Super double-phase stainless steel composite steel plate and manufacturing method thereof

A duplex stainless steel and clad steel plate technology, applied in the direction of manufacturing tools, chemical instruments and methods, furnaces, etc., can solve the problems of reduced material toughness and corrosion resistance, and achieve good mechanical properties and excellent corrosion resistance.

Active Publication Date: 2019-03-29
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the high content of chromium, molybdenum and nitrogen in pure 2507 duplex stainless steel, it is easy to form σ-equal intermetallic compounds near the range of 650-1000 °C, especially around the temperature of 900 °C. Due to the high content of chromium-molybdenum, the formation of σ phase is fast, As a result, the toughness and corrosion resistance of the material are reduced.

Method used

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  • Super double-phase stainless steel composite steel plate and manufacturing method thereof
  • Super double-phase stainless steel composite steel plate and manufacturing method thereof
  • Super double-phase stainless steel composite steel plate and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The chemical composition of base carbon steel is as follows (wt%): C: 0.045, Si: 0.20, Mn: 1.35, P: 0.015; S: 0.002, Al: 0.02, the composition of duplex stainless steel (wt%): C: 0.014, Si: 0.43, Mn: 1.27, Cr: 25.34, Ni: 7.32, Mo: 4.11, N: 0.30.

[0052] use as figure 1 The four-layer symmetrical separation method shown in the billet assembly: set up carbon steel billets, stainless steel billets, stainless steel billets and carbon steel billets in sequence from top to bottom, wherein the upper layer of carbon steel billets and their corresponding duplex stainless steel billets are vacuum-sealed, and the lower layer of carbon steel billets The corresponding duplex stainless steel billet is vacuum sealed to form two independent first vacuum systems; the second vacuum system consists of figure 1 Vacuum sealing is carried out between the first layer and the sixth layer (that is, the carbon steel billet and the carbon steel billet in this embodiment) shown. Together they f...

Embodiment 2

[0061] The base carbon steel adopts the grade carbon steel with a yield strength of 345MPa, and its chemical composition is (wt%): C: 0.12, Si: 0.24, Mn: 1.00, P: 0.015; S: 0.003, Nb: 0.01, Ti: 0.01, Al: 0.025, composition (wt%) of duplex stainless steel: C: 0.018, Si: 0.75, Mn: 1.25, Cr: 25.31, Ni: 7.19, Mo: 4.32, N: 0.30.

[0062] The way of assembling is the same as that of Example 1.

[0063] Composite rolling: Heating temperature is 1240°C, starting rolling temperature is 1200°C, finishing rolling temperature is 950°C; water spray cooling is used immediately after rolling, starting cooling temperature is 930°C, final cooling temperature is 670°C, rolling clad plate thickness is 3 +10mm, that is, the cladding stainless steel is 3mm thick, and the base carbon steel is 10mm thick.

[0064] The mechanical properties of the rolled clad plates are shown in Table 3.

[0065] Table 3. Mechanical properties of (3+10)mm thick composite plate

[0066]

[0067]

[0068] *A 7...

Embodiment 3

[0073] The base carbon steel adopts the yield strength of 460MPa grade carbon steel, and its chemical composition is (wt%): C: 0.09, Si: 0.22, Mn: 1.20, P: 0.013; S: 0.002, Nb: 0.025, Ti: 0.012, dual phase Composition (wt%) of stainless steel: C: 0.016, Si: 0.40, Mn: 1.19, Cr: 25.71, Ni: 6.96, Mo: 4.23, N: 0.29.

[0074] The blank adopts the same four-layer symmetrical blank assembly method as in Example 1.

[0075] Composite rolling: heating temperature is 1150°C, starting rolling temperature is 1120°C, finishing rolling temperature is 930°C; after rolling, it is produced by water spray cooling, after cooling to 550°C, it is naturally cooled in the air. The thickness of the rolled clad plate is 2+8mm.

[0076] The mechanical properties of the rolled clad plates are shown in Table 5.

[0077] Table 5 (2+8)mm thick composite plate mechanical properties

[0078]

[0079] **Tested with a 7.5mm×10mm×55mm sample (the thickness of the base carbon steel is 7.5mm).

[0080] The c...

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Abstract

The invention relates to a super double-phase stainless steel composite steel plate and manufacturing method thereof. The super double-phase stainless steel composite steel plate has a four-layer structure, wherein, the middle two layers are double-phase stainless steel, and the upper and lower layers are carbon steel; the double-phase stainless steel comprise the following components by weight percentage: less than or equal to 0.03% of C, less than or equal to 1.20% of Mn, less than or equal to 0.80% of Si, 24.0-26.0% of Cr, 6.0-8.0% of Ni, 3.0-5.0% of Mo, 0.24-0.32% of N, and the balance ofFe and inevitable impurities; the carbon steel comprises the following components by weight percentage: 0.03 to 0.12% of C, 0.10 to 0.45% of Si, 0.70 to 1.60% of Mn, less than 0.020% of P, less than 0.025% of S, 0-0.35% of Cu, 0-0.40% of Cr, 0-0.40% of Ni, 0-0.05% of Nb, 0-0.40% of Mo, 0-0.018% of Ti, 0.015-0.045% of Al, and balance of Fe and unavoidable impurities. The composite steel plate of the invention can obtain good structural strength and corrosion resistance. The composite steel plate is the rolled composite plate, which can realize metallurgical bonding of a coating layer and a basematerial, so that the good bonding force can be obtained.

Description

technical field [0001] The invention belongs to the technical field of production of corrosion-resistant composite steel plates, and in particular relates to a super duplex stainless steel composite steel plate and a manufacturing method thereof. The composite steel plate is suitable for use in environments with high chloride ion concentrations such as seawater with severe corrosion requirements. Background technique [0002] The loss caused by the corrosion of materials is huge, involving various fields. Especially with the development and progress of society, there are more and more varieties of chemical substances involved in the industrial or civilian fields, and their uses are becoming wider and wider, involving various fields such as metallurgy, chemical industry, construction, medical treatment, and food. These original storage, transportation, and application all require various anti-corrosion measures. [0003] Due to its pitting resistance constant higher than 40,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B15/01B32B15/18
CPCB32B15/011C21D2251/02C21D9/46C21D8/0226C21D8/0263C21D2261/00C21D6/004C21D6/005C21D1/25C21D1/02C21D1/19C22C38/04C22C38/02C22C38/06C22C38/12C22C38/44C22C38/001C22C38/004C21D6/008C21D8/0205C21D9/505C21D2211/001C21D2211/005C22C38/002C22C38/48C22C38/50
Inventor 梁晓军焦四海丁建华袁向前王治宇郝英敏
Owner BAOSHAN IRON & STEEL CO LTD
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