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A kind of centrifugal production method of bimetal tube blank

A production method, bimetallic tube technology, applied in the field of centrifugal casting, can solve problems such as not well solved, and achieve the effects of less casting defects, good internal quality, and less inclusion content

Active Publication Date: 2019-09-17
江苏博颂能源科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Xinxing Casting Pipe Co., Ltd. started the research and development and production of bimetallic cast steel billets at the beginning of this century by using its own new technology. It is mainly used as extrusion raw material for the production of bimetallic seamless steel pipes. However, the above contradictions are still not very clear. good solution

Method used

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  • A kind of centrifugal production method of bimetal tube blank
  • A kind of centrifugal production method of bimetal tube blank
  • A kind of centrifugal production method of bimetal tube blank

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Example 1: 10# / GH600 bimetal tube blank.

[0016] In this embodiment, the centrifugally cast 10# / GH600 bimetal tube billet is the raw material tube billet for extrusion, which is used to extrude and produce high-end seamless steel pipes in the chemical industry.

[0017] The size of 10# / GH600 bimetallic tube blank is Φ346 (outer diameter)×Φ265 (middle diameter)×Φ150 (inner diameter)×800-1000mm (length), and the middle diameter is the size of the joint surface of the inner and outer layers of the bimetallic tube blank.

[0018] The pipe mold adopts DN362×2490mm, the size of the centrifugal bimetal tube blank is Φ362×Φ265×Φ205×2440mm, the thickness of the outer layer is 48.5mm, the weight of the outer layer is 910kg, the thickness of the inner layer is 30mm, and the weight of the inner layer is 420kg. See the table below for the composition requirements of the inner and outer layers.

[0019]

[0020] It can be seen that for the control of the inner layer composition,...

Embodiment 2

[0043] Example 2: 16Mn / Cr15 bimetal wear-resistant pipe.

[0044] The bimetal wear-resistant pipe is a concrete delivery pipe, the outer layer is made of 16Mn, which is required to have welding performance, the inner layer is made of Cr15, which has anti-wear performance, and the outer layer of 16Mn needs to withstand pressure, and has good safety and pressure holding performance. The total thickness of the bimetal wear-resistant pipe does not exceed 22mm, the outer layer does not exceed 13mm, and the inner layer is about 9mm.

[0045] Bimetal wear-resistant pipe size: Φ222 (outer diameter) × Φ196 (intermediate diameter) × Φ178 (inner diameter) × 2000mm (length), pipe mold specification: DN230 × 2204mm, outer metal liquid pouring weight: 145-152kg, inner layer Liquid metal pouring weight: 70-80kg.

[0046] Inner and outer layer composition requirements:

[0047] C Si mn P S Cr 16Mn 0.13-0.19 0.20-0.60 1.20-1.60 ≤0.030 ≤0.030 ≤0.30 Cr15 1.5～2...

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Abstract

The invention discloses a centrifugal production method for a double metal tube blank. The method comprises the following steps: pouring an outer molten metal and an inner molten metal from two ends of a tube mold; pouring the inner and outer molten metal with casting powder in a mixed manner; when the inner molten metal is poured, the outer temperature is at the melting temperature of the outer metal; in the pre-pouring and pouring processes of the inner and outer metal, carrying out protection through inert gas blown by a stem bar; and blowing the inert gas into the tube mold from the tube mold outlet of the stem bar, and blowing the inert gas out through baffle plate outlets distributed circumferentially from the stem bar to isolate air at a sprue gate. According to the double metal centrifugal tube blank produced by the method, the inner components are controlled well, the interface of the inner and outer layers is free of slag inclusion, metallurgical bonding is generated, the inclusion content is small, the casting defects are few, and the interior quality of the centrifugal tube is good.

Description

technical field [0001] The invention is applied to the field of centrifugal casting, and provides a method for producing bimetal tube blanks by adopting a centrifugal casting process. Background technique [0002] Bimetallic billets are usually cast by centrifugal casting. Due to the limitation of the production process, it is difficult to control the composition of the inner billet, especially for cast steel bimetallic billets, the molten metal is easy to oxidize, the pouring temperature is high, and the degree of superheat is low. There are many casting defects, large processing volume of tube billet, low metal yield and high production cost. The key is that the control of the composition of the inner layer and the quality of the interface are a pair of contradictions. If the amount of fused outer tube blank is large, the inner layer composition is not easy to control. If the amount of fused outer tube blank is small, slag inclusions will easily occur at the interface. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D13/02B22D13/10B22D19/16B22D1/00
Inventor 焦玲王冰程鹏沈美华李慧周乙中
Owner 江苏博颂能源科技有限公司