CN110331338A - Non-hardened and tempered steel and its manufacturing method - Google Patents
Non-hardened and tempered steel and its manufacturing method Download PDFInfo
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- CN110331338A CN110331338A CN201910708095.5A CN201910708095A CN110331338A CN 110331338 A CN110331338 A CN 110331338A CN 201910708095 A CN201910708095 A CN 201910708095A CN 110331338 A CN110331338 A CN 110331338A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 83
- 239000010959 steel Substances 0.000 title claims abstract description 83
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 238000007670 refining Methods 0.000 claims abstract description 24
- 239000012535 impurity Substances 0.000 claims abstract description 16
- 238000003723 Smelting Methods 0.000 claims abstract description 13
- 230000008602 contraction Effects 0.000 claims abstract description 7
- 238000005266 casting Methods 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 238000005096 rolling process Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 8
- 229910052710 silicon Inorganic materials 0.000 abstract description 5
- 229910052804 chromium Inorganic materials 0.000 abstract description 4
- 229910052759 nickel Inorganic materials 0.000 abstract description 4
- 229910052802 copper Inorganic materials 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 16
- 239000011572 manganese Substances 0.000 description 15
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 14
- 239000010949 copper Substances 0.000 description 12
- 239000011651 chromium Substances 0.000 description 11
- 229910052799 carbon Inorganic materials 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 238000007689 inspection Methods 0.000 description 5
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 229910052748 manganese Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 208000037656 Respiratory Sounds Diseases 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- -1 (1) Substances 0.000 description 1
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000005087 graphitization Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 231100000241 scar Toxicity 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 210000003625 skull Anatomy 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
- C22C38/002—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
- C22C38/18—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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The present invention relates to a kind of non-hardened and tempered steel and its manufacturing methods, it includes the element of following content (wt.%): it be 0.15 ~ 0.35, Mn is 0.80 ~ 1.40 that C, which is 0.40 ~ 0.48, Si, Cr is 0.2 ~ 0.25, it be 0.2 ~ 0.25, Mo is 0.10 ~ 0.15 that V, which is 0.10 ~ 0.15, Ni, Cu is 0.2 ~ 0.25, P is that 0.03 ~ 0.035, S is 0.03 ~ 0.035, and surplus is Fe and inevitable impurity.Its manufacturing method includes: blast furnace smelting, electric furnace smelting, refining furnace refining, the refining of vacuum refining furnace negative pressure, continuously casting, rolling bar, WIRE FINISHING LINE and cooling.The tensile strength of non-hardened and tempered steel bar of the present invention is 750 ~ 900Mpa, yield strength >=520 Mpa, elongation after fracture >=17%, the contraction percentage of area >=35%, U-shaped ballistic work >=39J and not thermally treated surface hardness is 230-290HBW at 25 DEG C.
Description
Technical field
The present invention relates to a kind of non-hardened and tempered steel and its manufacturing methods, and the invention belongs to steel technical field of smelting.
Background technique
Non-hardened and tempered steel product directly cuts mainly for the manufacture of field of machining with component of rod category and axial workpiece,
In injection molding machine pull rod, engineering mechanical hydraulic oil cylinder piston rod, mine coal machine hydraulic support, electricity (wind) arbor, pump shaft, pin shaft etc.
Field, which achieves, to be widely applied.
Summary of the invention
An object of the present invention is to overcome the deficiencies in the prior art, provides a kind of tensile strength and yield strength
The high non-hardened and tempered steel of larger, elongation after fracture, the surface hardness not being heat-treated.
It is a further object of the present invention to provide a kind of manufacturing methods of non-hardened and tempered steel.
According to technical solution provided by the invention, the non-hardened and tempered steel, including the element of following content (wt.%): C is
It is 0.80~1.40, Cr be 0.2~0.25, V is 0.10~0.15, Ni 0.2 that 0.40~0.48, Si, which are 0.15~0.35, Mn,
It is 0.2~0.25, P be 0.03~0.035, S is 0.03~0.035 that~0.25, Mo, which are 0.10~0.15, Cu, surplus be Fe and
Inevitable impurity.
As preferred: the non-hardened and tempered steel includes the element of following content (wt.%): C 0.40, Si 0.15, Mn are
0.80, Cr 0.2, V 0.10, Ni 0.2, Mo 0.10, Cu 0.2, P 0.03, S 0.03, surplus are Fe and can not
The impurity avoided.
As preferred: the non-hardened and tempered steel includes the element of following content (wt.%): C 0.48, Si 0.35, Mn are
1.40, Cr 0.25, V 0.15, Ni 0.25, Mo 0.15, Cu 0.25, P 0.035, S 0.035, surplus be Fe and
Inevitable impurity.
As preferred: the non-hardened and tempered steel includes the element of following content (wt.%): C 0.45, Si 0.25, Mn are
1.10, Cr 0.22, V 0.13, Ni 0.23, Mo 0.13, Cu 0.23, P 0.032, S 0.032, surplus be Fe and
Inevitable impurity.
As preferred: the content (wt.%) of the inevitable impurity is less than 0.5.
A kind of manufacturing method of non-hardened and tempered steel is the following steps are included: blast furnace smelting, electric furnace smelting, refining furnace refining, vacuum
The refining of refining furnace negative pressure, continuously casting, rolling bar, WIRE FINISHING LINE and cooling；
In the non-hardened and tempered steel bar as made from the above method include following content (wt.%) element: C be 0.40~
0.48, Si be 0.15~0.35, Mn be 0.80~1.40, Cr be 0.2~0.25, V be 0.10~0.15, Ni is 0.2~0.25,
It is 0.2~0.25, P be 0.03~0.035, S is 0.03~0.035 that Mo, which is 0.10~0.15, Cu, and surplus is Fe and inevitable
Impurity；
The tensile strength of non-hardened and tempered steel bar as made from the above method be 750~900Mpa, yield strength >=
520Mpa, elongation after fracture >=17%, the contraction percentage of area >=35%, U-shaped ballistic work >=39J and surface hardness are 230- at 25 DEG C
290HBW。
The tensile strength of non-hardened and tempered steel of the invention be 750~900Mpa, yield strength >=520Mpa, elongation after fracture >=
17%, the contraction percentage of area >=35%, U-shaped ballistic work >=39J and not thermally treated surface hardness are 230-290HBW at 25 DEG C.
Detailed description of the invention
Fig. 1 is the metallograph of non-hardened and tempered steel bar core made from embodiment 1.
Specific embodiment
The present invention is further explained in the light of specific embodiments.
Embodiment 1
Pass through blast furnace smelting, electric furnace smelting, refining furnace refining, the refining of vacuum refining furnace negative pressure, continuously casting, rolled bar
System, WIRE FINISHING LINE and cooling step obtain the element that the non-hardened and tempered steel bar that diameter is 40mm includes following content (wt.%): C
It is for 0.40, Si 0.15, Mn 0.80, Cr 0.2, V 0.10, Ni 0.2, Mo 0.10, Cu 0.2, P 0.03, S
0.03, inevitable impurity is 0.4, surplus Fe.
The mechanical property of non-hardened and tempered steel bar made from embodiment 1 is as follows: tensile strength (Rm) is 750~800Mpa, bends
Take intensity (Rel) >=520Mpa, elongation after fracture (A) >=17%, the contraction percentage of area (Z) >=35%, U-shaped ballistic work at 25 DEG C
(KU2) >=39J and without heat treatment table surface hardness be 230~250HBW.
It stretches and impact is respectively according to longitudinal mechanics of GB/T228, GB/T229 prescriptive procedure inspection steel rolled condition
Performance.
As can be seen from Figure 1: non-hardened and tempered steel bar is evenly distributed with the ferrite and pearlite of proper proportion, so that
The mechanical property of non-hardened and tempered steel bar is uniform, non-hardened and tempered steel bar under intensity with higher simultaneously it is with higher tough
Property, it is very suitable to the piston rod of production oil cylinder.
Embodiment 2
Pass through blast furnace smelting, electric furnace smelting, refining furnace refining, the refining of vacuum refining furnace negative pressure, continuously casting, rolled bar
System, WIRE FINISHING LINE and cooling step obtain the element that the non-hardened and tempered steel bar that diameter is 100mm includes following content (wt.%): C
It is for 0.48, Si 0.35, Mn 1.40, Cr 0.25, V 0.15, Ni 0.25, Mo 0.15, Cu 0.25, P
0.035, S 0.035, inevitable impurity is 0.35, surplus Fe.
The tensile strength (Rm) of non-hardened and tempered steel bar made from embodiment 2 be 800~850Mpa, yield strength (Rel) >=
520Mpa, elongation after fracture (A) >=17%, the contraction percentage of area (Z) >=35%, U-shaped ballistic work (KU2) >=39J and table at 25 DEG C
Surface hardness is 250-270HBW.
Embodiment 3
Pass through blast furnace smelting, electric furnace smelting, refining furnace refining, the refining of vacuum refining furnace negative pressure, continuously casting, rolled bar
System, WIRE FINISHING LINE and cooling step obtain the element that the non-hardened and tempered steel bar that diameter is 140mm includes following content (wt.%): C
It is for 0.45, Si 0.25, Mn 1.10, Cr 0.22, V 0.13, Ni 0.23, Mo 0.13, Cu 0.23, P
0.032, S 0.032, inevitable impurity is 0.25, surplus Fe.
The tensile strength (Rm) of non-hardened and tempered steel bar made from embodiment 3 be 850~900Mpa, yield strength (Rel) >=
520Mpa, elongation after fracture (A) >=17%, the contraction percentage of area (Z) >=35%, U-shaped ballistic work (KU2) >=39J and table at 25 DEG C
Surface hardness is 270~290HBW.
1. in the present invention, effect of each alloying element in non-hardened and tempered steel is as follows:
1.1, carbon: carbon is the essential element in steel.(1), when content in a certain range when, to steel have very big reinforcing
Effect improves intensity, hardness and wearability；(2), expand the element of austenitic area；(3), carbon and other alloying elements is common
Effect, improves the correlated performance of steel.
1.2, effect of the silicon in steel: (1), in raising steel the intensity and cold work hardening degree of solid solution make the toughness of steel
It is reduced with plasticity.(2), silicon can improve the elastic limit, yield limit and yield tensile ratio of steel significantly.(3), corrosion resistance.Silicon is
Good acid resisting material.When steel containing silicon heats in oxidizing atmosphere, surface will also form one layer of SiO film, to improve
The inoxidizability of steel at high temperature.
1.3, effect of the manganese in steel, (1), manganese can improve the harden ability of steel.(2), manganese is to raising low-carbon and middle carbon pearly-lustre
The intensity of body steel has obvious action.(3), manganese increases to the high-temperature instantaneous intensity of steel.
1.4, the intensity and hardness of steel can be improved in effect of the chromium in steel, (1) chromium.(2) high-temperature machinery of steel can be improved in chromium
Performance.(3) make steel that there is good corrosion resistance and inoxidizability.(4) graphitization is prevented.(5) harden ability is improved.
1.5, effect of the vanadium in steel, (1) heat resistance.(2) vanadium can improve the welding of common low carbon low-alloy steel significantly
Performance.
1.6, the intensity of steel can be improved without significantly reducing its toughness in effect of the nickel in steel, (1).(2) nickel can reduce steel
Brittle transition temperature, that is, the low-temperature flexibility of steel can be improved.(3) improve the processability and solderability of steel.(4) steel can be improved in nickel
Resistance to corrosion, can not only be acidproof, and can alkali resistant and atmosphere corrosion.
1.7, effect of the molybdenum in steel, (1) molybdenum have solution strengthening effect to ferrite.(2) steel heat resistance is improved.(3) resist
The effect of hydrogen attack.(4) harden ability of steel is improved.
1.8, effect of the copper in steel, Cu facilitate the increase of non-modulation hardness of steel, Cu content as solution strengthening element
When excessively high, exist and be easy to produce fire check, be easy bainite tissue so as to cause fracture segmentation property and machinability deterioration
The case where.It is unobvious to the increase effect of non-modulation hardness of steel when Cu content is too low.
1.9, effect of the phosphorus in steel, P make the reduction of the ductility and toughness of ferrite and pearlite, ductility and toughness
Reduce amount of plastic deformation, the good fracture separation of realization having the effect of near plane of disruption when reducing fracture.If contained
There is excessive P, then hot ductility reduces sometimes, and crackle or flaw are easy to produce in hot-working.
1.10, effect of the sulphur in steel, S form Mn sulfide in conjunction with Mn.When cracking steel, cracking is along to rolling
The Mn sulfide that direction processed extends is propagated, therefore containing for S has the bumps for increasing the plane of disruption, prevents in plane of disruption engagement
The effect only to misplace.If containing excess S, the amount of plastic deformation near plane of disruption when cracking sometimes increases, fracture separation
Property reduce.In addition, hot ductility reduces sometimes, and in hot-working, crackle or flaw become easy generation if excessive contain S.
2, the macrostructure of non-hardened and tempered steel bar of the invention meets claimed below:
In the cross section acidleach macrostructure test piece of 2.1 non-hardened and tempered steel bars, split without visual visible shrinkage cavity, intergranular
Line bubble, crackle, is mingled with, is layered, skull patch and white point.
2.2 require according to GB/T1979, grade to acidleach macrostructure test piece, rank should meet the regulation of table 1.
Table 1
| Center porosity | General Loosen | Pattern segregation | Center segregation |
| ≤ 2 grades | ≤ 2 grades | ≤ 2 grades | ≤ 1.5 grades |
3. the non-metallic inclusion of non-hardened and tempered steel bar of the invention meets claimed below:
It grades by GB/T10561-2005A method, qualified rank should meet the regulation of table 2.
Table 2
4. the grain size of non-hardened and tempered steel bar of the invention meets claimed below:
By GB/T6394 requirement, using the prior austenite grain size of directly etching method measurement non-hardened and tempered steel bar, qualified rank
Not less than 7 grades.
5. the surface quality of non-hardened and tempered steel bar of the invention meets: Surface of Rod Bar quality is processed by GB/T15712
Flawless, scar etc. use upper injurous defect afterwards.
6. the tower-shaped test of non-hardened and tempered steel bar of the invention
Tower-shaped hairline inspection carried out to non-hardened and tempered steel bar, each sample hairline total number≤7, hairline maximum length≤
8mm, hairline total length≤35mm, every step hairline item number≤5, every step hairline total length≤20mm, hairline start length
≥3mm.The tower-shaped inspection of steel allows using magnetic powder detection.
7. the ultrasonic inspection of non-hardened and tempered steel bar of the invention
Whole 100% ultrasonic inspection of branch of bar, rank of detecting a flaw are as follows: GB/T4162A grades.
Claims (6)
1. a kind of non-hardened and tempered steel, it is characterized in that the element comprising following content (wt.%): C be 0.40 ~ 0.48, Si be 0.15 ~
0.35, Mn be 0.80 ~ 1.40, Cr be 0.2 ~ 0.25, V be 0.10 ~ 0.15, Ni be 0.2 ~ 0.25, Mo is that 0.10 ~ 0.15, Cu is
0.2 ~ 0.25, P are that 0.03 ~ 0.035, S is 0.03 ~ 0.035, and surplus is Fe and inevitable impurity.
2. non-hardened and tempered steel as described in claim 1, it is characterized in that: the non-hardened and tempered steel includes the member of following content (wt.%)
Element: C 0.40, Si 0.15, Mn 0.80, Cr 0.2, V 0.10, Ni 0.2, Mo 0.10, Cu 0.2, P are
0.03, S 0.03, surplus is Fe and inevitable impurity.
3. non-hardened and tempered steel as described in claim 1, it is characterized in that: the non-hardened and tempered steel includes the member of following content (wt.%)
Element: C 0.48, Si 0.35, Mn 1.40, Cr 0.25, V 0.15, Ni 0.25, Mo 0.15, Cu 0.25, P are
0.035, S 0.035, surplus is Fe and inevitable impurity.
4. non-hardened and tempered steel as described in claim 1, it is characterized in that: the non-hardened and tempered steel includes the member of following content (wt.%)
Element: C 0.45, Si 0.25, Mn 1.10, Cr 0.22, V 0.13, Ni 0.23, Mo 0.13, Cu 0.23, P are
0.032, S 0.032, surplus is Fe and inevitable impurity.
5. the non-hardened and tempered steel as described in claim 1 ~ 4, it is characterized in that: the content (wt.%) of the inevitable impurity is less than
0.5。
6. a kind of manufacturing method of non-hardened and tempered steel, it is characterized in that the following steps are included: blast furnace smelting, electric furnace smelting, refining furnace are smart
Refining, the refining of vacuum refining furnace negative pressure, continuously casting, rolling bar, WIRE FINISHING LINE and cooling；
Include the element of following content (wt.%) in the non-hardened and tempered steel bar as made from the above method: C is 0.40 ~ 0.48, Si
For 0.15 ~ 0.35, Mn be 0.80 ~ 1.40, Cr be 0.2 ~ 0.25, V be 0.10 ~ 0.15, Ni be 0.2 ~ 0.25, Mo be 0.10 ~
0.15, Cu be 0.2 ~ 0.25, P be 0.03 ~ 0.035, S is 0.03 ~ 0.035, and surplus is Fe and inevitable impurity；
The tensile strength of non-hardened and tempered steel bar as made from the above method is 750 ~ 900Mpa, yield strength >=520 Mpa, breaks
Elongation >=17%, the contraction percentage of area >=35%, U-shaped ballistic work >=39J and not thermally treated surface hardness is at 25 DEG C afterwards
230-290HBW。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910708095.5A CN110331338A (en) | 2019-08-01 | 2019-08-01 | Non-hardened and tempered steel and its manufacturing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910708095.5A CN110331338A (en) | 2019-08-01 | 2019-08-01 | Non-hardened and tempered steel and its manufacturing method |
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| Publication Number | Publication Date |
|---|---|
| CN110331338A true CN110331338A (en) | 2019-10-15 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102363210A (en) * | 2011-10-27 | 2012-02-29 | 南京钢铁股份有限公司 | Production process for 48MnV round steel |
| CN103589970A (en) * | 2013-10-24 | 2014-02-19 | 南京钢铁股份有限公司 | Bar material for non-quenched and tempered shaft part and manufacturing process of bar material |
-
2019
- 2019-08-01 CN CN201910708095.5A patent/CN110331338A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102363210A (en) * | 2011-10-27 | 2012-02-29 | 南京钢铁股份有限公司 | Production process for 48MnV round steel |
| CN103589970A (en) * | 2013-10-24 | 2014-02-19 | 南京钢铁股份有限公司 | Bar material for non-quenched and tempered shaft part and manufacturing process of bar material |
Non-Patent Citations (1)
| Title |
|---|
| 董成瑞等编著: "《微合金非调质钢》", 31 January 2000, 冶金工业出版社 * |
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