Austenitic stainless steel plate and manufacture method thereof

Abstract

The invention provides an austenitic stainless steel plate which is composed of the following chemical compositions in percentage by weight: less than or equal to 0.03% of C, 0.3-1.0 % of Si, 0.8-2.0% of Mn, less than or equal to 0.003% of S, less than or equal to 0.03 % of P, 16.0-20.0% of Cr, 10.0-14.0% of Ni, 1.0-3.0% of Mo, less than or equal to 0.08% of N, less than or equal to 0.004% of O, 0.005-0.01% of optional Ca and / or 0.001-0.003 % of optional B and the balance of Fe and other inevitable impurities, wherein the weight percentage of Ni, Mn, N, C, Cr, Mo and Si also satisfies that the content of ferrite delta in the steel plate is less than 3%. Correspondingly, the invention also provides a manufacture method of the austenitic stainless steel plate. By the technical scheme, the austenitic stainless steel plate of the invention has good surface quality and does not have the surface defects, such as liner scale, inclusion, peeling, crazes and the like.

Description

technical field

[0001] The invention relates to the field of stainless steel production, in particular to an austenitic stainless steel plate with good surface quality and a manufacturing method thereof. Background technique

[0002] Cr-Ni austenitic stainless steel is widely used in the fields of petroleum, chemical industry, pressure vessel, aerospace and energy due to its good ductility, cold and hot workability and good corrosion resistance at high and low temperatures.

[0003] Compared with Cr-Ni austenitic stainless steel, Cr-Ni-Mo austenitic stainless steel has better resistance to dilute sulfuric acid, phosphoric acid, acetic acid, formic acid, urea and chloride pitting resistance, so its cold rolled As a product with high corrosion resistance and high value-added, the plate has a wider range of uses, and is widely used in the chemical industry and pressure vessel industry, such as heat exchangers, tank linings, electrolytic anode plates, and pipe making.

[0004] ...

Examples

Embodiment 1

[0041] In this embodiment, the mass percentage of the chemical composition of the austenitic stainless steel plate is as follows:

[0042] C

mn

Si

S

P

Cr

Ni

Mo

N

O

0.029

1.8

0.41

0.001

0.03

17.8

11.9

2.01

0.035

0.003

[0043] The rest is Fe and other unavoidable impurities

[0044] In the molten steel smelting process, the dual deoxidation process of argon oxygen decarburization (AOD) and vacuum oxygen decarburization (VOD) is adopted in sequence. In the AOD process, Si is used for deoxidation, and in the VOD process, Si and Al are used for composite deoxidation. , and at the same time adjust the chemical composition of molten steel so that the content of ferrite δ is less than 3%.

[0045] In this embodiment, the Si content after the AOD process is controlled to be 0.15%, the amount of Al added in the VOD process is controlled to be 0.9 kg / ton of steel, and the tota...

Embodiment 2

[0050] In this embodiment, the mass percentage of the chemical composition of the austenitic stainless steel plate is as follows:

[0051] C

mn

Si

S

P

Cr

Ni

Mo

N

O

0.022

1.65

0.48

0.001

0.02

16.1

10.2

2.3

0.061

0.0038

[0052] The rest is Fe and other unavoidable impurities

[0053] In the molten steel smelting process, the dual deoxidation process of AOD and VOD is adopted in turn. In the AOD process, Si is used for deoxidation, and in the VOD process, Si and Al are used for composite deoxidation. At the same time, the chemical composition of molten steel is adjusted to make it ferrite. The content of δ is less than 3%.

[0054] In this embodiment, the Si content after the AOD process is controlled to be 0.25%, the amount of Al added in the VOD process is controlled to be 3.5 kg / ton of steel, and the total oxygen content is controlled to be 0.0038%.

[0055] In thi...

Embodiment 3

[0062] In this embodiment, the mass percentage of the chemical composition of the austenitic stainless steel plate is as follows:

[0063] C

mn

Si

S

P

Cr

Ni

Mo

N

O

0.012

1.00

0.8

0.003

0.02

18.8

12.6

1.5

0.07

0.004

[0064] The rest is Fe and other unavoidable impurities

[0065] In the molten steel smelting process, the dual deoxidation process of AOD and VOD is adopted in turn. In the AOD process, Si is used for deoxidation, and in the VOD process, Si and Al are used for composite deoxidation. At the same time, the chemical composition of molten steel is adjusted to make it ferrite. The content of δ is less than 3%.

[0066] In this embodiment, the Si content after the AOD process is controlled to be 0.17%, the amount of Al added in the VOD process is controlled to be 0.7 kg / ton of steel, and the total oxygen content is controlled to be 0.004%.

[0067] In this em...

technical field

[0001] The invention relates to the field of stainless steel production, in particular to an austenitic stainless steel plate with good surface quality and a manufacturing method thereof. Background technique

[0002] Cr-Ni austenitic stainless steel is widely used in the fields of petroleum, chemical industry, pressure vessel, aerospace and energy due to its good ductility, cold and hot workability and good corrosion resistance at high and low temperatures.

[0003] Compared with Cr-Ni austenitic stainless steel, Cr-Ni-Mo austenitic stainless steel has better resistance to dilute sulfuric acid, phosphoric acid, acetic acid, formic acid, urea and chloride pitting resistance, so its cold rolled As a product with high corrosion resistance and high value-added, the plate has a wider range of uses, and is widely used in the chemical industry and pressure vessel industry, such as heat exchangers, tank linings, electrolytic anode plates, and pipe making.

[0004] ...

Examples

Embodiment 1

[0041] In this embodiment, the mass percentage of the chemical composition of the austenitic stainless steel plate is as follows:

[0042] C

mn

Si

S

P

Cr

Ni

Mo

N

O

0.029

1.8

0.41

0.001

0.03

17.8

11.9

2.01

0.035

0.003

[0043] The rest is Fe and other unavoidable impurities

[0044] In the molten steel smelting process, the dual deoxidation process of argon oxygen decarburization (AOD) and vacuum oxygen decarburization (VOD) is adopted in sequence. In the AOD process, Si is used for deoxidation, and in the VOD process, Si and Al are used for composite deoxidation. , and at the same time adjust the chemical composition of molten steel so that the content of ferrite δ is less than 3%.

[0045] In this embodiment, the Si content after the AOD process is controlled to be 0.15%, the amount of Al added in the VOD process is controlled to be 0.9 kg / ton of steel, and the tota...

Embodiment 2

[0050] In this embodiment, the mass percentage of the chemical composition of the austenitic stainless steel plate is as follows:

[0051] C

mn

Si

S

P

Cr

Ni

Mo

N

O

0.022

1.65

0.48

0.001

0.02

16.1

10.2

2.3

0.061

0.0038

[0052] The rest is Fe and other unavoidable impurities

[0053] In the molten steel smelting process, the dual deoxidation process of AOD and VOD is adopted in turn. In the AOD process, Si is used for deoxidation, and in the VOD process, Si and Al are used for composite deoxidation. At the same time, the chemical composition of molten steel is adjusted to make it ferrite. The content of δ is less than 3%.

[0054] In this embodiment, the Si content after the AOD process is controlled to be 0.25%, the amount of Al added in the VOD process is controlled to be 3.5 kg / ton of steel, and the total oxygen content is controlled to be 0.0038%.

[0055] In thi...

Embodiment 3

[0062] In this embodiment, the mass percentage of the chemical composition of the austenitic stainless steel plate is as follows:

[0063] C

mn

Si

S

P

Cr

Ni

Mo

N

O

0.012

1.00

0.8

0.003

0.02

18.8

12.6

1.5

0.07

0.004

[0064] The rest is Fe and other unavoidable impurities

[0065] In the molten steel smelting process, the dual deoxidation process of AOD and VOD is adopted in turn. In the AOD process, Si is used for deoxidation, and in the VOD process, Si and Al are used for composite deoxidation. At the same time, the chemical composition of molten steel is adjusted to make it ferrite. The content of δ is less than 3%.

[0066] In this embodiment, the Si content after the AOD process is controlled to be 0.17%, the amount of Al added in the VOD process is controlled to be 0.7 kg / ton of steel, and the total oxygen content is controlled to be 0.004%.

[0067] In this em...

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