Low-temperature flexibility 1.5Ni steel and method of manufacturing the same

A technology of low temperature toughness and manufacturing method, applied in the field of Ni steel, can solve the problems of difficult heating and rolling process, increased cost, etc.

Active Publication Date: 2009-08-05
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a low-temperature steel, a very important technical indicator is low-temperature impact toughness. The alloy element Ni is added to the steel and dissolved in ferrite to significantly improve the low-temperature toughness of the matrix. However, Ni is

Method used

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  • Low-temperature flexibility 1.5Ni steel and method of manufacturing the same
  • Low-temperature flexibility 1.5Ni steel and method of manufacturing the same
  • Low-temperature flexibility 1.5Ni steel and method of manufacturing the same

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Experimental program
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Effect test

Embodiment 1-5

[0037] Table 2 is the chemical composition of embodiment 1-5

[0038] Table 2

[0039]

[0040] According to hot rolling and heat treatment process, embodiment 1-5 rolling (finished steel thickness 20mm) and heat treatment process parameter range are as follows:

[0041] Slab heating temperature: 1150~1250℃; recrystallization controlled rolling temperature: 950~1100℃, accumulative reduction rate≥50%; non-recrystallized controlled rolling temperature: 870~920℃, accumulative reduction rate≥20% ; Two-phase zone controlled rolling temperature: 800-850°C, cumulative reduction rate ≤10%; termination cooling temperature: ≤300°C; quenching temperature: 850-950°C; tempering temperature: 600-660°C.

[0042] The holding time of each stage is calculated according to the plate thickness according to 1 ~ 3.5min / mm.

[0043] Table 3 embodiment 1-5 concrete process parameter

[0044] table 3

[0045]

[0046] Such as figure 1 As shown, the embodiment passes through the metallograph...

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Abstract

The invention discloses low-temperature ductility 1.5Ni steel and a manufacturing method thereof, wherein the low-temperature ductility 1.5Ni steel comprises the chemical components according to percentages by weight of 0.02-0.10 percent of C, 0.22-0.30 percent of Si, 1.00-1.50 percent of Mn, less than or equal to 0.08 percent of V, 1.20-1.60 percent of Ni, less than or equal to 0.005 percent of S, less than or equal to 0.010 percent of P, less than or equal to 0.03 percent of Nb, less than or equal to 0.04 percent of Ti, less than or equal to 0.04 percent of Al, 0.002-0.005 percent of N and the rest of Fe and unavoidable impurities. The manufacturing method comprises the following steps of smelting and casting into a casting blank, heating the casting blank, controlled rolling and heat treatment. In the invention, after the micro alloy steel finishes the controlled rolling, a high-strength low-temperature pressure vessel steel plate which has yield strength of more than 400MPa, tensile strength of more than 500MPa and satisfies the low-temperature impact ductility requirement of 100 DEG C below is produced through adopting a thermal refining method. The invention is suitable for manufacturing vessels, such as a low-temperature pressure vessel, a liquefied natural gas storage tank, a liquefied petroleum gas storage tank, a petrochemical storage tank, and the like.

Description

technical field [0001] The invention relates to a Ni steel, in particular to a low-temperature toughness 1.5Ni steel and a manufacturing method thereof. Background technique [0002] Low-temperature steel is mainly used to manufacture pressure vessels and storage tanks for storing and transporting various liquefied gases. Ni is an important element in the development of low-temperature steel. According to the different Ni content, different grades of low-temperature steel such as 1.5Ni, 3.5Ni, 5Ni, and 9Ni have been developed to suit different low-temperature environments and media. Among them, 1.5Ni steel is widely used Used in chemical and petrochemical fields—45℃~—80℃ low-temperature pressure vessel steel, such as ethylene equipment in chemical enterprises, low-temperature methanol washing equipment in urban coal pressurized gasification, etc., can also meet the requirements of LPG (liquefied petroleum gas) ) storage and transportation needs. As a low-temperature steel,...

Claims

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Application Information

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IPC IPC(8): C22C38/14C22C1/02B21B37/74C21D8/00
Inventor 杨才定张汉谦唐文军
Owner BAOSHAN IRON & STEEL CO LTD
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