Nickel-saving austenitic stainless steel containing manganese, nitrogen and boron and fabrication method

Abstract

The invention belongs to the field of metal materials, particularly relates to a nickel-saving austenitic stainless steel containing manganese, nitrogen and boron and a fabrication method and solves the technical problems that traditional austenitic stainless steels are high in nickel content, scaling and sand hole are prone to occur during cold rolling, and the cost is high. By means of the technical scheme, the chemical components of the nickel-saving austenitic stainless steel containing the manganese, the nitrogen and the boron include C, Si, Mn, S, P, Ni, Cr, Cu, N, B, Ca and the balance Fe, according to weight percentage, C is larger than or equal to 0.070% and smaller than or equal to 0.15%, Si is smaller than or equal to 1.00%, Mn is larger than or equal to 8.0% and smaller than or equal to 10.0%, S is smaller than or equal to 0.030%, P is smaller than or equal to 0.060%, Ni is larger than or equal to 2.0% and smaller than or equal to 3.0%, Cr is larger than or equal to 16.5% and smaller than or equal to 18.5%, Cu is larger than or equal to 1.0% and smaller than or equal to 2.0%, N is larger than or equal to 0.1% and smaller than or equal to 0.25%, B is larger than or equal to (10*10-4)% and smaller than or equal to (30*10-4)%, and the Ca is larger than or equal to (30*10-4)% and smaller than or equal to (60*10-4)%. By means of the nickel-saving austenitic stainless steel containing the manganese, the nitrogen and the boron and the fabrication method, the problems that scaling, sand hole and the like are prone to occur during cold rolling are solved, the surface quality of the product is improved, manganese, nitrogen and carbon elements replace the nickel element, the production cost is lowered, and simultaneously the nickel-saving austenitic stainless steel has good corrosion resistance and a wide application prospect in terms of popularization in various stainless steel plants.

Description

technical field

[0001] The invention belongs to the field of metal materials. Specifically, it relates to a nickel-saving manganese-nitrogen-boron-containing austenitic stainless steel and a manufacturing method thereof. Background technique

[0002] With economic development and the increase in the consumption of nickel-consuming products such as stainless steel, my country's consumption of nickel resources is expanding significantly. However, limited by resources and development conditions, the output of nickel alloys in my country has grown slowly over the years, and most of them depend on imports. For this reason, the contradiction between the supply and demand of my country's nickel resources has gradually expanded, and the degree of dependence on foreign supplies has been continuously upgraded. Recently, the major exporting countries of nickel resources have added a large number of restrictive policies to the export of nickel resources and products, making my country'...

Examples

Embodiment 1

[0035] 45t of nickel-containing pig iron (its main chemical composition by mass percentage is: C 4.4%, S 0.15%, P 0.052%, Si 0.80%, Ni1.72%, the balance is Fe) and high-carbon ferrochrome 20.3t (its The main chemical composition by mass percentage is: Cr60.5%, C4.5%, Si0.03%, P0.04%, S0.06%, and the balance is Fe) as the base material, which is added to the 70t electric arc furnace to melt the stainless steel mother liquor, The smelting time in the electric furnace was 122 minutes, and the tapping temperature was 1605°C. After all melting, it is transferred to GOR converter for decarburization, using ferrosilicon for reduction, using manganese alloy and electrolytic copper alloying, the quality of manganese alloy added is 86.5kg / t steel, electrolytic copper is 12.5kg / t steel, and the smelting time is 99min . The molten steel obtained at a temperature of 1552° C. has the following chemical composition by mass percentage: C0.085%, Si0.38%, Ni2.04%, Mn8.55%, N0.14%, and the bala...

Embodiment 2

[0050] 44t of nickel-containing pig iron (the main chemical composition by mass percentage is: C 4.38%, S 0.14%, P 0.048%, Si 0.76%, Ni1.71%, the balance is Fe) and high-carbon ferrochromium 20.8.t ( Its main components are: Cr61.8%, C4.7%, Si0.04%, P0.04%, S0.05%, and the balance is Fe) as the base material, which is added to the 70t electric arc furnace for smelting stainless steel mother liquor. The smelting time is 114min, and the tapping temperature is 1608°C. After all melting, it is transferred to GOR converter for decarburization, using ferrosilicon for reduction, using manganese alloy and electrolytic copper alloying, the quality of manganese alloy added is 95.1kg / t steel, electrolytic copper is 12.7kg / t steel, and the smelting time is 102min . A molten steel with a temperature of 1545°C is obtained. Its chemical composition by mass percentage is: C 0.075%, Si 0.41%, Ni 2.80%, Mn 9.4%, N 0.19%, and the balance is Fe.

[0051] The molten steel is then sent to LF for...

Embodiment 3

[0064] 43.5t of nickel-containing pig iron (the main chemical composition by mass percentage is: C 4.40%, S 0.13%, P 0.042%, Si0.79%, Ni1.69%, the balance is Fe) and high-carbon ferrochrome 21.8t (The main components are: Cr59.1%, C4.3%, Si 0.04%, P0.04%, S0.05%, and the balance is Fe) as the base material, which is added to the 70t electric arc furnace for smelting stainless steel mother liquor, and the electric furnace The smelting time is 98min, and the tapping temperature is 1611℃. After all melting, transfer to GOR converter for decarburization, use ferrosilicon to reduce, use manganese alloy and electrolytic copper alloying, the quality of manganese alloy added is 97.5kg / t steel, electrolytic copper is 17kg / t steel, and the smelting time is 100min. A molten steel with a temperature of 1642°C is obtained. Its chemical composition by mass percentage is: C 0.090%, Si 0.37%, Ni 2.50%, Mn 9.6%, N 0.16%, and the balance is Fe.

[0065] The molten steel is then sent to LF for...

technical field

[0001] The invention belongs to the field of metal materials. Specifically, it relates to a nickel-saving manganese-nitrogen-boron-containing austenitic stainless steel and a manufacturing method thereof. Background technique

[0002] With economic development and the increase in the consumption of nickel-consuming products such as stainless steel, my country's consumption of nickel resources is expanding significantly. However, limited by resources and development conditions, the output of nickel alloys in my country has grown slowly over the years, and most of them depend on imports. For this reason, the contradiction between the supply and demand of my country's nickel resources has gradually expanded, and the degree of dependence on foreign supplies has been continuously upgraded. Recently, the major exporting countries of nickel resources have added a large number of restrictive policies to the export of nickel resources and products, making my country'...

Examples

Embodiment 1

[0035] 45t of nickel-containing pig iron (its main chemical composition by mass percentage is: C 4.4%, S 0.15%, P 0.052%, Si 0.80%, Ni1.72%, the balance is Fe) and high-carbon ferrochrome 20.3t (its The main chemical composition by mass percentage is: Cr60.5%, C4.5%, Si0.03%, P0.04%, S0.06%, and the balance is Fe) as the base material, which is added to the 70t electric arc furnace to melt the stainless steel mother liquor, The smelting time in the electric furnace was 122 minutes, and the tapping temperature was 1605°C. After all melting, it is transferred to GOR converter for decarburization, using ferrosilicon for reduction, using manganese alloy and electrolytic copper alloying, the quality of manganese alloy added is 86.5kg / t steel, electrolytic copper is 12.5kg / t steel, and the smelting time is 99min . The molten steel obtained at a temperature of 1552° C. has the following chemical composition by mass percentage: C0.085%, Si0.38%, Ni2.04%, Mn8.55%, N0.14%, and the bala...

Embodiment 2

[0050] 44t of nickel-containing pig iron (the main chemical composition by mass percentage is: C 4.38%, S 0.14%, P 0.048%, Si 0.76%, Ni1.71%, the balance is Fe) and high-carbon ferrochromium 20.8.t ( Its main components are: Cr61.8%, C4.7%, Si0.04%, P0.04%, S0.05%, and the balance is Fe) as the base material, which is added to the 70t electric arc furnace for smelting stainless steel mother liquor. The smelting time is 114min, and the tapping temperature is 1608°C. After all melting, it is transferred to GOR converter for decarburization, using ferrosilicon for reduction, using manganese alloy and electrolytic copper alloying, the quality of manganese alloy added is 95.1kg / t steel, electrolytic copper is 12.7kg / t steel, and the smelting time is 102min . A molten steel with a temperature of 1545°C is obtained. Its chemical composition by mass percentage is: C 0.075%, Si 0.41%, Ni 2.80%, Mn 9.4%, N 0.19%, and the balance is Fe.

[0051] The molten steel is then sent to LF for...

Embodiment 3

[0064] 43.5t of nickel-containing pig iron (the main chemical composition by mass percentage is: C 4.40%, S 0.13%, P 0.042%, Si0.79%, Ni1.69%, the balance is Fe) and high-carbon ferrochrome 21.8t (The main components are: Cr59.1%, C4.3%, Si 0.04%, P0.04%, S0.05%, and the balance is Fe) as the base material, which is added to the 70t electric arc furnace for smelting stainless steel mother liquor, and the electric furnace The smelting time is 98min, and the tapping temperature is 1611℃. After all melting, transfer to GOR converter for decarburization, use ferrosilicon to reduce, use manganese alloy and electrolytic copper alloying, the quality of manganese alloy added is 97.5kg / t steel, electrolytic copper is 17kg / t steel, and the smelting time is 100min. A molten steel with a temperature of 1642°C is obtained. Its chemical composition by mass percentage is: C 0.090%, Si 0.37%, Ni 2.50%, Mn 9.6%, N 0.16%, and the balance is Fe.

[0065] The molten steel is then sent to LF for...

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