The main representative grade of duplex stainless steel is urea steel and S31050 stainless steel welding wire

DSS can generally be divided into four categories: UNSS32760 duplex stainless steel welding rods

Low alloy type - Representative grade: UNSS32304 duplex stainless steel welding rod (23Cr-4Ni-0.1N)

Medium alloy type - Representative grade: UNSS31803 duplex stainless steel welding rod (22Cr-5Ni-3Mo-0.1N)

High alloy type - Representative grade: UNSS32550 duplex stainless steel welding rod (22Cr-6Ni-3Mo-2Cu-0.2N)

Super duplex stainless steel type - standard grade: UNSS32750 duplex stainless steel welding rod (25Cr-7Ni-3.7Mo-0.3N)

Low alloy UNS S32304 does not contain molybdenum and can replace AISI304 or 316 in terms of stress corrosion resistance.

Medium alloy type: The corrosion resistance of UNS S31803 is between AISI316L and 6% Mo+N austenitic stainless steel. O6i4T9C

High alloy type: generally contains 25% Cr, as well as molybdenum and nitrogen, and some also contain copper walls, iron walls, and tungsten. The corrosion resistance of this type of steel is higher than that of the 22% Cr duplex stainless steel 9MS

Super duplex stainless steel type: containing high molybdenum and nitrogen, some also contain tungsten and copper, and is suitable for harsh medium conditions. It has good corrosion resistance and mechanical comprehensive performance, and can be compared with super austenitic stainless steel. US grade Z3CNUD26? 05M（CD4MCu）

Code 2605 (CD4MCu) 00Cr25Ni6Mo2Cu+N # x z8}

Mechanical properties Tensile strength σ b ≥ 700MPa Yield strength σ 0.2 ≥ 485MPa Hardness HB300

The main feature is low-carbon duplex stainless steel, which is a proprietary material introduced from the French HS company. It has high hardness, good casting performance, good mechanical and machining performance, and good welding performance.

It has good corrosion resistance and wear resistance, and has stress corrosion resistance in media containing chloride ions.

The scope and level of use are suitable for corrosive and abrasive media. Widely used in the phosphate fertilizer industry for filtration solutions, underground tanks, and sewage treatment stations. Simultaneously applicable to media below 60 ℃. At P2O5: 28-30%, H2SO4: 3-5%, CaSO4? 2H2O：3～5%， F-：1.6～2.5%， Cl-：＜800ppm，t：80～85 Under the condition of ℃ medium, the service life of the impeller shall not be less than one year, and the service life of the pump body shall not be less than one year.

This material has properties equivalent to CD4MCu and is widely used in the phosphate fertilizer industry. It is also widely used in industries such as chemical, mining, pharmaceutical, chemical fiber, papermaking, and wastewater treatment.

Other grades of duplex stainless steel: 00 Cr18Ni5Mo3Si2(3RE60、S31500)、00Cr22Ni5Mo3N (2205、S31803)、00Cr25Ni7Mo4N (2507、S32750