Pyromet alloys alloy

Pyromet alloy 31 is a trademark of Carpenter Technology Corp. It is a precipitation-hardenable superalloy that exhibits corrosion resistance and... 

The austenitic iron—chromium—nickel alloys were developed in Germany around 1910 in a search for materials for use in pyrometer tubes. Further work led to the widely used versatile 18% chromium—8% nickel steels, the socaHed 18—8. 

Red Brass Alloys. In forming red brass alloys, which iaclude leaded red and leaded semired brasses, caution should be exercised to prevent gas absorption by flame impingement or the melting of oily scrap, or metal loss through excessive oxidation of the melt surface. To prevent excessive 2iac volatilization, the melt must be poured as soon as it reaches the proper temperature. The melt should be finally deoxidized and cast at ca 1065—1230°C as measured with a pyrometer. Fluxing is usually not needed if clean material has been melted. 

Sample cells were fabricated from tungsten. Additional crucibles composed of a Pt-40 w/o Rh-8 w/o W alloy were also used in experiments on the PuPt phase. Each tungsten cell was vacuum outgassed at 1800 for 1 h before an experiment. The cell temperature was determined during the measurements by sighting with a pyrometer (Pyrometer Instrument Co.) onto a blackbody hole in each cell base. The pyrometer and sight glasses were calibrated with an NBS standard lamp. 

This couple gives an e.m.f. of about - millivolt per 1° C. For high temperatures, above the melting point of constantan, Le Chatelier s pyrometer is used. It is a thermocouple consisting of pure platinum and an alloy of platinum containing 10 per cent, of rhodium. 

Pyromet . [Carpenter Tech.] Nickel-base alloy for heat shiel(Is, furnace hardware, gas turbine engine ducting, combustion liners, chemi( l plant hardware, seawater applies. 

Good resistance to melts, espec-cially acidic ones Resistant to attack by ash components and flue dust Compatible with all other materials containing alumina and silica Vessels for metallic and alloy melts (Tamman crucible), protective tubes for pyrometers. External protective tubes for pyrometers sheathing tubes for electrlc-oven heating colls... 

This paper summarizes the results of an evaluation of weldments in four candidate austenitic stainless alloys, AISI 310S, Kromarc 58, Pyromet 538, and A-286. Various combinations of welding processes, filler materials, and, in the case of Kromarc 58, pre- and postweld treatments are considered. Radiographic, metal-lographic, and fractographic examinations of all weldments were conducted. Mechanical (tensile) and fracture mechanics property data were determined with transverse weldment samples from room temperature to 4 K. 

Thermal, microstructure, and x-ray phase methods of analysis were employed. Thermal analysis was conducted with a Kurnakov pyrometer and an NTR-62 temperature recorder. The alloys studied thermographically were crushed and placed in Stepanov quartz vessels in amounts of 1.8 g. Then, the vessels were evacuated and sealed. Platinum-platinum/rhodium thermocouples were employed in the thermographic studies. 

Pet] Optical pyrometer method 1460°C / Fe alloys up to 4 mass% C and 40 mass% Si... 

The laboratory type 270 kVA DC arc furnace used in this work was graphite lined and 250 kg charge capacity. The diameter of the fiimaee was 36 cm and 90 cm depth. The voltage and current readings were measured by manually. During the taping of the alloy, temperature measurements were done by using of an optical pyrometer. 

All alloys in the system were single phase and had hep structure at room temperature. The solidus temperature for each alloy was determined in vacuum using a calibrated optical pyrometer focused on a 1 mm hole drilled to a depth of 3-4 mm in an attempt to achieve black body conditions (normally a 10 1 ratio of depth to diameter is required for black body conditions). 

The solidus and the melting points of the alloys were determined by an optical pyrometer method. The temperature for the hep bcc transformations was determined by differential thermal analysis. Some sohdus and hquidus points were also determined by this method and were in good agreement with those observed with the optical pyrometer. 

This is a low-expansion, high-strength, precipitation-hardenable superalloy. It has significant improvement in notch stress-rupture strength over pyromet CTX-1. As with alloy CTX-1, a protective coating must be applied if the alloy is to be exposed at atmospheric conditions above 1000°F (538°C). Applications include gas turbine components. It has the following chemical composition ... 

Localized overheating of a tube causes localized high-temperature creep. This leads to the plastic deformation of a tube and hence thin tube walls. Such hot spots are indicated by the color of the tube, as shown in Table 30.1. This chart is not a function of the material of the tube. Carbon steel tubes, as well as tubes of all alloys, glow with a color that corresponds only to the localized tube temperature. This is the principle of operation of the optical pyrometer, a device that is widely used in the process industry to remotely measure tube skin temperatures. 

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