Hollow stabilizer, and steel pipe for hollow stabilizers and method for production thereof

A manufacturing method and technology for stabilizer bars, which are applied in the directions of manufacturing tools, transportation and packaging, furnace types, etc., can solve problems such as fatigue failure of hollow stabilizer bars, and achieve the effects of excellent fatigue durability and delayed failure characteristics.

Active Publication Date: 2015-03-04
NIPPON STEEL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Additionally, hollow stabilizer bars suffer fatigue failure from inner surfaces that are absent in solid stabilizer bars

Method used

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  • Hollow stabilizer, and steel pipe for hollow stabilizers and method for production thereof
  • Hollow stabilizer, and steel pipe for hollow stabilizers and method for production thereof
  • Hollow stabilizer, and steel pipe for hollow stabilizers and method for production thereof

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0083] (Manufacturing Example 1 of Stabilizer Bar) Cold Forming

[0084] Next, use Figure 8 , Manufacturing Example 1 of the stabilizer bar will be described. Bending and forming steel pipes (electrically welded pipes, seamless pipes, heat reducing pipes, or their drawn pipes) cut to a specified length into figure 2 The desired shape shown (process: bending forming), using furnace heating or electric heating or high-frequency heating device, heated to the austenite temperature range (process: heating), quenching in water (or other quenching medium) ( Process: Quenching). Further, the thermally deformed stabilizer bar is corrected to the desired shape of the stabilizer bar (process: shape correction), and tempered (process: tempering), only the outer surface of the tempered pipe, or the outer surface and Both inner surfaces are shot blasted (process: shot blasting), and painted with a desired paint (process: painting). However, if restraint quenching is performed, shape c...

manufacture example 2

[0085] (Manufacturing Example 2 of Stabilizer Bar) Thermoforming

[0086] Next, use Figure 9 , Manufacturing Example 2 of the stabilizer bar will be described. Heating steel pipes (electrically welded pipes, seamless pipes, heat reducing pipes, or their drawn pipes) cut to a predetermined length by furnace heating, electric heating, or high-frequency heating equipment to the austenite temperature range (process: heating) , bent into figure 2 The desired shape shown (process: bending forming) is quenched in water (or other quenching medium) (process: quenching). Further, the thermally deformed stabilizer bar is corrected to the desired shape of the stabilizer bar (process: shape correction), and tempered (process: tempering), only the outer surface of the tempered pipe, or the outer surface and Both inner surfaces are shot blasted (process: shot blasting), and painted with a desired paint (process: painting). However, if restraint quenching is performed, shape correction ...

Embodiment 1

[0089] The present invention will be described more specifically below by way of examples.

[0090]Each steel type having the composition shown in Table 1 was smelted and cast to form a slab, and the obtained slab was heated to 1200° C., hot-rolled at a hot finishing temperature of 890° C. and a coiling temperature of 630° C. to produce A steel plate with a thickness of 5mm is formed. These steel sheets were cut into predetermined widths, roll-formed into tubes, and then welded by high-frequency electric welding to manufacture electric-welded steel pipes with an outer diameter of 90 mm. Furthermore, the obtained electric-welded steel pipe was heated to 980°C by high-frequency induction heating, and reduced-rolled to produce a steel pipe with an outer diameter of 30 mm and a wall thickness of 4.5 mm (t / D: 0.15) or a steel pipe with an outer diameter of 30 mm. 22mm, 4.5mm thick (t / D: 0.20) steel pipe (steel pipe for hollow stabilizer bars). Immediately after reducing rolling, ...

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Abstract

A hollow stabilizer having a component composition containing 0.26 to 0.30% of C, 0.05 to 0.35% of Si, 0.5 to 1.0% of Mn, 0.05 to 1.0% of Cr, 0.005 to 0.05% of Ti, 0.0005 to 0.005% of B and 0.0005 to 0.005% of Ca, wherein the contents of Al, P, S, N and O are limited to 0.08% or less, 0.05% or less, less than 0.0030%, 0.006% or less and 0.004% or less, respectively, the remainder of the component composition is made up by Fe and unavoidable impurities, the value of the product of the Mn content and the S content is 0.0025 or less, and the critical cooling velocity (Vc90) represented by a given formula is 40°C/s or less, and wherein the metallic structure is composed of a tempered martensite, the length of stretched MnS occurring in a center part of the hollow stabilizer as observed in a thickness direction is 150 mum or less, an HRC value is 40 to 50, the thickness/(outer diameter) ratio is 0.14 or more, and the depth of a decarburized layer in the inner surface part of the hollow stabilizer is 20 mum or less from the inner surface, said hollow stabilizer having higher strength compared with conventional hollow stabilizers and also having excellent fatigue properties; and a steel pipe for hollow stabilizers, which is used as a material for the hollow stabilizer.

Description

technical field [0001] The present invention relates to a hollow stabilizer bar used in vehicles such as automobiles, a steel pipe for a hollow stabilizer bar as a raw material thereof, and a manufacturing method thereof. Background technique [0002] In vehicles such as automobiles, stabilizers are used to reduce the vibration of the vehicle body when cornering and ensure the stability of the vehicle body when driving at high speed. Traditionally, stabilizer bars were manufactured by machining solid materials such as bar steel into desired shapes, but in recent years, hollow stabilizer bars using hollow materials such as seamless steel pipes and electric welded steel pipes have gradually increased in order to achieve weight reduction. [0003] In the case of changing from a solid stabilizer bar design to a hollow stabilizer bar, in order to maintain the same roll stiffness, the outer diameter of the hollow stabilizer bar needs to be larger than that of the solid stabilizer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00B21C1/00B21C37/08B60G21/055C21D8/10C21D9/08C22C38/32C22C38/54
CPCC21D9/085C22C38/54B21C51/00C21D2211/009C21D7/06B60G21/055C21D2211/004C22C38/04C21D2211/005C21D8/10B21C37/08C22C38/002B60G2206/72B60G2206/427C21D2211/008C22C38/06C22C38/02C22C38/28C21D9/08C21D8/105C22C38/001C22C38/32C22C38/00C21D7/13C21D9/50C22C38/22C22C38/24C22C38/26C22C38/50C22C38/40
Inventor 石塚哲夫小弓场基文岩村雅通丹下彰高桥研栗本清若林丰
Owner NIPPON STEEL CORP
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