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Comparing US American (ASTM) and British (BSi) piping standards - specifications, grades and material descriptions
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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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