Alloy 310 310S austenitic stainless steel is typically used for elevated temperature applications. Its high chromium and nickel content provides comparable corrosion resistance, superior resistance to oxidation, and the retention of a larger fraction of room temperature strength than the common austenitic Alloy 304. Stainless Steel 310/310S is an austenitic heat resisting alloy with excellent resistance to oxidation under mildly cyclic conditions to 2100ºF. Its high chromium and nickel contents provide comparable corrosion resistance, superior resistance to oxdation and the retention of a larger fraction of roomtemperature strength.

310 is a highly alloyed austenitic stainless steel used for high temperature application. The high chromium and nickel content give the steel excellent oxidation resistance as well as high strength at high temperature. This grade is also very ductile, and has good weldability enabling its widespread usage in many applications. 

Typical Applications Grade 310/310S is used in fluidised bed combustors, kilns, radiant tubes, tube hangers for petroleum refining and steam boilers, coal gasifier internal components, lead pots, thermowells, refractory anchor bolts, burners and combustion chambers, retorts, muffles, annealing covers, saggers, food processing equipment, cryogenic structures. 

310 Stainless Steel, combining excellent high temperature properties with good weldability and ductility, is designed for high temperature service. 310 resists oxidation in continuous service at temperatures up 1150°C provided reducing sulfur gases are not present. 310 is also used for intermittent service at temperatures up to 1040°C.
310 /310S Technical Data: 310S is the low carbon version of SX 310 and is s ested for applications where sensitisation, and subsequent corrosion by high temperature gases or condensates during shutdown may pose a  problem. SX 310 is manufactured in accordance with ASTM A 167 and SX 310S 
Typical Applications:310/310S find wide application in all high-temperature environments where scaling and corrosion resistance, as well as high temperature strength and good creep resistance, are required
Chemical Composition
    C    Mn    P    S    Si    Cr    Ni    Mo
310    0.25 max    2.0 max    0.045 max    0.030 max    1.0 max    24.0 - 26.0    19.0 - 22.0    
310S    0.08 max    2.0 max    0.045 max    0.030 max    1.0 max    24.0 - 26.0    19.0 - 22.0    0.75
310H    0.04-0.10     2.0 max    0.045 max    0.030 max    1.0 max    24.0 - 26.0    19.0 - 22.0    --
Typical Properties in the Annealed Condition
The properties quoted in this publication are typical of mill production and unless indicated should not be regarded as guaranteed minimum values for specification purposes.
1. Mechanical Properties at Room Temperature
      310    310S
     Typical     Minimum    Typical     Minimum
Tensile Strength, MPa
625    515    575    515
Yield Stress (0.2 % offset), MPa    350    205    290    205
Elongation (Percent in 50mm)    50    40    50    40
Hardness (Brinell)    172    -    156    -
Endurance (fatigue) limit, MPa    260    -    260    -
2. Properties at Elevated Temperatures 
The values quoted are those for 310. 
Enquire for data on 310S .
Short Time Elevated Temperature Tensile Strength
Temperature, oC    550    650    750    850    950    1050
Tensile Strength, MPa    550    430    280    180    90    50
Creep data 
Stress to develop a creep rate of 1% in the indicated time at the indicated temperature.
Time    TemperatureoC    550    600    650    700    750    800
10 000 h    Stress MPa    110    90    70    40    30    15
100 000 h    Stress MPa    90    75    50    30    20    10
Creep Rupture Stress
Time    Temperature oC    600    700    800    900    1000
1 000 h    Stress MPa    190    110    50    35    15
10 000 h    Stress MPa    170    70    35    20    10
100 000 h    Stress MPa    110    55    25    10    2
Recommended Maximum Service Temperature 
(Oxidising Conditions) 
Continuous 1150oC 
Intermittent 1035oC
Thermal Processing 
1 Annealing Heat from 1050 to 1150oC and water quench This treatment ensures that all carbides are in
Physical Properties of 310S/310H Alloys in the Annealed Condition
        Tensile Strength
Yield Strength
                    
Alloy    UNS    psi    MPa    ksi    psi    MPa    ksi    Elongation in 2 inches (min.) %    Grain Size Req.    Maximum Hardness    Modulus of Elasticity (x106 psi)    Mean Coefficient of Thermal Expansion (IN./IN./°F x 10-6)    Thermal Conductivity
(BTU-in/ft2-h-°F)
310S    S31008    75,000    515    75    30,000    205    30    35    —    90 Rb    29.0    9.2    116
310H    S31009    75,000    515    75    30,000    205    30    35    6 or coarser    90 Rb    29.0    9.2    116

Composition of 310S/310H stainless steel pipe
Grade    310S    310H
UNS Designation    S31008    S31009
Carbon (C) Max.    0.08    0.04– 0.10
Manganese (Mn) Max.    2.00    2.00
Phosphorous (P) Max.    0.045    0.045
Sulphur (S) Max.    0.030    0.030
Silicon (Si) Max.    1.00    1.00
Chromium (Cr)    24.0–26.0    24.0–26.0
Nickel (Ni)    19.0–22.0    19.0–22.0
Molybdenum (Mo)    —    —
Nitrogen (N)    —    —
Iron (Fe)    Bal.    Bal.
Other Elements    —    —

310S/310H Product Range
Alloy    UNS Designation    Werkstoff NR.
310S    S31008    1.4845
310H    S31009    —
*Note: The specifications noted including ASTM, ASME, or other applicable authorities are correct at the time of publication. Other specifications may apply for use of these materials in different applications.
Principal Design Features  The strength of this alloy is a combination of good strength and corrosion resistance in temperatures up to 2100oF (1149oC). Due to its relatively high chromium and nickel content it is superior in most environments to 304 or 309 stainless. 
Applications  Oven linings, boiler baffles, kilns, lead pots, radiant tubes, annealing covers, saggers, burners, combustion tubes, refractory anchor bolts, fire box sheets, furnace components and other high temperature containers. 
Machinability  This alloy machines similarly to type 304 stainless. Its chips are stringy and it will work harden rapidly. It is necessary to keep the tool cutting at all times and use chip breakers. 
Welding  Most of the austenitic stainless steels can be readily welded using fusion or resistance methods. Oxyacetylene welding is not recommended. Filler metal should be AWS E/ER 310. 
Hot Working  Most common hot work methods can be successfully performed after uniform heating to 2150 F (1177 C). Do not forge below 1800 F (982 C). Rapid cooling is required to maximize corrosion resistance. 
Cold Working  Although this alloy has a high work hardening rate, it can be drawn, headed, upset, and stamped. Full annealing is required after cold work to remove internal stress. 

Annealing  1900-2050 F (1038-1121 C) water quench. 
Principal Design Features  The strength of this alloy is a combination of good strength and corrosion resistance in temperatures up to 2100 F (1149 C). Due to its relatively high chromium and nickel content it is superior in most environments to 304 or 309 stainless. 
Hardening  This alloy does not respond to heat treatment. Cold work will cause an increase in both hardness and strength.

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