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US 12,421,662 B2Granted
Yankee drying cylinder and a tissue paper making machine
AssigneeValmet Corporation
InventorOla Jonsson
Life of this patent
Estimating the term…
Abstract
The invention relates to steel Yankee cylinders for tissue-making machines and tissue-making machines using such steel Yankee cylinders wherein the outer surface (9) of the cylindrical shell of the steel Yankee cylinder is formed by a steel of the grade P690 as defined in European Standard EN 10028-6:2017 or a similar steel.
Claims15
A steel Yankee drying cylinder (2) comprising:
- a cylindrical shell (3) having two axial ends (4, 5), and
- an end wall (6, 7) being joined to each axial end (4, 5) by means of a circumferential weld bead (8), the cylindrical shell (3) further having an outer surface (9) and an inner surface (10),
- wherein the outer surface (9) of the cylindrical shell (3) is made of a steel having the following composition by weight:
- C equal to or greater than 0.12% and equal to or less than 0.20%
- Si equal to or greater than 0.10% and equal to or less than 0.80%
- Mn equal to or greater than 1.00% and equal to or less than 1.70%
- Cr equal to or greater than 0.10% and equal to or less than 1.50%
- Mo equal to or greater than 0.30% and equal to or less than 0.70%
- V equal to or greater than 0.005% and equal to or less than 0.12%
- Nb equal to or greater than 0.005% and equal to or less than 0.060%
- B equal to or greater than 0.0006% and equal to or less than 0.005%
- P equal to or less than 0.025%
- S equal to or less than 0.010%
- N equal to or less than 0.015%
- Cu equal to or less than 0.30%
- Ni equal to or less than 2.50%
- Ti equal to or less than 0.05%
- Zr equal to or less than 0.15%
- Al equal to or less than 0.01%
- Remainder iron and impurities.
17 more elements
A cylindrical shell (3) for a Yankee cylinder that comprises an outer surface (9) made of a steel having the following composition by weight:
- C equal to or greater than 0.12% and equal to or less than 0.20%
- Si equal to or greater than 0.10% and equal to or less than 0.80%
- Mn equal to or greater than 1.00% and equal to or less than 1.70%
- Cr equal to or greater than 0.10% and equal to or less than 1.50%
- Mo equal to or greater than 0.30% and equal to or less than 0.70%
- V equal to or greater than 0.005% and equal to or less than 0.12%
- Nb equal to or greater than 0.005% and equal to or less than 0.060%
- B equal to or greater than 0.0006% and equal to or less than 0.005%
- P equal to or less than 0.025%
- S equal to or less than 0.010%
- N equal to or less than 0.015%
- Cu equal to or less than 0.30%
- Ni equal to or less than 2.50%
- Ti equal to or less than 0.05%
- Zr equal to or less than 0.15%
- Al equal to or less than 0.01%
- Remainder iron and impurities.
14 more elements
Dependencies are inferred from the claim text.