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Concrete pump pipe and method for producing metallurgy composite bimetallic concrete pump pipe by diagonal rolling technology
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A technology for compounding bimetals and producing metallurgy, applied in the direction of metal rolling, etc., can solve the problems of low binding force, inconvenient production, and low cement delivery volume.
Inactive Publication Date: 2014-09-17
XINXING DUCTILE IRON PIPES CO LTD
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[0002] The currently used concrete pump pipes mainly include single-metal concrete pump pipes and mechanical composite bimetallic concrete pump pipes. The material of the single-metal concrete pump pipes is 20Mn2 or 45Mn2. The metal concrete pump pipe includes a wear-resistant layer and a support layer. The wear-resistant layer is the inner layer, which is 65Mn or 60Mn, and the support layer is the outer layer, which is 10Mn and 20#. The cement delivery volume is about 30,000 cubic meters; the single metal composite pipe The cement delivery volume is low and the replacement is more frequent, which brings inconvenience to the production; compared with the single metal concrete pump tube, the existing mechanical composite bimetal concrete pump tube has indeed improved the delivery volume, but because the inner and outer layers are mechanically composited, The binding force is low, and as the cladding layer wears and becomes thinner, accidents such as inner layer peeling, falling off, and pipe blockage will occur
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[0036] The outer layer (base layer) is made of low-alloy high-strength steel 10Mn, and the inner layer (multilayer) is made of wear-resistant steel 9Cr2Mn, a total of two layers.
[0037] 10Mn composition (mass content): C 0.1%, Si 0.3%, Mn 1.2%, P 0.023%, S 0.01%, the rest is Fe; melting point is about 1510°C, 1783.15K.
[0038] 9Cr2Mn composition (mass content): C 1.0%, Si 0.25%, Mn 0.8%, P 0.024%, S≤0.015%, Cr 1.55%, the rest is Fe; melting point is about 1450°C, 1723.15K.
[0039] (2) Centrifugal pouring:
[0040] A. Bake the metal pipe mold to 250-260°C and then spray the paint with a thickness of 1.9mm;
[0041] B. Bake the metal pipe mold after the above-mentioned sprayed paint to 270°C;
[0042] C. Centrifugally pour 10Mn metal liquid into the metal pipe mold described in B and cool it, the pouring temperature is 1570°C, and the pouring weight is 285Kg;
[0051] The outer layer (base layer) is made of low-alloy high-strength steel 10Mn, and the inner layer (multilayer) is made of wear-resistant steel 9Cr2Mn, a total of two layers.
[0052] 10Mn composition (mass content): C 0.1%, Si 0.3%, Mn 1.2%, P 0.023%, S 0.01%, the rest is Fe; melting point is about 1510°C, 1783.15K.
[0053] 9Cr2Mn composition (mass content): C 1.0%, Si 0.25%, Mn 0.8%, P 0.024%, S≤0.015%, Cr 1.55%, the rest is Fe; melting point is about 1450°C, 1723.15K.
[0054] (2) Centrifugal pouring
[0055] A. Bake the metal pipe mold to 250-260°C and then spray the paint with a thickness of 1.9mm;
[0056] B. Bake the metal pipe mold after spraying paint to 270°C;
[0057]C. Centrifugally pour 10Mn metal liquid into the metal pipe mold described in B and cool it, the pouring temperature is 1570°C, and the pouring weight is 295Kg;
[0058] D. Carry out heat transfer numerical simulation analysis on the poured and solidified outer ...
Embodiment 3
[0067] The difference from Example 2 is that the I in the step (3) is replaced by the cold-drawn processing of the softened composite pipe obtained in the step H to obtain a cold-drawn pipe, and the size of the cold-drawn pipe is
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Abstract
The invention provides a concrete pumppipe and a method for producing a metallurgy composite bimetallic concrete pumppipe by a diagonal rolling technology, wherein the method for producing the metallurgy composite bimetallic concrete pumppipe by the diagonal rolling technology comprises the following steps of: selecting materials, centrifugally casting, diagonally rolling, mechanically machining a composite pipe obtained by means of centrifugally casting before diagonally rolling, matching the composite pipe into the size required by a diagonal rolling machine set, rolling the obtained composite pipe by a diagonal rolling machine to obtain a hot-rolled light pipe, and treating the hot-rolled light pipe by means of quenching-low-temperature tempering to obtain a finished pipe. The inner layer and the outer layer of the concrete pump pipe obtained by the invention are extremely high in shearing strength, so that the accidents such as the peeling of the inner layer, the falling off, and the blocking of a pipeline caused by attrition when the concrete pump pipe is used can be avoided.
Description
technical field [0001] The invention relates to a pipe material and a production process of the pipe material, in particular to a concrete pump pipe and a production method thereof. Background technique [0002] The currently used concrete pump pipes mainly include single-metal concrete pump pipes and mechanical composite bimetallic concrete pump pipes. The material of the single-metal concrete pump pipes is 20Mn2 or 45Mn2. The metal concrete pump pipe includes a wear-resistant layer and a support layer. The wear-resistant layer is the inner layer, which is 65Mn or 60Mn, and the support layer is the outer layer, which is 10Mn and 20#. The cement delivery volume is about 30,000 cubic meters; the single metal composite pipe The cement delivery volume is low and the replacement is more frequent, which brings inconvenience to the production; compared with the single metal concrete pump tube, the existing mechanical composite bimetal concrete pump tube has indeed improved the del...
Claims
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Application Information
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