Passivated 18/8 Stainless Steel Vs 316

When comparing Passivated 18/8 Stainless Steel vs 316 Stainless Steel, buyers often want to know the difference in corrosion resistance, chemical composition, mechanical strength, and long-term performance. Both are popular grades in the stainless steel market, but they serve slightly different purposes depending on the environment and required durability.

 

Why passivate stainless steel?
Passivation removes free iron from the surface and strengthens the chromium oxide film, preventing rust and contamination.

 

What is Passivated 18/8 stainless steel?

Passivated 18/8 stainless steel is a type of stainless steel that has undergone a chemical process to improve its corrosion resistance. The "18/8" refers to its composition of approximately 18% chromium and 8% nickel, which provides a natural protective layer. The passivation process chemically removes free iron and other surface contaminants left from manufacturing, allowing a thicker, more uniform, chromium-rich passive layer to form, greatly enhancing its protection against rust.

 

What is Passivated 316 stainless steel?

Passivated 316 stainless steel is a 316 stainless steel that has undergone a post-fabrication treatment to enhance its natural corrosion resistance. This process involves using an acid bath (typically nitric or citric acid) to remove free iron particles left from manufacturing and to create a thicker, more uniform chromium-oxide layer on the surface. This enhanced passive layer acts as a protective barrier against corrosion and rust.

 

Passivated 18/8 stainless steel vs 316: Key differences

Property	Passivated 18/8 Stainless Steel (AISI 304)	316 Stainless Steel (AISI 316 / EN 1.4401)
Chemical Composition	18% Cr, 8% Ni	16–18% Cr, 10–14% Ni, 2–3% Mo
Passivation Treatment	Nitric or citric acid to remove free iron, improve corrosion resistance	Similar process; enhances oxide layer after forming/welding
Corrosion Resistance	Excellent in mild environments	Superior, especially against chlorides and acids
Density	8.0 g/cm³	8.03 g/cm³
Tensile Strength	520–750 MPa	515–760 MPa
Melting Range	1400–1450°C	1370–1400°C
Typical Finish	2B / BA / Mirror	2B / BA / No.4 / Mirror
Common Standard	EN 1.4301 / ASTM A240	EN 1.4401 / ASTM A240

 

Price Trend of 316 Stainless Steel

As of Q4 2025, the average stainless steel 316L price per kg ranges between US$3.5–4.5/kg depending on thickness, finish, and order quantity.
Due to its molybdenum addition, 316 stainless steel is typically 10–20% more expensive than 304 or 18/8 stainless steel, but it offers significantly longer service life in aggressive environments, reducing total lifecycle cost.

 

Is 18/8 stainless steel the same as 304?
Yes. 18/8 is the traditional name for 304 stainless steel, referring to its Cr/Ni ratio.

Can I replace 316 with passivated 18/8 in my project?
For indoor or low-corrosion environments-yes.
For marine or chemical exposure-choose 316 for better reliability.

 

Gnee offers a ready supply of passivated 18/8 (304) and 316 stainless steel sheets, coils, and tubes, with complete factory certifications (EN, ASTM, ISO).

Our competitive advantages:
Extensive global export experience: Over 18 years of experience serving more than 60 countries.

Product forms: Sheets, coils, strips, tubes, round bars, and custom cut parts.

Fast delivery: In stock or custom production, delivery within 7-15 days.

Complete specifications: Thickness 0.3-60 mm, finishes 2B / No.4 / Mirror / BA.

Strict quality control: 100% PMI testing, ISO 9001 certified.

Highly competitive pricing: Direct sourcing from factories ensures highly competitive prices per kilogram for 316L stainless steel.

Email: sales@gneestainless.com