Stainless steel welded tubes are a key component in modern industrial piping systems. Whether in the chemical and petrochemical industries, food processing, or power plant engineering, a stainless steel welded tube offers a cost-efficient and standards-compliant solution for demanding applications with high requirements in corrosion resistance, dimensional accuracy, and availability.
At WITTE TUBE, we supply high-quality welded stainless steel tubing designed for long-term performance under pressure, temperature fluctuations, and exposure to aggressive media.
Welded Tubes – Advantages & Applications
Compared to seamless alternatives, a welded tube provides signifi cant benefits:
● High dimensional accuracy and uniform wall thickness
● Economical production for large volumes
● Wide range of material grades, diameters, and surface finishes
● Fast availability from our extensive stock
Our stainless steel welded tubes are manufactured according to the highest quality and testing standards. They are suitable as a reliable pipe for welding in industrial systems operating under high pressure and temperature conditions.
Applications include:
● Chemical and petrochemical plants
● Energy and power generation
● Food and beverage industry
● Mechanical and plant engineering
● Offshore and environmental technology
Standards & Specifications – ISO 1127 and DIN EN 10217-7
A high-quality stainless steel welded tube must meet both mechanical and regulatory requirements. At WITTE TUBE, we exclusively supply products manufactured in compliance with internationally recognized standards, including ISO 1127 and DIN EN 10217-7.
● DIN EN ISO 1127: This standard specifies the dimensions, tolerances, and permissible deviations for cold- or hot-finished welded stainless steel tubes. It ensures international comparability, dimensional accuracy, and reliability in further processing.
● DIN EN 10217-7: This standard applies to welded stainless steel tubes intended for pressure purposes, particularly in plant engineering and pressure equipment construction. It defi nes the technical delivery conditions for welded tubes used in demanding industrial applications.
What do ISO 1127 and DIN EN 10217-7 stand for?
● ISO 1127 specifies metric dimensions and tolerances for stainless steel tubes.
● DIN EN 10217-7 defines production, testing, and quality requirements for pressure-resistant stainless steel welded tubes.
Tolerances for Stainless Steel Welded Tubes
Tolerances mainly concern:
● Outside diameter
● Wall thickness
● Ovality
● Straightness
These parameters are critical for precise integration into piping systems and for subsequent fabrication processes such as TIG welding stainless steel tubing.
According to ISO 1127, tolerances are defi ned depending on the selected series (e.g., Series 1 or Series 2). Our stainless steel welded tube sizes meet the highest standards of dimensional precision and are fully documented in our dimension tables.
Bending of Welded Tubes – Key Considerations
When bending a stainless steel welded tube, the position of the weld seam is crucial. Ideally, the seam should be located on the inner or outer radius of the bend to avoid material overstressing or crack formation.
Wall thickness, material grade, and bending radius signifi cantly infl uence formability. For tight bending radii, we recommend specially adapted tube types and, if required, annealed versions to reduce residual stress.
As a high-quality pipe for welding, our welded tubes are also optimized for further processing, including orbital and TIG welding stainless steel tubing in demanding industrial environments.
Technical Data & Stainless Steel Welded Tube Sizes
Our stock range of stainless steel welded tubes includes:
● Outside diameters from 6 mm up to more than 900 mm
● Wall thicknesses from 1.24 mm up to over 50 mm, depending on schedule
● Surface fi nishes according to customer requirements (e.g., ground, pickled, bright annealed)
A complete overview of all available stainless steel welded tube sizes and wall thicknesses can be found in our stainless steel tube dimension table, including comparison according to ISO 1127 and ASME B36.10 / B36.19.
Materials & Quality Standards
Our welded stainless steel tubing is available in standard and special grades:
| Material No. | Grade | Properties |
| 1.4404 | AISI 316L | Suitable for chemical applications |
| 1.4539 | 904L | High corrosion resistance |
| 1.4462 | Duplex | High mechanical strength |
| 1.4547 | 254SMO | Designed for highly aggressive media |
Certifications:
● EN 10217-7 TC1 / TC2
● ISO 1127
● AD 2000 W2 / W10
● ASME/ASTM A312, A928
● NACE MR0175 / ISO 15156
With over 40 years of experience and a 12,000 m² warehouse in Rastede, WITTE TUBE ensures immediate availability of high-quality stainless steel welded tubes for industrial applications worldwide. Our certified processing and cutting center enables customized solutions tailored precisely to your project requirements.
