1-Pc OK | No MOQ. Upload your 3D fileinstant quote！
Precision Guaranteed | ISO 2768 Standards Our Quality
Free DFM Analysis in Hours | Rapid Delivery Start Your Project
Reliable EU Supply Chain | On-Time Delivery Our Capabilities
For Automotive, Aerospace & Robotics Browse Industries
Get instant quote

Select a language

English
Deutsch (German)
Français (French)
Español (Spanish)
Italiano (Italian)
Polski (Polish)
Русский (Russian)
日本語 (Japanese)
한국어 (Korean)
Melayu (Malay)
中文简体 (Chinese)
CNC Machining Service for Stainless steel 303 | 1.4305 | X8CrNiS18-9

Ready to test your design? Upload your parts for free DFM analysis.

Get instant quote 0

  • Material type

    Metal

  • Material name

    Stainless steel 303 | 1.4305 | X8CrNiS18-9

  • Alternative names

    X8CrNiS18-9, 1.4305

  • Process compatibility

    CNC machining
Grade 303 stands out as the most machineable among all austenitic stainless steel grades. Essentially, it is a machined variant of stainless steel 304. This enhanced machinability is attributed to the elevated sulphur content in its chemical composition. While sulphur improves machinability, it slightly diminishes corrosion resistance and toughness when compared to stainless steel 304.
Sunnyhowe
Mechanical properties
Ultimate tensile strength
580 - 700 MPa
Yield strength
205 - 350 MPa
Young's modulus (modulus of elasticity)
192 - 200 GPa
Elongation at break
40 - 50 %
Physical properties
Corrosion resistance
Moderate
Magnetism
Non-magnetic
UV resistance
Excellent
Weldability
Very Poor
Thermal properties
Maximum service temperature
750 - 925 °C
Thermal expansion coefficent
16.2 - 17.9 10^-6/ºC
Thermal conductivity
15.8 - 16.5 W/(m⋅°C)
Electrical properties
Electrical resistivity
75 - 85 μΩ*cm
ESD Safety
Yes
Post treatments
Post-Processing
Not suitable
Anodizing compatibility
Not suitable
Common applications
Aircraft applications including fittings
Shafts and spindles
Automatic screw machine applications
Drilled or tapped holes
Medical devices with screw threads
Pump and valve parts
Nuts and bolts
Architectural applications

Stainless Steel 303 CNC Machining Applications & Parts

Stainless Steel 303 is the quintessential "free-machining" austenitic stainless steel, modified with sulfur to significantly improve machinability while maintaining good mechanical properties and corrosion resistance. It is ideal for high-volume CNC production.

Typical Parts We Machine from Stainless Steel 303:

  • Automated Machinery: Shafts, gears, nuts, bolts, fittings
  • Food & Beverage Equipment: Valve components, fittings, pump parts
  • Medical & Surgical: Instrument housings, non-implant surgical tool components

Our Machining Advantage:

We leverage the free-machining properties of 303 to achieve high production rates, exceptional surface finishes, and extended tool life, making it a cost-effective choice for complex parts.

Get an Instant Quotefor your custom Stainless Steel 303 parts today.

Tagged: Metal Stainless steel
Heat Treatment Process for CNC Machined Parts - Improve Strength & Durability
29 August 2024
What is Heat Treatment and How Does It Improve CNC-Machined Parts?

Heat treatment strengthens CNC-machined parts by precisely heating/cooling metals to enhance hardness, durability, and stress resistance—critical for aerospace, automotive, and medical components. Improves machinability & extends part lifespan.

6061-T6 Aluminum CNC Machining - Applications & Optimization
29 August 2024
Application and Optimization of 6061-T6 Aluminum in CNC Machining Services

Explore 6061-T6 aluminum in CNC machining: key properties, heat sensitivity challenges, precision control solutions, and best practices for optimal results. Learn how to maximize this versatile material.

CNC Machining Design Guide - Tips for Optimal Results
29 August 2024
Mastering CNC Machining Design: Essential Tips for Optimal Results

Learn essential CNC machining design tips including material selection, DFM principles, tolerance optimization, and CAD best practices. This comprehensive guide helps engineers create cost-effective, high-quality machined parts through proper design techniques.

8 Strategies to Reduce CNC Machining Costs - Maintain High Quality
29 August 2024
8 Proven Strategies to Reduce CNC Machining Costs Without Sacrificing Quality

Discover 8 proven strategies to reduce CNC machining costs while maintaining quality. Learn about material optimization, design simplification, smart tolerancing, and selecting the right manufacturing partner for cost-effective production.

Get Instant Quote

Let's Machine Your Vision, Together.

Ready to transform your CAD file into a custom part? Upload your design to get a free, precise quote.

Get an Instant CNC Quote
ISO 9001:2015 | AS9100D | ISO 13485:2016 | IATF 16949:2016 | Certified Factory | Privacy Policy | Sitemap
Copyright 2025 © Sunnyhowe Co., Ltd. All rights reserved.
Trustpilot