Hot cracking of welded joints of the 7CrMoVTiB 10-10 (T/P24) steel

Adamiec, Janusz

doi:10.1088/1757-899x/22/1/012001

Cited by 5 publications

(6 citation statements)

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“…65 In the case of PWHT, 740°C for 2 h effectively reduced the hardness to ∼250 HV10 and provided good charpy impact energy of ∼250 J (184 ft-lbs). 64,66 Additional work 48 indicates that a PWHT of at least 700°C ( 1292°F) is required to reduce hardness in the weld metal and HAZ below 300 HV. A PWHT of 730°C (1346°F)/1.5 h was needed to restore charpy impact energy values in the weld metal and HAZ to respectable levels (∼100 J, 74 ft-lbs).…”

Section: Mechanical Properties Of Weldsmentioning

confidence: 99%

Microstructural evolution and mechanical properties of Grades 23 and 24 creep strength enhanced ferritic steels

DuPont

Siefert

Shingledecker

2016

International Materials Reviews

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Grades 23 and 24 creep strength enhanced ferritic (CSEF) steels are relatively new materials that have been designed with improved high-temperature strength compared to conventional 2.25Cr-1Mo alloys. These new steels share alloying strategies that were used in the past for CrMo derivatives such as the CrMoV steels. Grades 23 and 24 are often grouped with similar CSEF steels in terms of mechanical properties and fabrication characteristics. However, recent experience indicates that these alloys require more unique care to ensure adequate properties for the intended service in both the base metal and welds. The differences in behaviour between these new steels and more conventional CrMo steels can be attributed to relatively minor variations in composition that lead to rather significant differences in microstructure. This review summarises technical information and practical experience on the manufacture and use of Grades 23 and 24 CSEF steels for power generation applications. Factors that influence the microstructure and strength of base metal are discussed for each alloy along with influences from common fabrication processes such as welding and bending. The results of this review provides manufacturers, fabricators and end users with information that can be applied to help ensure optimal performance of these steels in high-temperature applications associated with power generation.

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Section: Mechanical Properties Of Weldsmentioning

confidence: 99%

Microstructural evolution and mechanical properties of Grades 23 and 24 creep strength enhanced ferritic steels

DuPont

Siefert

Shingledecker

2016

International Materials Reviews

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“…The new type of steel was quickly launched into the market, which caused many technological problems. Industrial practice proved that T24 welded joints are susceptible to thermal, cold and relaxation cracking [1,3]. In this paper, the characteristics of T24 steel and its use for the parts of supercritical pressure boilers are presented on the basis of our individual research and review of relevant literature.…”

Section: Introductionmentioning

confidence: 99%

Microstructure, properties and welding of T24 steel – critical review

Golański¹,

JASAK²,

Słania³

2021

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In this paper a new bainitic 7CrMoVTiB10-10 (T24) steel has been described on the basis of our own research results and a review of relevant literature. The T24 creep-resistant steel is known to be intended for membrane walls in power-generation units operating at supercritical steam parameters. Chemical composition, thermal treatment, microstructure and mechanical properties of T24 steel were characterized. Moreover, the processes of microstructure degradation during ageing/creeping and their effects on mechanical properties have been shown. Weldability of T24 steel and the problems connected with cracking of its homogeneous joints, as well as the methods of preventing them, are given in the paper. K e y w o r d s : bainitic steels, microstructure, welding, cracking

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“…1. Reduction of welding speed to 0.7 m/min solve this problem [13]. Unfortunately, this steel is induced to hot microcrack formation in the crater of weld.…”

Section: Cracking: Results and Analysismentioning

confidence: 99%

“…A -microcracks in crater ("spider veins"), B -hot microcrack in root weld. Welding by Gas Tungsten Arc Welding process (SEM)[16] Morphology of cold crack in 7CrMoVTiB10-10 steel weld metal made by the Submerged Arc Welding process: a) intercrystalline and transcrystalline character; b) intercrytalline character (arrows show brittle broken-out sections)[13]…”

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confidence: 99%

Cracking of High-Strength Steel Welded Joints

Pańcikiewicz¹,

Zielińska‐Lipiec²,

Tasak³

2013

Advances in Materials Sciences

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Fracture evaluation of welded joints in high-strength steels, with bainitic and martensitic structures, is presented and cracking mechanisms discussed. Hot cracks or microcracks formed during welding are further expanded as cold cracks on cooling. The cause of cracking is shown to be low temperature of weld solidification and deformation-induced contraction. Hydrogen can also be an important factor in this cracking.

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Hot cracking of welded joints of the 7CrMoVTiB 10-10 (T/P24) steel

Cited by 5 publications

References 0 publications

Microstructural evolution and mechanical properties of Grades 23 and 24 creep strength enhanced ferritic steels

Microstructural evolution and mechanical properties of Grades 23 and 24 creep strength enhanced ferritic steels

Microstructure, properties and welding of T24 steel – critical review

Cracking of High-Strength Steel Welded Joints

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