Okazaki Manufacturing Company
Okazaki Protection Tubes for Temperature Sensors
Manufacturer: Okazaki Manufacturing Company
Specifications
Types and Features of Metal Protection Tube Materials
| JIS code/product name in ( ) under type | Chemical composition (%) | Normal Operation Temperature Limit（℃）※1 | Features | |
|---|---|---|---|---|
| Soft steel | STPG | 0.25〜0.3C 0.3〜1.0Mn Remaining Fe | 600 | It is used for non-corrosive fluid because of its weakness in an oxidizing atmosphere. It is used after corrosion resistance increases due to surface processing with glass, resin, etc. |
| Alloy steel forged steel for high temperature/pressure containers | SFVAF22 | 2.25Cr-1Mo-Fe（c≦0.15） | 600 | Low carbon alloy steel having good corrosion resistance at a high temperature with MoCr added. Attention must be paid to the welding material at the high pressure part. |
| Austenitic stainless steel | 304SS（SUS304） | 18Cr-8Ni-Fe | 900 | Used the most widely as stainless steel. For food facilities, general chemicals facilities, atomic power, etc. |
| 304LSS（SUS304L） | 18Cr-9Ni- low C-Fe | 800 | 304 low carbon steel The one with increased grain-boundary corrosion resistance. | |
| 310S SS（SUS310S） | 25Cr-20Ni-Fe | 1000 | Excellent at oxidizing resistance, used as heat resistant steel. Weak against sulfides. | |
| 316SS（SUS316） | 18Cr-12Ni-2.5Mo-Fe | 900 | Corrosion resistance for sea water and other various media better than 304. Pitting corrosion resistant material. | |
| 321SS（SUS321） | 18Cr-9Ni-Ti-Fe | 900 | Improved grain-boundary corrosion resistance with Ti added. | |
| 347SS（SUS347） | 18Cr-9-NiNb-Fe | 900 | Improved grain-boundary corrosion resistance with Nb added. | |
| 253MA | 21Cr-11Ni-1.7Si-Fe | 1150 | Excellent corrosion resistance at high temperature. High strength at high temperature. | |
| Ferritic heat resistant steel | 4C54（SANDVIKP4）（SUH446） | 25Cr-0.2N-0.2C | 1000 | Strong against high temperature corrosion and no generation of scales easily peeled off up to 1,082℃. Excellent at sulfur resistance. |
| Corrosion/heat-resistant superalloy | INCONEL600（NCF600） | 15.5Cr-72Ni-7Fe | 1050 | Excellent iatcorrosion resistance in an oxidizing/reducing atmosphere at high temperature. Excellent at carburizing/nitriding resistance. |
| INCOLOY-800H（NCF800H） | 20.5Cr-32Ni-44.5Fe-Ti-AL-Cu | 1000 | Carburizing resistance and strong resistance against internal oxidizing. Stable austenitic organization and good corrosion resistance. Especially, 800H has excellent high temperature strength and creep rupture strength. | |
| MCALLOY | 45Cr-1Mo-Ni | 1000 | Excellent at sulfur attack resistance and vanadium attack resistance. | |
| Ni based heat/corrosion resistant alloy | HASTELLOY- C276 | 15Cr-52Ni-16Mo- 5.5Fe-4W | 1000 | Product name is HASTELLOY-C276. Excellent at corrosion resistance against acid and mixed acid in a oxidizing/reducing atmosphere. |
| HASTELLOY-X | 22Cr-48Ni-9Mo- 18Fe-1.5CO-0.6W | 1150 | Product name is HASTELLOY-X. Representative heat-resistant alloy. The strength and acid resistance are retained even at 1,090℃. | |
| Co based heat/corrosion resistant alloy | UMCO50 | 28Cr-21Fe-1Si-50Co | 1150 | Product name is UMCO50. Excellent at heat/impact resistance and for wear resistant material, sulfides and vanadium. Also excellent high temperature strength. |
| Titan | － | 0.2Fe-Ti | 250 | Excellent at corrosion resistance especially sea water resistance in a low temperature zone. |
Note
- The normal temperatures described here are the maximum temperature when mechanical strength is not required for measurement such as temperature measurement in a furnace. If strength calculation is required, adopt the maximum temperature with allowable stress specified described in the High Pressure Gas Safety Act.
- The normal use temperatures have been described referring to JIS and manufacturer’s catalog; therefore, they are not guaranteed values.
Type and Feature of Protection Tube Surface Processing (Including Cover)
| JIS code/product name in ( ) under type | Normal Operation Temperature Limit（℃）※1 | Features | |
|---|---|---|---|
| Coating | Fluoride resin (PFA) | 250 | Chemical resistance is large, and for over 150℃, resistance of FEP or more is shown. |
| Ceramic（Al2O3） | 1100 | Excellent at wear/heat/corrosion resistance. Pay attention to the thermal expansion difference from materials. | |
| Lining | Glass | 250 | STPG/SS400 used for the base. Excellent at acid resistance and poor in alkalinity. |
| Hardfacing | SF-6 （MSF Co1） | Depending on the Material | Excellent at corrosion/wear resistance. Also excellent at acid/alkali resistance. |
| Cover | Tantalum | 350 | Strong corrosion resistant against all acids. Poor against hydrofluoric acid and caustic soda. |
| Perfluoro ethylene propylene copolymer (FEP) | 150 | Having resistance in almost chemical resistance. | |
※1The temperature limit under normal operation were described referring to JIS and manufacturer’s
catalog; therefore, they are not guaranteed values.
