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Martensite heat-resistant steel and grain display method thereof

A display method and technology of heat-strength steel, applied in the fields of machinery, aerospace, metallurgy, metal material micro, chemical industry, aviation, energy, etc., can solve the problem of non-appearance of grain boundaries, and achieve the solution of non-corrosion, convenient structure inspection, good mechanics performance effect

Active Publication Date: 2017-05-31
CENT IRON & STEEL RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a martensitic heat-strength steel and a method for displaying its grain size. This method can solve the problem that the grain boundary does not appear when detecting the grain size of the martensitic heat-strength steel, and has the advantage of not needing heating during corrosion. Corrosive solution, this method has the characteristics of simple operation and easy mastery

Method used

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  • Martensite heat-resistant steel and grain display method thereof
  • Martensite heat-resistant steel and grain display method thereof
  • Martensite heat-resistant steel and grain display method thereof

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with a typical embodiment.

[0022] In this embodiment, a 1-ton vacuum induction furnace is used for smelting, and 6 furnaces are smelted successively, and each steel ingot weighs about 1 ton.

[0023] Table 1 Chemical composition (wt %) of the embodiment of the present invention

[0024]

[0025]The specific composition of the smelted 6-heat martensitic heat-strength steel is shown in Table 1. After quenching the parts made of 6 heats of steel, cut cylindrical samples of Ф15mm×15mm from the workpiece respectively. Put the sample into a heat treatment furnace, heat it at 700-720°C for 30-40 minutes, and then put it in water to cool. The temperature and time of reheating the samples of these 6 heats of steel are shown in Table 2. Then these 6 samples were polished on metallographic sandpaper of 200 mesh, 500 mesh, 800 mesh and 1000 mesh respectively, polished on a metallographic polishing machine,...

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Abstract

The invention relates to martensite heat-resistant steel and a grain display method thereof and belongs to the field of metal material micro-technology. The steel comprises the chemical components, by weight, of 0.05%-0.15% of C, 0.7% or the less of Si, 0.8% or the less of Mn, 0.020% or the less of P, 0.020% or the less of S, 13.0%-15.0% of Cr, 4.0%-4.5% of Ni, 2.0%-2.5% of Mo, 3.0%-4.0% of W, 0.15%-0.35% of Nb, 0.30%-0.35% of N and the balance Fe and inevitable impurities. A cylindrical specimen with phi being 15 mm x15 mm is cut on a quenched workpiece. The specimen is put into a heat treating furnace at the temperature of 700-720 DEG C to be heated for 30-40 minutes, and then put into water to be cooled. A grain size specimen is polished on metallographical sand paper with the meshes being 200, 500, 800 and 1000 separately and buffed on a metallographical buffing machine. The surface of the specimen is observed, after the surface of the specimen is free from scratches visible to naked eyes and defects, corrosion is conducted. The martensite heat-resistant steel and the grain display method thereof have the advantages that the problem that when the grain size of the martensite heat-resistant steel is detected, grain boundaries do not occur can be solved, corrosion liquid does not needed to be heated at the time of corrosion, the operation is easy and the method is easy to master.

Description

technical field [0001] The invention belongs to the field of metal material microtechnology, and in particular relates to a martensitic heat-strength steel and a grain display method thereof, which are mainly applicable to the fields of metallurgy, machinery, energy, aviation, aerospace, chemical industry and the like. Background technique [0002] Martensitic heat-strength steel is an important type of heat-resistant steel, and heat-resistant steel is an important type of heat-resistant steel. Heat-resistant steel can be divided into heat-strength steel, valve steel and oxidation-resistant steel (also known as anti-oxidation and non-skinning steel) according to performance and use. Valve steel is also called valve steel, which mainly refers to the steel used to manufacture the intake and exhaust valves of internal combustion engines. Such steels are required to have good high-temperature strength, high-temperature hardness, creep resistance and flue gas corrosion resistanc...

Claims

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Application Information

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IPC IPC(8): C22C38/44C22C38/48C22C38/04C22C38/02G01N1/32G01N15/02C23F1/28C21D6/00
CPCC21D6/004C21D2211/008C22C38/001C22C38/02C22C38/04C22C38/44C22C38/48C23F1/28G01N1/32G01N15/02
Inventor 王立民杨钢刘正东包汉生梁永存何西扣赵吉庆李权程杰锋唐广波
Owner CENT IRON & STEEL RES INST
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