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General Guidelines For Protecting Sheath For Different Applications Are Given In The Table Below:
| Protecting Sheath | Composition (Approx.) | Application Guidelines | Standard Sheath Dis. (Wall Thickness), mm |
| Mild Steel | Carbon Steel | For use upto 550°C in non-oxidizing environments main area of usage include non-corrosive liquids and gases. Melting point 1525°C. | 21.3/22 (2) |
| Stainless Steel 304 | 18-20% Cr. 8-11% Ni., <2% Mn balance Iron | Upto 900°C in oxidizing conditions. Has good resistance to oxidation and corrosion. Generally used in process applications such as steam lines, oil refineries and chemical solutions. Resists nitric acids well, halogen acids poorly and the sulphur acids moderately. Subject to carbide precipitation in the 480-870°C range. Not recommended for use in reducing atmospheres. Melting Point 1400°C | 21.3/22 (2) 18 (2) 16 (1.6), 14 (1.6) 12.7/12 (1.6) |
| Stainless Steel 315 | 16-18% Cr, 10-14% Ni, 2-3% Mo, balance Iron | For use upto 900°C in oxidising conditions. Superior to SS304 in corrosion resistance. Resists pitting in phosphorous & acetic acids. Subject to carbide precipitation in the 430-815°C range. Not recommended for use in reducing atmospheres. Melting point 1400°C | |
| Heat Resistance Steel 446 | 23-27% Cr, balance Iron | Upto 1100°C in oxidizing conditions. Excellent resistance to oxidizing & reducing flames containing sulphur. For sulphurous atmosphere salt baths & molten metal. Melting 1400°C. | 21.3/22 (2) |
| Stainless Steel 310 | 24-26% Cr,19-22% Ni, <2% Mn., balance Iron | Upto 1100°C High resistance to corrosive & nitrogenous atmosphere. Provides goods resistance to both carburizing & reducing environments. Deficient in oxygen. Subject to carbide precipitation in the 490-870° range. Suitable for carburizing, annealing/ hardening furnaces, cyanide & salt bath. Melting point 1410°C. | 21.3/22 (2) |
| Inconel 600 | 72%(min.) Ni, 14-17% Cr. balance Iron. | Upto 1150°C under oxidizing conditions, goods resistance in corrosive atmosphere at high temp. not recommended for use in sulphur or reducing atmospheres. Suitable for carburizing. Annealing and hardening furnaces, cyanide salt bath etc. | 21.3/22 (2) |
| Incolloy 800 | 30-35% Ni,19-23% Cr balance Iron | Upto 650°C in sulphur corrosive & reducing atmosphere, 950°C in sulphur corrosive & oxidizing atmosphere & 1150°C in air, strong resistance to oxidation & carburizing at high temperature Resists sulphur attack, internal oxidation and scaling. Melting point 1370°C. | 21.3/22 (2/3.77) |
| Wrought Iron | Technically Pure Iron | Upto 600°C in air. Can be used for metal melts especially HSS baths upto 1350°C when with exchangeable sleeve. | 24 (2.5), 15 (2) |
| Impervious Ceramic | Alumina Silicate (sillimanite) | Upto 1500°C. Fair resistance to thermal stock and fair mechanical strength. | 24 (2.5), 15 (2) |
| Sintered Alumina | Pure Alumina | Upto 1800°C. Nonporous with goods resistance to thermal & mechanical shock. | 24 (2.5), 15 (2) |
| Silicon Carbide | 90% Sic | Upto 1650°C. Can withstand flame impingement, has fair thermal stock resistance. | 45 (10), 26 (8) |
Toshniwal Industries Pvt. Ltd. (Toshniwal Industries Pvt. Ltd.)
Industrial Estate, Makhupura, Ajmer, Rajasthan - 305002
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