Yuhong Group Co., Ltd. supplies ASME SA213 TP304 seamless tubes for boiler, superheater, and heat-exchanger service. TP304 (UNS S30400) is an austenitic grade furnished in the heat-treated condition. Tubes are solution treated at a minimum of 1900°F [1040°C] and cooled by water or other rapid means.
Sizes range from 1/2 in. [3.2 mm] inside diameter to 5 in. [127 mm] outside diameter, with wall thickness from 0.015 to 0.500 in. [0.4 to 12.7 mm]. Each tube is subjected to a hydrostatic or nondestructive electric test.
| Parameter | ASME SA213 TP304 |
|---|---|
| Grade / UNS | TP304 / S30400 |
| Heat Treatment | Solution treatment, min 1900°F [1040°C], water or other rapid cool |
| Tensile Strength, min | 75 ksi [515 MPa] |
| Yield Strength, min | 30 ksi [205 MPa] |
| Elongation, min | 35% |
| Hardness, max | 192 HBW / 200 HV / 90 HRB |
| Size Range | ID 1/2 in. [3.2 mm] to OD 5 in. [127 mm]; wall 0.015–0.500 in. [0.4–12.7 mm] |
| Manufacture | Seamless, hot finished or cold finished |
| Testing | Hydrostatic or nondestructive electric test per tube |
| Grade | UNS | Tensile min ksi [MPa] | Yield min ksi [MPa] | Elongation min % | Hardness max |
|---|---|---|---|---|---|
| TP304 | S30400 | 75 [515] | 30 [205] | 35 | 192 HBW / 200 HV / 90 HRB |
| TP304L | S30403 | 70 [485] | 25 [170] | 35 | 192 HBW / 200 HV / 90 HRB |
| TP316 | S31600 | 75 [515] | 30 [205] | 35 | 192 HBW / 200 HV / 90 HRB |
ASME SA213 TP304 tubes are used in boilers, superheaters, and heat exchangers for high-temperature service. They conform to ASME SA-213/SA-213M. General requirements follow A1016/A1016M.
Optional supplementary requirements include:
Marking includes condition (hot finished or cold finished) and wall designation (minimum or average wall). Typical applications include power plant boilers, petrochemical exchangers, industrial superheaters, and air-cooler tube bundles.
| Scenario | What the Tube Does | Problem Addressed |
|---|---|---|
| Power plant boiler superheater | Carries high-temperature steam under internal pressure and thermal cycling. | Min 75 ksi tensile, 30 ksi yield and 35% elongation support pressure and expansion; per-tube hydrostatic or nondestructive electric test helps identify leakage before installation. |
| Shell-and-tube heat exchanger in petrochemical service | Acts as heat transfer tube in corrosive media. | Austenitic TP304 with optional A262 Practice E test addresses intergranular corrosion risk; solution treatment min 1900°F [1040°C] supports as-shipped corrosion performance. |
| Air-cooler tube bundle | Used as finned tube base pipe. | 30 ksi yield and 35% elongation assist expanding, bending and beading; max 192 HBW / 200 HV / 90 HRB helps maintain forming behavior. |
TP304L has lower carbon and a lower minimum yield strength (25 ksi [170 MPa] vs. 30 ksi [205 MPa] for TP304). TP304L is often selected for welded constructions requiring intergranular corrosion resistance.
Yes. Supplementary Requirement S4 permits testing per Practices A262, Practice E. Stabilization heat treatment per S2 may be necessary for certain grades.
Yes. Per ASME SA213 6.2.2, seamless tubing immediately following hot forming may be individually quenched in water or rapidly cooled by other means, provided the temperature after hot forming is not less than the minimum specified heat treatment temperature. TP304 is not in the exception list.
