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Introduction of stainless steel SUS 321
Jan 17, 2019

1. Summary

     Adding a carbon stabilizing element Ti to the 304 steel grade inhibits grain boundary sensitization and can be used in the sensitization zone (450~8500C).



2, characteristics

1) Excellent resistance to grain boundary corrosion;

2) parts that cannot be heat treated after welding;

3) Excellent welding performance and good processing performance.

3. Scope of application

Heat exchangers, pipes, expansion joints, aerospace equipment, exhaust pipes, boiler components, parts/equipment that cannot be heat treated after assembly.

3. Chemical composition (JIS G 4305-2005)

(wt%)

chemical composition

C

Si

Mn

P

S

Cr

Ni

Ti

standard

£0.08

£1.0

£2.0

£0.045

£0.030

17.0~19.0

9.0~13.0

≥ 5XC%

general

0.04

0.50

1.3

0.026

0.001

17.70

9.10

0.30



4. Performance (JIS G 4305-2005)

distinguish

Mechanical properties

Ys (Mpa)

Ts (Mpa)

El (%)

Hv

standard

≥ 205

≥ 520

≥ 40

≤ 200

general

270

610

51

155



5, physical properties

density

(g/cm3)

magnetic

Specific heat

(J/g.0C)

Thermal conductivity

1000C(W/m. 0C)

Thermal expansion rate

20~1000C

(10-6/0C)

7.93

no


0.5

16.1

16.7


6, heat treatment

melt

Point: 1400~14250C;

Solution treatment: 920~11500C.

7, the state of use

1) Annealing solution state:

      NO.1, 2D, 2B, and various other surface treatment states


2) Rolling hard state.

8, matters needing attention

- Magnetic phenomenon occurs after processing;

- Due to the addition of Ti, the surface color is not as good as 304

strip014

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