Method for eliminating surface cracks of ultra-wide high-nitrogen austenitic stainless steel medium thick plate

A high-nitrogen austenite and surface crack technology, which is applied in the direction of workpiece surface treatment equipment, process efficiency improvement, metal rolling, etc., can solve the problems of not considering the width ratio, not considering, not considering the influence of stainless steel surface, etc. Achieve the effects of improving surface quality, reducing the tendency of cracks, and increasing the equiaxed crystal ratio

Active Publication Date: 2019-11-12
ANGANG STEEL CO LTD
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Problems solved by technology

However, this method does not consider optimizing the steelmaking and continuous casting process to improve the proportion of equiaxed grains in the continuous casting slab, and does not consider the impact of gri

Method used

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  • Method for eliminating surface cracks of ultra-wide high-nitrogen austenitic stainless steel medium thick plate
  • Method for eliminating surface cracks of ultra-wide high-nitrogen austenitic stainless steel medium thick plate
  • Method for eliminating surface cracks of ultra-wide high-nitrogen austenitic stainless steel medium thick plate

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Embodiment Construction

[0024] The following examples are used to specifically illustrate the contents of the present invention, and these examples are only general descriptions of the contents of the present invention, and do not limit the contents of the present invention.

[0025] Wherein Table 1 is the chemical composition of embodiment steel, and Table 2 is the smelting process system of embodiment steel, and Table 3 is the processing method of embodiment steel slab; Table 4 is the descaling method of embodiment steel; Table 5 is embodiment The rolling method of the steel; Table 6 is the reduction of each pass of the steel of the embodiment; Table 7 is the solid solution process of the steel of the embodiment; Table 8 is the performance of the stainless steel of the embodiment.

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

[0027] Example C Si mn Cr Ni N Ca als 1 0.026 0.35 1.65 18.6 11.2 0.12 0.0011 0.021 2...

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Abstract

The invention discloses a method for eliminating surface cracks of an ultra-wide high-nitrogen austenitic stainless steel medium thick plate. The isometric crystal proportion in a continuous casting blank is not lower than 85%; the surface roughness degree Ra of the casting blank after being subjected to repairing grinding is smaller than or equal to 100 microns, and high-temperature anti-oxidizing coating is sprayed; after being treated through a pre-heating segment at a temperature of 980-1100 DEG C, a heating segment at a temperature of 1100-1230 DEG C, and a soaking zone at a temperature of 1200-1230 DEG C in sequence, the casting blank is discharged out of a furnace, and the in-furnace time is 3-4 h; the initial rolling temperature in the first stage is larger than or equal to 1150 DEG C, and the final rolling temperature is larger than or equal to 950 DEG C; and the initial rolling temperature in the second stage is larger than or equal to 1120 DEG C, the final rolling temperature is larger than or equal to 950 DEG C, a high-temperature solid solution temperature is 980-1050 DEG C, the in-furnace time is 2-5 min/mm, and water cooling is performed till a room temperature is achieved. A product width is 2200-4000 mm, and the thickness is 20-60 mm. A surface crack rejection ratio is lowered to be 2% or below from 10% or above. A product is suitable for a structural part highin toughness and high in strength and bearing an impacting load.

Description

technical field [0001] The invention relates to the technical field of austenitic stainless steel plate rolling, in particular to a method for eliminating surface cracks of an ultra-wide high-nitrogen austenitic stainless steel plate. Background technique [0002] With the rapid development of domestic wind tunnel laboratory construction for large aircraft experiments, water vapor pressure vessels, nuclear power safety equipment, shipbuilding industry and other industries in recent years, the medium thickness of austenitic stainless steel with high low temperature tensile strength and high toughness The demand for plates is increasing day by day. Nitrogen-containing austenitic stainless steel is widely used in the fields of petroleum, chemical industry, aerospace and energy due to its good ductility, cold and hot processing performance and local corrosion resistance at high and extremely low temperatures. , These fields require materials to be used at a temperature as low as...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/06C22C38/02B22D11/115C21D1/70C21D8/02C21D1/26B21C37/02B21B45/08B21B45/00B21B1/22
CPCB21B1/22B21B45/004B21B45/08B21C37/02B22D11/115C21D1/26C21D1/70C21D8/0205C21D8/0226C21D2211/001C22C38/001C22C38/002C22C38/02C22C38/06C22C38/58Y02P10/20
Inventor 徐海健沙孝春闵承鑫石锋涛韩楚菲王文仲王东旭
Owner ANGANG STEEL CO LTD
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