No.4 Finish is most extensively used in Architecture and Elevator Industry. Short grit finish is called No. 4 or Satin, this is a ground unidirectional finish obtained with 120#,180#,240#,320#,400#,600# grit abrasive. It is not highly reflective, but is a good general purpose finish on components which will suffer from fairly rough handling in service.
No. 4 Finish is produced with short, parallel polishing lines. These lines extend uniformly along the length of the coil. It is obtained by mechanically polishing a No. 3 finish with gradually finer abrasives. Depending on requirements, the final finish can be between 120 to 320 grit. High grit numbers create finer polishing lines and more reflective finishes. The surface roughness is typically Ra 25 micro-inches or less. This is a general-purpose finish, and is widely used for kitchen/restaurant equipment, food processing, and dairy equipment.
No 4 finish stainless steel is the workhorse of the light fabrication industry. The easiest of the finishes to maintain, No 4 finish is used for work surfaces, handrails and where appearance is important. A ‘No 4’ surface is produced by cutting the surface with abrasive belts to remove a very small amount of metal without affecting its thickness. This is a ground unidirectional finish obtained with 150 grit abrasive. It is not highly reflective, but is a good general purpose finish on components which will suffer from fairly rough handling in service.
Width: 300mm to 2000mm
Thickness : 0.3mm to 4mm
Standard : ASTM A340/BIS
Length : 2000mm to 6000mm
Non-standard lengths are available on request.
Grades Available : 202, 304, 316, 430,441,443