sus310 vs sus310s: high temperature resistance

SUS310 vs SUS310S: High-Temperature Resistance

SUS310 and SUS310S (equivalent to ASTM 310 and 310S) are high-chromium-nickel austenitic stainless steels renowned for their exceptional high-temperature oxidation resistance. Below is a technical comparison of their high-temperature performance:

 

SUS310 vs SUS310S: Chemical Composition

Element	SUS310	SUS310S
Carbon (C)	≤0.25%	≤0.08%
Chromium (Cr)	24-26%	24-26%
Nickel (Ni)	19-22%	19-22%

 

SUS310 vs SUS310S: Maximum Service Temperature

Condition	SUS310	SUS310S
Continuous Service	≤1,150°C	≤1,200°C
Intermittent Service	≤1,035°C	≤1,150°C

Conclusion: SUS310S offers superior oxidation resistance in prolonged high-temperature environments, with a 50°C higher continuous service temperature than SUS310.

 

SUS310 vs SUS310S: High-Temperature Mechanical Properties

Property	SUS310	SUS310S
Creep Strength (1,000°C)	20 MPa	15–18 MPa
Short-Term High-Temperature Strength	Higher	Slightly Lower

 

SUS310 vs SUS310S: Analysis:

SUS310 exhibits slightly higher strength at elevated temperatures due to its higher carbon content.

SUS310S's lower strength makes it ideal for stress-free or low-stress high-temperature applications (e.g., oxidation-resistant components).

 

SUS310 vs SUS310S: Applications

Scenario	Recommended Alloy	Reason
Furnace Tubes/Radiant Tubes	SUS310S	Superior long-term oxidation resistance
High-Temperature Fixtures/Supports	SUS310	Balances strength and oxidation resistance
Sulfur-Containing Environments	SUS310S	Reduced carbide precipitation for sulfidation resistance

 

SUS310 vs SUS310S: Heat Treatment and Welding

SUS310: Requires post-weld solution annealing (1,040–1,065°C water quenching) to restore corrosion resistance.

SUS310S: Better weldability with lower thermal cracking risk due to low carbon content, but use matching filler metal (e.g., ER310).