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Underground Bunker Rectangular Square Steel Pipes Black Steel Tubes

Name: Underground Bunker Rectangular Square Steel Pipes Black Steel Tubes
Brand: TIANJIN FRIEND STEEL TUBE CO., LTD.
SKU: 1906734532

Tianjin, ChinaTIANJIN FRIEND STEEL TUBE CO., LTD.

US$750.00-880.00

20 Tons

Sample price:US$0.00/piece.Request sample

Product profile

Customization

Available

Type

Welded

Technique

ERW

Model NO.

20*20-500*500MM/20*40-300*500MM

Material

Carbon Steel

Surface Treatment

Black

Usage

Pipeline Transport, Boiler Pipe, Hydraulic/Automobile Pipe, Oil/Gas Drilling, Machinery Industry, Chemical Industry, Mining, Special Purpose

Section Shape

Square

Standard

ASTM, GB, JIS, DIN, BS, ASTM A106-2006

Grade

Q195-Q345, A53-A369, St35-St52, 10#-45#, Q235, Q34

Thickness

1mm-20mm

Length

5.8m/6m/12m/ Customized

Tolerance

+/-5%

Processing Service

Bending, Welding, Punching, Cutting

Secondary or Not

Pipe Ends

Plain, Bevel, Threaded or Grooved

Alloy or Not

Non-Alloy

Product Name

Square and Rectangular Pipe, Tube

Zinc Coating

220 G/M2 ( or Customized)

End Protector

None or Plastic Caps

Payment Term

LC/Tt

Company Advantage

Great Quality and Quick Delivery

Certification

ISO 9001 CE

Transport Package

Packed by Steel Strips

Specification

20*20-500*500MM/20*40-300*500MM

Trademark

TFCO

Origin

Tianjin China

HS Code

73063090

Production Capacity

70000ton/Year

Key features

Wide Size Range: Square pipes 20x20mm to 500x500mm, Rectangular pipes 20x40mm to 300x500mm.

Customizable Length: Lengths available from 2.0m to 12m with custom options for specific needs.

Multiple Steel Grades: Available in Q195, Q235, Q355, A53, A36, and other international standards.

Comprehensive Certifications: Certified with ISO 9001, CE, ISO 18001, and ISO 14001 for quality assurance.

Versatile Processing Services: Offers bending, welding, punching, and cutting services to meet project needs.

Diverse Surface Treatment: Anti-rusty coating with slight oil and PVC wrapping for protection.

Flexible Pipe Ends: Options include plain, bevel, threaded, or grooved ends for various connections.

Global Shipping Capability: Exports to Southeast Asia, Europe, Middle East, and other global markets.

Company profile

Importers and ExportersHigh Repeat Buyers Choice

TIANJIN FRIEND STEEL TUBE CO., LTD.

Tianjin, China

CertifiedBusiness Type: Manufacturer/Factory & Trading Company CertifiedR&D Capacity: OEM Service Available CertifiedCustomization Options: Customization from Samples CertifiedExport Year: 1 Year CertifiedNearest Port: Tianjin portAverage Response Time: ≤1.34h

AI-Powered supplier vetting

SummaryTIANJIN FRIEND STEEL TUBE CO., LTD. is a China-based limited company established in 2009 and located in Tianjin. It offers steel pipe and scaffolding products, reports five production lines, annual scaffolding-tube productivity of 5,000 tons, and stated order lead times of within 15 working days in both peak and off-peak seasons. The supplier states that it can handle special customer requirements and customized processing using imported materials, and that it maintains a dedicated after-sales team. ISO 9001:2015 and ISO 14001:2015 certificates are reported. Export sales are stated at 71%–90%, with exporting beginning in 2021. However, several capabilities remain unverified, including contract manufacturing status, inventory services, overseas facilities or agents, ODM/OEM, SDK-related R&D, and customer case details. Audit information identifies TÜV Rheinland, but the evaluation result is recorded as 0 without an explained grading scale.

Supplier typeThe supplier is identified as TIANJIN FRIEND STEEL TUBE CO., LTD., a China-based limited company in Tianjin established in 2009. The records also describe it as a combined entity and, in one slice, as a trading company, while its product description identifies steel-pipe and scaffolding manufacturing activities.

CertificationsThe supplier reports ISO 9001:2015 and ISO 14001:2015 certifications. A TÜV Rheinland audit is also recorded with a report period from March 19, 2025 to March 18, 2026, although the audit result is listed as 0 without interpretation.

After-Sales capabilityThe supplier explicitly states that it has a devoted and enthusiastic after-sales service team. It also claims to provide systems for delivery, invoicing, settlement, transportation, and goods storage, supporting a broader service process.

Production capacityThe supplier reports five production lines and annual scaffolding-tube productivity of 5,000 tons, with stated order fulfillment within 15 working days during both peak and off-peak seasons. Its product description covers high-frequency welded pipes, galvanized steel pipes, and scaffolding products, providing explicit evidence of operating production capability.

Customization capabilityThe supplier explicitly states that special customer requirements can be handled and that imported materials can be used for customized processing. However, formal manufacturing-contract status and ODM/OEM service availability are marked unknown, so the evidence supports customization claims but not the broader service categories.