Alloy 310/310S/310H
(UNS S31000, S31008, S31009) W. Nr. 1.4845
Size Range:
Thickness:0.3-280mm Width:≤2500mm Length:≤12000mm
Alloy 310 (UNS S31000) is an austenitic stainless steel developed for use in high temperature corrosion resistant applications. The alloy resists oxidation up to 2010°F (1100°C) under mildly cyclic conditions.
Because of its high chromium and moderate nickel content, Alloy 310 is resistant to sulfidation and can also be used in moderately carburizing atmospheres. The more severe carburizing atmospheres of thermal process equipment usually require nickel alloys such as 330 (UNS N08330). Alloy 310 can be utilized in slightly oxidizing, nitriding, cementing and thermal cycling applications, albeit, the maximum service temperature must be reduced. Alloy 310 also finds usage in cryogenic applications with low magnetic permeability and toughness down to -450°F (-268°C).
Applications
Chemical Analysis
Element | 310 | 310S | 310H |
Chromium | 24.0 min. –26.0 max | 24.0 min. –26.0 max | 24.0 min. –26.0 max |
Nickel | 19.0 min. –22.0 max. | 19.0 min. –22.0 max. | 19.0 min. –22.0 max. |
Carbon | 0.25 | 0.08 | 0.04 min. –0.10 max. |
Manganese | 2 | 2 | 2 |
Phosphorus | 0.045 | 0.045 | 0.045 |
Sulfur | 0.03 | 0.03 | 0.03 |
Silicon | 1.5 | 1.5 | 0.75 |
Iron | Balance | Balance | Balance |
Physical Properties
Density |
0.285 Ibs/in3
7.89 g/cm3
|
Electrical Resistivity |
30.7 Microhm-in at 68°F
78.0 Microhm-cm at 20°C
|
Melting Range |
2470–2555°F
1354–1402°C
|
Specific Heat |
0.12 BTU/lb-°F (32–212°F)
502 J/kg-°K (0–100°C)
|
Modulus of Elasticity |
28.5 x 106 psi
196 Gpa
|
Thermal Conductivity |
8.0 BTU/hr/ft2/ft/°F
10.8 W/m-°K
|
Mechanical Properties
Yield Strength
0.2% Offset
|
Ultimate Tensile
Strength
|
Elongation
in 2 in
|
Hardness | ||
psi(min) | (Mpa) | psi(min.) | (Mpa) | %(min.) | (max.) |
35,000 | 245 | 80,000 | 550 | 45 | 217 Brinell |
Corrosion Resistance
Wet Corrosion
Alloy 310 is not designed for service in wet corrosive environments. The high carbon content, which is present to enhance creep properties, has a detrimental effect on aqueous corrosion resistance. The alloy is prone to intergranular corrosion after long term exposure at high temperatures.
However, due to its high chromium content (25%), Alloy 310 is more corrosion resistant than most heat resistant alloys.
High Temperature Corrosion
The high chromium (25%) and silicon (0.6%) content of Alloy 310 make it
more resistant to high temperature corrosion in most in-service environments.
Operating temperatures are listed below.
Creep Properties
The alloy does not perform as well as Alloy 600 (UNS N06600) or Alloy 800 (UNS N08800) in reducing, nitriding or carburizing atmospheres, but it does
outperform most heat resistant stainless steels in these conditions.
Temperature | Creep Strain (Mpa) | Creep Rupture (Mpa) | |||||
℃ | ℉ | 1000H | 1000H | 10000H | 1000H | 1000H | 10000H |
600 | 1112 | 120 | 100 | 40 | 200 | 140 | 80 |
700 | 1292 | 50 | 35 | 20 | 80 | 45 | 20 |
800 | 1472 | 20 | 10 | 8 | 35 | 20 | 8 |
900 | 1652 | 10 | 6 | 3 | 15 | 10 | 5 |
1000 | 1832 | 5 | 3 | 1.5 | 9 | 4 | 2 |