Ultra-wide economical duplex stainless steel medium plate and manufacturing method thereof

A duplex stainless steel, energy-saving technology, applied in the direction of improving process efficiency, can solve the problems of not considering the influence of stainless steel surface, not considering the continuous casting process and on-line heat treatment process and the quality of the steel plate, so as to reduce surface scratches and pressure Pit, reduced manufacturing cost, beneficial to the effect of coordinated deformation

Active Publication Date: 2019-11-15
ANGANG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method does not consider optimizing the steelmaking, continuous casting process and on-line heat treatment process to improve the quality of th

Method used

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  • Ultra-wide economical duplex stainless steel medium plate and manufacturing method thereof
  • Ultra-wide economical duplex stainless steel medium plate and manufacturing method thereof
  • Ultra-wide economical duplex stainless steel medium plate and manufacturing method thereof

Examples

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Example Embodiment

[0024] The following embodiments are used to specifically illustrate the content of the present invention, and these embodiments are only a general description of the content of the present invention, and do not limit the content of the present invention.

[0025] Table 1 is the chemical composition of the example steel, Table 2 is the smelting process system of the example steel, Table 3 is the processing method of the example steel casting billet; Table 4 is the rolling method of the example steel; Table 5 is the example The reduction rate of each pass of the steel; Table 6 is the pre-straightening and laminar cooling process of the example steel; Table 7 is the performance of the example stainless steel.

[0026] Table 1 The chemical composition of the embodiment of the present invention (wt, %)

[0027] ExampleC Si Mo MnCr NiNB CaV Als 10.0260.570.514.319.21.270.230.00260.00110.0410.023 20.0230.510.234.7521.81.590.260.00350.00150.0370.021 30.0210.620.174.8620.21.390.220.0035...

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Abstract

The invention discloses an ultra-wide economical duplex stainless steel medium plate and a manufacturing method thereof. The medium axial crystal proportion of a continuous casting billet is not lowerthan 80%; the surface roughness Ra of the casting billet is smaller than or equal to 50 [mu]m, and high-temperature antioxidant coating is sprayed; the preheating section temperature of the casting billet is 960-1100 DEG C, the heating section temperature is 1150-1230 DEG C, and the soaking section temperature is 1220-1250 DEG C; the rough rolling starting temperature is larger than or equal to 1150 DEG C, the first pass reduction amount is larger than or equal to 25%, the subsequent pass reduction amount is smaller than or equal to 20%, the roller speed is 40-70 r/min, and the thickness of an intermediate blank is 60-120 mm; the finish rolling start temperature is larger than or equal to 1050 DEG C, the finish rolling temperature is larger than or equal to 950 DEG C, the rolling reduction rate is smaller than or equal to 20%, product specifications are 2800-4000 mm wide and 20-60 mm thick, and the surface crack rejection rate is decreased from above 10% to below 1.5%. The product iswidely applied to the engineering fields of nuclear power, oil and gas, shipbuilding, papermaking, seawater desalination and the like.

Description

technical field [0001] The invention relates to the technical field of duplex stainless steel plate rolling, in particular to an ultra-wide and economical duplex stainless steel plate and a manufacturing method thereof. Background technique [0002] With the rapid development of domestic shipbuilding, chemical industry, nuclear power, shipbuilding industry and other industries in recent years, the demand for low-cost duplex stainless steel plates with high strength and excellent corrosion resistance is increasing day by day. , Higher toughness, no room temperature brittleness, good intergranular corrosion resistance and welding performance, so it is widely used in the fields of petroleum, chemical industry and nuclear power. Due to the poor thermoplasticity of economical duplex stainless steel, hot forming is restricting its ability A key factor for successful production. At present, there is an increasing demand for wide and large-size economical stainless steel hot-rolled...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/06C22C38/44C22C38/46C22C38/54C22C38/58B22D11/115C21D8/02C22C33/04
CPCB22D11/115C21D8/0205C21D8/0226C21D8/0263C21D8/0278C21D8/0284C21D2211/001C21D2211/005C22C33/04C22C38/001C22C38/02C22C38/06C22C38/44C22C38/46C22C38/54C22C38/58Y02P10/20
Inventor 徐海健沙孝春韩楚菲隋松言刘文华王文仲石锋涛
Owner ANGANG STEEL CO LTD
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