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ISO/TR 15608 ISO/TR 15608 Material Group 10.3

ISO/TR 15608 Material Group 10.3: Austenitic ferritic stainless steels (LeanDuplex) with Ni ≤ 4 %

What are Lean-Duplex steels?

Lean-Duplex steels are low Ni-alloyed, the duplex microstructure contributes to the high strength and high resistance to stress corrosion cracking (SCC). Lean duplex stainless steels are a subset of duplex stainless steels that are formulated with lower amounts of expensive alloying elements, like nickel and molybdenum, while still maintaining good corrosion resistance and higher strength than conventional austenitic stainless steels. In duplex stainless steel, N is an important element that is used extensively for the enhancement of PREN (22 – 27), stabilisation of the austenite phase, and improvement of strength.

For comparison: Austenitic steels (PERN = 24-25); Lean Duplex steels (PREN=22-27), Standard Duplex steels (PREN =28-35); Super Duplex (PREN = 39-45); Hyper Duplex steels (PREN >45). The pitting corrosion resistance is better than that of austenitic AISI 304 (EN 1.4307) and can reach the level of AISI 316L (EN 1.4404).

Weldability of Lean Duplex steels

Duplex stainless steel grades generally have good weldability and they can be welded using most of the welding methods used for austenitic stainless steels. In particular, N is very effective in maintaining the austenite phase of welds. Typical recommended heat inputs are 15-20 KJ/cm with a max. 150 °C interpass temperature. Nitrogen to the shielding gas and use of nitrogen-based backing gas can further improve the austenite formation and make the weld metal more resistant to pitting. It is not recommend pre- or post-weld- ing heat treatments. Only complete solution annealing heat treatment may be considered.

Name/Grade/TypeNumberStandardProductAlloyRemarks

S32003
S32003
S32003
S32003
S32003
S32003
S32003
ASTM A-240
ASTM A-789
ASTM A-790
ASTM A-928
Plate
Smls. and welded tube
Smls. and welded pipe
Welded pipe

ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
X2CrNiN22-2



1.4062
S32202
S32202
S32202
S32202
EN 10088-2
ASTM A-479
ASTM A-789
ASTM A-790
ASTM A-815
Plate
Bar
Smls. and welded tube
Smls. and welded pipe
Fitting

ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
X2CrMnNiN21-5-1





1.4162
S32101
S32101
S32101
S32101
S32101
S32101
EN 10088-2
ASTM A-240
ASTM A-479
ASTM A-789
ASTM A-790
ASTM A-815
ASTM A-928
Plate
Plate
Bar
Smls. and welded tube
Smls. and welded pipe
Fitting
Welded pipe

ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC

S82011
S82011
ASTM A-789
ASTM A-790
Smls. and welded tube
Smls. and welded pipe
ASME BPVC
ASME BPVC
S82012ASTM A-240PlateASME BPVC
S82031ASTM A-240PlateASME BPVC
Table: Typical materials