Ultra-high-strength 9Ni steel for cryogenic environment and preparation process thereof

An ultra-high-strength, preparation technology, applied in temperature control and other directions, can solve the problems of material strength to be improved, high heat treatment temperature, increased energy consumption and production cost, etc., to increase hull transportation capacity, improve welding performance, and reduce hull. The effect of self-weight

Active Publication Date: 2010-10-20
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its disadvantages are: the heat treatment temperature (880°C) in the single-phase region is relatively high, which increases energy consumption and production costs; the strength of the material needs to be improved

Method used

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  • Ultra-high-strength 9Ni steel for cryogenic environment and preparation process thereof
  • Ultra-high-strength 9Ni steel for cryogenic environment and preparation process thereof
  • Ultra-high-strength 9Ni steel for cryogenic environment and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The ultra-high-strength 9Ni steel used in cryogenic environments contains (wt%): C 0.09%, Si0.07%, Mn 0.34%, P 0.007%, S 0.004%, Ni 9.16%, Cu 1.25%, Al 0.025%, the balance is Fe and unavoidable impurity elements.

[0050] The preparation process of the ultra-high-strength 9Ni steel applied to the cryogenic environment is as follows:

[0051] Prepare smelting raw materials according to the chemical composition of the above-mentioned ultra-high-strength 9Ni steel used in cryogenic environments, and form slabs with a thickness of 110 mm after smelting and casting the smelting raw materials;

[0052] Put the slab into the heating furnace to heat, the heating temperature is 1180°C, and keep it warm for 2 hours;

[0053] After the slab is released from the furnace, two-stage rolling is carried out. The rough rolling start temperature is 1000 ° C, the thickness of the waiting temperature is 61 mm, the finish rolling start temperature is 890 ° C, and the thickness of the rolle...

Embodiment 2

[0057] The chemical composition, rolling and cooling process of the ultra-high-strength 9Ni steel used in cryogenic environments are similar to those in Example 1, but the heat treatment process is quenched at 780°C for 1 hour, quenched at 635°C for 1 hour, and tempered at 570°C for heat preservation. 1h quenching (QLT635°C).

Embodiment 3

[0059] The chemical composition, rolling and cooling process of the ultra-high-strength 9Ni steel used in cryogenic environments are similar to those in Example 1, but the heat treatment process is quenched at 750°C for 1 hour, quenched at 670°C for 1 hour, and tempered at 570°C for 1 hour. (QLT670°C).

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Abstract

The invention relates to ultra-high-strength 9Ni steel for cryogenic environment and a preparation process thereof. The 9Ni steel comprises the following chemical components in percentage by weight: 0.01 to 0.2 percent of C, 0.05 to 0.35 percent of Si, 0.1 to 1.0 percent of Mn, less than or equal to 0.0070 of P, less than or equal to 0.0040 percent of S, 8.5 to 10.0 percent of Ni, 0.02 to 0.05 percent of Al, 0.0 to 2.0 percent of Cu and the balance of Fe and impurity elements. A cast blank with the same components as those of the 9Ni steel is subjected to heating, heat preservation, controlled rolling, controlled cooling and thermal processing to prepare the finished sheet material. The 9Ni steel has yield strength of over 710MPa, tensile strength of over 780MPa and impact power at the temperature of 196 DEG C below zero of over 120J, has a microstructure of martensite, ferrite and retained austenite and can effectively improve the comprehensive performance of LNG ships or LNG pipes.

Description

technical field [0001] The invention specifically relates to an ultra-high-strength 9Ni steel with excellent toughness in a cryogenic environment (below -196°C) and a preparation process thereof. Background technique [0002] With the development of my country's industrialization, my country has become a country with a large demand for energy, and the demand for natural gas is the largest, probably because natural gas has lower CO2 compared with coal and oil. 2 It belongs to clean energy, and natural gas has huge reserves in nature and can be used continuously for a long time. Therefore, the proportion of natural gas in my country's energy supply continues to increase. At present, 13 LNG (storage liquefied natural gas) receiving stations have been built or are under construction in my country, and 3,336,405 tons of liquefied natural gas were imported in 2008. However, during the transportation and storage of natural gas, a large number of LNG ships and LNG pipelines are re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/16B21B37/74C21D1/18
Inventor 张怀征刘东升
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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