• 12

    2024-01

    Comparison of ductile iron and cast steel

    The strength of ductile iron is comparable to that of cast steel. Ductile cast iron has a higher yield strength of 40k compared to cast steel's 36 In most municipal applications, such as water, salt water, steam, etc., the corrosion and oxidation resistance of ductile cast iron exceeds that of cast steel.

    2024-01-12

    12

    2024-01

    Comparison of ductile cast iron and cast iron (gray cast iron)

    Comparison of ductile cast iron and cast iron (gray cast iron)

    2024-01-12

    12

    2024-01

    What are the specifications of ductile iron pipe?

    The main components of ductile iron pipe are carbon, silicon, manganese, sulfur, phosphorus and magnesium. In the ferrite and pearlite matrix on the distribution of a certain number of spherical graphite, according to the nominal caliber and the different requirements of the elongation, the matrix organization of ferrite and pearlite proportion is different, the proportion of pearlite is generally not more than 20%, large caliber is generally controlled at about 25%. Small tensile strength:420/Mpa, small yield strength 300/Mpa, small elongation 7%.

    2024-01-12

    01

    2023-03

    Roll fatigue rupture preventive measures - Roll management and maintenance use

    (1) The residual stress on the surface of the rolls after grinding cannot be completely eliminated, so it is necessary to determine the hardness value before and after grinding of each pair of rolls to do long-term tracking and master the performance status of the rolls. This is conducive to the timely revision of a reasonable grinding process. In addition, the normal rolling rolls unloaded from the mill, the main operator of the mill should be in the roll change single fill in the rolling time, rolling tonnage, the reason for changing the rolls, etc., the mill can make appropriate adjustments to the amount of grinding through the use of the situation. In order to make the natural elimination of stress, the roll must be naturally cooled to 25 ℃ ~ 30 ℃ before regrinding. The complete process data should be recorded for each regrinding of the roll.

    2023-03-01

    01

    2023-03

    Application of Simulation Technology in Roll Development

    Simulation application is aimed at improving process technology methods, improve product quality, master the process of cold roll forming, reduce the roll repair and modify the design, save production commissioning costs. Cold roll forming process simulation is inseparable from the experience of roll designers and molding equipment installation and commissioning process.

    2023-03-01

    01

    2023-03

    Roll surface curve of rolls

    An improved roll cooling, roll seam lubrication device, an improved roll cooling, roll seam lubrication device, belongs to the technical field of rolling mill. Used to solve the existing device exists in the lubricant film is not uniform, easy to mix into the residual cooling water and other defects. Composition is located in the roll seam entrance on the upper and lower cut water plate,

    2023-03-01

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