Shenzhen Ruishuo Metal Co., Ltd. — ISO 9001 & IATF 16949 Certified
chinarswj@shieldingcover.com

Stainless Steel EMI Shielding Cover

Made from 304 stainless steel, offering high strength, high-temperature resistance, and corrosion resistance. Specifically designed for automotive electronics, industrial control, and harsh environment applications. Added magnetic shielding properties provide extra value for low-frequency magnetic interference protection.

High Strength
Heat Resistant
Corrosion Proof
Magnetic Shielding

Stainless Steel (SUS304) Core Properties

~5%
Electrical Conductivity
(%IACS)
High
Magnetic Permeability
800-1000
7.93
Density
(g/cm³)
Excellent
Corrosion Resistance
All Conditions

Detailed Performance Specifications Table

Performance Metric Specification Description
Material Grade SUS304 (JIS) / 1.4301 (DIN) Austenitic stainless steel, containing Cr 18-20%, Ni 8-11%
Electrical Conductivity ~5% IACS Low, but fully adequate for shielding requirements with magnetic compensation
Magnetic Permeability 800-1000 μr High permeability, provides magnetic shielding capability, can block low-frequency magnetic interference
Density 7.93 g/cm³ Similar to steel, lighter than copper, heavier than aluminum
Tensile Strength 515-620 MPa High strength, capable of withstanding high-stress environments
Hardness HV 190-210 Cold working can increase hardness further
Corrosion Resistance Excellent (A+ Grade) Chromium passivation layer, resistant to salt spray and acidic environments, automotive-grade certification
Weldability Moderate (C Grade) Weldable, requires careful control of heat-affected zone to maintain corrosion resistance
Heat Resistance -40°C to 220°C Continuous working temperature exceeds 200°C, ideal for automotive applications
Common Thickness 0.20-0.30 mm Relatively thick to ensure strength and rigidity
Relative Cost 2.0x (vs. tinplate) Moderate material cost, higher processing cost

Advantages vs Limitations

✓ Core Advantages

Excellent High-Temperature Performance Continuous working at 220°C+, twice the capacity of tinplate, ideal for automotive electronics
Full Environment Corrosion Resistance Handles salt spray, acid/alkaline, humidity, and marine environments with long service life
High Strength Design Tensile strength 600MPa+, capable of handling automotive vibration and impact
Magnetic Shielding Properties High permeability blocks low-frequency magnetic interference, optimal for power management and motor control
Automotive Grade Certification Meets IATF 16949, AEC-Q and other automotive reliability standards
Cost Performance Balance Reasonable price compared to copper and white copper materials, balanced performance and cost

⚠ Main Limitations

Low Electrical Conductivity ~5% IACS, RF shielding performance not as good as copper, caution needed for high-frequency applications
Complex Welding Process Requires special welding techniques (TIG recommended) to avoid weld seam corrosion
High Processing Difficulty Higher processing costs, rapid tool wear, lower efficiency
Cold Work Hardening Deep drawing prone to hardening, requires intermediate annealing treatment
Higher Cost for Consumer Electronics Not suitable for ultra-large volume, low-cost consumer products
Not Suitable for Magnetic Shielding Alone Has inherent magnetism, cannot shield magnetic fields, will attract magnetic objects

Recommended Application Scenarios

Stainless steel shielding covers are best suited for the following demanding application environments:

🚗 Automotive Electronics

  • ECU Controllers — Engine management
  • ADAS Systems — Autonomous driving
  • Power Management — High-temperature operation
  • New Energy — Battery management systems

⚙️ Industrial Control

  • PLC/Inverters — Industrial control equipment
  • Power Equipment — High reliability
  • Petrochemical — Corrosive environments
  • Base Station Equipment — Long-term outdoor use

🌊 Marine/Outdoor

  • Offshore Platforms — Salt spray environments
  • Outdoor Communications — Harsh weather
  • Rail Transit — Vibration and impact
  • Servers — Data center cooling

Surface Treatment and Protection

Stainless steel is inherently corrosion-resistant, but surfaces can be further enhanced or beautified:

Standard Treatment

2B Polished: Passivated cold-rolled finish
BA Bright: High-end appearance
Matte: Fingerprint-resistant
Chromium Passivation: Enhanced corrosion resistance

Enhancement Options

Passivation + Nickel Plating: Premium applications
Ceramic Coating: Ultimate protection
Color Treatment: Beauty + protection
Clear Coat: Long-term preservation

Frequently Asked Questions

Q: Why is stainless steel shielding cover more expensive than tinplate?
A: Stainless steel material cost is 2x that of tinplate, and processing difficulty is high (requires special tools), welding process is complex, so final cost increases 30-50%. However, long-term durability and reliability advantages pay off in demanding applications.
Q: What is the difference between SUS304 and SUS316?
A: SUS316 contains molybdenum (Mo), providing superior corrosion resistance, ideal for marine/high-salt environments. Cost is 30-40% higher. SUS304 is adequate for most industrial applications. We recommend SUS304 for automotive, SUS316 for marine use.
Q: Stainless steel is magnetic, how can it be used for magnetic shielding?
A: Stainless steel has high permeability (800+), which can block low-frequency magnetic interference (<10MHz), but it has inherent magnetism, so it cannot shield external magnetic fields. For magnetic shielding capability, we recommend Mu-Metal or copper materials.
Q: Will shielding effectiveness decrease after welding?
A: The heat-affected zone from welding may cause slight performance decrease (5-10%), but overall impact is limited. We recommend passivation treatment after welding to restore and enhance corrosion resistance.
Q: What is the minimum order quantity and lead time?
A: Standard products require 5000 PCS minimum order, with 7-10 day lead time. Small batch sampling of 1000 PCS is acceptable with RMB 300-500 fee. Custom products require engineering complexity evaluation. Please contact us for details.
15 Years+
EMI Shielding Manufacturing Experience
1300+
Global Clients
3M Strokes/Day
Daily Production Capacity
100+ Sets/Month
Tooling Development Capability
Trusted By

Chosen by Global Leading Brands

Serving telecom, consumer electronics, automotive, medical and many other industries

ISO 9001 Certified
IATF 16949 Certified
ISO 14001 Certified
NDA Signed
Manufacturing Strength

Professional EMI Shielding Cover Manufacturing Base

20+ high-precision stamping presses, 20-member professional R&D team, 2-3 day fast delivery, providing full-process service from design to mass production

High-Precision Stamping Workshop Stamping Workshop

High-Precision Stamping Equipment

Equipped with 20+ high-speed precision stamping presses, with a daily stamping capacity of 3 million strokes and accuracy of ±0.01mm.

3M Strokes/Day ±0.01mm Precision
EMI Shielding Can Precision Stamping Manufacturing Tooling Center

In-House Tooling R&D Center

20-member professional R&D team, producing 100+ sets of precision tooling per month, from drawings to finished products in as fast as 2-3 days.

20 R&D Engineers 100+ Sets/Month
Quality Testing Laboratory Quality Lab

Full-Process Quality Control

Incoming inspection → In-process control → Final inspection → Shipping inspection, dual certified with ISO 9001 and IATF 16949.

ISO 9001 IATF 16949
Automotive Grade Solution

Need Stainless Steel
Shielding Cover Customization?

Automotive electronics, industrial control, marine applications—we provide complete solutions meeting IATF 16949 certification. Reliable process, stable quality.

IATF 16949 Certified
15 Years Industry Experience
DFM Review Service