316L Cold-Rolled Stainless Steel Sheet

Comparison Items:

316L Cold-Rolled Sheet

316L Hot Rolled Steel Sheet

Rolling Condition

Rolled at room temperature, resulting in work hardening

High-temperature rolling, resulting in full recrystallization of grains

Tensile / Yield Strength

Higher strength due to cold working

Slightly lower strength, closer to the material standard value

Surface Hardness

Higher hardness, resulting in a harder sheet surface

Lower hardness, softer texture

Plasticity (Elongation)

Relatively weak, with average ductility

Excellent tensile and deformation capacity

Impact Toughness

Slightly poor, with average impact and vibration resistance

Better performance, more stable under impact and alternating loads

Grain Structure

Elongated and oriented grains

Round and uniform grains, stable microstructure

Residual Stress

Existing residual stress from cold working

Sufficient stress release, minimal residual stress

High-Angle Bending

Prone to cracking, unsuitable for severe deformation

Not prone to cracking, suitable for heavy bending and forming

Comparison Items

316L Cold-Rolled Stainless Steel Sheet

316L Hot-Rolled Stainless Steel Sheet

Core Material and Basic Corrosion Resistance

The chemical composition fully complies with the 316L grade standard. There is no fundamental difference in basic corrosion resistance properties such as acid and alkali resistance, chloride ion resistance, and intergranular corrosion resistance.

Same as above, chemical composition and grade standard are completely matched, and the corrosion resistance of the base material is no different from that of cold-rolled sheet.

Surface Condition and Localized Corrosion Resistance

Mostly 2B/BA/brushed finishes, with a smooth, dense, and highly polished surface, making it less prone to accumulating corrosive media and exhibiting superior resistance to pitting and crevice corrosion.

Mostly No.1 pickled/sandblasted surface, rough surface with fine texture, easy to adhere to impurities and chloride ions, more prone to local rust spots, and weaker resistance to localized corrosion.

Surface Quality and Oxide Layer Influence

Room-temperature rolling eliminates high-temperature oxide scale, resulting in a clean finished surface free of surface inclusions and oxide layer residue, ensuring stable corrosion resistance.

Although pickled after high-temperature rolling, trace amounts of oxide layer and surface inclusions may still remain. These weak points will slightly reduce local corrosion resistance.

Processing Residual Stress and Corrosion Resistance Stability

Slight residual cold working stress exists, but its impact on corrosion resistance is minimal under normal operating conditions, only having a slight effect under extreme stress corrosion environments.

High-temperature rolling fully releases stress, with minimal residual stress, lower risk of stress corrosion, and better corrosion stability.

Corrosion Resistance in Welded Heat-Affected Zone

The weld heat-affected zone is small, and cold working stress is released during welding, resulting in a small decrease in corrosion resistance after welding.

The weld heat-affected zone is larger, and high temperature will temporarily change the local metallographic structure. If no post-weld treatment is performed, the corrosion resistance of the heat-affected zone will slightly decrease.

Corrosion Resistance Adaptability under Typical Working Conditions

More suitable for outdoor coastal humid environments, exterior parts, thin plates, and mildly corrosive conditions, maximizing surface advantages.

More suitable for chemical storage tanks, pressure vessels, thick plate structures, and overall immersion corrosion conditions, the corrosion resistance of the base material can be fully utilized, and the cost is more favorable.

Long-Term Performance under the Same Environment

In humid, high-salt-spray environments, the probability of rust spots is lower with long-term use, and appearance retention is better.

In dry environments without strong corrosive media, long-term corrosion resistance is basically the same as that of cold-rolled sheet, only the appearance smoothness deteriorates faster.