Home > Square Bars > Carbon Steel Square Bars
What Is Carbon Steel Square Bar?
A carbon steel square bar is a solid steel product with a square cross-section, manufactured from low to medium carbon steel grades. These bars are designed to provide good strength, machinability, and weldability for general engineering and structural use.
Square bars are widely preferred over round bars in applications where:
Because of their geometry, square bars distribute load evenly and offer higher resistance to twisting, making them ideal for columns, supports, machine frames, and base structures.
Inox Steel India is a trusted manufacturer, supplier, stockist, and exporter of carbon steel square bars in India, supplying C20, C45, and EN8 square bars to engineering, fabrication, construction, and heavy industrial sectors.
Our carbon steel square bars are widely used across OEM manufacturing, machining workshops, forging units, infrastructure projects, and structural fabrication, where strength, reliability, and cost efficiency are essential.
Carbon steel square bars are one of the most commonly used solid steel products due to their balanced mechanical properties, ease of fabrication, and economical pricing compared to alloy and stainless steel alternatives.
Their uniform square cross-section makes them suitable for load-bearing components, columns, frames, machine parts, and fabricated assemblies.
All carbon steel square bars supplied by Inox Steel India are manufactured in compliance with ASTM A29, IS standards, and EN 10083, ensuring consistent quality, predictable performance, and compatibility with industrial drawings and specifications.
A carbon steel square bar is a solid steel product with a square cross-section, manufactured from low to medium carbon steel grades.
These bars are designed to provide good strength, machinability, and weldability for general engineering and structural use.
Square bars are widely preferred over round bars in applications where:
Because of their geometry, square bars distribute load evenly and offer higher resistance to twisting, making them ideal for columns, supports, machine frames, and base structures.
Inox Steel India follows controlled manufacturing processes to ensure carbon steel square bars meet dimensional and mechanical requirements for industrial use.
This process results in uniform strength, good surface finish, and reliable machinability, making carbon steel square bars suitable for both fabrication and precision engineering.
C20 Carbon Steel Square Bars: Low carbon steel grade offering excellent weldability and formability. Commonly used in general fabrication, frames, and light structural work.
C45 Carbon Steel Square Bars: Medium carbon steel grade with higher strength and hardness, suitable for shafts, gears, bolts, and machine components.
EN8 Carbon Steel Square Bars: Widely used engineering steel offering good tensile strength and wear resistance, ideal for automotive and mechanical parts.
(Detailed mechanical and chemical properties are provided in the Master Technical Datasheet above.)
Selecting the correct grade ensures better performance, reduced material failure, and long service life.
Standard Square Bar Sizes (mm):
6 | 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 IS / ASTM / EN standards
Finish: Hot Rolled (Black), Bright Drawn (Cold Drawn)
| Square Size (mm) | Weight (kg/m) |
| 6 × 6 | 0.28 |
| 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 |
| Grade | Approx. Price / Kg (INR) | Typical Use |
| C20 | ₹ 58 – ₹ 72 | Fabrication, frames, light structures |
| C45 | ₹ 68 – ₹ 90 | Shafts, bolts, machine parts |
| EN8 | ₹ 72 – ₹ 95 | Engineering & automotive components |
Prices are indicative and vary with mill source, finish (bright vs black), and order volume.
HSN Code (India): 7214.99.90
HS Code (Export): 7214.99
Mill Test Certificate: EN 10204 3.1
Heat Number Traceability
Third-Party Inspection: SGS / TUV / BV (on request)
| Industry | Application | Preferred Grade |
| Construction & Infrastructure | Columns, frames, base structures | C20 |
| Fabrication Units | Welded frames, fixtures | C20 |
| Engineering & OEM | Shafts, pins, couplings | C45 / EN8 |
| Automotive & Machinery | Gears, axles, components | EN8 |
| Forging Units | Forging stock | C45 |
| General Engineering | Structural & machined parts | C20 / C45 |
Whether you require C20 square bars for construction, C45 for machinery, or EN8 for engineering components, Inox Steel India offers reliable supply with certified quality.
C45 and EN8 are preferred for machining due to higher strength and wear resistance. Prices generally range from ₹58 – ₹95 per kg, depending on grade, size, and finish. Standard sizes range from 6 mm to 150 mm, with custom sizes available on request. Yes, C20 square bars are commonly used in structural columns and supports. Yes, we supply bright drawn carbon steel square bars for machining applications. Yes, all supplies are accompanied by EN 10204 3.1 Mill Test Certificates. Which carbon steel grade is best for machining?
What is the price of carbon steel square bars in India?
What sizes are available in carbon steel square bars?
Are carbon steel square bars suitable for columns?
Do you supply bright square bars?
Do you provide test certificates?