Method for producing extra thick composite board through dissymmetrical composite rolling

A composite rolling and asymmetric technology, applied in metal rolling and other directions, can solve the problems affecting the composite quality of the bonding surface, and achieve the effect of improving bonding efficiency and bonding effect, improving deformation, and increasing the degree of recrystallization

Active Publication Date: 2012-08-29
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the further increase of the thickness of the composite slab, the deformation of the core...

Method used

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  • Method for producing extra thick composite board through dissymmetrical composite rolling
  • Method for producing extra thick composite board through dissymmetrical composite rolling
  • Method for producing extra thick composite board through dissymmetrical composite rolling

Examples

Experimental program
Comparison scheme
Effect test

test approach 1

[0040] The thickness of the three-layer billet is 720mm in total, and the 300mm thick plate is produced.

[0041] Prepare three slabs, the thickness is 240mm+240mm+240mm, the total thickness is 720mm, and the composite layer is located at 1 / 3 of the full thickness.

[0042] Surface cleaning is carried out on the combined surfaces of the three slabs, and then vacuum welding is carried out. Put the welded composite billet into the heating furnace and heat it to 1230°C, and start rolling after holding the heat for 5 hours. The rolling start temperature is 1190°C, the reduction range of each pass is 15-30mm, and the final rolling temperature is 1100°C.

[0043] For the composite thick plate after rolling, the flaw detection is carried out according to the "National Standard of the People's Republic of China - Ultrasonic Inspection Method for Thick Steel Plate GB / T 2970-2004", which meets the second-level standard of the national standard.

test approach 2

[0045] The total thickness of the double-layer unequal thickness billet is 720mm, and the thick plate of 360mm is produced.

[0046] In order to compare with the traditional scheme, three groups of composite billets are prepared. There are two steel plates in each group, and the thickness of each steel plate is controlled so that the composite layer is located at different positions in the thickness direction.

[0047] The composite layer of the first group (comparative example) is at 1 / 2 of the full thickness, and the thickness of the two steel plates is 360mm+360mm, that is, the traditional configuration of two steel plates of equal thickness, so as to compare the test results.

[0048] The composite layer of the second group (embodiment) is at 1 / 3 of the full thickness, and the thickness of the two steel plates is 240mm+480mm.

[0049] The composite layer of the third group (embodiment) is located at 1 / 5 of the full thickness, and the thickness of the two steel plates is 1...

test approach 3

[0057] The total thickness of the double-layer unequal thickness billet is 600mm, and it is rolled in a single pass.

[0058] The composite layer of the first group (comparative example) is at 1 / 2 of the full thickness, and the thickness of the two steel plates is 300mm+300mm, which is the traditional configuration of two equal-thickness steel plates, so as to compare the experimental results.

[0059] The composite layer of the second group (the embodiment of the present invention) is at 1 / 3 of the full thickness, and the thickness of the two steel plates is 200mm+400mm.

[0060] The composite layer of the third group (the embodiment of the present invention) is located at 1 / 5 of the full thickness, and the thickness of the two steel plates is 120mm+480mm.

[0061] The above-mentioned groups of steel plates are surface-cleaned and vacuum-welded to form a composite billet. The composite billet is placed in a heating furnace and heated to 1150°C, and then kept for 4 hours befor...

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Abstract

A method for producing extra thick composite board through dissymmetrical composite rolling comprises the following steps: a), board preparation: three slabs including a first slab, a second slab and a third slab are prepared, and the combined surfaces of the three slabs are subjected to surface cleaning, the thicknesses H1, H2 and H3 of the first slab, the second slab and the third slab meet the following requirement: the total thickness H: H1+H2+H3 is larger than 600 mm, 1/5 <H1/H <1/2, 1/5 <H3/H ,1/2; b), vacuum welding: the peripheries of the combined surfaces of the three slabs are welded under the vacuum environment, and the peripheries of the combined surfaces are sealed; c), heating: the heating temperature is 1100 DEG C to 1250 DEG C, and the temperature holding time is larger than 4 hours; and d), rolling: the bloom rolling temperature is 1000 DEG C to 1200 DEG C, the finishing rolling temperature is within recrystallization temperature, and the reduction in pass is 5 to 60 mm. According to the invention, the combined interfaces are placed at the positions of a half to one fifth of thicknesses of the slabs, the combined surfaces of the slabs are deformed greatly, and recrystallization is performed near the combined surfaces to a greater degree, so that composite quality of good combination is obtained.

Description

technical field [0001] The invention relates to the manufacturing technology of composite thick plates, in particular to a method for producing extra-thick composite plates by asymmetrical composite rolling. Background technique [0002] The manufacturing method of the extra-thick plate, such as the Japanese invention JP2005-152998A disclosed "ultra-thick steel plate and its manufacturing method", JP2005-177817A "ultra-thick steel plate manufacturing method" and JP2005-297013A "extremely thick steel plate and its manufacturing method" . These patents have all adopted a consistent scheme, that is, by stacking two or more steel plates of equal thickness, welding and sealing around the contact surface, and then heating and rolling the slab. [0003] In the above patent, the deformation parameters of the composite slab during rolling are calculated by the following formula: [0004] Seff=∑[(σtc max / k 0 )-1] [0005] ∑ represents the sum of deformation parameters of each pass...

Claims

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Application Information

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IPC IPC(8): B21B1/38
Inventor 袁向前苗雨川焦四海白岩鲁志政孔伟
Owner BAOSHAN IRON & STEEL CO LTD
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