The Performance And Material Characteristics Of S32760 Super Duplex Stainless Steel

S32760 is a high-alloy super duplex stainless steel, mainly used in various strong corrosive environments. S32760 dual-phase steel has strong strength and corrosion resistance, and is mainly used in chemical processing, petrochemical and subsea equipment. It has strong resistance to chloride corrosion, high thermal conductivity and low thermal expansion coefficient. The high content of chromium, molybdenum and nitrogen makes it highly resistant to pitting corrosion, crevice corrosion and other corrosion. The excellent comprehensive properties of S32760 dual-phase steel are better than general dual-phase steels, such as 2205 and S31803.

S32760 dual-phase steel is resistant to various inorganic and organic acids. At the same time, the added copper element makes it have excellent resistance to non-oxidizing acid corrosion. S32760 is also resistant to strong alkali corrosion, but S32760 dual-phase steel is not suitable for long-term working temperature. Use at temperatures above 300°C, because the toughness of the material will decrease significantly above this temperature.

Corresponding grades of S32760:

1. National standard GB-T standard: digital grade: S27603, new grade: 022Cr25Ni7Mo4WCUN, old grade: one,

2. American standard: ASTMA standard: S32760, SAE standard: 1, UNS standard: F55,

3. Japanese standard JIS standard: -,

4. German standard DIN standard: 1.4501,5, European standard EN standard: X2CrNiMoWN25-7-4.

S32760 chemical composition:

⑴Carbon C: ≤0.030

⑵Silicon Si: ≤1.00

⑶Manganese Mn: ≤1.00

⑷ Phosphorus P: ≤0.030

⑸Sulfur S: ≤0.010

⑹Chromium Cr: 24.00～26.00

⑺ Nickel Ni: 6.00～8.00

⑻Molybdenum Mo: 3.00~4.00

⑼ Nitrogen N: 0.20~0.30

⑽Copper Cu: 0.50~1.00

⑾Other elements: w:0.50~1.00cr+3.3mo+16N≥40.

S32760 physical properties:

①Density density (20℃)/kg/dm3:8

②Melting point/℃:1400-1450

③Specific heat capacity (0~100℃)/kg/(kg.k): 0.46

④Thermal conductivity/w/(m.k)100℃-:-, ⑸Thermal conductivity/w/(m.k)500℃-:-,

⑥Linear expansion coefficient/(10-6/k)0~100℃:-

⑦Linear expansion coefficient/(10-6/k)0~568℃:12.8

⑧Resistivity (20℃)/(Ω.mm2/m): 90

⑨Vertical modulus of elasticity (20℃)/GPa:-

⑩Magnetism:-.

S32760 mechanical properties:

⑴Delivery status: solid solution treatment of bars, solid solution pickling of plates

⑵ Tensile strength (RM/MPa): 750

⑶ Extension strength (Rp0.2/MPa): 550

⑷ Elongation A/%: 25

⑸ Reduction of area (Z/%): -.

S32760 heat treatment:

①Hardness HBW≤: solid solution 227, hardness HRB≤: 29

② Heating temperature: 950~1100

③ Heating method: fast cooling.

S32760 super duplex stainless steel material characteristics:

1. Reliable corrosion resistance of S32760 duplex steel (pitting resistance coefficient (PREN≥40)*,

2. S32760 dual-phase steel has excellent resistance to chloride ion pitting and crevice corrosion,

3. S32760 dual-phase steel has excellent sulfuric acid resistance,

4. S32760 dual-phase steel has excellent resistance to stress corrosion cracking in a medium containing chloride ions and acid (such as hydrogen sulfide),

5. S32760 dual-phase steel is resistant to erosion corrosion and corrosion fatigue,

6. S32760 dual-phase steel has excellent mechanical properties and good weldability.

Main applications of S32760 super duplex stainless steel:

Main applications of S32760 duplex steel: neutral chloride environment, oil refining industry, petrochemical and chemical industry, chemical industry pipelines, oil and gas industry, pulp and paper industry, fertilizer industry, urea industry, phosphate fertilizer industry, seawater environment, Energy and environmental protection industry, light industry and food industry, food and pharmaceutical industry equipment, high-strength structural parts, subsea pipelines, flue gas desulphurization, osmotic desalination equipment, sulfuric acid plants, marine engineering fasteners, etc.