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Grades: EN19, EN24, AISI 4140 | High-Strength Engineering Square Bars
Inox Steel India is a trusted manufacturer, supplier, stockist, and exporter of alloy steel square bars in India, supplying premium-quality EN19, EN24, and AISI 4140 square bars to heavy engineering, automotive, power transmission, forging, and OEM manufacturing sectors. These alloy steel square bars are designed for applications where high strength, toughness, fatigue resistance, and wear performance are critical.
Compared to carbon steel square bars, alloy steel square bars offer superior mechanical strength, deeper hardenability, and better performance under dynamic and shock loads. This makes them the preferred material for shafts, gears, axles, crank components, high-load machine parts, and precision-engineered assemblies.
All alloy steel square bars supplied by Inox Steel India are produced in accordance with EN 10083, ASTM A29, and AISI standards, ensuring consistent metallurgy, reliable performance, and compatibility with international engineering specifications.
An alloy steel square bar is a solid steel bar with a square cross-section, manufactured by alloying carbon steel with elements such as chromium, molybdenum, and nickel to enhance strength, hardness, wear resistance, and fatigue life.
Alloy steel square bars are used in applications where:
The square geometry provides excellent torsional strength and flat reference surfaces, making these bars suitable for machining and precision fitting in mechanical systems.
Inox Steel India follows controlled manufacturing and processing methods to ensure alloy steel square bars meet demanding engineering requirements.
Manufacturing Process Overview:
This process ensures uniform mechanical properties, excellent machinability, and long-term reliability in high-stress service conditions.
Alloy steel square bars offer significant advantages over carbon and mild steel bars:
These advantages make alloy steel square bars ideal for critical mechanical and structural applications.
Inox Steel India supplies alloy steel square bars in multiple grades, each selected for specific engineering needs:
🔹 EN19 Alloy Steel Square Bars
Chromium–molybdenum alloy steel offering high strength, good toughness, and reliable machinability. Commonly used for shafts, gears, and axles.
🔹 EN24 Alloy Steel Square Bars
Nickel–chromium–molybdenum alloy steel providing excellent impact strength and fatigue resistance, suitable for heavy-duty components and power transmission parts.
🔹 AISI 4140 Alloy Steel Square Bars
Widely used international grade with balanced strength and wear resistance, suitable for machine parts, tooling, and high-stress applications.
MASTER TECHNICAL DATASHEET – ALLOY STEEL SQUARE BARS
| Parameter | EN19 | EN24 | AISI 4140 |
|---|---|---|---|
| Material Category | Chromium–Molybdenum Alloy Steel | Nickel–Chromium–Molybdenum Alloy Steel | Chromium–Molybdenum Alloy Steel |
| EN / AISI Equivalent | EN19 (708M40) | EN24 (817M40) | AISI 4140 |
| ASTM Equivalent | ASTM A29 4140 | ASTM A29 4340 | ASTM A29 4140 |
| Carbon Content (%) | 0.35 – 0.45 | 0.36 – 0.44 | 0.38 – 0.43 |
| Density | 7.85 g/cm³ | 7.85 g/cm³ | 7.85 g/cm³ |
| Tensile Strength | 850 – 1000 MPa | 850 – 1000 MPa | 850 – 1000 MPa |
| Yield Strength | ≥ 680 MPa | ≥ 680 MPa | ≥ 655 MPa |
| Elongation | ≥ 13 % | ≥ 13 % | ≥ 12 % |
| Hardness (HB) | 248 – 302 | 248 – 302 | 250 – 300 |
| Impact Strength | Good | Excellent | Good |
| Machinability | Good | Fair | Good |
| Weldability | Fair (Preheat Required) | Fair (Preheat Required) | Fair (Preheat Required) |
| Heat Treatment | Q&T / Annealed | Q&T / Annealed | Q&T / Annealed |
| Surface Finish | Black / Bright | Black / Bright | Black / Bright |
| Manufacturing Process | Hot Rolled / Forged | Hot Rolled / Forged | Hot Rolled / Forged |
| Size Range (Square) | 8 mm – 150 mm | 10 mm – 150 mm | 8 mm – 150 mm |
| Length | Random / Fixed / Cut Length | Random / Fixed / Cut Length | Random / Fixed / Cut Length |
| Dimensional Tolerance | EN / ASTM Std | EN / ASTM Std | ASTM Std |
| Testing | Chemical, Mechanical, Impact | Chemical, Mechanical, Impact | Chemical, Mechanical |
| Certification | EN 10204 3.1 | EN 10204 3.1 | EN 10204 3.1 |
| HSN / HS Code | 7228.30.29 | 7228.30.29 | 7228.30.29 |
| Typical Applications | Shafts, Gears, Axles | Heavy-duty components | High-stress machine parts |
Before selecting alloy steel square bars, engineers and buyers should evaluate:
Correct grade selection ensures maximum component life, reduced failure risk, and optimized performance.
This section gives engineering-grade clarity for buyers, EPC contractors, OEMs, and machine shops looking to source alloy steel square bars with confidence—covering sizes, weight calculations, indicative pricing, testing, and real-world usage.
Inox Steel India supplies alloy steel square bars in standard industry sizes as well as custom cut lengths suitable for machining, forging, and heavy-duty components.
Standard Square Bar Sizes (mm)
8 | 10 | 12 | 16 | 20 | 22 | 25 | 30 | 32 | 35 | 40 | 45 | 50 | 60 | 65 | 70 | 75 | 80 | 100 | 120 | 150
Length: Random (3–6 m) or fixed / cut lengths
Tolerance: As per EN / ASTM standards
Finish: Hot Rolled (Black), Bright Drawn (Cold Drawn)
Frequently demanded sizes include 12mm, 20mm, 25mm, 40mm, and 50mm alloy steel square bars for shafts and machine parts.
The following steel square bar weight chart helps in cost estimation and BOQ preparation.
(Density considered: 7.85 g/cm³)
| Square Size (mm) | Weight (kg/m) |
|---|---|
| 8 × 8 | 0.50 |
| 10 × 10 | 0.79 |
| 12 × 12 | 1.13 |
| 16 × 16 | 2.01 |
| 20 × 20 | 3.14 |
| 25 × 25 | 4.91 |
| 30 × 30 | 7.07 |
| 40 × 40 | 12.56 |
| 50 × 50 | 19.63 |
| 65 × 65 | 33.15 |
| 75 × 75 | 44.16 |
| 100 × 100 | 78.50 |
This chart addresses common buyer queries such as:
steel square bar weight
square bar weight per meter
ms / alloy steel square bar weight calculation
Prices vary based on grade, size, heat treatment condition, and quantity. Below is an indicative alloy steel square bar price range for reference.
Indicative Price Range (INR/kg – India)
| Grade | Approx. Price / Kg (INR) | Typical Use |
|---|---|---|
| EN19 | ₹ 110 – ₹ 150 | Shafts, gears, axles |
| EN24 | ₹ 145 – ₹ 190 | Heavy-duty machine parts |
| AISI 4140 | ₹ 120 – ₹ 165 | High-stress engineering components |
Buyer-intent examples:
Alloy steel square bars price list
EN19 square bar price
EN24 square bar price per kg
Prices are indicative and depend on Q&T condition, bright finish, and order volume.
HSN Code (India): 7228.30.29
HS Code (Export): 7228.30
Applicable to alloy steel bars and rods, hot rolled or forged, for domestic billing and export documentation.
All alloy steel square bars supplied by Inox Steel India are tested to meet high mechanical performance standards.
Standard Tests Conducted:
Certification:
Alloy steel square bars are used where carbon steel is not sufficient and higher strength is required.
Buyers prefer Inox Steel India for technical assurance, consistent supply, and transparent commercial practices.
Key Advantages:
Our focus is to ensure right grade selection, right heat treatment, and on-time delivery—every time.
| Industry | Application | Preferred Grade |
|---|---|---|
| Heavy Engineering | Shafts, gears, spindles | EN19 / 4140 |
| Automotive & OEM | Axles, drive components | EN24 |
| Power Transmission | Couplings, pinions | EN19 / EN24 |
| Forging Units | Forging stock | EN19 / EN24 |
| Machinery Manufacturing | High-stress machine parts | 4140 |
| Mining & Construction Equipment | Wear & impact components | EN24 |
All alloy steel square bars are packed to prevent damage and preserve surface integrity during transit.
Packing Standards:
Export Destinations: UAE, Saudi Arabia, Oman, Qatar, Africa, Southeast Asia, Europe
Domestic Dispatch: Mumbai, Navi Mumbai, Pune, Ahmedabad, Chennai, Bengaluru
Whether you need EN19 for shafts, EN24 for heavy-duty components, or AISI 4140 for high-stress machinery, Inox Steel India offers certified quality, competitive pricing, and reliable delivery.
52-A, Mulji Thackersi Bldg, Islampura Street, Shop No. 10, Near Alankar Cinema, Mumbai – 400 004
alloy@inoxsteelindia.in
+91 9930796690
EN24 is preferred for heavy-duty and impact-resistant components; EN19/4140 are widely used for shafts and gears. Yes, we supply quenched and tempered alloy steel square bars as per application requirements. Standard sizes range from 8 mm to 150 mm, with custom sizes and cut lengths available. The HSN code is 7228.30.29 for alloy steel bars and rods. Yes, all supplies are accompanied by EN 10204 3.1 Mill Test Certificates Yes, we regularly export to GCC, Africa, Europe, and Southeast Asia. Which grade is best for heavy-duty applications?
Do you supply Q&T condition bars?
What sizes are available?
What is the HSN code for alloy steel square bars?
Do you provide test certificates?
Do you export alloy steel square bars?
Inox Steel India supplies alloy steel square bars in EN19, EN24 & 4140 grades. Get latest price per kg, sizes, weight chart & certified stock in India.