Alleima 2RK65™ (904L)

Alleima 2RK65™ is a high-alloy austenitic stainless steel intended for use under severe corrosive conditions within the process industry. The grade is characterized by:

• Very good resistance to attacks in acidic environments, e.g. sulfuric, phosphoric and acetic acid
• Very good resistance to pitting in neutral chloride-bearing solutions
• Much better resistance to crevice corrosion than steels of the ASTM 304 and ASTM 316 types
• Very good resistance to stress corrosion cracking
• Good weldability

Standards

• ASTM: '904L'
• UNS: N08904
• ISO: 4539-089-04-I
• EN Number: 1.4539
• EN Name: X1NiCrMoCu25-20-5

Product standards

• ASTM A213 (seamless/welded tube)
• ASTM A269 (seamless/welded tube)
• ASTM A312 (seamless/welded pipe)
• ASTM A240 (plate and sheet)
• ASTM A276, A479, A484 (bar)
• ASTM B677 (seamless tube and pipe)
• EN 10216-5 (seamless tube and pipe)

Approvals

• Approved for use in ASME Boiler and Pressure Vessel Code section VIII, div. 1 construction
• VdTÜV-Werkstoffblatt 421 (Austenitischer Walz-und Schmiedestahl)