Seamless Duplex Stainless Steel heat exchanger u tube ASTM A789 UNS S31803 Grade 2205 OD15.88 X 2.11MM

Description:

The 2205 S.S. (UNS S31803) alloy is probably the most recognized and widely used of the many duplex stainless steels. As the name duplex implies, it has a dual phase microstructure of both austenite and ferrite. In other words, duplex alloys have the strength of ferritic (400 series) S.S. while retaining the corrosion resistance of the austenitic (300 series) S.S.

Exceptional resistance to pitting and crevice corrosion

• High resistance to stress corrosion cracking in chloride bearing Environments

• Good sulfide stress corrosion resistance

• Greater resistance to hydrogen embrittlement

• Very high mechanical strength

• High energy absorption

• Low coefficient of thermal expansion

• Good workability and weldability

Specifications:

ASTM A789 Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing for General Service

ASTM A790 (ASME SA790) Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe

ASTM A928 (ASME SA928) Standard Specification for Ferritic/Austenitic (Duplex) Stainless Steel Pipe Electric Fusion Welded with Addition of Filler Metal

Corrosion:

The duplex stainless steels have general corrosion resistance comparable Resistance to 316 S.S. and even exceed it in many applications. In addition, their particular combination of higher chromium, molybdenum and nitrogen gives the duplexes more resistance to localized forms of corrosion such as pitting, crevice and stress corrosion cracking. Since 2205 lacks the copper addition of CD4MCuN, it would not be expected to do as well as CD4MCuN in sulfuric acid.

Mechanical:

Like all duplex stainless steels, 2205 has approximately twice the yield Properties strength of 316 stainless and it is also about 50% harder. In addition, it has a slightly higher modulus of elasticity than 316 S.S. which means it is stiffer, thus less deflection can be expected.

Specifications

The 2205 alloy is available in various product forms:

Bar ASTM A276 or A479 grade S31803

Castings ASTM A890 grade 4A

Tube ASTM A789

Pipe ASTM A790

Plate ASTM A240 Werkstoff-Nr. 1.4462 DIN X 2 CrNiMoN 22 5 3

Duplex Stainless Steel Applications:

Heat exchangers

Production and processing of oil and gas

Pressure vessels – tubes for processing of chemicals

Process industries involved with handling chloride bearing solutions

Shafts, rotors and hydraulic lines

Cargo tanks - piping for chemical tankers

Oil and gas production

Petrochemical

Water desalinization

Chemical

Pulp and Paper

Marine

Power