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Centrifugal production method of thin-walled bimetallic tube

A bimetallic pipe and production method technology, applied in the field of centrifugal casting, can solve problems such as difficult control of inner layer composition, many casting defects, narrow range of process parameters, etc., and achieve good control of inner layer composition, less inclusion content, and casting defects little effect

Active Publication Date: 2020-09-04
ZUORAN JINGJIANG EQUIP MFG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] This kind of thin-walled bimetallic centrifuge tube is produced by centrifugal casting process, but due to the thin wall of the tube blank, the solidification speed of molten metal is fast, there are many casting defects, and the range of process parameters is very narrow, and the inner layer composition is not easy to control. Difficulty producing high-quality products

Method used

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  • Centrifugal production method of thin-walled bimetallic tube
  • Centrifugal production method of thin-walled bimetallic tube

Examples

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Effect test

Embodiment 1

[0012] Example 1: 304L / SA210 bimetallic centrifuge tube.

[0013] In this embodiment, the centrifugally cast 304L / SA210 bimetallic centrifugal tube is a hot-rolled raw material tube, which is used for hot-rolled production of 304L / SA210 bimetallic seamless steel pipe.

[0014] The size of 304L / SA210 bimetallic centrifuge tube is Φ178 (outer diameter) × Φ158 (inner diameter) × 3000-4000 (length) mm, and the middle diameter of the joint surface of the inner and outer layers is Φ173mm.

[0015] Before hot rolling, the inner and outer surfaces need to be processed to remove the casting defects in the bimetallic centrifugal tube. The size of the centrifugal bimetallic tube blank is Φ186×Φ150×3600mm, the thickness of the outer layer is 6.5mm, the weight of the outer layer is 103kg, and the thickness of the inner layer is . 11.5mm, the inner pouring weight is 165kg. See the table below for the composition requirements of the inner and outer layers.

[0016] material C ...

Embodiment 2

[0044] Example 2: high chromium cast iron / 16Mn bimetal wear-resistant roller.

[0045] The outer layer of the bimetallic wear-resistant roller is made of high chromium cast iron, making full use of its good wear resistance, and the inner layer of 16Mn is made of its good welding performance, which is convenient for the assembly of the wear-resistant roller.

[0046] Bimetal wear-resistant roller size: Φ246 (outer diameter) × Φ226 (intermediate diameter) × Φ206 (inner diameter) × 2245 (length) mm, the outer pouring weight is about 130kg, and the inner pouring weight is about 120kg.

[0047] Inner and outer layer composition requirements:

[0048] material C Si mn P S Cr High chromium cast iron 2.3～3.0 ≤1.0 0.5-1.5 ≤0.035 ≤0.030 23.0-28.0 16Mn 0.13-0.19 0.20-0.60 1.20-1.60 ≤0.030 ≤0.030 ≤0.30

[0049] From the comparison of the inner and outer layer components in the above table, it can be seen that after fusion, the control of Si, Mn...

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Abstract

The invention discloses a centrifugal production method for a thin-wall bimetal tube. An outer layer metal solution and an inner layer metal solution are rapidly poured from the two ends of a tube mold; the outer layer metal solution is poured in a mixed mode by adopting low-melting-point casting powder; when the inner layer metal solution is poured, the temperature of the outer layer is lower than the melting point of 30-100 DEG C; before and when the inner and outer layer metal solutions are poured, inertia gas fed by a stem bar is adopted for protection; when the outer layer metal solutionis poured, the rotating speed of the tube mold is not lower than 100 G. According to the thin-wall bimetal centrifugal tube manufactured through the method, the inner layer content is well controlled,no slag inclusion exists at an interface between the inner and outer layers, metallurgy combination is generated, the internal quality of the centrifugal tube is good, the inclusion content is low, and few casting defects are caused.

Description

technical field [0001] The invention is applied to the field of centrifugal casting and provides a method for producing thin-walled bimetallic pipes by adopting centrifugal casting. Background technique [0002] Thin-walled bimetallic tubes refer to bimetallic tubes whose ratio of the thickness of the outer layer or inner layer to the pipe diameter is less than 0.1. Thin-walled bimetallic tubes have many uses. Layer materials are different. A raw material tube billet for subsequent thermal processing, such as thin-walled 304L / SA210 bimetallic centrifuge tube, with a total thickness of about 20mm. It is mainly used for hot rolling to produce bimetallic boiler tubes for black liquor boilers. The outer layer is made of 304L. To prevent the corrosion of black liquor, the inner layer SA210 is conducive to improving the heat transfer efficiency of the boiler tube. One is to use the cast pipe directly, such as 16Mn / Cr15 bimetallic thin-walled wear-resistant pipe with a total thic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D13/02B22D19/16
CPCB22D13/02B22D19/16
Inventor 程鹏李栋王冰杨志费中华毛凯田焦玲
Owner ZUORAN JINGJIANG EQUIP MFG