STAINLESS STEEL TUBE & PIPE   

Hastelloy B3 2.4600 UNS N10675 is a nickel-molybdenum alloy with excellent resistance to pitting, corrosion, and stress corrosion cracking plus, thermal stability superior to that of alloy B2. In addition, this nickel steel alloy has great resistance to knife-line and heat-affected zone attack. Alloy B3 also withstands sulfuric, acetic, formic and phosphoric acids, and other non-oxidizing media. Excellent resistance to hydrochloric acid at all concentrations and temperatures.

Hastelloy Alloy B3 2.4600 has poor corrosion resistance to oxidizing environments, therefore, it is not recommended for use in oxidizing media or in the presence of ferric or cupric salts because they may cause rapid premature corrosion failure. B3 alloy with outstanding resistance to hydrochloric and sulfuric acids in the as welded condition and excellent thermal stability.

Hastelloy B-3 2.4600 alloy is an additional member of the nickel-molybdenum family of alloys with excellent resistance to hydrochloric acid at all concentrations and temperature. It also withstands sulfuric acid, acetic acid, formic acid and phosphoric acids, and other nonoxidizing media. B-3 alloy has a special chemistry designed to achieve a level of thermal stability greatly superior to that of its predecessors, e.g. Hastelloy B-2 alloy. B-3 alloy has excellent resistance to pitting corrosion, to stress-corrosion cracking and to knife-line and heat-affected zone attack.



Characteristics of Hastelloy B3 2.4600 :
Maintains excellent ductility during transient exposures to intermediate temperatures;
Excellent resistance to pitting corrosion and stress-corrosion cracking;
Excellent resistance to knife-line and heat-affected zone attack;
Excellent resistance to acetic, formic and phosphoric acids and other non-oxidizing media;
Resistance to hydrochloric acid at all concentrations and temperatures;
Thermal stability superior to alloy B2.

Limiting Factors of Hastelloy B-3 2.4600
Alloy B-3 has poor corrosion resistance to oxidizing environments, therefore, it is not recommended for use in oxidizing media or in the presence of ferric or cupric salts because they may cause rapid premature corrosion failure. These salts may develop when hydrochloric acid comes in contact with iron and copper. Therefore, if this nickel steel alloy is used in conjunction with iron or copper piping in a system containing hydrochloric acid, the presence of these salts could cause the alloy to fail prematurely.

Fabrication with Hastelloy B-3
Problems associated with fabrication of alloy B-2 components should be minimized with alloy B-3 due to its improved thermal stability. A low carbon content permits alloy B-3 to be used in the as-welded condition. Hastelloy B-3 has good overall forming and welding characteristics. This alloy can be forged or otherwise hot-worked, providing that it is held at 2250° F for a sufficient amount of time to bring the entire piece to temperature. Since it is a low carbon alloy, the use of lower hot finishing temperatures may be necessary to achieve grain size control. It may also be formed by cold working. Although it does work-harden somewhat rapidly, B-3 alloy components can be made using all common cold forming techniques. All common welding techniques may be used with alloy B-3, however, oxyacetylene and submerged arc welding processes are not recommended when the fabricated item is to be used in corrosive service.



Hastelloy B-3 Corrosion Diagrams.


Heat Treatment
All wrought forms of Hastelloy B-3 alloy are furnished in the solution heat-treated condition unless otherwise specified. B-3 alloy is solution heat-treated at 1950°F (1065°C) and rapid quenched, except for bright annealed sheet or coil products which are heat-treated at 2100°F (1150°C) and cooled in hydrogen.

Available in Wrought Form
Hastelloy B-3 alloy is available in the form of plate, sheet, strip, billet, bar, wire, pipe and tubing.

Applications
Hastelloy B-3 alloy is suitable for use in all applications previously requiring the use of Hastelloy B-2 alloy. Like B-2 alloy, B-3 is not recommended for use in the presence of ferric or cupric salts as these salts may cause rapid corrosion failure. Ferric or cupric salts may develop when hydrochloric acid comes in contact with iron or copper.

Hastelloy B-3 alloy is covered under U.S. Patent 6,503,345 B1, in Europe under EP 0 628 088 B1 as well as under a number of patents in other countries around the world.

Specifications
Hastelloy B-3 alloy (UNS N10675) is covered by ASME Section VIII, Division 1. The alloy is covered under ASTM specifications B 333 (plate, sheet, and strip), B 335 (bar), B 366 (welded pipe), B 622 (seamless pipe and tubing), and B 626 (welded tubing). The DIN specification is 17744 No. 2.4600 (all forms), TUV Werkstoffblatt 517 (all forms).