Creping blade and method for its manufacturing
AssigneeVoestalpine Precision Strip GmbH
InventorChris Millward
Life of this patent
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Abstract
The invention relates to a creping blade for the detachment of a travelling paper web from a dryer cylinder, said blade having a working edge to be placed against the cylinder, wherein the creping blade has a tensile strength of 1800-2500 N/mm2 and a hardness of 57-66 HRC in the hardened and tempered condition and wherein the blade is made from a steel, which comprises the following main components (in wt. %): C: 1.2-1.5; Si: 0.1-0.8; Mn: 0.1-0.7; Cr: 4.2-5.2; Mo: 3.0-4.0; V: 3.2-4.2; N: 0.01-0.15; balance Fe and impurities.
Claims18
A creping blade for the detachment of a travelling paper web from a dryer cylinder, the creping blade having a working edge to be placed against the dryer cylinder, wherein the creping blade has a tensile strength of 1800-2500 N/mm2 and a hardness of 57-66 HRC in the hardened and tempered condition, wherein the working edge has a hardness of 630-720 HV1, and wherein the creping blade is made from a cold rolled steel with a steel composition consisting of, in weight % (wt. %):
- C 1.2-1.5
- Si 0.1-0.8
- Mn 0.1-0.7
- Cr 4.2-5.2
- Mo 3.0-4.0
- V 3.2-4.2
- N 0.01-0.15
- optionally
- Cu≦0.5
- Al≦0.06
- W≦0.5
- Ni≦3
- Co≦3
- Nb≦1
- Ti≦0.1
- Zr≦0.1
- Hf≦0.1
- B≦0.01
- REM≦0.2
- Ca≦0.01
- Mg≦0.01
- P≦0.03
- S≦0.03
- O≦0.015
- balance Fe and impurities.
A creping blade for the detachment of a travelling paper web from a dryer cylinder, the creping blade having a working edge to be placed against the dryer cylinder, the creping blade being formed from a cold rolled strip made from a steel having a microstructure resulting from austenitizing at an austenitizing temperature of 1000-1040° C., hardening by quenching in a bath of molten lead or lead alloy at a temperature of 310-340° C., and tempering twice at a tempering temperature of 610-630° C., the creping blade having a tensile strength of 1800-2500 N/mm2 and a hardness of 57-66 HRC in the hardened and tempered condition, the working edge having a hardness of 630-720 HV1, and the steel having composition consisting of, in weight % (wt. %):
- C 1.2-1.5
- Si 0.1-0.8
- Mn 0.1-0.7
- Cr 4.2-5.2
- Mo 3.0-4.0
- 3.2-4.2
- N 0.01-0.15
- Cu 0.05-0.25
- balance Fe and impurities.
Dependencies are inferred from the claim text.