Cold Rolled Black Annealed Square & Rectangular Tube
Core Specifications
Standard OD Sizes (mm & inch)
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Category |
Details |
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Shape & OD |
Square: 15mm×15mm - 80mm×80mmRectangular: 10mm×20mm - 350mm×240mm |
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Wall Thickness |
0.6mm - 2.0mm (11 gauge - 36 gauge) |
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Length |
1m - 12m (5.8m/6m/19ft/20ft/21ft/24ft available; fully customizable) |
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Processing |
Cold rolled black annealed |
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Surface |
Bare, black painting, oiled (customizable) |
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Raw Material |
Q195 carbon steel (yield strength 195MPa) |
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Square Tube (mm×mm) |
Inch Conversion |
Rectangular Tube (mm×mm) |
Inch Conversion |
|
15×15 |
0.59"×0.59" |
15×20 |
0.59"×0.8" |
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16×16 |
0.63"×0.63" |
20×25 |
0.8"×1" |
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18×18 |
0.71"×0.71" |
20×30 |
1.2"×1.6" |
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19×19 |
0.74"×0.74" |
20×40 |
1"×2" |
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20×20 |
0.8"×0.8" |
25×50 |
1.2"×2.4" |
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25×25 |
1"×1" |
30×60 |
1.6"×2.4" |
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30×30 |
1.2"×1.2" |
40×60 |
1.6"×3.2" |
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38×38 |
1.5"×1.5" |
40×80 |
1.6"×3.2" |
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40×40 |
1.6"×1.6" |
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- |
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45×45 |
1.8"×1.8" |
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- |
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50×50 |
2"×2" |
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- |
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55×55 |
2.2"×2.2" |
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- |
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60×60 |
2.4"×2.4" |
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- |
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65×65 |
2.5"×2.5" |
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- |
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70×70 |
2.8"×2.8" |
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- |
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75×75 |
3"×3" |
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- |
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80×80 |
3.2"×3.2" |
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Core Difference: Cold Rolled Black Annealed vs Hot Rolled Tube
|
Aspect |
Cold Rolled Black Annealed Square/Rectangular Tube |
Hot Rolled Square Tube |
|
Raw Material Processing |
Cold rolled steel strap + annealing (heating) |
Hot rolled steel strap (no heating) |
|
OD Range |
Square:15mm-80mm; Rectangular:10mm×20mm+ |
20mm - 400mm |
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Wall Thickness |
0.6mm - 2.0mm |
2mm - 20mm |
|
Main Application |
Steel furniture, small steel structure frames |
Construction, steel posts |
Key Application
Widely applied in furniture manufacturing and steel structure frames, including:
1.Steel furniture: Chairs, desks, tables, bed frames, shelves
2.Gym equipment
3.Various steel structure components
Loading & Packing
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Packaging Options:
Bundled with steel straps (no additional packaging)
Bundled with plastic cover + steel straps, nylon straps fixed at each end
Standard:
Export-standard packaging; fully customizable as per your requirements.
Loading Method
Thin-wall tubes are loaded by container
Space-saving method:
Small-diameter tubes are placed into large-diameter tubes (as needed)
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1. How to get an exact quotation?
Please send the following details for your inquiry:① Wall thickness ② Outer diameter (OD) ③ Tube length ④ Surface type (slightly oiled/dry) ⑤ Order quantity
2. What packaging can I get?
We provide standard export packaging by default, and can customize packaging according to your specific requirements (see Loading & Packing for more).
3. What’s the difference between cold rolled and cold rolled black annealed?
· Cold rolled black annealed steel coil: Undergoes annealing heating process
· Ordinary cold rolled steel coil: No secondary heating after cold rolling
4. What is the purpose of the oiled surface?
Oiled surface is for rust prevention; we supply non-oiled surface products by default (oiled surface available on request).
5. Can I customize the products?
Yes, full customization is supported for:Wall thickness, OD, surface coating thickness, logo printing, packaging.Please contact our sales team for a customized solution and exact quotation.
6. Do you provide free samples?
· Sample: Free of charge for the product itself
· Courier cost: International courier fee is borne by the buyer; the fee will be refunded once we start formal cooperation
· Delivery: Samples (≤1kg) are sent by air courier for fast delivery