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Stainless steel composite plate for weathering-resistant steel bridge with low yield ratio

A low yield ratio, stainless steel technology, applied in chemical instruments and methods, layered products, metal layered products, etc., can solve the problems of polluted environment, poor atmospheric corrosion resistance, etc., achieve high metallurgical bonding quality, improve resistance Corrosion performance, effect of excellent corrosion resistance

Active Publication Date: 2022-01-21
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If non-weather-resistant bridges and stainless steel composite panels are used to manufacture the bridge deck structure, the surface of the base material cannot form an effective rust layer that is resistant to atmospheric corrosion, and it needs to be painted for protection, which also has the problem of polluting the environment. Difference

Method used

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  • Stainless steel composite plate for weathering-resistant steel bridge with low yield ratio
  • Stainless steel composite plate for weathering-resistant steel bridge with low yield ratio

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In this embodiment, the cladding material is ultra-low C stainless steel billet with micro-Ti added, the C content is 0.022%, and the Ti content is 0.015%. The specific components are shown in Table 1; shown. Finally, the thickness of the rolling base material is 58mm, the thickness of the cladding material is 2mm, and the stainless steel clad plate for weather-resistant steel bridges with a total thickness of 60mm.

[0023] The base material and cladding material continuous casting blanks are heated at a high temperature of 1230±20°C and then opened to the required size. After blanking, the upper surface of the base material is polished by abrasive belt to remove the surface oxide scale, and the entire surface of the board is completely exposed to the bright silver metallic luster; the cladding material does not need solid solution and pickling treatment, and its upper and lower surfaces are polished by abrasive belt, completely exposed For fresh metal, check that the...

Embodiment 2

[0026] In this example, the cladding material is a stainless steel blank with low C and added micro-Ti content. The C content is 0.030%, and the Ti content is 0.30%. Ti will preferentially combine with C to form TiC, which acts as a solid C and inhibits the combination of C and Cr to precipitate Cr. 23 C 6 , which improves the corrosion resistance of the cladding material. The specific composition of the cladding material is shown in Table 1. A certain amount of alloying elements such as Cr, Ni, and Cu are added to the substrate, and the atmospheric corrosion resistance index I=6.3. The specific composition is shown in Table 2. Finally, the thickness of the rolled base material is 5.5mm, the thickness of the cladding material is 0.5mm, and the stainless steel clad plate for weather-resistant steel bridges with a total thickness of 6mm.

[0027] The production process of the composite plate is the same as that of Example 1. The total thickness of the composite billet, the vacu...

Embodiment 3

[0029] In this embodiment, the cladding material is selected from ultra-low C stainless steel blanks with added micro-Ti content. The C content is 0.010%, and the Ti content is 0.012%. Elements, atmospheric corrosion resistance index I = 6.6, the specific composition is shown in Table 2. Finally, the thickness of the rolling base material is 20mm, the thickness of the cladding material is 3mm, and the stainless steel clad plate for weather-resistant steel bridges with a total thickness of 23mm.

[0030] The total thickness of the composite billet, the vacuum degree of the interface between the cladding material and the base material, and the rolling and cooling parameters of the composite billet are shown in Table 3. The total thickness of the rolled clad plate is 46mm. The rolled clad plate is subjected to tempering heat treatment, the tempering temperature is 450°C, and the tempering time is 160min. After the tempered composite board is cut on four sides, the upper and low...

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Abstract

The invention discloses a stainless steel composite plate for weathering-resistant steel bridge with a low yield ratio. The stainless steel composite plate comprises a base material and a covering material, wherein the atmospheric corrosion resistance index I is greater than or equal to 6.0, the total thickness is 5-60 mm, and the thickness of the covering material is 0.5-5.0 mm. The preparation method of the stainless steel composite plate comprises the steps of base covering material preparation, single-face blank making, symmetrical blank making, controlled rolling and controlled cooling, tempering heat treatment and plate splitting and straightening. According to the stainless steel composite plate, the composite interface bonding is good, the shear strength is larger than or equal to 300 MPa, and the stainless steel composite plate does not crack after being bent by 180 degrees; the yield ratio is less than or equal to 0.83; the impact energy of the base material at-40 DEG C is greater than or equal to 220 J; and after the covering material is subjected to intergranular corrosion, no intergranular corrosion phenomenon is found, and the covering material has excellent intergranular corrosion resistance.

Description

technical field [0001] The invention relates to a stainless steel composite plate, in particular to a stainless steel composite plate for a low yield ratio weather-resistant steel bridge and a preparation method thereof. Background technique [0002] The weather-resistant bridge steel and stainless steel composite plate are mainly used to prepare the bridge deck structure of the railway steel bridge. They are used together with the weather-resistant bridge steel to avoid the pollution caused by the paint brushing of the bridge deck structure, and the stainless steel layer of the composite plate can effectively Protect the bridge deck structure of railway steel bridges from being corroded by chloride ions, etc., so as to meet the requirements of long service life. Therefore, stainless steel composite panels for weather-resistant steel bridges have good application prospects. [0003] The existing stainless steel clad plates for railway steel bridges are basically clad plates...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50B23P15/00B32B15/01B32B15/18B32B33/00C21D1/18C21D6/00C21D8/02
CPCC22C38/02C22C38/04C22C38/48C22C38/46C22C38/50C22C38/42C22C38/44C22C38/001C22C38/06C21D1/18C21D6/004C21D6/005C21D6/008C21D8/0205C21D8/0221B23P15/00B32B15/18B32B15/011B32B33/00B32B2307/714B32B2307/54B23K2103/16B23K2103/04B23K9/16B23K9/18
Inventor 曾周燏江姗王光磊党军李东晖
Owner NANJING IRON & STEEL CO LTD
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