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Quality Grade
Quality Grade AAAAA AAAAA AAAAA AAAAA AAAAA
Material Stainless Steel 201 301 301 304 304L 316 316 316L 316L
Chemical Composition C ≤ 0.15% ≤ 0.15% ≤ 0.15% ≤ 0.08% ≤ 0.03% ≤ 0.08% ≤ 0.08% ≤ 0.03% ≤ 0.03%
Si ≤ 0.75% ~ 1% ≤ 1% ≤ 1% ≤ 1% ≤ 1% ≤ 1% ≤ 1% ≤ 1% ≤ 1%
Mn 5.5% ~ 7.5% ≤ 2% ≤ 2% ≤ 2% ≤ 2% ≤ 2% ≤ 2% ≤ 2% ≤ 2%
P ≤ 0.06% ≤ 0.035% ≤ 0.035% ≤ 0.035% ≤ 0.045% ≤ 0.045% ≤ 0.045% ≤ 0.045% ≤ 0.045%
S ≤ 0.03% ≤ 0.03% ≤ 0.03% ≤ 0.03% ≤ 0.03% ≤ 0.03% ≤ 0.03% ≤ 0.03% ≤ 0.03%
Ni 3.5% ~ 5.5% 6% ~ 8% 6% ~ 8% 8% ~ 10.5% 8% ~ 12% 10% ~ 14% 10% ~ 14% 10% ~ 14% 10% ~ 14%
Cr 16% ~ 18% 16% ~ 18% 16% ~ 18% 18% ~ 20% 18% ~ 20% 16% ~ 18% 16% ~ 18% 16% ~ 18% 16% ~ 18%
Mo 2% ~ 3% 2% ~ 3% 2% ~ 3% 2% ~ 3%
N ≤ 0.25%
Hypoallergenic（Nickel release： Excessive nickel release may cause allergies or skin irritation,high nickel content does not necessarily trigger allergies.） Nickel Release Standard Limit values（EU REACH，US CPSIA）：Jewelry ≤ 0.5（µg/cm²/week）；Piercing items ≤ 0.2（µg/cm²/week）
Raw Surface 2.0-8.0 1.0-4.5 1.0-4.5 0.2-0.8 0.1-0.5 0.05-0.3 0.05-0.3 0.03-0.2 0.03-0.2
Polished 1.5-6.5 0.8-3.8 0.8-3.8 0.1-0.6 0.1-0.4 0.02-0.2 0.02-0.2 0.01-0.15 0.01-0.15
Brushed 1.8-7.0 0.9-4.2 0.9-4.2 0.2-0.7 0.1-0.4 0.03-0.25 0.03-0.25 0.02-0.18 0.02-0.18
Corrosion Resistance（Salt Spray Test：24 hours ≈ 6–12 months in normal exposure） 24 hours Minor rust spots Minor rust spots Minor rust spots No change No change No change No change No change No change
48 hours Visible rust stains Small rust patches Small rust patches Individual pitting corrosion No change No change No change No change No change
72 hours Extensive rust More rust patches More rust patches Slight pitting corrosion Slight rust No corrosion No corrosion No corrosion No corrosion
96 hours Structural damage Structural damage Structural damage Rust spots Mild stains Thin oxide layer Thin oxide layer Thin oxide layer Thin oxide layer
168 hours Severe corrosion Significant corrosion Significant corrosion Localized corrosion Mild corrosion Stable oxide film Stable oxide film Stable oxide film Stable oxide film
Polishing Surface Finish Reference
Front Basic polish, slightly rough Standard polishing, relatively smooth Deep polishing, smooth
but with minor spots/textures		 Deep polishing, no visible
spots/textures to naked eye		 No spots/textures visible under 10x magnification
Sides/Bottom Minimal or no polish Basic polishing, slightly rough Standard polishing, relatively smooth Deep polishing, smooth
but with minor spots/textures		 Deep polishing, no visible
spots/textures to naked eye
Grooves/Corners Unpolished Unpolished Basic polishing, slightly rough Basic polishing, relatively smooth Standard polishing,
very smooth
Edges Untreated, risk of skin scratches Basic treatment,
may cause skin irritation		 Standard treatment,
unlikely to cause skin irritation 		Rounded edges, comfortable to wear Rounded edges,
very comfortable to wear
Plating Color Lasting 1–3 months 3–6 months 6–12 months 12–24 months 24-36 months
Titanium Undercoat 0.1-0.15um 0.2-0.3um 0.3-0.5um 0.5-0.8um 0.5-0.8um
Gold Layer 0-0.01um 0.02-0.03um 0.03-0.05um 0.08-0.1um 0.1-0.15um
Wear Resistance Test 0-12 hours 24-48 hours 48-72 hours 72-96 hours 96-118 hours
Salt Spray Test 12 hours 24 hours 48 hours 72 hours 72 hours