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Stainless Steel Machining

CNC Stainless Steel Machining or Stainless steel machined parts services: Stainless steel CNC machining components, Stainless steel CNC turned parts, Stainless Steel rapid prototypes.
  • Precision Stainless Steel Machining

  • OEM, ODM

KYLT CNC Stainless Steel Machining Service

The value of stainless steel lies in its strength, heat resistance, and excellent corrosion resistance. In fact, corrosion resistance is the main difference between stainless steel and ordinary steel.

In KYLT, Stainless Steel Machining or Stainless steel machined parts services has 2 kinds: 

  1. Stainless steel CNC machining components

  2. Stainless steel CNC turned parts

stainless screw by CNC machining

Stainless Steel Screws

CNC machined stainless steel parts

Stainless Steel CNC Machining Prototypes

Stainless steel CNC machining part

Stainless Steel CNC Milling Part

stainless steel rapid prototypes by CNC Milling & Turning

Stainless Steel CNC Turning Parts

Introduction to Stainless Steel for CNC Machining

What distinguishes stainless steel from regular steel is the addition of chromium to its alloys. All stainless steel compositions contain a minimum of 10.5% chromium. The inclusion of chromium enhances the corrosion resistance of these steels. Different grades of stainless steel incorporate various alloying elements that further improve their resistance to corrosion, heat treatability, and machinability. It's important to note that heat treatment can significantly impact the mechanical properties of the metal.

Stainless steels can be categorized based on their crystalline structure, which includes austenitic, ferritic, martensitic, and duplex types:

  1. Austenitic stainless steel, found in 300- and 200-series stainless steels, is highly malleable and does not harden during machining. When annealed, they are also non-magnetic.

  2. Ferritic stainless steels are magnetic and offer better thermal conductivity than austenitic stainless steels. They cannot be hardened through heat treatment.

  3. Martensitic stainless steel, such as grades 416 and 420, can be hardened through various aging or heat treatment methods.

  4. Duplex stainless steel, also known as austenitic-ferritic, represents stainless steel grades specially designed for enhanced corrosion resistance. Duplex steels are commonly used in industrial and architectural applications.

Due to its versatility, some form of stainless steel is commonly employed in virtually every industry.

When machining stainless steels note must be taken of the following:

  1. The machining equipment must be sturdy and rigid with up to 50% more power than equipment used for mild steels.

  2. Machine tools and the workpiece must be firmly held to prevent vibration and chatter.

  3. Cutting tools, either high speed steel or carbide must be kept sharp at all times, sharpening at regular intervals being preferable to sharpening when blunt.

  4. Good lubricants should be used, especially for heavy cuts at relatively slow speeds. Thinning with paraffin is recommended for higher speed finishing cuts to keep the workpiece and tools as cool as possible.

  5. The depth of cut must be such as to prevent the tool from riding in the workpiece. This is particularly important with austenitic grades to avoid work hardening and burnishing.

  6. The largest possible tool must be used in order to dissipate heat.

  7. Interrupted cutting must be avoided where possible as a greater degree of work hardening occurs as the tool enters the workpiece. The prime rule should be “get in and get out” with all tooling.

Stainless Steel Machining Tool Geometry

Tool geometries are similar for both austenitic and ferritic grades and the summarized below for HSS:


Cutting edge angel ± 135°, point angel ± 138°, lip relief angle varies from 16° for 3mm diameter to 8° for 25mm diameter.


Rake angle 3° to 8°, margin width 0.125 to 0.35mm, relief angles primary 4° to 6°, secondary double primary chamfer angle 30° to 35°, chamfer relief angle 4° to 5°, helix angle ± 7°, lead angle ± 2°.


Straight fluted for > 12mm holes, spiral fluted for smaller holes hook/rake angle 15° to 20°, back relief angle 10°, chamfer angle/length plug taps 9° to 10° (3.5 to 4.5 threads) taper taps 4° to 5°, (8 to 10 threads).


Rake angle 20° to 30°, throat angle 20° to 25°, face angle 1.5°.


Back rake angle ferritics 5°, austenitic 0°, side rake angle ferritics 8°, austenitics 10° to 15°, end relief, side relief and end cutting edge angles all 5°.


Back rake angle 4° to 10°, end relief angles 7° to 10°, side relief and clearance angles 1° to 5°.


Back rake angle 6° to 10°, end relief angle 7° to 10°, side relief angle 2° to 3°, end cutting edge angle 10° to 15° for small diameters and shallow cuts, decreasing to 5° for larger diameters.


Sulphurised, chlorinated or sulphur-chlorinated mineral oils and emulsifiable oils are used. In cases of high pressure the latter must contain sulphonated or chlorinated additions.


After machining it is essential to remove the cutting fluid and degrease the workpiece. This is usually done with conventional degreasing agents or solvents. In situations where the workpiece has been subjected to excessive heating or where maximum corrosion resistance is required, it may be necessary to passivate and/or pickle and passivate. If this is required refer to the section on post Fabrication Treatment.

KYLT Precision Stainless steel CNC machining services (milling & turning service), Fast prototyping. +008615195010186

0086 15195010186
Gounan Industrial Park, Changzhou, Jiangsu