Welded Steel Pipe
Welded Steel Pipe Manufacturer & Supplier
Welded steel pipes are one of the most widely used steel products in the global market due to their cost-effectiveness, consistent dimensions, and adaptability across industries. Unlike seamless pipes, which are formed from a solid billet, welded pipes are manufactured by rolling steel plates or coils into cylindrical shapes and welding the seams. This makes them an economical option for transporting fluids, gases, and solids, as well as for use in structural applications.
At Emirerri Steel, we specialize in supplying high-quality welded steel pipes that meet international standards, ensuring reliability, durability, and precision. With a broad product portfolio including ERW, LSAW, SSAW, and HFIW pipes, we cater to industries such as oil & gas, construction, petrochemicals, water treatment, and power generation.
What is a Welded Steel Pipe?
A welded steel pipe is produced by bending steel plates or coils into a cylindrical form and welding the seam using different techniques. The weld can be longitudinal (straight seam) or spiral (helical seam), depending on the production method.
Key characteristics of welded pipes include:
High dimensional accuracy
Smooth surface finish
Cost-effectiveness compared to seamless pipes
Availability in larger diameters and long lengths
Suitability for low to medium pressure applications
Manufacturing Process of Welded Steel Pipe
The production process of welded steel pipe varies depending on the method but generally includes:
Raw Material Selection
High-quality steel plates or coils are chosen based on the desired grade and specification.
Forming
The plate or strip is rolled into a cylindrical shape either by longitudinal bending or spiral rolling.
Welding
The edges are welded together using techniques such as Electric Resistance Welding (ERW), Submerged Arc Welding (SAW), or High-Frequency Induction Welding (HFIW).
Heat Treatment
Pipes may undergo post-weld heat treatment to relieve stress and enhance mechanical properties.
Sizing & Shaping
Pipes are passed through sizing mills to achieve precise dimensions and roundness.
Inspection & Testing
Pipes are subjected to hydrostatic testing, ultrasonic testing, and visual inspection to ensure compliance with ASTM, API, EN, and ISO standards.
Types of Welded Steel Pipes
Welded pipes come in different types based on manufacturing technology and application:
ERW (Electric Resistance Welded) Pipe
Produced by cold-forming steel coils and welding the seam using electrical resistance. Commonly used for water pipelines, scaffolding, and low-pressure applications.
LSAW (Longitudinal Submerged Arc Welded) Pipe
Manufactured by bending plates and welding longitudinal seams. Suitable for high-pressure and long-distance oil & gas pipelines.
SSAW (Spiral Submerged Arc Welded) Pipe
Made by spiral rolling steel plates and welding helically. Ideal for large-diameter pipelines in water, oil, and gas transmission.
HFIW (High-Frequency Induction Welded) Pipe
Welded using high-frequency induction for strong seam bonding. Widely used in structural applications and fluid transportation.
Advantages of Welded Steel Pipe
Welded pipes are chosen for numerous applications due to their distinct advantages:
Cost-Effective Solution – Less expensive compared to seamless pipes, making them economical for large projects.
Availability in Large Sizes – Can be manufactured in large diameters, making them suitable for infrastructure projects.
High Dimensional Accuracy – Consistent wall thickness and surface finish due to controlled manufacturing.
Versatility – Can be used in water supply, oil & gas, structural supports, and mechanical applications.
Customization – Easy to produce with different coatings, thicknesses, and lengths according to project needs.
Applications of Welded Steel Pipe
Welded steel pipes play a critical role across multiple sectors:
Oil & Gas Industry
Used in long-distance transportation pipelines for crude oil, natural gas, and petroleum products.
Construction & Infrastructure
Applied in structural frameworks, bridges, piling, and scaffolding.
Water Supply & Sewage Systems
Ideal for transporting potable water, wastewater, and industrial fluids.
Power Generation & Energy
Used in boilers, heat exchangers, and high-temperature equipment.
Mechanical & Automotive
Employed in exhaust systems, chassis, and machinery parts.
Agriculture & Irrigation
Used in irrigation pipelines, drainage systems, and agricultural machinery.
Standard & Material
Carbon Steel Welded Pipes
ASTM / ASME
ASTM A53 / ASME SA53 → Welded Black & Galvanized Steel Pipe
Grades: A, B
ASTM A135 → Electric-Resistance-Welded (ERW) Steel Pipe for High-Pressure & Boiler Applications
Grades: A, B
ASTM A252 → Welded Steel Pipe for Piling
Grades: 1, 2, 3
ASTM A500 → Cold-Formed Welded Carbon Steel Structural Tubing
Grades: A, B, C, D
ASTM A671 / A672 → Welded Steel Pipe for Pressure Service (Carbon & Alloy Steel, Electric Fusion Welded)
Grades: per customer (usually based on Grade 65, 70, 80 etc.)
API
API 5L → Welded Line Pipe for Oil & Gas
Grades: A25, A, B, X42, X46, X52, X56, X60, X65, X70, X80
EN / DIN
EN 10217-1 → Welded Steel Tubes for Pressure Purposes – Non-Alloy Steels
Grades: P195TR1, P235TR1, P265TR1
DIN 2458 → Welded Steel Pipes for General Purpose
Grades: St 37, St 44, St 52
JIS
JIS G3444 → Carbon Steel Tubes for Structural Purposes
Grades: STK 290, STK 400, STK 490
JIS G3452 → Carbon Steel Pipes for Ordinary Piping
Grades: SGP
Stainless Steel Welded Pipes
ASTM / ASME
ASTM A312 / ASME SA312 → Welded Austenitic Stainless Steel Pipes
Grades: TP304, TP304L, TP316, TP316L, TP321, TP347, TP310S, TP904L
ASTM A358 / SA358 → Electric-Fusion-Welded Austenitic Stainless Steel Pipes for High-Temperature & Corrosive Service
Grades: 304, 304L, 316, 316L, 321, 347, 310S, 904L
ASTM A778 → Welded Austenitic Stainless Steel Tubular Products (non-pressure service)
Grades: 304, 304L, 316, 316L
EN / DIN
EN 10217-7 → Welded Stainless Steel Tubes for Pressure Purposes
Grades: 1.4301 (304), 1.4306 (304L), 1.4541 (321), 1.4401 (316), 1.4404 (316L), 1.4571 (316Ti), 1.4539 (904L)
DIN 17457 → Welded Austenitic Stainless Steel Tubes
Grades: X5CrNi18-10 (304), X2CrNi19-11 (304L), X5CrNiMo17-12-2 (316), X2CrNiMo17-12-2 (316L), X6CrNiTi18-10 (321)
JIS
JIS G3459 → Stainless Steel Pipes for General Service
Grades: SUS304, SUS304L, SUS316, SUS316L, SUS321, SUS347, SUS310S
Alloy Steel Welded Pipes
ASTM / ASME
ASTM A691 / ASME SA691 → Welded Pipes of Carbon & Alloy Steel for High-Pressure Service
Grades: 1Cr-0.5Mo, 1.25Cr-0.5Mo, 2.25Cr-1Mo, 9Cr-1Mo, 91 (X10CrMoVNb9-1)
ASTM A672 / A671 → Electric Fusion Welded (EFW) Carbon & Alloy Steel Pipe for Pressure Service
Grades: based on steel plate chemistry (commonly C60, C65, C70, C75, C80)
EN / DIN
EN 10217-2 → Welded Alloy Steel Tubes for Pressure Purposes
Grades: 16Mo3, 13CrMo4-5, 10CrMo9-10, X10CrMoVNb9-1 (P91), X10CrWMoVNb9-2 (P92)
DIN 17175 (Welded Equivalent) – for High-Temperature Alloy Tubes
JIS
JIS G3462 → Welded Alloy Steel Tubes for Boiler & Heat Exchanger Service
Grades: STBA20, STBA22, STBA23, STBA24
Why Choose Emirerri Steel for Welded Steel Pipes?
Diverse Range – ERW, LSAW, SSAW, and HFIW pipes available in multiple grades.
Quality Assurance – Strict adherence to ASTM, API, EN, and ISO standards.
Global Reach – Trusted supplier to industries worldwide.
Customization – Pipes tailored in length, coating, and finishing as per customer requirements.
Competitive Pricing – High-quality products at cost-effective prices.
On-Time Delivery – Robust supply chain and large inventory for fast delivery.