4330V MOD Round Bars – High Strength Alloy Steel for Critical Forging Applications
4330V MOD round bars are premium-grade alloy steel products designed for highly stressed and safety-critical applications. This grade is a vanadium-modified version of AISI 4330 alloy steel, developed to deliver superior toughness, fatigue resistance, and strength in extreme operating conditions.
We supply AISI 4330V Mod round bars and forged products to industries such as oil & gas, offshore drilling, power generation, heavy engineering, and mining—where material failure is not an option. Because of their proven performance, SAE 4330V alloy steel round bars are widely used for drill collars, drill jars, forged shafts, gears, rolled rings, and hollow bars.
What Is AISI 4330V MOD Alloy Steel?
AISI 4330V MOD alloy steel is a low-alloy nickel-chromium-molybdenum steel enhanced with vanadium (V). The vanadium addition refines the grain structure, improves cleanliness, and significantly increases fatigue life and fracture toughness compared to standard 4330 grades.
Why Vanadium Matters
From real industrial use, vanadium helps:
- Improve impact strength
- Increase resistance to crack propagation
- Enhance performance in thick cross-sections
- Maintain strength without becoming brittle
This is why 4330V alloy bars are preferred for demanding forging applications.
4330V MOD Round Bars – Product Range
We supply AISI 4330V forging round bars in multiple sizes, finishes, and heat-treated conditions to meet project-specific requirements.
Available Forms
- 4330V MOD round bars
- 4330V rods
- Alloy Steel 4330 round bars
- Astralloy 4330 V-Mod alloy steel round bars
- AISI 4330V MOD alloy steel hollow bars
- Flat bars
- Forging stock for machining
AISI 4330V Forged Rings & Rolled Rings
AISI 4330V forged rings and AISI 4330V rolled rings provide uniform strength and excellent fatigue resistance. Typical Uses:
- Bearing rings
- Gear blanks
- Pressure vessels
- Structural ring components
AISI 4330V Drill Jars & Drill Collar Forgings
In drilling operations, AISI 4330V drill jar forging parts and AISI 4330V drill collar forgings perform reliably under extreme torsional and tensile loads. Benefits:
- High impact resistance
- Reduced risk of fatigue failure
- Excellent downhole performance
- Long operational life
4330V Reamers Forgings
4330V reamers forgings are widely used in drilling tools due to their strength, wear resistance, and shock-absorbing capability.
AISI 4330V Forged Disks, Gears & Shafts
- AISI 4330V forged disks – Used in turbines, compressors, and pressure systems
- AISI 4330V forging gears – Ideal for heavy-load transmission
- AISI 4330V forging shafts – Designed for high-torque applications
Specifications of AISI 4330V MOD Round Bars
| Parameter | Details |
| Standard | ASTM A29 / ASTM A322 |
| Grade | AISI 4330V MOD / SAE 4330V |
| UNS Number | K13330 (Modified) |
| Form | Round Bars, Rods, Hollow Bars, Forging Stock |
| Size Range | 20 mm to 800 mm (custom sizes available) |
| Length | Random / Cut to Length |
| Surface Finish | Black, Rough Turned, Peeled, Polished |
| Heat Treatment | Annealed, Normalized, Quenched & Tempered |
| Testing | UT, MPI, Mechanical & Chemical Testing |
| Application | Forgings, Drill Collars, Shafts, Gears, Rings |
Chemical Composition of SAE 4330V alloy steel round bars
| Element | Composition (%) |
| Carbon (C) | 0.28 – 0.33 |
| Manganese (Mn) | 0.60 – 0.80 |
| Silicon (Si) | 0.15 – 0.35 |
| Chromium (Cr) | 0.75 – 1.00 |
| Nickel (Ni) | 1.65 – 2.00 |
| Molybdenum (Mo) | 0.20 – 0.30 |
| Vanadium (V) | 0.05 – 0.10 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.025 |
Mechanical Properties of AISI 4330V Forged Rings
| Property | Typical Value |
| Tensile Strength | 930 – 1100 MPa |
| Yield Strength (0.2%) | 760 – 900 MPa |
| Elongation | ≥ 14% |
| Reduction of Area | ≥ 45% |
| Impact Toughness (Charpy V) | Excellent at low temperatures |
| Hardness | 28 – 36 HRC (as required) |
4330V Modified Forging Parts – Industrial Applications
4330V modified forging parts are used in applications where long service life and structural integrity are critical.
Common Applications
- Oil & gas drilling equipment
- Offshore platforms
- Heavy mechanical assemblies
- Power transmission systems
- Mining and earthmoving equipment
AISI 4330V MOD Alloy Steel Hollow Bars
AISI 4330V MOD alloy steel hollow bars reduce machining time and material waste while maintaining excellent mechanical integrity. Advantages:
- Lower machining cost
- Better material utilization
- Ideal for thick-walled components
- Excellent fatigue performance
Why Choose 4330V Alloy Flat Bars Stockist & Suppliers?
From hands-on industry experience, 4330V alloy bar consistently outperforms standard alloy steels in high-stress environments. Key Benefits:
- High strength with excellent toughness
- Superior fatigue resistance
- Reliable performance in large sections
- Consistent metallurgical quality
- Trusted for critical forgings
Along with round bars, we act as AISI 4330V round bars, flat bar stockists & suppliers, offering forged and cut-to-size material as per drawings. 4330V MOD round bars are the preferred choice for critical forging and machining applications where strength, toughness, and reliability are essential. Whether used as forging stock, rolled rings, drill collars, shafts, or gears, SAE 4330V alloy steel round bars deliver dependable performance in the most demanding conditions.
Global Reach
ASC LLP boasts a robust global presence, committed to delivering unparalleled service and quality to clients around the world. Our dedication to prompt delivery and exceptional customer care sets us apart in the industry. Major corporations across the USA, Europe, Asia, and other regions place their trust in our high-quality 4330V MOD Round Bars. This widespread trust underscores our reputation for reliability and excellence. By consistently meeting and exceeding the expectations of our international clientele, we continue to solidify our position as a leader in the global steel market.
Countries We Export To
UNITED STATES, EUROPE, UK, UAE, SAUDI ARABIA, OMAN, KUWAIT, JORDAN, QATAR, INDONESIA, MALAYSIA, BRAZIL, SPAIN, ITALY, FRANCE, GERMANY, BAHRAIN, SRI LANKA, AZERBAIJAN, AUSTRALIA, AUSTRIA, PHILIPPINES, TURKEY, RUSSIA, IRAN, IRAQ, CANADA, KOREA, JAPAN, YEMEN, FINLAND, ZIMBABWE, HUNGARY, PORTUGAL, VIETNAM, MOROCCO, THAILAND, SOUTH AFRICA, MEXICO, SINGAPORE, GREECE, KUWAIT, POLAND, NEW ZEALAND, SWEDEN, SWITZERLAND, BELGIUM, BHUTAN, BANGLADESH, TAIWAN, ROMANIA, CAMBODIA, KAZAKHSTAN, AFGHANISTAN.
