CN115896615A - Sulfur-containing 37MnSiVSQ free-cutting non-quenched and tempered hot-rolled round steel and preparation method thereof - Google Patents
Sulfur-containing 37MnSiVSQ free-cutting non-quenched and tempered hot-rolled round steel and preparation method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 67
- 239000010959 steel Substances 0.000 title claims abstract description 67
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 35
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 239000011593 sulfur Substances 0.000 title claims abstract description 24
- 238000005520 cutting process Methods 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 16
- 229910052742 iron Inorganic materials 0.000 claims abstract description 14
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 14
- 239000000126 substance Substances 0.000 claims abstract description 13
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 11
- 229910052729 chemical element Inorganic materials 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000005096 rolling process Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 4
- 239000011574 phosphorus Substances 0.000 claims description 4
- 238000010583 slow cooling Methods 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 2
- 238000009749 continuous casting Methods 0.000 claims description 2
- 238000009659 non-destructive testing Methods 0.000 claims description 2
- 238000005498 polishing Methods 0.000 claims description 2
- 238000004321 preservation Methods 0.000 claims description 2
- 238000009628 steelmaking Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 2
- 229910045601 alloy Inorganic materials 0.000 description 12
- 239000000956 alloy Substances 0.000 description 12
- 229910052761 rare earth metal Inorganic materials 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000011651 chromium Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000011572 manganese Substances 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 238000005728 strengthening Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 150000002910 rare earth metals Chemical class 0.000 description 3
- 229910000954 Medium-carbon steel Inorganic materials 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000915 Free machining steel Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 229910000756 V alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000011326 mechanical measurement Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 150000004763 sulfides Chemical class 0.000 description 1
- 229910052714 tellurium Inorganic materials 0.000 description 1
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000009489 vacuum treatment Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Classifications
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- 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
Abstract
The invention discloses sulfur-containing 37MnSiVSQ free-cutting non-quenched and tempered hot-rolled round steel which comprises the following chemical components in percentage by weight: c:0.36-0.39%, mn:1.35-1.45%, si:0.65-0.70%, cr:0.10-0.15%, V:0.10-0.14%, N:0.013-0.018%, P: less than or equal to 0.020%, S:0.020-0.030 percent of RE, 0.0020-0.0040 percent of RE, and the balance of iron and inevitable trace chemical elements; its preparing process is also disclosed. The invention is rolled into round steel with the diameter of 50-120mm, and the yield strength is more than or equal to 580MPa; the tensile strength is more than or equal to 850MPa and less than or equal to 1000MPa; the surface shrinkage is more than or equal to 25; the elongation is more than or equal to 12; the impact energy Aku at room temperature is more than or equal to 25J; the surface hardness is 250-310HB.
Description
Technical Field
The invention relates to the field of material metallurgy, in particular to sulfur-containing 37MnSiVSQ free-cutting non-quenched and tempered hot-rolled round steel.
Background
The main power for the development of non-quenched and tempered steel is to greatly reduce the cost of the non-quenched and tempered steel. The non-quenched and tempered steel is characterized in that a small amount of microalloying elements are added into medium carbon steel, and the strength requirement of the medium carbon steel is met through precipitation strengthening. The method does not need valuable alloy elements such as chromium, molybdenum and the like for improving hardenability, and the alloy cost is obviously reduced; (2) the quenching and tempering heat treatment process is cancelled, so that the energy is saved; (3) the non-quenched and tempered steel finally obtains a ferrite-pearlite structure which is easier to machine than a tempered martensite structure, so that the machining performance is improved, and the machining cost of a workpiece is greatly reduced. At present, non-quenched and tempered steel has been widely used in the industries of machinery, automobiles and the like instead of the conventional quenched and tempered steel.
The document with the publication number of CN108118238A, a method for inhibiting the remanence value of a non-quenched and tempered steel rolled product. The method for controlling the remanence value of a non-quenched and tempered steel 35MnZSiV and 44MnS2 steel rolled product is provided, the medium-carbon non-quenched and tempered steel rolled product with the residual AS content of less than 65ppm can be prepared by controlling the molten iron with the AS content of less than 25ppm and the auxiliary material with the AS content of less than 30ppm, and further the remanence value of the end part of the medium-carbon non-quenched and tempered steel rolled product is controlled within 20Gs, but the method is not easy to control in actual production, and the production cost is increased.
Through search, the document with the publication number of CN107287504, the medium carbon free-cutting non-quenched and tempered steel containing sulfur and tellurium and the production process method thereof. The non-quenched and tempered steel mainly comprises the following components: 0.35 to 0.50 percent of C, 0.10 to 0.80 percent of Si, 0.75 to 1.60 percent of Mn, less than or equal to 0.03 percent of P, 0.02 to 0.08 percent of S, 0 to 0.08 percent of Mo, 0 to 0.025 percent of Nb, 0.02 to 0.12 percent of V, N:0.012 to 0.016 percent, te 0.02 to 0.08 percent, ca 0.001 to 0.003 percent, and the balance of iron and inevitable impurities. The alloy elements are more, the non-tempering performance is improved by alloy, and the production and manufacturing cost is increased.
The research shows that the publication number is CN109295391, a high-strength and high-toughness non-quenched and tempered steel and a preparation method thereof. The high-strength and high-toughness non-quenched and tempered steel comprises the following components in percentage by mass: c:0.23 to 0.27 percent; si:0.22 to 0.35 percent; mn:1.81 to 1.90 percent; cr:0.50 to 0.55 percent; s:0.045-0.06%; p: less than or equal to 0.02 percent; v:0.11 to 0.14 percent; n:0.025 to 0.040 percent, and the balance of iron and inevitable impurities. The Mn element content is too high, the strength is increased, the toughness and the plasticity are reduced, and the subsequent processing is not easy to realize.
Aiming at the defects in the patent documents, the invention provides a preparation method for producing the sulfur-containing 37MnSiVSQ free-cutting non-quenched and tempered hot-rolled round steel by micro-alloying.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide the sulfur-containing 37MnSiVSQ free-cutting non-quenched and tempered hot-rolled round steel and the preparation method thereof, the steel is rolled into round steel with the diameter of 50-120mm, and the yield strength of the steel is more than or equal to 580MPa; the tensile strength is more than or equal to 850MPa and less than or equal to 1000MPa; the surface shrinkage is more than or equal to 25; the elongation is more than or equal to 12; the impact energy Aku at room temperature is more than or equal to 25J; the surface hardness is 250-310HB.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a sulfur-containing 37MnSiVSQ free-cutting non-quenched and tempered hot-rolled round steel which comprises the following chemical components in percentage by weight: c:0.36-0.39%, mn:1.35-1.45%, si:0.65-0.70%, cr:0.10-0.15%, V:0.10-0.14%, N:0.013-0.018%, P: less than or equal to 0.020%, S:0.020-0.030 percent of iron, 0.0020-0.0040 percent of RE and the balance of iron and inevitable trace chemical elements.
Further, the chemical composition percentage requirement is as follows: c:0.37%, mn:1.40%, si:0.68%, cr:0.13%, V:0.12%, N:0.016%, P:0.012%, S:0.027 percent, 0.0022 percent of RE and the balance of iron and inevitable trace chemical elements.
Further, the chemical composition percentage requirement is as follows: c:0.38%, mn:1.40%, si:0.70%, cr:0.13%, V:0.10%, N:0.015%, P:0.012%, S:0.028 percent, 0.0025 percent of RE and the balance of iron and inevitable trace chemical elements.
Further, the chemical composition percentage requirement is as follows: c:0.37%, mn:1.42%, si:0.68%, cr:0.13%, V:0.09%, N:0.014%, P:0.013%, S:0.027 percent, 0.0024 percent of RE and the balance of iron and inevitable trace chemical elements.
A preparation method of sulfur-containing 37MnSiVSQ free-cutting non-quenched and tempered hot-rolled round steel comprises the following steelmaking process flows: converter-external refining-VD vacuum treatment-continuous casting and steel rolling process flow: heating a casting blank, removing phosphorus by high-pressure water, removing phosphorus by phi 850mm cogging mill, rolling by phi 700mm multiplied by 3+ phi 550mm multiplied by 4 continuous rolling unit, sawing, slow cooling, nondestructive testing, stacking, checking, polishing, bundling, warehousing and delivering; the technical parameters controlled in the rolling process are as follows:
1) The heating temperature is 1150-1200 ℃, and the heat preservation time is more than or equal to 2 hours;
2) The initial rolling temperature is less than or equal to 1080 ℃;
3) The finishing temperature is less than or equal to 780 ℃;
4) The slow cooling time is more than or equal to 48 hours.
The main chemical composition is limited by the following reasons:
c: c is the most effective element for improving the strength of the steel, the tensile strength and the yield strength of the steel are improved along with the increase of the content of C, but the elongation and the impact toughness are reduced, the corrosion resistance is also reduced, and the welding heat affected zone of the steel can also have a hardening phenomenon, so that the generation of welding cold cracks is caused. In order to ensure that the round steel obtains good comprehensive performance, the content of the C element in the steel is designed to be 0.36-0.39%.
Mn: mn is an important toughening element, the cost is low, the strength of the steel is obviously improved along with the increase of the content of manganese, the processing performance of the steel is improved, and the ductile-brittle transition temperature is hardly changed. However, too high manganese content may inhibit ferrite transformation, affect the yield strength of steel, and be detrimental to yield ratio control. The Mn element content of the steel is designed to be 1.35-1.45%.
Si: si can improve the strength of steel to a certain extent by adding Si element, but martensite structure is easily generated in the steel along with the further increase of the mass percent of Si, so the mass percent of Si of the sulfur-containing 37MnSiVSQ free-cutting hot-rolled round steel is controlled to be 0.65-0.70%.
V: v is an important precipitation strengthening element, about 0.1wt% of V is added, under the condition of not influencing ductility and toughness, precipitates in ferrite and austenite greatly improve the strength of the material, and the strengthening effect is not obvious due to the low content of V. When the mass percent of the added V is higher than 0.15%, the cost is increased, and the performance improvement effect on steel is not great, so that the mass percent of the V in the sulfur-containing 37MnSiVSQ free-cutting non-quenched and tempered hot-rolled round steel is 0.10-0.14%.
Cr: cr can improve the strength, hardness and atmospheric corrosion resistance of steel, and has obvious effect when other alloy elements are added. Chromium slows down the decomposition speed of austenite, remarkably improves the hardenability of steel, has a secondary hardening effect, and increases the temper brittleness tendency of steel. However, if the chromium content is too high, the toughness of the base material and the heat affected zone may be reduced. The Cr element content of the steel is designed to be 0.10-0.15%.
N: n and alloy elements such as V, ti and the like are easy to produce nitride or nitrogen carbide, the crystal grains are refined, and the strength and toughness of the steel are improved through precipitation strengthening; on the other hand, if the mass percentage of N in the steel is too high, void defects are likely to occur. According to the invention, the mass percent of N in the sulfur-containing 37MnSiVSQ free-cutting non-quenched and tempered hot-rolled round steel is limited to 0.013-0.018%.
S: s is an element that is hot-brittle and easy-to-cut, and it is known that the cutting workability improves as the mass percentage of sulfur increases, but the hot workability deteriorates as the sulfur content increases, so the mass percentage of S is not so large, and the upper limit of the mass percentage of S is controlled to 0.065% or less. Further, when the mass percentage of sulfur is less than 0.025%, the machinability cannot be exhibited. Therefore, the mass percent of N in the sulfur-containing 37MnSiVSQ free-cutting non-quenched and tempered hot-rolled round steel is limited to 0.020-0.030%.
RE is known to be a clean and significant deterioration in steel. The cleanliness of steel is continuously improved, and the microalloying effect of rare earth elements is increasingly prominent. Microalloying of rare earth includes solid solution strengthening of trace rare earth elements, interaction of rare earth elements with other solute elements and compounds, existence state (atoms, inclusions or compounds), size, morphology and distribution of rare earth elements, segregation particularly in grain boundaries, and influence of rare earth on steel surface and matrix structure. Therefore, the mass percentage of RE in the easy-cutting non-quenched and tempered hot-rolled round steel containing 37MnSiVSQ which is disclosed by the invention is limited to 0.0020-0.0040%.
Compared with the prior art, the invention has the beneficial technical effects that:
the innovation point of the invention is that the content of C element is reasonably controlled, alloy element is adopted for reinforcement, C, N and alloy element V are utilized to easily produce nitride or nitrogen carbide, crystal grains are refined, the toughness of steel is improved by precipitation reinforcement, the shape of sulfide is changed by the influence of RE element on the modification of inclusion, and the toughness of steel is improved.
The round steel has the following advantages:
1) VN alloy is adopted for smelting, so that the strength of the non-quenched and tempered free-cutting steel is improved, the consumption of V alloy is saved, and the cost can be reduced.
2) After VD vacuum treatment, VD alloy, feS alloy and other alloys are added to ensure the yield of N and S.
3) The trace rare earth elements are added, and the influence of the rare earth elements on the modification of the inclusions is utilized to change the form of sulfides and improve the toughness of steel.
Detailed Description
The present invention is further illustrated by the following specific examples, which are provided for illustrative purposes only and are not to be construed as limiting the scope of the present invention.
The invention is further described below:
table 1 is a table listing the chemical components and weight percent content of each example of the present invention,
table 2 is a table of the results of mechanical and toughness tests of the examples of the present invention.
Table 1 chemical compositions and weight percent of examples
| Examples | C | Si | Mn | P | S | N | V | RE | Cr |
| 1 | 0.37 | 0.68 | 1.40 | 0.012 | 0.027 | 0.016 | 0.12 | 0.0022 | 0.13 |
| 2 | 0.38 | 0.70 | 1.40 | 0.012 | 0.028 | 0.015 | 0.10 | 0.0025 | 0.13 |
| 3 | 0.37 | 0.68 | 1.42 | 0.013 | 0.027 | 0.014 | 0.09 | 0.0024 | 0.13 |
Table 2 shows the results of mechanical measurements and the like of the examples
As can be seen from the data in tables 1 and 2: the sulfur-containing 37MnSiVSQ free-cutting non-quenched and tempered hot-rolled round steel meets the technical requirements in terms of performance through VN alloying and rare earth microalloying. The sulfur-containing 37MnSiVSQ free-cutting hot-rolled round steel has simple chemical components, and has the advantages of simple control, low manufacturing cost, strong operability and the like aiming at the production of sulfur-containing free-cutting non-quenched and tempered steel.
The above-described embodiments are only intended to illustrate the preferred embodiments of the present invention, and not to limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (5)
1. The sulfur-containing 37MnSiVSQ free-cutting non-quenched and tempered hot-rolled round steel is characterized by comprising the following chemical components in percentage by weight: c:0.36-0.39%, mn:1.35-1.45%, si:0.65-0.70%, cr:0.10-0.15%, V:0.10-0.14%, N:0.013-0.018%, P: less than or equal to 0.020%, S:0.020-0.030 percent of iron, 0.0020-0.0040 percent of RE and the balance of iron and inevitable trace chemical elements.
2. The sulfur-containing 37MnSiVSQ free-cutting non-quenched and tempered hot-rolled round steel as claimed in claim 1, which is characterized by comprising the following chemical components in percentage by weight: c:0.37%, mn:1.40%, si:0.68%, cr:0.13%, V:0.12%, N:0.016%, P:0.012%, S:0.027 percent, 0.0022 percent of RE and the balance of iron and inevitable trace chemical elements.
3. The sulfur-containing 37MnSiVSQ free-cutting non-quenched and tempered hot-rolled round steel as claimed in claim 1, which is characterized by comprising the following chemical components in percentage by weight: c:0.38%, mn:1.40%, si:0.70%, cr:0.13%, V:0.10%, N:0.015%, P:0.012%, S:0.028 percent, 0.0025 percent of RE and the balance of iron and inevitable trace chemical elements.
4. The sulfur-containing 37MnSiVSQ free-cutting non-quenched and tempered hot-rolled round steel as claimed in claim 1, which is characterized by comprising the following chemical components in percentage by weight: c:0.37%, mn:1.42%, si:0.68%, cr:0.13%, V:0.09%, N:0.014%, P:0.013%, S:0.027%, RE 0.0024%, and the balance of iron and inevitable trace chemical elements.
5. The method for preparing the sulfur-containing 37MnSiVSQ free-cutting non-quenched and tempered hot-rolled round steel as claimed in any of claims 1 to 4, wherein the steel-making process flow is as follows: converter-external refining-VD vacuum treatment-continuous casting and steel rolling process flow: heating a casting blank, removing phosphorus by high-pressure water, removing phosphorus by phi 850mm cogging mill, rolling by phi 700mm multiplied by 3+ phi 550mm multiplied by 4 continuous rolling unit, sawing, slow cooling, nondestructive testing, stacking, checking, polishing, bundling, warehousing and delivering; the method is characterized in that: the technical parameters controlled in the rolling process are as follows:
1) The heating temperature is 1150-1200 ℃, and the heat preservation time is more than or equal to 2 hours;
2) The initial rolling temperature is less than or equal to 1080 ℃;
3) The finishing temperature is less than or equal to 780 ℃;
4) The slow cooling time is more than or equal to 48 hours.
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| CN116590596A (en) * | 2023-05-11 | 2023-08-15 | 包头钢铁（集团）有限责任公司 | Preparation method of non-quenched and tempered free-cutting F35VSRE hot-rolled round steel |
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| CN104046914A (en) * | 2013-09-26 | 2014-09-17 | 北大方正集团有限公司 | Non-quenched and non-tempered steel and production technology thereof |
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| CN105154774A (en) * | 2015-09-23 | 2015-12-16 | 宝山钢铁股份有限公司 | Free-cutting medium-carbon non-quenching and tempering steel for fracture splitting connecting rod and manufacturing method thereof |
| CN113293336A (en) * | 2021-04-13 | 2021-08-24 | 包头钢铁（集团）有限责任公司 | Preparation method of rare earth non-quenched and tempered free-cutting hot-rolled round steel with yield strength of 500MPa |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116590596A (en) * | 2023-05-11 | 2023-08-15 | 包头钢铁（集团）有限责任公司 | Preparation method of non-quenched and tempered free-cutting F35VSRE hot-rolled round steel |
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