Preparation method for high-toughness 3.5Ni steel plate

A high-toughness, steel plate technology, applied in the field of alloy steel manufacturing, can solve the problem of high impact test temperature, achieve the effect of improving low-temperature toughness and strength, reducing production costs, and reducing costs

Active Publication Date: 2015-12-23
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of these patents use NT or QT two-stage heat treatment, and the impact test temperature is higher than -110°C, and there is no mention of impact tests at -120°C or below

Method used

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  • Preparation method for high-toughness 3.5Ni steel plate
  • Preparation method for high-toughness 3.5Ni steel plate
  • Preparation method for high-toughness 3.5Ni steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The composition of 3.5Ni steel by weight percentage is: C0.065%, Si0.21%, Mn0.62%, S0.002%, P0.005%, Ni3.72%, Al0.031%, and the balance is Fe and impurities;

[0026] The steps of the steel preparation method include steelmaking, billet opening, two-stage controlled rolling, and on-line heat treatment, specifically:

[0027] Use a 50Kg vacuum induction furnace to make steel. After the pouring is completed, the ingot is kept in a heating furnace at a temperature of 1200°C for 1 hour, and then hot-rolled to form a 100mm thick billet. The billet is placed in the heating furnace and heated to 1200°C. keep warm for 2 hours;

[0028] The rolling is controlled in two stages, and a total of seven rolling passes have been passed, of which the first four passes are rough rolling, and the last three passes are finish rolling; the rough rolling is rolled in the austenite complete recrystallization zone, and the rolling temperature is 1100°C , the finishing temperature of rough ro...

Embodiment 2

[0039] The composition of 3.5Ni steel is designed by weight percentage: C0.055%, Si0.17%, Mn0.68%, S0.002%, P0.005%, Ni3.46%, Al0.023%, the balance For Fe and impurities;

[0040] The steps of the steel preparation method include steelmaking, billet opening, two-stage controlled rolling, and on-line heat treatment, specifically:

[0041] Use a 50Kg vacuum induction furnace to make steel. After the pouring is completed, the ingot is kept in a heating furnace at a temperature of 1150°C for 2 hours, and then hot-rolled to form a 100mm thick billet. Put the billet into the heating furnace and heat it to 1150°C. keep warm for 2 hours;

[0042] The rolling is controlled in two stages, and a total of six rolling passes have been passed, of which the first three passes are rough rolling, and the last three passes are finish rolling; the rough rolling is rolled in the austenite complete recrystallization zone, and the rolling temperature is 1120°C , the finishing temperature of rough...

Embodiment 3

[0046] The composition of 3.5Ni steel by weight percentage is: C0.043%, Si0.13%, Mn0.86%, S0.004%, P0.007%, Ni3.3%, Cr0.59%, Mo0.037% , Al0.039%, the balance is Fe and impurities;

[0047] The steps of the steel preparation method include steelmaking, billet opening, two-stage controlled rolling, and on-line heat treatment, specifically:

[0048] Use a 50Kg vacuum induction furnace to make steel. After the pouring is completed, the ingot is kept in a heating furnace at a temperature of 1150°C for 2 hours, and then hot-rolled to form a 100mm thick billet. Put the billet into the heating furnace and heat it to 1150°C. keep warm for 2 hours;

[0049] The rolling is controlled in two stages, and a total of seven rolling passes have been passed, of which the first four passes are rough rolling, and the last three passes are finish rolling; the rough rolling is rolled in the austenite complete recrystallization zone, and the rolling temperature is 1120°C , the rough rolling end te...

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Abstract

The invention provides a preparation method for a high-toughness 3.5Ni steel plate in order to reduce the production cost and belongs to the field of alloy steel manufacture. The preparation method comprises the steps that (1) hot rolling is conducted, a casting blank is put into a heating furnace with the temperature of 1150 DEG C-1200 DEG C for heat preservation for 1-2 h, the casting blank comprises, by weight, 0.04%-0.07% of C, 0.10%-0.25% of Si, 0.60%-0.90% of Mn, 0-0.005% of S, 0-0.008% of P, 0 or 3.3%-3.8% of Ni, 0-0.60% of Cr, 0-0.04% of Mo, 0.02%-0.05% of Alt and the balance Fe and impurities; two-stage rolling is adopted for hot rolling, and the total compression ratio of the steel plate is the thickness of the casting blank/the thickness of a finished product>=5.00; and (2) direct hot rolling is conducted, the rolled steel plate is quenched directly or after the relaxation for 10-20 s to below 300 DEG C through ultra fast cooling at the speed of larger than or equal to 20 DEG C/s, then the plate is put into a heating furnace with the temperature of 570 DEG C-620 DEG C for heat preservation, after that, the product is obtained after the steel plate is cooled through water or air to the room temperature. According to the preparation method, direct quenching and tempering processes are adopted, so that the process flow of hot treatment is shortened, and the cost is lowered; in addition, the austenite grain size is refined by controlling the rolling process, and the low-temperature toughness and other mechanical properties of 3.5Ni steel are significantly improved.

Description

technical field [0001] The invention belongs to the field of alloy steel manufacture, and in particular relates to a preparation method of a high-toughness 3.5Ni steel plate. Background technique [0002] In recent years, with the rapid development of my country's national economy, the petrochemical industry and its related industries have flourished. At the same time, petroleum, chemical and other energy industries require a large amount of low-temperature steel to manufacture various liquefied petroleum gas (LPG), liquefied ethylene (LNG) production and storage equipment. One of the goals of my country's "Twelfth Five-Year Plan" is to optimize the development of petrochemical energy and accelerate the development of oil and gas resources. This will provide a broad market and development opportunities for the energy production and storage equipment manufacturing industry under low temperature service conditions, and Tongjin will also promote the development of low temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/44C22C38/40C22C38/12C22C38/08C21D8/02
Inventor 刘振宇王猛李成刚王国栋
Owner NORTHEASTERN UNIV
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