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Comparing American and British
Piping Standards
Comparing US
American (ASTM) and British (BSi) piping standards - specifications,
grades and material descriptions
The table below
can be used to compare different British (BSi) and American (ASTM)
piping standards.
| ASTM
International |
BSi
- British Standards institute |
Material |
| A120 |
1387 |
Carbon
Steel |
| A53
Gr. A |
3601/23 |
Carbon
Steel |
| A53
Gr. B |
3601/27 |
Carbon
Steel |
| A106
Gr. A |
3602/23 |
Carbon
Steel |
| API
5L Gr. A |
3602/27 |
Carbon
Steel |
| A106
Gr. B |
2602/27 |
Carbon
Steel |
| API
5L Gr. B |
3602/27 |
Carbon
Steel |
| A333
Gr. 1 |
3063/LT50 |
Killed
Carbon Steel |
| A333
Gr. 3 |
3603/503LT100 |
3.5%
nickel |
| A335
Gr. P1 |
3604/240 |
1/2%
molybdenum |
| A335
Gr. P12 |
3604/620 |
1% Cr
1/2% Mo |
| A335
Gr. P11 |
3604/621 |
1 1/4%
Cr 1/2% Mo |
| A335
Gr. P22 |
3604/622 |
2 1/4%
Cr 1% No |
| A335
Gr. P5 |
3604/625 |
5% Cr
1/2% Mo |
| A335
Gr. P7 |
3604/627 |
7% Cr
1/2% Mo |
| A335
Br. P9 |
3604/629 |
9% Cr
1% Mo |
| A312
Gr. Tp304 |
3605/304
S18 (EN58E) |
Austenitic
chromium nickel |
| A312
Gr. Tp304L |
3605/304
S14 |
Austenitic
chromium nickel (extra low carbon) |
| A312
Gr. Tp316 |
3605/316
S18 (EN58J) |
Austenitic
chromium nickel molybdenum bearing |
| A312
Gr.Tp316L |
3605/316
S14 |
Austenitic
chromium nickel molybdenum bearing (extra low carbon) |
| A312
Gr. Tp321 |
3605/321
S18 (EN58B) |
Austenitic
chromium nickel titanium stabilized |
| A312
Gr. Tp347 |
3605/347
S18 (EN58G) |
Austenitic
chromium nickel nobelium stabilized |
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