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A thin-gauge hot-rolled low-alloy high-strength steel and its preparation method

A high-strength steel and low-alloy technology, which is applied in the field of thin-gauge hot-rolled low-alloy high-strength steel and its preparation, can solve the problems of unstable rolling, large rolling force, and high strength, and achieve reduced rolling difficulty and reduced rolling force, strength-enhancing effect

Active Publication Date: 2021-06-15
SHOUGANG CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies of the above-mentioned prior art, the present invention provides a thin-gauge hot-rolled low-alloy high-strength steel and a preparation method thereof to solve the problem of thin thickness and low strength in the rolling process of the thin-gauge hot-rolled low-alloy high-strength steel in the prior art. High, large rolling force and unstable rolling during hot rolling

Method used

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  • A thin-gauge hot-rolled low-alloy high-strength steel and its preparation method
  • A thin-gauge hot-rolled low-alloy high-strength steel and its preparation method
  • A thin-gauge hot-rolled low-alloy high-strength steel and its preparation method

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Effect test

Embodiment

[0061] Embodiments 1 to 5 provide a method for preparing thin-gauge hot-rolled low-alloy high-strength steel. The qualified molten steel obtained from blast furnace ironmaking, molten iron pretreatment, converter smelting and refining is continuously cast to obtain slabs, slabs The chemical composition of the billet is shown in Table 1. The slab is sequentially subjected to heating, rough rolling, finish rolling, laminar cooling and coiling to obtain high-strength steel. The process control of heating, rough rolling, finish rolling, laminar cooling and coiling process is shown in Table 2, the rolling force of each stand in the finish rolling process is shown in Table 3, the volume ratio and volume ratio of each metallographic structure of high-strength steel The thickness of the oxide scale is shown in Table 4.

Embodiment 1

[0077] As can be seen from the test results of the mechanical properties of Embodiment 1 to Example 5, the embodiment has obtained the mechanical properties that meet the requirements, and Table 6 shows the difference in mechanical properties between the transverse and longitudinal directions. As can be seen from Table 6, compared with the comparative example 1 and Comparative Example 2, Examples 1 to 5 have smaller differences in transverse and longitudinal yield strength, tensile strength and elongation, better isotropy, and improved steel plate formability. In view of the fact that Example 1 and Example 2 belong to the same intensity level as Comparative Example 1 and Comparative Example 2, compared with Comparative Example 1 and Comparative Example 2, the rolling forces of Example 1 and Example 2 of the present application have a significant difference. The reduction of the rolling stability improves the rolling stability, which is consistent with the aforementioned V eleme...

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Abstract

The invention discloses a thin-gauge hot-rolled low-alloy high-strength steel and a preparation method thereof. The high-strength steel is composed of the following chemical components in mass fractions, C: 0.03-0.1%, Si: 0.1-0.6%, Mn: 0.5- 1.8%, P≤0.02%, S≤0.006%, Al: 0.015~0.05%, V: 0.01‑0.07%, N: 0.01‑0.03%, and the rest are Fe and unavoidable impurities. Adopting the composition design of the present invention to prepare thin-gauge high-strength steel can reduce rolling force and improve production stability; can reduce heating temperature and save energy consumption; can improve the uniformity of product performance and improve surface quality.

Description

technical field [0001] The invention belongs to the technical field of iron and steel preparation, and in particular relates to a thin-gauge hot-rolled low-alloy high-strength steel and a preparation method thereof. Background technique [0002] Low-alloy high-strength steel is based on carbon structural steel with a small amount of alloying elements such as Mn, Si and trace amounts of Nb, V or Ti added, thereby increasing the strength and can be widely used in bridges, ships, etc. that require high strength. Vehicles, oil and gas pipelines, large steel structures, etc. Especially in the application of the automobile industry, in order to ensure safety, reduce fuel consumption and emissions, low-alloy high-strength steel is required to have high strength to improve safety, and at the same time reduce thickness to reduce self-weight to achieve energy saving and emission reduction. [0003] After cold rolling, the hot-rolled low-alloy high-strength steel has thin thickness an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C22C38/06C22C38/04C22C38/02C21D8/02
CPCC21D8/0205C21D8/0247C21D2211/005C21D2211/009C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 张衍郭子峰牛涛武巧玲郭佳李秋寒冯军陈斌李玉鹏吕宝锋赵青尼兴范然然杨业周娜徐伟张嘉琪宋春华陈波
Owner SHOUGANG CORPORATION