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Medium plate made of duplex stainless steel with excellent low-temperature toughness and manufacturing method for medium plate

A technology of duplex stainless steel and low-temperature toughness, which is applied in the field of duplex stainless steel and its manufacturing, can solve the problems of toughness (impact value drop, etc.), achieve the effect of increasing N solubility, reducing adverse effects, and improving corrosion resistance

Inactive Publication Date: 2012-08-29
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the Ni content in the alloy is below 1.7%, its toughness (impact value) will decrease significantly as the temperature decreases

Method used

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  • Medium plate made of duplex stainless steel with excellent low-temperature toughness and manufacturing method for medium plate
  • Medium plate made of duplex stainless steel with excellent low-temperature toughness and manufacturing method for medium plate
  • Medium plate made of duplex stainless steel with excellent low-temperature toughness and manufacturing method for medium plate

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Embodiment 1

[0045] The metallographic diagram of the alloy of embodiment 1 along the rolling direction (also known as the longitudinal direction) is as follows figure 1 As shown (the austenite phase accounts for about 58%), the alloy metallographic diagram of the alloy in Example 1 perpendicular to the rolling direction (also known as the transverse direction) is as follows figure 2 As shown, the metallographic diagram of the alloy of Comparative Example 2 along the rolling direction is as follows image 3 shown. Table 1 also shows the mechanical properties and corrosion resistance of the steel of the present invention and the comparative steel types, especially the impact toughness at -40°C and -80°C. Among them, the metallographic sample of duplex stainless steel is electrolytically corroded, and the etchant is 40gKOH+100mlH 2 O, corrosion current 0.3~0.8A / cm 2 The mechanical properties are all taken from the hot-rolled annealed sheet, and the impact properties are in accordance wit...

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Abstract

The invention discloses a medium plate made of duplex stainless steel with excellent low-temperature toughness and a manufacturing method for the medium plate. The duplex stainless steel comprises the following chemical components in weight percentage: 0.01-0.10 percent of C, 0.2-1.0 percent of Si, 2.0-3.5 percent of Mn, 20.0-21.5 percent of Cr, 3.0-3.5 percent of Ni, 0.08-0.15 percent of N, 0.5-1.0 percent of W, 0.01-0.5 percent of Cu, 0.001-0.005 percent of B, 0.05-0.25 percent of V and the balance Fe and unavoidable impurities. The stainless steel is proper in phase proportion and excellent in low-temperature toughness through controlling component proportion. Meanwhile, the length-width ratio of the austenite phase of the stainless steel along the rolling direction is enabled to be less than 3 through a special rolling process, and thus, the stainless steel is prevented from being excessively lengthened along the rolling direction. The duplex stainless steel is excellent in low-temperature toughness along the longitudinal direction and the lateral direction. The longitudinal impact value and the lateral impact value are greater than 220J at the temperature of -40 DEG C, and the longitudinal impact value and the lateral impact value are greater than 200J at the temperature of -80 DEG C. The duplex stainless steel can be widely applied to the field of coasting buildings and petrochemical engineering under the cold condition.

Description

technical field [0001] The invention relates to a duplex stainless steel and a manufacturing method thereof, in particular to a duplex stainless steel with excellent low-temperature toughness and a manufacturing method thereof. Background technique [0002] Duplex stainless steel is composed of ferrite and austenite, and the proportion of each phase is not less than 30%. Due to the characteristics of the two-phase structure, duplex stainless steel has the advantages of both ferritic stainless steel and austenitic stainless steel. Compared with ferritic stainless steel, it has high toughness, low brittle transition temperature, intergranular corrosion resistance and good welding performance. At the same time, the advantages of high thermal conductivity and small expansion coefficient of ferritic steel are retained. Compared with austenitic stainless steel, its yield strength is significantly improved, and its resistance to chloride stress corrosion cracking is significantly ...

Claims

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Application Information

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IPC IPC(8): C22C38/58C21D8/02
Inventor 江来珠张伟宋红梅王治宇胡锦程
Owner BAOSHAN IRON & STEEL CO LTD
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