What is your sample policy?

We can supply the sample if we have ready parts in stock, but the customers have to pay the sample cost and the courier cost.

Do you test all your goods before delivery?

Yes, we have 100% test before delivery

How do you make our business long-term and good relationship?

1. We keep good quality and competitive price to ensure our customers benefit . 2. We respect every customer as our friend and we sincerely do business and make friends with them, no matter where they come from

Heavy-Gauge Black Square Tube Rectangular Hollow 30X40mm Rectangular Carbon Steel Tubular Pipe

Name: Heavy-Gauge Black Square Tube Rectangular Hollow 30X40mm Rectangular Carbon Steel Tubular Pipe
Brand: Shanghai Changzeng Metal Co., Ltd.
SKU: 2250576635

Shanghai, ChinaShanghai Changzeng Metal Co., Ltd.

US$468.00

3-19 Tons

US$436.00

20-49 Tons

US$412.00

50+ Tons

Sample price:US$15.00/piece.Request sample

Product profile

Customization

Available

Type

Welded

Technique

Hot Rolled

Material

Carbon Steel

Surface Treatment

Black

Usage

Pipeline Transport, Boiler Pipe, Hydraulic/Automobile Pipe, Oil/Gas Drilling, Food/Beverage/Dairy Products, Machinery Industry, Chemical Industry, Mining, Construction & Decoration, Special Purpose

Section Shape

Square

MOQ

3 Tons

Sample

Available

Length

6m or 5.8m as Requirement

Thickness

1-50mm

Delivery Time

7days

Certification

Port Name

Shanghai/Tianjin

Grade

Q235B Q355b A550 A36

Coating Type

Oiled or Not Oiled

Payment

30% Tt Deposit,70% Balance Before Delivery

Transport Package

in Bundles & Containers

Specification

13*13*1.0mm-400*400*20mm

Trademark

Origin

Shanghai

HS Code

7306610000

Production Capacity

5000 Tons/ Month,

Key features

Wide Range of Sizes: Available from 20x20mm to 500x500mm with thickness 1.0mm to 217mm.

Customizable Dimensions: Length can be cut to 6m, 5.8m, or as per customer requirements.

Multiple Material Grades: Offers Q235B, Q355b, A550, A36, SS400, St37, St52, and more.

Fast Delivery: Delivery within 3 days for standard sizes due to large stock availability.

Low Minimum Order Quantity: Accepts orders as low as 1 ton, 3 tons, 5 tons, 10 tons, or 20 tons.

Comprehensive Processing Services: Includes hot-dip galvanizing, color painting, coating, cutting, bending, and punching.

Strict Quality Control: 100% inspection before delivery with third-party inspection options available.

Global Shipping Options: Supports sea, air, and truck delivery with flexible container loading.

Company profile

Years of Export ExperienceHigh Repeat Buyers ChoiceIn-stock CapacityQuality Assurance

Shanghai Changzeng Metal Co., Ltd.

Shanghai, China

Business Type: Manufacturer/Factory, Trading Company CertifiedCustomization Options: Customization from Samples, Customization from Designs, etc.Export Year: 2016-01-13Nearest Port: Shanghai Port, Tianjin Port, Qingdao PortAverage Response Time: ≤4.05hTerms of Payment: LC, T/T, PayPal, etc.

AI-Powered supplier vetting

SummaryThe supplier is a Shanghai-based trading company that also identifies as a manufacturer/factory, with 19 years of export experience and 90% of sales from exports. It offers broad customization from samples, designs, and full-custom requirements, and reports standardized finished-product inspection instructions and quality assurance. However, the available information shows no new products in the past year, no ODM, SDK, overseas agents, overseas warehouse, showroom, or offline trade-show participation. Corrective/preventive action and complaint-handling procedures are undocumented, while supplier-service assessment procedures and approved supplier records are absent. Financial operating figures provided are zero, but their interpretation is not independently verifiable from the slices. Customer cases and certifications are not provided.

Supplier typeThe supplier is described as a trading company in Shanghai and is also identified as a Trading Company, Manufacturer/Factory. This indicates a mixed trading and manufacturing business classification, but the slices do not establish the scale or scope of its own production facilities.

After-Sales capabilityThe supplier reports in-stock service capacity and lead times within 15 working days in both peak and off-seasons. However, it has no overseas warehouse, overseas showroom, overseas agents or branches, and no written procedures or records for complaint handling or corrective and preventive actions, limiting evidence of a structured after-sales system.

Financial creditThe provided financial fields report zero operating revenue, profit, margins, current ratios, and cash outflows for the stated periods, while the supplier is listed as a limited company with registered capital information. These reported operating indicators provide explicit evidence of weak financial performance, although the slices do not explain the data quality or accounting context.

R&D capabilityThe supplier reports no new products in the past year, no ODM service, and no available SDK. These statements directly indicate limited demonstrated recent product-development and technical innovation capability.

Production capacityThe supplier is classified as both a trading company and manufacturer/factory, has in-stock capacity, and reports standardized instructions for finished-product inspection and quality assurance. Nevertheless, outsourcing procedures and manufacturing-capacity contract status are unknown, and only one quality assurance/quality control inspector is reported, so production depth cannot be fully confirmed.

Customization capabilityThe supplier explicitly offers customization from samples, customization from designs, full customization, minor customization, and flexible customization in both design-service and R&D-related descriptions. This is direct evidence of broad customization coverage, although it does not quantify engineering resources or production limits.