YUHONG HOLDING GROUP CO., LTD
| Payment Terms | L/C,T/T |
| Delivery Time | 7 DAYS |
| Packaging Details | Ply-wooden Case /Iron Case/ Bundle with plastic Cap |
| Product Name | U Bend Tube |
| Standard | ASTM A213, ASME SA213 |
| Material | TP321 / UNS S32100 / 1.4541 |
| OD | 1/4" , 3/8", 1/2", 5/8", 3/4", 1", 1.1/4", etc. |
| Thickness | BWG10-25 |
| Length | Can Custom |
| End | Plain End, Beveled End |
| High Light | ASTM A213 TP321 Stainless Steel Seamless Tube, U Bend Heat Exchanger Tube |
| Brand Name | YUHONG |
| Model Number | ASTM A213 TP321 Stainless Steel Seamless U Bend Tube |
| Certification | ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008 |
| Place of Origin | CHINA |
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Product Specification
| Payment Terms | L/C,T/T | Delivery Time | 7 DAYS |
| Packaging Details | Ply-wooden Case /Iron Case/ Bundle with plastic Cap | Product Name | U Bend Tube |
| Standard | ASTM A213, ASME SA213 | Material | TP321 / UNS S32100 / 1.4541 |
| OD | 1/4" , 3/8", 1/2", 5/8", 3/4", 1", 1.1/4", etc. | Thickness | BWG10-25 |
| Length | Can Custom | End | Plain End, Beveled End |
| High Light | ASTM A213 TP321 Stainless Steel Seamless Tube, U Bend Heat Exchanger Tube | Brand Name | YUHONG |
| Model Number | ASTM A213 TP321 Stainless Steel Seamless U Bend Tube | Certification | ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008 |
| Place of Origin | CHINA | ||
| High Light | ASTM A213 TP321 stainless steel U bend tube ，seamless heat exchanger tube with warranty ，U bend tube for heat exchangers | ||
ASTM A213 TP321 / UNS S32100 Stainless Steel U Bend Tube U Bent Heat Exchanger Tube
Key Material Advantage: Stabilization
The primary advantage of TP321 over common grades like 304/304L or 316/316L is its resistance to sensitization.
Problem (Sensitization): When standard austenitic steels are held in a temperature range of about 425-850°C (800-1550°F), carbon migrates to grain boundaries and reacts with chromium, forming chromium carbides. This depletes chromium in adjacent areas, creating a path for intergranular corrosion.
TP321 Solution: The added titanium has a stronger affinity for carbon than chromium. It forms stable titanium carbides instead, leaving the chromium in solution to maintain corrosion resistance. This makes TP321 ideal for services involving high temperatures or repeated heating/cooling cycles through the sensitization range.
ASTM A213 TP304H Stainless Steel Seamless Tube Equivalent Grade
| STANDARD | WERKSTOFF NR. | UNS | JIS | EN |
| SS 321 | 1.4541 | S32100 | SUS 321 | X6CrNiTi18-10 |
ASTM A213 TP321 Stainless Steel Seamless U bend Tube Chemical Composition (%)
| C | Mn | P | S | Si | Cr | Ni | Ti |
| 0.08 | 2.00 | 0.045 | 0.03 | 1.00 | 17.0-19.0 | 9.0-12.0 | 5(C+N)-0.7 |
ASTM A213 TP321 Stainless Steel Seamless U bend Tube Mechanical Properties
| Tensile Strength min. | Yield Strength min. | Elongation (%) | Hardness max | |
| 75ksi (515MPa) | 30ksi (205MPa) | 35min | 192HBW/200HV | 90 HRB |
Critical Considerations for U-Bend Tubes
Seamless vs. Welded: As per A213, these tubes are seamless. This eliminates any longitudinal weld seam, which is a benefit for high-pressure/high-temperature service and avoids any theoretical weld line in the bend region.
Post-Bend Heat Treatment: While TP321 is stabilized, severe cold bending (forming the U-bend) induces high residual stresses. A full solution annealing heat treatment after bending is strongly recommended and often specified. This:
Relieves bending stresses to prevent Stress Corrosion Cracking (SCC).
Re-dissolves any carbides and restores optimal corrosion resistance.
Ensures dimensional stability.
Bend Geometry: The minimum bend radius (R) is critical (e.g., R=1.5 x Tube Diameter). Tighter bends increase wall thinning on the outer radius and risk of ovality. Dimensional standards must be strictly followed.
Enhanced Inspection: The bend area is a focal point for Non-Destructive Testing (NDT), typically Dye Penetrant Testing (PT), to detect any surface defects like micro-cracking initiated during forming.
Company Details
Business Type:
Manufacturer,Importer,Exporter,Trading Company,Seller,Other
Year Established:
1990
Total Annual:
50M-70M
Employee Number:
50~800
Ecer Certification：
Verified Supplier
Yuhong Holding Group has more than 35 years experience for pipeline products, till now we have 3 big joint venture factories, the total production area more than 130000 square meters, and more than 600 workers with 106 production lines give our clients excellent supporting always. &n... Yuhong Holding Group has more than 35 years experience for pipeline products, till now we have 3 big joint venture factories, the total production area more than 130000 square meters, and more than 600 workers with 106 production lines give our clients excellent supporting always. &n...
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