Black Annealed Cold Rolled Square Tube For Steel Furniture And Structure
Cold Rolled Square Tube Cold Rolled Pipe material is cold rolled carbon steel strap with wall thickness 0.6mm to 2.0mm. When cold-rolled steel strap is heated to the annealing temperature, the surface color will turn black due to high temperature contact with air, which is called black stripping. The physical properties become soft, which is convenient for further welding to make steel pipes. The common hardness is 57HRB, and it can also be reduced to different hardness as needed.
|OD||Sqaure: 15mmx15mm - 80mmx80mm;
Rectagular: 10mm*20mm-350mm*400mm ;
|Thickness||0.6mm - 2 mm (11 gauge-36gauge)|
|Length Range||1m-12m (5.8m , 6m, 19ft, 20ft, 21ft,24ft) available customized|
|Technique||Cold rolled black annealed|
|Surface||Bare, black painting, oiled|
|Raw material||Q195 (carbon steel, yield strength 195mpa)|
|Application||Furniture pipe, steel structure|
Differences between “black annealed cold rolled square tube” and “hot rolled square tube”
|Black annealed cold rolled square tube
Raw material is cold rolled steel straps, then is heated (annealing) .
Wall thickness 0.6mm-2mm
Widely used for steel furniture, chair, desk, table, bed frame, steel structure
|Hot rolled square tube
Raw is hot rolled steel straps, not heated.
Wall thickness 2mm-20mm
Used for construction, steel post.
|OD (mm)||OD (inch)||OD (mm)||OD (inch)|
The cold rolled square tube is widely used for furniture and steel structure frame, such as steel desk, table, chair, steel bed, shelf,gym equipment.
Loading and packing
Package: 1. In bundle, tied with steel straps, no other package.
2.In bundle, wrapped with plastic cover,tied with steel straps, each end with nylon straps.
Loading by container for thin wall thickness tubes.
Sometime put small diameter tube into big diameter tube to save container space.
1. To get an exact price, please send us below details for your inquiry:
(2) OD (out diameter0
(3) Tube legnth
(4) Slightly oiled surface , or dry surface
2. What kind of package will I get?
Generally it will be standard exporting package. We can supply the package according to customers’ requirement.
Find more information from "packing & shipping" item above.
3. What’s the differences between “cold rolled” and “cold rolled black annealed”?
The cold rolled black annealed steel coil will go through heating, while “cold rolled steel coil” will not heat again.
4. About the “oiled” surface .
Oiled surface is to prevent the steel from getting rust. While not all customers want the oiled surface. Generally we supply the product without oiled surface.
5. Customized Requirement.
Product is available customized on thickness, OD, surface coating thickness, logo printing, packing. As each requirement is customized, so please contact our sales to get exact answer.
6.Do you supply sample?
Yes, we provide sample. Generally sample is free of charge.
While international courier isn’t free. We will return the courier cost once we cooperate.
Sample will be sent by air courier when weight less than 1kg.