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Hot-rolled chrome molybdenum low-alloy steel antirust production method

A chromium-molybdenum low-alloy and low-alloy steel technology, which is applied to special surfaces, pre-treated surfaces, and devices for coating liquids on surfaces, can solve problems such as easy rusting on the surface, and achieve easy rusting and good social benefits and environmental benefits

Active Publication Date: 2018-11-02
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the surface of hot-rolled chromium-molybdenum low-alloy steel products is prone to rust, and it is necessary to develop a production process for long-term rust prevention of hot-rolled chromium-molybdenum low-alloy steel products

Method used

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  • Hot-rolled chrome molybdenum low-alloy steel antirust production method

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Effect test

Embodiment 1

[0040] The composition of a hot rolled chromium molybdenum low alloy steel is C: 0.1, Mn: 0.45, P: 0.003, S: 0.030, Si: 0.6, Cr: 1.2, Mo: 0.55.

[0041] The process steps of the present invention mainly include a roller brushing process section, a surface cleaning process section, an antirust agent spraying process section and a heating and purging process section.

[0042] The annealed hot-rolled chromium-molybdenum low-alloy steel plate enters the roller brush process section through the pinch roller on the roller table. The diameter of the upper and lower brush rollers is 350mm and the length is 2450mm. The material of the roller shaft of the brush roller is 40Cr (tempered heat treatment). The material is nylon + alumina abrasive, and the abrasive content gradually decreases from front to back. The upper and lower brush rollers are active rollers, which are installed in a closed brush roller frame, and a pneumatic blowing device and a dust removal system are arranged in the...

Embodiment 2

[0048] The composition of hot-rolled chromium-molybdenum low-alloy steel is C: 0.15, Mn: 0.75, P: 0.004, S: 0.036, Si: 0.7, Cr: 1.5, Mo: 0.65.

[0049] The process steps of the present invention include a roller brushing process section, a surface cleaning process section, an antirust agent spraying process section and a heating and purging process section.

[0050]The annealed hot-rolled chromium-molybdenum low-alloy steel plate enters the roller brush process section through the pinch roller on the roller table. The diameter of the upper and lower brush rollers is 450mm and the length is 2500mm. The material of the roller shaft of the brush roller is 35CrMo (tempered heat treatment). The material is nylon + silicon carbide abrasive, and the abrasive content gradually decreases from front to back. The upper and lower brush rollers are active rollers, which are installed in a closed brush roller frame, and a pneumatic blowing device and a dust removal system are arranged in th...

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Abstract

A hot-rolled chrome molybdenum low-alloy steel antirust production method comprises the steps that in the roller brush technology section, an annealed hot-rolled chrome molybdenum low-alloy steel plate enters the roller brush technology section; the surface cleaning technology section is conducted; the antirust agent spraying technology section is conducted, and then the steel plate enters the antirust agent spraying technology section, antirust agent spraying liquid is pure water containing 3-8 g / L of poly-diethanol amine, 6-9g / L of polyvinylamine and 30-50 mg / L of polyaspartic acid; and finally, the heating purging technology section is conducted, finally, the hot-rolled chrome molybdenum low-alloy steel enters the purging technology section, purging gas in the heating purging technologysection is compressed air, the temperature of the compressed air ranges from 65 DEG C to 80 DEG C, and the spraying pressure is 0.2-5 MPa. According to the hot-rolled chrome molybdenum low-alloy steel antirust production method, the hot-rolled chrome molybdenum low-alloy steel does not rust for 72 h under the conditions that the temperature is 49 DEG C and the relative humidity is 98%; and the problem that hot-rolled chrome molybdenum low-alloy steel is prone to rusting is effectively solved.

Description

technical field [0001] The invention belongs to the technical field of hot rolling, and in particular relates to a production method of a long-acting antirust hot-rolled chromium-molybdenum low-alloy steel hot-rolled plate. Background technique [0002] As my country's basic industry, the iron and steel industry has developed rapidly since the reform and opening up, and has been in a high-speed development stage in recent years. [0003] Chromium-molybdenum steel is a commonly used steel for pressure vessels. It is widely used in oil refining, chemical industry, and hydrogenation units of various hydrogenation units and reforming units. The addition of alloy elements such as Cr and Mo to this steel type significantly improves the material strength. High temperature strength limit and creep limit, with good high temperature resistance strength, is the steel of choice for high temperature and high pressure vessel shells and heads. [0004] However, the surface of hot-rolled c...

Claims

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Application Information

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IPC IPC(8): B05D5/00B05D3/00B05D3/04B05D7/14C22C38/02C22C38/04C22C38/22C22C38/60
CPCB05D3/002B05D3/0406B05D5/00B05D7/14B05D2202/10B05D2350/30B05D2518/00C22C38/02C22C38/04C22C38/22C22C38/60B05D2401/20
Inventor 范群杨征李恩超祁庆琚杨峰王学敏
Owner BAOSHAN IRON & STEEL CO LTD
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