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Method for smelting low-silicon low-aluminum high-boron martensitic stainless steel

A technology of martensitic stainless steel and smelting method, which is applied in the field of iron and steel smelting, can solve problems such as the difficulty in controlling the content of Si, Al and B in martensitic stainless steel, achieve good mechanical properties and durable performance, low production cost, and high purity Effect

Active Publication Date: 2016-02-03
PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing "electric arc furnace + VOD" process is difficult to control the content of Si, Al and B in martensitic stainless steel, and to provide a kind of low-silicon, low-aluminum and high-boron stainless steel that can meet the requirements of the corresponding model. Smelting method of martensitic stainless steel

Method used

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  • Method for smelting low-silicon low-aluminum high-boron martensitic stainless steel
  • Method for smelting low-silicon low-aluminum high-boron martensitic stainless steel

Examples

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Effect test

Embodiment 1

[0054] This embodiment is used to illustrate the smelting method of Co3W3 steel.

[0055] (1) The ingredients are returned from Benxi Steel, raw steel (including Ni, W, Mo, Co, P≤0.006), high-carbon ferrochrome (required P≤0.015%), N-Cr alloy, Fe-B alloy, Fe- Composed of Nb alloy and Fe-V alloy, the ratio of the ingredients makes the content of each element except P, Cr and Al basically meet the requirements of Co3W3. In the control charge: the content of P is about 0.008% by weight, and the content of Cr is about 0.008% by weight. 10.50% by weight, Al is not specially compounded; the weight of the charge is about 42 tons.

[0056] (2) In the electric arc furnace: a) melt the furnace material, and take samples for full analysis; b) control the temperature of molten steel at about 1550°C, blow oxygen to decarburize and adjust the composition (mainly adjust Cr to 10.5% by weight, W to 2.7 % by weight and Co to 3.1% by weight), the content of carbon at the end point is 0.45% by ...

Embodiment 2

[0063] This embodiment is used to illustrate the smelting method of Co3W2 steel.

[0064] (1) The ingredients are returned from Benxi Steel, raw steel (including Ni, W, Mo, Co, P≤0.006), high-carbon ferrochrome (required P≤0.015%), N-Cr alloy, Fe-B alloy, Fe- Composed of Nb alloy and Fe-V alloy, the ratio of the ingredients makes the content of each element except P, Cr and Al basically meet the requirements of Co3W2. In the control charge: the content of P is about 0.007% by weight, and the content of Cr is about 0.007% by weight. 10.30% by weight, Al is not specially compounded; the weight of the charge is about 42.5 tons.

[0065](2) In the electric arc furnace: a) melt the charge, and take samples for full analysis; b) control the temperature of molten steel at about 1530°C, blow oxygen to decarburize and adjust the composition (mainly adjust Cr to 10.3% by weight, W to 1.7 % by weight and Co to 3.0% by weight), the content of carbon at the end point is 0.40% by weight of...

Embodiment 3

[0072] This example is used to illustrate the smelting method of Co3W steel.

[0073] (1) The ingredients are returned from Benxi Steel, raw steel (including Ni, W, Mo, Co, P≤0.006), high-carbon ferrochrome (required P≤0.015%), N-Cr alloy, Fe-B alloy, Fe- Composed of Nb alloy and Fe-V alloy, the ratio of the ingredients makes the content of each element except P, Cr and Al basically meet the requirements of Co3W2. In the control charge: the content of P is about 0.009% by weight, and the content of Cr is about 0.009% by weight. 10.20% by weight, Al is not specially compounded; the weight of the charge is about 41.5 tons.

[0074] (2) In the electric arc furnace: a) melt the furnace material, and take samples for full analysis; b) control the temperature of molten steel at about 1580°C, blow oxygen to decarburize and adjust the composition (mainly adjust Cr to 10.20 wt%, W to 1.80 % by weight and Co to 3.20% by weight), the content of carbon at the end point is 0.50% by weight...

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Abstract

The invention relates to the field of steel smelting, in particular to a method for smelting low-silicon low-aluminum high-boron martensitic stainless steel. By total weight, the martensitic stainless steel comprises not larger than 0.1 % of Si, not larger than 0.015 % of Al and 0.015%-0.05 % of B. The method includes the steps that firstly, furnace charge is prepared; secondly, electric arc furnace rough smelting is conducted, wherein melting down, oxygen blowing and decarbonizaiton, pre-reduction, reduction and component adjustment are conducted; thirdly, LF furnace refinement is conducted, wherein reduction is conducted through a reducing agent and then components are adjusted; fourthly, VOD furnace refinement is conducted, wherein vacuum oxygen blowing and decarbonization, reduction and component adjustment are conducted sequentially; fifthly, LF furnace deep refinement is conducted, wherein reduction is conducted through the reducing agent, and then ferroboron is added; and sixthly, pouring is conducted. By means of the smelting method, the problem that the content of the Si, the content of the Al and the content of the B in the martensitic stainless steel are difficult to control by means of an existing electric arc furnace plus VOD process is solved, and the low-silicon low-aluminum high-boron martensitic stainless steel meeting the requirements of corresponding models is smelted.

Description

technical field [0001] The invention relates to the field of iron and steel smelting, in particular to a method for smelting martensitic stainless steel with low silicon, low aluminum and high boron. Background technique [0002] Martensitic stainless steel represented by steel types such as 10Cr11Co3W3NiMoVNbNB (Co3W3), 12Cr10Co3W2NiMoVNbNB (Co3W2) and 1Cr10Co3MoWVNbNB (Co3W) is a material for 620°C ultra-supercritical steam turbines. The main characteristics of the chemical elements of this type of material are that the content of Si and Al is very low (Co3W3, Co3W2, Co3W require Si≤0.10% by weight, Al≤0.015% by weight), and the range of B content is narrow (Co3W3 requires B0.01-0.04% by weight , Co3W2 requires B0.0025-0.0065% by weight, Co3W requires B0.003-0.008% by weight). Due to the special purpose of this type of material, the technical documents require that the electrode rod obtained by smelting must be electroslag remelted to improve the uniformity and purity of ...

Claims

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Application Information

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IPC IPC(8): C22C38/32C22C33/04
Inventor 余志川朱小阳胡进罗通伟
Owner PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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