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ASTM A554 Standard Specification for Welded Stainless Steel Mechnical Tubing. This specification covers welded austenitic,ferritic,and austenitic-ferritic duplex stainless steel mechanical tubing intended for use in ornamental,structural,exhaust,and other applications where appearance,mechanical properties,or corrosion resistance is needed.
This specification covers as-welded or cold-reduced mechanical tubing in sizes to 16 in.(406.4mm)outside dimension,and in wall thicknesses 0.020in.（0.51mm) and over.
Chemical Composition
|
UNS# |
Grade |
C |
Mn |
P |
S |
Si |
Ni |
Cr |
|
|
Austentic |
|||||||
|
S31655 |
MT-301 |
0.150 |
2.00 |
0.045 |
0.030 |
1.00 |
6.0-8.0 |
16.0-18.0 |
|
MT-302 |
0.150 |
2.00 |
0.045 |
0.030 |
1.00 |
8.0-10.0 |
17.0-19.0 |
|
|
MT-304 |
0.080 |
2.00 |
0.045 |
0.030 |
1.00 |
8.0-11.0 |
18-20.0 |
|
|
MT-304L |
0.035 |
2.00 |
0.045 |
0.030 |
1.00 |
8.0-13.0 |
18.0-20.0 |
|
|
MT-305 |
0.120 |
2.00 |
0.045 |
0.030 |
1.00 |
10.0-13.0 |
17.0-19.0 |
|
|
MT-309S |
0.080 |
2.00 |
0.045 |
0.030 |
1.00 |
12.0-15.0 |
22.0-24.0 |
|
|
MT-309S-Cb |
0.080 |
2.00 |
0.045 |
0.030 |
1.00 |
12.0-15.0 |
22.0-24.0 |
|
|
MT-310S |
0.080 |
2.00 |
0.045 |
0.030 |
1.00 |
19.0-22.0 |
24.0-26.0 |
|
|
MT-316 |
0.080 |
2.00 |
0.045 |
0.030 |
1.00 |
10.0-14.0 |
16.0-18.0 |
|
|
MT-316L |
0.035 |
2.00 |
0.045 |
0.030 |
1.00 |
10.0-15.0 |
16.0-18.0 |
|
|
MT-317 |
0.080 |
2.00 |
0.045 |
0.030 |
1.00 |
11.0-14.0 |
18.0-20.0 |
|
|
MT-321 |
0.080 |
2.00 |
0.045 |
0.030 |
1.00 |
9.0-13.0 |
17.0-20.0 |
|
|
MT-330 |
0.150 |
2.00 |
0.045 |
0.030 |
1.00 |
33.0-36.0 |
14.0-16.0 |
|
|
MT-347 |
0.080 |
2.00 |
0.045 |
0.030 |
1.00 |
9.0-13.0 |
17.0-20.0 |
|
|
|
Ferrtic |
|||||||
|
|
MT-429 |
0.120 |
1.00 |
0.045 |
0.030 |
1.00 |
0.50max |
14.0-16.0 |
|
MT-430 |
0.120 |
1.00 |
0.045 |
0.030 |
1.00 |
0.50max |
16.0-18.0 |
|
|
MT-430T |
0.100 |
1.00 |
0.045 |
0.030 |
1.00 |
0.075max |
16.0-19.5 |
|
Mechanical Properties
|
Grade |
Tensile
Strength |
Yield
Strength |
Elongation in 2in.(min,%） |
||
|
MT429 and MT430 |
60 |
414 |
35 |
241 |
20 |
|
MT-430-Ti |
60 |
414 |
30 |
207 |
20 |
|
MT 304L&MT316L |
70 |
483 |
25 |
172 |
35 |
|
S31655 |
92 |
635 |
45 |
310 |
35 |
|
All other austentic steels |
75 |
517 |
30 |
207 |
35 |
|
MT 409 |
55 |
379 |
30 |
207 |
20 |
|
All other ferritic |
60 |
414 |
35 |
241 |
20 |
|
S31803 |
90 |
620 |
65 |
450 |
25 |
|
S32003 |
100 |
690 |
70 |
485 |
25 |
|
S32202 |
94 |
650 |
65 |
450 |
30 |
|
S32205 |
95 |
655 |
65 |
450 |
25 |
|
S32304 |
87 |
600 |
58 |
400 |
25 |
|
S32550 |
110 |
760 |
80 |
550 |
15 |
|
S32750 |
116 |
795 |
80 |
550 |
15 |
|
S32760 |
108 |
750 |
80 |
550 |
25 |
|
S81921 |
90 |
620 |
65 |
450 |
25 |
|
S82011 |
101 |
700 |
75 |
515 |
30 |
