CN108531815A - High temperature bolt steel BG25Cr2MoVA and preparation method thereof - Google Patents
High temperature bolt steel BG25Cr2MoVA and preparation method thereof Download PDFInfo
- Publication number
- CN108531815A CN108531815A CN201810505290.3A CN201810505290A CN108531815A CN 108531815 A CN108531815 A CN 108531815A CN 201810505290 A CN201810505290 A CN 201810505290A CN 108531815 A CN108531815 A CN 108531815A
- Authority
- CN
- China
- Prior art keywords
- steel
- cooling
- preparation
- high temperature
- slag
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- 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
- C21D1/26—Methods of annealing
-
- 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
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with 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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium 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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- 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
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with 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
- 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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C2007/0093—Duplex process; Two stage processes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a kind of high temperature bolt steel BG25Cr2MoVA and preparation method thereof, wherein high temperature bolt steel BG25Cr2MoVA, by weight percentage, including following component：C：0.23~0.27%, Si：0.20~0.35%, Mn：0.54~0.62%, P≤0.015%, S≤0.012%, Cr：1.64~1.72%, Mo：0.28~0.32%, V：0.20~0.24%, Ni≤0.15%, Cu≤0.15%, Alt：0.020~0.040%, surplus is iron and inevitable impurity.The high temperature bolt is high with steel BG25Cr2MoVA purity of steel, and high temperature resistant, endurance, stable mechanical property, the preparation method is simple, practical, process stabilizing.
Description
Technical field
The present invention relates to steel preparing technical field, specifically provide a kind of high temperature bolt steel BG25Cr2MoVA and its
Preparation method.
Background technology
Large capacity, putting into operation for high parameter generating set promote Power System in China great development, therefore, to turbine high temperature
The demand of bolt steel is also increasing, and the relationship between quality of bolt steel is to overcritical million unit operations stability, to production
Quality requirement is higher and higher, and each steel mill produces turbine high temperature bolt and mostly uses molding production, lumber recovery greatly with steel at present
Low, of high cost, yield is small, and rhythm of production is slow, and service condition is pessimistic, and there are following problems for continuous casting：
(1) electric furnace continuous casting smelting rhythm is fast, and hot metal ratio is small, and steel scrap alloy content is high；
(2) alloy content of BG25Cr2MoVA steel grades is high, and Cr, Mo, V Composition Control are difficult；
(3) casting process easy tos produce alloying component segregation；
(4) the high heating process of alloy content is not easy to grill thoroughly；
(5) the high operation of rolling of alloy content is larger to milling train drag；
(6) steel need to anneal, and burn steel temperature, time bad control.
Invention content
In consideration of it, the purpose of the present invention is to provide a kind of high temperature bolt steel BG25Cr2MoVA and preparation method thereof, with
It solves the above problems.
One aspect of the present invention provides a kind of high temperature bolt steel BG25Cr2MoVA, by weight percentage, including such as the following group
Point：C：0.23~0.27%, Si：0.20~0.35%, Mn：0.54~0.62%, P≤0.015%, S≤0.012%, Cr：
1.64~1.72%, Mo：0.28~0.32%, V：0.20~0.24%, Ni≤0.15%, Cu≤0.15%, Alt：0.020~
0.040%, surplus is iron and inevitable impurity.
It is preferred that high temperature bolt steel BG25Cr2MoVA, by weight percentage, including following component：C：
0.25%, Si：0.25%, Mn：0.58%, P≤0.012%, S≤0.010%, Cr：1.68%, Mo：0.30%, V：
0.22%, Ni≤0.10%, Cu≤0.10%, Alt：0.030%, surplus is iron and inevitable impurity.
It is blast-melted to pass through successively the present invention also provides a kind of high temperature bolt preparation method of steel BG25Cr2MoVA
Pretreatment → electric furnace smelting → refining furnace LF → vacuum outgas VD → middle billet continuous casting 235mm × 265mm continuous casting billets → step-by-step movement
Stove heat → high-pressure water descaling → roughing mill rolling → Continuous mill train → slow cooling → annealing → finishing → flaw detection → inspection is heated, is obtained
To steel,
Wherein, electric furnace smelting uses 50t electric furnace smeltings, carbon to reach tapping deoxidization alloying after target content requires；
Refining furnace LF operates for white slag, under conditions of ensureing slag mobility, in control basicity of slag (CaO/SiO2) and slag
Oxygen gesture FeO+MnO≤1%, constantly detect molten steel, be finely adjusted alloy, ensure that molten steel composition reaches content requirement；
Vacuum outgas VD：Ensure degasifying effect and promotes inclusion floating, vacuum 25min or more, composition adjustment to satisfaction
Calcium treatment is carried out after internally controlling requirement, so that the field trash in steel is further floated into slag, is improved Molten Steel Cleanliness；
Middle billet continuous casting：Ladle is sealed, using cinder inclusion in big covering agent, tundish covering flux, high alkalinity, in tundish
Argon gas protective casting, M-EMS, adjustment end electromagnetic agitation current strength and secondary coolingwater, smashes column crystal, protects
The maximization for demonstrate,proving equiax crystal, to improve equiaxed zone ratio.
It is preferred that the annealing process is as follows：Steel are heated to 770 ± 10 DEG C with the constant heating rate of 65~75 DEG C/h,
700 ± 10 DEG C are cooled to the constant cooling velocity of 4~6 DEG C/min again, keeps the temperature 2-4h, cooling of then coming out of the stove.
Further preferably, the annealing process is as follows：Steel are heated to 770 DEG C with the constant heating rate of 70 DEG C/h, then
700 DEG C are cooled to the constant cooling velocity of 5 DEG C/min, keeps the temperature 3h, cooling of then coming out of the stove.
Further preferably, the annealing process is as follows：Steel are heated to 700 with the constant heating rate of 65~75 DEG C/h ±
10 DEG C, keep the temperature 2-4h, cooling of then coming out of the stove.
Further preferably, the annealing process is as follows：Steel are heated to 700 DEG C with the constant heating rate of 70 DEG C/h, protect
Warm 3h, cooling of then coming out of the stove.
Beneficial effects of the present invention are as follows：
1, turbine high temperature bolt steel is produced using square billet (235mm × 265mm) in 50t electric furnaces+LF+VD+
BG25Cr2MoVA, realizes the continuous casting of sequence casting, and ton steel cost reduces by 300 yuan or more, realizes electric furnace continuous casting flow
Produce the breakthrough of turbine high temperature bolt steel in batches；
2, it solves electric furnace fast pace and smelts high-alloy steel, improve 80% or more hot metal ratio, control steel scrap is introduced other
Harmful element；
3, refining process realizes the equal control of Cr, Mo, V ingredient, and VD Fruit storages can fully reduce molten steel
In the gas contents such as [O], [H], Calcium treatment ensures that field trash fully floats, ensure that Molten Steel Cleanliness；
4, continuous casting ensure that strand using means such as M-EMS, end electromagnetic agitation, control secondary cooling water flows
Internal soundness uniformity, improves equiaxed zone ratio；
5, heating process ensures that strand is grilled thoroughly, and the operation of rolling carries out temperature-controlled rolling, reduces shadow of the milling train to steel drag
It rings, ensures the uniformity of steel tissue；
6, rational annealing process can ensure homogeneity of steel structure, ensure that steel product stress is small, hardness is low, meets standard
It is required that.
Specific implementation mode
The present invention is further explained below in conjunction with specific embodiment, but the not limitation present invention.
Embodiment 1
High temperature bolt steel BG25Cr2MoVA, by weight percentage, including following component：C：0.23%, Si：0.35%,
Mn：0.54%, P≤0.015%, S≤0.012%, Cr：1.72%, Mo：0.28%, V：0.20%, Ni≤0.15%, Cu≤
0.15%, Alt：0.040%, surplus is iron and inevitable impurity.
The high temperature bolt is as follows with the preparation method of steel BG25Cr2MoVA：
It is blast-melted to pass through pretreatment → electric furnace smelting → refining furnace LF → vacuum outgas VD → middle billet continuous casting successively
235mm × 265mm continuous casting billets → stepped heating stove heat → high-pressure water descaling → roughing mill rolling → Continuous mill train → slow cooling
→ annealing → finishing → flaw detection → inspection, obtains steel,
Wherein, electric furnace smelting uses 50t electric furnace smeltings, carbon to reach tapping deoxidization alloy after target content requires 0.23%
Change；
Refining furnace LF operates for white slag, under conditions of ensureing slag mobility, in control basicity of slag (CaO/SiO2) and slag
Oxygen gesture FeO+MnO≤1%, constantly detect molten steel, be finely adjusted alloy, ensure that molten steel composition reaches content requirement：C：
0.23%, Si：0.35%, Mn：0.54%, P≤0.015%, S≤0.012%, Cr：1.72%, Mo：0.28%, V：
0.20%, Ni≤0.15%, Cu≤0.15%, Alt：0.040%；
Vacuum outgas VD：Ensure degasifying effect and promotes inclusion floating, vacuum 25min or more, composition adjustment to satisfaction
Internally controlling requirement (C：0.23%, Si：0.35%, Mn：0.54%, P≤0.015%, S≤0.012%, Cr：1.72%, Mo：
0.28%, V：0.20%, Ni≤0.15%, Cu≤0.15%, Alt：0.040%) Calcium treatment is carried out after, makes the field trash in steel
It further floats and enters in slag, improve Molten Steel Cleanliness；
Middle billet continuous casting：Ladle is sealed, using cinder inclusion in big covering agent, tundish covering flux, high alkalinity, in tundish
Argon gas protective casting, M-EMS, adjustment end electromagnetic agitation current strength and secondary coolingwater, smashes column crystal, protects
The maximization for demonstrate,proving equiax crystal, to improve equiaxed zone ratio.
Wherein, annealing process is as follows：Steel are heated to 780 DEG C with the constant heating rate of 65 DEG C/h, then with 4 DEG C/min's
Constant cooling velocity is cooled to 710 DEG C, keeps the temperature 4h, cooling of then coming out of the stove.
Embodiment 2
High temperature bolt steel BG25Cr2MoVA, by weight percentage, including following component：C：0.27%, Si：0.20%,
Mn：0.62%, P≤0.015%, S≤0.012%, Cr：1.64%, Mo：0.32%, V：0.24%, Ni≤0.15%, Cu≤
0.15%, Alt：0.020%, surplus is iron and inevitable impurity.
The high temperature bolt is as follows with the preparation method of steel BG25Cr2MoVA：
It is blast-melted to pass through pretreatment → electric furnace smelting → refining furnace LF → vacuum outgas VD → middle billet continuous casting successively
235mm × 265mm continuous casting billets → stepped heating stove heat → high-pressure water descaling → roughing mill rolling → Continuous mill train → slow cooling
→ annealing → finishing → flaw detection → inspection, obtains steel,
Wherein, electric furnace smelting uses 50t electric furnace smeltings, carbon to reach tapping deoxidization alloy after target content requires 0.27%
Change；
Refining furnace LF operates for white slag, under conditions of ensureing slag mobility, in control basicity of slag (CaO/SiO2) and slag
Oxygen gesture FeO+MnO≤1%, constantly detect molten steel, be finely adjusted alloy, ensure that molten steel composition reaches content requirement：C：
0.27%, Si：0.20%, Mn：0.62%, P≤0.015%, S≤0.012%, Cr：1.64%, Mo：0.32%, V：
0.24%, Ni≤0.15%, Cu≤0.15%, Alt：0.020%；
Vacuum outgas VD：Ensure degasifying effect and promotes inclusion floating, vacuum 25min or more, composition adjustment to satisfaction
Internally controlling requirement (C：0.27%, Si：0.20%, Mn：0.62%, P≤0.015%, S≤0.012%, Cr：1.64%, Mo：
0.32%, V：0.24%, Ni≤0.15%, Cu≤0.15%, Alt：0.020%) Calcium treatment is carried out after, makes the field trash in steel
It further floats and enters in slag, improve Molten Steel Cleanliness；
Middle billet continuous casting：Ladle is sealed, using cinder inclusion in big covering agent, tundish covering flux, high alkalinity, in tundish
Argon gas protective casting, M-EMS, adjustment end electromagnetic agitation current strength and secondary coolingwater, smashes column crystal, protects
The maximization for demonstrate,proving equiax crystal, to improve equiaxed zone ratio.
Wherein, annealing process is as follows：Steel are heated to 760 DEG C with the constant heating rate of 75 DEG C/h, then with 6 DEG C/min's
Constant cooling velocity is cooled to 690 DEG C, keeps the temperature 2h, cooling of then coming out of the stove.
Embodiment 3
High temperature bolt steel BG25Cr2MoVA, by weight percentage, including following component：C：0.25%, Si：0.25%,
Mn：0.58%, P≤0.012%, S≤0.010%, Cr：1.68%, Mo：0.30%, V：0.22%, Ni≤0.10%, Cu≤
0.10%, Alt：0.030%, surplus is iron and inevitable impurity.
The high temperature bolt is as follows with the preparation method of steel BG25Cr2MoVA：
It is blast-melted to pass through pretreatment → electric furnace smelting → refining furnace LF → vacuum outgas VD → middle billet continuous casting successively
235mm × 265mm continuous casting billets → stepped heating stove heat → high-pressure water descaling → roughing mill rolling → Continuous mill train → slow cooling
→ annealing → finishing → flaw detection → inspection, obtains steel,
Wherein, electric furnace smelting uses 50t electric furnace smeltings, carbon to reach tapping deoxidization alloy after target content requires 0.25%
Change；
Refining furnace LF operates for white slag, under conditions of ensureing slag mobility, in control basicity of slag (CaO/SiO2) and slag
Oxygen gesture FeO+MnO≤1%, constantly detect molten steel, be finely adjusted alloy, ensure that molten steel composition reaches content requirement：C：
0.25%, Si：0.25%, Mn：0.58%, P≤0.012%, S≤0.010%, Cr：1.68%, Mo：0.30%, V：
0.22%, Ni≤0.10%, Cu≤0.10%, Alt：0.030%；
Vacuum outgas VD：Ensure degasifying effect and promotes inclusion floating, vacuum 25min or more, composition adjustment to satisfaction
Internally controlling requirement (C：0.25%, Si：0.25%, Mn：0.58%, P≤0.012%, S≤0.010%, Cr：1.68%, Mo：
0.30%, V：0.22%, Ni≤0.10%, Cu≤0.10%, Alt：0.030%) Calcium treatment is carried out after, makes the field trash in steel
It further floats and enters in slag, improve Molten Steel Cleanliness；
Middle billet continuous casting：Ladle is sealed, using cinder inclusion in big covering agent, tundish covering flux, high alkalinity, in tundish
Argon gas protective casting, M-EMS, adjustment end electromagnetic agitation current strength and secondary coolingwater, smashes column crystal, protects
The maximization for demonstrate,proving equiax crystal, to improve equiaxed zone ratio.
Wherein, the annealing process is as follows：Steel are heated to 770 DEG C with the constant heating rate of 70 DEG C/h, then with 5 DEG C/
The constant cooling velocity of min is cooled to 700 DEG C, keeps the temperature 3h, cooling of then coming out of the stove.
Embodiment 4
Difference from example 1 is that：
The annealing process is as follows：Steel are heated to 710 DEG C with the constant heating rate of 65 DEG C/h, keep the temperature 2h, then go out
Furnace cooling is but.
Embodiment 5
With embodiment 2 the difference is that：
The annealing process is as follows：Steel are heated to 690 DEG C with the constant heating rate of 75 DEG C/h, keep the temperature 4h, then go out
Furnace cooling is but.
Embodiment 6
With embodiment 3 the difference is that：
The annealing process is as follows：Steel are heated to 700 DEG C with the constant heating rate of 70 DEG C/h, keep the temperature 3h, then go out
Furnace cooling is but.
Steel obtained in 100 stove embodiments 1 to embodiment 6 are respectively taken to be tested, test result is shown, steel obtained
Purity of steel it is high, high temperature resistant, endurance, stable mechanical property meets user's requirement.
Claims (7)
1. high temperature bolt steel BG25Cr2MoVA, which is characterized in that by weight percentage, including following component：C：0.23~
0.27%, Si：0.20~0.35%, Mn：0.54~0.62%, P≤0.015%, S≤0.012%, Cr：1.64~1.72%,
Mo：0.28~0.32%, V：0.20~0.24%, Ni≤0.15%, Cu≤0.15%, Alt：0.020~0.040%, surplus
For iron and inevitable impurity.
2. high temperature bolt described in accordance with the claim 1 steel BG25Cr2MoVA, which is characterized in that by weight percentage, including
Following component：C：0.25%, Si：0.25%, Mn：0.58%, P≤0.012%, S≤0.010%, Cr：1.68%, Mo：
0.30%, V：0.22%, Ni≤0.10%, Cu≤0.10%, Alt：0.030%, surplus is iron and inevitable impurity.
3. the preparation method of steel BG25Cr2MoVA of high temperature bolt described in claims 1 or 2, which is characterized in that it is blast-melted according to
Secondary process pretreatment → electric furnace smelting → refining furnace LF → vacuum outgas VD → middle billet continuous casting 235mm × 265mm continuous casting billets →
Stepped heating stove heat → high-pressure water descaling → roughing mill rolling → Continuous mill train → slow cooling → annealing → finishing → flaw detection →
It examines, obtains steel,
Wherein, electric furnace smelting uses 50t electric furnace smeltings, carbon to reach tapping deoxidization alloying after target content requires；
Refining furnace LF operates for white slag, under conditions of ensureing slag mobility, the oxygen in control basicity of slag (CaO/SiO2) and slag
Gesture FeO+MnO≤1%, constantly detects molten steel, is finely adjusted alloy, ensures that molten steel composition reaches content requirement；
Vacuum outgas VD：Ensure degasifying effect and promote inclusion floating, vacuum 25min or more, composition adjustment is to meeting internal control
Calcium treatment is carried out after it is required that, so that the field trash in steel is further floated into slag, is improved Molten Steel Cleanliness；
Middle billet continuous casting：Ladle is sealed, using cinder inclusion in big covering agent, tundish covering flux, high alkalinity, argon gas in tundish
Protective casting, M-EMS, adjustment end electromagnetic agitation current strength and secondary coolingwater, smashes column crystal, ensure etc.
The maximization of axialite, to improve equiaxed zone ratio.
4. preparation method described in accordance with the claim 3, it is characterised in that：The annealing process is as follows：Steel with 65~75 DEG C/
The constant heating rate of h is heated to 770 ± 10 DEG C, then is cooled to 700 ± 10 DEG C with the constant cooling velocity of 4~6 DEG C/min, protects
Warm 2-4h, cooling of then coming out of the stove.
5. preparation method according to claim 4, it is characterised in that：The annealing process is as follows：Steel are with 70 DEG C/h's
Constant heating rate is heated to 770 DEG C, then is cooled to 700 DEG C with the constant cooling velocity of 5 DEG C/min, keeps the temperature 3h, then comes out of the stove
It is cooling.
6. preparation method described in accordance with the claim 3, it is characterised in that：The annealing process is as follows：Steel with 65~75 DEG C/
The constant heating rate of h is heated to 700 ± 10 DEG C, keeps the temperature 2-4h, cooling of then coming out of the stove.
7. preparation method according to claim 6, it is characterised in that：The annealing process is as follows：Steel are with 70 DEG C/h's
Constant heating rate is heated to 700 DEG C, keeps the temperature 3h, cooling of then coming out of the stove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810505290.3A CN108531815A (en) | 2018-05-24 | 2018-05-24 | High temperature bolt steel BG25Cr2MoVA and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810505290.3A CN108531815A (en) | 2018-05-24 | 2018-05-24 | High temperature bolt steel BG25Cr2MoVA and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108531815A true CN108531815A (en) | 2018-09-14 |
Family
ID=63471772
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810505290.3A Pending CN108531815A (en) | 2018-05-24 | 2018-05-24 | High temperature bolt steel BG25Cr2MoVA and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108531815A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110904388A (en) * | 2019-12-30 | 2020-03-24 | 本钢板材股份有限公司 | Excavator crawler belt steel BG45MnCrB and preparation method thereof |
| CN110964984A (en) * | 2019-12-30 | 2020-04-07 | 本钢板材股份有限公司 | Steel SAE4160M for middle and large automobile shaft sleeve and production process thereof |
| CN111004962A (en) * | 2019-12-30 | 2020-04-14 | 本钢板材股份有限公司 | Steel BG80MnCr for steel balls of ball mill and preparation method thereof |
| CN112522581A (en) * | 2019-09-19 | 2021-03-19 | 宝山钢铁股份有限公司 | Method for producing 30CrMo hot rolled steel plate/strip by strip continuous casting |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07112235A (en) * | 1993-10-18 | 1995-05-02 | Nippon Steel Corp | Manufacture of high strength bolt having excellent delayed breakdown resistant characteristic |
| JP2004307932A (en) * | 2003-04-07 | 2004-11-04 | Daido Steel Co Ltd | Steel for bolt having excellent delayed fracture resistance, and method of producing bolt |
| CN102094153A (en) * | 2011-03-02 | 2011-06-15 | 上海工程技术大学 | High-strength high-toughness alloy steel for bolts and preparation method thereof |
| CN103966411A (en) * | 2013-01-24 | 2014-08-06 | 宝山钢铁股份有限公司 | Manufacturing method for medium-carbon cold forging steel rods and wires |
| CN107299278A (en) * | 2017-06-01 | 2017-10-27 | 山东寿光巨能特钢有限公司 | A kind of resistance to ultralow temperature impact wind-powered electricity generation high-strength bolt steel making method |
| CN107675101A (en) * | 2017-08-15 | 2018-02-09 | 石家庄钢铁有限责任公司 | A kind of corrosion-resistant railway bolt and railway spike steel and its manufacture method |
-
2018
- 2018-05-24 CN CN201810505290.3A patent/CN108531815A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07112235A (en) * | 1993-10-18 | 1995-05-02 | Nippon Steel Corp | Manufacture of high strength bolt having excellent delayed breakdown resistant characteristic |
| JP2004307932A (en) * | 2003-04-07 | 2004-11-04 | Daido Steel Co Ltd | Steel for bolt having excellent delayed fracture resistance, and method of producing bolt |
| CN102094153A (en) * | 2011-03-02 | 2011-06-15 | 上海工程技术大学 | High-strength high-toughness alloy steel for bolts and preparation method thereof |
| CN103966411A (en) * | 2013-01-24 | 2014-08-06 | 宝山钢铁股份有限公司 | Manufacturing method for medium-carbon cold forging steel rods and wires |
| CN107299278A (en) * | 2017-06-01 | 2017-10-27 | 山东寿光巨能特钢有限公司 | A kind of resistance to ultralow temperature impact wind-powered electricity generation high-strength bolt steel making method |
| CN107675101A (en) * | 2017-08-15 | 2018-02-09 | 石家庄钢铁有限责任公司 | A kind of corrosion-resistant railway bolt and railway spike steel and its manufacture method |
Non-Patent Citations (1)
| Title |
|---|
| 娄春玲: "25Cr2MoVA钢调质规范对力学性能的影响", 《理化检验-物理分册》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112522581A (en) * | 2019-09-19 | 2021-03-19 | 宝山钢铁股份有限公司 | Method for producing 30CrMo hot rolled steel plate/strip by strip continuous casting |
| CN110904388A (en) * | 2019-12-30 | 2020-03-24 | 本钢板材股份有限公司 | Excavator crawler belt steel BG45MnCrB and preparation method thereof |
| CN110964984A (en) * | 2019-12-30 | 2020-04-07 | 本钢板材股份有限公司 | Steel SAE4160M for middle and large automobile shaft sleeve and production process thereof |
| CN111004962A (en) * | 2019-12-30 | 2020-04-14 | 本钢板材股份有限公司 | Steel BG80MnCr for steel balls of ball mill and preparation method thereof |
| CN110964984B (en) * | 2019-12-30 | 2021-09-24 | 本钢板材股份有限公司 | Steel SAE4160M for middle and large automobile shaft sleeve and production process thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101328522B (en) | Smelting production method of low activation martensitic steel for fusion reactor | |
| CN102758144B (en) | Production method for steel ingot of large-sized high-nitrogen retaining ring steel | |
| CN108546880A (en) | Steel BG22SiMnNi2CrMoA and preparation method thereof | |
| CN108531815A (en) | High temperature bolt steel BG25Cr2MoVA and preparation method thereof | |
| CN105088094B (en) | A kind of manufacture method for controlling nitrogen austenitic stainless steel heavy forging | |
| CN103789708B (en) | 13Cr9Mo2Co1NiVNbNB super martensitic heat resisting steel and production method thereof | |
| CN104328353A (en) | Rare-earth-type 0Cr17Ni4Cu4Nb martensitic precipitation-hardening stainless steel and preparation method thereof | |
| CN107130168A (en) | Utilize the austenitic stainless steel and its production technology of smelting laterite-nickel ores | |
| CN103320718B (en) | The production method of 316LN nuclear power austenitic stainless steel | |
| CN105385931A (en) | Method for smelting high-nitrogen steel at normal pressure by two steps | |
| KR20240005716A (en) | High-efficiency welded bridge steel and its manufacturing method | |
| CN107841687A (en) | A kind of smelting process of ultralow boron steel | |
| CN105132621B (en) | Smelting process for steel for low-silicon aluminum steel-free welding wire | |
| CN102260835B (en) | Nuclear power steel 18MnNiMo and its preparation method | |
| CN103433642B (en) | Low-hydrogen basic electrode for 1Ni9 low-temperature steel welding and preparation method of low-hydrogen basic electrode | |
| CN109023023A (en) | A kind of manufacturing method of rare-earth heat-resistant steel board | |
| CN102367542A (en) | Deformation aging performance-guaranteed S355K2-Z35 moderately thick plate and production method thereof | |
| CN117230360B (en) | Preparation method of single-vacuum 300M steel | |
| CN106893946A (en) | Using the low-carbon (LC) austenitic stainless steel including molybdenum and its production technology of smelting laterite-nickel ores | |
| CN109628827A (en) | A kind of low-temperature welding cracks sensibility high-strength steel plate HYQ620 and its production method | |
| CN103695787A (en) | Weather-proof structural steel S355K2W thick plate and production method | |
| CN109852881B (en) | Steel for 45CrNiMoVA drill tool and production method thereof | |
| CN103160648A (en) | Method of smelting ultra-low carbon steel in LF (Ladle Furnace) | |
| CN107604127B (en) | The technique for smelting precipitation hardening steel using vacuum decarburization furnace | |
| CN110230010A (en) | A kind of high cleanliness austenite is without magnetic Retaining Ring Steel and its production technology |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180914 |
|
| RJ01 | Rejection of invention patent application after publication |