AISI 310/310S – 1.4810/1.4845
DEFINITION: Grade 310 is designed for high temperature service. Despite that it combines excellent high temperature properties with good ductility and weldability. It resists oxidation in continuous service at temperatures up to 1150°C
. It is also used for intermittent service at temperatures up to 1040°C. Like other austenitic grades these have excellent toughness.
Grade 310S is used when the application environment involves moist corrodents and in dry environments. The lower carbon content of 310S does reduce its high temperature strength compared to 310.
CHEMICAL COMPOSITION:
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 |
- |
CORROSION RESISTANCE:
The high chromium (Cr) content - intended to increase high temperature properties - also gives these grades good aqueous corrosion resistance. Excellent resistance at normal temperatures, and when in high temperature service exhibits good resistance to oxidizing and carburizing atmospheres.
Resists fuming nitric acid at room temperature and fused nitrates up to 425°C. Subject to stress corrosion cracking but more resistant than Grades 304 or 316.
HEAT RESISTANCE:
Good resistance to oxidation in intermittent service in air at temperatures up to 1040°C and 1150°C in continuous service. Good resistance to continuous heat at 1150°C. Good resistance to thermal fatigue and cyclic heating. Widely used where sulphur dioxide gas is encountered at elevated temperatures.
Continuous use in 425-860°C range not recommended due to carbide precipitation.
HEAT TREATMENT: Annealing heat to 1040-1150°C and cool rapidly for maximum corrosion resistance. This heat treatment is also recommended to restore ductility after each 1000 hours of service above 650°C. Cannot be hardened through thermal treatment.
WELDING:
Good characteristics suited to all standard methods. Grade 310S electrodes and wires generally recommended for fusion welding. Welding of 310 with Grade 310 rods or electrodes and through fusion of the same is advised.
MECHANICAL PROPERTIES:
Grade |
Tensile Strength (MPa) min |
Yield Strength 0.2% Proof (MPa) min |
Elongation (% in 50 mm) min |
Hardness |
Rockwell B (HR B) max |
Brinell (HB)
max |
310 |
515 |
205 |
40 |
95 |
217 |
310S |
515 |
205 |
40 |
95 |
217 |
PHYSICAL PROPERTIES:
Quality |
Density (kg/m3) |
Elastic Modulus (GPa) |
Mean Coefficient of Thermal Expansion (mm/m/°C) |
Thermal Conductivity (W/m.K) |
Specific Heat 0-100°C (J/kg.K) |
Electric Resistivity (nW.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 |
OTHER COUNTRY NORMS:
Quality |
UNS No |
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 |
APPLICATIONS:
- Furnace parts
- Oil burner parts
- Carburizing boxes
- Heat treatment baskets
- Heat Exchangers
- Welding filler wire and electrodes
|
