CN102011048B - Nickel-based low-temperature pressure vessel steel and manufacturing method thereof - Google Patents

Nickel-based low-temperature pressure vessel steel and manufacturing method thereof Download PDF

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Publication number
CN102011048B
CN102011048B CN2010105016116A CN201010501611A CN102011048B CN 102011048 B CN102011048 B CN 102011048B CN 2010105016116 A CN2010105016116 A CN 2010105016116A CN 201010501611 A CN201010501611 A CN 201010501611A CN 102011048 B CN102011048 B CN 102011048B
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steel
low
nickel
temperature
minutes
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CN102011048A (en
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孟传峰
崔天燮
刘东风
王彩焕
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Shanxi Taigang Stainless Steel Co Ltd
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Shanxi Taigang Stainless Steel Co Ltd
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Abstract

The invention relates to a nickel-based low-temperature pressure vessel steel and a manufacturing method thereof. The pressure vessel steel comprises the following components in percentage by mass: 0.02-0.05% of C, 0.20-0.50% of Si, 0.40-0.80% of Mn, at most 0.003% of P, at most 0.003% of S, 8.5-9.0% of Ni, and balance of Fe and inevitable impurities. The manufacturing method comprises the following steps of: I. vacuum smelting and casting: adding pure iron and 9% of Ni blank into a vacuum induction furnace, smelting, and casting into bar-shaped blanks; II. forging: heating the bar-shaped blanks and forging into sheets; and III. heat treatment of steel sheets: keeping the temperature at 800-830 DEG C for 60-90 minutes, discharging, quenching, and tempering by keeping the steel sheets at 500-600 DEG C for 55-65 minutes; or keeping the iron sheets at 800-830 DEG C for 60-90 minutes, discharging, quenching, keeping the temperature at 670+/-20 DEG C for 60-90 minutes, discharging, secondarily quenching, and tempering by keeping the temperature at 500-600 DEG C for 55-65 minutes. The nickel-based low-temperature pressure vessel steel manufactured by using the method has the advantage of low cost.

Description

A kind of nickel is steel for low-temperature pressure container and method of manufacture thereof
Technical field
The present invention relates to a kind of nickel is steel for low-temperature pressure container and method of manufacture thereof.
Background technology
The applicant is that domestic first hand volume shipment PetroChina Company Limited., Guangdong Jiu Feng LNG storage tank are to be that low-temperature pressure vessel steel is the enterprise of 9%Ni with nickel.Nickel is noble metal, and 9%Ni requirement nickel content is 9.2~9.6%, and only the cost of nickel is up to 11040~11520 yuan in the steel per ton, and cost is higher, and how producing the low nickel of cost is steel for low-temperature pressure container, becomes the important topic of steel mill.
Summary of the invention
In order to overcome existing nickel is the above-mentioned deficiency of steel for low-temperature pressure container and method of manufacture thereof; It is steel for low-temperature pressure container and method of manufacture thereof that the present invention provides the low nickel of a kind of cost; The nickel of manufacturing of the present invention is steel for low-temperature pressure container, and performance index reach the 9%Ni standard-required.
Technical scheme of the present invention is the chemical ingredients that changes steel, reduces the content of nickel.Every saving 0.1% nickel content, steel per ton can reduce cost about 120 yuan.As being reduced to 8.5% by present 9.3%, steel per ton can reduce by 1000 yuan.This nickel-saving type nickel is the method for manufacture of Cryogenic Steel, under the prerequisite of ensuring the quality of products, reduces manufacturing cost significantly.
C: be the element that adds for proof strength, content 0.02% following effect is low, surpasses 0.08% and can cause low-temperature flexibility and weldableness to degenerate, so C content is decided to be 0.02~0.08%.The present invention is designed to C:0.02~0.05%, and purpose is to improve low-temperature impact toughness and welding property, and intensity improves through thermal treatment.
Si: be as deoxidant element and guarantee that intensity is needed, content 0.02% following effect is low, surpass 0.05% then toughness worsen, therefore be decided to be 0.02~0.50%.
Mn: as the element that improves intensity, content is low in 0.4% following effect, surpass 0.8% then toughness deterioration, so Mn content fixes on 0.40~0.80%.
P and S are to the deleterious element of toughness, and in order to obtain high-caliber toughness, P content surpasses .003%, and S content surpasses 0.002%, then do not carry out special thermal treatment and just can not get sufficient toughness, so P≤0.003%, S≤0.003%th, obligato.The 9%Ni steel also has certain temper brittleness susceptibility, and along with the increase of phosphorus content remarkable increase is arranged.Therefore, must strict control phosphorus content.Equally, also must strictly control sulphur content, because after the sulphur content increase, the thermal crack susceptibility when increasing the welding of 9%Ni steel.
Ni: improve intensity and flexible element simultaneously; Performance in order to ensure Cryogenic Steel is indispensable; Content does not reach 8.5% and can not get full intensity and toughness, surpass the 9.5% not only saturated but also production cost increasing of effect of toughness raising, so Ni content fixes on 8.5-9.0%.
This nickel is that the quality per distribution ratio of the composition of steel for low-temperature pressure container is:
C:0.02~0.05%, Si:0.20~0.50% ?Mn:.40~0.80% ?P≤0.003%
S≤0.003% Ni:8.5~9.0%
All the other are Fe and unavoidable impurities.
It is through the steel of pouring into a mould, cross forges into sheet material and thermal treatment is processed, and through mechanical properties test, Rel/Mpa, Rm/Mpa, A/% and Akv/J all reach the standard-required of 9%Ni steel.
This nickel is that the method for manufacture of steel for low-temperature pressure container comprises following sequential steps:
I vacuum metling and cast
The pure iron of purity 99.99% and 9%Ni blank be added in the vacuum induction furnace smelt, the proportion by weight of pure iron and blank is:
Pure iron 8 blank 88-92.
Best proportioning is:
Pure iron 10 blanks 90.
Tapping when the quality per distribution ratio of the composition of molten steel and temperature reach following the requirement
C:0.02~0.05%, Si:0.20~0.50%; Mn:0.40~0.80%;
P≤0.003%;S≤0.003%;Ni:8.5~9.0%。
All the other are Fe and unavoidable impurities.1550 ℃ of temperature.
Cast (sand mo(u)ld) becomes diameter 150-180mm, the clavate blank of long 80-100cm.
II is forged
With clavate blank heating to 1100~1200 ℃, be incubated 2~3 hours, be swaged into the sheet material of 20 ± 3mm.
III thermal treatment
Steel plate is incubated 60~90 minutes at 800~830 ℃, the quenching (shrend) of coming out of the stove then, the steel plate after will quenching at last is added in 500~600 ℃ of insulations tempering in 55-65 minute; Or with steel plate 800~830 ℃ of insulations 60~90 minutes, quenchings (shrend) of coming out of the stove then, 670 ℃ ± 20 ℃ insulations 60~90 minutes, the back secondary quenching of coming out of the stove was incubated tempering in 55-65 minute at 500~600 ℃ at last.
The IV mechanical properties test
Steel plate after the thermal treatment is cut sample carry out mechanical property, low-temperature impact work check, the tensile strength Rm of steel reaches 685~750Mpa, and impact value AKv reaches 180~240J, all satisfies the standard-required of 9%Ni.
This nickel is steel for low-temperature pressure container and method of manufacture thereof, because low than the 9%Ni steel with nickel, having reduced nickel is the cost of steel for low-temperature pressure container, and the tensile strength Rm of steel power and impact value AKv all reach the standard-required of 9%Ni steel.
Embodiment
Specify the embodiment that this nickel is steel for low-temperature pressure container and method of manufacture thereof below in conjunction with embodiment, be not limited to following embodiment but this nickel is the embodiment of steel for low-temperature pressure container and method of manufacture thereof.
Method of manufacture embodiment one
The present embodiment making method is a following sequential steps:
I vacuum metling and cast
The pure iron 10Kg of purity 99.99% and 9%Ni blank 90Kg be added in the vacuum induction furnace smelt tapping when the mass percent of the composition of molten steel and temperature reach following the requirement
C:0.02%; Si:0.02%; Mn:0.30% P:0.0036%;
S:0.001% Ni:8.4%
All the other are Fe and unavoidable impurities.1550 ℃ of temperature.
Cast (punching block) becomes diameter 160mm, the clavate blank of long 100cm.
II is forged
With clavate blank heating to 1160 ℃, be incubated 2.5 hours, adopt the cross forging method, be swaged into 20 * 80 * 1200mm sheet material, 860 ℃ of final forging temperatures are forged the back slow cooling to room temperature.
III thermal treatment
Sheet material is incubated 70 minutes at 800 ℃, the quenching (shrend) of coming out of the stove then, and the steel plate after will quenching at last is added in 560 ℃ of insulations tempering in 60 minutes.
The IV mechanical properties test
Heat-treated steel plate is cut sample carry out mechanical property, low-temperature impact work check, its mechanical property is seen table 1;
Table 1
Interventions Requested Rel/Mpa Rm/Mpa A/% Akv/J
Technical parameter 615~655 685~740 20~23 ?200~240
Method of manufacture embodiment two
The present embodiment method of manufacture is a following sequential steps:
I vacuum metling and cast
The pure iron 10Kg of purity 99.99% and 9%Ni blank 90Kg be added in the vacuum induction furnace smelt,
The tapping when mass percent of the composition of molten steel and temperature reach following the requirement
C:0.03%; Si:0.04%; Mn:0.50% P:0.0036%;
S:0.001% Nj:8.6%
Cast (punching block) becomes diameter 160mm, the clavate blank of long 100cm.
II is forged
With clavate blank heating to 1150 ℃, be incubated 3 hours, adopt the cross forging method, be swaged into 20 * 80 * 1200mm sheet material, 860 ℃ of final forging temperatures are forged the back slow cooling to room temperature.
III thermal treatment
Sheet material is incubated 80 minutes at 800 ℃, the quenching of coming out of the stove then, and 680 ℃ are incubated 80 minutes again, and the back secondary quenching of coming out of the stove is at last in 580 ℃ of insulations tempering in 60 minutes.
The IV mechanical properties test
Cut sample from heat-treated steel plate and carry out mechanical property, low-temperature impact work check, its mechanical property and 9%Ni standard-required are seen table 2;
Table 2
Interventions Requested Rel/Mpa Rm/Mpa A/% Akv/J
Technical parameter 590~620 700~750 20~24 180~220
The 9%Ni standard-required ≥585 680-820 ≥18 ≥100
Find out that from table 1 and 2 nickel of system of the present invention is the standard-required that the mechanical property of steel for low-temperature pressure container all reaches the 9%Ni steel.
Steel for low-temperature pressure container embodiment one
The steel for low-temperature pressure container of present embodiment making method embodiment one system, the mass percent of its composition is:
C:0.02%; Si:0.02%; Mn:0.30% ?P:0.0036%;
S:0.001% Ni:8.4%
All the other are Fe and unavoidable impurities.It is through the steel of pouring into a mould, cross forges into sheet material and thermal treatment is processed, and through mechanical properties test, Rel/Mpa, Rm/Mpa, A/% and Akv/J all reach the standard-required of 9%Ni steel.
Steel for low-temperature pressure container embodiment two
The steel for low-temperature pressure container of present embodiment making method embodiment two systems, the mass percent of its composition is:
C:0.03%; Si:0.04%; Mn:0.50% P:0.0036%;
S:0.001% Ni:8.6%。
All the other are Fe and unavoidable impurities.It is through the steel of pouring into a mould, cross forges into sheet material and thermal treatment is processed, and through mechanical properties test, Rel/Mpa, Rm/Mpa, A/% and Akv/J all reach the standard-required of 9%Ni steel.Mechanical property all reaches the standard-required of 9%Ni steel.

Claims (2)

1. method of manufacture that nickel is steel for low-temperature pressure container, it comprises following sequential steps:
I vacuum metling and cast
The pure iron of purity 99.99% and 9%Ni blank be added in the vacuum induction furnace smelt, the proportion by weight of pure iron and blank is:
Pure iron 8 blank 88-92;
Tapping when the quality per distribution ratio of the composition of molten steel and temperature reach following the requirement
C:0.02~0.05%,Si:0.20~0.50%;Mn:0.40~0.80%;P≤0.003%;S≤0.003%;Ni:8.5~9.0%
All the other are Fe and unavoidable impurities; 1550 ℃ of temperature;
Pour into diameter 150-180mm, the clavate blank of long 80-100cm;
II forges
With clavate blank heating to 1100~1200 ℃, be incubated 2~3 hours, adopt the cross forging method, be swaged into the sheet material of 20 ± 3mm;
III thermal treatment
Steel plate is incubated 60~90 minutes at 800~830 ℃, the quenching of coming out of the stove then, the steel plate after will quenching at last is added in 500~600 ℃ of insulations tempering in 55-65 minute; Or with steel plate 800~830 ℃ of insulations 60~90 minutes, quenchings of coming out of the stove then, 670 ℃ ± 20 ℃ insulations 60~90 minutes, the back secondary quenching of coming out of the stove was incubated tempering in 55-65 minute at 500~600 ℃ at last.
2. nickel according to claim 1 is the method for manufacture of steel for low-temperature pressure container, it is characterized in that: the proportion by weight of pure iron and blank is:
Pure iron 8 blanks 90.
CN2010105016116A 2010-09-29 2010-09-29 Nickel-based low-temperature pressure vessel steel and manufacturing method thereof Active CN102011048B (en)

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Publication number Priority date Publication date Assignee Title
CN102409254B (en) * 2011-11-25 2013-05-22 山西太钢不锈钢股份有限公司 Heat treatment method of steel plate for pressure container
CN102766802A (en) * 2012-08-06 2012-11-07 山西太钢不锈钢股份有限公司 Low-temperature high-nickel steel plate and production method thereof
CN104388838B (en) * 2014-10-31 2017-06-30 舞阳钢铁有限责任公司 Ultralow temperature pressure vessel 5Ni steel plates and its production method
CN105349886B (en) * 2015-12-03 2017-08-29 攀钢集团成都钢钒有限公司 195 DEG C of used at ultra-low temperature seamless steel pipes and preparation method thereof
CN107828945B (en) * 2016-09-14 2019-06-11 沈阳透平机械股份有限公司 Material and its surface reinforcing method for piston rod in ultralow temperature reciprocating compressor

Citations (3)

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Publication number Priority date Publication date Assignee Title
CN101054647A (en) * 2007-05-26 2007-10-17 山西太钢不锈钢股份有限公司 Method of producing low-temperature high-toughness steel and steel plate
CN101235466A (en) * 2008-02-28 2008-08-06 武汉钢铁(集团)公司 High ductility negative 110 degree low-temperature steel and manufacturing method thereof
CN101693980A (en) * 2009-09-30 2010-04-14 山西太钢不锈钢股份有限公司 Flat steel and manufacture method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101054647A (en) * 2007-05-26 2007-10-17 山西太钢不锈钢股份有限公司 Method of producing low-temperature high-toughness steel and steel plate
CN101235466A (en) * 2008-02-28 2008-08-06 武汉钢铁(集团)公司 High ductility negative 110 degree low-temperature steel and manufacturing method thereof
CN101693980A (en) * 2009-09-30 2010-04-14 山西太钢不锈钢股份有限公司 Flat steel and manufacture method thereof

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