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3 Steps to Match a Stainless Steel Satin (#4) Finish

Posted by Julian Prestidge on 11 April 2019
Julian Prestidge
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A #4 satin finish is one of the most commonly used finishes.  It's ideal for fabrications that need to look great, without being too reflective.  What's more, its relatively easy to achieve - keep reading to learn how...

 

stainless-steel-finishes-2B-3-4-8What is a satin finish?

A satin finish, also called #4 finish, is a brushed finish which can often differ in appearance from batch to batch due to manufacturing variations.  The satin appearance is characterised by a pattern of very fine parallel lines, producing a decorative appearance which is not too reflective.

The #4 brushed finish is used on stainless steel applications where appearance is important, but reflectiveness is unwanted.  For example, kitchen benchtops, hand rails, architecture or automotives.

As a satin finish is created by creating fine scratches in the stainless steel, this does make it slightly less corrosion resistant than a mirror finish as the groves are susceptible to rust.   

#3 is also a brushed finish, but has a much more grainy look, with thicker parallel scratch marks, as seen in the image to the right.

Pros

  • Strong decorative appeal
  • Is not highly reflective
  • Easier to match during fabrication than 2B or mirror finishes

Cons

  • Reduced corrosion resistance
  • Can differ in appearance from batch to batch

  

3 steps to match a #4 Satin Finish on Stainless Steel

With a bit of practice, skill and the right tools it can be done!  Here's a step-by-step guide:

What you'll need:

Deerfos Bora9 ELITE Flap Wheel Spindle Mount1-1 SA331 Disc Combi Flap Wheel
Deerfos Bora9 Fibre Disc, 60 grit+ ELITE Flap Wheel (available in wooden hub or spindle mount) or Portable File Belt - 60 grit+ Deerfos SA331 Velcro Sanding Discs Combination Flap Wheel (available in wooden hub or spindle mount)

 

Step 1. Level the weld

Using a Deerfos Bora9 Fibre Disc, 60 grit+, carefully remove the weld without gauging or distorting the work

Bora9 Fibre Discs use a new generation ceramic grain for aggressive, cool cutting and long life caused by the sharp crystal shaped grain.  They also utilise a specialised top coating to reduce clogging, friction and heat build up, maintaining the sharpness of the grain.

Grinding SS Weld

Deerfos Bora9

Deerfos Bora9 Fibre Disc, 60 grit+

 

Step 2. Sanding out the defects

There's 2 options for sanding out the defects depending on how large the area is that needs blending:

Option 1: Small area

  1. Set the grain with an ELITE Flap Wheel (available in wooden hub or spindle mount) or a Portable File Belt - 60 grit+, moving your sander front-to-back, rather than side-to-side.  You'll want to stay as close to the welded area as possible to minimise the final blending.
  2. Repeat sanding step A, but this time using 120 grit+
Setting the grain - flap wheel

ELITE Flap Wheel Spindle Mount1-1

ELITE Flap Wheel (available in wooden hub or spindle mount) or Portable File Belt - 60 grit+

 

Option 2: Larger area

Now you've leveled the weld and removed any heavy fabrication marks, bring these areas up to the base product finish by sanding the whole piece and get it ready for step 3.

  1. Start with a Deerfos SA331 Velcro Sanding Disc, P120 grit and sand over the area you've used the fibre disc on in Step 1, or where you've marked the fabrication. Setting your sander to 4,000-6,500 RPM, move at a 90° angle to the scratches made in the previous step so make sure the previous scratches are removed.
  2. Repeat sanding step A, but this time using Deerfos SA331 Velcro Sanding Disc, P240 grit 
  3. Repeat sanding step A, but this time using Deerfos SA331 Velcro Sanding Disc, P400 grit
Sanding

SA331 Disc

Deerfos SA331 Velcro Sanding Discs

 

Step 3. Finishing

Attach a Combination Flap Wheel (available in wooden hub or spindle mount)to your sander and set at a medium speed.  Sand in the direction of the grain, making sure to maintain an even pressure.

If sanding on a corner, stainless tape can be applied to cover one side, while sanding the other, so that a sharp finish can be achieved on each side of the corner.

For best results:

  • Always sand in the direction of the grain.
  • Try to maintain an even pressure so that the finish is even..

Setting the grain - flap wheel

Combi Flap Wheel

Combination Flap Wheel (available in wooden hub or spindle mount)

 
Need Products?

No worries - shop online for overnight delivery!

Deerfos Bora9 ELITE Flap Wheel Spindle Mount1-1 SA331 Disc Combi Flap Wheel
Deerfos Bora9 Fibre Disc, 60 grit+ ELITE Flap Wheel (available in wooden hub or spindle mount) or Portable File Belt - 60 grit+ Deerfos SA331 Velcro Sanding Discs Combination Flap Wheel (available in wooden hub or spindle mount)

Topics: Metal Finishing