MS ERW Pipe refers to mild‑steel electric‑resistance‑welded pipe, manufactured from hot‑rolled low‑carbon steel strips. It is the most widely‑used general welded pipe worldwide, compatible with most standard pipe fittings. It can be supplied in black finish for direct application, or serve as substrate for galvanized, painted, and plastic‑coated pipes. Round pipe is the default form; MS ERW square & rectangular hollow sections are also available.
Glory Steel is a professional manufacturer and supplier of MS ERW Pipe. We offer a comprehensive range of sizes and grades, together with value‑added services including cutting, bending and welding.
Specifications
| Item | MS ERW Pipe |
|---|---|
| Material Grade | Q195, Q235B, Q345B, ASTM A53 Gr.B, S235JR |
| Size Range | 1/2″ ~ 24″ |
| Wall Thickness | 1.5 mm-16 mm, SCH10‑SCH40 |
| Length | 1‑12 meters |
| Surface Finish | Black (black pipe), anti‑rust oil, primer, hot‑dip galvanized, pre‑galvanized |
| Value‑added Services | Cutting, threading, beveling, galvanizing, painting |
| MOQ | 10 metric tons |
| Packing | Standard export bundling |
Note
Sizes above NPS 8 are HFW pipe (high‑frequency welding, subtype of ERW), mainly manufactured to API 5L line‑pipe standard, not standard ASTM A53.
Key Features
- Cost‑effective: Formed by cold‑bending hot‑rolled steel strip followed by electric resistance welding. Weld fusion with base metal is sound. Lower cost than seamless pipe, suitable for mass production.
- Good mechanical performance: Various grades are selectable to meet required pressure‑bearing, tensile and yield properties for diverse service conditions.
- Excellent fabrication adaptability: Low‑carbon steel permits welding without pre‑heating. ERW pipes of various profiles can be produced; cutting and bending operations are easy to perform.
- Universal specifications: Compliant with international standards. Automated production lines deliver high dimensional accuracy for sizes from small‑bore to large‑bore.
Material Grade & International Equivalent Reference
| Chinese Grade | International Equivalent | Tensile Strength (MPa) | Yield Strength (MPa) |
|---|---|---|---|
| Q195 | — | 315~430 | ≥195 |
| Q235B | ASTM A53 Gr.B / S235JR / St37‑2 | 375~500 | ≥235 |
| Q345B | ASTM A572 Gr.50 / S355JR / St52‑3 | 470~630 | ≥345 |
| 20# | ASTM 1020 / C20E | ≥410 | ≥245 |
| ASTM A53 Gr.B | — | ≥415 | ≥240 |
Applications
- Fluid transportation: Water supply & drainage, low‑pressure municipal gas, compressed air and general low‑pressure fluid conveyance.
- Building structures: Frames for prefabricated expandable container houses, raw material for scaffolding.
- Mechanical & electrical works: Conduit for cables, chassis for mobile food trucks, components for harvesters, feed processors and mining machinery.
- Municipal projects: Base tube for powder‑coated amusement‑park piping, substrate for green‑fencing, advertising posts and galvanized fence posts.
Manufacturing Process
Hot‑rolled low‑carbon steel coil uncoiling → slitting into steel strips → roll forming → open tube blank → high‑frequency electric‑resistance welding (filler‑wire‑free, straight longitudinal weld) → sizing & straightening → non‑destructive testing → cut‑to‑length → surface protection → bundling & packing.
Our MS ERW Pipe Categories
- Bare Black Pipe: As‑produced surface with black mill scale. Usable directly or for further finishing.
- Coated MS ERW Tube: MS ERW pipe with anti‑corrosion coating
- Galvanized Pipe: Hot‑dip galvanized & pre‑galvanized options available. Grey‑white zinc layer greatly improves carbon‑steel rust resistance.
- Painted Pipe: Coated with anti‑rust primer or topcoat (similar to paint on PPGI coils), mostly for indoor service.
- PE / EP‑Coated MS Pipe: Inner‑and‑outer plastic coating. EP (epoxy) delivers outstanding chemical resistance; PE (polyethylene) provides good impact toughness for buried and corrosive‑environment applications.
- Powder‑coated Pipe: Electrostatic powder coating in full RAL colour range, combining anti‑corrosion and decorative functions for broad‑scope usage.
| Type | Coating Description |
|---|---|
| MS ERW Pipe | No coating |
| Galvanized Pipe | Metallic zinc coating |
| Painted Pipe | Liquid paint finish |
| PE / EP Coated Pipe | Fused plastic lining |
| Powder‑coated Pipe | Electrostatic solid powder coating |
MS ERW pipe weight chart (NPS‑SCH40 System)
| NPS | DN | Outer Diameter (mm) | Wall Thickness (mm) | Theoretical Weight (kg/m) |
|---|---|---|---|---|
| 1/2″ | 15 | 21.3 | 2.77 | 1.27 |
| 3/4″ | 20 | 26.7 | 2.87 | 1.69 |
| 1″ | 25 | 33.4 | 3.38 | 2.50 |
| 1‑1/4″ | 32 | 42.2 | 3.56 | 3.39 |
| 1‑1/2″ | 40 | 48.3 | 3.68 | 4.05 |
| 2″ | 50 | 60.3 | 3.91 | 5.44 |
| 2‑1/2″ | 65 | 73.0 | 5.16 | 8.63 |
| 3″ | 80 | 88.9 | 5.49 | 11.29 |
| 4″ | 100 | 114.3 | 6.02 | 16.07 |
| 5″ | 125 | 141.3 | 6.55 | 21.77 |
| 6″ | 150 | 168.3 | 7.11 | 28.26 |
| 8″ | 200 | 219.1 | 8.18 | 42.55 |
MS ERW Pipe VS MS Seamless Pipe
| Comparison Item | MS ERW Pipe (High‑Frequency Electric‑Resistance‑Welded Pipe) | MS Seamless Pipe |
|---|---|---|
| Manufacturing Process | Roll‑formed from steel strip, with longitudinal weld seam | Billet heated & pierced for rolling, no weld seam |
| Application Scenarios | Medium‑low‑pressure structures, water supply & drainage | High‑temperature & high‑pressure service |
| Cost | Relatively low | High |
| Wall‑thickness Uniformity | Excellent | Good |
FAQ
Q1: Can ERW pipe be used for gas pipelines?
A: Yes. ERW welded pipes are widely applied for low‑pressure gas conveyance. Production shall comply with standards such as GB/T 3091 or ASTM A53, with hydrostatic test and non‑destructive inspection performed.
Q2: Will MS ERW Pipe get rusty?
A: Black‑finish ERW pipe will rust. For rust prevention, select hot‑dip galvanized, painted, or plastic‑coated pipes. Under normal outdoor conditions, galvanized layers can serve 15‑30 years.
Q3: What is your MOQ? Are you factory‑direct? What is typical lead‑time? Do you have export experience?
A: MOQ is 10MT per size. We are a manufacturer based in Tianjin, China. Lead‑time varies by total volume, generally 8‑15 days. We possess rich export experience and maintain long‑term partnerships with customers worldwide.
Why Choose Us
- Full‑range stock of MS ERW pipes, round/square/rectangular profiles, complete grades & sizes.
- Full‑range deep‑processing available: cut‑to‑length, beveling, threading, grooving, punching and hot‑dip galvanizing.
- Container‑adapted export‑grade packing for long‑haul sea transportation.
- Production conforming to American, European, Chinese and Japanese standards, supplying global projects.
Glory Steel Plant, located in Tianjin, China, is an ISO 9001, ISO 14001, and CE-certified factory with an annual output of 100,000 tons. Specialize in manufacturing MS ERW pipe and MS seamless pipe, including all cross-sections, and also offer more corrosion-resistant galvanized pipe and ZAM pipe. With our high-quality products and services, we export to over 120 countries.
