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Super-martensitic stainless steel and preparation method thereof

A technology of martensitic stainless steel and stainless steel, applied in the field of iron and steel materials, can solve the problems of damage to ductility, easy coarsening, and no consideration of the ratio of nitrogen and microalloying elements, etc., to improve pitting resistance, increase strength, Effect of good localized corrosion resistance

Inactive Publication Date: 2012-07-04
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high nitrogen content often leads to the appearance of coarse microalloying element carbonitrides. At the same time, due to the low thermodynamic stability of microalloying element V carbonitrides, it is easy to coarsen during heat treatment, which not only cannot effectively improve stainless steel. In addition, these designs do not consider the ratio between nitrogen and microalloying elements, and the added microalloying elements cannot completely inhibit the precipitation of Cr nitrides during heat treatment, so they cannot effectively improve stainless steel. Corrosion resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The chemical composition obtained by melting in a vacuum induction furnace is C: 0.008%, N: 0.009%, S: 0.007%, P: 0.010%, Si: 0.39%, Mn: 0.63%, Cr: 13.35%, Ni: 4.35%, Mo : 1.08%, Nb: 0.11%, Ti: 0.008%, Fe balance super martensitic stainless steel billet. After hot forging at 1200°C, and then hot rolling at 1200°C. In the heat treatment furnace, the hot-rolled super martensitic stainless steel plate is subjected to solution treatment. The solution treatment temperature is 1100°C, and the treatment time is 0.5h. After tempering at 550°C for 2 hours in an electric resistance furnace, the yield strength at room temperature is 920 MPa, the tensile strength is 1030 MPa, the elongation is 17.22%, and the Charpy V-shaped notch impact absorption energy is 145J. The pitting potential is 125mV; after tempering at 700°C for 2h oil cooling, the yield strength at room temperature is 700MPa, the tensile strength is 900MPa, the elongation is 17.44%, and the Charpy V-notch impact absor...

Embodiment 2

[0015] The chemical composition obtained by melting in a vacuum induction furnace is C: 0.016%, N: 0.025%, S: 0.012%, P: 0.009%, Si: 0.34%, Mn: 0.78%, Cr: 14.86%, Ni: 5.35%, Mo : 1.55%, Nb: 0.080%, Ti: 0.0065%, super martensitic stainless steel slab with Fe balance. After hot forging at 1200°C, hot rolling at 1150°C. In the heat treatment furnace, the hot-rolled super martensitic stainless steel plate is subjected to solution treatment. The solution treatment temperature is 1050°C, and the treatment time is 0.8h. After tempering in a box-type resistance furnace at 550°C for 4 hours and oil cooling, the yield strength at room temperature is 940 MPa, the tensile strength is 1040 MPa, the elongation is 18.62%, and the Charpy V-shaped notch impact absorption energy is 150J. The pitting potential in salt water is 190mV; after tempering at 700°C for 2h oil cooling, the yield strength at room temperature is 720MPa, the tensile strength is 920MPa, the elongation is 17.11%, and the Ch...

Embodiment 3

[0017] The chemical composition obtained by melting in a vacuum induction furnace is C 0.028%, N: 0.015%, S: 0.004%, P: 0.018%, Si: 0.68%, Mn: 0.48%, Cr: 12.91%, Ni: 5.65%, Mo: 2.05%, Nb: 0.075%, Ti: 0.0043%, Fe balance super martensitic stainless steel slab. After hot forging at 1200°C, hot rolling at 1100°C. In the heat treatment furnace, the hot-rolled super martensitic stainless steel plate is subjected to solution treatment. The solution treatment temperature is 1050°C, and the treatment time is 1h. After tempering in a resistance furnace at 575°C for 2 hours with oil cooling, the yield strength at room temperature is 980 MPa, the tensile strength is 1030 MPa, the elongation is 19.65%, and the Charpy V-shaped notch impact absorption energy is 165J. The pitting potential is 240mV; after tempering at 650℃ for 2h oil cooling, the yield strength at room temperature is 720MPa, the tensile strength is 950MPa, the elongation is 21.05%, and the Charpy V-notch impact absorption e...

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Abstract

The invention relates to super-martensitic stainless steel and a preparation method thereof, and belongs to the field of steel materials. The super-martensitic stainless steel comprises the following chemical components in percentage by mass: 0 to 0.03 percent of C, 0 to 0.03 percent of N, less than 0.015 percent of S, less than 0.020 percent of P, less than 1 percent of Si, less than 1 percent of Mn, 13 to 16 percent of Cr, 4 to 6 percent of Ni, 1 to 2 percent of Mo, 0.05 to 0.15 percent of Nb, 0.001 to 0.01 percent of Ti and the balance of Fe. The preparation method comprises the following steps of: smelting by using a vacuum induction furnace to obtain a casting blank which meets the requirements of chemical component ranges, performing hot forging at the temperature of 1,200 DEG C, performing hot rolling at the temperature of between 1,100 and 1,200 DEG C, performing solid solution treatment at the temperature of between 1,050 and 1,100 DEG C for 0.5 to 1 hour, performing air cooling and normalizing treatment, tempering at the temperature of between 550 and 700 DEG C for 2 to 4 hours, and performing oil cooling to room temperature. The super-martensitic stainless steel has high strength and toughness and high local corrosion resistance.

Description

technical field [0001] The invention belongs to the field of iron and steel materials, and in particular relates to a super martensitic stainless steel and a preparation method thereof. Background technique [0002] Super martensitic stainless steel is an ultra-low carbon soft martensitic stainless steel developed on the basis of traditional martensitic stainless steels such as 1Cr13 and 2Cr13 by reducing carbon content and increasing nickel and molybdenum content. This type of stainless steel has good hardenability, excellent room temperature and low temperature mechanical properties, corrosion fatigue strength and dynamic and static fracture toughness, good cold and hot process performance such as casting, forging, welding and machining, and is widely used in nuclear power engineering construction, Construction of large water turbines and high-pressure water pumps, oil extraction and other energy fields. The good performance of this type of steel is not only due to its im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50C21D8/02C21D1/22
Inventor 马小平王立军刘春明
Owner NORTHEASTERN UNIV
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