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Thermal processing method to control the precipitation of σ phase in nodular ni-type duplex stainless steel at lower processing temperature

A duplex stainless steel, processing temperature technology, applied in the field of thermal processing of duplex stainless steel, can solve problems such as micro-cracks, lower mechanical properties and corrosion resistance of products, and unclear influence

Active Publication Date: 2021-08-20
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Meanwhile, it has been reported that higher Mn additions can promote the precipitation of σ phase, leading to deformation cracking and microcracks during hot working
In addition, the hard and brittle σ phase will greatly reduce the mechanical properties and corrosion resistance of the product
At present, the effect of rolling parameters (deformation temperature, deformation rate, etc.) on the precipitation of σ phase in the low temperature rolling process of high Mn duplex stainless steel plate is not yet clear.

Method used

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  • Thermal processing method to control the precipitation of σ phase in nodular ni-type duplex stainless steel at lower processing temperature
  • Thermal processing method to control the precipitation of σ phase in nodular ni-type duplex stainless steel at lower processing temperature
  • Thermal processing method to control the precipitation of σ phase in nodular ni-type duplex stainless steel at lower processing temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The chemical composition of the duplex stainless steel described in this example is (wt%): C: 0.036, Si: 0.25, S: 0.0028, P: 0.0058, Mn: 14.13, Cr: 23.69, Ni: 2.2, Mo: 1.29, Cu : 0.14, N: 0.28, the rest is Fe;

[0032] (1) The ingot is obtained by refining in a vacuum melting furnace, and then subjected to heat preservation at 1200°C for 2 hours to homogenize the structure;

[0033] (2) Forging the ingot, the initial forging temperature is 1100 °C, the final forging temperature is 950 °C, the forging ratio is 4, forged into a slab with a width of 130 mm and a thickness of 30 mm, and then rapidly cooled;

[0034] (3) Heat the obtained slab to 1100 °C for 1 h, then water quench to room temperature;

[0035] (4) The slab is hot-rolled, the starting rolling temperature is controlled at 1100 ℃, the final rolling temperature is kept at 980 ℃, rolled into a 12mm thick plate, and then rapidly water-cooled;

[0036] (5) Cut the rolled sheet into 20×20 mm sheets along the rolli...

Embodiment 2

[0041] The chemical composition of the duplex stainless steel described in this example is (wt%): C: 0.036, Si: 0.25, S: 0.0028, P: 0.0058, Mn: 14.13, Cr: 23.69, Ni: 2.2, Mo: 1.29, Cu : 0.14, N: 0.28, the rest is Fe.

[0042] (1) The cast ingot was obtained by refining in a vacuum melting furnace, and was homogenized at 1210 °C for 2 h;

[0043] (2) Forging the ingot, the initial forging temperature is 1150 °C, the final forging temperature is 980 °C, the forging ratio is 4.5, forged into a slab with a width of 130 mm and a thickness of 30 mm, and then rapidly cooled;

[0044] (3) Heat the obtained slab to 1120 °C, perform solution treatment for 1 h, and then water quench to room temperature;

[0045] (4) The slab is hot-rolled, the starting rolling temperature is controlled at 1120 °C, the final rolling temperature is maintained at 980 °C, rolled into a 12mm thick plate, and then rapidly water-cooled;

[0046] (5) Cut the rolled plate into 20 × 20 mm plates along the rolling ...

Embodiment 3

[0051] The chemical composition of the duplex stainless steel described in this example is (wt%): C: 0.036, Si: 0.25, S: 0.0028, P: 0.0058, Mn: 14.13, Cr: 23.69, Ni: 2.2, Mo: 1.29, Cu : 0.14, N: 0.28, and the rest is Fe.

[0052] (1) The ingot is obtained by refining in a vacuum melting furnace, and then subjected to a homogenization treatment at 1200 ℃ for 2 hours;

[0053] (2) Forging the ingot, the initial forging temperature is 1130 °C, the final forging temperature is 990 °C, the forging ratio is 5, forged into a slab with a width of 130 mm and a thickness of 30 mm, and then rapidly cooled;

[0054] (3) Heat the obtained slab to 1110 °C, perform solution treatment for 1 hour, and then water quench to room temperature;

[0055] (4) The slab is hot-rolled, the starting rolling temperature is controlled at 1080 °C, the final rolling temperature is maintained at 980 °C, rolled into a 12mm thick plate, and then rapidly water-cooled;

[0056] (5) Cut the rolled sheet into 20×...

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Abstract

The invention discloses a thermal processing method for controlling the precipitation of Ni-type duplex stainless steel at a lower processing temperature σ phase. The amount of σ precipitated phase in the rolling process, the present invention adopts solid solution treatment and high temperature compression test, found the law of the influence of rolling temperature and deformation rate on the behavior of σ phase precipitation in Ni-saving duplex stainless steel plate, and determined the effective avoidance of σ phase The process parameters of phase precipitation and the relationship between the amount of σ phase precipitation and deformation parameters provide guidance for the optimization of the rolling process at lower temperatures. At the same time, this method can be used for the 23%Cr high Mn series Ni-type duplex stainless steel In the field of industrial production such as hot rolling and post-processing of parts, it can solve the problems of deformation and cracking caused by the formation of precipitated phases in the process of hot processing.

Description

technical field [0001] The invention relates to a thermal processing method for controlling the σ phase precipitation of Ni-sparing duplex stainless steel at a lower processing temperature, and belongs to the technical field of thermal processing of duplex stainless steel. Background technique [0002] Duplex stainless steel has the characteristics of ferrite and austenite two-phase structure, so it has the excellent toughness and weldability of austenitic stainless steel, as well as the high strength and good chloride corrosion resistance of ferritic stainless steel, and is widely used In petroleum, chemical, energy and other industrial fields. As we all know, Ni element is one of the main alloying elements in stainless steel. In recent years, due to the shortage of Ni resources in the world and the price of Ni rising year by year, the production cost of stainless steel has increased significantly. However, the price of Mn is 7-8 times cheaper than Ni. Therefore, in rece...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D7/13C21D6/00C21D8/02
CPCC21D6/004C21D6/005C21D6/008C21D7/13C21D8/0205C21D8/0221C21D8/0226C21D8/0247
Inventor 杨银辉蒲超博邓亚辉
Owner KUNMING UNIV OF SCI & TECH
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