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316 Stainless Steel Plate

316 Stainless Steel Plate is primarily designed for environments requiring superior corrosion resistance, especially against chlorides and seawater, due to its molybdenum content. In contrast, 321 stainless steel plate is optimized for high-temperature stability and resistance to intergranular corrosion through titanium stabilization. The selection between the two depends on whether the application priority is corrosion resistance (316) or heat resistance (321).

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316 Stainless Steel Plate

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Product Details

316 Stainless Steel Plate is a molybdenum-bearing austenitic stainless steel widely used in marine, chemical, and high-corrosion environments. It offers excellent resistance to chloride corrosion and is one of the most common high-performance stainless steel grades in the 300 series.

Key Characteristics of 316 Stainless Steel

Excellent resistance to pitting and crevice corrosion
Strong performance in chloride and seawater environments
Good high-temperature strength
Excellent weldability and formability
Stable austenitic structure (non-magnetic in annealed condition)

Chemical Composition (Typical)

Element	Content (%)
Chromium (Cr)	16.0 – 18.0
Nickel (Ni)	10.0 – 14.0
Molybdenum (Mo)	2.0 – 3.0
Carbon (C)	≤ 0.08
Manganese (Mn)	≤ 2.0
Iron (Fe)	Balance

The addition of molybdenum (Mo) is the key factor that significantly improves corrosion resistance compared with 304 stainless steel.

316 vs 321 Stainless Steel Plate

Although both 316 and 321 belong to the 300 series austenitic stainless steels, they are designed for different performance requirements.

Property	316 Stainless Steel	321 Stainless Steel
Stabilizing Element	Molybdenum (Mo)	Titanium (Ti)
Main Advantage	Corrosion resistance (especially chloride resistance)	High-temperature stability
Corrosion Resistance	Excellent (marine & chemical)	Very good
High Temperature Resistance	Good	Excellent
Pitting Resistance	Very strong	Moderate
Intergranular Corrosion Resistance	Good	Excellent (due to Ti stabilization)
Typical Applications	Marine equipment, chemical tanks, coastal structures	Exhaust systems, boilers, heat exchangers

Performance Comparison

1. Corrosion Resistance

316 Stainless Steel performs significantly better in chloride-rich environments such as seawater and chemical processing.
321 Stainless Steel is better suited for environments where intergranular corrosion at high temperatures may occur.

2. Heat Resistance

321 Stainless Steel has better resistance to thermal fatigue and high-temperature exposure due to titanium stabilization.
316 Stainless Steel performs well but is more focused on corrosion resistance rather than extreme heat stability.