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■■■■■■■■■■■■■■■■■■■ 川崎製鉄技報 KAWASAKI STEEL GIHO Vol.6 (1974) No.2 ■■■■■■■■■■■■■■■■■■■ |
| 直接脱硫装置用ASTM A 387 Gr. D極厚鋼板の製造 Performance of ASTM A 387 Gr. D Heavy Plates for Fuel Oil Desulphurizing Reactor, Especially for Direct Desulphurization 佐々木 健二(Kenji Sasaki) 小桜 芳郎(Yoshiro Kozakura) 関根 稔弘(Toshihiro Sekine) 楠原 祐司(Yuji Kusuhara) |
| 要旨 : 近年になり直接脱硫装置用A387 Gr. D極厚鋼板の需要が増加し，当社においてもASEA-SKF方式（Ladle Refining Furnace）による溶製法でその製造を行なっている。製作経過は，きわめて順調で，その中には，板厚268mmの超極厚大単重鋼板が含まれているが，180mm〜200mm厚の極厚鋼板の品質特性と比較し，板厚中心部においても，内部性状，常温強度，高温強度および低温靱性などいずれをとってもまったく遜色ない良好な結果が得られている。 |
| Synopsis : In recent years the demand for fuel oil desulphurizing reactors has unexpectedly increased, bringing about a tendency to substituting ultraheavy steel plates for forged rings as for the steel grades of ASTM A 387 D. A direct desulphurizing reactor came into service just recently in an oil refinery, using 185mm thick heavy plates of A 387 D with remarkable performance, delivered by Mizushima Works, Kawasaki Steel Corporation. At present, a large quantity of heavy plates A 387 D of from 131 up to 268mm thickness is produced in Mizushima and the mechanical properties are entirely of satisfaction even in the case of ultraheavy a 387 D plates of 268 mm thickness, in spite of more severer heat treating conditions; namely slower quenching rate and higher value of tempering parameter of 20.6×10 3. For instance, the tensile strength even at the center of through-thickness is around 58 and 47 kg/mm2 at room temperature and elevated temperature of 432℃, respectively, and Charpy impact values are higher than 20 kg·m at 10℃. Besides, the difference of the mechanical properties between at quarter and center through-thickness is very small. Internal and external qualities of the plates are also very satisfactory. |
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