Die casting method for 70t-grade forged 12Cr2Mo1R (H) steel ingot

A 12cr2mo1r, die-casting technology, applied in the field of metallurgy, can solve the problems of easy slag coiling, large structural stress and thermal stress, affecting production and delivery, etc., to achieve the effect of improving internal quality, reducing head looseness, and easy operation.

Inactive Publication Date: 2021-05-07
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 12Cr2Mo1R (H) steel alloy content is high, the fluidity of molten steel is poor, it is difficult for inclusions to float up, it is easier to roll slag, and inclusions are easy to deposit and accumulate at the tail of the ingot
Generally, 12Cr2Mo1R (H) tends to produce hard and brittle structures such as bainite during the cooling process of steel ingots, which causes large structural stress and thermal stress in the steel, and is prone to various types of cracks, resulting in the scrapping of billets, steel plates or finished products. Problems such as surface quality affect production delivery and increase production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The mold casting method of the 70t grade forged 12Cr2Mo1R(H) steel ingot in this embodiment includes the steps of mold flux selection, pouring superheat control, pouring speed control, protective pouring control, and annealing control. The specific process steps are as follows:

[0019] (1) Mold flux selection process, using low-carbon mold flux, low-carbon mold flux hemispherical point temperature 1150 ℃;

[0020] (2) The pouring superheat control process, the pouring superheat of the forged ingot is controlled at 46°C;

[0021] (3) In the pouring speed control process, the aperture of the pouring nozzle is 45mm, the pouring time of the main body is 22min, and the pouring time of the cap mouth is 8min;

[0022] (4) Describe the protective pouring control process, fully sealed protective pouring, the molten steel is completely isolated from the air during the pouring process; the pouring is demoulded for 24 hours, and the annealing furnace is installed in time for annea...

Embodiment 2

[0028] The mold casting method of the 70t grade forged 12Cr2Mo1R(H) steel ingot in this embodiment includes the steps of mold flux selection, pouring superheat control, pouring speed control, protective pouring control, and annealing control. The specific process steps are as follows:

[0029] (1) Mold flux selection process, using low-carbon mold flux, low-carbon mold flux hemispherical point temperature 1120 ℃;

[0030] (2) The pouring superheat control process, the pouring superheat of the forged ingot is controlled at 47°C;

[0031] (3) In the pouring speed control process, the aperture of the pouring nozzle is 45mm, the pouring time of the main body is 24min, and the pouring time of the cap mouth is 9min;

[0032] (4) Describe the protective pouring control process, fully sealed protective pouring, the molten steel is completely isolated from the air during the pouring process; demoulding after pouring for 26 hours, and annealing in an annealing furnace after demoulding; ...

Embodiment 3

[0038] The mold casting method of the 70t grade forged 12Cr2Mo1R(H) steel ingot in this embodiment includes the steps of mold flux selection, pouring superheat control, pouring speed control, protective pouring control, and annealing control. The specific process steps are as follows:

[0039] (1) Mold flux selection process, using low-carbon mold flux, low-carbon mold flux hemispherical point temperature 1170 ℃;

[0040] (2) The pouring superheat control process, the pouring superheat of the forged ingot is controlled at 48°C;

[0041] (3) In the pouring speed control process, the aperture of the pouring nozzle is 45mm, the pouring time of the main body is 26min, and the pouring time of the cap mouth is 10min;

[0042] (4) Describe the protective pouring control process, fully sealed protective pouring, the molten steel is completely isolated from the air during the pouring process; demoulding after pouring for 25 hours, and annealing in an annealing furnace after demoulding;...

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Abstract

The invention discloses a die casting method for a 70t-grade forged 12Cr2Mo1R (H) steel ingot. The die casting method comprises the working procedures of casting powder selection, casting superheat degree control, casting speed control, protective casting control and annealing control. The method is easy and convenient to operate, the internal quality of the steel ingot can be improved, the defects of looseness, shrinkage cavities and the like of the head of the steel ingot can be reduced, cracks on the surface of the steel ingot can be prevented, waste products caused by the crack defects of the 70t-grade forged 12Cr2Mo1R (H) steel ingot are reduced, a steel plate rolled by producing the forging ingot meets the NB / T47013.3-2015 acceptance level Level T1 level, the flaw detection qualification rate is larger than or equal to 98.2%, and the steel ingot is free of the crack defects.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a die-casting method for forging 12Cr2Mo1R (H) steel ingots of 70t grade. Background technique [0002] 12Cr2Mo1R (H) steel has good high temperature resistance, high pressure resistance, corrosion resistance, and hydrogen resistance. It is often used in the manufacture of hot and high pressure separators, hydrogenation reactors and other equipment. Due to the harsh operating environment of the equipment, it is required that the steel plate of the manufacturing equipment not only To have excellent mechanical properties and internal quality, steel plates are also required to have good surface quality. With the development of petrochemical projects, large-scale equipment, intensification, and greening are the major development trends. The upgrading of equipment will inevitably lead to the improvement of the quality of steel used in equipment. Steel plates are develop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D7/00B22D46/00B22D1/00C21D1/26C21D6/00C21D11/00
CPCB22D1/00B22D7/00B22D46/00C21D1/26C21D6/002C21D11/00
Inventor 甄光楠夏保卫
Owner WUYANG IRON & STEEL
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