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ISO/TR 15608 ISO/TR 15608 Material Group 7.1

ISO/TR 15608 Material Group 7.1: Ferritic stainless steels with C ≤ 0,35 % and 10,5 % ≤ Cr ≤ 30 %;

Features of Ferritic stainless steel ISO/TR 15608 Material Group 7.1

Ferritic stainless steel contains over 12% chromium with less than 0.20% carbon but with no, or very small addition of nickel. Molybdenum is added to some grades to improve the corrosion resistance, while alloying with niobium and/or titanium improves the weldability.

They are non-hardenable by heat treatment and only marginally hardenable by cold rolling. The bodycentred-cubic grain is responsible for ferritic steel’s magnetic nature, and in this it differs from all other types of stainless steel. While not as strong as martensitics, ferritics are highly corrosion resistant. Chromium rich ferritic stainless steels have good oxidation resistance at high temperatures and can be used to make furnace components.

The main disadvantages of the ferritics are:

  • Limited toughness – Not acceptable low temperatures
  • Formability – Good for deep drawing, but not stretch forming due to lower ductility
  • Weldability – Rapid grain growth in thick sections, leads to poor weld toughness in comparison to the austenitics.

Ferritic stainless steels are weldable with conventional welding methods.

NameNumberStandardProductRemarks
403S40300ASTM A-479BarASME BPVC
405
TP405
405
S40500
S40500
S40500
ASTM A-240
ASTM A-268
ASTM A-479
Plate
Smls. & welded tube
Bar
ASME BPVC
ASME BPVC
ASME BPVC
S40800S40800ASTM A-268Smls. & welded tubeASME BPVC
X2CrTi12
TP409
1.4512
S40900

ASTM A-268

Smls. & welded tube

ASME BPVC
409S40910
S40920
S40930
ASTM A-240
ASTM A-240
ASTM A-240
Plate
Plate
Plate
ASME BPVC
ASME BPVC
ASME BPVC
X6Cr17
F430
430
TP430
430
1.4016
S43000
S43000
S43000
S43000

ASTM A-182
ASTM A-240
ASTN A-268
ASTM A-479

Forging
Plate
Smls. & welded tube
Bar

ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
X3CrTi17
439
TP439
439
TP439
TP439
1.4510
S43035
S43035
S43035
S43035
S43035

ASTM A-240
ASTM A-268
ASTM A-479
ASTM A-731
ASTM A-803

Plate
Smls. & welded tube
Bar
Smls. & welded pipe
Smls. & welded pipe

ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
TP430TiS43036ASTM A-268Smls. & welded tubeASME BPVC
X2CrTiNb18
S43932
1.4509
S43932

ASTM A-240

Plate

ASME BPVC
S43940S43940ASTM A-240PlateASME BPVC
S44100ASTM A-240PlateASME BPVC
X2CrMoTi18-2
S44400
18Cr–2Mo
S44400
18Cr–2Mo
1.4521
S44400
S44400
S44400
S44400

ASTM A-240
ASTM A-268
ASTM A-479
ASTM A-731

Plate
Smls. & welded tube
Bars
Smls. & welded pipe

ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
TP446–1
TP446–2
S44600
S44600
ASTM A-268
ASTM A-268
Smls. & welded tube
Smls. & welded tube
ASME BPVC
ASME BPVC
XM–33
TPXM–33
TPXM–33
S44626
S44626
S44626
ASTM A-240
ASTM A-268
ASTM A-731
Plate
Smls. & welded tube
Smls. & welded pipe
ASME BPVC
ASME BPVC
ASME BPVC
FXM–27Cb
XM–27
TPXM–27
XM–27
TPXM–27
S44627
S44627
S44627
S44627
S44627
ASTM A-182
ASTM A-240
ASTM A-268
ASTM A-479
ASTM A-731
Forging
Plate
Smls. & welded tube
Bar
Smls. & welded pipe
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
S44635
25–4–4
S44635
S44635
ASTM A-240
ASTM A-268
Plate
Smls. & welded tube
ASME BPVC
ASME BPVC
S44660
26–3–3
S44660
26–3–3
S44660
S44660
S44660
S44660
ASTM A-240
ASTM A-268
ASTM A-731
ASTM A-803
Plate
Smls. & welded tube
Smls. & welded pipe
Welded tube
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
S44700
29–4
S44700
S44700
S44700
S44700
S44700
S44700
ASTM A-240
ASTM A-268
ASTM A-479
ASTM A-731
Plate
Smls. & welded tube
Bars
Smls. & welded pipe
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
S44735S44735ASTM A-268Smls. & welded tubeASME BPVC
S44800
29–4–2
S44800
S44800
S44800
S44800
S44800
S44800
ASTM A-240
ASTM A-268
ASTM A-479
ASTM A-731
Plate
Smls. & welded tube
Bars
Smls. & welded pipe
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
X3CrNb171.4511EN 10088-2Plate
X2CrMoTi17-11.4513EN 10088-2Plate
X2CrMoNb18-21.4522EN 10088-2Plate
Table: Typical materials