| A312/A312M Stainless Steel Pipe Composition Percentage* Chart |
|---|
| Grade | Carbon (C) | Maganese (Mn) | Phosporus (P) | Sulphur (S) | Silicon (Si) | Chromium (Cr) | Nickel (Ni) | Molybenum (Mo) | Titanium (Ti) | Niobium (Nb) | Nitrogen (N) | UNS (#) | Tensile (ksi) (Min) | Yield (ksi) (Min) |
| 304 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0 -20.0 | 8.0 -11.0 | … | … | … | … | S30400 | 75 | 30 |
| 304L | 0.035 (A) | 2.00 | 0.045 | 0.030 | 1.00 | 18.0 -20.0 | 8.0 -13.0 | … | … | … | … | S30403 | 70 | 25 |
| 304H | 0.04 - 0.10 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0 -20.0 | 8.0 - 11.0 | … | … | … | … | S30409 | 75 | 30 |
| 310S | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 24.0 -26.0 | 19.0 -22.0 | 0.75 | … | … | … | S31008 | 75 | 30 |
| 310H | 0.04-0.010 | 2.00 | 0.045 | 0.030 | 1.00 | 24.0 -26.0 | 19.0 -22.0 | … | … | … | … | S31009 | 75 | 30 |
| 316 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 16.0 -18.0 | 10.0 -14.0 | 2.0-3.0 | … | … | … | S31600 | 75 | 30 |
| 316L | 0.035 (A) | 2.00 | 0.045 | 0.030 | 1.00 | 16.0 -18.0 | 10.0 -14.0 | 2.0-3.0 | … | … | … | S31603 | 70 | 25 |
| 316H | 0.04-0.10 | 2.00 | 0.045 | 0.030 | 1.00 | 16.0 -18.0 | 10.0 -14.0 | 2.0-3.0 | … | … | … | S31609 | 75 | 30 |
| 317 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0-20.0 | 11.0-15.0 | 3.0-4.0 | … | … | … | S31700 | 75 | 30 |
| 317L | 0.035 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0-20.0 | 11.0-15.0 | 3.0-4.0 | … | … | … | S31703 | 75 | 30 |
| 321 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 17.0 -19.0 | 9.0 -12.0 | … | (B) | … | 0.10 | S32100 | 75 | 30 |
| 321H | 0.04 -0.10 | 2.00 | 0.045 | 0.030 | 1.00 | 17.0 -19.0 | 9.0 -12.0 | … | 4(C+N) min; 0.70 max | … | 0.10 | S32109 | 75 | 30 |
| 347 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 17.0 -19.0 | 9.0 -13.0 | … | … | (C) | … | S34700 | 75 | 30 |
| 347H | 0.04 -0.10 | 2.00 | 0.045 | 0.030 | 1.00 | 17.0 -19.0 | 9.0 -13.0 | … | … | (D) | … | S34709 | 75 | 30 |
| *Maximum unless otherwise indicated. Where (…) appears in this table, there is no requirement and analysis for the element need not be determined or reported. | ||||||||||||||
| (A) For small diameter or thin walls or both, where many drawing passes are required, a carbon maximum of 0.040% is necessary in grades TP304L and TP316L. Small outside diameter tubes are defined as those less than 0.500 in. [12.7 mm] in outside diameter and light wall tubes as those less than 0.049 in. [1.20 mm] in average wall thickness (0.044 in. [1.10 mm] in minimum wall thickness). | ||||||||||||||
| (B) Type 321: For Titanium 5(C+N) min; 0.70 max. | ||||||||||||||
| (C) Type 347: The Niobium content shall not be less than 10 times the carbon content and not more than 1.00% | ||||||||||||||
| (D) Type 347H: The Niobium content shall not be less than 8 times the carbon content and not more than 1.0% | ||||||||||||||
| All percentages are based on ASTM A312/A312M-17 references as of 6/28/2018. | ||||||||||||||
