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Steel tube and production technique thereof

A production process and steel pipe technology, applied in the field of steel pipe and its production process, can solve the problems of reducing the corrosion resistance of stainless steel, and achieve the effects of preventing intergranular corrosion, good strength and corrosion resistance, good strength and toughness

Inactive Publication Date: 2011-05-25
苏州奕欣特钢管业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a steel pipe that solves the problem that the chromium carbide content will reduce the corrosion resistance of stainless steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: The steel pipe of the present invention is composed of Fe, C, Mn, P, S, Si, Ni, Cr, N, Ti, in terms of mass percentage relative to Fe: C=0.10, Mn=1.50, P =0.040, S=0.030, Si=1.00, Ni=0.5, Cr=23, N=0.20, Ti=0.05 prepared and processed.

Embodiment 2

[0028] Example 2: The steel pipe of the present invention is composed of Fe, C, Mn, P, S, Si, Ni, Cr, N, Ti, according to the mass percentage relative to Fe: C=0.08, Mn=1.40, P =0.03, S=0.02, Si=0.8, Ni=0.4, Cr=24, N=0.15, Ti=0.04 prepared and processed.

Embodiment 3

[0029] Example 3: The steel pipe of the present invention is composed of Fe, C, Mn, P, S, Si, Ni, Cr, N, Ti, according to the mass percentage relative to Fe: C=0.05, Mn=0.6, P =0.02, S=0.01, Si=0.6, Ni=0.3, Cr=25, N=0.1, Ti=0.03 prepared and processed.

[0030] The steel pipe smelting method of the present invention combines an electric arc furnace (EAF) and a refining furnace (AOD) and includes the following steps:

[0031] Step 1, smelting. Preferably, the smelting adopts the return method smelting, which specifically includes the following sub-steps:

[0032] (1) The electric arc furnace (EAF) melts more than 80%, preferably, oxygen is used to boost the melt during the melt to ensure the loss of chromium and the burning of steel materials.

[0033] (2) After melting, take a sample at a temperature of 1650°C or higher, and analyze and adjust the composition. Preferably, the adjusting composition refers to adding various alloy amounts to achieve the target according to the data obta...

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PUM

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Abstract

The invention relates to a steel tube which is characterized by comprising Fe, C, Mn, P, S, Si, Ni, Cr, N and Ti, wherein in terms of the percentage by mass of Fe, the contents of C, Mn, P, S, Si, Ni, Cr, N and Ti are as follows: 0.03%<=C<=0.12%, 0.5%<=Mn<=1.6%, 0.01%<=P<=0.05%, 0.005%<=S<=0.04%, 0.4%<=Si<=1.2%, 0.2%<=Ni<=0.6%, 22%<=Cr<=26%, 0.05%<=N<=0.25% and 0.02%<=Ti<=0.06%. In the steel tube, manganese and nitrogen are used instead of part of nickel to lower the production cost, and the steel tube has the advantages of high strength and favorable corrosion resistance; the contents of the chromium and carbon in the steel tube are properly increased at the same time, thereby not only meeting the requirements for hardness and wearability, but also giving consideration to certain corrosion resistance; and since the titanium is added to the steel tube, intercrystalline corrosion can be properly prevented. Based on the advantages, the steel tube can be widely used as a high-temperature component, a fastener or the like.

Description

Technical field [0001] The invention relates to a steel pipe and its production process, in particular to a stainless steel seamless steel pipe in the metallurgical industry. Background technique [0002] Stainless steel is the general term for stainless steel, heat-resistant steel, and acid-resistant steel. Stainless steel can be divided into two categories according to its composition. One is simple chromium steel with more than 12% chromium, and the other is simple chromium steel with more than 12% chromium in quantum mechanics, and other elements are added. [0003] Chromium carbide based on the combination of carbon and chromium will reduce the corrosion resistance of stainless steel, so the carbon content of stainless steel is low, and it is generally too early to contain carbon. Within the range of 0.1% to 0.2%, no more than 0.4%. [0004] my country's nickel resources and stainless steel scrap resources lack characteristics. Expanding the variety and production proportion o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50C22C38/58C21C5/52C21C7/068
CPCY02P10/20
Inventor 王德元庄为民范伟昌文茂广穆志强
Owner 苏州奕欣特钢管业有限公司
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