Square Steel Bar - ASTM Certified Manufacturer |

Hongji Profiles Co., Ltd.

Verified Custom manufacturer · 5 yrs ·

China

Customizable Rock-bottom price

$538 1-49 ton Base price

$514 50-99 ton 4.5% off

$503 ≥100 ton 6.5% off

Price validity: subject to market conditions

Supplier's customization ability

Drawing-based customization
Sample-based customization
Full customization

Quantity

Minimum order quantity: 1 ton

Shipping total: To be negotiated

Subtotal of goods US$ 538.00

Start order request

Payment and delivery

Payment:: by contract — deposit, balance after your inspection
Lead time:: confirmed with the quotation
Packaging:: standard export packing
Samples:: available on request

Product details

Technical Specifications of Square Steel Bar

Property	Parameter	Description
Product Name	Square Steel Bar	Solid square cross-section steel bar for structural and mechanical use
Material Grade	A36 / S235JR / Q235B / 1018 / 1045	A36 (ASTM), S235JR (EN 10025), Q235B (GB/T 700), 1018/1045 (SAE)
Standard Compliance	ASTM A36, EN 10025-2, GB/T 700, JIS G3101	Meets international structural and engineering steel standards
Chemical Composition (C)	0.25% max (A36) / 0.17% max (S235JR)	Carbon content controls hardness and weldability
Chemical Composition (Mn)	0.80–1.20%	Manganese enhances strength and toughness
Chemical Composition (P/S)	P ≤ 0.04%, S ≤ 0.05%	Low phosphorus and sulfur improve ductility and impact resistance
Tensile Strength	400–550 MPa (S235JR) / 400–550 MPa (A36)	Per EN 10025-2 and ASTM A36; higher grades available up to 690 MPa
Yield Strength	≥ 235 MPa (S235JR) / ≥ 250 MPa (A36)	Minimum yield strength ensuring structural load-bearing capacity
Elongation	≥ 20% (A36) / ≥ 26% (S235JR)	Measured on 50 mm gauge length; indicates ductility and formability
Size Range (Side Length)	6 mm – 200 mm	Common sizes: 10×10, 20×20, 25×25, 50×50, 100×100 mm
Length	3 m – 12 m (standard) / custom cut available	Random or fixed lengths per customer requirement
Tolerance	±0.5 mm (side) per EN 10060 / ASTM A36	Dimensional tolerance per applicable rolling standard
Surface Finish	Hot rolled (black scale) / Cold drawn (bright) / Pickled & oiled	Hot rolled for structural use; cold drawn for precision machining applications
Application	Construction, machinery, shafts, frames, brackets, tooling	Widely used in structural fabrication, manufacturing, and general engineering
Certification	Mill Test Certificate (MTC) per EN 10204 3.1 / 2.2	Third-party inspection available (SGS, BV, TÜV upon request)
Packaging	Bundled with steel strapping, 1–3 MT per bundle	Waterproof paper or plastic wrap for export; bare bundle for domestic
MOQ	1 MT (stock items) / 5 MT (custom orders)	Mixed sizes accepted; trial orders welcome

Square Steel Bar - ASTM Certified Manufacturer

Square steel bar is a solid, four-sided steel product manufactured to precise dimensional tolerances, serving critical roles across construction, machinery fabrication, and industrial engineering sectors worldwide. Produced from carbon steel, alloy steel, or stainless steel grades, these bars deliver consistent mechanical performance under demanding load conditions. Our square steel bars are manufactured in compliance with ASTM A36, ASTM A108, and EN 10025 standards, ensuring dimensional accuracy within ±0.5 mm across all size ranges. With a tensile strength reaching 400–550 MPa and yield strength of 250 MPa minimum per ASTM A36, these bars meet the structural integrity requirements of bridges, frames, shafts, and support columns. Available in mill-direct supply with full material traceability and third-party inspection certificates, our products are trusted by procurement engineers and contractors across North America, Europe, and Southeast Asia.

Square steel bar supplier

What is Square Steel Bar?

A square steel bar is a hot-rolled or cold-drawn solid steel section with equal width and height dimensions, typically ranging from 6 mm × 6 mm to 200 mm × 200 mm. It finds extensive application in structural frameworks, tool manufacturing, conveyor systems, and agricultural equipment due to its uniform cross-section, machinability, and superior load-bearing capacity.

Square Steel Bar Technical Specifications

Our square steel bars are available in the following verified parameters:

Parameter	Specification
Material Grade	A36, 1018, 1045, 4140, 304 SS, 316 SS
Size Range	6 mm × 6 mm to 200 mm × 200 mm
Length	3 m – 12 m (custom cutting available)
Tensile Strength	400–550 MPa (ASTM A36 minimum: 400 MPa)
Yield Strength	250 MPa minimum per ASTM A36
Density	7.85 g/cm³ at 20°C
Surface Finish	Hot-rolled (black), cold-drawn, pickled & oiled
Standards	ASTM A36 / A108, EN 10025, GB/T 700
Tolerance	±0.5 mm dimensional tolerance

Get a Competitive Quote for Square Steel Bar

Partner with a trusted ASTM-certified manufacturer for premium grade square steel bar at mill-direct rates. Whether your project demands small custom cuts or large-volume bulk orders, our technical team delivers tailored solutions with full certification documentation and on-time global shipping.

Square steel bar manufacturer

24/7 customer support available
Free samples for quality evaluation
Competitive pricing for bulk orders
Professional technical consultation

Contact us today to get your free quote within 24 hours!

Square steel bar wholesale

Ratings & Reviews

4.5

Based on 8 reviews

5 5

4 2

3 1

2 0

1 0

Charlotte B.

United Kingdom

2025-02-02

Initial size discrepancy flagged — resolved promptly with replacement stock

Our order of 4 tons of 1018 cold-drawn square bar in 35mm × 35mm arrived with approximately 200 kg of pieces measuring 34.3mm on one face — outside the stated ±0.5 mm tolerance. We raised a formal quality claim with photos and measurements. The supplier acknowledged the issue within 24 hours and arranged a replacement shipment for the affected quantity at no additional cost, delivered within 10 days. The remainder of the batch was fully within spec. Credit to the after-sales team for handling it professionally. We are cautiously continuing the relationship and will reassess after the next order.

Liam O.

Australia

2025-02-24

Solid product at a fair price — worth considering for mid-volume orders

We purchased 6 tons of 316 stainless steel square bar in 30mm × 30mm for agricultural equipment components operating in coastal, high-corrosion environments. The material tested well for corrosion resistance and the dimensional tolerance of ±0.4 mm was acceptable for our fabrication tolerances. Shipping to Brisbane took 26 days, which is slightly longer than we hoped, though the supplier was upfront about the timeline. Price per ton was noticeably better than local stainless distributors. We'd rate the overall experience a solid 4 — reliable, but transit time has room for improvement.

Aisha M.

UAE

2025-03-18

Good value on bulk A36 order — minor documentation delay noted

Ordered 15 tons of 80mm × 80mm hot-rolled square bar in ASTM A36 for structural framework on a warehouse project in Dubai. Material quality was strong — tensile strength test results came in at 420 MPa, well within the 400–550 MPa range. Our only issue was a two-day delay in receiving the third-party inspection certificate, which held up our customs clearance briefly. The team resolved it quickly once flagged. Pricing was competitive for this volume and the bars arrived in good condition. Would order again with earlier documentation follow-up.

Know your supplier

Hongji Profiles Co., Ltd.

5 yrs on Sinoali.com

Located in China

Company information More goods

Product Introduction

Hongji Profiles Co., Ltd. is a professional manufacturer and supplier specializing in the R&D, production and sales of high-quality steel profiles. With years of experience in the metallurgical industry, we have earned a solid reputation for reliability, precision and customer-centric service, providing global clients with premium steel profile solutions for diverse industrial and architectural needs.

Our core business covers a full range of steel profiles, including angle steel, channel steel, I-beams, H-beams, C-section steel, Z-section steel, flat steel and custom special steel profiles. These products are widely applied in building structures, bridges, transmission towers, industrial machinery, automotive components and shipping. We strictly control material selection, adopting high-quality steel grades such as S235JR, S355JR, SS400, A36 and Q355 series to ensure excellent mechanical properties, durability and corrosion resistance.

Guided by a customer-first philosophy, we have built a comprehensive sales and after-sales network. Our products are exported to Europe, North America, Southeast Asia and Africa, with long-term cooperation with well-known enterprises. Our team provides one-stop services, and we ensure prompt delivery through sufficient inventory and optimized logistics.

Upholding “Quality First, Integrity-based, Innovation-driven, Win-Win Cooperation”, Hongji is committed to becoming a global leader in the steel profile industry, continuously improving quality and service to create a better future with global customers.

FAQ

Q: Q: What are the common specifications of your square steel?

A:A: Our standard square steel covers a wide range of sizes, with side lengths from 10mm to 200mm and wall thicknesses from 1.5mm to 20mm. Common models include GB Q235B square steel, EN S235JR square steel, ASTM A36 square steel, and JIS SS400 square steel. We provide both solid square steel and hollow square steel (square tube), and detailed dimension tables can be provided upon request.

Q: Q: What materials are your square steel products made of?

Q: Q: Can you customize square steel with non-standard sizes?

Q: Q: What is the difference between hot-rolled square steel and cold-rolled square steel?

Q: Q: Are your square steel products suitable for outdoor and corrosive environments?

Q: Q: What is the standard length of your square steel, and can it be customized?

Customizable Rock-bottom price

$538 1-49 ton Base price

$514 50-99 ton 4.5% off

$503 ≥100 ton 6.5% off

Price validity: subject to market conditions