CN109112257A - A kind of hot rolling mould steel and its manufacturing method - Google Patents

A kind of hot rolling mould steel and its manufacturing method Download PDF

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Publication number
CN109112257A
CN109112257A CN201811298205.7A CN201811298205A CN109112257A CN 109112257 A CN109112257 A CN 109112257A CN 201811298205 A CN201811298205 A CN 201811298205A CN 109112257 A CN109112257 A CN 109112257A
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CN
China
Prior art keywords
furnace
vacuum
hot rolling
temperature
mould steel
Prior art date
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Pending
Application number
CN201811298205.7A
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Chinese (zh)
Inventor
于泽平
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Foshan Shunde Zhong Heavy Metal Products Co Ltd
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Foshan Shunde Zhong Heavy Metal Products Co Ltd
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Priority to CN201811298205.7A priority Critical patent/CN109112257A/en
Publication of CN109112257A publication Critical patent/CN109112257A/en
Pending legal-status Critical Current

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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
    • C22C38/02—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
    • 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
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • 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
    • C21D1/32—Soft annealing, e.g. spheroidising
    • 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
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or 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
    • 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
    • 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
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • 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
    • C22C38/18—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

Abstract

The present invention relates to a kind of hot rolling mould steel, mass fraction is as follows: C:0.45-0.6%；Si:0.6-0.9%；Mn:1.0-1.1%；Cr:0.2-0.35%；Mo:1.4-1.45%；V:0.04-0.06%；P:0.02-0.035%；S:0.003-0.011%；Rare earth element: 0.001-0.01%；Remaining is iron and a small amount of impurity, manufacturing step are as follows: first melting-casts steel embryo-secondary smelting-vacuum purifies-and finished product-spheroidizing-vacuum hardening-vacuum tempering is made, rare earth element is added, and pass through vacuum purification, spheroidizing and vacuum high-temperature quenching and vacuum high-temperature tempering, the crystal grain of mould steel is refined, keep the metallographic structure of mould steel uniform, there is excellent Testing Tensile Strength at Elevated Temperature, high temperature abrasion resistance and hot-cracking resistance.

Description

A kind of hot rolling mould steel and its manufacturing method
Technical field
The present invention relates to mould steel manufacturing field, espespecially a kind of hot rolling mould steel and its manufacturing method.
Background technique
Mold is manufacturing important foundation technological equipment, and Tool and Die Technology level has become one national product manufacture of measurement The one of the important signs that of industry level, with the development of Chinese mold manufacturing industry, the development of China's mould steel is very rapid, mould steel Grades Series constantly improve, quality level and production technology equipment have significant progress, still, due to hot forged mould one As need to work under high temperature environment, therefore it is required that need to have excellent elevated temperature tensile strong for the steel of preparation the type mold Degree, high temperature abrasion resistance and hot-cracking resistance, the purity of existing hot rolling mould steel is not high, and metallographic structure is uneven, is adding repeatedly Hot and cold but during be easy to appear getting up early cracking with cracking the phenomenon that, service life is very short.
Summary of the invention
To solve the above problems, the present invention provides a kind of uniform metallographic structure, freedom from cracking and the good hot rolling mould of cracking behavior Have steel and its manufacturing method.
To achieve the above object, the present invention, which adopts the following technical scheme that, is: a kind of hot rolling mould steel, mass fraction is such as Under:
C:0.45-0.6%；
Si:0.6-0.9%；
Mn:1.0-1.1%；
Cr:0.2-0.35%；
Mo:1.4-1.45%；
V:0.04-0.06%；
P:0.02-0.035%；
S:0.003-0.011%；
Rare earth element: 0.001-0.01%；
Remaining is iron and a small amount of impurity.
Rare earth is exactly lanthanide series in the periodic table of chemical element -- lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), Samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu), Yi Jiyu Closely related element-the yttrium (Y) of 15 elements of group of the lanthanides and scandium (Sc) totally 17 kinds of elements, referred to as rare earth element.
A kind of manufacturing method of hot rolling mould steel, steps are as follows:
Steel is smelted into Step 1: C, Si, Mn, Cr, Mo, V, P, S, rare earth element and Fe are put into togerther in smelting furnace in proportion Water；
It is cast as steel ingot Step 2: molten steel is injected in mold, broadcasts sowing glass along first direction on the steel ingot that will be solidified Glass steel fibre, the steel fibre wavy along respective length direction；To which the face crack of steel slab be effectively reduced,
Secondary smelting is carried out Step 3: steel ingot is put into smelting furnace；
Step 4: carrying out vacuum purification processes；
Step 5: the steel ingot of step 4 is forged into finished product；
Step 6: carrying out spheroidizing processing to finished product；
Step 7: the finished product to step 6 carries out vacuum heat treatment,
Quenching treatment in vacuum drying oven is placed products into, hardening heat is 1300-1330 DEG C, is carried out for the first time after the completion of quenching Tempering adjusts in-furnace temperature to 630-650 DEG C, keeps the temperature 1-2h, cools to room temperature with the furnace, then be warming up to 600-630 DEG C, 1-2h is kept the temperature, second of tempering is carried out, finally cools to room temperature with the furnace, come out of the stove.
Preferably, in step 1, smelting temperature is 1580-1630 DEG C.
Preferably, in step 4, vacuum purification processes be successively after electric furnace, LF furnace and VD furnace Fruit storage, Free oxygen≤4ppm reduces the element that S, H, O or other are combined into gas, reduces the quantity of stomata.
Preferably, in step 7, finished product forms austenite grain after quenching treatment, to be greater than critical cooling rate Cooling, obtains martensitic structure, carries out double tempering after quenching, the tempered sorbite for being changed into retained austenite sufficiently obtains To stable tempered structure.
The beneficial effects of the present invention are: be added rare earth element, and by vacuum purification processes, spheroidizing processing and Vacuum high-temperature quenching and vacuum high-temperature tempering, have refined the crystal grain of mould steel, have kept the metallographic structure of mould steel uniform, have Excellent Testing Tensile Strength at Elevated Temperature, high temperature abrasion resistance and hot-cracking resistance, solves in mould steel use process and is cracked and opens in early days The problem of splitting.
Specific embodiment
For the present invention about a kind of hot rolling mould steel, mass fraction is as follows:
C:0.45-0.6%；
Si:0.6-0.9%；
Mn:1.0-1.1%；
Cr:0.2-0.35%；
Mo:1.4-1.45%；
V:0.04-0.06%；
P:0.02-0.035%；
S:0.003-0.011%；
Rare earth element: 0.001-0.01%；
Remaining is iron and a small amount of impurity.
Preferably, rare earth element selects the mixture of Eu or Gd or both.
A kind of manufacturing method of hot rolling mould steel, steps are as follows:
Step 1: C, Si, Mn, Cr, Mo, V, P, S, rare earth element and Fe are put into togerther in smelting furnace in proportion in 1580- Molten steel is smelted within the temperature range of 1630 DEG C；
Rare earth element is easy to generate high-melting-point rare earth oxide, rare-earth sulfide and rare earth sulphur oxygen in conjunction with S, O in steel Compound, these substances can be used as non-white hair crystallization nuclei during molten steel solidification, promote crystal grain refinement in steel.
Steel ingot is cast as Step 2: molten steel is injected in mold；
Secondary smelting is carried out Step 3: steel ingot is put into smelting furnace；
Step 4: carry out vacuum purification processes, using, by VD furnace vacuum deaeration, making freedom after electric furnace smelting and LF refining Oxygen≤4ppm reduces the element that S, H, O or other are combined into gas, can reduce the stomata quantity of finished product, make tissue more It is fine and close.；
Step 5: the steel ingot of step 4 is forged into finished product；
Step 6: carrying out spheroidizing processing to finished product；
Step 7: the finished product to step 6 carries out vacuum heat treatment,
Quenching treatment in vacuum drying oven is placed products into, hardening heat is 1300-1330 DEG C, is carried out for the first time after the completion of quenching Tempering adjusts in-furnace temperature to 630-650 DEG C, keeps the temperature 1-2h, cools to room temperature with the furnace, then be warming up to 600-630 DEG C, 1-2h is kept the temperature, second of tempering is carried out, finally cools to room temperature with the furnace, come out of the stove.
Preferably, in step 7, finished product forms austenite grain after quenching treatment, to be greater than critical cooling rate Cooling, obtains martensitic structure, carries out double tempering after quenching, the tempered sorbite for being changed into retained austenite sufficiently obtains To stable tempered structure, it is 55-58 that mechanical property, which is hardness HRC, tensile strength 1840MPa, and yield strength is 1560MPa, elongation 15%.
Embodiment of above be only preferred embodiments of the present invention will be described, not to the scope of the present invention into Row limits, and without departing from the spirit of the design of the present invention, this field ordinary engineering and technical personnel is to technical side of the invention The various changes and improvements that case is made, should fall within the scope of protection determined by the claims of the present invention.

Claims (5)

1. a kind of hot rolling mould steel, it is characterised in that: its mass fraction is as follows:
C:0.45-0.6%；
Si:0.6-0.9%；
Mn:1.0-1.1%；
Cr:0.2-0.35%；
Mo:1.4-1.45%；
V:0.04-0.06%；
P:0.02-0.035%；
S:0.003-0.011%；
Rare earth element: 0.001-0.01%；
Remaining is iron and a small amount of impurity.
2. a kind of manufacturing method of hot rolling mould steel according to claim 1, it is characterised in that: steps are as follows:
Molten steel is smelted into Step 1: C, Si, Mn, Cr, Mo, V, P, S, rare earth element and Fe are put into togerther in smelting furnace in proportion；
Steel ingot is cast as Step 2: molten steel is injected in mold；
Secondary smelting is carried out Step 3: steel ingot is put into smelting furnace；
Step 4: carrying out vacuum purification processes；
Step 5: the steel ingot of step 4 is forged into finished product；
Step 6: carrying out spheroidizing processing to finished product；
Step 7: the finished product to step 6 carries out vacuum heat treatment,
Quenching treatment in vacuum drying oven is placed products into, hardening heat is 1300-1330 DEG C, carries out first time tempering after the completion of quenching Processing, in-furnace temperature is adjusted to 630-650 DEG C, is kept the temperature 1-2h, is cooled to room temperature with the furnace, then be warming up to 600-630 DEG C, is kept the temperature 1-2h carries out second of tempering, finally cools to room temperature with the furnace, come out of the stove.
3. a kind of manufacturing method of hot rolling mould steel according to claim 2, it is characterised in that: in step 1, melting temperature Degree is 1580-1630 DEG C.
4. a kind of manufacturing method of hot rolling mould steel according to claim 2, it is characterised in that: in step 4, vacuum is mentioned Pure processing is successively after electric furnace, LF furnace and VD furnace Fruit storage, free oxygen≤4ppm reduces S, H, O or other It is combined into the element of gas, reduces the quantity of stomata.
5. a kind of manufacturing method of hot rolling mould steel according to claim 2, it is characterised in that: in step 7, finished product Austenite grain is formed after quenching treatment, is cooled down with being greater than critical cooling rate, is obtained martensitic structure, carried out after quenching Double tempering, the tempered sorbite for being changed into retained austenite sufficiently obtain stable tempered structure.
CN201811298205.7A 2018-11-02 2018-11-02 A kind of hot rolling mould steel and its manufacturing method Pending CN109112257A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109880987A (en) * 2019-01-24 2019-06-14 嘉善平盛热处理有限公司 A kind of martensitic stain less steel machine components heat-treatment processing process
CN110468341A (en) * 2019-08-13 2019-11-19 南京钢铁股份有限公司 A kind of 1400MPa grades of delayed fracture resistance high-strength bolt and manufacturing method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105112794A (en) * 2015-08-25 2015-12-02 石家庄钢铁有限责任公司 Low-cost plastic mold steel and production method thereof
CN107699789A (en) * 2017-08-24 2018-02-16 唐山志威科技有限公司 A kind of high tenacity, high thermal stability ZW866 hot die steel for die-casting and preparation method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105112794A (en) * 2015-08-25 2015-12-02 石家庄钢铁有限责任公司 Low-cost plastic mold steel and production method thereof
CN107699789A (en) * 2017-08-24 2018-02-16 唐山志威科技有限公司 A kind of high tenacity, high thermal stability ZW866 hot die steel for die-casting and preparation method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109880987A (en) * 2019-01-24 2019-06-14 嘉善平盛热处理有限公司 A kind of martensitic stain less steel machine components heat-treatment processing process
CN110468341A (en) * 2019-08-13 2019-11-19 南京钢铁股份有限公司 A kind of 1400MPa grades of delayed fracture resistance high-strength bolt and manufacturing method
CN110468341B (en) * 2019-08-13 2020-09-25 南京钢铁股份有限公司 1400 MPa-level delayed fracture-resistant high-strength bolt and manufacturing method thereof

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Application publication date: 20190101