On Various Properties of Nodular Graphite Cast Steel

This paper describes at first the outline of the theory of high grade cast iron manufacturing that has been clarified by one of the authors through a fundamental study of the relation between cast iron and its oxygen contents. In place of the relation between the oxygen content of cast iron and its qualities, the relation between tensile strength in cast state and variation of structure was examined. A little difference in the degree of deoxidation of cast iron was indistinguishable by analysed oxygen content. To grade the qualities according to the variation of structure is the most accurate and simplest method. When nodular graphite hyper-eutectoid cast steel containing less than 1.7 per cent carbon is produced the theoretical foundation for determining carbon and silicon contents is to choose the reciprocal relation between the points on the line Eγ or in the lower areas under the line Eγ in the basic projection diagram of the Fe-C-Si system. According to this theory, an investigation of the various properties of nodular graphite hyper-eutectoid cast steel was carried out. The results obtained can be summarized as follows : (1) This cast steel does not call for so careful selection of materials, and is of higher value in mechanical properties than those of DCI, malleable iron and cast steel. (2) Since this metal has far better castability than cast steel and DCI, it is possible to manufacture castings of thin section and complicated shape. (3) Compared with gray cast iron and malleable cast iron, this cast steel is very useful for electric and magnetic material. (4) Wear resistivity of the pearlitic type of this metal is far superior to any of the ordinary cast iron, pearlitic cast iron and DCI. Wear resistivity of the ferrite type is the same as that of DCI, but it is far superior to the black heart malleable cast iron. (5) This cast steel is material that has excellent property for induction surface hardening, even in the case of ferrite type, and after heat.treatment it has the about 40～50 R_c in the surface hardness. The Jominy hardness curves of nodular graphite cast steel were measured. Compared with the pearlite type, cast steel of ferrite type has low quench-hardness bccause of its carbon concentration in austenite

Some Investigations on the Cerium-treated Cast Iron

The effects of the addition of cerium on the macro- and microstructure of hypoeutectic and eutectic cast iron have been investigated and further, some experiments, were carried out to produce the high strength and rapid-malleable cast iron containing high silicon by the addition of cerium. The results obtained were as follows : (1) With the increase of the cerium content, the structure of cast iron changed from a grey iron to a white iron passing through an inverse chilled iron. When the composition of cast iron was fixed, the amount of cerium necessary to get white cast iron from a deoxidized melt was less than that from an oxidized melt. (2) It was verified that white cast ironization with the addition of cerium was not caused by its alloying such as in the case of manganese or chromium, in which they form special carbides, but by the supercooling of melt accompanied with strong deoxidation by cerium. (3) The mechanical properties of cerium-treated rapid malleable cast iron having the high silicon contents are higher than those of the commercial black heart malleable cast iron, and by controlling the amount of cerium, carbon and silicon in cast iron, the castings of a larger section than the maximum size which has been applied to ordinary malleable cast iron can be made

Mesonephric adenocarcinoma with a sarcomatous component, a notable subtype of cervical carcinosarcoma: a case report and review of the literature

ABSTRACT: Carcinosarcoma of the uterine cervix is less common than its counterpart in the uterine corpus. On the other hand, mesonephric adenocarcinoma is also a rare neoplasm in the uterine cervix, and it has been reported that mesonephric adenocarcinomas are often accompanied by sarcomatous components. We present a case of mesonephric adenocarcinoma with a sarcomatous component which arose in a 63-year-old postmenopausal woman. The hysterectomy specimen grossly showed an exophytic mass measuring 1.8 cm in the uterine cervix. Histologically, diffuse mesonephric hyperplasia and adenocarcinoma with malignant spindle cell proliferation was recognized, and therefore the tumor was diagnosed as “mesonephric adenocarcinoma with a sarcomatous component.” The review of the literature of cervical carcinosarcoma and cervical mesonephric adenocarcinoma revealed that 16% of cervical carcinosarcoma is of mesonephric duct origin, and that mesonephric adenocarcinoma seems to be more likely to have sarcomatous change. We think the presence of a sarcomatous component in the cervical biopsy specimen could be helpful in the diagnosis of mesonephric duct origin. VIRTUAL SLIDES: The virtual slide(s) for this article can be found here: http://www.diagnosticpathology.diagnomx.eu/vs/124399650391106

Studies of the Manufacturing and Mechanical Properties of Vanadium High Grade Cast Iron

We studied on the manufacturing of vanadium high grade cast iron, in which we used the raw iron materials of blast pig iron, pig iron made of vanadium contained iron sand, steel scrap, Fe-V and vanadium contained oxidized slag. Then compared with plain high grade cast iron, we clarified the mechanical properties of this cast iron. It is much better to add in furnace than in ladle, to add vanadium to cast iron by Fe-V alloy. The addition of vanadium by oxidized slag containing vanadium is almost completely alloyed. High carbon cast iron of about 3.4% carbon has tensile strength of about 35kg/mm^2 if it contained 0.5～0.7% Vanadium

The Level and Stability of Residual Catalase in Cultured Acatalasemic Skin Fibroblasts

In an attempt to determine the level and heat stability of residual catalase in somatic cells of acatalasemic Japanese, skin fibroblasts from an acatalasemic subject were cultured, and the catalase activity of the cultured fibroblasts was compared with that of cultured normal fibroblasts. Catalase activity was determined using an oxygen electrode. The residual catalase activity in cultured acatalasemic fibroblasts was 10% of the normal. The heat stability at 55 degrees C of residual catalase in the acatalasemic fibroblasts was similar to that of normal fibroblasts

Plasma Antimicrobial Peptide LL-37 Level Is Inversely Associated with HDL Cholesterol Level in Patients with Type 2 Diabetes Mellitus

Introduction. Relation between atherosclerosis and innate immunity has attracted attention. As the antimicrobial peptide, LL-37, could have an important role in atherosclerosis, we supposed that there could be a meaningful association of plasma LL-37 level with risk factors for cardiovascular disease in subjects with type 2 diabetes mellitus. Materials and Methods. We evaluated plasma LL-37 level and other clinical markers in Japanese subjects with type 2 diabetes mellitus (n=133, 115 men and 18 women; age 64.7±11.5 years; HbA1c 8.1±1.6%). Plasma level of LL-37 was measured by ELISA. Results. Mean plasma LL-37 level was 71.2±22.3 ng/mL. Plasma LL-37 level showed significant correlations with HDL cholesterol (r=−0.450, P<0.01), triglyceride (r=0.445, P<0.01), and high sensitive C-reactive protein (r=0.316, P<0.01) but no significant correlation with age, body mass index, HbA1c, estimated glomerular filtration rate, 25-hydroxyvitamin D, or vitamin D binding protein. Multiple linear regression analysis showed significant correlations of plasma LL-37 level with HDL cholesterol (β=−0.411, P<0.01) and high sensitive C-reactive protein (β=0.193, P<0.05). Conclusion. Plasma LL-37 level was positively correlated with inflammatory markers and negatively correlated with HDL cholesterol in patients with type 2 diabetes mellitus

Plasma 25-Hydroxyvitamin D Is Independently Associated with Hemoglobin Concentration in Male Subjects with Type 2 Diabetes Mellitus

Introduction. It was reported that 25-hydroxyvitamin D level was independently associated with anemia in chronic kidney diseases, but the relation between vitamin D and anemia in diabetes mellitus is not still certain. We analyzed the relation between plasma 25-hydroxyvitamin D level and hemoglobin concentration. Materials and Methods. A cross-sectional study in male patients with type 2 diabetes was performed. Correlation coefficients and standardized partial regression coefficient for the hemoglobin concentration were evaluated. Results. Hemoglobin concentration was positively correlated with body mass index, HbA1c, estimated glomerular filtration rate, cholinesterase, and 25-hydroxyvitamin D level and negatively correlated with age, duration of diabetes mellitus, serum creatinine, and urinary albumin creatinine ratio. Multiple regression analysis revealed the independent relation of 25-hydroxyvitamin D to hemoglobin concentration. Conclusions. Plasma circulating form of vitamin D is significantly associated with hemoglobin concentration in diabetes mellitus independent of the clinical markers for kidney function or nutrition