New generation ferritic and duplex stainless steels: Preliminary study on mechanical and in-service properties of base materials and welded joints

Pekka Nevasmaa, Mika Sirén, Päivi Karjalainen-Roikonen, Justus Hirn, Jyrki Romu, Hannu Hänninen, Ville Sieppi, Hannu-Pekka Heikkinen, Timo Manninen, Jukka Säynäjäkangas

Research output: Contribution to conferenceConference articleScientific

Abstract

This pre-screening study covers two novel ferritic and one duplex stainless steel: the 17% Cr - double Nb+Ti stabilised EN 1.4509 and EN 1.4521, the latter with additional 2% Mo alloying, and the so-called "lean duplex" grade EN 1.4162 with 21.5% Cr - 5% Mn - 1.5% Ni - N. In addition, a third ferritic stainless steel: , the 12% Cr grade EN 1.4003, was included solely for the toughness investigation. The materials were used as sheets of 2 and 3 mm thickness. The three ferritic base materials were characterised by using Charpy-V impact and fracture toughness testing, whereas reference impact and fracture toughness data for EN 1.4162 was acquired from literature. Welded joints were fabricated using gas metal arc (GMAW) and laser welding (LBW). The joints were subjected to tensile testing, as well as microstructural analysis. It can be concluded from the results that, based on the impact and fracture toughness, some of the test materials are well suited to low temperature structural applications, too. Clear differences, however, were observed in the toughness behaviour between the ferritic grades that should be taken into account in materials selection and structural design. Possibilities to reliably predict the fracture toughness T0 reference temperature on the basis of the Charpy T27J/28J data were evaluated. The weld microhardness tests did not reveal any significant softening effect due to welding operations. Microstructural characterisation revealed that retaining the desired ferrite-austenite balance in duplex laser beam welds still remains a challenge.
Original languageEnglish
Publication statusPublished - 2012
MoE publication typeNot Eligible
Event65th Annual Assembly of the International Institute of Welding - Denver, United States
Duration: 8 Jul 201211 Jul 2012

Conference

Conference65th Annual Assembly of the International Institute of Welding
CountryUnited States
CityDenver
Period8/07/1211/07/12

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Fracture toughness
Welds
Stainless steel
Toughness
Gas metal arc welding
Laser beam welding
Ferritic steel
Tensile testing
Structural design
Alloying
Austenite
Microhardness
Laser beams
Ferrite
Screening
Welding
Temperature
Testing

Cite this

Nevasmaa, P., Sirén, M., Karjalainen-Roikonen, P., Hirn, J., Romu, J., Hänninen, H., ... Säynäjäkangas, J. (2012). New generation ferritic and duplex stainless steels: Preliminary study on mechanical and in-service properties of base materials and welded joints. Paper presented at 65th Annual Assembly of the International Institute of Welding, Denver, United States.
Nevasmaa, Pekka ; Sirén, Mika ; Karjalainen-Roikonen, Päivi ; Hirn, Justus ; Romu, Jyrki ; Hänninen, Hannu ; Sieppi, Ville ; Heikkinen, Hannu-Pekka ; Manninen, Timo ; Säynäjäkangas, Jukka. / New generation ferritic and duplex stainless steels: Preliminary study on mechanical and in-service properties of base materials and welded joints. Paper presented at 65th Annual Assembly of the International Institute of Welding, Denver, United States.
@conference{0f710143c18644bdb7493f0a095b9ccd,
title = "New generation ferritic and duplex stainless steels: Preliminary study on mechanical and in-service properties of base materials and welded joints",
abstract = "This pre-screening study covers two novel ferritic and one duplex stainless steel: the 17{\%} Cr - double Nb+Ti stabilised EN 1.4509 and EN 1.4521, the latter with additional 2{\%} Mo alloying, and the so-called {"}lean duplex{"} grade EN 1.4162 with 21.5{\%} Cr - 5{\%} Mn - 1.5{\%} Ni - N. In addition, a third ferritic stainless steel: , the 12{\%} Cr grade EN 1.4003, was included solely for the toughness investigation. The materials were used as sheets of 2 and 3 mm thickness. The three ferritic base materials were characterised by using Charpy-V impact and fracture toughness testing, whereas reference impact and fracture toughness data for EN 1.4162 was acquired from literature. Welded joints were fabricated using gas metal arc (GMAW) and laser welding (LBW). The joints were subjected to tensile testing, as well as microstructural analysis. It can be concluded from the results that, based on the impact and fracture toughness, some of the test materials are well suited to low temperature structural applications, too. Clear differences, however, were observed in the toughness behaviour between the ferritic grades that should be taken into account in materials selection and structural design. Possibilities to reliably predict the fracture toughness T0 reference temperature on the basis of the Charpy T27J/28J data were evaluated. The weld microhardness tests did not reveal any significant softening effect due to welding operations. Microstructural characterisation revealed that retaining the desired ferrite-austenite balance in duplex laser beam welds still remains a challenge.",
author = "Pekka Nevasmaa and Mika Sir{\'e}n and P{\"a}ivi Karjalainen-Roikonen and Justus Hirn and Jyrki Romu and Hannu H{\"a}nninen and Ville Sieppi and Hannu-Pekka Heikkinen and Timo Manninen and Jukka S{\"a}yn{\"a}j{\"a}kangas",
note = "Project code: 79889; 65th Annual Assembly of the International Institute of Welding ; Conference date: 08-07-2012 Through 11-07-2012",
year = "2012",
language = "English",

}

Nevasmaa, P, Sirén, M, Karjalainen-Roikonen, P, Hirn, J, Romu, J, Hänninen, H, Sieppi, V, Heikkinen, H-P, Manninen, T & Säynäjäkangas, J 2012, 'New generation ferritic and duplex stainless steels: Preliminary study on mechanical and in-service properties of base materials and welded joints' Paper presented at 65th Annual Assembly of the International Institute of Welding, Denver, United States, 8/07/12 - 11/07/12, .

New generation ferritic and duplex stainless steels: Preliminary study on mechanical and in-service properties of base materials and welded joints. / Nevasmaa, Pekka; Sirén, Mika; Karjalainen-Roikonen, Päivi; Hirn, Justus; Romu, Jyrki; Hänninen, Hannu; Sieppi, Ville; Heikkinen, Hannu-Pekka; Manninen, Timo; Säynäjäkangas, Jukka.

2012. Paper presented at 65th Annual Assembly of the International Institute of Welding, Denver, United States.

Research output: Contribution to conferenceConference articleScientific

TY - CONF

T1 - New generation ferritic and duplex stainless steels: Preliminary study on mechanical and in-service properties of base materials and welded joints

AU - Nevasmaa, Pekka

AU - Sirén, Mika

AU - Karjalainen-Roikonen, Päivi

AU - Hirn, Justus

AU - Romu, Jyrki

AU - Hänninen, Hannu

AU - Sieppi, Ville

AU - Heikkinen, Hannu-Pekka

AU - Manninen, Timo

AU - Säynäjäkangas, Jukka

N1 - Project code: 79889

PY - 2012

Y1 - 2012

N2 - This pre-screening study covers two novel ferritic and one duplex stainless steel: the 17% Cr - double Nb+Ti stabilised EN 1.4509 and EN 1.4521, the latter with additional 2% Mo alloying, and the so-called "lean duplex" grade EN 1.4162 with 21.5% Cr - 5% Mn - 1.5% Ni - N. In addition, a third ferritic stainless steel: , the 12% Cr grade EN 1.4003, was included solely for the toughness investigation. The materials were used as sheets of 2 and 3 mm thickness. The three ferritic base materials were characterised by using Charpy-V impact and fracture toughness testing, whereas reference impact and fracture toughness data for EN 1.4162 was acquired from literature. Welded joints were fabricated using gas metal arc (GMAW) and laser welding (LBW). The joints were subjected to tensile testing, as well as microstructural analysis. It can be concluded from the results that, based on the impact and fracture toughness, some of the test materials are well suited to low temperature structural applications, too. Clear differences, however, were observed in the toughness behaviour between the ferritic grades that should be taken into account in materials selection and structural design. Possibilities to reliably predict the fracture toughness T0 reference temperature on the basis of the Charpy T27J/28J data were evaluated. The weld microhardness tests did not reveal any significant softening effect due to welding operations. Microstructural characterisation revealed that retaining the desired ferrite-austenite balance in duplex laser beam welds still remains a challenge.

AB - This pre-screening study covers two novel ferritic and one duplex stainless steel: the 17% Cr - double Nb+Ti stabilised EN 1.4509 and EN 1.4521, the latter with additional 2% Mo alloying, and the so-called "lean duplex" grade EN 1.4162 with 21.5% Cr - 5% Mn - 1.5% Ni - N. In addition, a third ferritic stainless steel: , the 12% Cr grade EN 1.4003, was included solely for the toughness investigation. The materials were used as sheets of 2 and 3 mm thickness. The three ferritic base materials were characterised by using Charpy-V impact and fracture toughness testing, whereas reference impact and fracture toughness data for EN 1.4162 was acquired from literature. Welded joints were fabricated using gas metal arc (GMAW) and laser welding (LBW). The joints were subjected to tensile testing, as well as microstructural analysis. It can be concluded from the results that, based on the impact and fracture toughness, some of the test materials are well suited to low temperature structural applications, too. Clear differences, however, were observed in the toughness behaviour between the ferritic grades that should be taken into account in materials selection and structural design. Possibilities to reliably predict the fracture toughness T0 reference temperature on the basis of the Charpy T27J/28J data were evaluated. The weld microhardness tests did not reveal any significant softening effect due to welding operations. Microstructural characterisation revealed that retaining the desired ferrite-austenite balance in duplex laser beam welds still remains a challenge.

M3 - Conference article

ER -

Nevasmaa P, Sirén M, Karjalainen-Roikonen P, Hirn J, Romu J, Hänninen H et al. New generation ferritic and duplex stainless steels: Preliminary study on mechanical and in-service properties of base materials and welded joints. 2012. Paper presented at 65th Annual Assembly of the International Institute of Welding, Denver, United States.