SUS310, sus310s

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Description

Stainless Steel 310, SUS310, SUS310S, UNS S31008, 1.4840, 1.4845

uns s31008 Chemical composition

Fe, <0.25% C, 24-26% Cr, 19-22% Ni, <2% Mn, <1.5% Si, <0.45% P, <0.3% S

What is 310 grade stainless steel?
ss 310 is a medium carbon austenitic stainless steel, for high temperature applications such as furnace parts and heat treatment equipment. It is used at temperatures up to 1150°C in continuous service, and 1035°C in intermittent service.

SuS310, 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.

SUS310S (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 SUS310.

Like other austenitic grades these have excellent toughness, even down to cryogenic temperatures, although other grades are normally used in this environment.

Chemcial Composition of Grade 310/310S Stainless Steel

Grade C Mn Si P S Cr Mo Ni N
SS310 min.

max.

0.25

2.00

1.50

0.045

0.030

24.0

26.0

19.0

22.0

SS310S min.

max.

0.08

2.00

1.50

0.045

0.030

24.0

26.0

19.0

22.0

 Mechanical PropertiesTypical mechanical properties for SUS310 stainless steels

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
SS 310 515 205 40 95 217
SS 310S 515 205 40 95 217

Comparison  grade  difference between 310 and 310S

Grade UNS No Old British Euronorm Swedish SS Japanese JIS
BS En No Name
SS310 S31000 310S24 1.4840 X15CrNi25-20 SUH 310
SS310S 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.

Alternative grades to aisi 310 stainless steels are given .

Grade Why it might be chosen instead of SS310
3CR12 Heat resistance is needed, but only to about 600°C.
SS304H Heat resistance is needed, but only to about 800°C.
SS321 Heat resistance is needed, but only to about 900°C. Subsequent aqueous corrosion resistance also required.
253MA (2111HTR) A slightly higher temperature resistance is needed than can be provided by 310. Better resistance to reducing sulphide atmosphere needed. Higher immunity from sigma phase embrittlement is required.
What is the difference between 310 and 310S?
Type 310S Stainless Steel is identical to Type 310 except for a lower carbon content that minimizes carbide precipitation and improves weldability. They are essentially nonmagnetic as annealed and become lightly magnetic when cold worked.
What is the difference between 304 and 310 stainless steel?
1) Composition: 310 type has a higher chromium content (24-26%) vs 304 (10-20%), and nickel content(19-22%) vs 304 (8-10.5%). 2) 304 steel is going to be pretty ductile, and 310 is a bit harder. 3) Stainless steel 310 has greater hardenability, wear and corrosion resistance than 304.
What is 310 welding rod used for?
Tech-Rod® 310 electrodes are used for welding stainless steels of similar composition in cast and wrought forms. The weld deposit is fully austenitic, and as such, calls for minimal heat input during welding.

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 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, if subsequent aqueous corrosion resistance is needed, but often performs well in temperatures fluctuating above and below this range.

SUS310 is generally used at temperatures starting from about 800 or 900°C – above the temperatures at which SS304H and SS321 are effective.

Heat TreatmentSolution Treatment (Annealing) – heat to 1040-1150°C and cool rapidly for maximum corrosion resistance. This treatment is also recommended to restore ductility after each 1000 hours of service above 650°C, due to long term precipitation of brittle sigma phase.

 

Applications include:

  • Furnace parts
  • Oil burner parts
  • Carburising boxes
  • Heat Treatment baskets and jigs
  • Heat Exchangers
  • Welding filler wire and electrodes