CN110499407A - A kind of nuclear power I level security cover super-thick steel plate Tempering and Quenching production method - Google Patents
A kind of nuclear power I level security cover super-thick steel plate Tempering and Quenching production method Download PDFInfo
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- CN110499407A CN110499407A CN201910759211.6A CN201910759211A CN110499407A CN 110499407 A CN110499407 A CN 110499407A CN 201910759211 A CN201910759211 A CN 201910759211A CN 110499407 A CN110499407 A CN 110499407A
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
-
- 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
- C21D2211/002—Bainite
-
- 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
- C21D2211/005—Ferrite
Abstract
The invention discloses a kind of nuclear power I level security cover super-thick steel plate Tempering and Quenching production methods, the Tempering and Quenching production method uses the hardening and tempering process of quenching+tempering, hardening heat is 900~930 DEG C, total 140~260min of heating time, maximum amount of water >=7600m3, roller 2.0~2.2m/min of speed, tempering temperature is 640~680 DEG C, and total heating time >=4.5min/mm comes out of the stove air-cooled.The present invention obtains tempering bainite+ferritic structure of crystal grain refinement, organizes 7.5~8.5 grades of grain size；Yield strength >=650MPa, 700~860MPa of tensile strength, A50 >=18%, anti-lamellar tearing performance number >=55%, -18 DEG C of low-temperature impact toughness average value >=120J, lateral expansion >=0.85mm has the characteristics that simple method, stable product quality, batch production can be achieved.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of nuclear power I level security cover super-thick steel plate Tempering and Quenching is raw
Production method.
Background technique
To realize sustainable development, it is necessary to which clean energy resource is greatly developed in Expedite the application energy-saving and emission-reduction, and Nuclear Power Development project is
Ensure that national economy is quick, development of the becoming better energy is basic.World nuclear technology development and operation it was verified that nuclear energy has
Cleaning, advantage that is safe and can providing stable power on a large scale are increasingly subject to favor.Super thick ultra-wide steel plate is as the non-energy of nuclear power station
Dynamic security system prevents last one of safety curtain of radiation, very high to the performance requirement of used steel plate.As Nuclear Safety
With super thick ultra-wide steel plate, performance requirement is equally very high, needs to use special heat treatment method progress quenched, to meet need
It asks.
Currently, the developing direction in industry should increase quenched heat on the basis of equipment guarantee ability is constantly promoted
Treatment process research carries out brainstorm subject in particular for nuclear power I level security cover super-thick steel plate quenching-and-tempering process, sets about grinding
Study carefully that quenching technical promotes the tackling key problem of steel plate harden ability, tempering process improvement is tackled problems, captures and restrict the special thick steel of nuclear power I level security cover
The Tempering and Quenching method of plate stability, fills up domestic technique blank.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of nuclear power I level security cover super-thick steel plate Tempering and Quenching producers
Method.The invention is precisely controlled by quenching+tempering technological parameter, obtains the tempering that steel plate through thickness direction is crystal grain refinement
Bainite+ferrite, tempering bainite tissue >=55%, ferritic structure≤45%, the good organization that 7.5~8.5 grades of grain size
Matrix, steel plate overall mechanical properties: yield strength >=650MPa, 700~860MPa of tensile strength, A50 >=18%, anti-stratiform are torn
Performance number >=55%, -18 DEG C of low-temperature impact toughness average value >=120J are split, lateral expansion >=0.85mm produces credit rating
Reach nuclear power I level security cover super-thick steel plate Limit specifications thickness 120mm, width 3830mm.
In order to solve the above technical problems, the technical solution used in the present invention is: a kind of nuclear power I level security cover super-thick steel plate
Tempering and Quenching production method, the Tempering and Quenching production method use the hardening and tempering process of quenching+tempering；Hardening heat is
900~930 DEG C, total 140~260min of heating time, maximum amount of water >=7600m3, roller 2.0~2.2m/min of speed, tempering temperature
It is 640~680 DEG C, total heating time >=4.5min/mm comes out of the stove air-cooled.
Quenching technical of the present invention, steel plate laminar flow is cooled to room temperature after quenching, section cooling rate >=150 DEG C/min,
Steel plate waves >=20min, the high pressure section pressure >=8MPa, institute in low pressure stage after the high pressure section of laminar cooling system is cooling
State low pressure stage pressure 3MPa~5MPa.
Steel plate thickness limit 120mm of the present invention, Limit Width 3830mm.
Steel plate through thickness of the present invention direction is tempering bainite+ferrite of crystal grain refinement, tempering bainite tissue
>=55%, ferritic structure≤45%；7.5~8.5 grades of grain size.
The present invention, the steel plate yield strength >=650MPa, 700~860MPa of tensile strength, A50 >=18%, anti-stratiform are torn
Split performance number >=55%, -18 DEG C of low-temperature impact toughness average value >=120J, lateral expansion >=0.85mm.
Steel plate chemical component of the present invention composition and its mass percentage are as follows: C≤0.21%, Si:0.20~0.35%,
Mn:0.45~0.70%, P≤0.015%, S≤0.003%, Ni:1.20~1.50%, Cr:0.85~1.20%, Mo:0.45~
0.60%, Alt >=0.20%, B:0.001~0.005%, remaining is Fe and inevitable impurity element.
The beneficial effects of adopting the technical scheme are that the 1, present invention passes through Quenching plus tempering process
Innovation realizes that steel plate through thickness direction obtains tempering bainite+ferritic structure of crystal grain refinement, organizes grain size 7.5~8.5
Grade.2, nuclear power I level security cover super-thick steel plate yield strength of the present invention >=650MPa, 700~860MPa of tensile strength；A50≥
18%, anti-lamellar tearing performance number >=55%, -18 DEG C of low-temperature impact toughness average value >=120J, lateral expansion >=0.85mm, by force
Toughness matching is reasonable, high comprehensive performance.3, the present invention has simple method, stable product quality, batch production can be achieved
Feature.
Specific embodiment
The present invention will be further described in detail below with reference to specific embodiments.
Embodiment 1
The present embodiment nuclear power I level security cover super-thick steel plate is with a thickness of 120mm, width 3830mm, and chemical component forms and matter
Amount percentage composition is shown in Table 1.
The present embodiment nuclear power I level security cover super-thick steel plate Tempering and Quenching production method uses the quenched work of quenching+tempering
Skill, specific process step are as described below:
(1) quenching technical: hardening heat is 930 DEG C, total heating time 240min, maximum amount of water 8600m3, roller speed 2.0m/min,
Steel plate laminar flow is cooled to room temperature after quenching, 200 DEG C/min of section cooling rate, high pressure section pressure of the steel plate in laminar cooling system
10MPa, after cooling, in 4MPa low pressure stage pressure-swing 25min；
(2) tempering process: tempering temperature is 670 DEG C, and soaking time 4.5min/mm comes out of the stove air-cooled.
The present embodiment nuclear power I level security cover super-thick steel plate through thickness direction obtains tempering bainite+iron element of crystal grain refinement
Body tissue, tempering bainite tissue 58%, ferritic structure 42% organize 8.0 grades of grain size；Yield strength 670MPa, tension are strong
Spend 835MPa；A50:23%, anti-lamellar tearing performance number: 57%, 58%, 56%, -18 DEG C of low-temperature impact toughness average values: 145J,
164J, 158J, lateral expansion: 1.85mm, 1.80mm, 2.10mm, obdurability matching is reasonable, high comprehensive performance.
Embodiment 2
The present embodiment nuclear power I level security cover super-thick steel plate is with a thickness of 100mm, width 3800mm, and chemical component forms and matter
Amount percentage composition is shown in Table 1.
The present embodiment nuclear power I level security cover super-thick steel plate Tempering and Quenching production method uses the quenched work of quenching+tempering
Skill, specific process step are as described below:
(1) quenching technical: hardening heat is 920 DEG C, total heating time 180min, maximum amount of water 8200m3, roller speed 2.0m/min,
Steel plate laminar flow is cooled to room temperature after quenching, 200 DEG C/min of section cooling rate, high pressure section pressure of the steel plate in laminar cooling system
9MPa, after cooling, in 3.5MPa low pressure stage pressure-swing 20min；
(2) tempering process: tempering temperature is 660 DEG C, and soaking time 4.7min/mm comes out of the stove air-cooled.
The present embodiment nuclear power I level security cover super-thick steel plate through thickness direction obtains tempering bainite+iron element of crystal grain refinement
Body tissue, tempering bainite tissue 65%, ferritic structure 35% organize 8.0 grades of grain size；Yield strength 650MPa, tension are strong
Spend 827MPa；A50:25%, anti-lamellar tearing performance number: 62%, 58%, 66%, -18 DEG C of low-temperature impact toughness average values: 138J,
157J, 166J, lateral expansion: 1.87mm, 1.85mm, 1.97mm, obdurability matching is reasonable, high comprehensive performance.
Embodiment 3
The present embodiment nuclear power I level security cover super-thick steel plate is with a thickness of 80mm, width 3685mm, and chemical component forms and quality
Percentage composition is shown in Table 1.
The present embodiment nuclear power I level security cover super-thick steel plate Tempering and Quenching production method uses the quenched work of quenching+tempering
Skill, specific process step are as described below:
(1) quenching technical: hardening heat is 915 DEG C, total heating time 220min, maximum amount of water 8400m3, roller speed 2.2m/min,
Steel plate laminar flow is cooled to room temperature after quenching, 180 DEG C/min of section cooling rate, high pressure section pressure of the steel plate in laminar cooling system
11MPa, after cooling, in 4.5MPa low pressure stage pressure-swing 22min；
(2) tempering process: tempering temperature is 650 DEG C, and soaking time 4.6min/mm comes out of the stove air-cooled.
The present embodiment nuclear power I level security cover super-thick steel plate through thickness direction obtains tempering bainite+iron element of crystal grain refinement
Body tissue, tempering bainite tissue 75%, ferritic structure 25% organize 8.5 grades of grain size；Yield strength 658MPa, tension are strong
Spend 803MPa；A50:27%, anti-lamellar tearing performance number: 59%, 56%, 55%, -18 DEG C of low-temperature impact toughness average values: 148J,
157J, 148J, lateral expansion: 1.67mm, 1.69mm, 1.67mm, obdurability matching is reasonable, high comprehensive performance.
Embodiment 4
The present embodiment nuclear power I level security cover super-thick steel plate is with a thickness of 60mm, width 3750mm, and chemical component forms and quality
Percentage composition is shown in Table 1.
The present embodiment nuclear power I level security cover super-thick steel plate Tempering and Quenching production method uses the quenched work of quenching+tempering
Skill, specific process step are as described below:
(1) quenching technical: hardening heat is 925 DEG C, total heating time 165min, maximum amount of water 7800m3, roller speed 2.1m/min,
Steel plate laminar flow is cooled to room temperature after quenching, 150 DEG C/min of section cooling rate, high pressure section pressure of the steel plate in laminar cooling system
9.5MPa, after cooling, in 3MPa low pressure stage pressure-swing 24min；
(2) tempering process: tempering temperature is 655 DEG C, and soaking time 4.8min/mm comes out of the stove air-cooled.
The present embodiment nuclear power I level security cover super-thick steel plate through thickness direction obtains tempering bainite+iron element of crystal grain refinement
Body tissue, tempering bainite tissue 62%, ferritic structure 38% organize 8.5 grades of grain size；Yield strength 657MPa, tension are strong
Spend 786MPa；A50:28%, anti-lamellar tearing performance number: 62%, 55%, 65%, -18 DEG C of low-temperature impact toughness average values: 167J,
160J, 168J, lateral expansion: 1.77mm, 2.19mm, 2.13mm, obdurability matching is reasonable, high comprehensive performance.
Embodiment 5
The present embodiment nuclear power I level security cover super-thick steel plate is with a thickness of 40mm, width 3800mm, and chemical component forms and quality
Percentage composition is shown in Table 1.
The present embodiment nuclear power I level security cover super-thick steel plate Tempering and Quenching production method uses the quenched work of quenching+tempering
Skill, specific process step are as described below:
(1) quenching technical: hardening heat is 900 DEG C, total heating time 140min, maximum amount of water 8200m3, roller speed 2.0m/min,
Steel plate laminar flow is cooled to room temperature after quenching, 210 DEG C/min of section cooling rate, high pressure section pressure of the steel plate in laminar cooling system
10.5MPa, after cooling, in 5MPa low pressure stage pressure-swing 23min；
(2) tempering process: tempering temperature is 640 DEG C, and soaking time 5.0min/mm comes out of the stove air-cooled.
The present embodiment nuclear power I level security cover super-thick steel plate through thickness direction obtains tempering bainite+iron element of crystal grain refinement
Body tissue, tempering bainite tissue 70%, ferritic structure 30% organize 7.5 grades of grain size；Yield strength 698MPa, tension are strong
Spend 856MPa；A50:26%, anti-lamellar tearing performance number: 58%, 57%, 55%, -18 DEG C of low-temperature impact toughness average values: 178J,
178J, 188J, lateral expansion: 1.88mm, 2.07mm, 2.21mm, obdurability matching is reasonable, high comprehensive performance.
Embodiment 6
The present embodiment nuclear power I level security cover super-thick steel plate is with a thickness of 90mm, width 3680mm, and chemical component forms and quality
Percentage composition is shown in Table 1.
The present embodiment nuclear power I level security cover super-thick steel plate Tempering and Quenching production method uses the quenched work of quenching+tempering
Skill, specific process step are as described below:
(1) quenching technical: hardening heat is 910 DEG C, total heating time 230min, maximum amount of water 8600m3, roller speed 2.1m/min,
Steel plate laminar flow is cooled to room temperature after quenching, 190 DEG C/min of section cooling rate, high pressure section pressure of the steel plate in laminar cooling system
8.5MPa, after cooling, in 4MPa low pressure stage pressure-swing 27min；
(2) tempering process: tempering temperature is 655 DEG C, and soaking time 4.6min/mm comes out of the stove air-cooled.
The present embodiment nuclear power I level security cover super-thick steel plate through thickness direction obtains tempering bainite+iron element of crystal grain refinement
Body tissue, tempering bainite tissue 69%, ferritic structure 31% organize 8.0 grades of grain size；Yield strength 668MPa, tension are strong
Spend 702MPa；A50:19%, anti-lamellar tearing performance number: 58%, 57%, 55%, -18 DEG C of low-temperature impact toughness average values: 138J,
143J, 151J, lateral expansion: 1.05mm, 1.17mm, 1.21mm, obdurability matching is reasonable, high comprehensive performance.
Embodiment 7
The present embodiment nuclear power I level security cover super-thick steel plate is with a thickness of 70mm, width 3720mm, and chemical component forms and quality
Percentage composition is shown in Table 1.
The present embodiment nuclear power I level security cover super-thick steel plate Tempering and Quenching production method uses the quenched work of quenching+tempering
Skill, specific process step are as described below:
(1) quenching technical: hardening heat is 915 DEG C, total heating time 185min, maximum amount of water 8300m3, roller speed 2.0m/min,
Steel plate laminar flow is cooled to room temperature after quenching, 180 DEG C/min of section cooling rate, high pressure section pressure of the steel plate in laminar cooling system
8MPa, after cooling, in 5MPa low pressure stage pressure-swing 26min；
(2) tempering process: tempering temperature is 645 DEG C, and soaking time 5.5min/mm comes out of the stove air-cooled.
The present embodiment nuclear power I level security cover super-thick steel plate through thickness direction obtains tempering bainite+iron element of crystal grain refinement
Body tissue, tempering bainite tissue 55%, ferritic structure 45% organize 7.5 grades of grain size；Take intensity 692MPa, tensile strength
810MPa；A50:21%, anti-lamellar tearing performance number: 68%, 62%, 65%, -18 DEG C of low-temperature impact toughness average values: 128J,
133J, 141J, lateral expansion: 0.95mm, 1.07mm, 1.01mm, obdurability matching is reasonable, high comprehensive performance.
Embodiment 8
The present embodiment nuclear power I level security cover super-thick steel plate is with a thickness of 110mm, width 3810mm, and chemical component forms and matter
Amount percentage composition is to be shown in Table 1.
The present embodiment nuclear power I level security cover super-thick steel plate Tempering and Quenching production method uses the quenched work of quenching+tempering
Skill, specific process step are as described below:
(1) quenching technical: hardening heat is 920 DEG C, total heating time 260min, maximum amount of water 7600m3, roller speed 2.2m/min,
Steel plate laminar flow is cooled to room temperature after quenching, 150 DEG C/min of section cooling rate, high pressure section pressure of the steel plate in laminar cooling system
12MPa, after cooling, in 4MPa low pressure stage pressure-swing 28min；
(2) tempering process: tempering temperature is 680 DEG C, and soaking time 4.9min/mm comes out of the stove air-cooled.
The present embodiment nuclear power I level security cover super-thick steel plate through thickness direction obtains tempering bainite+iron element of crystal grain refinement
Body tissue, tempering bainite tissue 57%, ferritic structure 43% organize 8.5 grades of grain size；Take intensity 681MPa, tensile strength
793MPa；A50:24%, anti-lamellar tearing performance number: 63%, 59,61%, -18 DEG C of low-temperature impact toughness average values: 148J, 153J,
151J, lateral expansion: 1.95mm, 1.87mm, 2.01mm, obdurability matching is reasonable, high comprehensive performance.
The chemical component of embodiment 1-8 nuclear power I level security cover super-thick steel plate forms and its mass percentage (%)
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to the present invention into
Go detailed description, those skilled in the art should understand that: it can still modify to the present invention or equally replace
It changes, without departing from the spirit or scope of the invention, or any substitutions, should all cover and be wanted in right of the invention
It asks in range.
Claims (6)
1. a kind of nuclear power I level security cover super-thick steel plate Tempering and Quenching production method, which is characterized in that the Tempering and Quenching is raw
Production method uses the hardening and tempering process of quenching+tempering；Hardening heat is 900~930 DEG C, total 140~260min of heating time, maximum
Water >=7600m3, roller 2.0~2.2m/min of speed, tempering temperature is 640~680 DEG C, total heating time >=4.5min/mm, out
Furnace is air-cooled.
2. a kind of nuclear power I level security cover super-thick steel plate Tempering and Quenching production method according to claim 1, feature exist
In the quenching technical, steel plate laminar flow is cooled to room temperature after quenching, section cooling rate >=150 DEG C/min, and steel plate is cold in laminar flow
But after the high pressure section of system is cooling, >=20min, the high pressure section pressure >=8MPa, the low pressure stage pressure are waved in low pressure stage
3MPa~5MPa.
3. a kind of nuclear power I level security cover super-thick steel plate Tempering and Quenching production method according to claim 1, feature exist
In the steel plate thickness limit 120mm, Limit Width 3830mm.
4. a kind of nuclear power I level security cover super-thick steel plate Tempering and Quenching producer according to claim 1 to 3
Method, which is characterized in that steel plate through thickness direction is tempering bainite+ferrite of crystal grain refinement, tempering bainite tissue
>=55%, ferritic structure≤45%；7.5~8.5 grades of grain size.
5. a kind of nuclear power I level security cover super-thick steel plate Tempering and Quenching producer according to claim 1 to 3
Method, which is characterized in that the steel plate yield strength >=650MPa, 700~860MPa of tensile strength, A50 >=18%, anti-stratiform are torn
Split performance number >=55%, -18 DEG C of low-temperature impact toughness average value >=120J, lateral expansion >=0.85mm.
6. a kind of nuclear power I level security cover super-thick steel plate Tempering and Quenching producer according to claim 1 to 3
Method, which is characterized in that steel plate chemical component composition and its mass percentage are as follows: C≤0.21%, Si:0.20~0.35%,
Mn:0.45~0.70%, P≤0.015%, S≤0.003%, Ni:1.20~1.50%, Cr:0.85~1.20%, Mo:0.45~
0.60%, Alt >=0.20%, B:0.001~0.005%, remaining is Fe and inevitable impurity element.
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| CN109136743A (en) * | 2018-07-13 | 2019-01-04 | 舞阳钢铁有限责任公司 | A kind of 1 grade of equipment large-scale steel ingot of nuclear power projects core and its production method |
| CN110117705A (en) * | 2019-04-09 | 2019-08-13 | 舞阳钢铁有限责任公司 | A kind of normalizing type nuclear pressure container equipment bearing heat treatment method of steel plate |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111394546A (en) * | 2020-03-27 | 2020-07-10 | 舞阳钢铁有限责任公司 | Heat treatment method of extra-thick, extra-wide and extra-long chromium-molybdenum steel plate |
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Application publication date: 20191126 |