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Heat treatment method for high-strength high-hardness marine-corrosion-resistant non-magnetic steel

A heat treatment method and non-magnetic steel technology, applied in the field of alloy material preparation, can solve the problems of insufficient corrosion resistance, insufficient strength and wear resistance, affecting the service life of the drum, etc.

Inactive Publication Date: 2014-02-26
LESHAN LIDUN CAST STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the strength and wear resistance of this material cannot meet the requirements during use, especially when working in a marine environment, its corrosion resistance is significantly insufficient, which not only affects the appearance quality of the drum, but also greatly affects the quality of the drum. service life, leading to an increase in the replacement frequency of logging truck drums

Method used

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  • Heat treatment method for high-strength high-hardness marine-corrosion-resistant non-magnetic steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] 1. Processing of anti-corrosion and anti-magnetic steel: Add steel scrap and pig iron into the melting furnace to heat up and melt. The melting furnace should be an intermediate frequency induction furnace. The melting temperature is generally around 1450°C-1550°C. Add nickel plate, ferromanganese, ferrochromium, ferromolybdenum, ferrovanadium and ferroniobium in sequence, and the diameter of the material block is preferably 50-80mm. The mass percentages of the above chemical components are controlled as follows: C: 0.30%, Si: 0.80%, Mn: 0.85%, Cr: 18.00%, Ni: 12.00%, Mo: 2.00%, V: 0.50%, Nb: 0.15%. After melting, when the furnace temperature reaches 1550-1580°C, deoxidation, dehydrogenation and denitrification are required. The deoxidizer is made of aluminum wire, Si-Ca alloy or SiC, and the deoxidizer is pressed into the depth of the furnace, and then ferrotitanium ( The diameter is preferably 3-5mm), Ti: 0.15%. At this time, the metal liquid surface is covered with a...

Embodiment 2

[0085] 1. Processing of anti-corrosion and anti-magnetic steel: Add steel scrap and pig iron into the melting furnace to heat up and melt. The melting furnace should be an intermediate frequency induction furnace. The melting temperature is generally around 1450°C-1550°C. Add nickel plate, ferromanganese, ferrochromium, ferromolybdenum, ferrovanadium and ferroniobium in sequence, and the diameter of the material block is preferably 50-80mm. The mass percentages of the above chemical components are controlled as follows: C: 0.28%, Si: 0.83%, Mn: 1.20%, Cr: 18.8%, Ni: 11.5%, Mo: 2.25%, V: 0.53%, Nb: 0.13%. After melting, when the furnace temperature reaches 1550-1580°C, deoxidation, dehydrogenation and denitrification are required. The deoxidizer is made of aluminum wire, Si-Ca alloy or SiC, and the deoxidizer is pressed into the depth of the furnace, and then ferrotitanium ( The diameter is preferably 3-5mm) Ti: 0.14%, the metal liquid surface is covered with a covering agent a...

Embodiment 3

[0090] 1. Processing of anti-corrosion and anti-magnetic steel: Add steel scrap and pig iron into the melting furnace to heat up and melt. The melting furnace should be an intermediate frequency induction furnace. The melting temperature is generally around 1450°C-1550°C. Add nickel plate, ferromanganese, ferrochromium, ferromolybdenum, ferrovanadium and ferroniobium in sequence, and the diameter of the material block is preferably 50-80mm. The mass percentages of the above chemical components are controlled as follows: C: 0.34%, Si: 0.90%, Mn: 1.45%, Cr: 17.4%, Ni: 12.8%, Mo: 2.45%, V: 0.48%, Nb: 0.12%. After melting, when the furnace temperature reaches 1550-1580°C, deoxidation, dehydrogenation, and denitrification are required. The deoxidizer is made of aluminum wire, Si-Ca alloy or SiC, and the deoxidizer is pressed into the depth of the furnace, and then ferrotitanium ( The diameter is preferably 3-5mm) Ti: 0.17%, the metal liquid surface is covered tightly with a coverin...

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Abstract

The invention discloses a heat treatment method for high-strength high-hardness marine-corrosion-resistant non-magnetic steel, belonging to the field of alloy materials. The heat treatment method comprises the following steps: (1) feeding smelted corrosion-resistant antimagnetic steel of which the temperature is no more than 500 DEG C into a heat treatment furnace; (2) heating to 600-650 DEG C at a heating rate of 80-100 DEG C / h, and keeping the constant temperature for 2-3 hours; and (3) heating to 1050-1080 DEG C at a heating rate of 80-100 DEG C / h, and keeping the constant temperature for 5-6 hours; and performing solution treatment, performing welding combination, machining, and performing stabilizing heat treatment, wherein the treatment process is specifically as follows: (1) heating to 600-630 DEG C at a heating rate of 100-120 DEG C / h, and keeping the constant temperature for 2-3 hours; and (2) heating to 820-850 DEG C at a heating rate of 100-120 DEG C / h, keeping the constant temperature for 6-8 hours, and cooling to room temperature in the furnace, thus finishing the process. The heat treatment method disclosed by the invention is used for new non-magnetic steel which is non-magnetic and resistant to marine corrosion and has high strength and hardness.

Description

technical field [0001] The invention belongs to the field of alloy material preparation, and in particular relates to materials for offshore oil exploration, in particular to the preparation of marine corrosion-resistant and anti-magnetic steel for offshore oil exploration drilling vehicle drums. Background technique [0002] At present, the rollers of oil industry logging trucks, logging skids and other equipment at home and abroad are all made of ZG3Mn19Cr4 non-magnetic steel. The smelting and processing technology of non-magnetic steel is very mature in China. However, the strength and wear resistance of this material cannot meet the requirements during use, especially when working in a marine environment, its corrosion resistance is significantly insufficient, which not only affects the appearance quality of the drum, but also greatly affects the quality of the drum. service life, leading to an increase in the replacement frequency of logging truck drums. Contents of t...

Claims

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Application Information

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IPC IPC(8): C21D6/00C21D8/00C22C38/50
Inventor 马玉川
Owner LESHAN LIDUN CAST STEEL
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