Cast-rolling method for restraining Cr element and Mo element of super-austenitic stainless steel from center segregation

A technology of austenitic stainless steel and super austenite, which is applied in the field of super austenitic stainless steel preparation, can solve problems such as unfavorable economic and environmental sustainable green development, increased material burning loss and energy consumption, and increased environmental tolerance. To achieve the effect of promoting sustainable green development, saving energy and reducing production processes

Active Publication Date: 2016-05-04
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aiming at the serious segregation of Cr and Mo elements and the precipitation of a large number of second phases in super austenitic stainless steel, there is no efficient solution at present. The main technical means for industrial production are: increasing the solution treatment temperature and increasing the solution treatment time. The solution treatment temperature is as high as 1200°C or even higher. The ...

Method used

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  • Cast-rolling method for restraining Cr element and Mo element of super-austenitic stainless steel from center segregation
  • Cast-rolling method for restraining Cr element and Mo element of super-austenitic stainless steel from center segregation
  • Cast-rolling method for restraining Cr element and Mo element of super-austenitic stainless steel from center segregation

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Embodiment 1

[0033] A casting-rolling method for suppressing central segregation of chromium and molybdenum elements in super austenitic stainless steel, comprising the following steps:

[0034] Step 1: Weigh the raw materials according to the composition ratio of super austenitic stainless steel, and keep each raw material at 200°C for 120 minutes. Among them, the composition mass percentage of super austenitic stainless steel strip is: C≤0.03%, N: 0.2 %, Si: 0.5%, Cu: 0.35%, Mn: 1.0%, Mo: 6.0%, Cr: 20%, Ni: 24%, P≤0.04%, S≤0.03%, the balance is Fe and unavoidable impurities;

[0035] Step 2: Classify each raw material, put it into a vacuum induction melting furnace step by step, and the vacuum degree is 5Pa, and smelt to obtain molten steel;

[0036] Step 3: Under the protection of high-purity nitrogen, pour molten steel into a twin-roll strip casting and rolling machine for casting and rolling. The pouring temperature is 1520°C, the casting and rolling speed is 27m / min, and the casting...

Embodiment 2

[0040] A casting-rolling method for suppressing central segregation of chromium and molybdenum elements in super austenitic stainless steel, comprising the following steps:

[0041] Step 1: Weigh the raw materials according to the composition ratio of super austenitic stainless steel, and keep each raw material at 200°C for 120 minutes. Among them, the composition mass percentage of super austenitic stainless steel is: C≤0.03, N: 0.2, Si: 0.5, Cu: 0.35, Mn: 1.0, Mo: 6.0, Cr: 20, Ni: 24, P≤0.04%, S≤0.03%, the balance is Fe and unavoidable impurities;

[0042] Step 2: Classify each raw material, put it into a vacuum induction melting furnace step by step, and the vacuum degree is 5Pa, and smelt to obtain molten steel;

[0043] Step 3: Under the protection of high-purity nitrogen, pour molten steel into a twin-roll strip casting and rolling machine for casting and rolling. The pouring temperature is 1520°C, the casting and rolling speed is 27m / min, and the casting and rolling for...

Embodiment 3

[0047] A casting-rolling method for suppressing central segregation of chromium and molybdenum elements in super austenitic stainless steel, comprising the following steps:

[0048] Step 1: According to the composition ratio of super austenitic stainless steel, weigh the raw materials, and keep each raw material at 200°C for 120 minutes. The composition mass percentage of super austenitic stainless steel is: C≤0.03, N: 0.2, Si: 0.5, Cu: 0.35, Mn: 1.0, Mo: 6.0, Cr: 20, Ni: 24, P≤0.04%, S≤0.03%, the balance is Fe and unavoidable impurities;

[0049] Step 2: Classify each raw material, put it into a vacuum induction melting furnace step by step, and the vacuum degree is 5Pa, and smelt to obtain molten steel;

[0050] Step 3: Under the protection of high-purity nitrogen, pour molten steel into a twin-roll thin strip casting and rolling machine for casting and rolling. The pouring temperature is 1520°C, the casting and rolling speed is 27m / min, and the casting and rolling force is ...

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Abstract

The invention discloses a cast-rolling method for restraining a Cr element and a Mo element of super-austenitic stainless steel from center segregation and belongs to the technical field of manufacturing of the super-austenitic stainless steel. The method includes the steps that (1) raw materials are weighed according to the composition proportion of the super-austenitic stainless steel, and the raw materials are subjected to heat preservation at the temperature ranging from 150 DEG C to 250 DEG C for 100 minutes to 150 minutes; (2) the raw materials are sorted and placed into a vacuum induction melting furnace step by step to obtain molten steel by being smelted; and (3) the molten steel is poured into a dual-roll thin strip cast-rolling machine for cast rolling under shielding of high-purity nitrogen, and a thin super-austenitic stainless steel strip 2.0-3.0 mm thick is obtained, wherein the pouring temperature ranges from 1450 DEG C to 1550 DEG C, the cast-rolling speed ranges from 10 m/min to 40 m/min, and the cast-rolling force ranges from 30 kN to 70 kN. According to the manufactured thin super-austenitic stainless steel strip, center segregation of the Cr element and the Mo element is restrained, and on the premise of maintaining the plasticity, the yield strength is improved by 5%-10% compared with that of traditional strip steel of the same specification as the thin super-austenitic stainless steel strip. Meanwhile, the cast-rolling method reduces energy consumption and production cost, improves the utilization rate of materials and reduces environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of super austenitic stainless steel preparation, and in particular relates to a casting and rolling method for suppressing central segregation of chromium and molybdenum elements in super austenitic stainless steel. Background technique [0002] Super austenitic stainless steel is a kind of high-alloyed stainless steel. Its thin-gauge cold-rolled sheet has a wide range of applications in harsh environments such as chemistry, pharmaceuticals, petrochemicals, and power plants. Compared with ordinary austenitic stainless steel, super austenitic stainless steel contains a large amount of alloying elements such as Cr, Ni, Mo, etc., which makes it have higher strength, toughness and plasticity, and excellent welding performance. The substantial improvement of corrosion resistance in this medium meets the needs of users for materials that can resist harsh environments, making the application range and demand for su...

Claims

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Application Information

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IPC IPC(8): C22C38/44C22C38/58C22C38/02C22C38/42C22C30/00C22C30/02B22D11/06
CPCB22D11/0697C22C30/00C22C30/02C22C38/001C22C38/02C22C38/42C22C38/44C22C38/58
Inventor 刘振宇郝燕森赵岩李晓理刘鑫高飞曹光明李成刚王国栋
Owner NORTHEASTERN UNIV
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