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Materials and finishes for sheet metal parts and CNC machined parts

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HY metals is your best supplier of custom sheet metal parts and machining parts with more than 10 years of experience and ISO9001:2015 cert. We own 6 fully equipped factories including 4 sheet metal shops and 2 CNC machining shops.

We provide professional custom metal and plastic prototyping and manufacturing solutions.

HY Metals is a grouped company providing one-stop service from raw materials to end use products.

We can handle all kinds of materials including Carbon Steel, Stainless steel, Tool steel, Brass, Aluminum, and all kinds of machinable plastic.

Material and Finish for Sheet Metal Parts

For a rough classification, sheet metal materials mainly include Carbon SteelStainless SteelAluminum Alloy and Copper Alloy 4 major categories.

And sheet metal finishes mainly include BrushingPolishingElectroplatingPowder coating , Painting and Anodizing.

Carbon steel is one of the most commonly used materials in sheet metal fabrication. It is much stronger than Aluminum and much cheaper than Stainless steel.

But steel is obviously easy to rust. Then a coating finish will be necessary for steel parts.

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Sheet Metal Parts from carbon steel with Zinc plating

Zinc plating,Nickel plating and chrome plating is commonly used on steel sheet metal parts for anti-corrosion purpose. Sometimes the plating also plays a decorative role.

Stainless steel with 2B finish, just keep the raw material finish.

Sometimes to get a cosmetic surface, we will do brushing finish on stainless steel sheet metal parts.

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Sheet Metal Parts from carbon steel with Powder coated Yellow

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Powder coating is a kind of epoxy resin coating, its thickness always between 0.2-0.6mm,which is much thicker than plating layer. 

Powder Coat finish is suit for some outside sheet metal parts which are not sensitive to tolerance and want to get customized colors.

Stainless steel has a better rust resistance ability, widely used in automation equipment, Medical device, kitchen wares and many kinds of outdoor brackets, shells.

Stainless steel parts usually no need any finish, just keep the raw material with 2B finish or Brushed finish.

Stainless steel with different brushed finish effect

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Aluminum alloy is widely used in aerospace and shells of some equipment to reduce weight and get good rust protection.

At the same time, aluminum alloy also has a very good coloring ability when anodizing.

You can get any beautiful color you want on your aluminum sheet metal parts.

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Custom sheet metal parts with different finish

Table 1. Common Material and Finish for sheet metal parts

Sandblasting and anodizing finishes on aluminum extruded tubes.

Sandblast finish can cover the material defects or tooling marks of machined parts. Anodizing can get the anti-corrosion ability and same time get the ideal color for aluminum parts.

So sandblasting+ anodizing is a very perfect finish option for almost all the cosmetic aluminum parts. 

Materials

Thickness

Finish
Cold rolled steel SPCC

SGCC

SECC

SPTE

Tin plated steel

0.5-3.0mm

Powder coating

(Custom colors are available)

Wet painting

(Custom colors are available)

Silkscreen 

Zinc plating

(Clear,Blue,Yellow)

Nickel plating

Chrome plating

E-coating,QPQ

Hot rolled steel SPHC

3.0-6.5mm

Other mild steel Q235

0.5-12mm

Stainless steel SS304,SS301,SS316

0.2-8mm

2B Finish raw material,

Brushed raw material

Brush, Polishing

Electro-polish

Passivate

Spring steel

Suit for spring clips

SS301-H,1/2H,1/4H,3/4H

 

None
  Mn65

 

 

Heat treatment
Aluminium AL5052-H32,

AL5052-H0

AL5052-H36

AL6061

AL7075

0.5-6.5mm 

Clear chemical film

Anodizing, Hard anodizing

(Custom colors are available)

Powder coating

(Custom colors are available)

Wet painting

(Custom colors are available)

Silkscreen

Sandblasting

Sandblast+ Anodize

Electroless Nickel plating

Brush, Polish

 
Brass Widely used in

Electronic components,

conductive connection parts

0.2-6.0mm 

Tin plating

Nickel plating

Gold plating

Raw material finish

Copper
Beryllium Copper

Phosphor copper

Nickel silver alloy Electronic shielings

0.2-2.0mm

Raw material

 

Material and Finish for CNC Machined parts

The commonly used materials for CNC machining parts including Steel, Stainless steel, Aluminum, Brass, and all kinds of machinable plastic material.

CNC parts usually required a tight tolerance, so the coating layer is not allowed too thick.

Electroplating for steel and copper parts , anodizing for aluminum parts are the most popular finishes.

Material&Finish

Custom CNC machined parts with different finishes

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Sandblasting and anodizing finishes on aluminum extruded tubes.

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Sandblasting and anodizing finishes on aluminum extruded tubes.

Sandblast finish can cover the material defects or tooling marks of machined parts. Anodizing can get the anti-corrosion ability and same time get the ideal color for aluminum parts.

So sandblasting+ anodizing is a very perfect finish option for almost all the cosmetic aluminum parts.

Copper parts with nickel plating finish

For copper alloy parts, the most commonly used surface treatment is tin plating and nickel plating.

Table 2. Common Material and Finish for CNC machining parts

Plastic and Finish Metal alloy   Finish
ABS

Aluminum alloy

Al6061-T6,AL6061-T651 Deburr, Polish, Brush
Nylon AL6063-T6, AL6063-T651 Anodize,Hard anodize
PC AL7075 Sandblast
POM(Delrin) AL1060,AL1100 Electroless nickel plate
Acetal AL6082 Chromate/chrome chemical film
PEEK Stainless steel SUS303,SUS304,SUS304L Passivate
PPSU(Radel® R-5000) SUS316,SUS316L As machined
PSU 17-7 PH, 18-8 PH As machined
PS Tool steel A2,#45,other tooling steel Heat treatment
PEI(Ultem2300) Mild steel Steel 12L14 Nickel/chrome plating
HDPE Brass As machined
PTFE (Teflon) Copper C36000 Nickel/Gold/Tin plating
PMMA(Acrylic) Zinc alloy As machined
PVC Titanium 6Al-4V As machined

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