China black square steel tube8 100*100 Supplier, Factories

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China black square steel tube8 100*100 Supplier, Factories

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Product Description

Product Name	Hollow section square tube
Wall Thickness	0.7mm–13mm
Length	1–14m According to customer requirements
Outer Diameter	20mm20mm—400mm400
Tolerance	Based on Thickness: ±5～±8%; According to customer’s request
Shape	Square
Material	Q195—Q345, 10#, 45#, S235JR, GR.B-D, STK500, BS1387...
Surface Treatment	Black
Factory Status	Yes
Standard	ASTM, DIN, JIS, BS
Certificate	ISO, BV, CE, SGS
Payment Terms	30% T/T deposit in advance, 70% balance after B/L copy
Delivery Times	25 days after receiving deposits
Package	1. Through a bundle; 2. According to customer’s requirement
Loading Port	Tianjin/Xingang

Customer’s Benefits

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Factory Direct: We are a factory, ensuring our prices have a competitive advantage over trading companies.

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Reliable Delivery: We guarantee timely delivery and high-quality production to ensure full customer satisfaction.

Product Photos

Different From Other Factories

⭐ We have applied for and received 3 patents (Groove pipe, Shoulder pipe, Victaulic pipe).

⭐ Strategic Location: Located near major northern logistics hubs for efficient transport.

⭐ Advanced Equipment: Our facilities include 4 pre-galvanized product lines, 8 ERW steel pipe product lines, and 3 hot-dipped galvanized process lines.

Customer Case Study

Coating Adhesion Solution

A customer purchased powder coating pre-galvanized steel square tubes. Upon testing the adhesive strength between the powder and the square tube surface, initial results were below requirements. We held technical meetings to discuss this and conducted extensive testing. By polishing the surface of the square tube and utilizing a heating furnace process before coating, we successfully optimized the adhesion. After numerous tests, the customer was very satisfied, and now maintains large monthly orders.

Customer Interactions

The customer purchased steel pipes at our factory. After production was completed, the customer visited our facility for a thorough inspection.

Production & Products

Frequently Asked Questions

What materials are used for the hollow section square tubes?

We use a wide range of high-quality materials including Q195—Q345, 10#, 45#, S235JR, GR.B-D, STK500, and BS1387 to meet different industrial needs.

What wall thickness and sizes do you offer?

Our square tubes come in wall thicknesses from 0.7mm to 13mm, with outer diameters ranging from 20mm*20mm up to 400mm*400mm.

Can the length of the tubes be customized?

Yes, we provide lengths between 1m and 14m according to specific customer requirements and project specifications.

What certifications do your products have?

Our products are manufactured according to ASTM, DIN, JIS, and BS standards. We hold ISO, BV, CE, and SGS certifications.

What is the typical lead time for an order?

The standard delivery time is approximately 25 days after the receipt of the deposit.

Do you offer specialized surface treatments?

Our standard treatment is a black surface, but we have extensive experience in polishing and heating processes to ensure high adhesion for additional powder coating if required.