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Dendritic crystal corrosive liquid for precipitated reinforced martensitic stainless steel and use method thereof

A martensitic stainless steel, precipitation strengthening technology, applied in the direction of weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., can solve the problem of inability to corrode dendritic structure, precipitation strengthening martensitic stainless steel seed dendritic corrosion effect is not good , heating and insulation problems, etc.

Active Publication Date: 2019-02-01
TIANJIN HEAVY EQUIP ENG RES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this corrosion method takes a long time to prepare, requires heating and heat preservation, and has a poor effect on dendritic corrosion of precipitation-strengthened martensitic stainless steel species.
Another corrosion method about hydrochloric acid electrolysis can not corrode the dendrite structure of precipitation strengthened martensitic stainless steel

Method used

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  • Dendritic crystal corrosive liquid for precipitated reinforced martensitic stainless steel and use method thereof
  • Dendritic crystal corrosive liquid for precipitated reinforced martensitic stainless steel and use method thereof
  • Dendritic crystal corrosive liquid for precipitated reinforced martensitic stainless steel and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0036] This embodiment is used to precipitate and strengthen the dendrite corrosion solution of martensitic stainless steel as cast. The composition and proportion are: 2.5 g of sodium metabisulfite, 5 ml of analytically pure hydrochloric acid, 3 ml of analytically pure nitric acid, and 75 ml of water; the mass fraction of hydrochloric acid is 36 ~38%, the mass fraction of nitric acid is 65~68%.

[0037] The precipitation strengthened martensitic stainless steel in this example is 15-5PH steel.

[0038] This embodiment is used to precipitate and strengthen the method for using the dendrite corrosion solution in the as-cast state of martensitic stainless steel, comprising the following steps:

[0039] (1) Prepare the detection sample of precipitation strengthening martensitic stainless steel as-cast state: carry out coarse grinding, fine grinding, polishing, cleaning (water or alcohol) and drying of the detection sample;

[0040] (2) Preparation of dendrite corrosion solution:...

Embodiment 1-2

[0045] This embodiment is used to precipitate and strengthen the dendritic corrosion solution of martensitic stainless steel as cast. The composition and proportion are: 2.8 g of sodium metabisulfite, 6 ml of analytically pure hydrochloric acid, 4 ml of analytically pure nitric acid, and 75 ml of water; the mass fraction of hydrochloric acid is 36 ~38%, the mass fraction of nitric acid is 65~68%.

[0046] The precipitation strengthened martensitic stainless steel in this example is 15-5PH steel.

[0047] This embodiment is used to precipitate and strengthen the method for using the dendrite corrosion solution in the as-cast state of martensitic stainless steel, comprising the following steps:

[0048](1) Prepare the detection sample of precipitation strengthening martensitic stainless steel as-cast state: carry out coarse grinding, fine grinding, polishing, cleaning (water or alcohol) and drying of the detection sample;

[0049] (2) Preparation of dendrite corrosion solution ...

Embodiment 1-3

[0053] This embodiment is used to precipitate and strengthen the dendritic corrosion solution of martensitic stainless steel as cast. The composition and proportion are: 2.8 g of sodium metabisulfite, 6 ml of analytically pure hydrochloric acid, 4 ml of analytically pure nitric acid, and 75 ml of water; the mass fraction of hydrochloric acid is 36 ~38%, the mass fraction of nitric acid is 65~68%.

[0054] The precipitation strengthened martensitic stainless steel in this example is 15-5PH steel.

[0055] This embodiment is used to precipitate and strengthen the method for using the dendrite corrosion solution in the as-cast state of martensitic stainless steel, comprising the following steps:

[0056] (1) Prepare the detection sample of precipitation strengthening martensitic stainless steel as-cast state: carry out coarse grinding, fine grinding, polishing, cleaning (water or alcohol) and drying of the detection sample;

[0057] (2) Preparation of dendrite corrosion solution...

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Abstract

The invention relates to dendritic crystal corrosive liquid for precipitated reinforced martensitic stainless steel and a use method thereof, and belongs to the technical field of continuous casting steel metallographic analysis. According to the formula, the dendritic crystal corrosive liquid comprises 2 to 4 g of sodium metabisulfite, 5 to 8 ml of hydrochloric acid, 2 to 4 ml of nitric acid, and75 ml of distilled water; the sodium metabisulfite, the distilled water, the hydrochloric acid, and the nitric acid are sequentially added into a container, and are evenly stirred; during use, a detection sample polishing face is immersed in the corrosive liquid upwards, standing is carried out, and after the dendritic structure is displayed out, the corroded precipitatted reinforced martensiticstainless steel detection face is subjected to detection observation through an optical microscope or scanning electron microscope. The corrosive liquid can simply, conveniently and rapidly corrode out the clear dendritic structure of the precipitated reinforced martensitic stainless steel, the dendritic structure can be directly observed, the dendrite spacing is measured, and the corrosive liquidis used for evaluating the casting state structure quality of the precipitated reinforced martensitic stainless steel and assisting in evaluating the removing effect of homogenization heat treatmenton the dendritic segregation.

Description

technical field [0001] The invention belongs to the technical field of continuous casting steel metallographic analysis, and in particular relates to a dendrite corrosion solution for precipitation strengthening martensitic stainless steel and a method for using the same. Background technique [0002] The low-magnification inspection method of dendritic corrosion is a low-magnification inspection method for continuous casting slabs that has been increasingly perfected with the development of continuous casting technology. By observing the solidified dendrite structure of the continuous casting slab, it is possible to calculate the equiaxed crystal ratio, measure the skew angle of the columnar crystal and the distance between the secondary dendrite arms of the dendrite, and then infer the solidification condition. It creates favorable conditions for further analyzing the relevant information between the defects of the continuous casting slab and the solidification structure, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/28G01N17/00
CPCC23F1/28G01N17/006
Inventor 霍洁赵帅
Owner TIANJIN HEAVY EQUIP ENG RES
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