Page 67 of 561

SOLUTIONS: Stainless Steel Austenitic Stainless Steel The highest tonnage of weldable stainless steel produced are of the austenitic grades. These are the chromium nickel steel of the AISI 200 and 300 series in which chromium usually exceeds 17% and nickel AISI Type

2.06

with a few exceptions exceeds 7%. Austenitic grades are non-magnetic. Autenitic stainless steel has the highest corrosion resistance of all the stainless steel. Most materials for chemical carriers are selected from this group of materials, and AISI 316 L is the most commonly used.

Composition % *

Carbon Chromium C Cr

Nickel Ni

Other

301 302 302 B 303

303 Se

304 304 L 305 308

0,15 0,15 0.15 0,15 0,15 0,08 0,03 0,12 0,08

16,0 – 18,0 17,0 – 19,0 17,0 – 19,0 17,0 – 19,0 17,0 – 19,0 18,0 – 20,0 18,0 – 20,0 17,0 – 19,0 19,0 – 21,0

6,0 - 8,0 8,0 – 10,0 8,0 – 10,0 8,0 – 10,0 8,0 – 10,0 8,0 - 12,0 8,0 – 12,0 10,0 – 13,0 10,0 – 12,0

2,0 – 3,0 Si –

2,0 – 3,0 Si

0,20 P 0,15 S (min) 0,60 Mo (opt) 0,20 P 0,06 S (min) 0,15 Se (min) – – – –

309 309 S

0,20 0,08

22,0 – 24,0 22,0 – 24,0

12,0 – 15,0 12,0 – 15,0

– –

310 310 S 314

0,25 0,08 0,25

24,0 – 26,0 24,0 – 26,0 23,0 – 26,0

19,0 –22,0 19,0 –22,0 19,0 – 22,0

1,5 Si 1,5 Si 1,5 – 3,0 Si

316 316 L 316 N

0,08 0,03 0,08

16,0 – 18,0 16,0 – 18,0 16,0 – 18,0

10 – 14,0 10 – 14,0 10,0 – 14,0

2,0 – 3,0 Mo

2,0 – 3,0 Mo

1,0Si 2,0Mn 2,0-3,0Mo 0,10-0,16Ni

May be welded with (E) Electrode (W) Wire Welding (T) Tig 18/8-321N (E) S-316-M-GF-221 (W) 18/8 Mo-221 (T)

23/14-322N (E) S-309-M-GF-222 (W) IMPACT-329S (E) 18/8-321N (E) S-316-M-GF-221 (W) 18/8 Mo-221 (T) 317 0,08 18,0 – 20,0 11,0 – 15,0 317 L 0,03 18,0 – 20,0 11,0 – 15,0 321 0,08 17,0 – 19,0 9,0 – 12,0 329 0,10 25,0 – 30,0 3,0 – 6,0 330 0,08 17,0 – 20,0 34,0 – 37,0 347 0,08 17,0 – 19,0 9,0 – 13,0 347 M 0,03 19,0 10,0 348 0,08 17,0 – 19,0 9,0 – 13,0

3,0 – 4,0 Mo 3,0 – 4,0 Mo Ti (5x%C min) 1,0 – 2,0 Mo 0,75-1,5 Si 0,04 P Cb + Ta (10x %C min)

Cb 13 x Cmax 0,65

Cb+Ta (10x%C min but 0,10 Ta max 0,20 Co)

23/14-322N (E) S-309-M-GF-222 (W)

* Single values denote maximum percentage unless otherwise stated Unless otherwise stated, other elements of all alloys listed include maximum contents of 2,0 % Mn, 1,0 % Si, 0,045 P and 0,03 % S. Balance Fe.

66