Patent ID: 11919062
Assignee: POSCO CO., LTD
Field: nan (nan)
Classification: CPC nan | IPC B  C

Claim 0:
1. A method of manufacturing a hot press-formed member, the method comprising:
heating a blank of an aluminum-based plated steel sheet in a heating furnace;
removing the heated blank from the heating furnace and conveying the removed blank between an upper mold portion and a lower mold portion of a mold, mounted on a press, to be seated; and
performing a forming process after the upper mold portion of the mold is in contact with the seated blank,
wherein the heating furnace is a continuous heating furnace comprising section A, section B, and section C provided in a conveying direction of a blank,
heating in section A satisfies conditions specified by a figure ‘abcde’ having cumulative in-furnace maintaining times and in-furnace atmospheric temperature coordinates of approximately a(0.2 min, 750° C.), b(1.0 min, 750° C.), c(1.0 min, 800° C.), d(1.5 min, 900° C.), and e(0.2 min, 900° C.),
heating in section B satisfies conditions specified by a figure ‘fghi’ having cumulative in-furnace maintaining times and atmospheric temperature coordinates of approximately, f
   ⁡
   (
   
    
     1.3
     +
     
      
       
        t
        -
        1.2
       
       0.6
      
      ×
      0.5
         
      min
     
    
    ,
    
     930
     ⁢
     °
     ⁢
        
     
      C
      .
     
    
   
   )
  
  ,
     
 

 
  
   g
   ⁡
   (
   
    
     3.8
     +
     
      
       
        t
        -
        1.2
       
       0.6
      
      ×
      0.5
         
      min
     
    
    ,
    
     930
     ⁢
     °
     ⁢
        
     
      C
      .
     
    
   
   )
  
  ,
 

 
  
   h
   ⁡
   (
   
    
     3.3
     +
     
      
       
        t
        -
        1.2
       
       0.6
      
      ×
      0.5
         
      min
     
    
    ,
    
     960
     ⁢
     °
     ⁢
        
     
      C
      .
     
    
   
   )
  
  ,
  and
 

 
  
   i
   ⁡
   (
   
    
     0.8
     +
     
      
       
        t
        -
        1.2
       
       0.6
      
      ×
      0.5
         
      min
     
    
    ,
    
     960
     ⁢
     °
     ⁢
        
     
      C
      .
     
    
   
   )
  
  ,
 

 and
heating in section C satisfies conditions specified by a figure ‘jklm’ having cumulative in-furnace maintaining times and atmospheric temperature coordinates of approximately, j
   ⁡
   (
   
    
     3.7
     +
     
      
       
        t
        -
        1.2
       
       0.6
      
      ⁢
         
      min
     
    
    ,
    
     870
     ⁢
     °
     ⁢
        
     
      C
      .
     
    
   
   )
  
  ,
  
   k
   ⁡
   (
   
    
     11.7
     +
     
      
       
        t
        -
        1.2
       
       0.6
      
      ×
      2
      ⁢
         
      min
     
    
    ,
    
     870
     ⁢
     °
     ⁢
        
     
      C
      .
     
    
   
   )
  
  ,
 

 
  
   l
   ⁡
   (
   
    
     7.03
     +
     
      
       
        t
        -
        1.2
       
       0.6
      
      ×
      2
      ⁢
         
      min
     
    
    ,
    
     940
     ⁢
     °
     ⁢
        
     
      C
      .
     
    
   
   )
  
  ,
  and
 

 
  
   m
   ⁡
   (
   
    
     2.53
     +
     
      
       
        t
        -
        1.2
       
       0.6
      
      ⁢
         
      min
     
    
    ,
    
     940
     ⁢
     °
     ⁢
        
     
      C
      .
     
    
   
   )
  
  ,
 

a highest atmospheric temperature of section C is lower than a highest atmospheric temperature of section B,
t denotes a thickness of a blank and a unit thereof is millimeters (mm),
when the thickness t is 1.5 mm or less, and an atmospheric temperature of section B is more than 930° C. to less than 940° C.,
when the thickness t is greater than 1.5 mm, and an atmospheric temperature of section B is more than 940° C. to 960° C. or less, and
a plating layer of the blank has a thickness of 20 μm or more.