|---|
| Charpy V-Notch @ 23°C (73°F) | 65 J (48 ft-lb) | – |
| Charpy V-Notch @ -40°C (-40°F) | 50 J (37 ft-lb) | – |
150ksi Variant
Designed for applications requiring higher strength with good toughness:
| Property | Minimum | Maximum |
|---|---|---|
| 0.2% Yield Strength (Proof Stress) | 150 ksi (1,034 MPa) | – |
| Ultimate Tensile Strength (UTS) | 160 ksi (1,103 MPa) | – |
| Elongation | 14% | – |
| Reduction of Area | 45% | – |
| Hardness (HRC) | 34 | 40 |
| Hardness (HBW) | 319 | 371 |
Impact Properties (150ksi Variant)
| Test Temperature | Average Value | Minimum Single Value |
|---|---|---|
| Charpy V-Notch @ 23°C (73°F) | 54 J (40 ft-lb) | – |
| Charpy V-Notch @ -20°C (-4°F) | 32 J (24 ft-lb) | 30 J (22 ft-lb) |
155ksi Variant
Engineered for maximum strength applications:
| Property | Minimum | Maximum |
|---|---|---|
| 0.2% Yield Strength (Proof Stress) | 155 ksi (1,069 MPa) | – |
| Ultimate Tensile Strength (UTS) | 165 ksi (1,138 MPa) | – |
| Elongation | 14% | – |
| Reduction of Area | 45% | – |
| Hardness (HRC) | 34 | 40 |
| Hardness (HBW) | 319 | 371 |
Impact Properties (155ksi Variant)
| Test Temperature | Average Value | Minimum Single Value |
|---|---|---|
| Charpy V-Notch @ 23°C (73°F) | 54 J (40 ft-lb) | – |
| Charpy V-Notch @ -20°C (-4°F) | 27 J (20 ft-lb) | 20 J (15 ft-lb) |
Note: Properties are verified on mid-radial location for 1-10″ sizes and at 1″ below surface for 10-12.5″ sizes. For hollow bars, testing is performed at the mid-wall location.
Specialized Manufacturing Process for Borehole Hollow Bar
SHUNFU METAL’s AISI 4330V quenched and tempered borehole hollow bar undergoes a specialized manufacturing process to ensure premium quality and consistent properties:
Advanced Steel Production
- Premium Melting: Electric Arc Furnace (EAF) with precise chemistry control and enhanced desulfurization
- Advanced Ladle Refining: Extended refining for superior cleanliness and tight compositional control
- Extended Vacuum Degassing: Comprehensive degassing to achieve ultra-low hydrogen content (< 2 ppm)
- Controlled Casting: Either bottom-poured wide end up ingots or continuously cast, depending on product requirements
- Enhanced Reduction Ratio: Minimum 4:1 reduction ratio to ensure optimum grain flow and mechanical properties
Hollow Bar Processing
- Precision Boring: Advanced gun drilling or trepanning to create the central bore with precise dimensional control
- Surface Inspection: 100% inspection of internal and external surfaces
- ID/OD Optimization: Carefully controlled wall thickness for optimal mechanical properties
- Straightening: Specialized straightening process to achieve excellent concentricity and straightness
Specialized Heat Treatment for Hollow Sections
- AMS 2750 Certified Furnaces: All heat treatment performed in calibrated furnaces with precise temperature control
- Optimized Austenitizing: Modified heating cycles specifically designed for hollow sections to ensure uniform through-wall temperature
- Specialized Quenching: Advanced quenching techniques with internal and external cooling to achieve uniform properties across the wall
- Precision Tempering: Computer-controlled tempering with modified parameters for hollow sections
- Stress Relief: Available with additional stress relief treatment depending on customer requirements
- Normalization: May include normalizing process for larger sizes to optimize grain structure
Comprehensive Quality Assurance for Hollow Bar
- 100% Ultrasonic Testing: Advanced UT techniques for both ID and OD surfaces to API 6A PSL 3&4 standards
- CNSA Verification: Each batch undergoes independent testing by China National Standards Association
- Microstructural Examination: Verification of grain size (ASTM 5 or finer) and proper microstructure through the full wall thickness
- Mid-Wall Testing: Mechanical testing from mid-wall locations to verify through-thickness properties
- Dimensional Verification: Comprehensive checking of ID, OD, concentricity, and straightness
- API Q1 Certified: All manufacturing processes comply with API Q1 quality management system
- QTC Testing: Specialized Quench, Temper, and Control procedures for hollow bar configurations
Applications for AISI 4330V Quenched & Tempered Borehole Hollow Bar
SHUNFU METAL’s AISI 4330V hollow bar is specifically engineered for critical applications in oil and gas drilling operations:
Downhole Drilling Tools
- Drilling Jars: Critical tools that deliver impact force to free stuck drill strings
- Shock Tools: Components that absorb and dampen drilling vibrations
- Hollow Drill Collars: Heavy-walled tubular components with internal fluid passage
- MWD/LWD Housings: Protective casings for Measurement/Logging While Drilling equipment
- Stabilizer Bodies: Components that maintain drill string alignment while allowing fluid passage
- Crossover Subs: Transition components connecting different thread types with internal flow path
- Rotary Steerable System Components: Parts for directional drilling systems
Other Specialized Applications
- High-Pressure Fluid Handling Systems: Components requiring strength and internal fluid passage
- Torque Transmission Shafts: Hollow drive shafts with optimal strength-to-weight ratio
- Subsea Equipment Components: Critical parts requiring both strength and fluid flow capability
- Hydraulic Cylinders: High-pressure applications requiring superior fatigue resistance
- Heavy Equipment Components: Weight-optimized structural parts
Specifications and Compliance
SHUNFU METAL’s AISI 4330V quenched and tempered borehole hollow bar meets or exceeds the following specifications:
- API Spec 7: Specification for Drill Stem Elements
- API 6A: Specification for Wellhead and Tree Equipment
- ASTM A29/A29M: Standard Specification for Steel Bars, Carbon and Alloy, Hot-Wrought
- ASTM A519: Standard Specification for Seamless Carbon and Alloy Steel Mechanical Tubing
- AMS 2301: Steel Cleanliness, Aircraft Quality
- AMS 2750: Pyrometry – heat treatment furnace requirements
Certifications
- API Q1: American Petroleum Institute Quality Management System
- ISO 9001: Quality Management System
- CNSA: China National Standards Association verification
- API 6A PSL 3&4: Product Specification Level for critical service
Product Forms and Sizes
SHUNFU METAL offers AISI 4330V quenched and tempered borehole hollow bar in the following configurations:
Standard Hollow Bar Dimensions
- Outside Diameter Range: 1″ to 12″ (25.4mm to 304.8mm)
- Wall Thickness Options: Various wall thicknesses available to optimize strength-to-weight ratio
- ID/OD Ratios: Customizable to application requirements
- Length: Up to 40 feet (12 meters) in standard offerings, custom lengths available
- Surface Condition: Peeled, Smooth Turned, or Black finish
- Straightness: 1mm in 500mm (1/8″ in 5″), enhanced straightness available
Strength Variants
- 135ksi Variant: Optimized for maximum toughness applications
- 150ksi Variant: Balanced strength and toughness
- 155ksi Variant: Designed for maximum strength requirements
Machining Tolerances
For ‘Machining Quality Bar’ to ASTM A29 Tolerances, the minimum machining allowance is as follows:
| Ordered Surface Condition | Minimum Stock Removal |
|---|---|
| Peeled/Smooth Turned | 1% per side |
| Black | 1.6% per side |
Note: For hollow bars larger than 10.25″ (260.4mm) outside diameter, the central 20% of the wall will be excluded from ultrasonic testing.
Advantages of Hollow Bar vs. Solid Bar
Understanding the benefits of AISI 4330V quenched and tempered borehole hollow bar compared to solid bar:
| Performance Characteristic | Solid Bar | Hollow Bar Advantage |
|---|---|---|
| Weight | Higher | 15-40% weight reduction depending on ID/OD ratio |
| Fluid Flow Capability | None | Internal passage for drilling fluids, reducing pressure drop |
| Hardenability | Core may have reduced properties | More uniform through-wall properties due to internal and external quenching |
| Inspection Access | Limited to OD | Both ID and OD can be inspected for defects |
| Torsional Strength-to-Weight | Standard | Superior torsional strength relative to weight |
| Signal/Wire Accommodation | None | Can accommodate electrical wires or signal cables through center |
| Manufacturing Complexity | Lower | Higher (reflected in cost) |
Technical Support and Services
SHUNFU METAL provides comprehensive technical support to help customers maximize the performance of our AISI 4330V quenched and tempered borehole hollow bar:
- Hollow Bar Design Optimization: Expert assistance in selecting the optimal ID/OD ratio and strength variant for specific applications
- FEA Analysis Support: Finite Element Analysis assistance for critical applications
- Metallurgical Consultation: Expert advice on material selection and performance optimization
- Failure Analysis: Investigation and root cause analysis of material-related issues
- Custom Testing: Additional mechanical, chemical, or metallurgical testing as required
- Connection Design Support: Technical guidance on thread design and connection integrity
- Field Performance Tracking: Collaborative monitoring of material performance in actual service
- Enhanced Documentation: Comprehensive certification packages including detailed processing history
Why Choose SHUNFU METAL for AISI 4330V Quenched & Tempered Borehole Hollow Bar
Selecting SHUNFU METAL as your supplier for AISI 4330V hollow bar provides numerous advantages:
- Specialized Hollow Bar Expertise: Dedicated manufacturing capabilities and technical know-how specifically for hollow bar production
- 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, with specialized protocols for hollow sections
- 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
- Advanced Hollow Bar Testing: Comprehensive testing including mid-wall property verification
- Technical Expertise: Our metallurgists and engineers have extensive experience with high-strength alloy hollow bars for oil and gas applications
- Supply Chain Reliability: Global sourcing capabilities ensure stable supply and competitive pricing
- Custom Solutions: Ability to tailor hollow bar dimensions and properties to meet specific customer requirements
- Complete Traceability: Full documentation from melt to final inspection for every hollow bar
Request Information
Contact SHUNFU METAL today to discuss your AISI 4330V quenched and tempered borehole hollow bar requirements. Our technical team is ready to assist you with:
- Detailed technical specifications
- Hollow bar design optimization
- 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.
