On May 29, I received a new inquiry from a regular customer, which was the same as the previous order, including duplex stainless steel fittings & flanges. The customer was very satisfied after receiving the goods last time.Two days later, we received the customer’s purchase order.
Purchase Order List
| 11 | Elbow 90° LR 2″ Sch 40S SMLS BW Mat. UNS S31803 |
| 12 | Elbow 45° 2″ Sch 40S SMLS BW Mat. UNS S31803 |
| 13 | Elbow 90° LR 3″ Sch 40S SMLS BW Mat. UNS S31803 |
| 14 | Elbow 90° SR 3″ Sch 40S SMLS BW Mat. UNS S31803 |
| 15 | Elbow 45° 3″ Sch 40S SMLS BW Mat. UNS S31803 |
| 16 | Elbow 90° LR 4″ Sch 40S SMLS BW Mat. UNS S31803 |
| 17 | Elbow 45 4″ Sch 40S SMLS BW Mat. UNS S31803 |
| 18 | Elbow 90° LR 6″ Sch 40S SMLS BW Mat. UNS S31803 |
| 19 | Elbow 90° SR 6″ Sch 40S SMLS BW Mat. UNS S31803 |
| 31 | Tee 2″ Sch 40S SMLS Mat. UNS S31803 |
| 32 | Tee 4″ Sch 40S SMLS Mat. UNS S31803 |
| 33 | Tee 6″ Sch 40S SMLS Mat. UNS S31803 |
| 42 | SW Flange 1″ 600# Sch 80S RF Mat. UNS S31803 |
| 43 | SW Flange 1″ 1500# Sch 80S RF Mat. UNS S31803 |
| 44 | SW Flange 1 1/2″ 600# Sch 80S RF Mat. UNS S31803 |
| 45 | WN Flange 2″ 600# Sch 40S RF Mat. UNS S31803 |
| 46 | WN Flange 2″ 90°0/1500# Sch 40S RF Mat. UNS S31803 |
| 47 | WN Flange 3″ 600# Sch 40S RF Mat. UNS S31803 |
| 48 | WN Flange 4″ 300# Sch 40S RF Mat. UNS S31803 |
| 49 | WN Flange 4″ 600# Sch 40S RF Mat. UNS S31803 |
| 54 | Blind Flange 1″ 600# RF Mat.UNS S31803 |
| 55 | WN Flange 3″ 300# Sch 40S RF Mat. UNS S31803 |
After the goods are produced, we provide customers with inspection photos, packaging photos and test reports. Looking forward to the next cooperation with customers.
ASME B16.9 Duplex Stainless Steel Fittings
Duplex Steel are known by it’s highly corrosion resistance properties with respect to the standard austenitic grades or high alloyed ferrite.
We offer a complete range of duplex stainless steel fittings: butt weld elbow, tee, reducer, bend, cap, cross and stub end, which are available in various size, specification, thickness and shapes for meeting customer’s requirements.
Type of Duplex Stainless Steel Fittings
| Duplex Steel 90 Degree Elbow | Duplex Steel 45 Degree Elbow |
| ASTM A815 Concentric Reducer | Duplex Steel Eccentric Reducer |
| A815 Duplex Steel Equal Tee | Duplex Steel Reducing Tee |
| Duplex 5D Bend | UNS S31803 3D Bend |
| Duplex Steel Long Stub End | UNS S32205 Short Stub End |
| Duplex Steel Cross | 2205 Duplex Steel Cap |
ASME B16.9 Duplex Stainless Steel Fittings
Specification of ASME B16.9
Standard: ANSI/ASME B16.9, B16.28, MSS-SP-43
Specification: ASTM / ASME A815 / SA815
Size: NPS 1/2″ to 48″
Thickness: Sch 10S to Sch XXS
Type: Seamless & Welded Butt weld Fittings
Dimension of Duplex Stainless Steel 90 Degree Elbow
| Nominal size | Outside Diameter at Bevel | Center to End | ||
| 90° Elbows | ||||
| DN | NPS | OD | A | |
| LR | SR | |||
| 15 | 1/2 | 21.3 | 38 | – |
| 20 | 3/4 | 26.7 | 38 | – |
| 25 | 1 | 33.4 | 38 | 25 |
| 32 | 1-1/4 | 42.2 | 48 | 32 |
| 40 | 1-1/2 | 48.3 | 57 | 38 |
| 50 | 2 | 60.3 | 76 | 51 |
| 65 | 2-1/2 | 73.0 | 95 | 64 |
| 80 | 3 | 88.9 | 114 | 76 |
| 90 | 3-1/2 | 101.6 | 133 | 89 |
| 100 | 4 | 114.3 | 152 | 102 |
| 125 | 5 | 141.3 | 190 | 127 |
| 150 | 6 | 168.3 | 229 | 152 |
| 200 | 8 | 219.1 | 305 | 203 |
| 250 | 10 | 273.0 | 381 | 254 |
| 300 | 12 | 323.8 | 457 | 305 |
| 350 | 14 | 355.6 | 533 | 356 |
| 400 | 16 | 406.4 | 610 | 406 |
| 450 | 18 | 457.0 | 686 | 457 |
| 500 | 20 | 508.0 | 762 | 508 |
| 550 | 22 | 559.0 | 838 | 559 |
| 600 | 24 | 610.0 | 914 | 610 |
| 650 | 26 | 660.0 | 991 | 660 |
| 700 | 28 | 711.0 | 1067 | 711 |
| 750 | 30 | 762.0 | 1143 | 762 |
| 800 | 32 | 813.0 | 1219 | 813 |
| 850 | 34 | 864.0 | 1295 | 864 |
| 900 | 36 | 914.0 | 1372 | 914 |
| 950 | 38 | 965.0 | 1448 | 965 |
| 1000 | 40 | 1016.0 | 1524 | 1016 |
| 1050 | 42 | 1067.0 | 1600 | 1067 |
| 1100 | 44 | 1118.0 | 1676 | 1118 |
| 1150 | 46 | 1168.0 | 1753 | 1168 |
| 1200 | 48 | 1219.0 | 1829 | 1219 |
The production standard of duplex stainless steel fittings are mainly reflected in standardization and normalization. The duplex stainless steel fittings produced by ZIZI Engineering Co Ltd comply with the ASTM A815 material standard.
What is the Duplex Stainless Steel Grades
Duplex stainless steel fittings have better resistance to sea water than stainless steel grade 316 pipe fittings, and so as the mechanical properties.
Common grades of duplex stainless steel include ASTM A815 UNS 31803,32750, etc.
Chemical Composition
| CHEMICAL | C | Mn | P | S | Si | Cr | Ni | Mo | N | Cu |
| UNS 31803 | 0.03 max | 2.0 max | 0.030 max | 0.020 max | 1.0 max | 21.0-23.0 | 4.5-6.5 | 2.5-3.5 | 0.08-0.20 | / |
| UNS 32750 | 0.03 max | 1.2 max | 0.035 max | 0.020 max | 0.8 max | 24.0-26.0 | 6.0-8.0 | 3.0-5.0 | 0.24-0.32 | 0.5 max |
Mechanical Properties
| MATERIAL | T.S (MPA) | Y.S (MPA) | EL % | HARDNESS |
| UNS S31803 | 620 min | 450 min | 20 min | 290max |
| UNS S32750 | 515 min | 205 min | 28 min | 310max |
Inspection of Duplex Stainless Steel Fittings & Flanges
