ERW Pre-Galvanized Steel Pipe Manufacturer

ERW Pre-Galvanized Steel Pipe

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Welded steel pipe with a slightly thinner coating of zinc

ERW pre-galvanized steel pipes, also known as mill galvanized pipes, are recognized for their bright, smooth, and aesthetically pleasing appearance. These pipes are coated with a thinner layer of zinc compared to traditional galvanized steel, making them a cost-effective solution for various applications. Despite the lighter zinc coating, they still offer adequate protection against corrosion.

Pre-galvanized steel pipes are tailored to support projects where both budget and visual appeal are important.

Standard

ASTM A500
IS065
BS1387. BS1139
GBT 3091/3094 & GB/T13793

Applications

Greenhouse Pipe
Conduit Pipe
Furniture Pipe
Structural Tubing

Size

Outside Diameter:
Round tube: 12mm to 100mm
Square tube: 10×10mm to 75×75mm
Rectangular tube: 20×40mm to 50×100mm
Wall Thickness: 0.8mm to 2.2mm
Zinc Coating: 30g/m²-100g/m²
Length:
Regular length: 5.8m or 6m or 12m
Custom cut-to-length: 2m to 12m

Pipe End

Plain End
Beveled End
Grooved End
Threaded End

Specifications

BS 1387-85 XL

BS 1387-85L

BS 1387-85 M

ASTM A53 GRADE A SCH40


DN	Designation of Thread	Outside Diameter		Wall Thickness
DN	Designation of Thread	(mm)	(inch)	(mm)	(inch)
15	1/2	21.40-21.00	0.843-0.827	1.80	0.071
20	3/4'	26.90-26.40	1.059-1.039	2.00	0.079
25	1'	33.80-33.20	1.331-1.307	2.00	0.079
32	1-1/4'	4250-41.90	1673-1.650	2.00	0.079
40	1-1/2'	48.40-47.80	1.906-1.882	2.3	0.091
50	2'	60.20-59.60	2.370-2.346	2.30	0.091
65	2-1/2'	76.00-7520	2.992-2.961	2.60	0.102
80	3'	88.70-87.90	3.492-3.461	2.60	0.102
100	4'	113.90-113.00	4.484-4.449	3.20	0.126


DN	Designation of Thread	Outside Diameter		Wall Thickness
DN	Designation of Thread	(mm)	(inch)	(mm)	(inch)
15	1/2'	21.40-21.00	0.843-0.827	2.00	0.079
20	3/4'	26.90-26.40	1.059-1.039	2.30	0.091
25	1'	33.80-33.20	1.331-1.307	2.60	0.102
32	1-1/4'	4250-41.90	1.673-1.65	2.60	0.102
40	1-1/2'	48.40-47.80	1.906-1.882	2.90	0.11
50	2'	60.20-59.60	2.370-2.346	2.90	0.114
65	2-1/2'	76.00-75.20	2.992-2.961	3.2	0.126
80	3'	88.70-87.90	3.492-3.461	3.20	0.126
100	4'	113.90=113.00	4.484-4.449	3.60	0.142


DN	Designation of Thread	Outside Diameter		Wall Thickness
DN	Designation of Thread	(mm)	(inch)	(mm)		(inch)
15	1/2'	21.70-21.10	0.854-0.831	2.6	0.102
20	3/4'	27.20-26.60	1.071-1.047	2.6	0.102
25	1'	34.20-33.40	1.346-1.315	3.2	0.126
32	1-1/4'	42.90-42.10	1.689-1.657	3.2	0.126
40	1-1/2'	48.80-48.00	1.921-1.890	3.2	0.126
50	2'	60.80-59.80	2.394-2.354	3.6	0.142
65	2-1/2'	76.60-75.40	3.016-2.969	3.6	0.142
80	3'	89.50-88.10	3.524-3.469	4	0.157
100	4'	114.90-113.30	4.524-4.461	4.5	0.177
150	6'	166.10-164.10	6.539-6.461	5	0.197


NPS	Outside Diameter		Wall Thickness
NPS	(mm)	(inch)	(mm)	(inch)
1/2'	21.30	0.840	2.77	0.109
3/4'	26.70	1.050	2.87	0.113
1'	33.40	1.315	3.38	0.133
1-1/4'	42.20	1.660	3.56	0.140
1-1/2'	48.30	1.900	3.68	0.145
2'	60.30	2.375	3.91	0.154
2-1/2'	73.00	2.875	5.16	0.203
3'	88.90	3.500	5.49	0.216
4'	114.30	4.500	6.02	0.237
6'	168.30	6.625	7.11	0.280
8'	219.10	8.625	8.18	0.322

ERW Steel Pipe Production Process

Leveling
Ends Cutting
Slitting
Recoiling
Coil Ramp
Uncoiling
Leveling
Ends Cutting
Trimming & Welding
Coil Accumulator
Strip Ultrasonic Testing (UT)
Forming
High Frequency Welding
Welding
Deburring
Seam Annealing
Air/Water Cooling
Sizing (Round Tube)
Online Ultrasonic Testing (U.S. Test)
Sizing (Square & Rectangular Tube)
Straightening
Flying Cut-off
Flattening Test
End Finishing
Hydrostatic Test
Appearance Inspection
Offline Ultrasonic Testing (U.S. Test)
Marking
Oil Coating
Packaging & Storage