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Thermally-formed steel plate with high fatigue strength for axle housing of heavy truck, and manufacturing method thereof

A fatigue strength, heavy-duty truck technology, applied in the high-fatigue-strength thermoforming heavy-duty truck axle housing steel plate and its manufacturing field, achieves the effects of improving plasticity and toughness index, good welding performance, and improving fatigue strength limit performance

Inactive Publication Date: 2014-07-23
JIGANG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mainly due to the lack of micro-alloy strengthening elements, low strength and impure steel, resulting in low fatigue strength and fatigue life
[0004] Therefore, with the development of the society and the market, Q345B steel plates are increasingly unable to meet the use of modern heavy-duty truck axle housings, especially for 30-70 ton heavy-duty trucks. The yield strength, tensile strength and service life of the Q345B type steel plate cannot meet its use, so there is an urgent need for a steel plate with superior performance and its manufacturing method

Method used

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  • Thermally-formed steel plate with high fatigue strength for axle housing of heavy truck, and manufacturing method thereof
  • Thermally-formed steel plate with high fatigue strength for axle housing of heavy truck, and manufacturing method thereof
  • Thermally-formed steel plate with high fatigue strength for axle housing of heavy truck, and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The slab smelting composition is:

[0031] C: 0.18%, Si: 0.33%, Mn: 1.65%, P: 0.016%, S: 0.001%, Nb: 0.027%, V: 0.045%, Ti: 0.026%, Al: 0.021%, Cr: 0.32%; The rest is Fe and unavoidable impurities.

[0032] Slab soaking temperature (°C): 1150; soaking time (hours): 3.8; rough rolling temperature (°C): 1100; rough rolling single pass reduction rate (%): 22; finish rolling start temperature (°C ): 870; finish rolling finish rolling temperature finish rolling (℃): 820; single pass reduction rate (%): 18.

[0033] Steel plate mechanical properties:

[0034] Specifications: steel plate thickness 12mm; yield strength (MPa): 525; tensile strength (MPa): 690; elongation after fracture (%): 18; cold bending: qualified; V-shaped longitudinal impact energy (0°C): 119J, 123J, 126J, Pcm: 0.22; Ceq: 0.42.

[0035] Metallographic structure: ferrite plus pearlite.

[0036] The finished axle housing was tested for fatigue test, the fatigue limit was 1.53 million times, and the fati...

Embodiment 2

[0038] With the above steel billets;

[0039] Slab soaking temperature (°C): 1120; soaking time (hours): 3.5; rough rolling temperature (°C): 1080; rough rolling single pass reduction rate (%): 21; finish rolling temperature (°C): 880; finish rolling finish rolling temperature finish rolling (°C): 820; single pass reduction rate (%): 18, Pcm: 0.23; Ceq: 0.41.

[0040] Steel plate mechanical properties:

[0041] Specifications: steel plate thickness 16mm; yield strength (MPa): 515; tensile strength (MPa): 675; elongation after fracture (%): 19; cold bending: qualified; V-shaped longitudinal impact energy (0°C): 132J, 136J, 129J;

[0042] Metallographic structure: ferrite plus pearlite;

[0043] The finished axle housing was tested for fatigue test, the fatigue limit was 1.52 million times, and the fatigue strength was 480MPa.

Embodiment 3

[0045] The slab smelting composition is:

[0046] C: 0.17%, Si: 0.27%, Mn: 1.55%, P: 0.013%, S: 0.001%, Nb: 0.027%, V: 0.045%, Ti: 0.017%, Al: 0.021%, Cr: 0.36%; The rest is Fe and unavoidable impurities.

[0047] Slab soaking temperature (°C): 1150; soaking time (hours): 3.2; rough rolling temperature (°C): 1120; rough rolling single pass reduction rate (%): 26; finish rolling start temperature (°C ): 860; finish rolling finish rolling temperature finish rolling (℃): 820; finish rolling single pass reduction rate (%): 17.

[0048] Steel plate mechanical properties:

[0049] Specifications: steel plate thickness 14mm; yield strength (MPa): 535; tensile strength (MPa): 685; elongation after fracture (%): 18; cold bending: qualified; V-shaped longitudinal impact energy (0°C): 140J, 142J, 140J; Pcm: 0.22, Ceq: 0.40.

[0050] Metallographic structure: ferrite plus pearlite.

[0051]The finished axle housing was tested for fatigue test, the fatigue limit was 2.11 million times...

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Abstract

The invention relates to a thermally-formed steel plate with high fatigue strength for axle housing of heavy truck, and a manufacturing method thereof. The steel plate is composed of the following components in percentage by weight: 0.1 to 0.22% of carbon, 0.1 to 0.65% of silicon, 0.8 to 1.8% of manganese, not more than 0.55% of copper, not more than 0.025% of phosphor, not more than 0.003% of sulfur, 0.012 to 0.06% of niobium, 0.015 to 0.07% of vanadium, 0.012 to 0.05% of titanium, 0.012 to 0.045% of aluminum, 0.1 to 0.55% of chromium, and the balance being Fe and inevitable impurities. A niobium-vanadium alloy is added, the crystals are refined and toughened, impurities and harmful gas are removed in the assistance of a refine technology, and thus the steel is more pure, and obtains more excellent toughness. Furthermore, a controlled rolling technology is adopted to process the steel plate, the tissue internal stress is eliminated, and the ductility and toughness are improved, so the steel plate has a good welding performance. Moreover, the steel plate is subjected to a desulfurization process and a degassing process, the limiting performance of fatigue strength is greatly improved, and the service life is prolonged.

Description

Technical field: [0001] The invention relates to a steel plate and a manufacturing method thereof, in particular to a high-fatigue strength hot-formed heavy-duty truck axle housing steel plate and a manufacturing method thereof. Background technique: [0002] Following the market demand, my country's heavy-duty trucks are gradually being developed in the direction of reducing chassis weight, reducing fuel consumption, reducing emissions and pollution, increasing transport capacity, and prolonging the service life of heavy-duty trucks, including the use of high-strength steel to reduce and thin the chassis. At present, more and more attention is paid to high-fatigue, high-strength and easy-weldable hot-rolled axle housing steel plates; the technical requirements for high-fatigue, high-strength and easy-weldable steel plates for axle housings are clearly stipulated in terms of size, chemical composition, and mechanical properties. The high-strength axle housing structural st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/28C22C38/38C22C33/04C21D8/02
Inventor 冯勇孙卫华孙德民刘晓东张爱民胡淑娥许方泉梁英王南辉李延芝乔松韩启彪侯登义
Owner JIGANG GRP
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