Super Duplex Steel UNS S32750 Pipes
gnee pipe team
What is duplex stainless steel material
Duplex Stainless Steel (DSS) is a stainless steel material with two basic organizational structures, namely ferrite (Ferrite) and austenite (Austenite). These two phases usually account for about 50% each, while the remaining components are mainly composed of other elements.
S32750 steel pipe is a ferritic (duplex) stainless steel that combines many beneficial properties of ferritic steel and austenitic steel. Since the steel has high chromium and molybdenum content, it has good resistance points. Corrosion, crevice corrosion and uniform corrosion capabilities. The dual-phase microstructure ensures that the steel has high resistance to stress corrosion cracking and high mechanical strength.
S32750 applications and features:
S32750 duplex stainless steel pipe is used in the oil and gas industry; offshore Shipotian oil platform (heat exchange pipes, water treatment and water supply systems, fire protection systems, sprinkler systems, warm water systems; petrochemical equipment; seawater desalination (desalination) equipment (and High-pressure pipelines in equipment); mechanical and institutional components require both high strength and high corrosion resistance; combustion (exhaust gas) gas purification equipment is a steel type with good local corrosion resistance among duplex stainless steels, and is characterized by pitting corrosion resistance very good.
Chemical Composition of UNS S32750 Super Duplex Steel Pipes
| Elements | C | Cr | Cu | Fe | Mo | Mn | N | Ni | P | S | Si | W |
| Minimum | - | 24.0 | - | REMAINDER | 3.00 | - | 0.24 | 6.00 | - | - | 0.20 | 0.50 |
| Maximum | 0.030 | 26 | 0.50 | - | 5.00 | 1.20 | 0.32 | 8.00 | 0.035 | 0.020 | 0.80 | 1.00 |
Mechanical Properties of UNS S32750 Super Duplex Stainless Steel Pipes and Tubes
| 0.2% Proof Stress (N/mm2 ) [ksi] minimum | 550[79.8] |
| Ultimate Tensile Strength (N/mm2) [ksi] minimum | 800 [116] |
| Elongation (%) minimum | 25 |
| Hardness (HBN) | 270 max |
| Reduction of Cross Section Area (%) | 45 |
| Charpy V-notch Impact at ambient Temp (J) [ft.lb] | 80min [59min] |
| Charpy V-notch Impact at -46°C (J) [ft.lb] | 45av, 35min [33av, 25.8min] |
S32750 Super Duplex Steel Pipes
| Additional Testing | |
| ASTM G48A corrosion test at 40°C | No pitting and weight loss <4.0g/m2 |
| Ultrasonic Testing | According to ASTM A388 |
| Ferrite Content | 35%-55% |
| Microstructure | Microstructure certified free from grain boundary carbides, sigma, chi and laves phases |
Gnee Steel Pipe Co., Ltd. is an industrial and trading company. We mainly produce and operate carbon steel pipes and alloy steel pipes. Our pipes include stainless steel pipes, hydraulic strut pipes, and bearing pipes.
Gnee Company Team
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