Inox Steel India is a reliable manufacturer, supplier, and exporter of Alloy Steel Round Bars in high-strength grades AISI 4140, AISI 4340, EN19, and EN24, manufactured and supplied as per ASTM A29 / A322 and EN 10083-3 standards.
Our alloy steel round bars are widely used in heavy engineering, automotive, power transmission, oil & gas, forging, and machinery manufacturing, where high tensile strength, toughness, and fatigue resistance are critical.
With ready stock in hot rolled, forged, and bright drawn conditions, Inox Steel India supports both OEM production requirements and large-scale project supplies, delivering material with full traceability and consistent metallurgical quality.
Alloy steel round bars are solid cylindrical bars produced by adding alloying elements such as chromium, molybdenum, and nickel to carbon steel. These elements significantly enhance strength, hardness, wear resistance, and impact performance, making alloy steel round bars suitable for demanding mechanical applications.
At Inox Steel India, alloy steel round bars are manufactured using controlled processes to achieve uniform microstructure and reliable mechanical properties.
This controlled manufacturing ensures alloy steel round bars suitable for high-load, high-stress, and cyclic service conditions.
These advantages make alloy steel round bars a preferred choice for critical mechanical and structural components.
Inox Steel India supplies alloy steel round bars in the following grades:
Applicable Standards:
ASTM A29 / ASTM A322 / EN 10083-3
MASTER TECHNICAL DATA SHEET:
Alloy Steel Round Bars
| Parameter | AISI 4140 | AISI 4340 | EN19 | EN24 |
|---|---|---|---|---|
| Product Form | Solid Round Bar | Solid Round Bar | Solid Round Bar | Solid Round Bar |
| Material Category | Chromium-Molybdenum Alloy Steel | Nickel-Chromium-Molybdenum Alloy Steel | Alloy Steel | Alloy Steel |
| Standard | ASTM A29 / A322 | ASTM A29 / A322 | EN 10083-3 | EN 10083-3 |
| Equivalent Grades | EN19 | EN24 | AISI 4140 | AISI 4340 |
| Manufacturing Process | Hot Rolled / Forged / Bright Drawn | Hot Rolled / Forged / Bright Drawn | Hot Rolled / Bright Drawn | Hot Rolled / Forged / Bright Drawn |
| Diameter Range (mm) | 6 – 500 mm | 6 – 450 mm | 6 – 500 mm | 6 – 450 mm |
| Standard Sizes (mm) | 8, 10, 12, 16, 20, 25, 32, 40, 50, 65, 80, 100 | Same as 4140 | Same as 4140 | Same as 4140 |
| Length | Random / Fixed / Cut-to-Length | Random / Fixed / Cut-to-Length | Random / Fixed / Cut-to-Length | Random / Fixed / Cut-to-Length |
| Surface Finish | Black / Bright / Peeled | Black / Bright / Peeled | Black / Bright | Black / Bright / Peeled |
| Density (g/cm³) | 7.85 | 7.85 | 7.85 | 7.85 |
| Tensile Strength (MPa) | 850 – 1000 | 930 – 1080 | 850 – 1000 | 900 – 1100 |
| Yield Strength (MPa) | ≥ 680 | ≥ 720 | ≥ 680 | ≥ 750 |
| Elongation (%) | ≥ 13 | ≥ 12 | ≥ 13 | ≥ 12 |
| Hardness (HB) | 248 – 302 | 269 – 331 | 248 – 302 | 269 – 331 |
| Heat Treatment | Quenched & Tempered | Quenched & Tempered | Quenched & Tempered | Quenched & Tempered |
| Machinability | Very Good | Good | Very Good | Good |
| Weldability | Moderate | Fair | Moderate | Fair |
| Impact Strength | High | Very High | High | Very High |
| Typical Applications | Shafts, Gears, Bolts | Aircraft Parts, Heavy Shafts | Automotive & Machinery Parts | High-Load Engineering Parts |
| Testing | Chemical, Mechanical, UT | Chemical, Mechanical, UT | Chemical, Mechanical, UT | Chemical, Mechanical, UT |
| Certification | EN 10204 3.1 / 3.2 | EN 10204 3.1 / 3.2 | EN 10204 3.1 / 3.2 | EN 10204 3.1 / 3.2 |
| HSN Code | 7228 | 7228 | 7228 | 7228 |
| Export Suitability | Domestic & Export | Export | Export | Export |
When choosing alloy steel round bars, the following factors are critical:
Global & Indian Demand Overview
India:
Strong demand from automotive manufacturers, gearbox producers, forging units, and heavy engineering industries in Mumbai, Pune, Chennai, Coimbatore, Ludhiana, and Faridabad.
GCC & Middle East:
Used in oil & gas equipment, drilling components, and industrial machinery.
Europe & Americas:
Widely used for power transmission systems, aerospace-linked engineering parts, and heavy-duty shafts.
Inox Steel India supports these markets with ready inventory, export documentation, and consistent supply schedules.
Applications of Alloy Steel Round Bars
Alloy steel round bars supplied by Inox Steel India are engineered for applications where high strength, fatigue resistance, toughness, and wear resistance are essential. These bars are widely used in load-bearing and dynamically stressed components across multiple industries.
Application-Wise Usage
| Industry / Sector | Typical Applications | Preferred Grades |
| Automotive | Crankshafts, axles, gears, connecting rods | EN19 / 4140 |
| Heavy Engineering | Power transmission shafts, rollers | EN24 / 4340 |
| Forging Industry | Forged blanks, forged components | EN19, EN24 |
| Oil & Gas | Drill collars, couplings, tool joints | EN24 / 4340 |
| Machinery Manufacturing | Spindles, pinions, bushings | EN19 |
| Power & Energy | Turbine components, high-load shafts | EN24 |
These applications require consistent metallurgical properties, which are achieved through controlled heat treatment and inspection.
Alloy Steel Round Bar Size Range & Standard Dimensions
Inox Steel India supplies alloy steel round bars in a comprehensive size range suitable for machining, forging, and structural applications.
Standard Diameter Range (mm)
6 mm, 8 mm, 10 mm, 12 mm, 16 mm, 20 mm, 25 mm, 32 mm, 40 mm, 50 mm, 65 mm, 80 mm, 100 mm and above up to 500 mm
Length Options
Finish Options
Bright and peeled bars are preferred for precision machining and critical dimensional requirements.
Alloy Steel Round Bar Weight Calculation
The standard formula used for estimating alloy steel round bar weight:
Weight (kg/m) = (D² × 0.006165)
Where D = Diameter in mm
This calculation assists in material planning, transport estimation, and cost analysis.
Alloy Steel Round Bar Price – Indicative Range
Alloy steel prices vary based on alloy content, heat treatment condition, and diameter. Below is an indicative alloy steel round bar price range in India.
| Grade | Approx. Price INR/kg | Typical Use |
| EN19 / 4140 | ₹ 120 – ₹ 180 | Shafts, gears, machined parts |
| EN24 / 4340 | ₹ 160 – ₹ 240 | Heavy-load & shock-resistant parts |
Prices are indicative and subject to change based on alloy surcharge, billet rates, and size.
HSN / HS Code for Alloy Steel Round Bars
Applicable for alloy steel bars and rods under Indian and international trade classification.
Testing & Quality Assurance
All alloy steel round bars supplied by Inox Steel India undergo stringent inspection and testing to ensure reliability in high-stress applications.
Quality Tests Conducted
Documentation Supplied
These quality controls ensure consistent performance and long service life in demanding environments.
| Industry | Application |
| Automotive | Crankshafts, axles, gears, transmission shafts |
| Heavy Engineering | Power transmission shafts, rollers |
| Oil & Gas | Tool joints, couplings, drilling components |
| Forging Industry | Forged blanks and precision forgings |
| Machinery Manufacturing | Spindles, pinions, high-load components |
| Power & Energy | Turbine shafts and heavy mechanical parts |
Alloy steel round bar prices typically range from ₹120 – ₹240 per kg, depending on grade, size, and heat treatment. Yes, alloy steel round bars are commonly supplied in quenched & tempered (Q&T) condition. EN24 / AISI 4340 is preferred for high-load and shock-resistant shaft applications. The HSN code for alloy steel round bars is 7228. Yes, we supply custom cut lengths as per drawings or machining requirements. What is the price of alloy steel round bars per kg in India?
Are alloy steel round bars supplied in heat-treated condition?
Which alloy steel grade is best for high-load shafts?
What is the HSN code for alloy steel round bars?
Do you provide custom cut-to-length alloy steel bars?