Stainless Steel 310, combining excellent high temperature properties with good ductility and weldability, is designed for high temperature service. It resists oxidation in continuous service at temperatures up to 1150°C provided reducing sulphur gases are not present. It is also used for intermittent service at temperatures up to 1040°C.
Stainless Steel 310S (UNS S31008) is used when the application environment involves moist corrodents in a temperature range lower than that which is normally considered “high temperature” service. The lower carbon content of 310S does reduce its high temperature strength compared to 310.
Key Properties
These properties are specified for product (flange, pipe fittings and pipes) in ASTM A240/A240M. Similar but not necessarily identical properties are specified for other products such as pipe and bar in their respective specifications.
Composition
Typical compositional ranges for grade 310 stainless steels are given in table 1.
Table 1. Composition ranges for 310 grade stainless steel
Grade
C
Mn
Si
P
S
Cr
Mo
Ni
N
310
min.
max.
–
0.25
–
2.00
–
1.50
–
0.045
–
0.030
24.0
26.0
–
19.0
22.0
–
310S
min.
max.
–
0.08
–
2.00
–
1.50
–
0.045
–
0.030
24.0
26.0
–
19.0
22.0
–
Mechanical Properties
Typical mechanical properties for grade 310 stainless steels are given in table 2.
Table 2. Mechanical properties of 310 grade stainless steel
Grade
Tensile Strength (MPa) min
Yield Strength 0.2% Proof (MPa) min
Elongation (% in 50mm) min
Hardness
Rockwell B (HR B) max
Brinell (HB) max
310
515
205
40
95
217
310S
515
205
40
95
217
Physical Properties
Typical physical properties for annealed grade 310 stainless steels are given in table 3.
Table 3. Physical properties of 310 grade stainless steel in the annealed condition
Grade
Density (kg/m3)
Elastic Modulus (GPa)
Mean Coefficient of Thermal Expansion (μm/m/°C)
Thermal Conductivity(W/m.K)
Specific Heat 0-100°C (J/kg.K)
Electrical Resistivity (nΩ.m)
0-100°C
0-315°C
0-538°C
at 100°C
at 500°C
310/S
7750
200
15.9
16.2
17.0
14.2
18.7
500
720
Grade Specification Comparison
Approximate grade comparisons for 310 stainless steels are given in table 4.
Table 4. Grade specifications for 310 grade stainless steel
Grade
UNS No
Old British
Euronorm
Swedish SS
Japanese JIS
BS
En
No
Name
310
S31000
310S24
–
1.4840
X15CrNi25-20
–
SUH 310
310S
S31008
310S16
–
1.4845
X8CrNi25-21
2361
SUS 310S
These comparisons are approximate only. The list is intended as a comparison of functionally similar materials not as a schedule of contractual equivalents. If exact equivalents are needed original specifications must be consulted.
Welding
Good characteristics suited to all standard methods. Stainless Steel 310S electrodes generally recommended for fusion welding. AS 1554.6 pre-qualifies welding of 310 with Grade 310 rods or electrodes.
“Dual Certification”
Stainless Steel 310 and Stainless Steel 310S are sometimes stocked in “Dual Certified” form – mainly in Stainless Steel 310 Tube and Stainless Steel 310S Pipe. These items have chemical and mechanical properties complying with both 310 and 310S specifications.
Applications
Typical applications include:
• Furnace parts
• Oil burner parts
• Carburising boxes
• Heat Treatment baskets and jigs
• Heat Exchangers
• Welding filler wire and electrodes
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