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Al-plated welded pipe for quenching, al-plated hollow member, and manufacturing method thereof

A technology for coating and electric resistance welded pipes, which can be used in welding media, welding equipment, manufacturing tools, etc., and can solve problems such as surface deterioration.

Active Publication Date: 2022-02-11
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the heating temperature (800 to 1000°C) in hot working is higher than the decomposition temperature of organic materials, the boiling point of Zn, etc., and when heating by hot working, the plating layer on the surface evaporates, and the surface properties may deteriorate significantly. reason

Method used

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  • Al-plated welded pipe for quenching, al-plated hollow member, and manufacturing method thereof
  • Al-plated welded pipe for quenching, al-plated hollow member, and manufacturing method thereof
  • Al-plated welded pipe for quenching, al-plated hollow member, and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0149] Al plating was performed by a hot-dip coating method using cold-rolled steel sheets (thickness 1.2 to 2.0 mm) having steel compositions shown in Table 1 below. The annealing temperature during Al plating is about 800°C, and the Al plating bath contains Si: 9%, and also contains about 2% Fe eluted from the steel strip. Use the gas wiping method to adjust the plating adhesion after plating to 20-100g / m on one side 2 .

[0150] For a part of the cold-rolled steel sheet, after cooling, use a roll coater to coat a liquid containing an acrylic binder of 20% relative to the amount of ZnO in a suspension containing ZnO with an average particle diameter of about 50 nm. Sintered at 80°C. The amount of adhesion is 0.1~1.5g / m on one side in terms of Zn amount 2 .

[0151] Table 1 Steel composition of the test material (unit: mass %)

[0152] C Si mn P S Ti B Al N 0.22 0.13 1.28 0.006 0.003 0.02 0.004 0.04 0.003

[0153] ※The balance is Fe and...

experiment example 2

[0184] Al plating was performed under the same conditions as in Example 1 on a steel sheet having a thickness of 1.4 mm having the steel composition shown in Table 3 below. The thickness of the Al plating layer was 24 μm, and the thickness of the alloy layer was 5 μm. This steel sheet was formed into a steel pipe with an outer diameter of 32 mm, and the welded portion was sprayed with Al to a thickness of about 30 μm. Then, the thermal spraying material adhesion evaluation shown in Example 1 was implemented.

[0185] table 3

[0186]

[0187] As a result, for symbols B to D, peeling of the thermal spraying material was confirmed. From this result, it is clear that it is preferable to reduce P, Al, and N as components in steel. Regarding conditions other than these, peeling of the thermal spraying material was not confirmed.

[0188] In addition, these steel pipes were subjected to hot press processing under the same conditions as in Example 1 (temperature increase rate:...

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Abstract

An Al-plated electric resistance welded pipe for quenching capable of suppressing the generation of scale inside a plating layer and performing hot working, and an Al-plated hollow member using the above-mentioned Al-plated electric resistance welded pipe, wherein the Al-plated pipe for quenching is characterized in that The clad electric resistance welded pipe is composed of a base material part made of a cylindrical steel plate and having a predetermined chemical composition, and an electric resistance welded part provided at the butt joint part of the steel plate and extending in the longitudinal direction of the steel plate. An intermetallic compound layer comprising an Al-Fe-Si-based intermetallic compound located on the surface of the steel sheet and an Al plating layer comprising Al and Si located on the surface of the intermetallic compound layer are further provided, and the intermetallic The thickness of the compound layer is set as X (μm), the thickness of the Al coating is set as Y (μm), the tube thickness of the steel pipe is set as t (mm), and the outer diameter of the steel pipe is set as D (mm) , 70×X / D≤Y / t≤30.

Description

technical field [0001] The present invention relates to an Al-plated welded pipe for quenching, a method for producing a hot-pressed Al-plated hollow member, and an Al-plated hollow member. Background technique [0002] In recent years, in order to protect the environment and suppress global warming, the demand to suppress the consumption of fossil fuels is increasing, and this demand affects various manufacturing industries. For example, automobiles, which are indispensable in daily life and activities as means of mobility, are required to improve fuel efficiency by reducing the weight of the vehicle body and the like. However, in automobiles, it is not only necessary to reduce the weight of the vehicle body, but also to ensure the required strength and appropriate safety. [0003] Most automobile structures are formed of steel, and reducing the mass of the steel is important for reducing the weight of the vehicle body. In particular, since steel pipes have a closed struc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/28C23C2/12C23C2/38
CPCC22C38/00C22C38/60C23C2/12C23C2/26C23C2/28C23C2/38C23C2/40C23C28/00B23K35/0261C22C38/42C22C38/44C22C38/001C22C38/54B23K35/3053C22C38/48C22C38/002C22C38/50C22C38/02C21D9/08C22C38/06B23K11/0873B23K11/163B23K13/046C25D7/04C23C2/29B23K2103/04B23K2101/06B23K11/002C25D3/44
Inventor 真木纯藤田宗士中村登代充
Owner NIPPON STEEL CORP
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