Grade Profile

1.4828 / 309Si Welded Stainless Steel Tube

EHG manufactures welded stainless steel tube in grade 1.4828 (309Si) at our facility in Steinberg, Germany. A silicon-alloyed heat-resisting austenitic grade for scaling/oxidation resistance at sustained high temperature.

Also Known As

1.4828 welded stainless steel tube is specified and sold internationally under several equivalent names:

EN (Kurzname) X15CrNiSi20-12
ASTM / AISI (USA) 309Si
UNS (USA) S30900
AISI (USA) 309
AFNOR (France) Z15CNS20.10
BS (UK) 309S24
Common / trade name 309 Si

Technical Data

EN 1.4828 / X15CrNiSi20-12 — ASTM / AISI 309Si.

Chemical Composition (% by mass, cast analysis)

Carbon (C) ≤ 0.20 %
Silicon (Si) 1.50 - 2.50 %
Manganese (Mn) ≤ 2.00 %
Phosphorus (P) ≤ 0.045 %
Sulfur (S) ≤ 0.015 %
Nitrogen (N) ≤ 0.11 %
Chromium (Cr) 19.00 - 21.00 %
Nickel (Ni) 11.00 - 13.00 %

Mechanical Properties (room temperature)

0.2 % proof strength (Rp0.2) ≥ 230 MPa
1 % proof strength (Rp1.0) ≥ 270 MPa
Tensile strength (Rm) ≥ 550 MPa
Elongation after fracture (A, longitudinal) ≥ 30 %
Elongation after fracture (A, transverse) ≥ 30 %

Available Standards

1.4828 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 1.4828 / 309Si welded tubes:

  • Furnace muffles & radiant tube — silicon addition improves scaling resistance at sustained heat.
  • Heat-treatment baskets & fixtures — components cycling through high temperature.
  • Burner & combustion equipment — parts exposed to oxidizing high-temperature atmospheres.

Alloy Surcharge History

EUR/kg — February 2013 to September 2026

September 2026 (current) 3.22 €/kg
1.00 2.00 3.00 4.00 5.00 6.00 20132015201720192021202320252026 3.22 €/kg

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

Period€/kg
September 20263.22
August 20263.20
July 20263.39
June 20263.39
May 20263.21
April 20263.18

Last 12 Months

Period€/kg
September 20263.22
August 20263.20
July 20263.39
June 20263.39
May 20263.21
April 20263.18
March 20263.08
February 20263.03
January 20262.70
December 20252.73
November 20252.70
October 20252.66

Full history available at ehg-steinberg.de.

View full history as a table
PeriodAlloy surcharge (€/kg)
September 20263.22
August 20263.20
July 20263.39
June 20263.39
May 20263.21
April 20263.18
March 20263.08
February 20263.03
January 20262.70
December 20252.73
November 20252.70
October 20252.66
September 20252.66
August 20252.62
July 20252.70
June 20252.75
May 20252.87
April 20253.03
March 20253.04
February 20253.06
January 20253.06
December 20242.99
November 20243.06
October 20242.90
September 20242.93
August 20243.08
July 20243.36
June 20243.39
May 20243.14
April 20243.09
March 20242.92
February 20242.81
January 20242.86
December 20232.98
November 20233.12
October 20233.23
September 20233.23
August 20233.24
July 20233.50
June 20233.71
May 20233.73
April 20233.93
March 20234.39
February 20234.54
January 20234.43
December 20224.03
November 20224.00
October 20223.95
September 20223.87
August 20224.05
July 20224.70
June 20224.78
May 20225.82
April 20224.90
March 20223.96
February 20223.67
January 20223.57
December 20213.42
November 20213.22
October 20213.22
September 20213.18
August 20212.96
July 20212.77
June 20212.71
May 20212.60
April 20212.71
March 20212.73
February 20212.53
January 20212.36
December 20202.26
November 20202.15
October 20202.17
September 20202.02
August 20202.01
July 20201.99
June 20202.00
May 20201.86
April 20201.90
March 20202.02
February 20202.14
January 20202.13
December 20192.42
November 20192.62
October 20192.61
September 20192.31
August 20192.02
July 20191.97
June 20191.99
May 20192.11
April 20192.09
March 20191.96
February 20191.77
January 20191.82
December 20181.96
November 20182.04
October 20182.09
September 20182.21
August 20182.31
July 20182.41
June 20182.22
May 20182.07
April 20182.04
March 20181.98
February 20181.91
January 20181.85
December 20171.97
November 20171.80
October 20171.80
September 20171.59
August 20171.56
July 20171.67
June 20171.76
May 20171.92
April 20172.08
March 20172.00
February 20172.04
January 20171.96
December 20161.75
November 20161.61
October 20161.50
September 20161.60
August 20161.48
July 20161.29
June 20161.32
May 20161.23
April 20161.27
March 20161.20
February 20161.27
January 20161.35
December 20151.48
November 20151.47
October 20151.45
September 20151.60
August 20151.73
July 20151.84
June 20151.92
May 20151.91
April 20151.99
March 20152.00
February 20151.95
January 20152.01
December 20141.88
November 20141.98
October 20142.19
September 20142.12
August 20142.12
July 20142.12
June 20142.07
May 20141.78
April 20141.61
March 20141.55
February 20141.52
January 20141.47
December 20131.53
November 20131.48
October 20131.55
September 20131.58
August 20131.56
July 20131.69
February 20131.80

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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.