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FORGE -DS
ETERNAL
A duplex stainless steel bushing is a mechanical component crafted from duplex stainless steel, which combines the benefits of both austenitic and ferritic stainless steels, making it widely utilized in the industrial sector. Common duplex stainless steel grades include S31803, S32205, S32750, and so on.
F53/S32750 Production Procedure
F53/S32750 Chemical Composition
| C | Si | Mn | Cr | Mo | N | Ni | Cu | P | S |
| ≤0.03% | ≤0.8% | ≤1.2% | 24-26% | 3-5% | 0.24-0.32% | 6-8% | ≤0.5% | ≤0.035% | ≤0.02% |
Mechanical Property
The core mechanical properties of S32750 duplex stainless steel bushings are characterized by high strength and high toughness.
Strong and balanced: It combines the high strength of ferritic stainless steel with the excellent toughness of austenitic stainless steel, avoiding the performance shortcomings of single-phase stainless steel.
Good stability: Within the operating temperature range of -20℃ to 300℃, the mechanical properties exhibit minimal fluctuation and can maintain stability over a long period of time.
Fatigue resistance: Excellent resistance to corrosion fatigue and stress fatigue, suitable for cyclic load conditions.
Core mechanical performance parameters (in solution annealed state):
Tensile strength: ≥750MPa, significantly higher than ordinary stainless steel, with stronger load-bearing capacity.
Yield strength: ≥550MPa, excellent resistance to deformation, suitable for high-pressure conditions.
Elongation: ≥25%, good toughness, capable of withstanding certain impacts and deformations.
Hardness: HB≤290 (or HRC≤30), combining strength and machinability.
Impact energy: ≥47J (at -20℃), excellent low-temperature toughness, strong impact resistance.
The processing and welding of S32750 require special attention to the following points:
Heat treatment: The solution treatment temperature is 1020-1100 ℃, and rapid water quenching is used to optimize the biphasic ratio; After forging, it is necessary to immediately cool it with water to avoid the precipitation of brittle phases
Welding: It is recommended to use ER2594 or ERNiCrMo-3 welding materials with interlayer temperature ≤ 100 ℃. No heat treatment is required after welding, but carbon steel contamination should be avoided
Forming processing: The forging temperature is 1000-1180 ℃, and the final forging temperature needs to be controlled between 800-900 ℃
F53/S32750 Bush Application
Marine engineering: It can be used in seawater desalination equipment, pipeline systems for offshore platforms, etc., and is resistant to corrosion from chlorides in seawater.
Oil and gas industry: It is suitable for pipelines, valves, etc. in acidic oil and gas wells containing hydrogen sulfide, carbon dioxide, and chloride, as well as subsea oil and gas transmission pipelines.
Chemical industry: It can be used for reactors, storage tanks, and pipelines in the production of sulfuric acid, hydrochloric acid, and other chemical equipment. It is also widely used in chemical processes involving chlorides.
Energy industry: It is commonly used in pipelines and heat exchangers for flue gas desulfurization systems, as well as corrosion-resistant heat exchangers and pipeline systems in nuclear power and traditional power plants.
Main equipment
2000 tons fast forging press production line
High temperature（upto1200℃）heating furnace
Heat treatment pool
Machining capability
