Preparation method for austenitic stainless steel used for 316LN nuclear power

A technology of austenitic stainless steel and nuclear power, which is applied in the field of preparation of 316LN austenitic stainless steel for nuclear power, can solve the problems that the performance cannot meet the production and application requirements, the intergranular corrosion resistance and mechanical properties are poor, and the balance control is difficult. Excellent resistance to marine and industrial atmospheric erosion, easy to operate, and simple process steps

Active Publication Date: 2015-01-21
ZHEJIANG YIDA SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current general-purpose 316LN austenitic stainless steel is a commonly used steel for nuclear power. 316LN austenitic stainless steel has poor intergranular corrosion resistance and mechanical properties. With the rapid development of the nuclear power i

Method used

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  • Preparation method for austenitic stainless steel used for 316LN nuclear power
  • Preparation method for austenitic stainless steel used for 316LN nuclear power

Examples

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Effect test

Embodiment 1

[0033] A preparation method for 316LN nuclear power austenitic stainless steel, comprising the following steps:

[0034] (1) Rough refining of EAF electric arc furnace

[0035] Select high-quality steel scrap with original ecological SP≤0.02% as raw material and add it to the EAF electric arc furnace for smelting. During the dephosphorization of ferronickel, control the Cr in the steel to ≤1.5%. Oxygen pressure 0.4~0.5Mpa, removal of P ≤ 0.012%, removal of C ≥ 0.5%; after slag flow during the oxidation period, control the temperature of the molten pool at 1630-1660°C, sample analysis, when P ≤ 0.012%, adjust the composition of molten steel, and raise the temperature to 1680 ℃ against steel, blowing N when mixing with steel 2 , 1100m 3 / h and add CaO, the amount of CaO added is 25Kg / ton of steel.

[0036] (2) AOD refining

[0037] (1) Phase I blowing: O 2 :N 2 = 4:1, the oxygen flow rate is controlled at 1900m 3 / h, the temperature is controlled at 1650-1670°C, and the c...

Embodiment 2

[0052] A preparation method for 316LN nuclear power austenitic stainless steel, comprising the following steps:

[0053] (1) Rough refining of EAF electric arc furnace

[0054] Select GCr15 high-quality scrap steel as raw material and add it to EAF electric arc furnace for smelting. During the dephosphorization of ferronickel, control the Cr in the steel to be ≤ 1.5%. , removal of P≤0.012%, removal of C≥0.5%; after slag flow in the oxidation period, control the temperature of the molten pool at 1630-1660°C, and take samples for analysis. Blow N 2 , 1140m 3 / h and add CaO, the amount of CaO added is 28Kg / ton of steel.

[0055] (2) AOD refining

[0056] (1) Phase I blowing: O 2 :N 2 =4.5:1, the oxygen flow rate is controlled at 1970m 3 / h, the temperature is controlled at 1650-1670°C, and the control components are Cr: 6.80-17.00%, Ni: 10.15-10.30%, Mo: 2.08-2.15%, and C: 0.20-0.30%.

[0057] (2) Phase II blowing: O 2 :N 2 =1:1.6, the oxygen flow rate is controlled at ...

Embodiment 3

[0069] A preparation method for 316LN nuclear power austenitic stainless steel, comprising the following steps:

[0070] (1) Rough refining of EAF electric arc furnace

[0071] Select high-quality steel scrap with original ecological SP≤0.02% as raw material and add it to the EAF electric arc furnace for smelting. During the dephosphorization of ferronickel, control the Cr in the steel to ≤1.5%. Oxygen pressure 0.4~0.5Mpa, removal of P ≤ 0.012%, removal of C ≥ 0.5%; after slag flow during the oxidation period, control the temperature of the molten pool at 1630-1660°C, sample analysis, when P ≤ 0.012%, adjust the composition of molten steel, and raise the temperature to 1700 ℃ against steel, blowing N when mixing with steel 2 , 1150m 3 / h and add CaO, the amount of CaO added is 30Kg / ton of steel.

[0072] (2) AOD refining

[0073] (1) Phase I blowing: O 2 :N 2 =5:1, the oxygen flow rate is controlled at 1950m 3 / h, the temperature is controlled at 1650-1670°C, and the co...

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Abstract

The invention discloses a preparation method for austenitic stainless steel used for 316LN nuclear power, and solves the problem that conventional 316LN austenitic stainless steel cannot meet actual requirements of nuclear power industry. The preparation method comprises the steps as follows: firstly, EAF electric-arc furnace coarse refining; secondly, AOD refining; thirdly, pouring; fourthly, hot-work forging; fifthly, thermal treating. The preparation method provided by the invention is simple in technology steps, easy to operate, and is suitable for industrial production; through strictly controlling the chemical components of the stainless steel and through the optimal design of the smelting, the forging and thermal treating technology, the balance of carbon and nitrogen is controlled effectively, and the austenitic stainless steel used for 316LN nuclear power is enabled to have excellent intercrystalline corrosion resistance and mechanical property; besides, the austenitic stainless steel used for 316LN nuclear power is further provided with excellent ocean and industrial air corrosion resistance, and is particularly suitable for high-pressure bowler pipes and locomotive components in nuclear power industries.

Description

technical field [0001] The invention relates to the technical field of metal smelting, in particular to a preparation method of 316LN austenitic stainless steel for nuclear power. Background technique [0002] Due to its good corrosion resistance and mechanical properties, austenitic stainless steel has been widely used in the preparation of high-temperature environment components of nuclear fission reactors, such as reactor internals, boron injection tanks, spent nuclear fuel storage and transportation devices, and nuclear fuel pools. [0003] The current general-purpose 316LN austenitic stainless steel is a commonly used steel for nuclear power. 316LN austenitic stainless steel has poor intergranular corrosion resistance and mechanical properties. With the rapid development of the nuclear power industry, its performance can no longer meet the actual production and application requirements. Therefore, it is urgent to further improve the comprehensive performance of 316LN au...

Claims

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Application Information

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IPC IPC(8): C22C38/52C22C33/04C21D1/18C21D8/00C21C7/00
CPCC21C7/068C21D1/18C21D8/005C22C38/001C22C38/42C22C38/44C22C38/52C22C38/58Y02P10/20
Inventor 吴增安吴宇吴亮戴丹江
Owner ZHEJIANG YIDA SPECIAL STEEL
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