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- W1967701604 abstract "The use of the modified 9% Cr1% Mo steel grade (grade 91) for the manufacturing of heavy products (forgings, plates) for pressure vessels is evaluated on the following aspects: (i) possibility to produce heavy components (base material) with the required properties, (ii) conditions for welding without cracking, and (iii) availability of welding products and determination of their mechanical properties. Heavy plates with thickness ranging from 20 to 300 mm have been manufactured and tested. All mechanical properties (tensile, Charpy V notch impact, creep…) have been obtained in conformity with the requirements of ASTM specifications and literature data on thinner materials. Some laboratory tests have been carried out to determine the sensitivity of this material to cracking phenomena during welding (cold cracking) or during the postweld heat treatment (reheat cracking). They show that this material does not present major welding difficulties in comparison with more conventional materials used for the manufacture of pressure vessels. To obtain high toughness properties of the weld metal and low residual stresses, the postweld heat treatment temperature was found to be high (750 to 770°C). A significant modification of the weld metal deposit chemistry was found to be necessary to achieve the convenient level of impact properties, but correlatively, a decrease of its creep resistance may be expected for this very low Nb weld material." @default.
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- W1967701604 date "1993-10-01" @default.
- W1967701604 modified "2023-10-17" @default.
- W1967701604 title "Properties of heavy components of steel grade 91 and their welds" @default.
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- W1967701604 doi "https://doi.org/10.1016/0029-5493(93)90016-3" @default.
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