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Annealing self-weight straightening method for P5 alloy steel continuous casting round billet

A technology for continuous casting of round billets and alloy steels, applied in the field of round billet steel straightening, can solve the problems of waste of energy consumption and increased cost, and achieve the effects of prolonging the soaking time, saving costs, and reducing the scrap amount of sawing.

Active Publication Date: 2019-05-21
JIANGSU LIHUAI IRON AND STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process requires that when the P5 alloy steel continuous casting round billet is prepared, it needs to be manufactured into a continuous casting round billet with a larger length, but the round billet must be sawed when preparing steel pipes.
lead to waste of energy consumption and increase of cost

Method used

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  • Annealing self-weight straightening method for P5 alloy steel continuous casting round billet
  • Annealing self-weight straightening method for P5 alloy steel continuous casting round billet
  • Annealing self-weight straightening method for P5 alloy steel continuous casting round billet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Such as Figure 5 Shown, a kind of diameter of the present invention is the method for P5 alloy steel continuous casting round slab annealing self-weight straightening of 500 millimeters, comprises the following steps:

[0052] 1) Take the two pad irons 10 symmetrically set on the trolley-type annealing furnace 8 with the central axis as the axis of symmetry as a group, measure the distance between each group of pad irons 10, and measure the distance between the two ends of the round billet 1 respectively. The symmetrical mark has a horn position marking circle 2, and the distance between the horn position marking rings 2 is equal to the distance between a group of symmetrical horns 10 on the trolley type annealing furnace 8, and the distance between the symmetrical horns 10 of the group is equal. The spacing between them is the set of symmetrical horns 10 which are smaller than the maximum spacing in the actual length of the round billet 1;

[0053] 2) Fork up the two...

Embodiment 2

[0078] Such as Image 6 Shown, a kind of diameter of the present invention is the method for P5 alloy steel continuous casting round slab annealing self-weight straightening of 450 millimeters, except that the holding time of soaking is 30 hours, and the furnace temperature reduction speed of trolley type annealing furnace 8 is Except for 25° C. / hour, the rest of the process scheme is exactly the same as that of Example 1.

Embodiment 3

[0080] Such as Figure 7 Shown, a kind of diameter of the present invention is the method for P5 alloy steel continuous casting round slab annealing self-weight straightening of 380 millimeters, except that the holding time of soaking is 27 hours, and the furnace temperature reduction speed of trolley type annealing furnace 8 is Except for 32° C. / hour, the rest of the process scheme is exactly the same as that of Example 1.

[0081] The curvature of each round billet 1 in Examples 1 to 3 before annealing and the curvature after annealing, straightening and cooling were measured and calculated, and compared. get as Figure 8 The bending degree of the round billet shown (the bending degree of the continuous casting round billet is required to be ≤0.60%). Depend on Figure 8 It can be seen that the curvature of each round billet after annealing and straightening meets the requirements. And the straightening effect of the round billet with larger diameter is better.

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Abstract

The invention discloses an annealing self-weight straightening method for a P5 alloy steel continuous casting round billet. The annealing self-weight straightening method for the P5 alloy steel continuous casting round billet comprises the steps that the two ends of the round billet are lifted up, and the round billet is rotated to enable a bent portion to face upwards through a lifting rope arranged in the middle of the round billet; and then the round billet is put on a trolley type annealing furnace, the soaking time is prolonged when annealing is conducted, it is guaranteed that the cooling speed of the trolley type annealing furnace is within the range from 25 DEG C / h to 35 DEG C / h, and when the temperature reaches 200 DEG C, the round billet is taken out of the furnace and air-cooledto the room temperature. According to the annealing self-weight straightening method for the P5 alloy steel continuous casting round billet, the bent round billet achieves automatic straightening under the action of the self weight through an annealing technology, no additional straightening technology is needed, the saw cutting scrap amount of the P5 continuous casting round billet is decreased,the cost is reduced, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of round billet steel straightening, in particular to a self-weight straightening method for P5 alloy steel continuous casting round billet annealing. Background technique [0002] P5 alloy steel pipe is an alloy structural steel made by hot rolling process. It is prepared from P5 alloy steel continuous casting round billet. P5 alloy steel continuous casting round billet has high temperature sensitivity and large cooling internal stress, which easily leads to excessive bending and cannot be repaired by mechanical straightening. It can only be sawed and scrapped, which seriously affects the product qualification rate and user use. At present, for the P5 continuous casting round billets with excessive bending, the conventional annealing process has no effect on the bending. Some enterprises directly saw the end of the P5 alloy steel continuous casting round billet, so that the curvature of the round billet m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D3/00C21D1/26
Inventor 左辉郑力宁李鹏强石可伟葛盼亚
Owner JIANGSU LIHUAI IRON AND STEEL CO LTD
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