What is the surface treatment of the square tube?

The surface is treated with anti-rust oil, giving it a black appearance to prevent corrosion.

What steel grades are available?

We offer Q355, 16Mn, St52, and S355jrh. Q355B is highlighted for its superior anti-impact performance.

What is the after-sales service policy?

We provide after-sales service support for our products.

High-Strength Q355b Steel Square Tube for Construction Projects

Name: High-Strength Q355b Steel Square Tube for Construction Projects
Brand: Qingdao Wanrunda Imp and Exp Co., Ltd.
SKU: 1965895092

Shandong, ChinaQingdao Wanrunda Imp and Exp Co., Ltd.

US$950.00

20 Tons

Product profile

Customization

Available

After-sales Service

Provide

Warranty

1year

Type

Welded

Technique

ERW

Material

Alloy Steel

Surface Treatment

Black

Usage

Construction & Decoration

Section Shape

Square

Size

150X150mm

Thickness

5mm

Length

6meters

Steel Grade

Q355/16mn/St52/S355jrh

Yield Strength

345MPa - 355MPa

Transport Package

Bulk Packing, Anti-Rust Oil Covered

Specification

150x150x5mm x 6meters

Trademark

Wanrunda

Origin

Shandong

HS Code

7306610000

Production Capacity

2000mt Per Year

Key features

High-Strength Q355B Steel: Superior anti-impact performance compared to Q235, SS400, and A53 grades for cold climates.

Customizable Specifications: Accepts fixed lengths and custom sizes including 150x150mm, 5mm thickness, and various steel grades.

Versatile Applications: Ideal for steel structures, houses, machines, road signs, and hydraulic pipes in construction.

Strict Quality Tolerance: Thickness and OD tolerance controlled within +/- 0.25mm for precision engineering.

Anti-Rust Surface Treatment: Surface covered with anti-rust oil, appearing black, ensuring durability against corrosion.

Fast Delivery Time: Delivery within 15-20 days after receiving deposit, with off-season lead time under 15 workdays.

Flexible Payment Terms: Supports T/T or L/C at sight, along with Western Union and small-amount payments.

Global Export Experience: Exported to Russia, Australia, India, and more, meeting ASTM, JIS, and DIN standards.

Company profile

Qingdao Wanrunda Imp and Exp Co., Ltd.

Shandong, China

Business Type: Manufacturer/Factory, Trading CompanyExport Year: 2008-09-18Nearest Port: Qingdao Port, Tianjin port, Shanghai PortAverage Response Time: ≤15hTerms of Payment: LC, T/T, Western Union, etc.International Commercial Terms(Incoterms): FOB, CFR, CIF

AI-Powered supplier vetting

SummaryQingdao Wanrunda Imp and Exp Co., Ltd. is identified as both a trading company and manufacturer/factory based in Shandong, China. It reports five production lines and listed annual capacities totaling 1,600 tons across steel products, including steel fences, trellises, plates, coils, pipes, and sections. The supplier states that 90% of sales are exports, has held exporting activity since 2008, and possesses self-operated import and export rights. ISO 9000 and ISO 9001 management-system certifications are reported. Its capabilities include punching, bending, welding, galvanizing, electrostatic spraying, powder coating, painting, and oiling, with manufacturing to ASTM, JIS, DIN, and API standards. Evidence is insufficient to assess after-sales service execution, financial credibility, innovation strength, and customer cases.

Supplier typeThe supplier is explicitly classified as both a trading company and manufacturer/factory. It is a China-based limited company in Shandong and reports self-operated import and export rights, with exporting activity beginning in 2008.

CertificationsThe supplier reports holding ISO 9000 and ISO 9001 supplier management-system certifications. These stated certifications provide explicit evidence of formal quality-management credentials.

Production capacityThe supplier reports five production lines and stated annual capacities of 200 tons for steel fence and guardrail, 300 tons for angle-steel and grape trellis, 100 tons for self-nail steel plates and hanger straps, and 500 tons each for steel angles/flat/coil/plate/stainless steel and steel pipe/hollow section/alloy steel. These figures explicitly demonstrate multi-product manufacturing capacity.

Customization capabilityThe supplier states that it has its own processing equipment and can perform punching, bending, welding, galvanizing, electrostatic spraying, powder coating, painting, and oiling. It also states that products can be manufactured according to ASTM, JIS, DIN, and API standards, supporting customized processing and specification compliance.