ERW (Electric Resistance Welding) Pipe
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Detailed Description
ERW pipe (Electric Resistance Welding pipe) is a pipe product that realizes continuous welding of metal strips through resistance heat effect.The core technology employs Joule's law (Q=I²Rt), where high-frequency current generates instantaneous high temperatures (1200-1400°C) at metal interfaces through contact resistance under electrode pressure. This induces a thermoplastic state, enabling metallurgical bonding via extrusion rollers.
Parameter |
Details |
Standards |
API 5L, API 5CT, ASTM A53, ASTM A179, ASTM A500, ASTM A252, BS1387, AS1163, JIS3444, EN 10217, EN10219, EN10255,GOST 3262, UL/FM approved |
Steel Grade |
API 5L: PSL1/PSL2 Gr.A, Gr.B, X42, X46, X52, X56, X60, X65, X70, X80 ASTM : GR.A-C, GR.1-3 EN: S235JR, S275J0H, S355JRH, S355J2H AS1163: C250,C350,C450 GOST: St2kp,St3kp |
Outer Diameter (OD) |
21.3mm - 660mm (1/2" - 26") |
Wall Thickness (WT) |
1.5mm - 22.2mm (SCH10, SCH20, SCH30, STD, SCH40, SCH60, XS, SCH80, SCH100, SCH120, SCH140, SCH160, XXS) |
Length |
5.8m, 6m, 11.8m, 12m, or customized (SRL/DRL) |
Pipe Ends |
Plain End (PE), Beveled End (BE), Threaded End (NPT,BSP) with or without couplings |
Surface Treatment |
Black painting, Varnish, Anti-rust oil, Hot-dip galvanized, 3PE, FBE, Epoxy coating, etc. |
Inspection |
Chemical Component Analysis, Mechanical Properties (Tensile, Yield, Elongation), Metallographic Test, Hydrostatic Test, NDT (Eddy Current, Ultrasonic), etc. |
ERW Steel Pipe Specifications
Standard：API 5L, API 5CT, ASTM A53, ASTM A500, ASTM A252, ASTM A795, BS1387, EN10217, EN10219, AS1163, JIS G3444, JIS G3452 | ||||||||||
Steel Grade:Q235B, Q355B, Q420B, Q550B, GR.B, X42, X46, X56, X60, X70, GR.1-3, H40, J55, K55, C250, C350, S235JPH, S355JOH, S235-460 | ||||||||||
DIAMETER |
0.D |
WALL THICKNESS |
||||||||
SCH10S |
STD |
SCH40 |
SCH80 |
|||||||
DN |
INCH |
MM |
MM |
KG/M |
MM |
KG/M |
MM |
KG/M |
MM |
KG/M |
3 |
1/8" |
10.3 |
1.24 |
0.28 |
1.73 |
0.37 |
1.73 |
0.37 |
2.41 |
0.47 |
6 |
1/4" |
13.7 |
1.65 |
0.49 |
2.24 |
0.63 |
2.24 |
0.63 |
3.02 |
0.80 |
9 |
3/8" |
17.1 |
1.65 |
0.63 |
2.31 |
0.84 |
2.31 |
0.84 |
3.20 |
1.10 |
15 |
1/2” |
21.3 |
2.11 |
1.00 |
2.77 |
1.27 |
2.77 |
1.27 |
3.73 |
1.62 |
20 |
3/4” |
26.7 |
2.11 |
1.28 |
2.87 |
1.69 |
2.87 |
1.69 |
3.91 |
2.20 |
25 |
1" |
33.4 |
2.77 |
2.09 |
3.38 |
2.50 |
3.38 |
2.50 |
4.55 |
3.24 |
32 |
1 1/4" |
42.2 |
2.77 |
2.69 |
3.56 |
3.39 |
3.56 |
3.39 |
4.85 |
4.47 |
40 |
1 1/2" |
48.3 |
2.77 |
3.11 |
3.68 |
4.05 |
3.68 |
4.05 |
5.08 |
5.41 |
50 |
2" |
60.3 |
2.77 |
3.93 |
3.91 |
5.44 |
3.91 |
5.44 |
5.54 |
7.48 |
65 |
2 1/2" |
73.0 |
3.05 |
5.26 |
5.16 |
8.63 |
5.16 |
8.63 |
7.01 |
11.41 |
80 |
3 |
88.9 |
3.05 |
6.46 |
5.49 |
11.29 |
5.49 |
11.29 |
7.62 |
15.27 |
90 |
3 1/2" |
101.6 |
3.05 |
7.41 |
5.74 |
13.57 |
5.74 |
13.57 |
8.08 |
18.63 |
100 |
4" |
114.3 |
3.05 |
8.37 |
6.02 |
16.07 |
6.02 |
16.07 |
8.56 |
22.32 |
125 |
5" |
141.3 |
3.40 |
11.56 |
6.55 |
21.77 |
6.55 |
21.77 |
9.53 |
30.97 |
150 |
6" |
168.3 |
3.40 |
13.83 |
7.11 |
28.26 |
7.11 |
28.26 |
10.97 |
42.56 |
200 |
8" |
219.1 |
3.76 |
19.97 |
8.18 |
42.55 |
8.18 |
42.55 |
12.70 |
64.64 |
250 |
10" |
273.0 |
4.19 |
27.77 |
9.27 |
60.29 |
9.27 |
60.29 |
15.09 |
95.97 |
300 |
12" |
323.8 |
4.57 |
35.98 |
9.53 |
73.86 |
10.31 |
79.70 |
17.48 |
132.04 |
350 |
14" |
355.6 |
4.78 |
41.35 |
9.53 |
81.33 |
11.13 |
94.55 |
19.05 |
158.10 |
400 |
16" |
406.4 |
4.78 |
47.34 |
9.53 |
93.27 |
12.70 |
123.30 |
21.44 |
203.53 |
450 |
18" |
457.2 |
4.78 |
53.33 |
9.53 |
105.21 |
14.27 |
155.87 |
23.83 |
254.67 |
500 |
20" |
508.0 |
5.54 |
68.64 |
9.53 |
117.15 |
15.09 |
183.42 |
26.19 |
311.18 |
550 |
22" |
558.8 |
5.54 |
75.58 |
9.53 |
129.08 |
/ |
/ |
28.58 |
373.69 |
600 |
24" |
609.6 |
6.35 |
94.46 |
9.53 |
141.02 |
17.48 |
255.24 |
30.96 |
441.78 |
Data in the table is kg per meter | ||||||||||
Main Application Areas
Due to their excellent comprehensive performance and cost-effectiveness, ERW steel pipes are widely used in various sectors of the national economy:
● Oil and Gas Transportation: Used for low and medium pressure fluid transmission lines, such as natural gas, oil, coal gas, etc.
● Water Conservancy Projects: Used for water supply pipelines, drainage pipelines, irrigation systems.
● Structural Use: Widely used in building structures, bridge supports, scaffolding, mechanical equipment frames, etc.
● Piling Pipes: Used as foundation piling pipes, such as for docks, bridges, and foundations of high-rise buildings.
● Mining: Shoulder pipes are widely used in mining for ventilation systems and drainage due to their cost-effectiveness and reliable welded seams.
● Casing and Tubing: Used in oil drilling for well wall support (casing) and oil extraction (tubing).
● Fire Protection Systems: Used for fire sprinkler system pipelines.
● Heating and Cooling: Used for heating pipes and air conditioning system pipelines.
● Other Industrial Applications: Such as automotive manufacturing, furniture manufacturing, electrical conduits,sign poles, towers & transmission lines etc.
Advantages of ERW Steel Pipe
High Production Efficiency: The ERW process is highly automated with fast production speeds, capable of meeting large-volume order demands.
Cost-Effectiveness: Compared to seamless steel pipes, ERW pipes offer better cost-effectiveness for specific specifications and applications.
High Dimensional Accuracy: ERW pipes have good wall thickness uniformity and small outer diameter tolerances.
Weld Quality: Modern ERW technology, combined with heat treatment processes, can make the weld zone's properties close to those of the parent material.
Smooth Surface: The internal and external surfaces of ERW pipes are relatively smooth, which is beneficial for fluid transport and anti-corrosion coating adhesion.
We are committed to providing high-quality ERW steel pipes, strictly manufactured according to international standards, and can be customized to meet specific customer requirements. Whether for structural support, fluid transport, or other industrial applications, our ERW steel pipes deliver reliable performance.
