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A Casting and Rolling Method for Eliminating Delta Ferrite in Maraging Stainless Steel Strip

A technology of delta ferrite and stainless steel, which is applied in the field of casting and rolling to eliminate delta ferrite in maraging stainless steel strips, can solve problems such as deterioration of performance, reduce surface defects, improve corrosion resistance and service life And safety, the effect of improving strength

Active Publication Date: 2016-09-28
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no technical solution to the problem that δ ferrite is easily formed inside the structure of some maraging stainless steels during the traditional casting and pouring process, thereby deteriorating the performance.

Method used

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  • A Casting and Rolling Method for Eliminating Delta Ferrite in Maraging Stainless Steel Strip
  • A Casting and Rolling Method for Eliminating Delta Ferrite in Maraging Stainless Steel Strip
  • A Casting and Rolling Method for Eliminating Delta Ferrite in Maraging Stainless Steel Strip

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] To prepare a maraging stainless steel strip with a thickness of 1.0mm, the process steps are as follows:

[0030](1) According to the mass percentage: C 0.007, N 0.01, Mn 0.32, Si 0.15, Al 0.33, Cr 12, Ni 9, Mo 4, Cu 2, Ti 1, the balance is Fe and the chemical composition of unavoidable impurities Select raw materials, heat the raw materials to 100°C and keep them warm for 120 minutes, put them into a vacuum induction melting furnace, and smelt them in a vacuum environment with a vacuum degree of 0.1-1Pa to obtain molten steel;

[0031] (2) Under the protection of argon, molten steel is poured into a twin-roll thin strip casting and rolling machine for casting and rolling, wherein the pouring temperature is 1520°C, the casting and rolling speed is 30m / min, and the casting and rolling force is 50kN, and finally a steel sheet with a thickness of 1.0mm is obtained. Thin strip of maraging stainless steel.

[0032] In addition, a thin strip of maraging stainless steel with ...

Embodiment 2

[0035] To prepare a maraging stainless steel strip with a thickness of 1.5mm, the process steps are as follows:

[0036] (1) According to the mass percentage: C 0.01, N 0.01, Mn 0.5, Si 0.3, Al 0.2, Cr 11, Ni 8, Mo 3.5, Cu 1.5, Ti 1.5, the balance is the chemical composition of Fe and unavoidable impurities Select raw materials, heat the raw materials to 150°C and keep them warm for 120 minutes, put them into a vacuum induction melting furnace, and smelt them in a vacuum environment with a vacuum degree of 0.1-1Pa to obtain molten steel;

[0037] (2) Under the protection of argon, molten steel is poured into a twin-roll thin strip casting and rolling machine for casting and rolling, wherein the pouring temperature is 1500°C, the casting and rolling speed is 30m / min, and the casting and rolling force is 50kN, and finally a steel sheet with a thickness of 1.5mm is obtained. Thin strip of maraging stainless steel.

[0038] In addition, a maraging stainless steel thin strip havin...

Embodiment 3

[0041] To prepare a maraging stainless steel thin strip with a thickness of 2.0 mm, the process steps are as follows:

[0042] (1) According to the mass percentage: C 0.01, N 0.01, Mn 0.2, Si 0.5, Al 0.4, Cr 13, Ni 10, Mo 4, Cu 1.5, Ti 0.5, the balance is the chemical composition of Fe and unavoidable impurities Select raw materials, heat the raw materials to 100°C and keep them warm for 120 minutes, put them into a vacuum induction melting furnace, and smelt them in a vacuum environment with a vacuum degree of 0.1-1Pa to obtain molten steel;

[0043] (2) Under the protection of argon, molten steel is poured into a twin-roll thin strip casting and rolling machine for casting and rolling, wherein the pouring temperature is 1480°C, the casting and rolling speed is 30m / min, and the casting and rolling force is 50kN, and finally a steel sheet with a thickness of 2.0mm is obtained. Thin strip of maraging stainless steel.

[0044] In addition, a maraging stainless steel thin strip ...

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Abstract

The invention provides a casting and rolling method for eliminating delta ferrite in maraging stainless steel strips, and belongs to the technical field of metal material processing. According to the mass percentage of the present invention, they are: C≤0.01, N≤0.01, Mn≤0.5, Si≤0.5, Al 0.2~0.4, Cr 11~13, Ni 8~10, Mo 3.5~4, Cu 1.5~2, Ti 0.5 ~1.5, the balance is Fe and the chemical composition of inevitable impurities. Select the raw materials. The raw materials undergo two process steps of vacuum smelting and high-temperature casting and rolling to prepare a maraging stainless steel strip without delta ferrite. The strength, plasticity and toughness of the steel strip are improved. Compared with the steel strip prepared by the traditional process, the yield strength is increased by 8 to 10%, and the room temperature impact toughness is increased by 10 to 15%. At the same time, the invention can reduce energy consumption and production costs, and reduce environmental pollution. .

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and in particular relates to a casting and rolling method for eliminating delta ferrite in maraging stainless steel thin strips. Background technique [0002] Martensitic stainless steel is a class of stainless steel whose properties can be adjusted by heat treatment (quenching, tempering). According to the difference of alloying elements in steel, martensitic stainless steel can be divided into two types: martensitic chromium stainless steel and martensitic chromium-nickel stainless steel. Among them, according to the structure and strengthening mechanism of steel, martensitic chromium-nickel stainless steel can be divided into ordinary martensitic chromium-nickel stainless steel, martensitic and semi-austenitic (or semi-martensitic) precipitation hardening stainless steel and martensitic stainless steel. Tempered stainless steel. Maraging stainless steel is an ultra-low carb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02B21B1/46C22C38/50
Inventor 高飞于福晓刘振宇郝艳森李成刚曹光明
Owner NORTHEASTERN UNIV LIAONING
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