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Method for rolling large circular steel by primary rolling mill

A blooming mill and round steel technology, applied in metal rolling, metal rolling, rolls, etc., to expand the range of product series, increase the commonality of rolls, and reduce production costs

Active Publication Date: 2008-04-23
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical problem to be solved is how to design the height-to-width ratio of the rolled piece according to the characteristics of rolling deformation, so as to ensure the stability of rolling the elliptical rolled piece into the round hole.

Method used

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  • Method for rolling large circular steel by primary rolling mill
  • Method for rolling large circular steel by primary rolling mill
  • Method for rolling large circular steel by primary rolling mill

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1, with reference to figure 1 , 2 , Rolling of Ф250 medium carbon steel 42CrMo, the roll pass design of the preliminary rolling mill is: the pass arrangement order on the roll 7 is 1# box hole 1, 2# box hole 2, 2# round hole 3, 2# oval hole 4 , 1# round hole 5, 1# oval hole 6, the roll can carry out the rolling of two kinds of large round steel. The rolling procedure is shown in Table 1:

[0017] Table 1: Ф250 round steel reduction rules (rectangular billet 340×260)

[0018]

[0019] The dimensional accuracy of the round steel can be controlled within ±4mm, which fully meets the requirements of the forging industry or machining industry.

Embodiment 2

[0020] Example 2, the rolling of Ф300 medium carbon steel 42CrMo, the rolling procedure is shown in Table 2: the dimensional accuracy of the round steel can be controlled within ±5mm, and the rest is the same as that of Example 1.

[0021] Table 2: Ф300 round steel reduction rules (rectangular billet 400×310)

[0022]

Embodiment 3

[0023] Example 3, the rolling of Ф350 medium carbon steel 42CrMo, the rolling procedure is shown in Table 3: the dimensional accuracy of the round steel can be controlled within ±5mm, and the rest is the same as that of Example 1.

[0024] Table 3: Ф350 round steel reduction rules (rectangular billet 440×360)

[0025]

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Abstract

A technology for rolling the big circular steel by blooming mill features that one or more series' of passes for one or more specifications of circular steel are designed on a single roller. Said passes may be rectangular, elliptical, and circular.

Description

Technical field: [0001] The invention relates to a method for rolling a large round steel, in particular to a method for rolling a large round steel by using a blooming mill. Background technique: [0002] The general technology of round steel rolling is to turn different passes on the rolls, and complete the axial staggered rolling of a series of passes on multiple racks. The general round steel rolling pass system mainly includes "box-square- - Ellipse - circle" or "box - square - hexagonal square - circle" pass system. And the general rolling technology is rolling by a continuous rolling mill with multiple stands arranged in series. Due to the limitation of the strength of the stand, the maximum size of the round steel rolled by the general continuous rolling mill is within Ф200mm, even a small amount can be For the continuous rolling mill for rolling large round steel, in order to ensure the rolling stability, especially the rolling stability when the elliptical rolled ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/08B21B1/02B21B27/02
Inventor 陈林杨霄唐劲松
Owner BAOSHAN IRON & STEEL CO LTD
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