A kind of high-strength cold heading steel wire rod and its production method
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A cold heading steel, high-strength technology, applied in the direction of metal rolling, etc., can solve the problem that the internal performance uniformity and fatigue performance of finished fasteners cannot be improved, and achieve excellent cold heading performance, internal Composition and tissue homogeneity effect
Active Publication Date: 2019-10-29
ANGANG STEEL CO LTD
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Problems solved by technology
In the process of rolling and controlled cooling, the composition distribution of raw materials will basically not change, so rolling and controlled cooling cannot improve the composition uniformity of cold heading steel and the internal performance uniformity and fatigue performance of finished fasteners. To solve this problem, it is necessary to carry out research work on the composition and structure uniformity of high-strength cold heading steel
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[0032] The following table includes 4 examples
[0033]
[0034]
Embodiment 1
[0036] A high-strength cold heading steel wire rod, the chemical composition ratio is: [C] 0.36%, [Si] 0.16%, [Mn] 0.36%, [P] 0.0091%, [S] 0.0071%, [Cr] 1.20% , [Mo] 0.15%, [Al] 0.015%. Wire rod diameter: 15mm.
[0037] The production process parameters of the above-mentioned high-strength cold heading steel wire rod are controlled as follows: the total billet time in the furnace: 2.8 hours, the temperature control of the soaking section: 1075 ° C, the temperature control of the pre-finishing rolling: 1034 ° C, the temperature control of the finishing rolling It is: 932°C, the temperature control of entering the double module is: 839°C, the temperature control of wire rod spinning is: 862°C, and the cooling speed control is: 0.3°C / s.
[0038] Results: The hardness deviation of a high-strength cold heading steel wire rod after quenching and tempering using the above-mentioned production process and chemical composition is 1.9HRC.
Embodiment 2
[0040] A high-strength cold heading steel wire rod, the chemical composition ratio is: [C] 0.39%, [Si] 0.18%, [Mn] 0.51%, [P] 0.0069%, [S] 0.0089%, [Cr] 1.21% , [Mo] 0.12%, [Al] 0.026%. Wire rod diameter: 9mm.
[0041] The production process parameters of the above-mentioned high-strength cold heading steel wire rod are controlled as follows: the total billet time in the furnace: 3.0 hours, the temperature control of the soaking section: 1065 °C, the temperature control of the pre-finishing rolling: 1027 °C, the temperature control of the finishing rolling It is: 946 °C, the temperature control of entering the double module is: 851 °C, the temperature control of wire rod spinning is: 875 °C, and the cooling speed control is: 0.7 °C / s.
[0042] Results: The hardness deviation of a high-strength cold heading steel wire rod after quenching and tempering using the above-mentioned production process and chemical composition is 1.5HRC.
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Abstract
The invention provides a high-strength cold-upset steel coil and a production method thereof. The steel coil comprises 0.35%-0.40%, C, 0.16%-0.24% of Si, 0.30%-0.55% of Mn, less than or equal to 0.012% of P, less than or equal to 0.010% of S, 1.20%-1.30% of Cr, 0.10%-0.15% of Mo, and 0.015%-0.035% of Al. The production process method is characterized in that total in-furnace time for steel billetheating is calculated according to the standard of 0.95-1.2 min / mm based on the specification of a square blank; the temperature of a soaking section is controlled at 1060 DEG C-1100 DEG C; the temperature for a rolled piece to be taken out from pre-finish rolling is controlled to be 1000 DEG C-1100 DEG C, the temperature for the rolled piece to start finish rolling is controlled to be 920 DEG C-980 DEG C, and the temperature for the rolled piece to enter a double-module rolling mill is controlled to be 820 DEG C-880 DEG C; and the spinning temperature of the coil is controlled to be 860 DEG C-880 DEG C, and the cooling speed is controlled to be 0.1 DEG C / s-2 DEG C / s. According to the high-strength cold-upset steel coil and the production method thereof, the internal components and tissueuniformity of the cold-upset steel coil can be greatly improved, the hardness deviation of the cross section after tempering is reduced to be within 2 HRC from 3-5 HRC, the cold-upset cracking rate isreduced, and the fatigue life of the standard piece is prolonged.
Description
technical field [0001] The invention relates to the technical field of high-carbon steel product development, in particular to a high-strength cold heading steel wire rod and a production method thereof. Background technique [0002] With the rapid development of my country's automobile industry, the demand for standard parts for automobiles continues to increase. Standard parts are widely used in the production of automobiles. The standard parts of certain key parts are closely related to the life of the car body and driving safety. Therefore, the quality requirements for standard parts are greatly improved compared with standard parts for other purposes. For the raw material cold heading steel wire rod for producing standard parts, the uniformity of its internal composition and structure has a significant impact on the formability and fatigue performance, so it is necessary to propose a technical solution for improving the internal composition and structure uniformity of t...
Claims
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Application Information
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