Views: 5 Author: Wang Publish Time: 2024-10-10 Origin: Site
Alloy S32750 is a super duplex stainless steel supplied in the solution annealed condition. As a super duplex stainless steel, it combines the desirable aspects of both austenitic and ferritic grades. The higher chromium, molybdenum and nitrogen contents result in a Pitting Resistance Equivalent number (PREN) of >41, providing pitting and crevice corrosion resistance superior to austenitic and duplex stainless steels in almost all corrosive media, and a Critical Pitting Temperature exceeding 50°C.
S32750 is a super duplex grade, combining high strength with exceptional corrosion resistance. Like other duplex grades the super duplex grades are not suitable for high or low temperature service. Supplied in the annealed condition, it achieves yield strengths of 80ksi (550Mpa), greater than most austenitic and duplex stainless steel grades. It cannot be hardened by heat treatment but can be strengthened by cold working. It also exhibits a low coefficient of thermal expansion and higher heat conductivity than austenitic steels and is suitable for working temperatures up to 300°C. Alloy 32750 is listed in NACE MR 0175 for sour service and having gained ASME Approval for Pressure Vessel applications it can be used in a wide variety of applications.
Alloy 2507 has 25% chromium, 4% molybdenum, and 7% nickel. This high molybdenum, chromium and nitrogen content results in excellent resistance to chloride pitting and crevice corrosion attack and the duplex structure provides 2507 with exceptional resistance to chloride stress corrosion cracking. Usage of Duplex 2507 should be limited to applications below 600° F (316° C). Extended elevated temperature exposure can reduce both the toughness and corrosion resistance of alloy 2507. Duplex 2507 possesses excellent mechanical properties. Often a light gauge of 2507 material can be used to achieve the same design strength of a thicker nickel alloy. The resulting savings in weight can dramatically reduce the overall cost of fabrication.
The chemical composition of stainless steel grade Super Duplex 2507 is outlined in the following table.
Element | Content (%) |
Chromium, Cr | 24 – 26 |
Nickel, Ni | 6 – 8 |
Molybdenum, Mo | 3 – 5 |
Manganese, Mn | 1.20 max |
Silicon, Si | 0.80 max |
Copper, Cu | 0.50 max |
Nitrogen, N | 0.24 – 0.32 |
Phosphorous, P | 0.035 max |
Carbon, C | 0.030 max |
Sulfur, S | 0.020 max |
Iron, Fe | Balance |
2507 Duplex Steel is well-known for its exceptional resistance to corrosion and pitting. With its unique composition of 25% chromium, 4% molybdenum, and 7% nickel, Super Duplex 2507 is a highly durable material that offers superior protection against harsh, corrosive environments.
One of the key factors contributing to Super Duplex 2507’s corrosion resistance is its duplex structure. This structure provides the material with enhanced resistance to chloride stress corrosion cracking, making it ideal for use in harsh chemical environments.
In addition, the high molybdenum and chromium content of Super Duplex 2507 gives it excellent resistance to pitting and crevice corrosion. This makes it an ideal choice for use in applications where it will be exposed to corrosive liquids, such as the chemical processing industry. 2507 duplex’s resistance to corrosion is further enhanced by its high resistance to stress corrosion cracking. This makes it an excellent choice for use in high-pressure, high-temperature environments, such as the oil and gas industry.
2507 Duplex is a highly versatile material that can be easily fabricated to meet the demands of a wide range of applications. With its high strength and toughness, Super Duplex 2507 is well-suited for use in demanding industrial and commercial environments.
When fabricating Super Duplex 2507, it is important to consider the material’s high thermal conductivity and tendency to work harden. These factors can make it challenging to form and shape the material, so it is important to use appropriate fabrication techniques and equipment. Super Duplex 2507 can be easily machined using standard metalworking tools and techniques. However, due to its high hardness, care must be taken to ensure that the cutting edges are sharp and that cutting speeds are kept low.
Welding is another important aspect of Super Duplex 2507 fabrication. The material can be easily welded using standard welding techniques, but it is important to carefully control the welding process to prevent cracking. Preheating the material prior to welding can help to reduce the risk of cracking.
Heat treatment is another important aspect of Super Duplex 2507 fabrication. The material is highly heat-resistant, but extended exposure to elevated temperatures can reduce both its toughness and corrosion resistance. It is important to carefully control the heat treatment process to ensure that the material’s mechanical properties are not degraded.
Super Duplex Steel S32750 (also known as Duplex Stainless Steel 2507 or Duplex Steel 2507), is a high-performance duplex alloy that offers exceptional strength and corrosion resistance. With its unique combination of 25% chromium, 4% molybdenum, and 7% nickel, Super Duplex 2507 is a versatile material that has a wide range of industrial and commercial applications.
The oil and gas industry is one of the largest users of Super Duplex 2507, as it is ideal for use in offshore drilling rigs, pipelines, and storage tanks. The high resistance to corrosion and pitting makes it ideal for use in harsh, corrosive environments.
Super Duplex 2507 is also used in the chemical processing industry, where it is frequently used for heat exchangers, tanks, and piping systems. The material’s high resistance to stress corrosion cracking makes it ideal for use in chemical plants, where it is often exposed to harsh chemicals.
In the paper and pulp industry, Super Duplex 2507 is often used for pumps, valves, and other components that require strength and durability. It is also used in the pharmaceutical industry for its excellent resistance to corrosion and its non-toxic properties.
The marine industry also benefits from Super Duplex 2507, as it is used in the construction of ships, offshore platforms, and other marine structures. The material’s exceptional resistance to corrosion and pitting makes it ideal for use in saltwater environments.