China Black Steel Tube Hollow Section Q195 Manufacturers, Suppliers

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China Black Steel Tube Hollow Section Q195 Manufacturers, Suppliers

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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	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	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 receive ur deposits
Package	1. Through a bundle 2. According to customer's requirement
Loading port	Tianjin/Xingang

Customer's Benefit

What benefits do customers get:

We are factory (our price will have an advantage over trading companies).
Don't worry about the delivery date. We are sure to deliver the goods in time and quality to achieve customer satisfaction.

Product Photos

Different From Other Factories

We applied for and received 3 patents (Groove pipe, Shoulder pipe, Victaulic pipe).
Port: Our factory is just 40 kilometers from Xingang port, which is the biggest port in the north of China.
Our manufacturing equipment includes 4 pre-galvanized products lines, 8 ERW steel pipe product lines, and 3 hot-dipped galvanized process lines.

Customer Case

Australian customer purchase powder coating pre galvanized steel square tube. After customers receives the goods for the first time, customer tests adhesive strength between the powder and the surface of the square tube. Customers test powder and square surface adhesion is small. We have meetings with customers to discuss this problem and we do tests all the time. We polished the surface of the square tube, then send the polished square tube to the heating furnace for heating. We tests all the time and discuss with customer all the time. We keep finding ways. After many tests, the final customer is very satisfied with the products. Now customer purchase a large number of products from factory every month.

Customer Photos

The customer purchased steel pipes in our factory. After the goods were produced, the customer came to our factory for inspection.

Produce Products

Hot-dipped-Galvanized-Steel-Pipe-Square-Tube

Frequently Asked Questions (FAQ)

What are the main advantages of buying directly from your factory?

As a direct factory, we offer substantial pricing advantages over trading companies. Additionally, we ensure prompt and reliable delivery schedules while maintaining top product quality.

What sizes and specifications of square tubes do you supply?

We offer hollow section square tubes with wall thicknesses from 0.7mm to 13mm, outer diameters ranging from 20mm*20mm to 400mm*400mm, and lengths custom-made between 1 and 14 meters.

What materials and standards do your steel tubes conform to?

Our products are manufactured under international standards including ASTM, DIN, JIS, and BS. We work with various grades such as Q195—Q345, 10#, 45#, S235JR, GR.B-D, STK500, and BS1387.

Where is your shipping port and what is the shipping time?

Our factory is located just 40 kilometers from Xingang port (Tianjin), the largest port in Northern China, which facilitates fast shipping. Goods are typically delivered within 25 days of receiving the deposit.

Do you hold any patents or special product designs?

Yes, we hold 3 national patents for our specialized products, including Groove pipes, Shoulder pipes, and Victaulic pipes.

How do you assist customers with technical quality problems?

We collaborate closely with clients to resolve technical issues. For example, when an Australian customer faced a powder adhesion problem, we repeatedly tested and modified our process (polishing and heating the tube surface) until they were completely satisfied, establishing a regular monthly order.