Assessment and interpretation of nonmetallic inclusions in steel

Kazakov, A. A.; Zhitenev, Andrey

doi:10.17580/cisisr.2018.02.07

Cited by 15 publications

(13 citation statements)

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“…It was previously shown [27,28], and it was confirmed in the present paper, that small indigenous nonmetallic inclusions in wheel steel are the products of deoxidation and modification, and that they are liquid at the temperatures of ladle treatment and pouring off (Fig. 3, a).…”

Section: Results Their Processing and Discussionsupporting

confidence: 86%

Extension of ASTM E2283 standard practice for the assessment of large exogenous nonmetallic inclusions in super duty steels

Kazakov¹,

Zhitenev²,

Salynova³

2019

cisisr

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Section: Results Their Processing and Discussionsupporting

confidence: 86%

Extension of ASTM E2283 standard practice for the assessment of large exogenous nonmetallic inclusions in super duty steels

Kazakov¹,

Zhitenev²,

Salynova³

2019

cisisr

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“…In a typical MAG weld, the nonmetallic inclusions primarily depend on the composition of the base and filler materials, their purity, and the shielding gas quality. If the gas protection is not disrupted, the oxide inclusions of the FeO-MnO-SiO 2 -Al 2 O 3 system are most often found in the low-alloy steel weld; the sulfide and oxosulfide inclusion presence is also possible [36,37]. Figure 4a shows the endogenous origin non-metallic inclusions distribution in the weld, and their typical compositions are presented in Table 5.…”

Section: Non-metallic Inclusions Composition and Morphologymentioning

confidence: 99%

Composition of Organosilicate Coatings High-Temperature Breakdown Products and Their Distribution in the Weld

et al. 2022

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The construction assembly and the repair of steel constructions painted with protective coatings are often carried out using arc welding. During the welding process, the coating in the weld zone is degrading. The protective coatings breakdown products are involved in the pore and non-metallic inclusion formation in the weld, the composition and distribution study of which makes it possible to analyze the reactions occurring during the welding. In this study, welding beads were deposited on the coated sheet surface by MAG welding. The distribution of inclusions (the average diameter and the relative content) along with the porosity in different bead zones were investigated by optical and scanning electron microscopy and digital image processing, and the chemical composition of inclusions was determined using energy-dispersive X-ray spectroscopy. The amount of diffusible hydrogen in the deposited metal was estimated with the vacuum method. In this work, four organosilicate coatings grades, differing in their purpose and heat resistance, were used, and their effect on the weld was studied.

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“…Steels with rather high carbon content are used for casing pipes and tubings (in comparison with gas and oil line pipes), what is explained by high requirements to their strength parameters as well as necessity to obtain rather low V т /V в relationship. It is very important to provide small axial segregation and high steel cleanness for non-metallic inclusions in manufacture of rolled products for casing pipes and tubings [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Development of rolling procedures for pipes of K55 strength class at the laboratorial mill

Adigamov¹,

Baraboshkin²,

Mishnev³

et al. 2022

cisisr

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Experimental results of physical simulation of the manufacturing technology of coiled rolled strip for pipes of K55 strength class (API SCT) at the laboratorial mill are presented. This manufacturing process includes hot rolling with accelerated cooling and coiling at high temperature. Melting of 4 laboratorial melts of K55 steel was conducted. Mechanical properties of pilot strips were examined. Investigation of microstructure via the methods of optical and scanning electronic microscopy was conducted. All samples have ferrite-pearlite microstructure which corresponded to the aimed microstructure. It was noted that molten metal without vanadium is more susceptible to forming of undesirable products of intermediate transformation stage. Recommendations on chemical composition and manufacturing technology of K55 steel on 2000 rolling mill are developed. Steel has the following aimed chemical composition for the main elements: 0.32 % C; 0.5 % Si; 1.05 % Mn; 0.05 % V. The following main technological parameters were recommended: heating up to 1240-1260 ºC; temperature after 5 th stand 1060-1100 ºC; thickness of rolled semiproduct 30-40 mm; temperature before 6 th stand 950-970 ºC; finishing rolling temperature 830-870 ºC; temperature in the 1 st coiling group 650-680 ºC; coiling temperature 620-640 ºC.

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Assessment and interpretation of nonmetallic inclusions in steel

Cited by 15 publications

References 0 publications

Extension of ASTM E2283 standard practice for the assessment of large exogenous nonmetallic inclusions in super duty steels

Extension of ASTM E2283 standard practice for the assessment of large exogenous nonmetallic inclusions in super duty steels

Composition of Organosilicate Coatings High-Temperature Breakdown Products and Their Distribution in the Weld

Development of rolling procedures for pipes of K55 strength class at the laboratorial mill

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