Product Introduction
ERW (Electric Resistance Welding) carbon steel pipe refers to straight-seam high-frequency resistance welding carbon steel pipe. It heats the edges of carbon steel plates or strips to a molten state through resistance heat generated by high-frequency current, and achieves seamless bonding and forming under the action of squeeze rolls.
Without filler metal in the production process, it boasts core advantages such as high production efficiency, excellent dimensional accuracy, good toughness and strong cost competitiveness, relying on advanced roll forming and high-frequency welding technology.
| Grade | Q195, Q215, Q345, S235JR, GRB-D, STK500 etc. | |||
| Standard | GB, BS, DIN, EN, JIS, ASTM, A53, SCH40/80STD,etc | |||
| Technique | ERW | |||
| Surface Treatment | black/galvanized, can be customized | |||
| Outer Diameter | 21-2000mm, can be customized | |||
| Length | 6m, 12m or as required | |||
| Thickness | 1-80mm, can be customized | |||
| Tolerance | ±1% | |||
| Processing Service | Welding, Punching, Cutting, Bending, Decoiling | |||
| Application | Greenhouse construction, Architecture, Bridge, boiler, shipbuilding, power plant, pipeine, mechanical processing | |||
Material and Chemical Composition
The contents of carbon, sulfur and phosphorus in Q195, Q215 and Q345 materials are strictly controlled to ensure their weldability and mechanical properties. Their core chemical compositions (mass fraction) are shown in the following table:
|
Element |
Q195 |
Q215 |
Q345 |
|
C (Carbon) |
≤0.12% |
≤0.15% |
≤0.20% |
|
Si (Silicon) |
≤0.35% |
≤0.35% |
≤0.55% |
|
Mn (Manganese) |
0.30%-0.65% |
0.35%-0.65% |
1.00%-1.60% |
|
P (Phosphorus) |
≤0.045% |
≤0.045% |
≤0.040% |
|
S (Sulfur) |
≤0.050% |
≤0.050% |
≤0.040% |
The low-impurity design ensures good corrosion resistance, impact resistance and weldability of the pipes, which are suitable for different industrial working conditions.
Mechanical Properties
The mechanical properties of ERW carbon steel pipes of Q195, Q215 and Q345 grades, all strictly tested by professional equipment, are shown in the following table:
|
Performance Indicator |
Q195 |
Q215 |
Q345 |
|
Yield Strength (≥) |
195MPa |
215MPa |
345MPa |
|
Tensile Strength (≥) |
315MPa |
335MPa |
470MPa |
|
Impact Toughness (-20℃, ≥) |
27J |
27J |
34J |
|
Vickers Hardness (HV, ≤) |
200 |
210 |
230 |
The above indicators are all strictly tested by professional equipment to ensure the mechanical properties of the product meet standards and adapt to various working conditions.
Surface Treatment Methods
Basic Treatment
Automatic removal of internal and external burrs, with internal burr height ≤0.15mm to ensure smooth fluid transportation.
Anti-Corrosion Treatment
Customizable hot-dip galvanizing, coal tar epoxy coating, 3PE anti-corrosion layer to improve corrosion resistance and service life.
Precision Control
After sizing treatment, roundness error ≤0.5%D and ovality ≤0.3%, with excellent dimensional accuracy.
Value-added Serivices for carbon steel pipe
We provide a full range of customized value-added processing services for ERW carbon steel pipes, to better meet your project specifications and on-site installation demands.
Our professional secondary processing includes:
High-precision laser cutting
Threading & coupling
Standard saw cutting with fixed length
Bending services and more
Precision hole punching & notching
Cutting, sorting & packaging
Pipe bending & forming
Chamfering & beveling
Surface treatment (painting, anti-rust oil, galvanizing)
The applications
ERW carbon steel pipes are suitable for multiple working conditions and widely used in the following fields:
Oil and Gas Storage and Transportation
As the core pipe material for long-distance and gathering and transportation pipelines of oil and gas, it is suitable for transporting crude oil, natural gas and other media.
Urban Infrastructure
Used in urban water supply, gas and heating pipe networks, it complies with the new national standard for gas transportation and ensures the safety and stability of civil transportation.
Industrial Engineering
Applicable to chemical medium transportation, power plant supporting facilities and agricultural irrigation, it can also be used as transmission shaft pipes and hydraulic cylinder pipes in mechanical manufacturing.
Construction and Structure
Used as building piling pipes, bridge support pipes and steel structure components, high-strength products can improve the structural strength and construction efficiency of buildings.
FAQs
Q: What's the difference between ERW and seamless carbon steel pipe?
A: ERW pipe is welded from steel strip, while seamless pipe is extruded without a weld seam.
Q: What standards are your ERW carbon steel pipes produced under?
A: Our ERW pipes comply with ASTM A53, API 5L, GB/T 3091 and other international standards.
Q: What surface treatments are available for ERW carbon steel pipe?
A: We offer black painting, anti-rust oil, galvanizing and varnish for corrosion protection.
Q: Can you provide customized processing services?
A: Yes, we support laser cutting, saw cutting, punching, bending, threading and chamfering.
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