As a world-leading supplier, GNEE brings over 18 years of specialized expertise to the stainless steel foil industry. We offer a comprehensive portfolio of ultra-thin, precision-rolled stainless steel foils across a wide range of steel grades, including austenitic (304, 304L, 316, 316L, 321, 310S), ferritic (430, 409), martensitic (420, 410), duplex (2205, 2507), and precipitation-hardening steels (such as 17-7PH). Our stainless steel foils are available in thicknesses ranging from 0.01 mm to 0.50 mm, with production strictly adhering to international standards including ASTM, JIS, EN, and DIN.
Our commitment to quality is anchored in a rigorous ISO 9001:2015 certified Quality Management System (QMS). Furthermore, we provide EN 10204 3.1 Mill Test Certificates (MTC) and can arrange independent third-party inspections by SGS or BV upon customer request, ensuring full product traceability and premium reliability.
Product Name：304 Stainless Steel Ultra Thin Foil. Material Grade：AISI 304 / UNS S30400 / EN 1.4301 / SUS304. Standard：ASTM A240, ASTM A666, JIS G4305, EN 10088-2. Thickness：0.005 mm – 0.10 mm (5–100
Standard;ASTM A240 / ASTM A480 / EN 10088-2 / JIS G4305. Material Grade;UNS S31600, UNS S31603, EN 1.4401, EN 1.4404. Manufacturing Process;Cold Rolled, Bright Annealed (BA). Thickness;0.03–0.50 mm
Product Name:310S Soft Annealed Foil. Material Grade:AISI 310S / UNS S31008 / EN 1.4845 / SUS310S. Manufacturing Process:Cold Rolled, Solution Annealed, Soft Annealed. Temper:Soft Annealed (O
GNEE offers a complete range of precision stainless steel foil products in various thicknesses, widths, and material grades to meet demanding applications in electronics, medical devices, battery manufacturing, precision stamping, aerospace, automotive, and industrial manufacturing.
Austenitic stainless steel foils: 201, 301, 304, 304L, 316, 316L, 310S, 321, etc.
Ferritic stainless steel foils: 409, 410, 430, 439, 441, etc.
Martensitic stainless steel foils: 420, 440A, 440C, etc.
Duplex stainless steel foils: 2205, 2507, UNS S31803, UNS S32750, etc.
High-performance stainless steel foils: 904L, 254SMO, 17-7PH, and other high-strength or high-corrosion-resistant alloys.
By surface finish: 2B, BA (Bright Annealed), No.4, polished, mirror finish, matte finish, precision rolled finish, and customized surface treatments.
By product type: Ultra-thin stainless steel foil (0.01–0.10 mm), precision stainless steel foil, hard stainless steel foil, soft annealed foil, slit foil, edge-trimmed foil, precision-width foil, coil foil, and custom-cut stainless steel foil, all available with customized thickness, width, temper, edge condition, and protective film according to customer specifications.
301 Stainless Steel Foil
Cold Rolled 304 Stainless Steel Foil
316 316L Stainless Steel Foils
309S and 310S Heat-Resistant Stainless Steel Foil
430 Stainless Steel Foil
2205 Stainless Steel Foil
The following are the equivalent grades of our stainless steel coils.
Series
ASTM/AISI Grade
UNS Code
EN/DIN Standard
JIS Grade
Austenitic
304
S30400
1.4301
SUS304
304L
S30403
1.4307
SUS304L
316
S31600
1.4401
SUS316
316L
S31603
1.4404
SUS316L
321
S32100
1.4541
SUS321
310S
S31008
1.4845
SUS310S
Ferritic
430
S43000
1.4016
SUS430
409L
S40903
1.4512
SUS409L
Martensitic
410
S41000
1.4006
SUS410
420
S42000
1.4021
SUS420
Duplex
2205
S32205
1.4462
SUS32205
2507
S32750
1.4410
SUS32750
Super Alloy
904L
N08904
1.4539
SUS890L
304 316 Stainless Steel Foils Production Process
GNEE Stainless Steel produces 304 and 316 stainless steel foils through a series of precision processes, including melting, hot rolling, cold rolling, annealing, and surface finishing. To process the material into ultra-thin foil—typically less than 0.1 mm thick—while ensuring uniform thickness, highly specialized twenty-high rolling mills must be used.
Application: Precision stamped spring contacts, retaining clips, and EMI shielding components for aerospace electrical connectors and avionics systems.
304 316 430 Stainless steel Foils supplier - GNEE
GNEE Stainless Steel utilizes advanced 20-high Sendzimir rolling mills capable of controlling thickness tolerances to within ±0.001 mm (±1 μm), ensuring high consistency during precision etching and stamping. An in-line tension leveling process is employed to completely eliminate internal stresses generated during coiling, guaranteeing that the material remains free from warping or deformation after laser cutting, etching, or deep drawing.
Quality Control & Testing
GNEE guarantees that every coil of stainless steel foil undergoes comprehensive quality inspections and is supplied with a Material Test Certificate (MTC) compliant with EN 10204 3.1 standards.
304 Stainless Steel Mill Test Certificate
430 Stainless Steel Mill Test Certificate
2205 Stainless Steel Mill Test Certificate
316L Stainless Steel Mill Test Certificate
409L Stainless Steel Mill Test Certificate
310S Stainless Steel Mill Test Certificate
Chemical Analysis: Spectrometers are used to ensure that the content of elements such as Cr, Ni, and Mo fully complies with AISI/ASTM standards.
Mechanical Testing
Micro-Hardness Test
Roughness Test (Ra)
Surface Inspection (Pinhole and Defect Scanning): A 100% online surface defect detection system monitors for scratches, black spots, or pinholes in real-time.
Thickness measurement
304 SS foils PMI
Professional Seaworthy Packaging
Core Support: Aluminum, steel, or high-strength paper cores (inner diameters of 200mm, 300mm, 400mm, or 500mm) are provided based on customer requirements to prevent core collapse.
Interleaving: Neutral moisture-proof paper or specialized film interleaving is used to prevent adhesion or scratching between foil layers.
Vacuum Sealing: Each roll is vacuum-packed with desiccant to completely seal out air and prevent edge oxidation during transit.
Export-Grade Wooden Cases: Reinforced, fumigation-free wooden cases are used; these undergo shock and compression testing to ensure suitability for long-distance sea or air transport.
FAQ
Q: What is the difference between stainless steel foil and stainless steel strip?
A:Stainless steel foil generally refers to material with a thickness below 0.50 mm, while stainless steel strip usually has a thickness above 0.50 mm. Stainless steel foil offers tighter thickness tolerances, better flatness, and superior surface quality for precision manufacturing.
Q: What are the thickness tolerances for precision foils?
A: For ultra-thin foils, we maintain a precision tolerance of ±1% to ±3% (e.g., ±0.001mm for 0.05mm foil). We use 20-high Sendzimir mills with AGC (Automatic Gauge Control) systems to ensure absolute consistency across the entire coil length.
Q: Is 304 or 316L stainless steel foil magnetic?
A: In their annealed (soft) state, 304 and 316L are austenitic and non-magnetic. However, during the intense cold-rolling process used to make foils, the crystal structure can partially transform into martensite, making the foil slightly magnetic. If zero magnetism is required, we can perform specialized Bright Annealing to restore non-magnetic properties.
Q: 304 vs. 316L Foil: Which one should I choose?
A: 304 Foil: The best all-rounder. Excellent strength and corrosion resistance for electronics, gaskets, and general industrial use.
316L Foil: Higher Molybdenum content. Choose 316L for marine environments, chemical processing, medical implants, or hydrogen fuel cells where superior pitting corrosion resistance is critical.
Q: Does the SS foil have pinholes?
A: For foils below 0.03mm, "pinholes" are a common industry challenge. GNEE uses on-line laser surface inspection and high-purity billets to ensure that foils intended for vacuum seals, lithium batteries, or sensors are guaranteed pinhole-free.
Q: What is the maximum width available for 0.05mm foil?
A:Our precision rolling mills can produce foils up to 600mm wide (depending on the grade and thickness). We also offer precision slitting down to 3.0mm width with micron-level edge accuracy.
Q: Are the edges burr-free?
A: Yes. For stamping and battery applications, burrs can cause short circuits or die damage. We use carbide precision slitting tools to ensure the edges are clean, smooth, and burr-free (burr height controlled within 5% of thickness).
We're professional stainless steel foil manufacturers and suppliers in China, specialized in providing high quality customized service. Be free to wholesale stainless steel foil in stock here and get free sample from our factory. For price consultation, contact us.
