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Stainless Steel 310 (UNS S31000) And 310S (UNS S31008)

DataTime:[2014-10-24]

Stainless Steel 310, 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.

Stainless Steel 310S (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 310.

Key Properties

These properties are specified for product (flange, pipe fittings and pipes) in ASTM A240/A240M. Similar but not necessarily identical properties are specified for other products such as pipe and bar in their respective specifications.

Composition

Typical compositional ranges for grade 310 stainless steels are given in table 1.

Table 1. Composition ranges for 310 grade stainless steel

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

-

Mechanical Properties

Typical mechanical properties for grade 310 stainless steels are given in table 2.

Table 2. Mechanical properties of 310 grade stainless steel

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

310

515

205

40

95

217

310S

515

205

40

95

217

Physical Properties

Typical physical properties for annealed grade 310 stainless steels are given in table 3.

Table 3. Physical properties of 310 grade stainless steel in the annealed condition

Grade

Density (kg/m3)

Elastic Modulus (GPa)

Mean Coefficient of Thermal Expansion (μm/m/°C)

Thermal Conductivity(W/m.K)

Specific Heat 0-100°C (J/kg.K)

Electrical Resistivity (nΩ.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

Grade Specification Comparison

Approximate grade comparisons for 310 stainless steels are given in table 4.

Table 4. Grade specifications for 310 grade stainless steel

Grade

UNS No

Old 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

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.


Welding

Good characteristics suited to all standard methods. Stainless Steel 310S electrodes generally recommended for fusion welding. AS 1554.6 pre-qualifies welding of 310 with Grade 310 rods or electrodes.

“Dual Certification”

Stainless Steel 310 and Stainless Steel 310S are sometimes stocked in "Dual Certified" form - mainly in Stainless Steel 310 Tube and Stainless Steel 310S Pipe. These items have chemical and mechanical properties complying with both 310 and 310S specifications.

Applications

Typical applications include:

         Furnace parts

         Oil burner parts

         Carburising boxes

         Heat Treatment baskets and jigs

         Heat Exchangers

         Welding filler wire and electrodes

 

Source: Yaang Pipe Industry

For more information on this source please visit: Yaang Pipe Industry .

Tel No:+86-18267732328 / Email:[email protected]
Address:Longwan District, Wenzhou, Zhejiang Province, China.

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