ALLOY 28 SEAMLESS WELDING PIPES & TUBES

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Alloy 28 Chemical composition (nominal) % Alloy 28 Mechanical properties Alloy 28 Physical properties Alloy 28 Corrosion resistance Alloy 28 properties Alloy 28 equivalent

Alloy 28 Forms of supply Alloy 28 Heat treatment Alloy 28 Welding Alloy 28 Fabrication Alloy 28 Applications Alloy 28 chemical composition

Alloy 28 Welding

Alloy 28 possesses good weldability. Suitable welding methods are manual metal-arc with covered electrodes and gas shielded arc welding, such as TIG and MIG. The heat input should be 1 kJ/mm maximum and the interpass temperature 150°C (300°F) maximum. A stringer bead welding technique should be used. Welding should be undertaken without preheating and, if correctly performed, there will be no need for any subsequent heat treatment. To maintain full corrosion resistance of the weld joint, welding must be followed by thorough cleaning to ensure removal of all oxides and slag particles.

In common with all austenitic stainless steels, Alloy 28 has low thermal conductivity and high thermal expansion. Welding should, therefore, be carefully planned in advance so that distortion of the welded joint can be minimized.

The welding of fully austenitic steels usually involves the risk of hot cracking in the weld metal, particularly if the weldment is under constraint. However, since Alloy 28 is an alloy with a very low impurity content, it is not particularly prone to this type of cracking.

As a filler metal for gas shielded arc welding, 27.31.4.LCu wire is recommended. For manual metal-arc welding, covered electrodes of the 27.31.4.LCuR type are recommended.

When Alloy 28 is welded to carbon steel, it is also possible to use nickel base filler metals, such as Alloy 60.

Alloy 28 (Tube and Pipe, Seamless)

Datasheet updated 2015-02-16 10:39:36 (supersedes all previous editions)

Alloy 28 is a high-alloy multi-purpose austenitic stainless steel for service in highly corrosive conditions. The grade is characterized by:

• Very high corrosion resistance in strong acids
• Very good resistance to stress corrosion cracking (SCC) and intergranular corrosion in various environments
• High resistance to pitting and crevice corrosion
• Good weldability

Standard

• UNS N08028
• ISO 4563-080-28-I
• EN number 1.4563
• EN name X 1 NiCrMoCu 31-27-4
• W.Nr. 1.4563
• DIN X 1 NiCrMoCuN 31 27 4
• SS 2584
• AFNOR Z1NCDU31-27-03

Product standards

Seamless tube and pipe:	ASTM B 668; EN 10216-5; SEW 400 (Feb 1991); SS 14 25 84; NFA 49-217
Plate, sheet and strip:	ASTM B 709, EN 10088-2; SS 14 25 84
Bar steel:	EN 10088-3; SS 14 25 84
Fittings:	ASTM A 403 (chemical composition and mechanical properties according to ASTM B668)

Approvals

Approved by the American Society of Mechanical Engineers (ASME) for use in accordance with ASME Boiler and Pressure Vessel Code, section III, section I (Code Case 1325-18) and section VIII, division 1. VdTÃœV-Werkstoffblatt 483 (Austenitischer Walz- und Schmiedestahl) NACE MR 0103 (Materials Resistant to Sulfide Stress Cracking in Corrosive Petroleum Refining Environments) NACE MR0175/ISO 15156 (sulphide stress cracking resistant material for oil field equipment) NGS 1608 (Nordic rules for application) valid for Alloy 28 made by

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