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Longitudinal Welded Steel Pipe supplied by Tianjin YuJie Steel Pipe Trading Co., Ltd." style="width: 100%; height: auto; border-radius: 8px; box-shadow: 0 4px 14px rgba(0,0,0,0.1);">
When you stand on a construction site, look at a refinery expansion, or plan a water transmission line across rugged terrain, the one thing you cannot compromise on is the integrity of the pipe under your feet. Tianjin YuJie Steel Pipe Trading Co., Ltd. understands this pressure. That is why our longitudinal welded steel pipe has become a trusted workhorse for contractors, engineers, and procurement managers in more than 40 countries.
This pipe is not just a hollow cylinder. It is the result of high-frequency induction welding, precision edge trimming, and layer-by-layer quality checks that turn flat steel strip into a round, straight, and perfectly uniform product. The longitudinal weld seam runs parallel to the axis of the pipe, which gives it excellent straightness and a consistent wall thickness. For projects that require a tight seal, easy alignment, and predictable flow rates, this design is often the most practical and cost-effective choice.
Our team at Tianjin YuJie Steel Pipe Trading Co., Ltd. has spent years refining our supply chain so that every single pipe we ship arrives on time, with full traceability, and ready to perform. In the sections below, we will walk you through the manufacturing steps, the measurable advantages, the technical data, and the real-world scenarios where this product saves both time and money.
The longitudinal welded steel pipe produced and distributed by Tianjin YuJie Steel Pipe Trading Co., Ltd. is primarily used for the transport of liquids, gases, and slurries under low to medium pressure. It also serves as structural tubing in buildings, bridges, scaffolding, and mechanical components. Because the weld seam is straight and the pipe is formed from high-quality hot-rolled or cold-rolled steel strip, it offers a smooth internal surface that helps maintain steady flow and reduces the build-up of deposits.
Common applications include municipal water supply lines, fire protection systems, HVAC piping, agricultural irrigation networks, oil and gas gathering lines, piling supports, and fencing. The pipe can be supplied in black, galvanized, or coated finishes depending on the environment. Hot-dip galvanizing adds a protective zinc layer that fights corrosion, while 3PE and FBE coatings provide long-term resistance in buried or submerged conditions.
One of the strongest reasons to choose this pipe is its consistency. The manufacturing process uses high-frequency resistance welding, where the edges of the strip are heated and forged together under pressure. No filler metal is needed, which results in a narrow, smooth weld seam that is often as strong as the base metal itself. After welding, the pipe passes through inline ultrasonic testing, hydraulic pressure testing, and visual inspection before it is accepted for shipment.
The product range covers outside diameters from small bore tubing of 21.3 mm up to large diameters of 323.9 mm, with wall thicknesses from 1.2 mm to 12.7 mm. Standard lengths are 5.8 m, 6 m, 11.8 m, and 12 m, but custom cutting is available. Steel grades include Q195, Q235, Q345, Grade A, Grade B, S235JR, S275JR, S355JRH, and others, giving engineers the freedom to match the pipe to the load and pressure requirements of their design.
Every batch from Tianjin YuJie Steel Pipe Trading Co., Ltd. comes with mill test certificates that show chemical composition, mechanical properties, and hydrostatic test results. This documentation matters. It turns a simple purchase into a traceable, audit-ready transaction that helps your project pass inspection without delays.
Before welding, the strip edges are milled to remove any irregularity. This extra step ensures a tight butt joint and prevents weld defects. The result is a uniform weld bead that reduces stress concentration and improves the pipe's fatigue life.
The weld is created by heating the strip edges with high-frequency current and pressing them together. This solid-state process produces a narrow heat-affected zone and a joint that matches or exceeds the base material strength. No weld rod or flux is used, keeping the internal surface clean and smooth.
Each weld is scanned by ultrasonic or eddy current equipment immediately after forming. Any pipe that shows the slightest indication is removed from the line. This real-time inspection catches problems before they leave the factory, not after they reach your site.
Every pipe is tested at a pressure that exceeds its intended working pressure by a safe margin. This test verifies the weld and the base metal together. You receive a pipe that has already proven it can hold up under stress.
Outside diameter tolerance, wall thickness tolerance, and straightness are tightly controlled. This makes the pipe easier to fit, weld, and align on site. Less rework means faster installation and lower labor costs.
Black steel, hot-dip galvanized, 3PE, FBE, epoxy paint, or oiled surface. The coating is applied evenly and tested for adhesion and thickness. You can choose the finish that matches your corrosion environment and budget.
The tables below summarize the main dimensions, mechanical properties, and coating choices available from Tianjin YuJie Steel Pipe Trading Co., Ltd. These values are typical for production runs, but we also handle custom specifications with a quick feasibility review.
| Outside Diameter (mm) | Wall Thickness (mm) | Standard Length (m) | Common Steel Grade |
|---|---|---|---|
| 21.3 - 33.7 | 1.2 - 3.2 | 5.8 / 6.0 | Q195, Q235, Grade A |
| 42.4 - 60.3 | 1.5 - 4.0 | 5.8 / 6.0 / 11.8 | Q235, Grade B, S235JR |
| 76.1 - 114.3 | 2.0 - 6.0 | 6.0 / 11.8 / 12.0 | Q235, Q345, S275JR |
| 139.7 - 168.3 | 3.0 - 8.0 | 6.0 / 11.8 / 12.0 | Q235, Q345, S355JRH |
| 219.1 - 273.0 | 4.0 - 10.0 | 11.8 / 12.0 | Q235, Q345, S355JRH |
| 323.9 | 5.0 - 12.7 | 11.8 / 12.0 | Q235, Q345, S355JRH |
| Steel Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) |
|---|---|---|---|
| Q195 | ≥ 195 | 315 - 430 | ≥ 28 |
| Q235 | ≥ 235 | 370 - 500 | ≥ 22 |
| Q345 | ≥ 345 | 470 - 630 | ≥ 20 |
| Grade A | ≥ 205 | 330 - 450 | ≥ 25 |
| Grade B | ≥ 245 | 415 - 550 | ≥ 18 |
| S355JRH | ≥ 355 | 470 - 630 | ≥ 20 |
| Finish | Typical Coating Thickness | Best Used In | Standard Reference |
|---|---|---|---|
| Black / Bare | Light oil film | Indoor or short-term outdoor storage | ASTM A53, API 5L |
| Hot-Dip Galvanized | 80 - 120 µm | Water lines, fences, outdoor structures | ASTM A53, BS 1387 |
| 3PE Coating | 1.8 - 3.7 mm | Buried oil and gas pipelines | DIN 30670, ISO 21809 |
| FBE Coating | 350 - 600 µm | Corrosive soil, water immersion | AWWA C213, CSA Z245.20 |
| Epoxy Paint | 80 - 200 µm | Structural components, visible piping | Customer specification |
Picture a municipal water project in a hot, dry region. The pipes are laid in trenches, backfilled with rocky soil, and expected to last for decades. The longitudinal welded steel pipe from Tianjin YuJie Steel Pipe Trading Co., Ltd. arrives with a robust galvanized or 3PE coating, straight ends that make field joints quick, and uniform wall thickness that resists point loading. The installation crew saves hours because the pipe aligns easily and the weld seams do not require extra grinding.
Now imagine a structural contractor building a large warehouse. Columns and rafters need hollow sections that can carry heavy loads without adding unnecessary weight. The high-frequency welded seam and consistent cross-section of this pipe make it a favorite for architects who want clean lines and predictable performance. It cuts, drills, and welds easily in the shop, reducing fabrication time and improving the final appearance.
For oil and gas gathering systems, the pipe handles low-pressure flow lines and casing. The longitudinal weld is smooth, which helps minimize turbulence and internal erosion. With full traceability from the mill certificate, the operator can confidently install the pipe in remote locations knowing that every batch meets the specified chemical and mechanical requirements.
Other common settings include fire sprinkler systems in commercial buildings, where the pipe is often galvanized and joined with threaded or grooved fittings. Straightness and roundness are critical for fast, leak-free connections. Because our pipe is manufactured to tight tolerances, it works seamlessly with standard fittings and valves.
Agricultural users appreciate the balance of strength and economy. Irrigation pipelines need to cover long distances, resist soil movement, and stay within a tight budget. The longitudinal welded steel pipe offers a lower cost per meter than seamless alternatives while still providing more than enough pressure capacity for most field applications.
There is a quiet satisfaction in knowing that the pipe you ordered will arrive on schedule, meet every dimension you specified, and pass inspection without a single dispute. That feeling is what Tianjin YuJie Steel Pipe Trading Co., Ltd. aims to deliver with every shipment. We know that behind each purchase order there is a project deadline, a safety requirement, and a financial plan that depends on reliable materials.
When the longitudinal welded steel pipe is installed correctly, it fades into the background. It does not leak, it does not deform, and it does not require constant repair. The maintenance team can focus on other tasks instead of chasing pinhole leaks or corroded joints. The plant manager can report to leadership that the new piping system is operating within pressure limits and meeting its design life. The contractor can move to the next phase of construction without worrying about callbacks.
That peace of mind is not accidental. It comes from choosing a supplier that owns its quality control process, invests in modern welding lines, and treats every order as a long-term relationship rather than a one-time transaction. Our customers return because the pipe behaves the way they expect it to, time after time.
We also understand the frustration of receiving pipes with egg-shaped ends, large weld flash inside, or inconsistent lengths. These small defects cause big headaches on site. That is why we inspect both ends of every pipe, remove internal burrs, and bundle the product in a way that protects the bevels and threads during transport. You open the bundle and start working immediately, without sorting through a pile of damaged goods.
Compared to spiral welded pipe, the longitudinal welded steel pipe has a shorter weld length per meter and a simpler forming process. This often results in a rounder cross-section and a thinner weld reinforcement. For small and medium diameters, the straight seam is easier to inspect, easier to coat, and easier to join in the field.
Compared to seamless pipe, the longitudinal welded product offers substantial cost savings while still meeting many pressure requirements. Modern high-frequency welding technology has closed the quality gap dramatically. When you do not need the extreme pressure ratings of seamless pipe, choosing a longitudinal welded alternative is a smart engineering and financial decision.
What truly separates our product, however, is the service behind it. Tianjin YuJie Steel Pipe Trading Co., Ltd. maintains a large, well-organized inventory of common sizes so that urgent orders can be dispatched within days, not weeks. Our sales engineers respond quickly with technical advice, and our documentation team prepares certificates, packing lists, and shipping marks without errors.
We also offer value-added services that simplify your supply chain. Need pipe cut to exact lengths? We do that in-house. Need beveled ends for welding? We can prepare them. Need custom stenciling, color coding, or special packaging? We handle that as well. This reduces the number of vendors you have to manage and keeps your procurement process efficient.
Another key differentiator is our commitment to third-party inspection. If your project requires SGS, BV, TUV, or another agency to witness testing before shipment, we welcome that. Our team coordinates with the inspector, schedules the tests, and makes sure everything is ready. This transparency builds trust and reduces the risk of disputes later.
For stock sizes, the minimum order is usually 5 metric tons. For non-standard diameters or special coatings, the minimum may be 10 to 25 metric tons depending on the rolling schedule and coating line setup. We understand that project phases often start small, so we always try to accommodate mixed-size orders within a single container or truckload.
For items in stock, we can load and ship within 5 to 7 working days after receiving your deposit or letter of credit. For production orders, the lead time is generally 15 to 25 working days for black pipe and an additional 7 to 10 days for galvanizing or special coatings. Ocean transit time depends on the destination port, but we provide a realistic schedule before you commit.
Yes. Our galvanized pipe is manufactured to comply with international potable water standards when requested. The zinc coating is smooth and free of harmful impurities. We can provide a certificate of compliance for drinking water applications, and the pipe interior is flushed and inspected before packing. If your local code requires a specific lining, we can arrange an epoxy lining as an additional service.
Each order includes a mill test certificate showing chemical composition, yield and tensile strength, elongation, and hydrostatic test pressure for every heat number. We also perform 100% eddy current or ultrasonic inspection on the weld seam. If your project requires additional tests such as flattening, flaring, or impact testing, we can arrange them and include the results in the documentation.
Pipes are bundled with steel straps and protected by woven fabric or plastic covers. Each bundle is tagged with size, wall thickness, steel grade, and heat number for easy identification. For sea freight, we use wooden dunnage to prevent movement inside the container. If you need special packing such as end caps for threaded pipes or individual wrapping for coated pipes, we can provide that at a small additional cost.
Absolutely. Standard lengths are 5.8 m, 6 m, 11.8 m, and 12 m, but we can cut to any length within the manufacturing range. Our in-house cutting lines handle both bundle cutting and single-piece precision cutting. Beveling, grooving, and threading are also available. This service reduces scrap at your site and speeds up installation.
We accept T/T bank transfer, L/C at sight, and in some cases D/P or CAD depending on the destination and order history. A typical payment structure is 30% deposit with the balance before shipment or against copy of shipping documents. For repeat customers, we can offer more flexible terms after the first successful transaction.
Yes, we welcome factory visits and third-party inspections. Our production base is located in Tianjin, China, with good access to the port. We can issue an invitation letter for your visa if needed. For third-party inspection, we coordinate with SGS, BV, TUV, or any other accredited agency, and we schedule the testing according to your requirements before loading.
