304 polished stainless steel plate

304 stainless steel polished plate is passivated to form a uniform oxide film, which improves anti-fingerprint and anti-fouling capabilities by 30%, reducing daily maintenance costs. It performs well in the atmosphere, fresh water, and neutral salt solutions, and its corrosion resistance is more than 3 times that of 430 ferritic stainless steel, which can resist conventional industrial pollution and humid environments.

The glossiness of 304 stainless steel mechanical polished plate is ≥85GU, the surface is as bright as a mirror, and the reflectivity is more than 90%, which is suitable for high-end decoration (such as curtain walls and elevator panels);
The roughness of 304 stainless steel electrolytic polished plate is Ra≤0.2μm, there is no mechanical scratch, and the cleanliness is high. It is suitable for food contact (such as tableware) and medical equipment (such as surgical instruments).
It has passed the 24-hour salt spray test (NSS) without rust, which is suitable for coastal buildings, outdoor billboards and other scenes susceptible to salt spray erosion.

Mirror stainless steel plate 304 Specification

Item	Details
Grade	304 / UNS S30400 / 1.4301
Finish Options	2B, BA, No.4 (Brushed), HL (Hairline), 8K (Mirror Polish)
Thickness Range	0.3 mm – 6.0 mm (cold rolled), 6.0 mm – 50 mm (hot rolled)
Width Range	1000 mm, 1219 mm (standard), 1500 mm (custom)
Length Range	2000 mm, 2438 mm, 3000 mm, or custom length
Surface Protection	PE/PVC film on one or both sides (optional)
Standard Compliance	ASTM A240 / JIS G4304 / EN 10088-2
Hardness	≤ 200 HB (Annealed Condition)
Polishing Types	Mirror 8K, Satin/No.4, Hairline HL, Double-sided polish

GNEE provides a spectral chemical composition report (ensuring Ni≥8%, Cr≥18%), a salt spray test report (24 hours without rust spots) and a surface roughness test for each batch, and has passed ISO 9001 certification.
The mirror plate is packed with pearl cotton + wooden boxes to avoid scratches during transportation, and free replacement will be issued if it is damaged upon arrival.

 

Q: Can special sizes or surface effects be customized?
A: Size customization: support fixed-length opening (length ≤ 6000mm, width ≤ 2000mm), the minimum order quantity is usually ≥ 500㎡;
Functional coating: nano anti-fingerprint (contact angle ≥ 110°), anti-scratch coating (hardness ≥ 3H).
Q: How to judge the quality of 304 mirror plate?
A: Material verification: require a material certificate (MTC) to confirm the Cr/Ni content and implementation standards (national standard GB/T 3280, American standard ASTM A240);
Use a spectrometer to detect elemental composition, 304 material Ni ≥ 8%, Cr ≥ 18%, no Mn exceeds the standard (avoid 201 material impersonation).
Surface inspection: Mirror reflectivity: Use a gloss meter to detect, 8K board ≥ 85GU, 10K board ≥ 90GU; Defect inspection: observe under strong light, no orange peel, sand holes, water ripples (ripples ≤ 10μm).
Performance test: Salt spray test: Neutral salt spray (NSS) ≥48 hours without rust (general requirement); Bending test: 180° bending without cracks (suitable for scenarios requiring forming).