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Rolling method of high-toughness low-alloy high-strength steel

A low-alloy high-strength, high-toughness technology, applied in the field of steel rolling, can solve the problems of high production cost, unfavorable energy saving and cost reduction, and green manufacturing, and achieve the effect of saving processing time

Active Publication Date: 2021-08-06
DAYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The strength and toughness of low-alloy high-strength steel in the prior art cannot be achieved at the same time. In the prior art, only the rolling method of steel plate and strip is involved, and the method of rolling bar and round steel is not involved, and the rolling process needs to be offline Normalizing step, high production cost, not conducive to energy saving and cost reduction and green manufacturing

Method used

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  • Rolling method of high-toughness low-alloy high-strength steel

Examples

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Embodiment 1

[0075] Embodiment 1 provides a kind of rolling method of high-toughness low-alloy high-strength steel, and the required finished product specification is Select the 300×400mm cross-section continuous casting slab; wherein the mass percentage of each chemical composition in the continuous casting slab is shown in Table 2, and the mass fraction is 100% in total; the following steps are included:

[0076] (1) Heating: Cut the cross-section continuous casting slab and put it into a four-stage walking heating furnace for heating by cold delivery. The temperature in the preheating section is 685°C, the temperature in the heating section is 1005°C, and the temperature in the second heating section is 1086°C. The temperature in the soaking section is 1175° C.; the total heating time in this heating step is 3.8 hours, and the soaking time in the soaking section is 43 minutes.

[0077] (2) Descaling: The heated billet is descaled with high-pressure water to remove scale, and the pressu...

Embodiment 2

[0086] Embodiment 2 provides a kind of rolling method of high-toughness low-alloy high-strength steel, and the required finished product specification is Select 300 * 400mm cross-section continuous casting slab; Wherein the mass percentage of each chemical composition in the continuous casting slab, as shown in Table 2, the mass fraction is 100% altogether; Described rolling method passes through the following steps successively: (1) heating, (2) Descaling, (3) Rough rolling, (4) Continuous rolling, (5) First water cooling, (6) Finish rolling, (7) Second water cooling and (8) Cooling bed cooling (cooling bed air cooling), the processing steps of embodiment 2 are the same as embodiment 1, and the processing parameters of its concrete steps are referring to table 1, and its steel product mechanical properties are as shown in table 3.

[0087] The microstructure of the high-toughness low-alloy high-strength steel hot-rolled state that embodiment 2 obtains is uniform ferrite and ...

Embodiment 3

[0089] Embodiment 3 provides a kind of rolling method of high-toughness low-alloy high-strength steel, and the required finished product specification is Select 300 * 400mm cross-section continuous casting slab; Wherein the mass percentage of each chemical composition in the continuous casting slab, as shown in Table 2, the mass fraction is 100% altogether; Described rolling method passes through the following steps successively: (1) heating, (2) Descaling, (3) Rough rolling, (4) Continuous rolling, (5) First water cooling, (6) Finish rolling, (7) Second water cooling and (8) Cooling bed cooling (cooling bed air cooling), the processing steps of embodiment 3 are the same as embodiment 1, and the processing parameters of its concrete steps are referring to table 1, and its steel product mechanical properties are as shown in table 3.

[0090] The hot-rolled structure of the high-toughness low-alloy high-strength steel obtained in Example 3 is uniform ferrite and pearlite, and t...

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Abstract

The invention provides a rolling method of high-toughness low-alloy high-strength steel. The rolling method sequentially comprises the following steps of heating, descaling, rough rolling, continuous rolling, first-time water cooling, finish rolling, second-time water cooling and cooling bed air cooling. A continuous casting billet of a converter is used as a raw material, and the continuous casting billet is prepared from the following chemical components in percentage by mass: less than or equal to 0.20% of C, less than or equal to 0.60% of Si, 1.00%-1.70% of Mn, less than or equal to 0.30% Cr, less than or equal to 0.020% of P, less than or equal to 0.020% of S, 0.05%-0.10% of V, less than or equal to 0.03% of Al, less than or equal to 0.025% of N, the balance of Fe and inevitable impurities. By means of the rolling method, the actual grain size of the low-alloy high-strength steel can be refined, the comprehensive performance of the low-alloy high-strength steel is excellent, the metallographic structure is fine ferrite and pearlite, the grain size reaches 9.0 grade or above, the ballistic work at the temperature of-20 DEG C is larger than 100 J, and the ballistic work at the temperature of-40 DEG C is larger than 80 J.

Description

technical field [0001] The invention relates to the field of steel rolling, in particular to a rolling method of high-toughness low-alloy high-strength steel. Background technique [0002] With the economic development of society and the advancement of science and technology, steel materials have been widely used in various fields, among which low-alloy high-strength steel has been widely used in high-end fields such as aerospace and ships because of its high strength, good plasticity and toughness. , especially in oil pipelines, bridges, large buildings and other infrastructure and vehicles, containers and machinery, chemical, medical, light industrial equipment and other engineering fields are also widely used. Low-alloy high-strength steel is widely used in the fields of mechanical equipment, vehicles and pipes due to its high strength, superior formability and stable comprehensive performance. [0003] At present, the ways to improve the strength of steel materials incl...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/06C22C38/38C22C38/24C21D8/02
CPCC22C38/02C22C38/04C22C38/12C22C38/06C22C38/38C22C38/24C21D8/0226C21D2211/005C21D2211/009C21D9/0075C21D8/065C21D7/13C21D1/60B21B37/76B21B45/0203C21D9/0062C22C38/001
Inventor 李小龙时涛周敦世
Owner DAYE SPECIAL STEEL CO LTD