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A rolling method of hot-rolled high-strength steel

A high-strength steel and rolling force technology, applied in the rolling field of hot-rolled high-strength steel, can solve the problems of affecting rolling stability, increasing production costs, and large rolling load, so as to improve rolling stability and increase production Efficiency and effect of reducing rolling load

Active Publication Date: 2020-03-27
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high strength of hot-rolled high-strength steel, generally above 345MPa, the rolling load is large, and the process control requirements for finish rolling are higher. Steel pile accidents are prone to occur during the rolling process, which affects rolling stability and increases production costs. , causing major economic losses

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Strip model: 490CL, strip specification: 2.8*1450mm.

[0036] The rolling method of the hot-rolled high-strength steel in this embodiment specifically includes: in the finish rolling process, the thickness of the intermediate billet is reduced from 32mm to 30mm; The actual rolling force of F7) is stable at 11000-12000kN, and the rolling force distribution of the rest of the rolling mills is distributed according to the conventional load distribution method. The specific rolling force distribution of each rolling mill is shown in Table 1:

[0037] Table 1 Distribution of rolling force in each rolling mill

[0038] rolling mill F1 F2 F3 F4 F5 F6 F7 Rolling force / kN 23605 22425 21481 19356 16095 13453 11329 Roll gap / mm 18.29 10.76 6.93 4.69 4.00 3.65 3.40 speed / m / s 1.38 2.25 3.43 5.03 6.66 8.13 9.37 Rolling temperature / ℃ 1062 1026 995 978 961 941 918

[0039] After adopting the above method, the rolling p...

Embodiment 2

[0041] Strip model: S750L, strip specification: 3.0*1500mm.

[0042] The rolling method of the hot-rolled high-strength steel in this embodiment specifically includes: in the finish rolling process, the thickness of the intermediate billet is reduced from 42mm to 39mm; ) is stable at 13000-14000kN, and the rolling force distribution of the rest of the rolling mills is distributed according to the conventional load distribution method. The specific rolling force distribution of each rolling mill is shown in Table 2:

[0043] Table 2 Distribution of rolling force in each rolling mill

[0044] rolling mill F1 F2 F3 F4 F5 F6 F7 Rolling force / kN 36419 35845 32233 26975 22703 19769 13500 Roll gap / mm 18.72 12.48 8.61 6.54 5.45 4.86 4.40 speed / m / s 2.03 3.05 4.54 6.24 8.15 9.89 11.46 Rolling temperature / ℃ 1051 1019 999 988 976 963 948

[0045] After adopting the above method, the rolling process was stable and no roll...

Embodiment 3

[0047]Strip model: H420LA, strip specification: 3.0*1488mm.

[0048] The rolling method of the hot-rolled high-strength steel in this embodiment specifically includes: in the finish rolling process, the thickness of the intermediate billet is reduced from 38mm to 36mm; The actual rolling force of F7) is stable at about 13000kN, and the rolling force distribution of the rest of the rolling mills is distributed according to the conventional load distribution method. The specific rolling force distribution of each rolling mill is shown in Table 3:

[0049] Table 3 Distribution of rolling force in each rolling mill

[0050] rolling mill F1 F2 F3 F4 F5 F6 F7 Rolling force / kN 31433 32469 30914 29187 25045 20954 12987 Roll gap / mm 19.40 11.81 7.73 5.41 4.07 3.60 3.33 speed / m / s 1.17 1.83 2.76 3.95 5.54 7.08 8.47 Rolling temperature / ℃ 1006 981 966 951 935 919 900

[0051] After adopting the above method, the rolling pr...

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Abstract

The invention discloses a rolling method of hot-rolled high-strength steel and belongs to the technical field of rolled steel. The method comprises the steps that when hot-rolled plate blanks are rolled, the thickness of an intermediate blank is lowered by 1-3 mm on the basis of an original set value; the roll gap adjustment of a last rolling mill is controlled to be -0.2 mm to +1.1 mm; and the actual rolling force of the last rolling mill is set to be lower than 15000 kN. The method is adopted for controlling the finish rolling process, the high-strength steel rolling stability can be improved, rolling accidents are reduced, thus, stable production is ensured, the production efficiency is improved, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a rolling method of hot-rolled high-strength steel. Background technique [0002] In the metallurgical industry, the hot rolling sheet process generally includes heating, rough rolling, flying shear, finishing rolling, coiling, etc. After the slab is heated, it is rolled by the roughing mill to become an intermediate slab for the finishing mill. The intermediate slab goes through the flying shear head and tail cutting, and then is rolled by the finishing mill to the thickness of the finished product required by the user. Among them, finish rolling affects various control indicators of finished products and is one of the most critical processes. [0003] With the increasing pressure of market competition, new varieties of high-strength series (high-strength structure, high-strength cold-rolled material) have been continuously developed to enhance market competitiveness. At...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/16B21B37/58B21B1/26
CPCB21B1/26B21B37/16B21B37/58B21B2261/04B21B2265/12B21B2271/02
Inventor 陈永平张泽鹏艾矫健彭振伟谭志福荣彦明王章岭周旬
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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