Yuhong Group Co.,Ltd
| Payment Terms | L/C, T/T |
| Delivery Time | 7 DAYS |
| Packaging Details | PLY-WOODEN CASE OR PALLET |
| Product Name | Concentric Reducer |
| Standard | ASTM A403 / ASME SA403 |
| Material | 304/304L/304H, 316L, 347H, 321, 321H, etc. |
| Sizes | 1/2" NB - 48" NB |
| Wall Thickness Available | Schedule 10s - Schedule XXS |
| Shape | Concentric Reducer, Eccemtric Reducer |
| Type | Seamless, Welded |
| High Light | ASTM A403 WP321H Stainless Steel Con. Reducer, ASME B16.9 Buttweld Pipe Fitting |
| Brand Name | YUHONG |
| Model Number | ASTM A403 WP321H Stainless Steel Con. Reducer |
| Certification | ISO, API, PED , ABS, DNV, BV, LR |
| 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 OR PALLET | Product Name | Concentric Reducer |
| Standard | ASTM A403 / ASME SA403 | Material | 304/304L/304H, 316L, 347H, 321, 321H, etc. |
| Sizes | 1/2" NB - 48" NB | Wall Thickness Available | Schedule 10s - Schedule XXS |
| Shape | Concentric Reducer, Eccemtric Reducer | Type | Seamless, Welded |
| High Light | ASTM A403 WP321H Stainless Steel Con. Reducer, ASME B16.9 Buttweld Pipe Fitting | Brand Name | YUHONG |
| Model Number | ASTM A403 WP321H Stainless Steel Con. Reducer | Certification | ISO, API, PED , ABS, DNV, BV, LR |
| Place of Origin | CHINA | ||
| High Light | WP321H Stainless Steel Concentric Reducer ，Buttweld Fitting Concentric Reducer ，A403 Concentric Reducer | ||
ASTM A403 / ASME SA403 WP321H Concentric Reducer, B16.9 Stainless Steel Buttweld Pipe Fittings
ASTM A403 WP321H concentric reducer is a high-performance fitting designed for extreme heat and corrosive environments. Stainless Steel Grade 321H, the "H" suffix (per ASTM A403/A403M) ensures controlled carbon content for elevated temperature service. Titanium binds carbon, preventing chromium carbide precipitation (sensitization) during welding/exposure to 425–815°C. High-Temp Performance: Retains strength and resists oxidation up to 815°C (1500°F). Corrosion Resistance: Resists general corrosion, acids, and chlorides (similar to 304/316).
Material Equivalent of ASTM A403 WP321/321H Stainless Steel Concentric Reducer
| STANDARD | WERKSTOFF NR. | UNS | JIS | EN |
| SS 321 | 1.4541 | S32100 | SUS 321 | X6CrNiTi18-10 |
| SS 321H | 1.4878 | S32109 | SUS 321H | X12CrNiTi18-9 |
Chemical Equation of ASTM A403 WP321/321H Stainless Steel Concentric Reducer
| Grade | C | Mn | Si | P | S | Cr | N | Ni | Ti |
| SS 321 | 0.08 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 - 19.00 | 0.10 max | 9.00 - 12.00 | 5(C+N) - 0.70 max |
| SS 321H | 0.04 - 0.10 | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 - 19.00 | 0.10 max | 9.00 - 12.00 | 4(C+N) - 0.70 max |
Mechanical Characteristics of ASTM A403 WP321/321H Stainless Steel Concentric Reducer
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 8.0 g/cm3 | 1457 °C (2650 °F) | Psi - 75000 , MPa - 515 | Psi - 30000 , MPa - 205 | 35 % |
Inspection & Testing
PT (Penetrant Testing): Mandatory for detecting surface cracks after forming/welding.
Additional Tests:
PMI (Positive Material Identification): Verifies Ti/Ni/Cr/C content.
Hydrostatic Test: Pressure integrity validation.
Hardness Test: Ensures proper annealing.
Certification: Mill Test Reports (MTRs) confirming compliance with ASTM/ASME.
Application
High-Temperature Systems: power plant boilers, superheaters, steam lines.
Critical Services: Where thermal cycling or weld decay risks exist
PT TEST
The purpose of Penetrant Testing (PT) for steel pipe fittings is to detect surface-breaking discontinuities (defects) that could compromise the fitting's integrity, leading to leaks, failures, or safety hazards. It's a critical non-destructive testing (NDT) method used primarily for quality control and assurance.
Company Details
Business Type:
Manufacturer,Distributor/Wholesaler,Importer,Exporter,Trading Company,Seller,Other
Year Established:
2007
Total Annual:
50M-70M
Employee Number:
50~850
Ecer Certification：
Verified Supplier
Yuhong Group is one of the large scale group company in China, more than 35 years experience in the international market, providing high-quality services to over 3000 customers, end user which like Aramco, Petrobras, Pemex, Petronas, Ecopetro, Petroecuador, …. till now Yuhong Grou... Yuhong Group is one of the large scale group company in China, more than 35 years experience in the international market, providing high-quality services to over 3000 customers, end user which like Aramco, Petrobras, Pemex, Petronas, Ecopetro, Petroecuador, …. till now Yuhong Grou...
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