black iron square tube connector 30mm Q235B

Place of Origin:Tianjin, China

Material:Q195,Q215,Q235B，Q345，Q39,16Mn,20# ，45#，20MN2,SS400,ST52-3.

Grade:Q195,Q215,Q235B，Q345，Q39,16Mn,20# ，45#，20MN2,SS400,ST52-3.

Surface:Black,Pre-galvanized，Hot dip galvanized，Electro galvanized,Painted,Threaded,Socket,Engraved.

Zinc Coating:30-275g/m2

Usage:Construction ,Structure,Building construction,machine manufacturing,Electrical,Chemical industry

Application:Fluid Pipe

Section Shape:Square/Rectangular

Outer Diameter:10*10mm-1000*1000mm/10*20mm-500*1000mm

Thickness:0.6-30 mm

Standard:GB/T6728-2002,ASTM A500 GR.A.B.C,JIS S3466

Send email to us Whatsapp Email

Product Detail

Product description:

Product name	hollow section square tube
Wall Thickness	0.7mm–13mm
Length	1–14mAccording 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	25days after receive ur deposits
Package	Through a bundle According to customer’s requirement
Loading port	Tianjin/Xingang

Previous: square steel tube price Q195 pipe / building

Next: galvanized steel pipe for greenhouse frame Q235B

1.we are factory .( our price will have an advantage over trading companies.)

2.Don’t worry about the delivery date . we are sure to deliver the goods in time and quality to achieve customer satisfaction .

Different from other factories：

1.we applied for received 3 patents .(Groove pipe ,Shoulder pipe,Victaulic pipe )

2. Port : our factory just 40 kilometers from Xingang port ,is biggest port in the north of China .

3.Our manufacturing equipment include 4 pre-galvanized products lines,8 ERW steel pipe product lines,3 hot-dipped galvanized process lines.

Surface treatment


powder coating square tube	galvanized steel square tube	black steel square tube

Factory certificate

customers photos


The Australia buys a lot of steel pipes in our factory.The customer came to our factory to inspect the goods.	Our boss met our Filipino client at the exhibition.