Method for producing ferrite stainless steel pipe

A stainless steel and ferrite technology, applied in the field of stainless steel, can solve the problems of decreased hot working performance, decreased toughness and welding performance, and reduced steel strength.

Inactive Publication Date: 2012-03-07
刘群联
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Disclosed as CN1363710 is a method for manufacturing ferritic stainless steel pipes with good processability and its manufacturing method. Decreased toughness and weldability
Another example is CN1507500, which discloses a method for manufacturing ferritic stainless steel pipes with good shape solidification and its manufacturing method, wherein, in order to improve the shape solidification of the steel plate, Mo and Cu are added to the steel, and the C content is adjusted. imposes severe constraints, making manufacturing cost prohibitive
In addition, the steel grade disclosed in JP2001003143 restricts the N content to improve the workability and surface, but its Si content control is low, which reduces the strength of the steel. performance drop
[0005] It can be seen that the method for manufacturing ferritic stainless steel pipes in the prior art can not fully meet the requirements of current use and manufacture, and it is necessary to develop a method for manufacturing ferritic stainless steel pipes with high strength, good welding performance and low cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Raw material smelting-casting billet-heat centering-perforation to obtain capillary-wall reduction-sizing-inspection-rust prevention-packing to obtain the finished ferritic stainless steel pipe; the composition of the steel pipe includes the following weight components: C≤ 0.015%, N≤0.015%, Si 0.3%, Mn 0.3%, Cr 18%, P≤0.03%, S≤0.01%, 0≤0.002%, Ti0.02%, and the balance is iron and unavoidable impurities.

Embodiment 2

[0019] The raw materials are smelted by electric furnace or electric furnace and hydrogen oxygen furnace, and then refined in vacuum refining furnace to obtain molten steel with satisfactory composition-casting billet-heat centering-perforation to get capillary-wall reduction-sizing-inspection-rust prevention-packaging The finished ferritic stainless steel pipe is obtained; the composition of the steel pipe is as follows: C≤0.010%, N≤0.010%, Si 0.3%, Mn 0.4%, Cr 20%, P≤0.02%, S≤ 0.01%, 0≤0.002%, Nb0.02%, the balance is iron and unavoidable impurities.

Embodiment 3

[0021] Raw material smelting-casting adopts continuous casting or mold casting. By controlling the casting speed of 0.9-1.1m / min in the continuous casting process and strengthening the electromagnetic stirring current of 1000-1600 amperes, the continuous casting slab with equiaxed crystal ratio of not less than 50% is obtained. After die-casting, initial rolling into a billet is cast into a billet-heat centering-perforation to obtain a capillary tube-reduction of the wall-calibration-inspection-rust prevention-packaging to obtain a finished ferritic stainless steel pipe; the composition of the steel pipe is as follows: Min: C≤0.015%, N≤0.015%, Si 0.5%, Mn 0.7%, Cr 25%, P≤0.03%, S≤0.01%, 0≤0.002%, Ti0.02%, Nb0.01%, Yu The amount is iron and unavoidable impurities.

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PUM

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Abstract

The invention discloses a method for producing a ferrite stainless steel pipe. The method is characterized in steps of: raw material smelting, shaped billet casting, hot centering, perforating and blank pipe obtaining, wall thinning, sizing, testing, rust preventing, and packaging. The steel pipe comprises components of, by weight: no more than 0.015% of C, no more than 0.015% of N, 0.3-0.5% of Si, 0.3-0.7% of Mn, 17-25% of Cr, no more than 0.03% of P, no more than 0.01% of S, no more than 0.002% of O, and balance of Fe and inevitable impurities. Compared to prior arts, the method provided by the invention has substantial technical advancements and important economic significance. The method is suitable for industrial popularization and application.

Description

technical field [0001] The present invention relates to a stainless steel, more specifically to a method for manufacturing a ferritic stainless steel pipe and a manufacturing method thereof. Background technique [0002] Ferritic stainless steel refers to stainless steel with a chromium content of 11%-30%, a body-centered cubic crystal structure, and a ferrite-based structure in use. [0003] The method of manufacturing ferritic stainless steel pipe does not contain nickel or only contains a small amount of nickel, which is a nickel-saving stainless steel. In addition to its stainless and general corrosion resistance, it has excellent local corrosion resistance such as chloride stress corrosion resistance, pitting corrosion resistance, and crevice corrosion resistance. In addition, the method of manufacturing ferritic stainless steel pipes has high strength, low cold work hardening tendency, thermal conductivity of 130%-150% of austenitic stainless steel, and linear expansi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C22C38/28C22C38/26C22C38/22C21D8/10
Inventor 刘群联
Owner 刘群联
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