EN 10217-7 1.4301, 1.4307, 1.4404 Welded Tube

DONGSHANG Stainless produce welded stainless steel tube for pressure purposes, manufacturing and design comply to part 7 of EN 10217 standard, welded tubes made of Austenitic or austenitic-ferritic stainless steel applied for many industries, not only under room temperature condition, and low as well as elevated temperature environment.

Basic specification

Standard EN 10217-7
Tube type welded tube
Grades 1.4301, 1.4307, 1.4404, 1.4541, 1.4571, 1.4462
Finishing as welded, annealing pickling, bright Annealing, polished
Outside diameter 6 up to 508 mm
Thickness 0.5 up to 8 mm

The tubes will be manufactured from hot or cold rolled plate, sheet or strip 1D, 2D, 2E, 2B surface, by longitudinally arc or laser welding. DONGSHANG stainless offer descaled, heat treated, bright annealing condition welded tubes, like symbol W2(b), W2A(b), W2R(b).

We use automatic TIG welding type to weld tubes, and remove inside seam and external seam, making inner and outer surface more smooth and perfect roughness.

EN 10217-7 common steel grades and equivalent AISI grades

Steel name Steel number AISI grade
X2CrNi18-9 1.4307 304L
X5CrNi18-10 1.4301 304
X2CrNiMo17-12-2 1.4404 316L
X6CrNiTi18-10 1.4541 321
X6CrNiMoTi17-12-2 1.4571 316Ti
X2CrNiMo18-15-4 1.4438 317L
X2CrNiMoN22-5-3 1.4462 2205

When tube is finished, chemical composition analysis should be carried out according to EN 10217-7, to ensure the correct grade by direct-reading spectrometer or PMI tester。

The tolerance on outside diameter and wall thickness of tubes should be limited according to EN ISO 1127, precise tolerance should be minimized as much as possible, which has a perfect performance for many applications.

Tolerances on outside diameter and wall thickness of tubes

Outside diameter D mm Tolerance on outside diameter D Tolerance on wall thickness T
Tolerance class Permissible deviation Tolerance class Permissible deviation
D ≤ 168,3 D3 ± 0,75 % or ± 0,3 mm whichever is the greater T3 ± 10 % or ± 0,2 mm whichever is the greater
D4a ± 0,5 % or ± 0,1 mm whichever is the greater
D >168,3 D2 ± 1,0 %

Testing and inspection on EN 10217-7 welded tube

All the inspection and testing finished on welded tubes, 3.1 type Mill Test Certificate should be provided according to EN 10204, quality control department guarantee tubes high quality and good performance in various applications.

  • Tensile test
  • Flattening test
  • Leak tightness test
  • Dimensional inspection
  • Visual examination
  • Eddy current
  • Ultrasonic test
  • Radiographic test

EN 10217-7 welded tube marking

DONGSHANG – 60,3 X 2,0 – EN 10217-7 – X5CrNi18-10 – TC1 – W2A

EN10217-7 Steel Grades Chemical Composition

EN10217-7 Steel Grades Chemical Composition
Steel gradesChemical composition (% by mass – max unless stated)
Steel nameSteel numberCSiMnPSCrMoNiCuNOthersIn 10296-2?
Austenitic steels
X6CrNiTi18-101.45410. 5xC/0.70Yes
X6CrNiNb18-101.45500. 10xC/1.00Yes
XCrNiMoTi17-12-21.45710. 5xC/0.70Yes
Austenitic ferritic steels
X2CrNiMoCuWN25-7-41.45010.0301.001.000.0350.01524.0/26.03.00/4.006.0/8.00.50/1.000.20/0.30W 0.50/1.00No
EN10217-7 1.4301, 1.4307, 1.4404 Welded TubeEN10217-7 stainless steel Welded Tube