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Electric resistance welded stainless steel clad steel pipe and manufacturing method thereof

A technology of composite steel pipe and manufacturing method, which is applied in electric resistance welding equipment, manufacturing tools, non-electric welding equipment, etc., can solve the problems of not being able to exert the required performance and difficult to have both mechanical properties of the composite steel pipe and so on.

Active Publication Date: 2020-08-14
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When such an electric resistance welded composite steel pipe is used in an environment where corrosion resistance is required on the inner surface of the steel pipe, the required performance cannot be exhibited.
[0007] That is, in the prior art, in the electric resistance welded composite steel pipe in the electric resistance welded state, there is a problem that it is difficult to balance the mechanical properties of the welded part without impairing the function as the composite steel pipe.

Method used

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  • Electric resistance welded stainless steel clad steel pipe and manufacturing method thereof
  • Electric resistance welded stainless steel clad steel pipe and manufacturing method thereof
  • Electric resistance welded stainless steel clad steel pipe and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] A stainless steel clad steel strip consisting of an austenitic stainless steel sandwich material with a thickness of 2mm and a low-carbon low-alloy steel base material with a thickness of 5mm is prepared, and the composition of the above-mentioned austenitic stainless steel contains C: 0.015% in mass % , Si: 0.76%, Mn: 1.06%, Ni: 12.2%, Cr: 17.4%, Cu: 0.24%, Mo: 2.32%, the rest is composed of Fe and unavoidable impurities, the composition of the above-mentioned low-carbon low-alloy steel The composition contains C: 0.04%, Si: 0.2%, Mn: 1.60%, V: 0.04%, Nb: 0.05%, Ti: 0.01% in mass %, and the rest is composed of Fe and unavoidable impurities.

[0111] use figure 1 The electric resistance welded steel pipe manufacturing equipment shown in , uses the prepared stainless steel clad steel strip as the blank material, the base metal as the outer layer, and the interlayer material as the inner layer, and manufactures resistance welded stainless steel clad steel strips with an ...

Embodiment 2

[0120] An interlayer material of austenitic stainless steel having a thickness of 2 mm and having the composition shown in Table 2 (the remainder being Fe and unavoidable impurities) and a stainless steel consisting of a base material of low-carbon low-alloy steel of 5 mm in thickness were prepared Composite steel strip, the composition of the above-mentioned low-carbon low-alloy steel contains C: 0.04%, Si: 0.2%, Mn: 1.60%, V: 0.04%, Nb: 0.05%, Ti: 0.01%, and the rest Consists of Fe and unavoidable impurities.

[0121] use figure 1 The electric resistance welded steel pipe manufacturing equipment shown in , uses the prepared stainless steel clad steel strip as the blank material, uses the base material as the outer surface side of the pipe, and uses the interlayer material as the inner surface side of the pipe to manufacture electric resistance welded stainless steel clad steel pipe with an outer diameter of 300 mm. Used for gas shielding of the welded part during resistanc...

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Abstract

The present invention provides an electric resistance welded stainless steel clad steel pipe that has excellent fracture characteristics of welded parts and excellent corrosion resistance of the inner surface of the pipe in the electric resistance welded state even without performing additional welding treatment such as overlay welding after electric resistance welding. The present invention is characterized in that it is an electric resistance welded stainless steel clad steel pipe composed of an outer layer of carbon steel or low alloy steel and an inner layer of austenitic stainless steel having a predetermined composition, and complies with the regulations specified in JIS G 3445. The flattening value h / D in the 90° flattening test is less than 0.3, and the inner surface of the pipe does not produce cracks in the sulfuric acid-copper sulfate corrosion test according to ASTM A262-10, Practice E. Here, h is the flat crack height (mm), and D is the tube outer diameter (mm).

Description

technical field [0001] The invention relates to an electric resistance welded stainless steel composite steel pipe and a manufacturing method thereof. Background technique [0002] Generally, electric seam steel pipes are manufactured by forming a steel strip into a tubular shape, heating and melting it with a high-frequency current, and welding the opposite ends of the heated and melted steel strip in the width direction with butt pressure and welding. In the case of electric seam steel pipes, it is generally considered that mechanical properties such as toughness and strength of welded parts deteriorate compared with the steel strip before welding. [0003] As a cause of deteriorating the properties of the welded portion, welding defects mainly of oxides called penetrators can be cited. This overburning remains in the welded portion and causes a decrease in the toughness and strength of the welded portion. Therefore, the following countermeasures are usually taken: incre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/08B21C51/00B23K13/00B23K13/08
CPCB21C37/08B21C51/00B23K11/0873B23K11/163B23K11/34B23K20/023B23K20/04B23K20/227B23K2101/06B23K2101/10B23K2103/04B23K2103/05B23K2103/18B23K13/08C22C38/44C22C38/58B23K11/0006F16L9/16B23K11/0073F16L9/18B23K11/08B23K11/002B23K13/02B23K11/0026B23K13/025F16L9/17B23K11/00B23K11/087F16L9/165B23K11/16C22C38/12C22C38/40C22C38/20C22C38/24C22C38/48C22C38/22C22C38/42C22C38/002C22C38/18C22C38/001C22C38/02C22C38/06C22C38/26C22C38/50C22C38/38C22C38/08C22C38/46C22C38/04C22C38/14C22C38/28C22C38/16B32B15/043Y10T428/12958B32B15/01B32B15/04Y10T428/12965Y10T428/12951Y10T428/12979B32B15/00Y10T428/12972B32B15/011B32B1/08Y10T428/13B32B15/18B23K31/027F16L9/02F16L57/02F16L58/08
Inventor 井手信介松本昌士桥本裕二冈部能知
Owner JFE STEEL CORP
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