Yuhong Group Co., Ltd. supplies ASME SA179 seamless U-tubes for tubular heat exchangers, condensers and similar heat-transfer apparatus. The product is a seamless, cold-drawn, low-carbon steel tube with minimum wall thickness, manufactured to ASME SA179. It is specified where a U-tube bundle requires defined low-carbon chemistry, heat treatment after the final cold draw, a scale-free surface and controlled hardness.
Differentiation lies in the standard evidence: chemistry is limited to C 0.06–0.18%, Mn 0.27–0.63%, and P/S max 0.035%; hardness is max 72 HRBW; final heat treatment is 650°C [1200°F] or higher. Alloy grades requiring elements outside this chemistry are not permitted. For U-bend supply, please provide OD, minimum wall, bend radius and leg length.
| Element | Requirement |
|---|---|
| Carbon, % | 0.06–0.18 |
| Manganese, % | 0.27–0.63 |
| Phosphorus, max, % | 0.035 |
| Sulfur, max, % | 0.035 |
| Item | ASME SA179 Requirement |
|---|---|
| OD range | 3.2–76.2 mm [1/8–3 in.] inclusive |
| Process | Seamless, cold-drawn |
| Heat treatment | After final cold draw, ≥650°C [1200°F] |
| Hardness | ≤72 HRBW |
| Surface | Free of scale; slight oxidation is not considered scale |
| Design assumptions | Tensile min 47 ksi [325 MPa]; yield min 26 ksi [180 MPa]; elongation min 35% in 2 in./50 mm |
| Required tests | Flattening and flaring on two tubes per lot or fraction; hardness on two tubes per lot; hydrostatic on each tube or NDT electric when specified |
| Flange test | When specified as a flaring substitute for wall <10% OD |
Use ASME SA179 when the service calls for low-carbon steel and the purchase order can define minimum wall and U-bend geometry. The standard does not permit alloy additions outside the specified chemistry; if a project requires another chemistry, do not specify it as ASME SA179. For small tubes, mechanical property requirements do not apply below 3.2 mm OD or below 0.4 mm wall.
| Selection Point | Specify in RFQ |
|---|---|
| Chemistry | ASME SA179 low-carbon steel |
| Tube size | OD and minimum wall |
| U-bend | Bend radius, leg length, orientation |
| Testing | Hydrostatic or NDT electric; product analysis if required |
| Documentation | Test report and marking with purchaser name/order number |
In a shell-and-tube condenser with a U-tube bundle, ASME SA179 seamless U-tubes serve as the heat-transfer tubes. Compliance is demonstrated by chemistry, hardness ≤72 HRBW, heat treatment ≥650°C after final cold draw, and the specified flattening, flaring/flange and hydrostatic/NDT tests. Product analysis, when requested, is made from 1 tube per 250 pieces or 1 tube per heat. This gives the buyer a defined inspection path rather than a generic "steel tube" claim.
Governing standard: ASME SA179. Certification/test report scope must be stated in the RFQ/PO; no additional standard is implied. Product marking includes purchaser name and order number.
No. U-bend is a geometry; the tube is ordered to ASME SA179 with bend data.
Mechanical property requirements do not apply; confirm acceptance on the PO.
1 tube per 250 pieces, or 1 tube per heat; failed analysis follows the retest/rejection rules.
U-tubes are bundled with end protection and separators; tags show size, heat and order. Export packing and shipping mode are per request. Marking includes purchaser name and order number.
Send your RFQ with quantity, OD, minimum wall, U-bend radius, leg length, test report and destination to Yuhong Group Co., Ltd. via our website.
We will confirm MOQ, FOB/CIF port and lead time against the ASME SA179 requirements.
