What is the difference between pipe specifications ASTM A312 TP 304 & ASTM A312 TP304L, ASTM A312 TP 316 & ASTM A312 TP 316L?

Answer:
Difference is due to the Carbon content. The Letter “L” denotes lower percentage of carbon. % of carbon content in : –
I. ASTM A312 TP 304 – 0.08 %
II. ASTM A312 TP 304L- 0.035%
III. ASTM A312 TP 316 – 0.08 %
IV. ASTM A312 TP 316L- 0.035%

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