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VDM® Alloys 600/600 H Nicrofer 7216/7216 H - 13 Pages

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Catalogue excerpts

VDM® Alloys 600/600 H Nicrofer 7216/7216 H Material Data Sheet No. 4007 March 2002 Edition

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Nicrofer 7216/7216 H are nickel-chromium-iron alloys, characterized by: • good resistance to oxidation, carburization and nitridation • good resistance to stress corrosion cracking, at both room Nicrofer 7216 H is recommended for service above 700 °C (1290 °F) because of its higher creep-rupture properties, obtained via controlled carbon content and, except for strip products, coarse grain size. and elevated temperatures • good resistance to dry chlorine and hydrogen chloride • good mechanical properties at sub-zero, room and elevated temperatures Material designation Chemical composition Table...

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Physical properties Density Melting range Thermal conductivity Specific heat Electrical resistivity Coefficient of thermal expansion between room temperature and T 103 ksi Table 3 – Typical physical properties at room and elevated temperatures.

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Mechanical properties The following properties are applicable to soft annealed Nicrofer 7216 and solution annealed Nicrofer 7216 H in the indicated product and size ranges. Specified properties of material outside these size ranges are subject to special enquiry. Strip Sheet & plate Rod & bar Tube Wire Table 4 - Minimum mechanical properties at room temperature. ISO V-notch impact toughness Nicrofer 7216 average at RT: > 150 J/cm2 transverse    Nicrofer 7216 average at RT: > 120 J/cm2 transverse Table 5 - Mechanical properties at elevated temperatures.

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Sheet cr + annealed Plate hr + annealed Grain size cold finished regular temper spring temper cold drawn cold dr. + annealed cold drawn *Elongation values for strip products are normally determined based on an initial gauge length of 50 mm (2 in.). These values are lower, dependent on the alloy, than the corresponding A5 values by an order of approx. 10 %. Table 6 – Minimum mechanical pr

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Table 7 – Long-term properties of Nicrofer 7216 H, solution annealed at 1120 °C (2050 °F). Up to approximately 700 °C (1290 °F) there is virtually no difference between the creep strengths of material in the annealed and solution-treated conditions. For applications at temperatures above 750 °C (1380 °F), the use of material in the solution-treated condition with a minimum average grain size of 65 µm/ASTM 5 is recommended. Metallurgical structure Nicrofer 7216 / 7216 H have face-centered cubic structures. Tensile strength Fig. 1 – Typical creep-rupture properties of Nicrofer 7216 H, solution annealed...

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Corrosion resistance Nicrofer 7216/7216 H are resistant to a wide range of corrosive media. Due to the chromium content the alloys possess better corrosion resistance than Nickel 99.2 (alloy 200) and LC-Nickel 99.2 (alloy 201) under oxidizing conditions. At the same time, the high nickel content results in good corrosion resistance under reducing conditions and in alkaline solutions and leads to virtual immunity to chloride-ion stress-corrosion cracking. Nicrofer 7216/7216 H show moderate resistance to mineral acids and good resistance to acetic, formic, stearic and other organic acids. Excellent...

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Descaling and pickling High-temperature alloys develop a protective oxide layer in service. Pre-oxidation in air can produce increased corrosion resistance. Therefore on the basis of the end use the necessity of descaling should be checked. Oxides of Nicrofer 7216 / 7216 H and discoloration adjacent to welds are more adherent than on stainless steels. Grinding with very fine abrasing belts or discs is recommended. Care should be taken to prevent tarnishing. Before pickling which may be performed, in a nitric/hydrofluoric acid mixture with proper control of pickling time and temperature, the surface...

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This should be allowed for by means of, among other things, wider root gaps or openings (1 - 3 mm), while larger included angles (60 - 70 °), as shown in Fig. 1, should be used for individual butt joints owing to the viscous nature of the molten weld metal and to counteract the pronounced shrinkage tendency. Striking of the arc The arc should only be struck in the weld area, e.g. on the faces to be welded or on a run-out piece. Striking marks lead to corrosion. Welding processes Nicrofer 7216/7216 H can be joined to itself and to many other metals by conventional welding processes. These include...

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Nicrofer® 7216/7216 H - alloys 600/600 H Sheet/ plate thickness mm 2)For MAG welding the use of the shielding gas Cronigon He30S or Argomag-Ni, for example, is recommended. In all gas-shielded welding operations, ensure adequate back shielding. These figures are only a guide and are intended to facilitate setting of the welding machines. Table 8 - Welding parameters (guide values). Table 9 - Heat input per unit length (guide values).

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1 other sizes subject to special enquiry Rod & bar Conditions: forged, rolled, drawn, thermally treated, oxidized, descaled or pickled, machined, peeled or ground 1) other sizes subject to special enquiry 2) depending on piece weight

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Wire Conditions: bright drawn, XA hard to hard, bright annealed or oxidized Dimensions: 0.01 - 12.0 mm (0.0004 - 0.47 in.) diameter, in coils, pay-off packs, on spools and spiders Welding filler metals Suitable welding rods, wire, strip electrodes and electrode core wire are available in all standard sizes. Seamless tube and pipe Using ThyssenKrupp VDM cast materials seamless tubes and pipes are produced and available from DMV STAINLESS Int. Sales, Tour Neptune, F-92086 Paris, La Defence Cedex (Fax: +33-1-4796 8126; Tel.: +33-1-4796 8128). Welded tube and pipe Welded tubes and pipes are obtainable...

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Imprint Date of publication March 2002, revision March 2017 Publisher VDM Metals GmbH Plettenberger Straße 2 58791 Werdohl Germany Disclaimer All information contained in this data sheet are based on the results of research and development work carried out by VDM Metals GmbH, and the data contained in the specifications and standards listed available at the time of printing. The information does not represent a guarantee of specific properties. VDM Metals reserves the right to change information without notice. All information contained in this data sheet is compiled to the best of our knowledge...

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