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Electroslag remelting slag system of a super duplex stainless steel

A duplex stainless steel and electroslag remelting technology, which is applied in the field of electroslag remelting slag system, can solve the problems of deteriorated material thermoplasticity, mechanical properties and corrosion resistance, adverse effects of thermal processing performance, and low thermal processing yield, etc. To achieve the effect of broadening and further promotion and application, less impurity elements, and improving the purity of the alloy

Active Publication Date: 2020-02-14
CHONGQING MATERIALS RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the higher and higher alloy content of super duplex steel, some physical metallurgical problems are inevitably encountered in the process of its development. For example, when the Cr content is as high as 25%, it is very easy to Precipitation of σ phase, which seriously deteriorates the thermoplasticity, mechanical properties and corrosion resistance of the material, especially the tendency of impurity elements in steel to adversely affect its hot workability is more prominent
Poor thermoplasticity and low thermal processing yield have become a big obstacle to the industrial promotion and application of this series of duplex stainless steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The electroslag heavy melting slag system of super duplex stainless steel has a counterweight of 7kg, and the distribution ratio of each component is, CaF 2 : 4.9kg (70%), CaO: 0.91kg (13%), Al 2 o 3 : 0.7kg (10%), MgO: 0.35kg (5%), SiO 2 : 0.14kg (2%).

[0030] The counterweight of super duplex stainless steel is 30kg, and it is cast into Φ130mm by vacuum induction melting. The weight percentage of each component is: C: 0.012%, Cr: 27.5%, Ni: 7%, Mo: 4.5%, Si: 0.2% , Mn: 0.2%, N: 0.5%, Fe: the remaining self-consumable electrode rod. After the surface of the consumable electrode rod is sanded and finished, it is reserved for electroslag remelting.

[0031] After the above slag material is prepared, it is baked at 800℃×8h, then heated in the slag melting furnace to a molten state and poured into a Φ160mm crystallizer, and the above electrode rod is slowly inserted into the slag material in a molten state. Adjust the voltage to stabilize to 45V, and the current to 3...

Embodiment 2

[0036] The electroslag remelting slag system of super duplex stainless steel has a counterweight of 45kg, and the distribution ratio of each component is, CaF 2 : 29.25kg (65%), CaO: 6.75kg (15%), Al 2 o 3 : 4.5kg (10%), MgO: 3.6kg (8%), SiO 2 : 0.9kg (2%).

[0037] The counterweight of super duplex stainless steel is 500kg, which is cast into Φ200mm by vacuum induction melting, and the composition percentage is: C: 0.010%, Cr: 30.5%, Ni: 7%, Mo: 4.5%, Si: 0.2%, Mn: 0.2%, N: 0.6%, Fe: the remaining self-consumable electrode rod. After the surface of the consumable electrode rod is sanded and finished, it is reserved for electroslag remelting.

[0038] After the above slag is prepared, it is baked at 800℃×12h, and then the slag is melted and arced in a Φ400mm crystallizer until the slag is completely melted into a molten state. The above electrode rod is slowly inserted into the molten slag, and the power is turned on. Adjust the voltage after the arc to stabilize to 53V a...

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Abstract

The invention relates to an electroslag remelting slag system of super duplex stainless steel. The electroslag remelting slag system comprises the following ingredients by weight percentage: 55-74% ofCaF2, 5-20% of CaO, 5-20% of Al2O3, 5-15% of MgO and 1-15% of SiO2. According to the electroslag remelting slag system, optimal slag alkalinity is achieved by adjusting contents of basic oxides, namely CaO and MgO, and acidic oxides, namely SiO2 and Al2O3; and the electroslag remelting slag system is particularly applicable to electroslag remelting of the super duplex stainless steel, improves purity of the super duplex stainless steel, reduces a content of harmful impurity elements, optimizes an ingot structure, greatly improves processability of the stainless steel increases a hot processing yield and contributes to achieving excellent mechanical properties and corrosion resistance.

Description

technical field [0001] The invention belongs to the field of metallurgical preparation of metal materials, in particular to an electroslag remelting slag system of super duplex stainless steel. Background technique [0002] Duplex stainless steel is a kind of stainless steel that contains both austenite (γ) and ferrite (α) structure, and the two phases exist independently and have a large content. This stainless steel has both ferritic stainless steel and austenitic stainless steel. excellent performance. Super duplex stainless steel is the third generation of duplex stainless steel developed in recent years. On the premise of ensuring the thermal stability of the steel structure, the content of chromium, molybdenum and nitrogen in the steel is further increased to obtain higher strength and better corrosion resistance. Performance, the remarkable feature of this type of steel is that PRE (Cr%+3.3×(Mo+1 / 2W)+16×N% in steel) ≥ 40, and the PRE value of some super duplex stainl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B9/18C22C33/04
CPCC22B9/18C22C33/04
Inventor 刘海定陈登华何曲波王东哲刘应龙王春光
Owner CHONGQING MATERIALS RES INST
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