Advances in High Strength Steel Technology for Naval Hull Construction

Czyryca, Ernest J.

doi:10.4028/www.scientific.net/kem.84-85.491

Cited by 68 publications

(57 citation statements)

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“…But carbon being deleterious for welding, 2) over past two decades there have been attempts to substitute these HY series of steels by developing a new series of low-carbon low-alloy copper-bearing steels with improved weldability maintaining similar strength and toughness. 1,3) Lower carbon in these steels helps in achieving better weldability, whereas, copper enhances strength by precipitation hardening. 4) ASTM A710 grade steel (0.07 % C, 0.5 % Mn, 0.4 % Si, 0.75 % Cr, 0.9 % Ni, 0.2 % Mo, 1.15 % Cu and 0.0 2% Nb) was first to be developed in these low-carbon copper-bearing steels in late seventies for use in offshore structures.…”

Section: Introductionmentioning

confidence: 99%

“…1) These are essentially quenched and tempered low to medium carbon low alloy steels which derive their strength mainly from carbon. But carbon being deleterious for welding, 2) over past two decades there have been attempts to substitute these HY series of steels by developing a new series of low-carbon low-alloy copper-bearing steels with improved weldability maintaining similar strength and toughness.…”

Section: Introductionmentioning

confidence: 99%

“…[5][6][7][8][9][10] Based on its chemistry, HSLA-80 steel was developed by United States Navy in early eighties as a substitute for HY-80 grade of steel. 1,[11][12][13][14] High strength (Minimum yield strength of 552 MPa), good low temperature impact toughness (81 J at Ϫ85°C) and good weldability of HSLA-80 steel made it a candidate for construction of naval ships and submarines. It can also be used for making components of many engineering bodies such as heavy duty tracks, bridges, earth moving equipment and off-shore structures.…”

Section: Introductionmentioning

confidence: 99%

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Weldability and Microstructural Aspects of Shielded Metal Arc Welded HSLA-100 Steel Plates.

Dhua¹,

Mukerjee²,

Sarma

2002

ISIJ International

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HSLA-100 steel with 14 mm thickness in quenched and tempered condition was shielded metal arc welded (SMAW) with 2 kJ/mm heat input using basic flux coated filler rods without any pre or post welding heat treatments. The steel was found to be welded satisfactorily in this condition without developing any defect. Optical microscopy studies revealed typical cast dendritic structure in the weld metal and coarse bainite in grain-coarsened area of the heat-affected zone (HAZ). Transmission electron microscopy (TEM) study confirmed incidence of mixed structure of martensite laths and bainite in weld metal, while, it was mainly of bainite laths in HAZ with evidence of martensite-austenite (M-A) constituent and massive ferrite. The yield strength (YS), ultimate tensile strength (UTS) and Charpy V-notch (CVN) impact energy of the weld metal (YS-695 MPa, UTS-842 MPa and CVN-105 J at Ϫ50°C) and HAZ (YS-790 MPa, UTS-891 MPa and CVN-130 J at Ϫ50°C) were found satisfactory although HAZ properties were inferior to the base metal properties. The hardening of HAZ was not very significant in this steel under the present welding condition.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Weldability and Microstructural Aspects of Shielded Metal Arc Welded HSLA-100 Steel Plates.

Dhua¹,

Mukerjee²,

Sarma

2002

ISIJ International

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“…[1][2][3][4][5][6]8) are seen to be produced in the thermomechanically processed steels. When the steel is tempered at 450°C for one hour after air cooling from the finish rolling temperature, 750°C in schedule 1, the major microstructural constituent appears to be acicular bainite (a B )/martensite (a M ) (Fig.…”

Section: Microstructuresmentioning

confidence: 99%

“…HSLA 80, HSLA 100 and ultra low carbon bainitic (ULCB) steels are the present day versions of the new family of steels. [1][2][3] Recently, it has been demonstrated that TMCP, followed by direct water cooling envisages an improvement in properties of the copper bearing HSLA steels. 4) The sub-zero impact properties of these steels are reported to be poor if too much of MA constituents are present in the microstructure in the form of ribbons or thin films.…”

Section: Introductionmentioning

confidence: 99%

Effect of Thermomechanical Processing on the Microstructure and Properties of a Low Carbon Copper Bearing Steel.

Banerjee¹,

Banerjee²,

Datta³

2001

ISIJ International

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A boron treated copper bearing HSLA steel containing austenite formers like manganese and nickel, somewhat lower in amount than that in HSLA 100 variety of steel is chosen for the study. The role of thermomechanical processing on the microstructure and mechanical properties of the above steel has been investigated. Differential scanning calorimetric study is carried out for understanding the precipitation behaviour of copper in HSLA steel under the influence of boron. The microstructure of the experimental steel is found to consist of laths of martensites and bainite. MA constituents of ribbon like morphology are observed at the lath boundaries. Higher strength properties of the steel are attributed to the presence of finely distributed precipitates of copper and microalloy carbides.

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The Structure And Properties of a Thermo‐mechanically Processed Low Carbon High Strength Steel

Ghosh

Shukla²,

Das

et al. 2006

steel research international

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Research efforts were given towards development of low carbon high strength steels since recent past. The present study deals with the development of a low carbon high strength steel alloyed with Mn, Ni, Mo, Cu and microalloyed with Ti and Nb. The steel was subjected to three stage controlled rolling operation followed by accelerated cooling. The structure and properties of the steel at various processing conditions were evaluated. Microstructural observation reveals predominantly lath martensite along with twinned martensite structure at all processing conditions. High strength values at higher finish rolling temperatures have been obtained due to fine martensitic structure along with tiny precipitates of microalloying carbide and carbonitride. The strength value increases marginally at lower finishing temperature due to comparatively finer lath size of martensite and increased precipitation density of carbides, carbonitrides along with Cu particles. The variation in impact toughness properties at different finish rolling temperatures is found to be negligible at ambient and subambient temperatures. The formation of stable and large TiNmCN particles during casting have impaired the impact toughness values at ambient and at -40°C temperatures.Keywords: high strength steel, thermo-mechanical processing, twinned martensite, microalloying precipitate, toughness steel research into 77 (2006) No. 4

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Advances in High Strength Steel Technology for Naval Hull Construction

Cited by 68 publications

References 0 publications

Weldability and Microstructural Aspects of Shielded Metal Arc Welded HSLA-100 Steel Plates.

Weldability and Microstructural Aspects of Shielded Metal Arc Welded HSLA-100 Steel Plates.

Effect of Thermomechanical Processing on the Microstructure and Properties of a Low Carbon Copper Bearing Steel.

The Structure And Properties of a Thermo‐mechanically Processed Low Carbon High Strength Steel

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