China MS black iron square steel tube Q235 / building Manufacturers, Factory

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China MS black iron square steel tube Q235 / building Manufacturers, Factory

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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	Through a bundle According to customer’s requirement
Loading port	Tianjin/Xingang

Product Photos

Frequently Asked Questions (FAQ)

Q1: What are the main applications of the hollow section square tube?

A1: These square tubes are widely used in structural engineering, construction frameworks, machinery manufacturing, standard fencing, and various industrial applications where strength and reliability are required.

Q2: What steel materials and grades do you support?

A2: We offer a wide range of steel materials including Q195 to Q345, 10#, 45#, S235JR, GR.B-D, STK500, and BS1387, meeting various international mechanical and chemical requirements.

Q3: Can the length and thickness of the square tubes be customized?

A3: Yes. The wall thickness ranges from 0.7mm to 13mm, and the length can be customized from 1 meter to 14 meters according to specific customer requirements.

Q4: What certifications do these hollow section tubes carry?

A4: Our products are fully certified and compliant with ISO, BV, CE, and SGS certifications, ensuring compliance with global quality and engineering standards.

Q5: What are your standard delivery times and payment terms?

A5: The delivery time is typically 25 days after receiving the deposit. Our standard payment term is 30% T/T deposit in advance, with the remaining 70% balance settled upon the B/L copy.

Q6: How are the square tubes packaged for secure delivery?

A6: To prevent damage during transit, the square tubes are securely packed in bundles, or customized according to the buyer's detailed packaging request.