SUPER DUPLEX 2507 STAINLESS STEEL PIPE BRIEF INTRODUCTION

SUPER DUPLEX 2507 STAINLESS STEEL PIPE is a ferritic-austenitic (biphasic) stainless steel that combines the most beneficial properties of many ferritic and austenitic steels because of their high levels of chromium and molybdenum The ability to resist pitting corrosion, crevice corrosion and uniform corrosion.The biphasic microstructure ensures that the steel has a high resistance to stress corrosion cracking, and the mechanical strength is also high.
Typical 2507 Duplex Stainless Steel Microstructure

2507 stainless steel used in the oil and gas industry; offshore stone breaking oil platform (heat exchanger tubes, water treatment and water supply systems, fire protection systems, water systems, water stabilization systems; petrochemical equipment; desalination (desalination) equipment High-pressure pipe, sea water pipe); both high strength and high corrosion resistance of the mechanical and structural components; combustion (waste) gas purification equipment. Main components: 25Cr-7Ni-4Mo-0.27N

SUPER DUPLEX 2507 STAINLESS STEEL PIPE CORROSION RESISTANCE
1. Usual Corrosive
The higher chromium and molybdenum content of SAF 2507 has a strong resistance to overall corrosion of organic acids such as formic acid, acetic acid, etc. The SAF2507 alloy has a strong resistance to inorganic acids, especially those containing chloride The corrosion resistance.
Compared to 904L, SAF2507 has a stronger corrosion resistance to diluted sulfuric acid ions. 904L is an austenitic alloy that is designed to withstand pure sulfuric acid corrosion.
316L grade can not be used in hydrochloric acid environment, it may be subject to local corrosion or corrosion.

SAF2507 can be used for dilution of hydrochloric acid environment, has a strong anti-stain and anti-fissure corrosion ability.
2. intergranular corrosion
The lower carbon content of the nSAF 2507 greatly reduces the risk of carbide precipitation in the intergranular phase during heat treatment, and therefore the alloy has a strong ability to resist intergranular corrosion associated with carbides.
3. Stress corrosion cracking
The compound structure of SAF 2507 has a strong resistance to stress corrosion cracking. Due to its high alloy content, SAF 2507 has better corrosion resistance and strength than 2205.
Cracks in the construction and other aspects is almost inevitable, which makes the stainless steel in the chloride environment more susceptible to corrosion.

SAF 2507 has a strong ability to crack corrosion resistance. SAF 2507 containing 2000ppm chloride ion in the sulfuric acid corrosion curve 0.1 mm / year; Corrosion curve in hydrochloric acid 0.1 mm / year.

Mechanical properties: SAF 2507 has a high compressive strength, impact strength and low coefficient of thermal expansion and high thermal conductivity. These features apply to many structural parts and mechanical parts. SAF 2507 impact strength is high, not long-term placed Higher than 570 ° F in the temperature environment, this may weaken its toughness. Tensile strength: σb ≥ 730Mpa; Elongation: δ ≥ 20%
Supporting welding consumables: ER2594 welding wire, E2594 electrode
Applications: pulp and paper industry, desalination, flue gas purification, heat exchangers, chemical tanker piping systems, seawater systems.