Intergranular corrosion resistant Ni-saving type duplex stainless steel and preparation method thereof

A technology of duplex stainless steel and intergranular corrosion, applied in the field of steel alloy materials, can solve the problems of no intergranular corrosion sensitivity data, no mention of the intergranular corrosion resistance of stainless steel, and high cost

Pending Publication Date: 2021-09-07
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

At present, a large number of researches on the intergranular corrosion performance of stainless steel focus on aging treatment, tempering and other heat treatment processes, and there are few relevant reports on the influence of thermal deformation process on intergranular corrosion performance.
[0004] Publication No. CN107012407A discloses a corrosion-resistant duplex stainless steel and its preparation method. The duplex stainless steel disclosed in this patent reduces the content of precious element Ni in duplex stainless steel, increases the content of Cr and other elements, increases the content of B, Te and Nb elements make the invented stainless steel products still have excellent resistance to stress corrosion cracking and pitting corrosion under the influence of aging heat treatment, greatly improve the corrosion resistance and reduce the cost of raw materials, but the intergranular resistance of stainless steel Corrosion ability is not mentioned
[0005] Publication number CN109295387B discloses a duplex stainless steel plate with good corrosion resistance and its manufacturing method. The duplex stainless steel disclosed in this patent adds a relatively high content of Cu element on the basis of traditional duplex stainless steel to improve its mechanical properties and seawater resistance. Corrosion performance, although it improves the corrosion resistance and involves intergranular corrosion resistance, but there is no specific intergranular corrosion sensitivity data, and the Ni content is relatively high at 4% to 9%, and the cost is relatively high

Method used

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  • Intergranular corrosion resistant Ni-saving type duplex stainless steel and preparation method thereof
  • Intergranular corrosion resistant Ni-saving type duplex stainless steel and preparation method thereof
  • Intergranular corrosion resistant Ni-saving type duplex stainless steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In this embodiment, there are three types of Ni-saving duplex stainless steel components and mass percentages:

[0036] 1#C: 0.04%, Si: 0.22%, Mn: 6.3%, Cr: 23.34%, Ni: 2.20%, Mo: 1.41%, Cu: 0.14%, N: 0.26%, P: 0.008%, S: 0.004 %, the balance is Fe and unavoidable impurities;

[0037] 2#C: 0.04%, Si: 0.23%, Mn: 10.3%, Cr: 23.39%, Ni: 2.20%, Mo: 1.35%, Cu: 0.14%, N: 0.28%, P: 0.006%, S: 0.004 %, the balance is Fe and unavoidable impurities;

[0038] 3#C: 0.04%, Si: 0.25%, Mn: 14.3%, Cr: 23.40%, Ni: 2.20%, Mo: 1.30%, Cu: 0.14%, N: 0.28%, P: 0.006%, S: 0.003 %, the balance is Fe and unavoidable impurities;

[0039]The above three kinds of Ni-saving duplex stainless steel 1#, 2# and 3# are prepared according to the following steps:

[0040] (1) adopt 50kg vacuum melting furnace to refine different manganese content 23% Cr section Ni type duplex stainless steel billet;

[0041] (2) Perform pre-forging treatment on the cast slab, control the initial forging temperature a...

Embodiment 2

[0048] In this example, the composition and mass percentage of Ni-saving duplex stainless steel are: C: 0.04%, Si: 0.22%, Mn: 6.3%, Cr: 23.34%, Ni: 2.20%, Mo: 1.41%, Cu: 0.14 %, N: 0.26%, P: 0.008%, S: 0.004%, the balance is Fe and unavoidable impurities;

[0049] The above-mentioned Ni-saving type duplex stainless steel is prepared according to the following steps:

[0050] (1) Adopt 50kg vacuum melting furnace to refine 6.3% Mn content 23% Cr section Ni type duplex stainless steel billet;

[0051] (2) Perform pre-forging treatment on the cast slab, control the initial forging temperature at 1050°C to 1150°C, control the final forging temperature at 1000°C to 1050°C, forging ratio of 2 to 4, and quickly cool after forging;

[0052] (3) Pre-rolling the plate obtained by forging, the starting rolling temperature is controlled at 1100°C to 1200°C, the final rolling temperature is controlled at 1000°C to 1050°C, and the plate is obtained by water quenching;

[0053] (4) The pla...

Embodiment 3

[0059] In this embodiment, the composition and mass percentage of Ni-saving duplex stainless steel are: C: 0.04%, Si: 0.23%, Mn: 10.3%, Cr: 23.39%, Ni: 2.20%, Mo: 1.35%, Cu: 0.14 %, N: 0.28%, P: 0.006%, S: 0.004%, the balance is Fe and unavoidable impurities;

[0060] (1) Adopt 50kg vacuum melting furnace to refine 10.3% Mn content 23% Cr section Ni type duplex stainless steel billet;

[0061] (2) Perform pre-forging treatment on the cast slab, control the initial forging temperature at 1050°C to 1150°C, control the final forging temperature at 1000°C to 1050°C, forging ratio of 2 to 4, and quickly cool after forging;

[0062] (3) Pre-rolling the plate obtained by forging, the starting rolling temperature is controlled at 1100°C to 1200°C, the final rolling temperature is controlled at 1000°C to 1050°C, and the plate is obtained by water quenching;

[0063] (4) The plate obtained after rolling and water cooling is processed into φ8mm×15mm, and solution treatment is carried ou...

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Abstract

The invention provides intergranular corrosion resistant Ni-saving type duplex stainless steel. The intergranular corrosion resistant Ni-saving type duplex stainless steel is prepared from the following chemical components in percentage by mass: 0.034 to 0.04 percent of C, 0.20 to 0.26 percent of Si, 5.9 to 14.6 percent of Mn, 22.30 to 23.69 percent of Cr, 2.12 to 2.40 percent of Ni, 1.20 to 1.41 percent of Mo, 0.10 to 0.14 percent of Cu, 0.26 to 0.28 percent of N, less than or equal to 0.008 percent of P, less than or equal to 0.006 percent of S and the balance of Fe and inevitable impurities. The invention further provides a preparation method of the intergranular corrosion resistant Ni-saving type duplex stainless steel, experimental steel is obtained through vacuum smelting and hot compression experiments, and the intergranular corrosion sensitivity of 23% Cr Ni-saving type duplex stainless steel solid solution state and hot compression samples with different Mn contents is tested through a double-ring potentiodynamic reactivation (DL-EPR). The relationship between the manganese content and the strain rate and the deformation temperature is regulated and controlled, the change trend of the corresponding intergranular corrosion sensitivity is analyzed, the influence rule of the deformation temperature, the strain rate and the Mn content change on the intergranular corrosion sensitivity is analyzed, and then the duplex stainless steel with good intergranular corrosion resistance under the condition of different Mn contents is obtained.

Description

technical field [0001] The invention relates to a Ni-saving duplex stainless steel and a preparation method thereof, in particular to a Ni-saving duplex stainless steel resistant to intergranular corrosion and a preparation method thereof, belonging to the technical field of iron and steel alloy materials. Background technique [0002] Duplex stainless steel (DSS for short) takes into account the two-phase structure characteristics of ferrite (δ) and austenite (γ), and the proportion of one phase is about 45% to 55%, and the content is less in special cases The phase accounted for at least 30%. Duplex stainless steel has the dual advantages of low cost and high performance. It is a structural engineering material with high strength and good corrosion resistance. It is widely used in petrochemical, equipment manufacturing, seawater desalination and nuclear power engineering. Hotspots in the research field of corrosion alloys. [0003] Ni-saving duplex stainless steel has th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/42C22C38/44C22C38/58C23F1/28C21D1/00C21D1/18C21D6/00C21D8/02C21D9/00
CPCC22C38/02C22C38/58C22C38/44C22C38/42C22C38/001C21D1/18C21D1/00C21D6/004C21D6/005C21D6/008C21D8/0221C21D9/0081C23F1/28C21D2211/005C21D2211/001
Inventor 杨银辉王刘行蒲超博刘泽辉
Owner KUNMING UNIV OF SCI & TECH
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