Chemical composition The main alloying elements of duplex steel are Cr, Ni, Mo and N. Among them, Cr and Mo are used to increase the ferrite content, while Ni and N are austenite stabilizing elements. Guon stielengraden hawwe ek eleminten lykas MN, Cu, en W. Cr, NI, en Mo kin Corroson-ferset ferbetterje. It ferset tsjin it pitting en crevice-korrosie is benammen goed yn chloride-befette omjouwings.

Foardielen fan Duplex Stainless Steel

1. Yn ferliking mei Austenityske roestfrij stiel

2) It has excellent resistance to stress corrosion cracking, especially in environments containing chloride ions. Even duplex stainless steel with the lowest alloy content has higher resistance to stress corrosion cracking than austenitic stainless steel. Stress corrosion is a prominent problem that ordinary austenitic stainless steel is difficult to solve. 3) The corrosion resistance of the most common 2205 duplex stainless steel used in many media is better than that of ordinary 316L austenitic stainless steel, and super duplex stainless steel has extremely high corrosion resistance. In some media, such as acetic acid and formic acid, it can even replace high-alloy austenitic stainless steel and even corrosion-resistant alloys. 4) It hat goede lokaal Corrosion ferset. Compared with austenitic stainless steel with the same alloy content, its wear corrosion resistance and corrosion fatigue resistance are better than austenitic stainless steel. 5) The linear expansion coefficient is lower than that of austenitic stainless steel, close to that of carbon steel, suitable for connection with carbon steel, and has important engineering significance, such as the production of composite plates or linings.

2. Yn ferliking mei Ferrityske rostfrij stiel, de foardielen fan Duplex Stainless Steel binne as folgjend:

1) De wiidweidige meganyske eigenskippen binne heger dan dy fan Ferrityske roestfrij stiel, foaral plestik taaiens. It is net sa gefoelich foar brittless as ferrityske rostfrij stiel.

2) Utsein foar resinsjes fan stress Corroson, is oare lokale korroenresistinsje better dan Ferrityske rustfrij stiel.

3) Kâlde ferwurkingspereferprestaasje en kâld foarmjende prestaasjes binne folle better dan Ferrityske rostfrij stiel.

4) De weldingprestaasjes is folle better dan ferrityske rostfrij stiel. Yn 't algemien is gjin foarútgong ferplicht foardat jo welding en gjin hjittensbehandeling is nedich nei welding.

5) It oanfraachberik is breder dan dy fan Ferrityske roestfrij stiel.

Oanfraach

Fanwegen de hege krêft fan Duplex stiel, kin it faaks materialen opslaan, lykas ferminderjen fan 'e muorre dikte fan' e piip. Take SAF2205 and SAF2507W as examples. SAF2205 is suitable for use in chlorine-containing environments. This material is suitable for oil refining or other process media mixed with chlorides. SAF2205 is particularly suitable for heat exchangers that use chlorine-containing aqueous solutions or slightly salty water as cooling media. This material is also suitable for diluted sulfuric acid solutions and pure organic acids and their mixtures. For example: oil pipes in the oil and gas industry: crude oil desalination in refineries, sulfur-containing gas purification, wastewater treatment equipment; cooling systems using slightly salty water or chlorine-containing solutions.