Dehydrogenation apparatus, steel sheet production system, and steel sheet production method

Abstract

Provided are a steel sheet dehydrogenation apparatus, a steel sheet production system, and a steel sheet production method capable of producing a steel sheet excellent in hydrogen embrittlement resistance without changing the mechanical properties of the steel sheet. A dehydrogenation apparatus comprises: a housing configured to house a steel sheet coil obtained by coiling a steel strip; and a vibration application device configured to apply vibration to the steel sheet coil housed in the housing so that the steel sheet coil is caused to vibrate at a frequency of 100 Hz to 100,000 Hz and a maximum amplitude of 10 nm to 500 μm.

1 . A dehydrogenation apparatus comprising:
 a housing configured to house a steel sheet coil obtained by coiling a steel strip; and   a vibration application device configured to apply vibration to the steel sheet coil housed in the housing so that the steel sheet coil is caused to vibrate at a frequency of 100 Hz to 100,000 Hz and a maximum amplitude of 10 nm to 500 μm.   
     
     
         2 . The dehydrogenation apparatus according to  claim 1 , wherein the vibration application device comprises an electromagnet having a magnetic pole surface spaced from and facing a surface of the steel sheet coil, and the vibration application device is configured to cause the steel sheet coil to vibrate in response to an external force exerted by the electromagnet on the steel sheet coil. 
     
     
         3 . The dehydrogenation apparatus according to  claim 1 , wherein the vibration application device comprises a vibration element configured to contact the steel sheet coil, and the vibration application device is configured to cause the steel sheet coil to be vibrated by the vibration element. 
     
     
         4 . The dehydrogenation apparatus according to  claim 1 , further comprising a heater configured to heat the steel sheet coil while the vibration is applied to the steel sheet coil. 
     
     
         5 . A dehydrogenation apparatus comprising:
 an uncoiler configured to uncoil a steel sheet coil to feed a steel strip;   a sheet passing device configured to pass the steel strip therethrough;   a coiler configured to coil the steel strip; and   a vibration application device configured to apply vibration to the steel strip being passed through the sheet passing device so that the steel strip is caused to vibrate at a frequency of 100 Hz to 100,000 Hz and a maximum amplitude of 10 nm to 500 μm.   
     
     
         6 . The dehydrogenation apparatus according to  claim 5 , wherein the vibration application device comprises an electromagnet having a magnetic pole surface spaced from and facing a surface of the steel strip being passed, and the vibration application device is configured to cause the steel strip to vibrate in response to an external force exerted by the electromagnet on the steel strip. 
     
     
         7 . The dehydrogenation apparatus according to  claim 5 , wherein the vibration application device comprises a vibration element configured to contact the steel strip being passed, and the vibration application device is configured to cause the steel strip to be vibrated by the vibration element. 
     
     
         8 . The dehydrogenation apparatus according to  claim 5 , further comprising a heater configured to heat the steel strip while the vibration is applied to the steel strip. 
     
     
         9 . The dehydrogenation apparatus according to  claim 1 , further comprising a vibration damper configured to prevent the vibration from being transmitted to the outside of the dehydrogenation apparatus. 
     
     
         10 - 17 . (canceled) 
     
     
         18 . A steel sheet production method comprising a vibration application step of applying vibration to a steel sheet coil obtained by coiling a steel strip so that the steel sheet coil is caused to vibrate at a frequency of 100 Hz to 100,000 Hz and a maximum amplitude of 10 nm to 500 μm, to obtain a product coil. 
     
     
         19 . The steel sheet production method according to  claim 18 , wherein the vibration application step is performed while holding the steel sheet coil at 300° C. or less. 
     
     
         20 . A steel sheet production method comprising:
 a step of uncoiling a steel sheet coil to feed a steel strip;   a sheet passing step of passing the steel strip; and   a step of coiling the steel strip to obtain a product coil,   wherein the sheet passing step includes a vibration application step of applying vibration to the steel strip so that the steel strip is caused to vibrate at a frequency of 100 Hz to 100,000 Hz and a maximum amplitude of 10 nm to 500 μm.   
     
     
         21 . The steel sheet production method according to  claim 20 , wherein the vibration application step is performed while holding the steel strip at 300° C. or less. 
     
     
         22 - 25 . (canceled) 
     
     
         26 . The steel sheet production method according to  claim 18 , comprising:
 a coating or plating step of forming a coating or plating on a surface of a hot-rolled steel sheet or a cold-rolled steel sheet to obtain a coated or plated steel sheet; and   a step of coiling the coated or plated steel sheet to obtain a coated or plated steel sheet coil,   wherein the coated or plated steel sheet coil is the steel sheet coil.   
     
     
         27 - 29 . (canceled) 
     
     
         30 . The steel sheet production method according to  claim 18 , wherein the product coil is composed of a high strength steel sheet having a tensile strength of 590 MPa or more. 
     
     
         31 . The steel sheet production method according to  claim 18 , wherein the product coil includes a base steel sheet having a chemical composition containing, in mass %,
 C: 0.030% or more and 0.800% or less,   Si: 0.01% or more and 3.00% or less,   Mn: 0.01% or more and 10.00% or less,   P: 0.001% or more and 0.100% or less,   S: 0.0001% or more and 0.0200% or less,   N: 0.0005% or more and 0.0100% or less, and   Al: 2.000% or less,   with the balance being Fe and inevitable impurities.   
     
     
         32 . The steel sheet production method according to  claim 31 , wherein the chemical composition further contains, in mass %, at least one element selected from the group consisting of
 Ti: 0.200% or less,   Nb: 0.200% or less,   V: 0.500% or less,   W: 0.500% or less,   B: 0.0050% or less,   Ni: 1.000% or less,   Cr: 1.000% or less,   Mo: 1.000% or less,   Cu: 1.000% or less,   Sn: 0.200% or less,   Sb: 0.200% or less,   Ta: 0.100% or less,   Ca: 0.0050% or less,   Mg: 0.0050% or less,   Zr: 0.0050% or less, and   REM: 0.0050% or less.   
     
     
         33 - 34 . (canceled) 
     
     
         35 . The steel sheet production method according to  claim 18 , wherein the product coil has a diffusible hydrogen content of 0.50 mass ppm or less. 
     
     
         36 . The dehydrogenation apparatus according to  claim 5 , further comprising a vibration damper configured to prevent the vibration from being transmitted to the outside of the dehydrogenation apparatus. 
     
     
         37 . The steel sheet production method according to  claim 20 , comprising:
 a coating or plating step of forming a coating or plating on a surface of a hot-rolled steel sheet or a cold-rolled steel sheet to obtain a coated or plated steel sheet; and   a step of coiling the coated or plated steel sheet to obtain a coated or plated steel sheet coil,   wherein the coated or plated steel sheet coil is the steel sheet coil.   
     
     
         38 . The steel sheet production method according to  claim 20 , wherein the product coil is composed of a high strength steel sheet having a tensile strength of 590 MPa or more. 
     
     
         39 . The steel sheet production method according to  claim 20 , wherein the product coil includes a base steel sheet having a chemical composition containing, in mass %,
 C: 0.030% or more and 0.800% or less,   Si: 0.01% or more and 3.00% or less,   Mn: 0.01% or more and 10.00% or less,   P: 0.001% or more and 0.100% or less,   S: 0.0001% or more and 0.0200% or less,   N: 0.0005% or more and 0.0100% or less, and   Al: 2.000% or less,   with the balance being Fe and inevitable impurities.   
     
     
         40 . The steel sheet production method according to  claim 39 , wherein the chemical composition further contains, in mass %, at least one element selected from the group consisting of
 Ti: 0.200% or less,   Nb: 0.200% or less,   V: 0.500% or less,   W: 0.500% or less,   B: 0.0050% or less,   Ni: 1.000% or less,   Cr: 1.000% or less,   Mo: 1.000% or less,   Cu: 1.000% or less,   Sn: 0.200% or less,   Sb: 0.200% or less,   Ta: 0.100% or less,   Ca: 0.0050% or less,   Mg: 0.0050% or less,   Zr: 0.0050% or less, and   REM: 0.0050% or less.   
     
     
         41 . The steel sheet production method according to  claim 20 , wherein the product coil has a diffusible hydrogen content of 0.50 mass ppm or less.