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Flat steel with round sides

Flat steel with round sides.
Mainly used for spring steel.

This flat steel has rounded sides.
Mainly used as a plate spring for cars and trucks as well as cultivator nails.

Main use

  • Automobile

    Mainly used for leaf springs etc.

  • Agricultural machinery

    Used for various components of tillers and tractors etc.

  • Civil engineering

    Used for grating commonly found in society, segmental materials, and bridge structural members.

  • Construction

    Used for steel structural components such as flanges, diaphragms, and splice plates of H-welding and joints of buildings.

Available size

a : 5~26mm
b : 25~150mm

Download Size Chart

Available steel type

Name of steel type Standard number Code
Rolled steel for general structures JIS G3101
JIS certified
SS400(RKD400)  
SS490 SS540 (SS590)
Rolled steel for welded structures JIS G3106
JIS certified
SM400A SM400B SM400C
SM490A SM490B SM490C
SM490YA SM490YB SM520B
SM520C SM570  
Rolled steel for building structures JIS G3136
JIS certified
SN400A SN400B SN400C
SN490B SN490C  
Rolled bar for building structures JIS G3138
SNR400A SNR400B SNR490B
Round steel for chains JIS G3105
SBC490 SBC690  
Carbon steel for machine structures JIS G4051
JIS certified
S10C~S58C    
Alloy steel for machine structures JIS G4053
JIS certified
SCM435 SCM440 SMn433
SMn438 SMn443  
Structural steel products (H steel)
with guaranteed hardenability
JIS G4052
SCM435H SCM440H SMn433H
SMn438H SMn443H  
Spring steel JIS G4801
SUP6 SUP9 SUP9A
SUP10    
Alloy steel bolts for high temperature applications JIS G4107
SNB7    
Internal standards, etc. Steel for welded structures
KWF490H KWF570H KWF590H
KWF590S SHT590  
High strength steel
570N級~980N級    
Non-tempered steel
SNF45VH  
High manganese carbon steel
SAE1541    
Other (spring steel)
50CrV4 5160H