Product Details

GB/T6728 Polygon Shaped Special Hollow Section Tube

1. STANDARD:

GB/T3094-2000, GB/T6728-2002, ASTM A500, JIS G 3466, DIN EN 10210, GB/T178-2005

2. MATERIAL:

Q195, Q215, Q235, Q275, Q345, 20#, 45#, Stainless steel, Seamless steel, Alloy steel.

3. SURFACE:

Bared, Galvanized, Oiled, Color Paint, 3PE; Or Other Anti-corrosive Treatment.

4. TECHINQUE:

Hot rolled, Cold rolled, ERW, High-frequency welded.

5. APPLICATION:

(1).Machinery manufacture: glass machinery, agricultural machinery, textile machinery, papermaking machinery, food machinery, electrical equipment, sanitation equipment.

(2).Roads and Bridges: railway, aviation, expressway, overpass, road fence, traffic signs.

(3).Construction engineering: steel structure construction, sports venue, three-dimensional garage, exhibition hall.

(4).Decoration: wrought iron doors and windows, outdoor advertising, pavilion and vestibule, glass curtain wall.

(5).Transportation: automobile manufacture, ship manufacture, container, tricycle, tower crane.

Assessment Criteria	First Grade			Second Grade
Wall thickness/t	4mm≤t≤10mm ±8%t	4mm≤t≤10mm ±8%t
	10mm≤t≤22mm ±6%t	10mm≤t≤22mm ±6%t
	Suitable for flat parts	Suitable for flat parts
Right Angle	90°±1.0°	90°±1.5°
Corner radius of circular arc	t≤6mm(1.5-2.5)t
	6mm≤t≤10mm(2-3)t
	T>10mm(2.5-3.5)t
Concave and convex degree	≤5% side length		≤6% side length
Bending degree	≤1.5mm/m, total bending degree≤0.15% specified length		≤2mm/m, total bending degree≤0.2% specified length
Distortion degree	2mm+0.5mm/m		-
Scale accuracy	Ordinary precision 0- +50mm		Ordinary precision 0- +70mm
	Fine scale 0- +5mm		Fine scale 0- +15mm
Cutting quality	100mm≤side length≤300mm		100mm≤side length≤300mm
	Cutting slope≤3mm		Cutting slope≤4mm
	300mm<side length≤500mm		300mm<side length≤550mm
	Cutting slope≤3mm		Cutting slope≤6mm
	End without cutting burr		End with few cutting burr