304 304L 304LN 304H Stainless Steel Tubing and Pipe
In general, 304 has a lower carbon content than 304L and has better corrosion resistance, so it can be used instead of 304 material. It is true that 304L meets the requirements of 304, and is better than 304. It seems that it can automatically replace 304. However, from the mechanical properties of Table 2, the strength of 304 is higher than 304L. When designing according to 304, replacing with 304L will result in strength. In addition, in China’s pressure vessel standard GB150-1998, 4.1.6 stipulates that: when the use temperature of austenitic stainless steel is higher than 525 °C, the carbon content in steel should not be less than 0.035%. It can be seen from Table 1 that most of the 304 can be used, but 304L cannot be used. Therefore, the view that 304L can be used instead of 304 is wrong, can be used in connection with the use of the occasion, and according to the regulations. We have no right to carry out “material substitution”, only the original design department can have the right to “material substitution”.
Sizes | Sizes | Sizes | Standard Tolerances | Tolerances | Tolerances | ||
| Products | OD | Wall | Lengths and/or coils | Grades | OD | Wall | Lengths |
| Welded Austenitic Steel Boiler, Super Heater, Heat-Exchanger Tube & Condenser TubesSpecifications: ASTM-A249, ASME-SA249, ASTM-A688, ASME-SA688 | 0.5″ (6 mm) to 12 ” (323.85 mm)Metric sizes available | 0.020″ (0.51 mm) to 1.312 ” (33.325 mm) | Random sor cut lengths to Customer Requirements | 304/304L/ 304LN/304H | Under 1″ (25.4 mm) ±0.004″ (0.10 mm) 1″ (25.4 mm) to1-1/2″ (38.1 mm) ±0.006″ (0.15 mm)>1-1/2″ (38.1 mm) to 2″ (50.8 mm) ±0.008″ (0.20 mm)>2″ (50.8 mm) to 2-1/2″ (63.5 mm) ±0.010″ (0.25 mm)>2-1/2″ (63.5 mm) to 3″ (76.2 mm) ±0.012″ (0.30 mm)3″ (76.2 mm) to 4″ (101.6 mm) ±0.015″ (0.38 mm) | ±10% | Randoms up to +2″ (50.8 mm) Cuts +1/8″ (3 mm) -0″ Coils to 80,000′ (24,384 m) |
| Pressure & Corrosion Stainless Steel Tube Meets or exceeds requirements for weldedSpecifications: ASTM-A269, ASTM-A1016, and ASTM-A632 | 1/16″ (1.59 mm) to 4″ (101.6 mm)Metric sizes available | 0.010″ (0.25 mm) to 0.220″ (5.59 mm) | Random or cut lengths up to 90′ (27.4 m) Coils to 1-1/2″ OD | 304/ 304L/304H | <1-1/2″ (38.1 mm) ±0.005″ (0.13 mm) 1-1/2″ (38.1 mm) to 3″ (76.2 mm) ±0.010″ (0.25 mm)3-1/2″ (88.9 mm) to 4″ (101.6 mm) ±0.015″ (0.38 mm) | ±10% | Randoms up to +2″ (50.8 mm) Cuts +1/8″ (3 mm) -0″ Coils to 80,000′ (24,384 m) |
| Beverage Stainless Steel Tubing | 1/4″(6.35 mm) 5/16″ (7.94 mm) 3/8″ (9.53 mm) 1/2″ (12.7 mm)Metric sizes available | 0.020″ (0.51 mm) to 0.028″ (0.71 mm) | Random or cut lengths up to 40′ (12.2 m) | 304/ 304L/304H | ±0.005″ (0.13 mm) | ±10% | Randoms up to +2″ (50.8 mm) Cuts +1/8″ (3 mm) -0″ Coils to 15,000′ (4,572 m) |
| Instrumentation TubingSpecifications: ASTM-A269 and ASTM-A632 | 1/16″ (1.59 mm) to 1/2″ (12.7 mm)Metric sizes available | 0.010″ (0.25 mm) to 0.065″ (1.65 mm) | Random or cut lengths up to 40′ (12.2 m) | 304/ 304L/304H | ±0.005″ (0.13 mm) | ±10% | Randoms up to +2″ (50.8 mm) Cuts +1/8″ (3 mm) -0″ |
| Food/Dairy Tubing, Pharmaceutical/ BioPharmaceutical Tubing, High Purity Tubing, Ultra High Purity Tubing | 1/2″ (12.7 mm) to 8″ (203.2 mm) | 0.049″ (1.24 mm) to 0.109″ (2.77 mm) | 20′ (6.1 m) stock lengths. Other lengths available upon request. | 304/304L | 1/2″ (12.7 mm) ±0.005″ (0.13 mm)3/4″ (19.1 mm) ±0.005″ (0.13 mm)1″ (25.4 mm) ±0.005″ (0.13 mm)1-1/2″ (38.1 mm) ±0.008″ (0.20 mm)2″ (50.8 mm) ±0.008″ (0.20 mm)2-1/2″ (63.5 mm) ±0.010″ (0.25 mm)3″ (76.2 mm) ±0.010″ (0.25 mm)4″ (101.6 mm) ±0.015″ (0.38 mm)6″ (152.4 mm) ±0.030″ (0.76 mm)8″ (203.2 mm) +0.061″ (1.55 mm), -0.031″ (0.79 mm) | ±10% ±10% ±10% ±10% ±10% ±10% ±10% ±10% ±10% ±10% | +1/8″ (3 mm) -0″ +1/8″ (3 mm) -0″ +1/8″ (3 mm) -0″ +1/8″ (3 mm) -0″ +1/8″ (3 mm) -0″ +1/8″ (3 mm) -0″ +1/8″ (3 mm) -0″ +1/8″ (3 mm) -0″ +1″ (25.4 mm) -0″ +1″ (25.4 mm) -0 |
Mechanical Properties of 304/304L/304LN/304H Alloys in the Annealed Condition at -20°F to +100°F
| Tensile Strength | Tensile Strength | Tensile Strength | Yield Strength | Yield Strength | Yield Strength | |||||||||
| Alloy | UNS | Spec. | psi | Mpa | ksi | psi | MPa | ksi | Elong ation in 2 inches (min.) % | Grain Size Req. | Max. Hard ness | Modulus of Elasticity (x106 psi) | Mean Coefficient of Thermal Expansion (IN./IN. /°F x 10-6) | Thermal Condu ctivity (BTU-in/ft2-h-°F) |
| 304 | S30400 | A249, A312 | 75, 000 | 515 | 75 | 30, 000 | 205 | 30 | 35 | — | 90 Rb | 28.0 | 9.2 | 116 |
| 304L | S30403 | A270 A312 | 70, 000 | 485 | 70 | 25, 000 | 170 | 25 | 35 | — | 90 Rb | 28.0 | 9.2 | 116 |
| 304LN | S30453 | A249, A688 | 75, 000 | 515 | 75 | 30, 000 | 205 | 30 | 35 | — | 90 Rb | 28.0 | 9.2 | 116 |
| 304H | A30409 | A249, A312 | 75, 000 | 515 | 75 | 30, 000 | 205 | 30 | 35 | 7 or coar ser | 90 Rb | 28.0 | 9.2 | 116 |
ASTM A213 304/304L/304LN/304H tubing and pipe Chemical Composition
| Grade | 304 | 304L | 304LN | 304H |
| UNS Designation | S30400 | S30403 | S30453 | S30409 |
| Carbon (C) Max. | 0.08 | 0.035* | 0.035 | 0.04 – 0.10 |
| Manganese (Mn) Max. | 2.00 | 2.00 | 2.00 | 2.00 |
| Phosphorous (P) Max. | 0.045 | 0.045 | 0.045 | 0.045 |
| Sulphur (S) Max. | 0.030 | 0.030 | 0.030 | 0.030 |
| Silicon (Si) Max. | 1.00 | 1.00 | 1.00 | 1.00 |
| Chromium (Cr) | 18.0–20.0 | 18.0–20.0 | 18.0–20.0 | 18.0–20.0 |
| Nickel (Ni) | 8.0–11.0 | 8.0–11.0 | 8.0–11.0 | 8.0–11.0 |
| Molybdenum (Mo) | — | — | — | — |
| Nitrogen (N) | — | — | 0.10–0.16 | — |
| Iron (Fe) | Bal. | Bal. | Bal. | Bal. |
| Other Elements | — | — | — | — |
* Maximum carbon content of 0.04% acceptable for drawn tubes304/304L/304LN/304H Product Range
| Alloy | UNS Designation | Werkstoff NR. | Specifications* |
| 304 | S30400 | EN 10216 – 5 1.4301 | A269, A/SA249, A/SA312, A632, A/SA688, A270 |
| 304L | S30403 | EN 10216 – 5 1.4307 | A269, A/SA249, A/SA312, A629, A632, A/SA688, A270 |
| 304LN | S30453 | EN 10216 – 5 1.4311 | A/SA249, A/SA688 |
| 304H | S30409 | EN 10216 -5 1.4948 | A269, A/SA249, A/SA312, A/ SA 688 |
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