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Ball stud steel of automobile steering system and manufacturing method thereof

A technology of automobile steering system and manufacturing method, which is applied in the field of non-quenched and tempered free-cutting cold-deformed steel for automobile steering system ball pins and its manufacturing field, which can solve the problems of lack of systematic and comprehensive research, unstable performance of cold-deformed parts, and constraints on cold-deformation. Market application of micro-alloyed non-quenched and tempered steel for deformation, etc., to achieve the effect of reducing precipitation strengthening effect, excellent cutting performance, and excellent comprehensive mechanical properties

Inactive Publication Date: 2016-08-03
BAOSTEEL SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, there is a lack of systematic and comprehensive research on microalloyed non-quenched and tempered steels for cold deformation
Affected by factors such as equipment limitations and insufficient mature demand in the existing market, controlled rolling and controlled cooling technology for hot-rolled wire rods of microalloyed non-quenched and tempered steels for cold deformation, effects of cold deformation on mechanical properties of microalloyed non-quenched and tempered steels, cold deformation Insufficient studies on the effects of hydrogen embrittlement of microalloyed non-quenched and tempered steels lead to unstable performance of cold-deformed parts, which restricts the market application of micro-alloyed non-quenched and tempered steels for cold deformation

Method used

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  • Ball stud steel of automobile steering system and manufacturing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The chemical composition of the smelted billet is shown in Table 1, which is C0.34%, Si0.72, Mn1.35%, S0.025%, Cr0.07%, V0.12%, Ti0.02%, N0.017%, The balance is Fe and unavoidable impurities. After refining, it is continuously cast into a 160 square billet, the continuous casting degree is 1.4, the soaking temperature of the billet is 1100°C, the heating time is 250min, the starting rolling temperature is 1000°C, the final rolling temperature is 925°C, and the cumulative rolling reduction is controlled to be no less than 80%, the spinning temperature is 900°C; after spinning, the upper Steyr slow cooling is controlled by wire, the cooling speed is 1.5°C / s, the coil is cooled to below 400°C, cooled naturally and packed in bundles. The grain size of the hot-rolled material is 9.0, the yield strength is 550MPa, the tensile strength is 820MPa, and the elongation is 23%.

Embodiment 2

[0053] The chemical composition of the smelted billet is shown in Table 1, which is C0.29%, Si0.65, Mn1.55%, S0.019%, Cr0.08%, V0.13%, Ti0.02%, N0.023%, The balance is Fe and unavoidable impurities. After refining, it is continuously cast into 160 billet. The soaking temperature of the continuous casting billet is 1150°C, the heating time is 250min, the starting rolling temperature is 1000°C, and the final rolling temperature is 900°C. The silk temperature is 900°C; after silk spinning, the Steyr slow cooling line controls the cooling, the cooling speed is 0.65°C / s, the coil is cooled to below 400°C, cooled naturally and bundled for packaging. The grain size of the hot-rolled material is 8.5, the yield strength is 590MPa, the tensile strength is 780MPa, and the elongation is 28%.

Embodiment 3

[0055] The chemical composition of the smelted billet is shown in Table 1, which is C0.21%, Si0.80, Mn1.92%, S0.021%, Cr0.12%, V0.15%, Ti0.02%, N0.021%, The balance is Fe and unavoidable impurities. After refining, the slab is continuously cast, the soaking temperature of the continuous casting slab is 1100°C, the heating time is 250min, the starting rolling temperature is 1000°C, and the final rolling temperature is 870°C. The temperature is 900°C; after spinning, the cooling rate is 0.65°C / s, cooled to below 400°C and collected into coils, cooled naturally and packed in bundles. The grain size of the hot-rolled material is 8.0, the yield strength is 490MPa, the tensile strength is 740MPa, and the elongation is 33%.

[0056] The chemical composition wt% of the embodiment of table 1, the balance is iron and impurities

[0057]

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Abstract

The invention relates to ball stud steel of an automobile steering system and a manufacturing method thereof. the steel product contains the following chemical components (by weight): 0.08-0.45% of C, 0.35-1.80% of Si, 0.7-2.6% of Mn, 0.01-0.06% of S, P being less than or equal to 0.025%, 0.05-0.30% of Cr, 0.05-0.35% of V, 0.010-0.060% of Ti, 0.005-0.050% of N and the rest of Fe and unavoidable impurities. The steel has moderate strength, good plasticity and good machinability, and can be used in manufacturing ball studs for an automobile steering system of above 900 MPa. In addition, production technology is simple and environmentally friendly, the hot-rolled steel product requires no annealing or quenching-and-tempering heat treatment, energy conservation and emission reduction can be effectively achieved, and manufacturing cost of workpieces can be reduced.

Description

technical field [0001] The invention belongs to the field of alloy steel, and in particular relates to a non-quenched and tempered easy-cutting cold-deformed steel for a ball pin of an automobile steering system and a manufacturing technology thereof. Background technique [0002] Micro-alloyed non-quenched and tempered steel (hereinafter referred to as non-quenched and tempered steel) is a new type of energy-saving structural material that combines rolling (or forging) and heat treatment, which can save the quenching and tempering treatment. Compared with traditional quenched and tempered steel, micro-alloyed non-quenched and tempered steel has many advantages such as energy saving, high yield, excellent finished product performance, short production cycle and low cost, and can replace a considerable amount of quenched and tempered steel. High-tech steel grades with high content, strong driving force, and large influence are also cutting-edge hot materials that are currentl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/60C22C38/58C22C38/50C21D8/00
Inventor 丁毅覃明安金敏赛浩
Owner BAOSTEEL SPECIAL STEEL CO LTD
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