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AISI 4330V Steel Hollow Bar

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AISI 4330V Steel Hollow Bar2026-04-28T09:02:55+00:00

Project Description

AISI 4330V Hollow Bar

AISI 4330V is a premium high-strength Nickel-Chromium-Molybdenum (NiCrMo) alloy steel, enhanced with Vanadium for exceptional impact toughness and fatigue resistance. As a specialized manufacturer serving the global Oil & Gas and Mining industries, ShunFu Metal produces this quenched and tempered borehole hollow bar to withstand the most demanding deep-drilling environments. Backed by our API Q1 and ISO 9001 certifications, and trusted by the world's top 10 oilfield service companies across 50+ countries, we ensure every hollow bar delivers superior strength-to-weight ratios and uncompromising material integrity for your critical downhole applications.

AISI 4330V quenched and tempered hollow bar made by ShunFu Metal for downhole drilling tools
ShunFu Metal AISI 4330V borehole hollow bar with precise ID/OD ratios

Equivalent Grades

Regional equivalent designations for AISI 4330V
Standard / Region Equivalent Grade / Designation
USA (AISI/SAE) 4330V / 4330 Mod
UNS K23080 (Modified)
Europe (EN) 30CrNiMo8 (Approximate equivalent)

Applications

  • Drilling Jars & Shock Tools (Oil & Gas / Drilling): Supplied by ShunFu Metal as precision-machined borehole hollow bars with tightly controlled ID/OD ratios. Our hollow bars provide the exceptional fatigue resistance needed to absorb severe drilling vibrations.
  • Hollow Drill Collars & MWD/LWD Housings (Oil & Gas): Delivered as quenched and tempered hollow sections. ShunFu Metal’s API-calibrated heat treatment ensures uniform through-wall properties, providing a high-strength protective casing for sensitive Measurement/Logging While Drilling equipment. See our hollow drill collar expertise.
  • High-Pressure Fluid Handling Components (Mining / Oil & Gas): Supplied as forged round bars or pre-drilled hollow bars. ShunFu Metal utilizes advanced BTA deep hole drilling to guarantee smooth internal passages, reducing pressure drops in fluid systems.
  • Crossover Subs & Stabilizer Bodies (Drilling): Provided as custom-cut hollow bars or precision-turned blanks. We leverage our in-house CNC lathe capabilities to meet exact dimensional tolerances for immediate downstream thread cutting and assembly, compatible with our drill pipe range.

Specifications & Standards

ShunFu Metal strictly organizes production according to these international standards and can issue corresponding EN 10204 3.1 material test certificates tailored to your specific project requirements.

  • 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

Available Sizes & Delivery

ShunFu Metal offers flexible size ranges for AISI 4330V, including rolled/forged round bars, flat bars, and specialized borehole hollow bars. Our hollow bars are available in Outside Diameters (OD) from 1″ to 12″ (25.4mm–304.8mm) and lengths up to 12 meters. Leveraging our high forging ratio capabilities for optimal grain structure, API-compliant heat treatment, and advanced BTA deep hole drilling, we deliver premium customized dimensions.

Delivery & MOQ

  • Ready Stock: Common sizes available for immediate dispatch (MOQ: 1 piece, delivery ~7 days).
  • Custom Forgings/Rolled Bars: Standard production runs (MOQ: 3 tons, delivery ~30 days).
  • Small Batch Special Melts: Utilizing our specialized induction furnaces, we can accommodate custom chemistry tweaks (MOQ: 3–5 tons).
  • Large Volume Orders: Processed via our 30–60 ton EAF for rapid, high-capacity fulfillment.

Chemical Composition

ShunFu Metal verifies the chemical composition of every heat through rigorous in-house spectrometry. Our advanced melt shop controls ensure ultra-low sulfur levels, and we can fine-tune specific alloying elements to meet your exact mechanical performance requirements.

Chemical composition requirements for AISI 4330V (weight %)
Element Minimum (%) Maximum (%)
Carbon (C)0.280.33
Silicon (Si)0.200.30
Manganese (Mn)0.751.00
Phosphorus (P)–0.015
Sulfur (S)–0.0015 (Ultra-Clean)
Chromium (Cr)0.751.00
Molybdenum (Mo)0.350.50
Nickel (Ni)1.652.00
Aluminum (Al)0.0150.035
Vanadium (V)0.050.10

Melting & Processing

ShunFu Metal offers customizable melting routes. Our standard process utilizes EAF + LF + VD. For higher purity, we provide ESR or PESR. For extreme demands, VIM + VAR is available. (AOD is utilized for stainless/nickel alloys). We tailor the metallurgical process to your application's criticality.

Mechanical Properties

ShunFu Metal issues comprehensive mechanical testing reports from accredited laboratories prior to delivery. All yield, tensile, hardness, and impact data are fully traceable to the specific heat and batch numbers, with testing performed at the mid-wall location to guarantee through-thickness integrity.

Typical mechanical properties for AISI 4330V hollow bar variants
Property 135ksi Variant 150ksi Variant 155ksi Variant
0.2% Yield Strength (Min)135 ksi (931 MPa)150 ksi (1,034 MPa)155 ksi (1,069 MPa)
Ultimate Tensile Strength (Min)145 ksi (1,000 MPa)160 ksi (1,103 MPa)165 ksi (1,138 MPa)
Elongation (Min)14%14%14%
Reduction of Area (Min)50%45%45%
Hardness (HRC)30 – 3634 – 4034 – 40
Hardness (HBW)286 – 341319 – 371319 – 371
Charpy V-Notch @ 23°C (Avg)65 J (48 ft-lb)54 J (40 ft-lb)54 J (40 ft-lb)
Charpy V-Notch (Low Temp Avg)50 J @ -40°C32 J @ -20°C27 J @ -20°C

Heat Treatment

ShunFu Metal’s heat treatment furnaces are rigorously and periodically calibrated in strict compliance with API and AMS 2750 standards. This ensures absolute temperature uniformity and process repeatability, guaranteeing that every AISI 4330V hollow bar achieves consistent, reliable mechanical properties without core degradation.

Heat treatment processes applied to AISI 4330V hollow sections
Process Details & Parameters
AustenitizingModified heating cycles specifically designed for hollow sections to ensure uniform through-wall temperature.
QuenchingAdvanced quenching techniques utilizing both internal and external cooling to achieve uniform properties across the wall thickness.
TemperingComputer-controlled precision tempering with modified parameters tailored for hollow sections.
Stress Relief / NormalizingAdditional stress relief or normalizing processes available for larger sizes to optimize grain structure, depending on customer requirements.

Surface Finish & Machining

ShunFu Metal leverages in-house precision machining equipment to deliver AISI 4330V hollow bars in Peeled, Smooth Turned, or Black finishes. Utilizing our advanced BTA boring, long-distance gunhole drilling, and CNC lathes, we achieve precise ID/OD ratios and exceptional straightness tolerances (1mm in 500mm). For critical fatigue applications, we offer roller burnishing and shot peening to enhance surface integrity. By keeping milling, turning, and grinding processes in-house, we guarantee factory-direct quality control, ensuring your hollow bars arrive with the exact surface roughness (Ra) required for immediate downstream manufacturing.

Quality Assurance & Inspection

ShunFu Metal implements rigorous quality control at every production stage. As an API Q1 and ISO 9001 certified manufacturer, we guarantee uncompromising integrity for every AISI 4330V hollow bar. Our in-house testing includes 100% Ultrasonic Testing (UT) in accordance with ASTM A388 and API 6A PSL 3&4 standards, chemical analysis, dimensional verification, and metallographic examination confirming ASTM 5 or finer grain size. We perform specialized four-quadrant hardness testing and mid-wall mechanical testing to verify through-thickness uniformity. Products are supplied with EN 10204 3.1 certification, and we routinely coordinate with SGS or TÜV for 3.2 third-party inspections.

Packing & Shipping

Drawing on our experience exporting to over 50 countries, ShunFu Metal ensures secure transit. Black-finish products are tightly wire-bundled. Precision-machined hollow bars receive multi-layer protective wrapping and premium anti-rust oil coating, guaranteeing corrosion-free delivery across global ocean freight routes while matching your destination port's exact documentation requirements.

Frequently Asked Questions

Can ShunFu Metal supply AISI 4330V hollow bars to API 6A and API Spec 7 specifications?
Yes. ShunFu Metal is an API Q1 certified manufacturer. Our melting, AMS 2750-compliant heat treatment, and 100% UT inspection processes are strictly controlled to meet and exceed API 6A (PSL 3&4) and API Spec 7 requirements for critical downhole tools.
What is the minimum order quantity for AISI 4330V borehole hollow bars?
For standard sizes in our ready stock, we support orders as small as 1 piece with a 7-day delivery. For custom dimensions or specific ID/OD ratios requiring our BTA deep hole drilling, the MOQ is typically 3 tons. We also offer 3–5 ton custom melts using our specialized induction furnaces.
How does ShunFu Metal ensure uniform properties through the wall of the hollow bar?
We utilize specialized internal and external quenching techniques in our API-calibrated furnaces. Combined with our high forging reduction ratios and mid-wall mechanical testing, we guarantee consistent yield strength and exceptional impact toughness from the outer diameter all the way to the inner bore.
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