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Manufacturing method for oblique rolling of bimetallic compound seamless steel pipe by centrifugal blank

A technology of a seamless steel pipe and a manufacturing method, which is applied in the manufacturing field, can solve the problems of low metal yield, high cost, and low yield, and achieve the effects of improving metal yield, refining grains, and reducing processing costs.

Inactive Publication Date: 2013-03-27
HANDAN XINXING SPECIAL TUBING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Centrifugal casting of composite circular tube blanks and extrusion process to produce bimetallic composite seamless steel pipes, this manufacturing method is very suitable for high-end composite pipes such as nickel-based alloy and other layers, but due to the characteristics of the manufacturing process, the yield is low, The metal yield is low and the cost is high, which limits its application
However, other composite processes are only used in low-end fields due to defects such as the bonding strength of the base layer and the complex layer.

Method used

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  • Manufacturing method for oblique rolling of bimetallic compound seamless steel pipe by centrifugal blank
  • Manufacturing method for oblique rolling of bimetallic compound seamless steel pipe by centrifugal blank
  • Manufacturing method for oblique rolling of bimetallic compound seamless steel pipe by centrifugal blank

Examples

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Effect test

no. 1 example

[0038] The first embodiment of the present invention proposes a method for manufacturing a centrifugal billet cross-rolled double-metal composite seamless steel pipe, the process of which is as follows figure 1 shown, including:

[0039] Step 101, using a centrifugal casting process on the centrifugal pipe mold to produce a bimetallic composite round pipe billet, and pushing the pipe when the temperature of the inner metal layer is 950-1400°C;

[0040] Step 102, performing heat treatment on the billet of the bimetal composite round tube according to the application of the bimetal composite round tube;

[0041] Step 103, performing machining or surface oxidation treatment on the tube billet according to the usage after rolling;

[0042] Step 104, rolling the bimetal composite round billet by a skew rolling mill;

[0043] Step 105, performing heat treatment on the rolled bimetallic composite round tube billet.

[0044] The manufacturing method of the centrifugal billet cross-...

no. 2 example

[0046] The second embodiment of the present invention proposes a method for manufacturing a centrifugal billet cross-rolled bimetal composite seamless steel pipe, which is used to manufacture a 16MnV and GCr15 centrifugal billet cross-rolled bimetal composite seamless steel pipe. The outer and inner thicknesses are 36.5mm and 18.5mm respectively, the diameter of the tube blank is 210mm, and the length is 2009mm. Process such as figure 2 shown, including:

[0047] Step 201: Produce a bimetallic composite round billet by adopting a centrifugal casting process on a centrifugal pipe mold, and push the pipe when the temperature of the inner metal layer is 950°C; wherein the outer metal of the bimetallic composite round billet is 16MnV steel material , the inner metal is GCr15 steel material;

[0048] Step 202, sending the bimetallic composite round tube billet into a hot charging furnace for annealing heat treatment, the temperature during annealing is 750-850°C, heat preservati...

no. 3 example

[0055] The third embodiment of the present invention also proposes a method for manufacturing 14MnV and 316L centrifugal billet cross-rolled bimetallic composite seamless steel pipes. The outer and inner thicknesses are 39mm and 14mm respectively, the diameter of the tube blank is 210mm, and the length is 1995mm. Process such as image 3 shown, including:

[0056] Step 301, using the centrifugal casting process on the centrifugal pipe mold to produce a bimetal composite round tube blank, and push the tube when the temperature of the inner metal layer is not lower than 1200°C; wherein the outer metal of the bimetal composite round tube blank is 14MnV Steel material, the inner metal is 316L steel material;

[0057] Step 302, spraying water into the bimetallic composite circular tube for solid solution treatment;

[0058] Step 303, machining the inner and outer surfaces and both ends of the centrifugal tube blank so that there are no defects exceeding 1mm deep marks on the inn...

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Abstract

The invention provides a manufacturing method for the oblique rolling of a bimetallic compound seamless steel pipe by a centrifugal blank, which comprises the following steps: producing a bimetallic compound circular pipe blank on a centrifugal pipe die by adopting a centrifugal casting process and pushing a pipe when the temperature of an inner-layer metal layer is 950 to 1400 DEG C; carrying out heat treatment on the bimetallic compound circular pipe blank according to the purpose of the bimetallic compound circular pipe; carrying out machining or surface oxidation treatment on the pipe blank according to the purpose after rolling; rolling the bimetallic compound circular pipe blank by adopting an oblique rolling machine set; and carrying out the heat treatment on the bimetallic compound circular pipe blank after being rolled. According to the manufacturing method for the oblique rolling of the bimetallic compound seamless steel pipe by the centrifugal blank in the production of an oblique rolling process, which is adopted by the invention, crystal grains are thinned by the centrifugal blank through the deformation of each passage of the oblique rolling machine set, and the integral performance of the seamless steel pipe is enhanced. Meanwhile, the bonding strength between two layers of metal of the bimetallic compound seamless steel pipe with the oblique rolling of the centrifugal blank is ensured by adopting the centrifugal blank and the oblique rolling process, the processing cost is also lowered, and the metal yield is enhanced.

Description

technical field [0001] The invention relates to the field of manufacturing, in particular to a method for manufacturing a bimetal composite seamless steel pipe by cross-rolling a centrifugal billet. Background technique [0002] China is a big country of steel, with a history of more than 40 years of production of stainless steel seamless pipes. Especially in the last 20 years, the production technology of stainless steel seamless pipe has made great progress. However, compared with the international advanced level, my country's stainless steel pipes still have a large gap in terms of production technology, equipment level, operation technology, and product quality. [0003] Existing manufacturing methods of bimetallic composite seamless steel pipes include explosive forming composite manufacturing methods, nested molding composite manufacturing methods, and the like. These general manufacturing methods all use two kinds of finished seamless steel pipes to manufacture. Ce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D13/00B22D19/16B21B19/02
Inventor 王黎晖张同波范新有庞于思刘静高杰陈玉娥刘富强陈建波杨永亮宋亚峰张亚彬申勇
Owner HANDAN XINXING SPECIAL TUBING CO LTD
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