321 321H Stainless Steel

Grade

C

Mn

Si

P

S

Cr

Mo

Ni

N

Other

321

min.
max

-
0.08

2.00

0.75

0.045

0.030

17.0
19.0

-

9.0
12.0

0.10

Ti=5(C+N)
0.70

321H

min.
max

0.04
0.10

2.00

0.75

0.045

0.030

17.0
19.0

-

9.0
12.0

-

Ti=4(C+N)
0.70

347

min.
max

0.08

2.00

0.75

0.045

0.030

17.0
19.0

-

9.0
13.0

-

Nb=10(C+N)
1.0

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

321

515

205

40

95

217

321H

515

205

40

95

217

347

515

205

40

92

201

321H also has a requirement for a grain size of ASTM No 7 or coarser.

Grade

Density (kg/m3)

Elastic Modulus (GPa)

Mean Coefficient of Thermal Expansion (m/m/0C)

Thermal Conductivity (W/m.K)

Specific Heat 0-1000C (J/kg.K)

Electrical Resistivity (n.m)

0-1000C

0-3150C

0-5380C

at 1000C

at 5000C

321

8027

193

16.6

17.2

18.6

16.1

22.2

500

720

Grade

UNS No

Old British

Euronorm

Swedish SS

Japanese JIS

BS

En

No

Name

321

S32100

321S31

58B, 58C

1.4541

X6CrNiTi18-10

2337

SUS 321

321H

S32109

321S51

-

1.4878

X10CrNiTi18-10

-

SUS 321H

347

S34700

347S31

58G

1.4550

X6CrNiNb18-10

2338

SUS 347

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.