Grade Profile

1.4547 / S31254 Welded Stainless Steel Tube

EHG manufactures welded stainless steel tube in grade 1.4547 (S31254) at our facility in Steinberg, Germany. A premium super-austenitic grade purpose-built for hot chloride environments such as seawater and flue gas desulfurization.

Also Known As

1.4547 welded stainless steel tube is specified and sold internationally under several equivalent names:

EN (Kurzname) X1CrNiMoCuN20-18-7
ASTM / AISI (USA) S31254
UNS (USA) S31254
Common / trade name 254 SMO

254 SMO® is a registered trademark of Outokumpu, referenced here only as an equivalent/comparison designation. EHG is not affiliated with, sponsored by, or endorsed by Outokumpu.

Technical Data

EN 1.4547 / X1CrNiMoCuN20-18-7 — ASTM / AISI S31254.

Chemical Composition (% by mass, cast analysis)

Carbon (C) ≤ 0.020 %
Silicon (Si) ≤ 0.70 %
Manganese (Mn) ≤ 1.00 %
Phosphorus (P) ≤ 0.030 %
Sulfur (S) ≤ 0.010 %
Nitrogen (N) 0.18 - 0.25 %
Chromium (Cr) 19.5 - 20.5 %
Copper (Cu) 0.50 - 1.00 %
Molybdenum (Mo) 6.0 - 7.0 %
Nickel (Ni) 17.5 - 18.5 %

Mechanical Properties (room temperature)

0.2 % proof strength (Rp0.2) ≥ 300 MPa
1 % proof strength (Rp1.0) ≥ 340 MPa
Tensile strength (Rm) 650 - 850 MPa
Elongation after fracture (A, longitudinal) ≥ 35 %
Elongation after fracture (A, transverse) ≥ 30 %

Corrosion Resistance Index

PREN (Cr + 3.3×Mo + 16×N) 44.9 Seawater-resistant — meets the NACE MR0175 / ISO 15156 sour-service threshold (PREN ≥ 40)

Available Standards

1.4547 welded stainless steel tube from EHG can be ordered to the following standards:

General & mechanical engineering tube DIN EN 10296-2
Welded tube for pressure purposes DIN EN 10217-7
Food & pharmaceutical industry tube DIN EN 10357
Pipe classes for process plants DIN 21057-11
Corrosion-resisting steels (supplementary conditions) SEW 470
Welded pipe (USA) ASTM A312 / ASME SA-312
Boiler, superheater & heat-exchanger tube (USA) ASTM A249 / ASME SA-249

Typical Applications

What our customers build with 1.4547 / S31254 welded tubes:

  • Seawater desalination — premium piping and heat exchangers.
  • Flue gas desulfurization — ducting in the hottest, most chloride-laden gas streams.
  • Pulp & paper bleach plants — tube exposed to aggressive bleaching chemicals.

Alloy Surcharge History

EUR/kg — February 2013 to September 2026

September 2026 (current) 8.73 €/kg
2.00 4.00 6.00 8.00 10.00 12.00 20132015201720192021202320252026 8.73 €/kg

Drag across the chart to zoom in on a period — use "Reset zoom" to return to the full history.

Period€/kg
September 20268.73
August 20268.56
July 20268.67
June 20268.41
May 20267.93
April 20268.02

Last 12 Months

Period€/kg
September 20268.73
August 20268.56
July 20268.67
June 20268.41
May 20267.93
April 20268.02
March 20267.56
February 20267.09
January 20266.50
December 20256.81
November 20256.83
October 20256.87

Full history available at ehg-steinberg.de.

View full history as a table
PeriodAlloy surcharge (€/kg)
September 20268.73
August 20268.56
July 20268.67
June 20268.41
May 20267.93
April 20268.02
March 20267.56
February 20267.09
January 20266.50
December 20256.81
November 20256.83
October 20256.87
September 20256.63
August 20256.40
July 20256.50
June 20256.43
May 20256.71
April 20257.12
March 20257.20
February 20257.29
January 20257.24
December 20247.16
November 20247.15
October 20246.91
September 20247.01
August 20247.49
July 20247.90
June 20247.66
May 20247.13
April 20247.10
March 20246.76
February 20246.71
January 20246.37
December 20236.93
November 20237.53
October 20237.89
September 20237.80
August 20237.56
July 20237.93
June 20238.23
May 20238.70
April 202311.21
March 202312.10
February 202310.62
January 20239.41
December 20228.43
November 20228.27
October 20227.71
September 20227.31
August 20227.92
July 20228.77
June 20229.03
May 202210.40
April 20229.07
March 20227.72
February 20227.32
January 20227.15
December 20216.98
November 20216.69
October 20216.82
September 20216.62
August 20216.38
July 20215.68
June 20214.98
May 20214.74
April 20214.95
March 20214.84
February 20214.44
January 20214.21
December 20204.06
November 20203.83
October 20203.81
September 20203.50
August 20203.49
July 20203.56
June 20203.70
May 20203.49
April 20203.73
March 20204.03
February 20203.99
January 20203.96
December 20194.33
November 20194.95
October 20195.00
September 20194.58
August 20194.17
July 20194.12
June 20194.18
May 20194.34
April 20194.31
March 20194.00
February 20193.77
January 20193.91
December 20184.09
November 20184.17
October 20184.24
September 20184.42
August 20184.38
July 20184.59
June 20184.38
May 20184.15
April 20184.19
March 20184.07
February 20183.78
January 20183.45
December 20173.55
November 20173.31
October 20173.32
September 20172.98
August 20172.86
July 20173.03
June 20173.30
May 20173.59
April 20173.65
March 20173.44
February 20173.45
January 20173.39
December 20163.05
November 20162.89
October 20162.72
September 20162.84
August 20162.67
July 20162.52
June 20162.35
May 20162.09
April 20162.12
March 20162.03
February 20162.11
January 20162.14
December 20152.31
November 20152.37
October 20152.37
September 20152.63
August 20152.87
July 20153.21
June 20153.34
May 20153.46
April 20153.51
March 20153.58
February 20153.55
January 20153.59
December 20143.50
November 20143.69
October 20144.21
September 20144.11
August 20144.12
July 20144.30
June 20144.04
May 20143.39
April 20142.98
March 20142.92
February 20142.87
January 20142.79
December 20132.87
November 20132.76
October 20132.88
September 20132.91
August 20133.00
July 20133.25
February 20133.64

Need 1.4547 / S31254 Welded Stainless Steel Tube?

Configure your dimensions and specification, or get in touch directly for a quote.

Configure Your Tube View Alloy Surcharge PDF

The technical data, standards references and alloy surcharge history on this page are provided for general information only. EHG makes no warranty as to their accuracy or completeness and accepts no liability for decisions made on this basis. Always verify current specifications against the applicable official standard (e.g. DIN EN 10088, EN 10095, ASTM/ASME) before using them for design, procurement or manufacturing.