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High Quality Square & Rectangular Carbon Steel Pipe from China Suppliers and Factory - 50,000 Tons Available

Product Overview:
Introducing our extensive stock of Square and Rectangular Hollow Sections, boasting 50,000 TONS of high-quality products directly from our factory in China. As leading suppliers in the industry, we ensure that our hollow sections meet international standards and cater to diverse construction and manufacturing needs.

Grade: ASTM A500, S235JR,S355JR, Q235B, Q355B, SS400
Size: 25x25-500x500mm, as per customer's requirement
Surface treatment: black, hot-dipped galvanizing,oiling, painting, etc.
Length: 4-12m,customizable
Packing: standard sea-worthy packaging
Delivery date: in stock, ships immediately
Why Choose Us We are a professional black square/rectangular tube manufacturer with strict quality control, competitive factory prices, and global shipping support. Custom sizes, OEM/ODM, and technical guidance available.We support standard export packaging and flexible delivery, providing reliable customized steel pipe solutions for global clients with factory competitive prices.

Product Details

Specifications

Grade: ASTM A500, EN10025, S235JR, S355JR, A36, Q235, Q355, SS400
Size: 25x25-500x500mm, customizable
Surface Treatment: Black
Length: 4-12m, customizable
Packing: Standard sea-worthy packing
Service: Punching, painting, galvanizing, cutting, welding, etc.

SIZE (MM)	THICKNESS (MM)	SIZE (MM)	THICKNESS (MM)
25x25	1.5-2.5	25x50	1.7-4.0
30x30	1.5-2.8	30x50	1.7-4.0
40x40	1.7-4.0	30x60	1.7-5.0
50x50	1.7-5.0	40x50	1.7-5.0
60x60	1.8-6.0	40x60	1.7-5.0
70x70	1.8-6.0	40x80	1.8-6.0
75x75	1.8-6.0	50x100	1.8-6.0
80x80	1.8-6.0	60x120	2.0-6.0
90x90	2.0-6.0	50x150	2.2-8.0
100x100	2.2-8.0	75x125	2.2-8.0
120x120	4.0-12.0	80x120	2.2-8.0
150x150	2.75-12.0	80x160	4.0-12.0
160x160	4.0-12.0	100x200	2.75-12.0
200x200	4.0-12.0	150x200	4.0-12.0
250x250	4.0-12.0	150x250	4.0-12.0
300x300	5.75-12.0	100x300	4.0-12.0
400x400	6.0-12.0	200x400	4.0-12.0

ASTM A500 Square & Rectangular Pipe - Chemical Composition by Grade
Element	Grade B (%)	Grade C (%)
Carbon (C)	0.26 max	0.26 max
Manganese (Mn)	1.20 max	1.20 max
Phosphorus (P)	0.035 max	0.035 max
Sulfur (S)	0.035 max	0.035 max
Silicon (Si)	0.15–0.40	0.15–0.40
Copper (Cu)	0.20 max (opt.)	0.20 max (opt.)
Nickel (Ni)	0.30 max (opt.)	0.30 max (opt.)
Chromium (Cr)	0.30 max (opt.)	0.30 max (opt.)
ASTM A500 Square & Rectangular Pipe - Mechanical Properties
Property	Grade B	Grade C
Yield Strength(MPa/ksi)	290 MPa/42 ksi	317 MPa/46 ksi
Tensile Strength(MPa/ksi)	414-534 MPa/60-77 ksi	450-565 MPa/65-82 ksi
Elongation(%)	20% min	18% min
Bend Test	Pass 180°	Pass 180°

Product Display

Steel pipe production line

Steel pipe warehouse

Steel pipe oiling

Steel pipe PVC packaging

Loaded into container

Transported to the port

In the port yard

Shipping Process

Free Quality Inspection Report

Exhibition

Exhibition Booth 01

Exhibition Booth 02

Exhibition Booth 03

Exhibition Booth 04

Exhibition Booth 05

Exhibition Booth 06

Company Certificate

ISO14001:2015

ISO9001:2015

Alliance Member OF Tianjin Metal Materials Industry Association

Alliance of China Steel Export

China National Association of Metal Material Trade

FAQ

Are you a manufacturer?

Absolutely. We are a direct manufacturer with our own large-scale facility located in Tianjin, China. You are more than welcome to visit us!

Can I place a trial order for just a few tons?

Certainly. We value every partner regardless of the order size. We can easily arrange an LCL (Less than Container Load) shipment to accommodate your specific needs.