AISI 4330Vmod is a premium through-hardening Nickel-Chromium-Molybdenum-Vanadium (NiCrMoV) alloy steel, engineered for exceptional strength, toughness, and fatigue resistance in large cross-sections. The elevated nickel and vanadium content ensures superior hardenability and impact resistance under extreme stress. At ShunFu Metal, we specialize in manufacturing this high-performance grade specifically for the demanding oil & gas and mining sectors.
Applications
AISI 4330Vmod is the material of choice for high-stress components in Oil & Gas, Mining, and Drilling engineering. ShunFu Metal supplies this grade tailored to specific downstream manufacturing needs:
- Drill Collar Blanks & Drill Jars (Oil & Gas): Supplied by ShunFu Metal as precision-machined hollow bars, utilizing our in-house BTA deep hole boring equipment to deliver ready-to-finish components.
- Drill Subs & Crossovers (Drilling): Delivered as high-ratio forged round bars, fully quenched and tempered in our API-calibrated furnaces to guarantee a minimum 150 ksi yield strength. Explore our range of drill pipe products.
- Downhole Motor Components (Oil & Gas): Provided as bright-turned round bars with tight CNC machining tolerances, ensuring perfect concentricity for directional drilling systems.
- Heavy-Wall Power Transmission Shafts (Mining): Supplied as large-diameter custom forgings, heat-treated by ShunFu Metal to achieve uniform through-hardness and exceptional fatigue resistance in heavy machinery.
Specifications & Standards
ShunFu Metal strictly organizes production according to the following international standards and can issue comprehensive material test certificates corresponding to each specification upon customer request.
- 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
Available Sizes & Delivery
ShunFu Metal offers highly flexible sizing for AISI 4330Vmod, including forged and rolled round bars (25mm to 500mm diameter), flat bars, and precision-bored hollow bars. Our advanced forging facilities guarantee a minimum 4:1 reduction ratio for optimal grain structure. Combined with our API-compliant heat treatment furnaces and state-of-the-art machining center—featuring BTA deep hole drilling, CNC lathes, and long-distance gunhole drilling—we deliver exact dimensions tailored to your project.
Delivery & MOQ
- Ready Stock: Common sizes are available in our 20,000 sq.m warehouse for immediate dispatch. MOQ is 1 piece, with delivery in ~7 days.
- Custom Forgings/Rolled Bars: Standard custom production requires a 3-ton MOQ with a ~30-day lead time.
- Small Batch Special Melts: Utilizing our small induction furnaces, we can accommodate custom chemistry modifications starting at just 3–5 tons.
- Large Volume Orders: Processed via our 30–60 ton EAF route for rapid, high-tonnage fulfillment.
Chemical Composition
ShunFu Metal strictly controls this chemistry through rigorous in-house spectrometry and advanced ladle refining. We conduct real-time melt shop analysis to verify that every heat perfectly aligns with specification, and we can micro-alloy or adjust specific elements to meet your exact hardenability requirements.
| 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 |
*Note: ShunFu Metal can modify Nickel content up to 3.00% upon request to ensure greater hardenability for ultra-large sections.
Melting & Processing
ShunFu Metal offers tailored melting routes: our standard EAF + LF + VD ensures ultra-clean steel. For stricter requirements, we provide ESR or PESR. For ultimate purity, VIM + VAR is available. Customers can consult our metallurgical engineers to select the optimal melting process for their specific application.
Mechanical Properties
ShunFu Metal provides comprehensive mechanical property test reports from our accredited laboratory prior to every delivery. All yield, tensile, and impact data is fully traceable to the specific heat and batch number, ensuring absolute reliability for your critical components.
Quenched & Tempered Condition (150mm / 6″ Diameter)
| Property | Minimum | Maximum |
|---|---|---|
| 0.2% Yield Strength | 150 ksi (1,034 MPa) | – |
| Ultimate Tensile Strength | 165 ksi (1,138 MPa) | – |
| Elongation | 15% | – |
| Reduction of Area | 50% | – |
| Hardness (HB) | 341 | 372 |
| Charpy V-Notch (Room Temp) | 54 J (40 ft-lb) | – |
| Charpy V-Notch (-20°C / -4°F) | 40 J (30 ft-lb) | – |
Quenched & Tempered Condition (320mm / 12.6″ Diameter)
| Property | Minimum | Maximum |
|---|---|---|
| 0.2% Yield Strength | 150 ksi (1,034 MPa) | – |
| Ultimate Tensile Strength | 160 ksi (1,103 MPa) | – |
| Elongation | 13% | – |
| Reduction of Area | 35% | – |
| Hardness (HB) | 319 | 390 |
| Charpy V-Notch (Room Temp) | 54 J (40 ft-lb) | – |
Heat Treatment
ShunFu Metal’s heat treatment facility utilizes furnaces that are strictly calibrated to API and AMS 2750 standards. This guarantees exceptional temperature uniformity and process repeatability, ensuring our AISI 4330Vmod consistently achieves its targeted through-hardness and 150 ksi yield strength without compromise.
| Process | Temperature Range | Cooling Method |
|---|---|---|
| Normalizing | 870–900°C (1600–1650°F) | Air cool |
| Annealing | 830–850°C (1525–1560°F) | Slow furnace cool |
| Hardening (Austenitizing) | 830–870°C (1525–1600°F) | Oil or polymer quench |
| Tempering | 540–650°C (1000–1200°F) | Air cool (depending on target strength) |
| Stress Relieving (Post-Weld) | 550–600°C (1020–1110°F) | Air or furnace cool |
Surface Finish & Machining
Leveraging our in-house precision machining capabilities, ShunFu Metal supplies AISI 4330Vmod in various surface conditions, from as-forged to highly finished components. We offer Turning, Grinding, and Milling to achieve tight dimensional tolerances (down to ±0.125mm) and superior surface roughness. For complex downhole tools, our advanced CNC Lathes, BTA Boring, and Long Distance Gunhole Drilling equipment produce precise hollow bars and internal profiles. We also provide Roller Burnishing and Shot Peening to enhance surface fatigue resistance. By keeping all machining factory-direct, we guarantee strict quality control and ready-to-use components.
Quality Assurance & Inspection
ShunFu Metal implements a rigorous QA process at every production stage. We perform 100% Ultrasonic Testing (UT) per ASTM A388, alongside chemical analysis, dimensional checks, and metallographic examination. Crucially, we conduct four-quadrant hardness testing to verify uniform through-hardening in large sections. As an API Q1 and ISO 9001 certified manufacturer, our quality system guarantees that every 4330Vmod product meets oilfield safety standards. We provide EN 10204 3.1 certificates standard (3.2 upon request) and welcome third-party inspections from SGS or TÜV.
Packing & Shipping
With experience exporting to over 50 countries, ShunFu Metal ensures secure transit. Black surface bars are tightly wire-bundled to prevent transit damage. Bright and precision-machined products receive multi-layer protective wrapping to safeguard surface roughness and dimensional accuracy. All materials are coated with premium anti-rust oil, guaranteeing they arrive corrosion-free after long-distance ocean freight.
Frequently Asked Questions
Can ShunFu Metal supply AISI 4330Vmod to API Spec 7 requirements?
Yes. As an API Q1 certified manufacturer, ShunFu Metal produces 4330Vmod fully compliant with API Spec 7. Our in-house melting, high-ratio forging, and calibrated heat treatments ensure the material meets all mechanical and testing requirements for critical drill stem elements.
What is the minimum order quantity for 4330Vmod custom forgings?
For custom forged round bars or specific profiles, our standard MOQ is 3 tons with a lead time of roughly 30 days. However, if you require a specialized chemical modification, our small induction furnaces allow us to melt custom batches starting at just 3–5 tons.
How do you ensure uniform hardness in large-diameter 4330Vmod bars?
ShunFu Metal ensures through-hardenability by tightly controlling the Nickel and Molybdenum content during the melting phase. We then utilize AMS 2750 calibrated heat treatment furnaces for precise, uniform quenching and tempering, followed by strict four-quadrant hardness testing and mid-radius mechanical testing to verify structural uniformity.
Can you provide pre-machined hollow bars for drill collars?
Absolutely. We specialize in supplying ready-to-finish drill collar hollow bars. Utilizing our advanced BTA deep hole drilling and long-distance gunhole drilling equipment, we can bore solid 4330Vmod forged bars to your exact internal diameter specifications, saving you significant machining time and material waste.
Ready to Source AISI 4330Vmod?
Contact our engineering sales team for a competitive quote and detailed material certificate.
Need AISI 4330V MOD to the specification above?
Send the size, condition, quantity and any NACE or PMI requirements — we reply with mill availability, lead time and a priced offer, usually within one working day.