Yuhong Group Co.,Ltd
Yuhong Holding Group Co.,LTD
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ASTM A790 A789 S31803 1.4462 S32750 1.4410 Super Duplex Stainless Steel Pipe For Chemical Process Plant
ASTM A790 UNS S31803, UNS S32750 and UNS S32760 are duplex steel grades, which have high chromium and molybdenum elements, ASTM A790 UNS S31803 is the most widely used duplex stainless and it has excellent corrosion resistance, and high strength feature. Generally UNS S31803 Duplex stainless steel pipe is applied in corrosion and high-temperature environment. ASTM A790 UNS S32750 and ASTM A790 UNS S32760 are super duplex steel grades. ASTM A790 UNS S32750 Super Duplex Steel Pipe is an austenitic-ferritic stainless steel. It has excellent resistance to pitting and crevice corrosion. In chemical composition, the higher chromium and molybdenum content will ensure high tensile strengths and exhibits high thermal conductivity and low thermal expansion.
Specifications:
| Specification | ASTM A789, ASTM A790, ASTM A928, ASME SA789, ASME SA790, ASME SA928 |
| Grades | UNS S32205, UNS S31803, UNS S32750, UNS S32760 |
| Type | Seamless / Welded / ERW / EFW / Cold Draw / Hot Finish / Cold Finish |
| Outer Diameter Size | Seamless - 1/2” To 18” Welded / ERW- 1" To 48" |
| Wall Thickness | Schedule 10 To Schedule 160 |
| Length | 6 Meters, Single Random Length, Double Random Length Or Customize Size |
| Pipes Ends | Plain Ends / Beveled Ends |
| Delivery Conditions | As Rolled, Formed, Stress Relieved, Annealed, Hardened, Tempered, Cold Draw, Bright Annealed |
| Coating | Electropolish, Mechanical Polish, Satin Finish, Passivated |
Chemical Composition:
| Grade | % | C | Mn | Si | P | S | Cr | Mo | Ni | N |
| UNS S31803 | Min Max | 0 - 0.03 | 0 - 2.00 | 0 - 1.00 | 0 - 0.03 | 0 - 0.02 | 21.0 - 23.0 | 2.5 - 3.5 | 4.5 - 6.5 | 0.08 - 0.20 |
| Grade | C≤ | Mn≤ | P≤ | S≤ | Si≤ | Ni | Cr | Mo | N | Cu |
| S32750 | 0.03 | 1.20 | 0.035 | 0.02 | 0.80 | 6.0-8.0 | 24.0-26.0 | 3.0-5.0 | 0.24-0.32 | 0.5 |
Mechanical Composition:
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
| Rockwell C (HR C) | Brinell (HB) | ||||
| UNS S31803 | 621 | 448 | 25 | 31 max | 293 max |
| Grades | Tensile, min, ksi[MPa] | Yield, min, ksi[MPa] | Elongation, %(min) | Hardness, HB(max) |
| UNS S32750 | 116 [800] | 80 [550] | 15 | 300 |
| Grades | Density (g/cm 3) | Density (lb/in 3) | Melting Point (°C) | Melting Point (°F) |
| UNS S31803 | 7.805 | 0.285 | 1420 – 1465 | 2588 – 2669 |
| UNS S32750 | 7.8 | 0.281 | 1350 | 2460 |
Applications:
Oil and Gas Industry
Chemical Process Industry
Marine Industry and Shipbuilding
Pollution Control
Pulp and Paper Industry
Food Process Industry
Agrochemicals
Civil Engineering
Petrochemical Industry
