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A kind of hot-rolled hot-formed steel and its preparation method

A hot forming steel and hot forming technology, applied in the field of high-strength steel for automobiles, can solve the problems of high cost, long production process and high energy consumption, and achieve the effect of reducing the opportunity of introducing hydrogen, reducing the cost of hot stamping, and optimizing the process flow

Active Publication Date: 2021-12-21
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, 22MnB5 is mainly cold-rolled and annealed. The production process includes: smelting, refining, billet casting, rough rolling, finish rolling, coiling, leveling, pickling, cold rolling, continuous annealing and hot stamping quenching. There is a production process Long, high energy consumption, high cost and other issues have become a major factor limiting the wider application of hot-rolled hot-formed steel

Method used

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  • A kind of hot-rolled hot-formed steel and its preparation method
  • A kind of hot-rolled hot-formed steel and its preparation method
  • A kind of hot-rolled hot-formed steel and its preparation method

Examples

Experimental program
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Effect test

Embodiment approach

[0044] According to a typical embodiment of the present invention, a method for preparing hot-rolled hot-formed steel is also provided, including:

[0045] Obtain hot-rolled sheet;

[0046] performing hot forming and quenching simulation on the hot-rolled sheet to obtain hot-rolled hot-formed steel;

[0047] In the hot forming quenching simulation, the hot-rolled sheet is heated to 800°C-900°C and held for 2min-8min, and the quenching cooling rate is ≥40°C / s.

[0048] At present, the commonly used holding temperature for hot-rolled hot-forming steel is 930°C. The relatively low holding temperature of the present invention can avoid the growth of grains on the one hand, and save energy on the other hand. The cooling rate ≥ 40°C / s ensures that the final product with horsepower Hot-rolled hot-formed steel with a microstructure.

[0049] As some preferred embodiments, the thickness of the hot-rolled sheet is 1.2mm-3.0mm.

[0050] As some preferred implementations, the obtaining o...

Embodiment 4

[0064] This embodiment provides a method for preparing hot-rolled thermoformed steel, which is used to prepare hot-rolled thermoformed steel containing the chemical composition in Example 1, including:

[0065] S1: Obtain a slab with the chemical composition in Example 1;

[0066] S2: heating and keeping the cast slab sequentially, primary descaling, rough rolling, secondary descaling, finish rolling, laminar cooling, coiling and leveling to obtain a hot-rolled sheet;

[0067] In the heating and heat preservation, the billet is heated to 1220°C and held for 1 hour; the start rolling temperature of the rough rolling is 1140°C, and the total reduction rate of the rough rolling is 75%; the entrance temperature of the finishing rolling is 1040°C. ℃, the finish rolling temperature of the finishing rolling is 880 ℃; the coiling temperature is 650 ℃; the thickness of the hot-rolled sheet is 1.5mm;

[0068] S3: The hot-rolled sheet is subjected to a hot-forming quenching simulation t...

Embodiment 5

[0070] This embodiment provides a method for preparing hot-rolled thermoformed steel, which is used to prepare hot-rolled thermoformed steel containing the chemical composition in Example 2, including:

[0071] S1: Obtain a slab with the chemical composition in Example 2;

[0072] S2: heating and keeping the cast slab sequentially, primary descaling, rough rolling, secondary descaling, finish rolling, laminar cooling, coiling and leveling to obtain a hot-rolled sheet;

[0073] In the heating and heat preservation, the billet is heated to 1220°C and held for 1.5h; the start rolling temperature of the rough rolling is 1120°C, and the total reduction rate of the rough rolling is 73%; the entrance temperature of the finish rolling is 1035°C, the finish rolling temperature is 885°C; the coiling temperature is 630°C; the thickness of the hot-rolled sheet is 2.0mm;

[0074] S3: The hot-rolled thin plate is subjected to a hot-forming quenching simulation to obtain a hot-rolled hot-fo...

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Abstract

The invention specifically relates to a hot-rolled hot-formed steel and a preparation method thereof, belonging to the technical field of high-strength steel for automobiles. The chemical composition of the hot-rolled hot-formed steel is calculated by mass fraction: C: 0.18%-0.50%, Si: 0.3 %‑1.7%, Mn: 1.0%‑4.0%, Alt: 0.02%‑0.09%, Cr: 0.8%‑2.5%, P≤0.015%, S≤0.015%, B: 0.001‑0.012%, Mo: 0.03% ‑0.20%, Ti: 0.01%‑0.07%, Nb: 0.02%‑0.12%, and the rest are Fe and unavoidable impurity elements; the mechanical properties of the hot-rolled hot-formed steel provided by the embodiments of the present invention are: Rp0.2= 900MPa-1100MPa, Rm=1500MPa-2200MPa, A50=6%-12%; the yield strength of the hot-rolled sheet before thermoforming is 400MPa-700MPa, the tensile strength is 600MPa-1000MPa, and the elongation A50=15%-20%.

Description

technical field [0001] The invention belongs to the technical field of high-strength steel for automobiles, and in particular relates to a hot-rolled hot-formed steel and a preparation method thereof. Background technique [0002] With the development of industry, the world is facing the challenges of severe energy crisis and environmental pollution, and people's travel is more pursuing low energy consumption and safety. Not only does it need to produce higher strength and higher plasticity automotive steel plates to ensure the safety of people traveling, but also needs to be more green and efficient in the production of steel plates. [0003] Hot-rolled hot-formed steel is made from hot-rolled sheet through hot stamping process. As one of the steel plates with the highest strength in the automotive industry, hot-rolled hot-formed steel is increasingly favored by major OEMs and consumers. The hot-rolled hot-forming steel widely used at present is 22MnB5 type, and its tensil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/38C22C38/34C22C38/32C22C38/28C22C38/26C22C38/22C22C38/06C22C38/02C21D1/18C21D8/02
CPCC22C38/38C22C38/34C22C38/32C22C38/28C22C38/26C22C38/22C22C38/06C22C38/02C22C38/002C21D1/18C21D8/0205C21D8/0247C21D2211/005C21D2211/009
Inventor 梁江涛刘锟滕华湘李学涛曹荣华李飞田志红潘辉许斐范惠亚军李秋寒
Owner SHOUGANG CORPORATION
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