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Cold rolling process for LNG liquidation filling ship plate 4J36

A sheet and process technology, applied in the field of cold rolling, can solve the problems of high surface and plate shape requirements, low yield and other problems, and achieve the effects of high production efficiency, convenient operation and simple process

Active Publication Date: 2020-10-30
江苏圣珀新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]The casting and rolling process is a very important process in the 4J36 plate casting process, mainly including hot rolling and cold rolling. However, the current domestic 4J36 hot rolling and cold rolling process It is not yet mature, and because the plates used for LNG liquefaction injection ships have high requirements for surface and plate shape
Because there are a lot of oxides attached to the surface of hot rolled coils, the traditional casting and rolling process is raw material 5.0mm → rough rolling 2.4mm → grinding → annealing of semi-finished products → wire drawing → finishing rolling 1.2 → annealing, a large number of perforations appear during actual rolling As a result, it is very necessary to re-establish the relevant cold rolling process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1 provides a cold-rolling process for 4J36 plate for LNG liquefaction ship injection, which is characterized in that it includes the first pickling→hot coil grinding→rough rolling→grinding→second pickling→manual repairing Grinding→rolling→heat treatment→wire drawing→finish rolling; wherein the rough rolling deformation is 25%; the rolling deformation is 30%; and the finishing rolling deformation is 45%.

[0023] The pickling solutions used in the first pickling and the second pickling are all independently made of the following raw materials in parts by weight: 6 parts of amidinothiourea, 2,5-dithiobiurea 3 parts, 4 parts of polypropylene glycol, 1 part of lecithin, 70-80 parts of water.

[0024] The heat treatment specifically includes: coiling the rolled cast slab in a temperature range of 850° C. to form a crude product, and then keeping the temperature in a molten salt bath at 550° C. for 80 seconds; and then lead quenching treatment.

[0025] The lead q...

Embodiment 2

[0027] Embodiment 2 provides a cold-rolling process for LNG liquefaction ship injection plate 4J36 plate, which is basically the same as Embodiment 1, the difference is that the rough rolling deformation is 27%; the rolling deformation is 30.5% ; The finish rolling deformation is 48%; The pickling liquid used in the first pickling and the second pickling is all independently made of the following raw materials in parts by weight: 7 parts in amidine thiourea , 3.5 parts of 2,5-dithiobiurea, 5 parts of polypropylene glycol, 1.5 parts of lecithin, and 73 parts of water; the heat treatment is specifically: coiling the rolled cast slab in a temperature range of 890°C to form a crude product , and then kept at a constant temperature for 90 seconds in a molten salt tank at 590° C.; then lead quenching treatment; the lead quenching treatment temperature was cooled from 930° C. to 850° C., and the cooling rate was 22° C. / s.

Embodiment 3

[0029] Embodiment 3 provides a cold rolling process for LNG liquefaction ship injection plate 4J36 plate, which is basically the same as Embodiment 1, the difference is that the rough rolling deformation is 30%; the rolling deformation is 31% The deformation of the finish rolling is 50%; the pickling liquid used in the first pickling and the second pickling is all independently made of the following raw materials in parts by weight: 8 parts of amidine thiourea , 4 parts of 2,5-dithiobiurea, 5.5 parts of polypropylene glycol, 2 parts of lecithin, and 75 parts of water; the heat treatment is specifically: coiling the rolled cast slab at a temperature of 920°C to form a crude product , and then kept at a constant temperature for 100 seconds in a molten salt tank at 620°C; then lead quenching treatment; the lead quenching treatment temperature was cooled from 930°C to 850°C, and the cooling rate was 25°C / s.

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Abstract

The invention discloses a cold rolling process for an LNG liquidation filling ship plate 4J36. The cold rolling process is characterized by sequentially comprises the steps of primary pickling, hot roll coping, rough rolling, coping, secondary pickling, manual coping, rolling, heat treatment, drawing and finis rolling, wherein the rough rolling deformation is 25%-35%, the rolling deformation is 30%-32%, and the finish rolling deformation is 45%-55%. The invention further discloses the LNG liquidation filling ship plate 4J36 prepared by the cold rolling process. According to the cold rolling process for the LNG liquidation filling ship plate 4J36, hot roll coping treatment is carried out on a product in the raw material stage, multi-pass pressing is matched with a surface drawing process, the defect of oxide inclusion is removed, and the effect of smoothing the surface is achieved; and the cold rolling process is simple in flow, convenient to operate, high in production efficiency and suitable for continuous large-scale production.

Description

technical field [0001] The invention belongs to the technical field of alloy material processing, and in particular relates to a cold rolling process for a 4J36 plate used for LNG liquefaction and injection into ships. Background technique [0002] LNG (liquefied natural gas, liquefied natural gas), as an emerging marine fuel, is gradually showing broad prospects by virtue of its low-carbon, environmental protection, and economic advantages. It is a very clean energy source, colorless, odorless, non-toxic and non-corrosive. The advantages of using LNG include, but are not limited to, safety and reliability: the ignition point of LNG is 230°C higher than gasoline, higher than diesel, its explosion limit is 2.5 to 4.7 times higher than gasoline, and its relative density is about 0.47, while gasoline is about 0.7. It is lighter than air, and even if there is a slight leakage, it will quickly volatilize and spread, so that it will not spontaneously ignite and explode or form a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/02B21B1/22C21D8/02
CPCB21C37/02B21B1/22C21D8/0236C21D8/0205C21D8/0247
Inventor 周卫国
Owner 江苏圣珀新材料科技有限公司
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