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Vanadium-containing hot rolled steel plate and preparation method thereof

A hot-rolled steel plate and slab technology, applied in the field of vanadium-containing hot-rolled steel plate and its preparation, can solve the problems of inconvenient steel plate welding, increased production organization, low-alloy steel performance, etc., to improve production efficiency, reduce alloy addition, Reduce the effect of mixing

Inactive Publication Date: 2008-04-30
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the market has great demand for low-alloy structural steel plates with yield strength ReL≥350MPa, ReL≥400MPa and ReL≥450MPa. Hot-rolled steel plates often use different chemical compositions, which not only increases the difficulty of the production organization of the smelting and rolling process, but also brings inconvenience to the welding between the steel plates

Method used

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  • Vanadium-containing hot rolled steel plate and preparation method thereof
  • Vanadium-containing hot rolled steel plate and preparation method thereof
  • Vanadium-containing hot rolled steel plate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1 Production of continuous casting slab

[0037] Produce alloy steel with chemical composition weight percentage of C: 0.06%~0.10%, Si: ≤0.30%, Mn: 1.05%~1.25%, V: 0.04%~0.07%, P: ≤0.025%, S: ≤0.015% , Cast it into a continuous casting slab of 200mm×(900~1300)mm×11000mm by conventional continuous casting method. A total of 5 batches of continuous casting slabs were produced, with numbers 1, 2, 3, 4, and 5 respectively. The chemical composition of each batch is determined in Table 1.

[0038] Table 1 Determination results of chemical composition of continuous casting slab (%) (The balance is iron and inevitable impurities)

[0039] serial number

Embodiment 2

[0040] Example 2 Preparation of hot-rolled steel sheet with a yield strength ReL of 350MPa~410MPa

[0041] The continuous casting slab produced in Example 1 was heated to 1230°C to 1250°C for rough rolling. After the rough rolling, the thickness of the intermediate slab was 32mm to 34mm, and it was coiled in a coreless transfer hot coil box; the finishing rolling temperature was controlled at 1000℃~1040℃; the thickness of the first pass of finishing rolling is 20~23mm, the thickness of the second pass is 13~15mm, the thickness of the third pass is 10~12mm, and the thickness of the finished product is 3~7mm; The final rolling temperature range is 870℃~900℃; after rolling, laminar cooling is cooled from 870℃~900℃ to the coiling temperature range of 660℃~700℃ at an average cooling rate of 8.5~20.0℃ / s, and then sent after cooling. The finishing line performs leveling and sub-rolling. The rolling process parameters and finished product properties are shown in Table 2 and Table 3.

[00...

Embodiment 3

[0046] Example 3 Preparation of hot-rolled steel sheet with a yield strength ReL of 400MPa~480MPa

[0047] The continuous casting slab produced in Example 1 was heated to 1230°C to 1250°C for rough rolling. After the rough rolling, the thickness of the intermediate slab was 35mm to 37mm, and it was coiled in a coreless transfer hot coil box; the finishing rolling temperature was controlled at 970℃~1000℃; the thickness of the first pass of finishing rolling is 21~24mm, the thickness of the second pass is 14~16mm, the thickness of the third pass is 10~12mm, and the thickness of the finished product is 3~7mm; The final rolling temperature range is 850℃~880℃; after rolling, laminar cooling is cooled from 850℃~880℃ to the coiling temperature range of 630℃~660℃ at an average cooling rate of 8.5~20.0℃ / s, and then sent after cooling. The finishing line performs leveling and sub-rolling. The rolling process parameters and finished product properties are shown in Table 4 and Table 5.

[0048]...

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Abstract

The invention relates to a vanadium-bearing hot rolled steel plate and the preparation method thereof, and belongs to the metallurgy field. The invention solves the technical difficult problem that the steel plates of various mechanical properties can not be produced with the identical continuous casting plate blank. The chemical components of the vanadium-bearing hot rolled steel plate of the invention has the mass percentage that: C occupies 0.06 to 0.12 percent, Si is lower than or equal to 0.30 percent, Mn occupies 0.90 to 1.40 percent, V occupies 0.02 to 0.10 percent, P is lower than or equal to 0.025 percent, S is lower than or equal to 0.015 percent, and the residual is Fe and inevitable foreign impurities; the content of ferrolites in the vanadium-bearing hot rolled steel plate is 71 to 89 percent, the content of pearlite is 11 to 29 percent, and the crystal grain size of the ferrolites is 5 to 16 micrometers. The preparation method of the vanadium-bearing hot rolled steel plate of the invention comprises the steps of heating, rough rolling, precision rolling, final rolling, and balling. The vanadium-bearing hot rolled steel plate of the invention can be used for the manufacture of structural parts of the cross beam of a vehicle, a vehicle wheel, a construction structure and an engineering machinery.

Description

Technical field [0001] The invention relates to a vanadium-containing hot rolled steel plate and a preparation method thereof, and belongs to the field of metallurgy. Background technique [0002] Structural hot-rolled steel plate is the most widely used and most used steel material in the plate and strip products. It is mainly used for automobile structures, engineering machinery, building structures and other general structural parts. According to the steel type, it is usually divided into carbon structural steel. And low-alloy structural steel. Microalloying elements such as vanadium, titanium, and niobium are often added to low-alloy structural steels, and through suitable hot-rolling controlled rolling and controlled cooling processes, hot-rolled steel sheets with better strength and toughness are produced. [0003] At present, the market has a large demand for low-alloy structural steel plates with yield strengths of ReL≥350MPa, ReL≥400MPa and ReL≥450MPa. Due to the limitat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C21D8/02B21B37/00
CPCY02P10/20
Inventor 左军常军张开华刘勇程兴德李正荣佘广夫王敏莉
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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