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API X65 tipi mikro alaşımlı çeliklerin Erdemir proses şartlarında geliştirilmesi ve üretilmesi

Development and production of API X65 type microalloyed steel at Erdemir process conditions

  1. Tez No: 127583
  2. Yazar: ÖZLEM BAYDAR
  3. Danışmanlar: PROF. DR. ŞADİ KARAGÖZ
  4. Tez Türü: Yüksek Lisans
  5. Konular: Metalurji Mühendisliği, Metallurgical Engineering
  6. Anahtar Kelimeler: Mikroalaşımlı çelikler, API X65, termomekanik haddeleme, tersinir hadde, ikincil sertleşme
  7. Yıl: 2002
  8. Dil: Türkçe
  9. Üniversite: Kocaeli Üniversitesi
  10. Enstitü: Fen Bilimleri Enstitüsü
  11. Ana Bilim Dalı: Metalurji Ana Bilim Dalı
  12. Bilim Dalı: Belirtilmemiş.
  13. Sayfa Sayısı: 94

Özet

API X65 TİPİ MIKRO ALAŞIMLI ÇELİKLERİN ERDEMİR PROSES ŞARTLARINDA GELİŞTİRİLMESİ VE ÜRETİMİ ÖZLEM BAYDAR

Özet (Çeviri)

DEVELOPMENT AND PRODUCTION OF API X65 TYPE MICRO ALLOYED STEEL AT ERDEMIR PROCESS CONDITIONS ÖZLEM BAYDAR Keywords : Microalloyed steels, API X65, thermomechanical rolling, steckel mill, secondary hardening. Abstract: As the high strength and toughness attained in microalloyed steels depend on the size and the distribution of precipitates, these steels are used especially at structural steel applications that require service under high strength and low temperature conditons, for example natural gas and oil pipe line applications. The microalloying elements Nb, Ti and V are now widely appreciated and exploited for their ability to increase the strength and toughness of structural steel. The flat products of line pipe steels, which satisfy the API standards, are not being currently produced in our country. For this aim, a cooperative study between ERDEMIR T.A.Ş., the flat products producer of our country, and the Metallurgical and Materials Engineering Department of Kocaeli University has been made. The aim of this study is to produce X65 grade microalloyed steel at Erdemir Hot Rolling Mill No.l satisfying all the conditions imposed by API standards. For the microalloyed steels to be produced satisfying the desired service toughness and strength, all processing steps must be under control. For this reason, starting from the chemical composition of the steel, necessary adjustments in the production metallurgy and the rolling process of the steel have been made while keeping in mind the feedback from the trials and the current challenges. Hence, the commercial production of API X65 grade steel has been enabled. The pipe production from the trial coils and the use of feedback from these applications have played an important role in realizing the commercial production. In addition, a study on the secondary hardening mechanism of the commercially produced X65 grade steels has been done. The aim of this study is to determine the hardening potential of the matrix in terms of carbon and the alloying elements. As a result, by implementing ERDEMIR process conditions for the production of API X65 grade microalloyed steel, the production has been enabled and the efficiency of the alloying elements has been revealed by the study on the matrix hardening potential of these steels. m

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