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Welded Pipes
What Are Welded Steel Pipes?
Welded pipes are a type of pipe formed from a flat steel plate or strip that is bent into a cylindrical shape and then welded along the seam. This manufacturing process makes them a cost-effective alternative to seamless pipes, especially for larger diameters and applications where a high-pressure rating isn’t the primary concern.
Welded Pipe Types: There are several types of BAOLAI® welded pipes, classified by their manufacturing process and the orientation of the weld: Electric Resistance Welded (ERW) Steel Pipes, Square and Rectangular Welded Pipes, Galvanized Welded Pipes, and Spiral Welded Pipes(SSAW).
Welded Pipe Products
Welded Pipe Standards
Welded steel pipes are manufactured to various standards to ensure their quality, safety, and suitabilityfor specific applications. These standards cover everything from the steel’s chemical composition andmechanical properties to the manufacturing process, dimensions, and testing requirements. Below are someof the most common and popular standards for BAOLAI steel pipes.
| Standard | Grades | Application | Galvanized |
|---|---|---|---|
| KS D 3507 (JIS G 3452) | SPP (SGP) | General Piping | ✓ |
| KS D 3566 (JIS G 3444) | STK 290, STK 400, STK 500, STK 490, STK 540 | General Structural Purposes | ✓ |
| API 5L (PSL 1) | L175 (A25), L175P (A25P), L210 (A), L245 (B), L290 (X42), L320 (X46), L360 (X52), L390 (X56), L415 (X60), L450 (X65), L480 (X70) | Line Pipe | ✓ |
| API 5L (PSL 2) | L245M (BM), L290M (X42M), L320M (X46M), L360M (X52M), L390M (X56M), L415M (X60M), L460M (X66M), L485M (X70M), L555M (X80M) | Line Pipe | ✓ |
| API 5CT | J-55, K-55, N-80, L-80, P-110 | Casing & Tubing | ✓ |
| ASTM A53 | A, B | Carbon Steel Pipes for Ordinary Piping | ✓ |
| ASTM A795 | A, B | Carbon Steel Pipes for Fire Protection Use | ✓ |
| ASTM A178/179 (SA 192/210) | A, C, D | Boiler Tube | ✓ |
| ASTM A252 | Grade I, Grade II, Grade III | — | ✓ |
| ASTM A500 (Round) | A, B, C, D | Structural Carbon Steel Pipes in Round | ✓ |
| ASTM A500 (Square / Rectangular) | A, B, C, D | Structural Carbon Steel Pipes in Square and Rectangular | ✓ |
| BS 1139 | — | Pipe Scaffoldings | ✓ |
| BS EN 10255 (BS 1387) | S235, S275, S355 | Carbon Steel Pipes for Ordinary Piping | ✓ |
| BS 3059 | 320 | For Boiler | ✓ |
| EN 10210 | S235, S275, S355 | Carbon Steel Pipes for Ordinary Piping | ✓ |
| EN 10217 | S235, S275, S355 | Carbon Steel Pipes for Ordinary Piping | ✓ |
| EN 10219 | S235, S275, S355 | Carbon Steel Pipes for Ordinary Piping | ✓ |
| EN 10225 | S235, S275, S355 | Carbon Steel Pipes for Ordinary Piping | ✓ |
These standards provide a framework for manufacturers to produce safe and reliable welded pipes and forconsumers to specify the exact pipe needed for their particular application. When purchasing welded pipe,it is essential to reference the appropriate standard and grade to ensure the product meets the required performance and safety criteria.
BAOLAI Welded Pipes Manufacturing Process
FAQs
1. What Is Welded Steel Pipe?
▼A welded steel pipe is made by forming steel strip or plate into a round, square, or rectangular shape and welding the edges together. It is widely used for fluid transportation, structural construction, piling, and mechanical applications.
2. How Are Welded Tubes Made?
▼Welded tubes are made by forming steel coil or plate into the required shape and joining the edges with electric resistance or submerged arc welding. The weld seam is then inspected, and the tube may undergo sizing, straightening, cutting, testing, and surface coating.
3. What Are the Different Types of Welded Pipes?
▼The main types of welded pipes are electric resistance welded pipe, longitudinal submerged arc welded pipe, and spiral submerged arc welded pipe. They are commonly known as ERW, LSAW, and SSAW pipes. Square and rectangular welded tubes are also available for structural applications.
4. What Is the Difference Between Welded and Seamless Tube?
▼Welded tubes are formed from steel strip or plate and have a welded seam. Seamless tubes are produced from a solid billet without a longitudinal seam. Welded products are often more economical and available in a wider range of sizes, while seamless tubes are commonly selected for demanding pressure or temperature conditions.
5. What Grade Is Welded Pipe Material?
▼There is no single grade for welded pipe material. Common options include ASTM A53 Grades A and B for general piping, ASTM A500 Grades B and C for structural tubing, and API 5L Grade B, X42, X52, and higher grades for pipelines. The correct grade depends on the application, design pressure, temperature, and required standard.