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Steering knuckle non-quenched and tempered steel substituting 40Cr quenched and tempered steel and production method thereof

A non-quenched and tempered steel and steering knuckle technology, which is applied in the field of non-quenched and tempered steel for high-strength and toughness steering knuckles and non-quenched and tempered steel for steering knuckles, can solve the problem that the machining accuracy and assembly accuracy of parts cannot be guaranteed, and the parts The problems of uneven section performance and complex shape of the steering knuckle can achieve the effect of excellent assembly accuracy, avoiding quenching and tempering heat treatment, and eliminating the need for straightening.

Active Publication Date: 2017-03-22
JIANGSU LIHUAI IRON AND STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the shortcomings of quenched and tempered 40Cr quenching cracking, bending deformation and straightening are inherently inevitable, so the machining accuracy and assembly accuracy of parts cannot be strongly guaranteed
Another notable defect of quenched and tempered structural steel is that its mechanical properties are guaranteed by quenched and tempered heat treatment, but the complex shape and uneven thickness of the steering knuckle lead to uneven cross-sectional properties of quenched and tempered parts, which often make it in service. Failure occurs at the weak link location

Method used

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  • Steering knuckle non-quenched and tempered steel substituting 40Cr quenched and tempered steel and production method thereof
  • Steering knuckle non-quenched and tempered steel substituting 40Cr quenched and tempered steel and production method thereof
  • Steering knuckle non-quenched and tempered steel substituting 40Cr quenched and tempered steel and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Non-quenched and tempered steel for steering knuckle instead of 40Cr quenched and tempered steel, which includes the following components according to weight percentage (%): C: 0.38, Si: 0.60, Mn: 1.25, P: 0.010, S: 0.040, Cu: ≤0.20, Cr: 0.25, Mo: 0.02, Al: 0.010, V: 0.15, Nb: 0.015, Ti: 0.010, N: 0.017, [H] is 1.2 ppm, [O] is 9 ppm, and the rest is Fe.

[0082] A method for producing the above-mentioned non-quenched and tempered steel for steering knuckle instead of 40Cr quenched and tempered steel, comprising the following steps: hot metal desulfurization → LD → LF → RH → continuous casting → cutting → cooling → inspection → determination → heating in a heating furnace → control Rolling→cooling→ultrasonic+magnetic flux leakage inspection→judgment→packaging→weighing→storage.

[0083] When LD high-purity steel is refined, the content of Mn in LF smelting is targeted at 1.25%, and is controlled within the range of 1.20%-1.30%. When RH is hoisted, S wire is fed to the tar...

Embodiment 2

[0094] Non-quenched and tempered steel for steering knuckle instead of 40Cr quenched and tempered steel, which includes the following components according to weight percentage (%): C: 0.39, Si: 0.62, Mn: 1.23, P: 0.008, S: 0.045, Cu: ≤0.20, Cr: 0.24, Mo: 0.01, Al: 0.012, V: 0.14, Nb: 0.016, Ti: 0.012, N: 0.016, [H] is 1.0 ppm, [O] is 10 ppm, and the rest is original Fe.

[0095] The method for producing the above-mentioned non-quenched and tempered steel for steering knuckle instead of 40Cr quenched and tempered steel comprises the following steps: hot metal desulfurization→LD→LF→RH→continuous casting→cutting→cooling→inspection→judgment→heating in a heating furnace→controlled rolling→ Cooling→ultrasonic+magnetic flux leakage testing→judgment→packaging→weighing→storage.

[0096] When LD high-purity steel is refined, the content of Mn in LF smelting is targeted at 1.23%, and is controlled within the range of 1.20%-1.30%. When RH is hoisted, the S wire is fed to the target value ...

Embodiment 3

[0107] Non-quenched and tempered steel for steering knuckle instead of 40Cr quenched and tempered steel, which includes the following components according to weight percentage (%): C: 0.37, Si: 0.65, Mn: 1.26, P: 0.009, S: 0.042, Cu: ≤0.20, Cr: 0.27, Mo: 0.02, Al: 0.008, V: 0.17, Nb: 0.017, Ti: 0.008, N: 0.016, [H] is 1.5 ppm, [O] is 11 ppm, and the rest is original Fe.

[0108] The method for producing the above-mentioned non-quenched and tempered steel for steering knuckle instead of 40Cr quenched and tempered steel comprises the following steps: hot metal desulfurization→LD→LF→RH→continuous casting→cutting→cooling→inspection→judgment→heating in a heating furnace→controlled rolling→ Cooling→ultrasonic+magnetic flux leakage testing→judgment→packaging→weighing→storage.

[0109]When LD high-purity steel is refined, the content of Mn in LF smelting is targeted at 1.26%, and is controlled within the range of 1.20%-1.30%. When RH is hoisted, the S wire is fed to the target value a...

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Abstract

The invention discloses a steering knuckle non-quenched and tempered steel substituting 40Cr quenched and tempered steel and a production method thereof. The steering knuckle non-quenched and tempered steel substituting 40Cr quenched and tempered steel comprises the following components by weight percentage (%):0.35-0.42 of C, 0.50-0.80 of Si, 1.20-1.40 of Mn, less than or equal to 0.013 of P, 0.030-0.050 of S, less than or equal to 0.20 of Cu, 0.20-0.35 of Cr, less than or equal to 0.05 of Mo, 0.010-0.035 of Al, 0.12-0.20 of V, less than or equal to 0.035 of Nb, 0.007-0.020 of Ti, 0.014-0.02 of N, and the balance Fe. According to the component ratio and production method provided by the invention, through perfect combination of the chemical composition optimal design and controlled rolling and controlled cooling technology (rolling parameters), the smelting process, the start rolling temperature and finishing rolling temperature, and the cooling way of the formula are strictly controlled, thus realizing production of the steering knuckle non-quenched and tempered steel with the characteristics of easy turning and high strength and toughness.

Description

technical field [0001] The invention relates to the field of non-quenched and tempered steel for high-strength toughness steering knuckle, in particular to a non-quenched and tempered steel for steering knuckle instead of 40Cr quenched and tempered steel and a production method thereof. Background technique [0002] Steering Knuckle, also known as "horns", is one of the important parts in the steering axle of a car, which can make the car run stably and transmit the driving direction sensitively. Its function is to transmit and bear the front load of the car, support and drive the front wheel to rotate around the kingpin to make the car turn. When the car is running, it bears variable impact loads, so it is required to have high strength. [0003] The steering knuckle is the key connection between the car wheel and the axle. It must not only bear the bending stress of the car when it is bumping, the twisting force when turning, but also ensure that the car has sufficient im...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/60C22C38/20C22C38/22C22C38/06C22C38/24C22C38/26C22C38/28C21C7/10C21C7/072C21D8/00
CPCC21C7/072C21C7/10C21D8/00C22C38/001C22C38/02C22C38/04C22C38/06C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/60
Inventor 谭利肖波包耀宗陈少慧郑力宁
Owner JIANGSU LIHUAI IRON AND STEEL CO LTD
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