CN106222554A - A kind of economical steel used at ultra-low temperature and preparation method thereof - Google Patents

A kind of economical steel used at ultra-low temperature and preparation method thereof Download PDF

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CN106222554A
CN106222554A CN201610709859.9A CN201610709859A CN106222554A CN 106222554 A CN106222554 A CN 106222554A CN 201610709859 A CN201610709859 A CN 201610709859A CN 106222554 A CN106222554 A CN 106222554A
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ultra
temperature
low temperature
steel used
rolling
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孙超
楚觉非
单以刚
李强
谢章龙
刘勇
赵荣贵
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Nanjing Iron and Steel Co Ltd
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Nanjing Iron and Steel Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/001—Austenite

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The present invention is a kind of economical steel used at ultra-low temperature, its mass percent chemical composition is: C:0.3 0.6%, Mn:20 28%, Si:0.1 0.5%, Cr:2.5 5.5%, Cu:0.3 0.8%, N:0.01 0.10%, Al:0.01 0.05%, P≤0.03%, S≤0.01%, surplus is Fe and inevitable impurity element.The economical steel used at ultra-low temperature of the present invention obtains Austenitic tissue by heating, roll and cool down technique, uses temperature can reach 196 DEG C.The economical steel used at ultra-low temperature of the present invention significantly improves plasticity compared with 9Ni steel, significantly improves intensity, and greatly reduce cost of alloy compared with austenitic stainless steel.

Description

A kind of economical steel used at ultra-low temperature and preparation method thereof
Technical field
The present invention relates to a kind of steel used at ultra-low temperature, especially relate to a kind of economical steel used at ultra-low temperature and preparation method thereof.
Background technology
Steel used at ultra-low temperature uses and has the steel of enough notch toughnesses in a low temperature of referring to below-196 DEG C, at present Wide variety of steel grade is mainly 9Ni steel and austenitic stainless steel.9Ni steel is greatly lowered tough-crisp turn by the Ni of high-load Temperature, obtains the heterogeneous structure of tempered martensite+rotary austenite by heat treatment, and tempered martensite matrix provides higher Intensity, and rotary austenite is as the absorber of deformation load, can hinder germinating and the extension of deformation crackle, thus improves low Temperature toughness.The austenitic stainless steels such as 304L and 316L contain substantial amounts of Cr, Ni and Mn, with stable austenite phase for matrix group Knit, without ductil-brittle transition phenomenon, excellent in low temperature toughness；But both steel used at ultra-low temperature are required for adding a large amount of expensive Ni element, Thus it is relatively costly.As patent CN104152797A discloses a kind of cold plasticity high manganese steel sheet and processing method, Mn content Higher, need to increase the operation such as solution treatment and tempering, and the condition of use is not up to-196 DEG C of ultra-low temperature surroundings.Additionally, 9Ni steel Although there is higher-strength but plasticity is the highest, although and austenitic stainless steel plasticity is the highest but intensity is the lowest, which limits two Plant the range of application of steel used at ultra-low temperature.
Summary of the invention
The technical problem to be solved is, how at the cost reducing steel used at ultra-low temperature so that it is at-196 DEG C There is excellent in toughness, and comprehensive mechanical property is better than 9Ni steel and austenitic stainless steel；In order to solve above technical problem, this A kind of economical steel used at ultra-low temperature of bright proposition and preparation method thereof, concrete technical scheme is:
A kind of economical steel used at ultra-low temperature, its mass percent chemical composition is: C:0.3-0.6%, Mn:20-28%, Si:0.1- 0.5%, Cr:2.5-5.5%, Cu:0.3-0.8%, N:0.01-0.10%, Al:0.01-0.05%, P≤0.03%, S≤0.01%, remaining Amount is Fe and inevitable impurity element.
The preparation method of above-mentioned economical steel used at ultra-low temperature, comprises the following steps:
(i) heating: will there is the heating of plate blank of chemical composition identical with described steel used at ultra-low temperature to 1080-1220 DEG C, and be incubated 90-180min；Under high temperature, the alloying element in austenite passes through diffusion way homogenization；
(ii) rolling: the slab after heating is rolled, pass deformation >=12%, total deformation >=85%, finishing temperature 970- 1030℃；Obtained the isometry austenite crystal of size uniform by recrystallization softening during rolling；
(iii) cooling: to rolling after steel plate online accelerate cooling, cooldown rate 5-30 DEG C/s, final cooling temperature be room temperature extremely 400 DEG C, after when final cooling temperature is higher than room temperature, acceleration cooling terminates, air cooling is to room temperature；Accelerate the crystal grain under cooling suppression high temperature long Greatly, avoid the formation of the precipitated phase of infringement low-temperature flexibility simultaneously.
In the present invention, the restriction reason of chemical composition content is as follows:
C can improve the stability of austenite phase, the formation of suppression ε-martensite, improves low-temperature flexibility, but too high C content makes Stacking fault energy significantly increases and hinders the formation of twin, damages plasticity；C content is controlled at 0.3-0.6% by the present invention.
Mn can produce solution strengthening, additionally it is possible to stable austenite phase, in order to obtain sufficiently stable austenite phase, and suppression The formation of ε-martensite, needs to add substantial amounts of Mn, and its addition belongs to " Gao Meng " scope for low-alloy steel, but Mn Too high levels the most easily produces intergranular flwrittle fracture, reduces low-temperature flexibility；Mn content is controlled at 20-28% by the present invention.
Si can produce solution strengthening, but Si can weaken crystal boundary at Grain Boundary Segregation and improve along brilliant fragility, and Si also can in addition Reduce plasticity；Si content is controlled at 0.1-0.5% by the present invention.
Cr can produce solution strengthening, moreover it is possible to strengthening austenite grain boundary, but Cr too high levels then can reduce formability；This Bright Cr content is controlled at 2.5-5.5%.
Cu can stable austenite phase, additionally it is possible to produce solution strengthening, but Cu too high levels can cause red brittleness, is unfavorable for Hot rolling；Cu content is controlled at 0.3-0.8% by the present invention.
N can produce solution strengthening, can significantly strengthen crystal boundary at Grain Boundary Segregation and suppress the brilliant fragility in low temperature edge, but N content Too high, easily form a large amount of nitride thus damage plasticity and weldability；N content is controlled at 0.01-0.10% by the present invention.
Al is deoxidant element in steelmaking process, also has the effect of strengthening austenite grain boundary, but excess adds easy shape Become large-sized Al3O2, AlN and other precipitated phase, damage low-temperature flexibility；Al content is controlled at 0.01-by the present invention 0.05%。
S can form MnS, S and P and also can weaken crystal boundary at Grain Boundary Segregation thus increase low temperature along brilliant fragility, needs to control Bottom line.
In preparation method of the present invention, process conditions restriction reason is as follows:
(1) during blank heating, the alloying element in austenite structure passes through diffusion way homogenization；When heating-up temperature is too high or is incubated Between long high temperature austenite crystal grain will be caused the thickest, and heating-up temperature is too low or temperature retention time is too short is unfavorable for alloying element Homogenization, therefore the present invention is by heating and temperature control at 1080-1220 DEG C, and temperature retention time controls at 90-180min；(2) heat Rear blank rolls, and is obtained the isometry austenite crystal of size uniform by recrystallization softening, and this just requires at austenite complete Full recrystallization zone rolls, and therefore rolling deformation temperature is controlled more than 970 DEG C by the present invention, and requires the road of more than 12% Secondary deflection and more than 85% total deformation to ensure enough grain refining effect；(3) after rolling, online acceleration is cooled to 400 Below DEG C, it is possible under suppression high temperature, crystal grain is grown up, it also is able to avoid the formation of the precipitated phase of infringement low-temperature flexibility simultaneously.
Austenite under design of alloy of the present invention has sufficiently high heat stability, and phase does not occur in cooling procedure Become, under room temperature, remain the austenite crystal that high temperature rolling obtains.In deformation process, there is not martensitic phase transformation in austenite, But generation deformation twin, make twin with sliding alternately, it is thus achieved that high work hardening capacity, twin boundary can also hinder simultaneously Cracks can spread, improves uniform elongation；This stable high manganese austenite remains able to be retained at-196 DEG C, passes through Add the alloying element of the strengthening crystal boundaries such as N, Al, Cr in right amount and reduce S, P and the harmful element of other reduction crystal boundary, it is suppressed that be low Temperature, along brilliant fragility, makes material possess superior low-temperature toughness.Additionally, high Mn content improves N solid solubility in steel, coordinate C, The solution strengthening effect of the elements such as Mn, Si, Cr, Cu, makes high manganese austenite tissue have the intensity higher than nickel chromium triangle austenite structure.
The technical scheme that the present invention limits further is:
Aforesaid economical steel used at ultra-low temperature, steel used at ultra-low temperature has austenite structure at normal temperatures.
Aforesaid economical steel used at ultra-low temperature, the thickness of the sheet material that steel used at ultra-low temperature is made is 12-50mm, it is stipulated that disproportional Extension strength Rp0.2>=400MPa, tensile strength Rm>=800MPa, elongation percentage A >=50% ,-196 DEG C of impact test impact absorbing energy Amount KV2≥80J。
The invention has the beneficial effects as follows:
The present invention by adding the higher manganese of content in steel, and be properly added other can the alloy unit of stable austenite phase Element, it is thus achieved that still there is at-196 DEG C the single austenite structure of sufficiently stable property, and designed by appropriate alloy, real Show enough solution strengthening, twin crystal inducing plasticity and suppression low temperature edge crystalline substance fragility, made high manganese austenite tissue obtain splendid Mould by force tough cooperation.The steel used at ultra-low temperature that the present invention proposes significantly improves plasticity, with austenitic stainless steel phase compared with 9Ni steel Ratio significantly improves intensity, and significantly reduces conjunction compared with the 9Ni steel that with the addition of a large amount of Ni element and austenitic stainless steel Gold cost, therefore range of application is wider, economic benefit is higher.
Accompanying drawing explanation
Fig. 1 is the optical microscopy map of economical steel used at ultra-low temperature metallographic structure in embodiment 1.
Fig. 2 is the optical microscopy map of economical steel used at ultra-low temperature metallographic structure in embodiment 2.
Fig. 3 is the optical microscopy map of economical steel used at ultra-low temperature metallographic structure in embodiment 3.
Detailed description of the invention
Embodiment 1
The present embodiment be a kind of thickness be the economical used at ultra-low temperature steel board of 25mm, chemical composition and mass fraction thereof be respectively 0.45%C, 24%Mn, 0.3%Si, 2.5%Cr, 0.5%Cu, 0.04%N, 0.01%Al, 0.019% P, 0.002% S, and surplus Fe And impurity element, it is austenite structure under room temperature, Rp0.2=435MPa, Rm=800MPa, A=57% ,-196 DEG C of Charpy-type test KV2=126J。
The preparation of above-mentioned economical steel used at ultra-low temperature follows the steps below:
The blank that 260mm is thick is put into and heating furnace is heated to 1080 DEG C and is incubated 180min, the chemical composition of blank and matter thereof Amount mark is respectively 0.45%C, 24%Mn, 0.3%Si, 2.5%Cr, 0.5%Cu, 0.04%N, 0.01%Al, 0.019% P, and 0.002% S, and surplus Fe and impurity element；
To heating after slab roll, rolling mill screwdown code be 220mm-208mm-166mm-133mm-106mm- 80mm-60mm-45mm-34mm-25mm finishing temperature 995 DEG C；
Steel plate after rolling is accelerated cooling online, and 15 DEG C/s of cooldown rate, final cooling temperature 400 DEG C, air cooling is to room afterwards Temperature.
Fig. 1 is the optical microscopy map of embodiment 1 economical steel used at ultra-low temperature metallographic structure, and organization type is austenite.
Embodiment 2
The present embodiment be a kind of thickness be the economical used at ultra-low temperature steel board of 50mm, chemical composition and mass fraction thereof be respectively 0.4%C, 28%Mn, 0.1%Si, 4%Cr, 0.3%Cu, 0.01%N, 0.025%Al, 0.014% P, 0.01% S, and surplus Fe and Impurity element, is austenite structure under room temperature, Rp0.2=455MPa, Rm=880MPa, A=50% ,-196 DEG C of Charpy-type test KV2= 80J。
The preparation of above-mentioned economical steel used at ultra-low temperature follows the steps below:
The blank that 340mm is thick is put into and heating furnace is heated to 1150 DEG C and is incubated 120min, the chemical composition of blank and matter thereof Amount mark is respectively 0.4%C, 28%Mn, 0.1%Si, 4%Cr, 0.3%Cu, 0.01%N, 0.025%Al, 0.014% P, 0.01% S, And surplus Fe and impurity element；
To heating after slab roll, rolling mill screwdown code be 340mm-290mm-256mm-204mm-164mm- 131mm-105mm-84mm-67mm-50mm finishing temperature 970 DEG C；
Steel plate after rolling is accelerated cooling online, and 5 DEG C/s of cooldown rate, final cooling temperature 280 DEG C, air cooling is to room afterwards Temperature.
Fig. 2 is the optical microscopy map of embodiment 2 economical steel used at ultra-low temperature metallographic structure, and organization type is austenite.
Embodiment 3
The present embodiment be a kind of thickness be the economical used at ultra-low temperature steel board of 12mm, chemical composition and mass fraction thereof be respectively 0.3%C, 20%Mn, 0.5%Si, 5.5%Cr, 0.8%Cu, 0.10%N, 0.05%Al, 0.03%P, 0.004%S, and surplus Fe and miscellaneous Prime element, is austenite structure under room temperature, Rp0.2=400MPa, Rm=840MPa, A=66% ,-196 DEG C of Charpy-type test KV2= 151J。
The preparation of above-mentioned economical steel used at ultra-low temperature follows the steps below:
The blank that 150mm is thick is put into and heating furnace is heated to 1220 DEG C and is incubated 90min, the chemical composition of blank and quality thereof Mark is respectively 0.3%C, 20%Mn, 0.5%Si, 5.5%Cr, 0.8%Cu, 0.10%N, 0.05%Al, 0.03%P, 0.004%S, and Surplus Fe and impurity element；
To heating after slab roll, rolling mill screwdown code be 150mm-128mm-108mm-87mm-69mm- 55mm-39mm-27mm-18mm-12mm, finishing temperature 1030 DEG C；
Steel plate after rolling is accelerated cooling, 30 DEG C/s of cooldown rate online, is cooled to room temperature.
Fig. 3 is the optical microscopy map of embodiment 3 economical steel used at ultra-low temperature metallographic structure, and organization type is austenite.
In addition to the implementation, the present invention can also have other embodiments.All employing equivalents or equivalent transformation shape The technical scheme become, all falls within the protection domain of application claims.

Claims (10)

1. an economical steel used at ultra-low temperature, it is characterised in that: its mass percent chemical composition is: C:0.3-0.6%, Mn: 20-28%, Si:0.1-0.5%, Cr:2.5-5.5%, Cu:0.3-0.8%, N:0.01-0.10%, Al:0.01-0.05%, P≤ 0.03%, S≤0.01%, surplus is Fe and inevitable impurity element.
Economical steel used at ultra-low temperature the most as claimed in claim 1, it is characterised in that: described steel used at ultra-low temperature has at normal temperatures Austenite structure.
Economical steel used at ultra-low temperature the most as claimed in claim 1 or 2, it is characterised in that: the plate that described steel used at ultra-low temperature is made The thickness of material is 12-50mm, it is stipulated that nonproportional cyclic straining Rp0.2>=400MPa, tensile strength Rm>=800MPa, elongation percentage A >= 50% ,-196 DEG C of impact test impact absorbing energy KV2≥80J。
Economical steel used at ultra-low temperature the most as claimed in claim 1, it is characterised in that: its thickness is 25mm, its mass percent Chemical composition is: 0.45%C, 24%Mn, 0.3%Si, 2.5%Cr, 0.5%Cu, 0.04%N, 0.01%Al, 0.019% P, 0.002% S, and surplus Fe and inevitable impurity element；It is austenite structure under room temperature, Rp0.2=435MPa, Rm=800MPa, A= 57% ,-196 DEG C of Charpy-type test KV2=126J。
Economical steel used at ultra-low temperature the most as claimed in claim 1, it is characterised in that: its thickness is 50mm, its mass percent Chemical composition is: 0.4%C, 28%Mn, 0.1%Si, 4%Cr, 0.3%Cu, 0.01%N, 0.025%Al, 0.014% P, 0.01% S, with And surplus Fe and inevitable impurity element；It is austenite structure under room temperature, Rp0.2=455MPa, Rm=880MPa, A=50% ,- 196 DEG C of Charpy-type test KV2=80J。
Economical steel used at ultra-low temperature the most as claimed in claim 1, it is characterised in that: its thickness is 12mm, its mass percent Chemical composition is: 0.3%C, 20%Mn, 0.5%Si, 5.5%Cr, 0.8%Cu, 0.10%N, 0.05%Al, 0.03%P, 0.004%S, with And surplus Fe and inevitable impurity element, it is austenite structure under room temperature, Rp0.2=400MPa, Rm=840MPa, A=66% ,- 196 DEG C of Charpy-type test KV2=151J。
The preparation method of economical steel used at ultra-low temperature the most as claimed in claim 1, it is characterised in that: comprise the following steps:
(i) heating: will there is the heating of plate blank of chemical composition identical with described steel used at ultra-low temperature to 1080-1220 DEG C, and be incubated 90-180min；Under high temperature, the alloying element in austenite passes through diffusion way homogenization；
(ii) rolling: the slab after heating is rolled, pass deformation >=12%, total deformation >=85%, finishing temperature 970- 1030℃；Obtained the isometry austenite crystal of size uniform by recrystallization softening during rolling；
(iii) cooling: to rolling after steel plate online accelerate cooling, cooldown rate 5-30 DEG C/s, final cooling temperature be room temperature extremely 400 DEG C, after when final cooling temperature is higher than room temperature, acceleration cooling terminates, air cooling is to room temperature；Accelerate the crystal grain under cooling suppression high temperature long Greatly, avoid the formation of the precipitated phase of infringement low-temperature flexibility simultaneously.
The preparation method of economical steel used at ultra-low temperature the most as claimed in claim 4, it is characterised in that: comprise the following steps:
(i) blank thick for 260mm is put into and heating furnace is heated to 1080 DEG C and is incubated 180min, the chemical composition of blank and Mass fraction is respectively 0.45%C, 24%Mn, 0.3%Si, 2.5%Cr, 0.5%Cu, 0.04%N, 0.01%Al, 0.019% P, 0.002% S, and surplus Fe and impurity element；
(ii) rolling the slab after heating, rolling mill screwdown code is 220mm-208mm-166mm-133mm-106mm -80mm-60mm-45mm-34mm-25mm finishing temperature 995 DEG C；
(iii) the steel plate after rolling being accelerated cooling online, 15 DEG C/s of cooldown rate, final cooling temperature 400 DEG C, air cooling is extremely afterwards Room temperature.
The preparation method of economical steel used at ultra-low temperature the most as claimed in claim 4, it is characterised in that: comprise the following steps:
(i) blank thick for 340mm is put into and heating furnace is heated to 1150 DEG C and is incubated 120min, the chemical composition of blank and Mass fraction is respectively 0.4%C, 28%Mn, 0.1%Si, 4%Cr, 0.3%Cu, 0.01%N, 0.025%Al, 0.014% P, and 0.01% S, and surplus Fe and impurity element；
(ii) rolling the slab after heating, rolling mill screwdown code is 340mm-290mm-256mm-204mm-164mm -131mm-105mm-84mm-67mm-50mm finishing temperature 970 DEG C；
(iii) the steel plate after rolling being accelerated cooling online, 5 DEG C/s of cooldown rate, final cooling temperature 280 DEG C, air cooling is to room afterwards Temperature.
The preparation method of economical steel used at ultra-low temperature the most as claimed in claim 4, it is characterised in that: comprise the following steps:
(i) the blank that 150mm is thick is put into and heating furnace is heated to 1220 DEG C and is incubated 90min, the chemical composition of blank and matter thereof Amount mark is respectively 0.3%C, 20%Mn, 0.5%Si, 5.5%Cr, 0.8%Cu, 0.10%N, 0.05%Al, 0.03%P, 0.004%S, with And surplus Fe and impurity element；
(ii) to heating after slab roll, rolling mill screwdown code be 150mm-128mm-108mm-87mm-69mm- 55mm-39mm-27mm-18mm-12mm, finishing temperature 1030 DEG C；
(iii) the steel plate after rolling is accelerated cooling, 30 DEG C/s of cooldown rate online, be cooled to room temperature.
CN201610709859.9A 2016-08-23 2016-08-23 A kind of economical steel used at ultra-low temperature and preparation method thereof Pending CN106222554A (en)

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