Stainless steel pipe grade and chemical composition

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300 Series—Austenitic Chromium-Nickel Alloys

Type 301 Highly ductile, for formed products. Also hardens rapidly during mechanical working. Good weldability. Better wear resistance and fatigue strength than 304.
Type 302 Same corrosion resistance as 304, with slightly higher strength due to additional carbon.
Type 303 Easier machining version of 304 via addition of sulfur and phosphorus. Also referred to as "A1" in accordance with International Organization for Standardization ISO 3506
Type 304 The most common grade; the classic 18/8 stainless steel. Also referred to as "A2" in accordance with International Organization for Standardization ISO 3506.
Type 309 Better temperature resistance than 304
Type 316 The second most common grade (after 304); for food and surgical stainless steel uses; Alloy addition of molybdenum prevents specific forms of corrosion.
Type 321 Similar to 304 but lower risk of weld decay due to addition of titanium. See also 347 with addition of niobium for desensitization during welding.

400 Series—Ferritic and Martensitic Chromium Alloys

Type 408 heat-resistant; poor corrosion resistance; 11% Chromium, 8% Nickel.
Type 409 cheapest type; used for automobile exhausts; ferritic (iron/chromium only).
Type 410 martensitic (high-strength iron/chromium). Wear resistant, but less corrosion resistant.
Type 416 easy to machine due to additional sulfur
Type 420 "Cutlery Grade" martensitic; similar to the Brearley's original "rustless steel". Also known as "surgical steel". Excellent polishability.
Type 430 decorative, e.g., for automotive trim; ferritic. Good formability, but with reduced temperature and corrosion resistance.
Type 440 a higher grade of cutlery steel, with more carbon in it, which allows for much better edge retention when the steel is heat treated properly.

Stainless Steel Grades Chemical Composition

Grade Mark Chemical Compositions(%)
C Cr Ni Mn P S Mo Si Cu N Others
201 1Cr17Mn
6Ni5N
≤0.15 16.00-
18.00
3.50-
5.50
5.50-
7.50
≤0.060 ≤0.03 - ≤1.00 - ≤0.25 -
201L 03Cr17Mn
6Ni5N
≤0.03 16.00-
18.00
3.50-
5.50
5.50-
7.50
≤0.060 ≤0.03   ≤1.00   ≤0.25  
202 1Cr18Mn
8Ni5N
≤0.15 17.00-
19.00
4.00-
6.00
7.50-
10.00
≤0.060 ≤0.03   ≤1.00 - ≤0.25 -
204 03Cr16Mn
8Ni2N
≤0.03 15.00-
17.00
1.50-
3.50
7.00-
9.00
          0.15-
0.30
 
China 1Cr18Mn10Ni
5Mo3N
≤0.10 17.00-
19.00
4.00-
6.00
8.50-
12.00
    2.8-
3.5
    0.20-
0.30
 
Russia 2Cr13Mn
9Ni4
0.15-
0.25
12.00-
14.00
3.70-
5.00
8.00-
10.00
             
China 2Cr15Mn
15Ni2N
0.15-
0.25
14.00-
16.00
1.50-
3.00
14.00-
16.00
          0.15-
0.30
 
  1Cr18Mn
10Ni5Mo3N
≤0.15 17.00-
19.00
4.00-
6.00
8.50-
12.00
≤0.060 ≤0.03 2.8-
3.5
≤1.00 - 0.20-
0.30
-
301 1Cr17Ni7 ≤0.15 16.00-
18.00
6.00-
8.00
≤2.00 ≤0.065 ≤0.03 - ≤1.00 - - -
302 1Cr18Ni9 ≤0.15 17.00-
19.00
8.00-
10.00
≤2.00 ≤0.035 ≤0.03 - ≤1.00 - - -
303 Y1Cr18Ni9 ≤0.15 17.00-
19.00
8.00-
10.00
≤2.00 ≤0.20 ≤0.03 1) ≤1.00 - - -
303se Y1Cr18Ni
9Se
≤0.15 17.00-
19.00
8.00-
10.00
≤2.00 ≤0.20 ≤0.03 - ≤1.00 - - Se≥0.15
304 0Cr18Ni9 ≤0.07 17.00-
19.00
8.00-
10.00
≤2.00 ≤0.035 ≤0.03 - ≤1.00 - - -
304L 00Cr19Ni10 ≤0.03 18.00-
20.00  
8.00-
10.00
≤2.00 ≤0.035 ≤0.03 - ≤1.00 - - -
304N1 0Cr19Ni9N ≤0.08 18.00-
20.00  
7.00-
10.50
≤2.00 ≤0.035 ≤0.03 - ≤1.00 - 0.10-
0.25
-
304N2 0Cr18Ni
10NbN
≤0.08 18.00-
20.00  
7.00-
10.50
≤2.00 ≤0.035 ≤0.03 - ≤1.00 - 0.15-
0.30
Nb≤0.15
304LN 00Cr18Ni
10N
≤0.03 17.00-
19.00
8.50-
11.50
≤2.00 ≤0.035 ≤0.03 - ≤1.00 - 0.12-
0.22
-
305 1Cr18Ni12 ≤0.12 17.00-
19.00
10.50-
13.00
≤2.00 ≤0.035 ≤0.03 - ≤1.00 -   -
309S 0Cr23Ni13 ≤0.08 22.00-
24.00
12.00-
15.00
≤2.00 ≤0.035 ≤0.03 - ≤1.00 -   -
310S 0Cr25Ni20 ≤0.08 24.00-
26.00
19.00-
22.00
≤2.00 ≤0.035 ≤0.03 - ≤1.00 - - -
316 0Cr17Ni
12Mo2
≤0.08 16.00-
18.50
10.00-
14.00
≤2.00 ≤0.035 ≤0.03 2.00-
3.00
≤1.00 - - -
  1Cr18Ni
12Mo2Ti6)
≤0.12 16.00-
19.00
10.00-
14.00
≤2.00 ≤0.035 ≤0.03 1.80-
2.50
≤1.00 - - Ti5
(C%-0.02)~
0.08
  0Cr18Ni
12Mo2Ti
≤0.08 16.00-
19.00
10.00-
14.00
≤2.00 ≤0.035 ≤0.03 1.80-
2.50
≤1.00 - - Ti5*C%-
0.70
316L 00Cr17Ni
14Mo2
≤0.03 16.00-
18.00
12.00-
15.00
≤2.00 ≤0.035 ≤0.03 2.00-
3.00
≤1.00 - - -
316N 0Cr17Ni
12Mo2N
≤0.08 16.00-
18.00
10.00-
14.00
≤2.00 ≤0.035 ≤0.03 2.00-
3.00
≤1.00 - - -
316N 00Cr17Ni
13Mo2N
≤0.03 16.00-
18.50
10.50-
14.50
≤2.00 ≤0.035 ≤0.03 2.00-
3.00
≤1.00 - - -
316J1 0Cr18Ni
12Mo2Cu2
≤0.08 17.00-
19.00
10.50-
14.50
≤2.00 ≤0.035 ≤0.03 1.20-
2.75
≤1.00 1.00-
2.50
- -
316J1L 00Cr18Ni
14Mo2Cu2
≤0.03 17.00-
19.00
12.00-
16.00
≤2.00 ≤0.035 ≤0.03 1.20-
2.75
≤1.00 1.00-
2.50
- -
317 0Cr19Ni
13Mo3
≤0.12 18.00-
20.00
11.00-
15.00
≤2.00 ≤0.035 ≤0.03 3.00-
4.00
≤1.00 - - -
317L 00Cr19Ni
13Mo3
≤0.08 18.00-
20.00
11.00-
15.00
≤2.00 ≤0.035 ≤0.03 3.00-
4.00
≤1.00 - - -
  1Cr18Ni
12Mo3Ti6)
≤0.12 16.00-
19.00
11.00-
14.00
≤2.00 ≤0.035 ≤0.03 2.50-
3.50
≤1.00 - - Ti5
(C%-0.02)~
0.08
  0Cr18Ni
12Mo3Ti
≤0.08 16.00-
19.00
11.00-
14.00
≤2.00 ≤0.035 ≤0.03 2.50-
3.50
≤1.00 - - Ti5*C%-
0.70
317J1 0Cr18Ni
16Mo5
≤0.04 16.00-
19.00
15.00-
17.00
≤2.00 ≤0.035 ≤0.03 4.00-
6.00
≤1.00 - - -
321 1Cr18Ni9Ti6) ≤0.12 17.00-
19.00
8.00-
11.00
≤2.00 ≤0.035 ≤0.030 - ≤1.00 - - Ti5
(C%-0.02)~
0.08
  0Cr18Ni10Ti ≤0.08 17.00-
19.00
9.00-
12.00
≤2.00 ≤0.035 ≤0.03 - ≤1.00 - - Ti≥5*C%
347 0Cr18Ni11Nb ≤0.08 17.00-
19.00
9.00-
13.00
≤2.00 ≤0.035 ≤0.03 - ≤1.00 - - Nb≥10*C%
XM7 0Cr18Ni9Cu3 ≤0.08 17.00-
19.00
8.50-
10.50
≤2.00 ≤0.035 ≤0.03 - ≤1.00 3.00-
4.00
- -
XM15J1 0Cr18Ni13Si4 ≤0.08 15.00-
20.00
11.50-
15.00
≤2.00 ≤0.035 ≤0.03 - 3.00-
5.00
  - 2)
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