General commercial quality (CQ)
Characteristics and Applications
Suitable for general forming, bending, welding, such as water pipes, electrical conduit, parts with no strength requirements, cover plates, brackets, etc.
Common specifications.
- JIS G3131 SPHC
- SAE 1008～1023 CQ
Drawing quality (DQ)
Characteristics and Applications
Suitable for stamping processing or applications requiring higher formability, such as bicycle headsets, handle joints, and five-way connectors, etc.
Common specifications.
- JIS G3131 SPHD
- SAE 1006～1008 DQ
Deep drawing quality (DDQ)
Characteristics and Applications
Suitable for ultra-deep drawing or special forming processes, such as automotive shock absorbers, compressor bases, and oil filter housings, etc.
Common specifications.
- JIS G3131 SPHE
- SAE 1006～1008
- DDQASTM A622
Structural Quality (SQ)
Characteristics and Applications
Suitable for simple bending processes, welding and riveting assemblies, with mechanical property requirements, such as shipbuilding, bridges, scaffolding, etc.
Common specifications.
- JIS G3101 SS330～540
- JIS G3106 SM400A～570
- ASTM A36
Automotive Structural Quality (ASQ)
Characteristics and Applications
Suitable for automotive parts material where strict quality and processing requirements for steel material interior are needed. Typically used in applications, such as automotive wheels, suspension systems, chassis beams, brake backing plates, etc.
Common specifications
- JIS G3113 SAPH310～440
- JIS G3134 SPFH490～590Y