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A kind of martensitic stainless steel and its manufacturing method

A martensitic stainless steel and a manufacturing method technology, applied in the field of martensitic stainless steel and its manufacturing, can solve the problems of difficult to guarantee machinability and high cost, and achieve improved free cutting and machinability, good toughness, and high room temperature strength. Effect

Active Publication Date: 2016-04-27
宝武特种冶金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent obtains good toughness through high nickel content and extremely low sulfur content control, and good corrosion resistance by adding molybdenum, but its cost is high and machinability is difficult to guarantee

Method used

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  • A kind of martensitic stainless steel and its manufacturing method
  • A kind of martensitic stainless steel and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Using electric furnace + AOD + LF melting, casting into 200mm continuous casting slab, heating temperature 1120 ℃, furnace time 220min, final rolling temperature controlled at 990 ℃, hot rolled plate thickness 30mm, rapid cooling to 200 ℃ at a speed of 0.8 ℃ / s Then, air-cool to room temperature, perform high-temperature tempering heat treatment at 720°C for 180 minutes, and obtain martensitic stainless steel plates after pickling. The sheet has excellent strength at room temperature and medium temperature and good toughness, and its good machinability is ensured by controlling the content of calcium and sulfur. All properties are listed in Table 2.

Embodiment 2

[0048] Using electric furnace + AOD + LF melting, casting into 150mm continuous casting slab, heating temperature 1150℃, time in furnace 160min, final rolling temperature controlled at 1010℃, hot rolled plate thickness 20mm, rapid cooling to 200℃ at a speed of 1.0℃ / s Then, air-cool to room temperature, perform high-temperature tempering heat treatment at 740°C for 140 minutes, and obtain a martensitic stainless steel plate after pickling. The sheet has excellent strength at room temperature and medium temperature and good toughness, and its good machinability is ensured by controlling the content of calcium and sulfur. All properties are listed in Table 2.

Embodiment 3

[0050] Using electric furnace + AOD + LF melting, mold casting 365mm slab, heating temperature 1100°C, time in furnace 420min, final rolling temperature controlled at 970°C, hot rolled plate thickness 40mm, rapid cooling to below 200°C at a speed of 0.6°C / s , and then air-cooled to room temperature, high-temperature tempering heat treatment at 710°C for 240 minutes, and pickling to obtain a martensitic stainless steel plate. The sheet has excellent strength at room temperature and medium temperature and good toughness, and its good machinability is ensured by controlling the content of calcium and sulfur. All properties are listed in Table 2.

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Abstract

The invention relates to martensitic stainless steel and a manufacturing method thereof. The martensitic stainless steel comprises the following chemical components in percentage by weight: 0.05-0.10% of C, no more than 1.0% of Si, 0.5-1.2% of Mn, no more than 0.035% of P, 0.02-0.05% of S, 0.3-0.8% of Ni, 12.5-14.0% of Cr, 0.2-0.7% of Mo, 0.02-0.05% of N, 0.001-0.003% of Ca, 0.08-0.12% of C+N and the balance of Fe and inevitable impurities. According to the invention, by reasonably controlling the chemical components, the martensitic stainless steel has high room-temperature strength and moderate-temperature strength, favorable toughness and excellent machining property.

Description

technical field [0001] The invention belongs to the field of stainless steel materials, and particularly relates to a martensitic stainless steel and a manufacturing method thereof. The martensitic stainless steel has high room temperature strength (yield strength greater than 450MPa at room temperature) and medium temperature strength (yield strength greater than 400MPa at 300°C) , good toughness (V-type impact energy greater than 50J at 0°C) and excellent machinability, especially suitable for the manufacture of support plates for nuclear power, hydropower and other equipment. Background technique [0002] With the development of green energy industries such as nuclear power and hydropower, the requirements for materials are getting higher and higher. In addition to high room temperature strength and good toughness, martensitic stainless steel used for support plates of nuclear power, hydropower and other equipment requires good medium temperature strength because the serv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/44C22C33/04C21D8/02C21D1/22
Inventor 余式昌
Owner 宝武特种冶金有限公司
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