What payment terms are accepted?

We accept LC, T/T, D/P, PayPal, Western Union, and small-amount payments. Terms are negotiable based on the order value and customer relationship.

What are the common applications for these square steel tubes?

They are widely used in building construction (frames, beams), fencing, agricultural greenhouses, solar mounting structures, industrial machinery, and automotive OEM parts.

Hot Dipped Galvanized Square Steel Pipe Q355b Structural Hollow Section ERW

Name: Hot Dipped Galvanized Square Steel Pipe Q355b Structural Hollow Section ERW
Brand: Shandong Kanghong Manufacturing Co., Limited
SKU: 2155589312

Shandong, ChinaShandong Kanghong Manufacturing Co., Limited

US$500.00-706.00

5 Tons

Product profile

Customization

Available

Type

Welded

Technique

ERW

Model NO.

Q235B Q355B ASTM A500

Material

Carbon Steel

Surface Treatment

Hot DIP Galvanized

Usage

Pipeline Transport, Boiler Pipe, Hydraulic/Automobile Pipe, Food/Beverage/Dairy Products, Machinery Industry, Construction & Decoration, Special Purpose

Section Shape

Square

Standard

ASTM, GB, JIS, En

Grade

Q235B, Q355b, ASTM A500

Outer Dimension

20X20mm - 400X400mm

Wall Thickness

1.0mm - 12.0mm

Length

6m, 12m, as Customer's Request

Zinc Coating Weight

≥80G/M²

Zinc Coating Thickness

≥45μm

Yield Strength

≥235MPa

Tensile Strength

Tensile Strength 370-500MPa

Elongation

≥26%

Processing Service

Cutting, Drilling, Bending

Size Tolerance

±0.5mm

MOQ

5 Tons

Delivery Time

7-15 Days

Certification

ISO9001, SGS, BV

Transport Package

Packed in Bundles

Trademark

KANGHONG

Origin

Shandong, China

Production Capacity

500000 Ton

Key features

Wide Size Customization: Outer dimensions from 15x15mm to 600x600mm with custom cut-to-length and wall thickness options.

Multi-Standard Compliance: Meets ASTM A500, EN 10219, JIS G3466, AS/NZS 1163, and GB/T 6728 international standards.

Versatile Processing Services: Offers cutting, drilling, bending, punching, and welding to meet specific fabrication needs.

Certified Quality Assurance: ISO 9001 certified manufacturing with SGS, BV, and Intertek third-party inspection support.

Dual Galvanizing Options: Choose between Hot-Dip (HDG) for durability or Pre-Galvanized for cost-effective indoor use.

Broad Application Scope: Ideal for construction, solar mounting, fencing, agriculture, and industrial machinery frameworks.

Company profile

Importers and ExportersFast DeliveryQuality AssuranceProduction Process Visualization

Shandong Kanghong Manufacturing Co., Limited

Shandong, China

CertifiedBusiness Type: Manufacturer/Factory & Trading Company CertifiedR&D Capacity: ODM Service Available & OEM Service Available CertifiedCustomization Options: Customization from Samples, Customization from Designs, etc. CertifiedExport Year: Foreign trade business has just begun CertifiedNearest Port: TianjinAverage Response Time: ≤7.74h

AI-Powered supplier vetting

SummaryThe supplier is explicitly identified as a professional technical supplier specializing in stainless steel, carbon steel, galvanized steel, metal processing, and related products. It provides 3D software design and multiple forms of customization, including sample-based, design-based, full, minor, and flexible customization. Production is supported by factories with complete facilities, while stated quality controls include batch testing, quality assurance, and raw-material traceability. However, finished products are also described as being checked by packing staff, and no written corrective-action or complaint-handling procedures are available. The supplier states that it has exported to more than 50 countries, but another slice says foreign trade has just begun, creating inconsistency in export-history evidence. No certification information or sufficient evidence of financial credibility is provided. SDK availability is explicitly absent.

Supplier typeThe supplier is explicitly described as a professional technical supplier and as a manufacturer and seller of stainless steel, carbon steel, galvanized steel, metal products, mechanical parts, and related materials. Its registered business scope also includes metal cutting processing and import/export activities, supporting classification as a technical metal-product supplier.

After-Sales capabilityThe supplier states that it provides after-sales support and timely after-sales service through its international sales team, and presents customer-oriented service as a business principle. However, it also reports no written procedures or records for handling customer complaints or corrective and preventive actions, so the formal robustness of after-sales management is not demonstrated.

R&D capabilityThe supplier is identified as having professional technical R&D capability and offers 3D software design services with multiple customization modes. However, it explicitly has no available SDK, so the evidence supports product and design development capability but not software-development integration capability.

Production capacityThe supplier states that its production factories are located in other cities with complete supporting facilities and that it specializes in producing steel coils, sheets, pipes, mechanical parts, and related products. Quality assurance, batch testing, and raw-material traceability are also stated, although one slice says finished products are checked by packing staff, indicating that the detailed final-inspection structure is not fully clear.

Customization capabilityThe supplier explicitly offers customization from samples, customization from customer designs, full customization, minor customization, and flexible customization. Its sales team also states that it supports order customization, providing direct evidence of broad customization capability.

Product Q&A

Q:What are the available outer dimensions and wall thicknesses?

Outer dimensions range from 15x15mm to 600x600mm. Wall thickness varies from 0.6mm to 30mm, with custom sizes available upon request.

Q:What certifications do your products comply with?

Our products comply with ASTM A500, EN 10219, JIS G3466, AS/NZS 1163, and GB/T 6728. We are ISO 9001 certified and provide Mill Test Certificates (MTC) and third-party inspection reports from SGS or BV.

Q:What is the minimum order quantity (MOQ)?

The minimum order quantity is 5 tons for standard products. For specific custom requirements, please contact our sales team for details.

Q:Can you provide custom sizes and processing services?

Yes, we offer full customization including custom outer dimensions, wall thicknesses, and lengths. We also provide processing services such as cutting, drilling, bending, punching, and welding.

Q:What is the typical delivery time?

The standard delivery time is 7-15 days. During peak seasons, lead time may extend to one month, while off-season delivery is within 15 workdays.