Description
Types 310 (UNS S 31000) and 310S (UNS S 31008) are austenitic chromium-nickel
steels with high heat resisting qualities and excellent resistance to corrosion.
They are essentially nonmagnetic when annealed or cold worked.
Product Forms Ingots, Slabs, Hot bands, Sheet, Strip
Typical Applications
Annealing boxes and tubes
Belts for continuous furnaces
Carburizing boxes
Chemical processing equipment
Conveyor parts
Dryers
Furnace parts
Gas turbine and aircraft exhaust
Heat exchangers
Jet engine parts
Oil refinery equipment
Paper mill equipment
Recuperators
Skid rails
Chemical Composition
Carbon
Manganese
Silicon
Chromium
Nickel
T310 0.25 max.
T310S 0.08 max.
2.00
max.
1.50
max.
24.00/
26.00
19.00/
22.00
Typical Material Properties
Finish/
Condition
Yield
Strength
psi
Tensile
Strength
psi
Elongation
in 2 in.,
%
Hardness
Rockwell
B
No. 1/2D Finish,
annealed
45,000
95,000
45
95
Processing
Annealing
Cool rapidly from 1900-2100°F. Air cooling from annealing temperature
may be employed for light sections, otherwise water quenching is necessary.
Hardening
These grades can be hardened only by cold work. See table of Typical
Mechanical Properties.
Stress Relieving
The recommended temperature range for stress relieving is 400-750°F.
Hot Working
Initial forging and pressing temperature-2000-2250°F.
Finishing temperature-1700°F.
Reductions under 1800°F should be light.
Forming
Type 310 can be formed into most desired shapes. However, since it work
hardens, an annealing treatment should precede and follow each severe cold
forming operation.
Physical Properties
Density
lb./cu. in.
Modulus of
Elasticity
in Tension
x 10^6, psi
Specific
Heat
Btu/°F/lb
Thermal
Conductivity
Btu/hr/ft^2/ft/
Mean Coefficient
of Thermal Expansion
per °F(x 10^-6)
Melting
Point
Range
Electrical
Resistivity
microohn-cm
32-212 °F
°F
°F
°F
@ 70 °F
0.29
29.0
0.12
212
932
32-212
32-600
32-1000
32-1200
2550/2650
78
8.2
10.8
8.8
9.0
9.4
9.7
Elevated Temperature Strength
Creep Strength,
load for 1% elong
10,000 hr,psi
Temperature
1000 °F
1100 °F
1200 °F
1300 °F
17,000
13,000
9000
5000
Welding
Type 310 is usually welded by the electric arc or gas fusion process. Type 310, Type 310Cb or Type 310Mo filler metal or electrodes are used.
Corrosion
Because of high alloy content, Types 310 and 310S have excellent overall corrosion resistance to such media as industrial atmosphere, most organic acids and mine waters.
Type 310 has superior corosion resistance in chemical media to Types 302 and 304.
Type 310S (0.08 max. C) is generally used when corrosion resistance in the as-welded condition is important.
Oxidation
In addition to its maximum temperature of 2100°F for continuous service, Type 310 has the highest limiting intermittent temperature of the chromium-nickel grades--1900°F.
