ASTM A249 TP304N/TP304LN welded stainless steel pipe specification for welded austenitic steel boiler,superheater,heat-exchanger,and condenser tubes.
ASTM A249 TP304N/TP304LN chemical composition
| Grade | C | Mn | P | S | Si | Cr |
| TP304N | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0-20.0 |
| TP304LN | 0.03 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0-20.0 |
ASTM A249 TP304N/TP304LN tensile and hardness requirements
| Grade | UNS | Tensile strength min,ksi mpa | Yield strength min,ksi mpa | Elongation in 2in.or 50mm min% | Rockwell hardness number,max |
| TP304N | S30451 | 80[550] | 35[240] | 35 | B90 |
| TP304LN | S30453 | 75[515] | 30[205] | 35 | B90 |
ASTM A249 TP304N/TP304LN welded stainless steel pipe size in a lot heat treated by the continuous process
| Size of tube | Size of lot |
| 2in.[50.8mm] and over in outside Diameter and 0.200in.[5.1mm] and over in wall thickness | Not more than 50 tubes |
| Less than 2in.[50.8mm] but over 1in. [25.4mm] in outside diameter or over 1in. [25.4mm] in outside diameter and under 0.200 in [5.1mm] in wall thickness | Not more than 75 tubes |
| 1 in.[25.4] or less in outside diameter | Not more than 125 tubes |
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