2507 duplex stainless steel

Is a ferritic - austenitic (duplex) stainless steel, which combines a number of ferritic steel and austenitic steels the most useful properties, due to the chromium and molybdenum content of steel is high, it has excellent resistance to pitting, crevice corrosion and uniform corrosion. microstructure way to ensure that the steel has high resistance to stress corrosion cracking

But also high mechanical strength.

2507 stainless steel used in oil and gas industry; Dan Potian offshore oil platforms (heat exchanger tubes, water treatment and water supply systems, fire systems, sprinkler systems, and stabilize the water system; petrochemical equipment; desalination (desalination) equipment (and equipment The high-pressure pipe, water pipe); need both high strength while requiring high corrosion resistance of the mechanical and structural components; fuel (waste) gas purification equipment.

Main components: 25Cr-7Ni-4Mo-0.27N

National standards:

ASTM / ASME: A240 - UNS S32750

EURONORM: 1.4410 - X2 Cr Ni MoN 25.7.4

AFNOR: Z3 CN 25.06 Az

DIN / EN 1.4410, ASME SA-240

Corrosion resistance

1-like corrosion

SAF 2507 is a high chromium and molybdenum content to organic acids such as formic acid, acetic acid has a strong anti-corrosion ability of the whole. SAF2507 alloy of inorganic acids together, especially those containing chlorides also has a strong inorganic acid corrosion resistance.

And compared to 904L, SAF2507 mixture of dilute sulfuric acid chloride ions have a stronger anti-corrosion .904 L is the austenitic steel alloy, designed to resist pure sulfuric acid.

316L grades can not be used in hydrochloric acid, it may be subject to localized corrosion or overall corrosion. SAF2507 can be used in dilute hydrochloric acid, the damage has a strong anti-plaque and anti-crevice corrosion.

2 intergranular corrosion

nSAF 2507 low carbon content and greatly reduced during heat treatment of intergranular carbide precipitation in the risk, therefore, this alloy has a strong resistance and carbide-related intergranular corrosion.

3 stress corrosion cracking

Of SAF 2507 duplex structure with a strong resistance to stress corrosion cracking. Due to its high alloy content, SAF 2507 is corrosion resistance and strength are better than 2205.

Cracks in the building and so is almost inevitable, which makes stainless steel in chloride environment more susceptible to corrosion. SAF 2507 is highly resistant to crevice corrosion. SAF 2507 in the presence of 2000ppm chloride ions in sulfuric acid and other corrosive curve 0.1 mm / year; in hydrochloric acid and other corrosive curve 0.1 mm / year.

Mechanical properties: SAF 2507 has a high compressive strength, impact strength and low thermal expansion coefficient and high thermal conductivity of these characteristics apply to many structural components and mechanical parts. SAF 2507 high impact strength, not a prolonged period higher than 570 ° F temperature environment, this may diminish its toughness Tensile strength: σb ≥ 730Mpa; elongation: δ ≥ 20%

Supporting Welding: ER2594 welding wire, E2594 electrode

Application areas: pulp and paper industry, water desalination, gas purification, heat exchangers, chemical tankers the piping system, water system.