CN106521316B - Carbon and low-alloy round steel and its manufacturing method in a kind of fastener high-hardenability - Google Patents

Carbon and low-alloy round steel and its manufacturing method in a kind of fastener high-hardenability Download PDF

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CN106521316B
CN106521316B CN201611003436.1A CN201611003436A CN106521316B CN 106521316 B CN106521316 B CN 106521316B CN 201611003436 A CN201611003436 A CN 201611003436A CN 106521316 B CN106521316 B CN 106521316B
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round steel
quenching
steel
temperature
fastener
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CN106521316A (en
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冀鸰
许晓红
胡绍鑫
邵淑艳
孔祥伟
朱云海
聂爱诚
黄镇
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Jiangyin Xingcheng Special Steel Works Co Ltd
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Jiangyin Xingcheng Special Steel Works Co Ltd
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Priority to PCT/CN2017/096705 priority patent/WO2018090682A1/en
Priority to US16/349,969 priority patent/US20190284654A1/en
Priority to EP17871507.4A priority patent/EP3505652A4/en
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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
    • C22C38/18—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
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0093—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for screws; for bolts
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

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  • Physics & Mathematics (AREA)
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  • Crystallography & Structural Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
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  • Heat Treatment Of Steel (AREA)

Abstract

The present invention relates to carbon and low-alloy round steel in fastener high-hardenability, chemical composition is C by mass percentage：0.36~0.44%, Si：0.15~0.40%, Mn：0.80~1.00%, Cr：1.00~1.15%, Mo：0.05~0.25%, Ni：0.05~0.25%, Cu：0.05~0.25%, Al：0.015~0.050%, B:0.0010~0.0050%, Ti：0.020~0.050%, surplus Fe；Round steel diameter is up to 65mm.Production procedure：Ti lines and ferro-boron are fed in converter smelting, LF refining, RH/VD degassings, and continuous casting rolls into bar, and conditioned processing obtains quenched round steel；Round steel after quenched can be directly used for processing and meet the fasteners such as 898 1 standards of ISO, 10.9 rank bolt.

Description

Carbon and low-alloy round steel and its manufacturing method in a kind of fastener high-hardenability
Technical field
The invention belongs to extraordinary round steel manufacturing technology fields, and in particular to can meet the fastening of 65mm specifications after one kind is conditioned The middle carbon and low-alloy round steel and its manufacturing method of the high-hardenability of part mechanical property requirements.
Background technology
Fastener products currently on the market are mostly all in accordance with ISO898-1：Fastener mechanical performance-bolt, screw and spiral shell Column requires to be produced, and table 3 proposes very strict requirement to the machinery and physical property of fastener in the standard, therein Difficult point has：1. core martensitic structure need to reach 90% or more to steel after quenching；2. each intensity rank is strong, hardness model meeting On the basis of enclosing, difference≤30HV of surface and core vickers hardness hv 0.3 is also needed to meet；3. using with stretch section as 75% fastening The mechanical performance index such as the integrally stretching test check intensity of part diameter, elongation percentage, the contraction percentage of area, 4. meet it is high-level strong On the basis of degree, plasticity index, meet -20 DEG C of Impact energy Ak v2 >=27J.This requires the steel of production fastener to have well Hardenability, quenching when can obtain enough depths of hardening zone, it is ensured that ratio of martensite, to ensure the group of final products It knits, uniformity of hardness is matched with obdurability.Fastener products specification is bigger, requires the hardenability of steel higher, production hardly possible Degree is also bigger.Currently, the steel such as generally use 32CrB4 or 42CrMo produce 45mm or less specification fasteners, right >=45mm specifications Fastener products, the steel such as the precious metals content such as generally use Mo, Ni higher 40CrNiMo, 4140MOD, otherwise cannot be satisfied Core quenching structure, transverse section hardness distribution and obdurability matching require.
Invention content
The technical problem to be solved by the present invention is to require in view of the above technology, carbon and low-alloy in a kind of CrB classes is provided and is justified Steel replaces the steel such as 40CrNiMo, 34CrNiMo6 of high Mo, high Ni, can produce maximum specification and can reach 65mm, mechanical performance Meet the fastener of ISO 898-1 standards, the purpose that cost of implementation reduces.
Technical solution is used by the present invention solves the above problems：Carbon and low-alloy is justified in a kind of fastener high-hardenability Steel, it is characterised in that：The chemical composition of the round steel is C by mass percentage：0.36~0.44%, Si：0.15~0.40%, Mn：0.80~1.00%, Cr：1.00~1.15%, Mo：0.05~0.25%, Ni：0.05~0.25%, Cu：0.05~0.25%, Al：0.015~0.050%, B:0.0010~0.0050%, Ti：0.020~0.050%, surplus is Fe and inevitable impurity Element.The diameter of round steel is up to 65mm, after modifier treatment mechanical tissue and performance meet ISO 898-1 standards require and it is other 10.9 grades of fastener requirements in equivalent standard：Quenching state martensitic structure content >=90%, takes tensile sample to examine after quenched, examination The 75% of a diameter of nominal size of sample stretch section, yield strength Rp0.2 >=940MPa of round steel, tensile strength Rm satisfactions 1040~ 1140MPa ranges, elongation percentage >=9%, the contraction percentage of area >=48% take Akv2 impact specimens, -20 DEG C of Charpy at half radius Ballistic work >=27J, within round steel total cross-section HV0.3 320~380HV of hardness, total cross-section nonhomogeneous hardness 30HV.
What the chemical composition of round steel of the present invention was related such that:
C：Increase material quenching degree, intensity and hardness, but reduce plasticity and toughness, increases ductile-brittle transition temperature, the present invention The carbon content in.It is 0.36~0.44% that the present invention, which controls its content,.
Si：It is the deoxidant element in steel, and improves the intensity of steel with solution strengthening form.When Si contents are less than 0.10%, Deoxidation effect is poor, and Si contents reduce toughness when higher.Si contents control of the present invention is 0.15~0.40%.
Mn：It is to improve the element of steel hardenability, and play the intensity that solution strengthening effect improves steel.But excessive Mn easily drops Low steel modeling, toughness, in order to reach the matching of intensity, plasticity, toughness, Mn contents control of the present invention is 0.80~1.00%.
Cr、Mo：Increase material quenching degree and obdurability, Mo also has reduction ductile-brittle transition temperature, inhibits temper brittleness, carry The effects that high-carbon, niobium nitride precipitation strength effect inhibit granular ferrite, P are hindered to be segregated, but Mo belongs to noble metal, additive amount It is excessively high to draw high manufacturing cost, therefore, the present invention controls Cr contents in the control of 1.00~1.15%, Mo contents 0.05~ 0.25%。
Ni：It is to improve the quenching degree of steel and can significantly improve the element of its low-temperature flexibility, On Impact Toughness and crisp turn tough Temperature has desirable influence.In addition, Ni is also precious metal, too high levels can increase cost.Consider, the present invention Ni contents are controlled 0.05~0.25%, are conducive to the cost performance being optimal.
Cu：The quenching degree of steel can be improved.But excessively high Cu contents are also easy to produce copper brittleness phenomenon, deteriorate the superficiality of steel Can, Cu contents of the present invention are 0.05~0.25%.
B：Be improve steel quenching degree element the most significant, played in patent of the present invention instead of precious metal Mo, The important function of Ni, to which cost of implementation reduces, B content control is 0.0010~0.0050% in patent of the present invention.
Ti：Nitrogen fixation is mainly played, Ti is combined early period in continuous casting billet solidification with N, and TiN particles are formed in intra-die, from And reacting for B and N is reduced, the effect that B improves quenching degree is given full play to, content is controlled 0.020~0.050%.
Al：Mainly play fixed nitrogen and deoxidation.Al combined with N the AlN to be formed can effectively crystal grain thinning, but contain Measure it is excessively high can damage the toughness of steel, and deteriorate molten steel opourability, Alt contents control of the present invention is in 0.015-0.050%.
It is a further object of the present invention to provide the manufacturing methods of carbon and low-alloy round steel in above-mentioned fastener high-hardenability：Work Skill step is that raw materials for metallurgy produces molten steel through converter smelting or electric furnace smelting, LF refining, RH degassings or VD degassings successively, essence Ti lines and ferro-boron are fed after refining；Molten steel, at continuous casting billet, is connected using 15~40 DEG C of low overheat whole process argon for protecting pouring Strand send or enters burial pit slow cooling 32 hours or more through 300~600 DEG C of temperature, goes out hole；Continuous casting billet is heated to 1200~1250 DEG C, Heat preservation 3~10 hours, comes out of the stove；Open rolling within the temperature range of 1100~1150 DEG C, rolls into round steel bar after high-pressure water descaling； Bar directly carries out continuous oven modifier treatment and obtains quenched round steel；Round steel after quenched can be directly used for processing and meet ISO 898- The fasteners such as 1 standard, 10.9 rank bolt.
Above-mentioned hardening and tempering process includes quenching and tempering, can be carried out on roller-bottom type continuous oven or the line of induction, on the stove of roller bottom When progress, quenching temperature is 840~880 DEG C, and time inside furnace is 60~360min, uses quenching ring water quenching；Tempering heating Temperature is 530~620 DEG C, and time inside furnace is 300~600min, air-cooled after coming out of the stove or water cooling to room temperature；It is carried out on the line of induction When, quenching temperature is 880~950 DEG C, and time inside furnace is 3~10min, uses quenching ring water quenching；Tempering heating-up temperature is 600~700 DEG C, time inside furnace is 3~10min, air-cooled after coming out of the stove or water cooling to room temperature.
Compared with the prior art, the advantages of the present invention are as follows：It is expensive instead of part using minimal amount of alloying element B and Ti Heavy metal elements Mo, Ni improve rod iron quenching degree, and production maximum gauge ensureing to meet up to the fastener products of 65mm 90% or more quenched martensite of steel core in ISO 898-1 standards, 0.3 difference of total cross-section vickers hardness hv≤30HV, -20 DEG C On the basis of the machinery such as Impact energy Ak v2 >=27J and physical property requirements, the production cost of product alloy raw material is significantly reduced.
Description of the drawings
Fig. 1 is quenching+tempering state core tissue in the embodiment of the present invention 1（100×）；
Fig. 2 is quenching+tempering state core tissue in the embodiment of the present invention 2（100×）；
Fig. 3 is quenching+tempering state core tissue in the embodiment of the present invention 3（100×）.
Specific implementation mode
Below in conjunction with attached drawing embodiment, present invention is further described in detail.
Embodiment 1
The a diameter of 64mm of steel for fastener that the present embodiment is related to, is heat-treated by 10.9 grades of fastener requirements, is changed It studies and point is by mass percentage：C：0.42%, Si：0.25%, Mn：0.95%, Cr：1.10%, Mo：0.10%, Ni：0.12, Cu：0.12%, Al：0.018%,B:0.0020%,Ti：0.025%, surplus is iron and inevitable impurity element.
Technological process：Body material produces molten steel through electric furnace smelting, LF refining, VD degassings successively, is fed after refining Enter titanium wire and ferro-boron；Molten steel is using 15~30 DEG C of low overheat whole process argon for protecting pouring at continuous casting billet, continuous casting billet slow cooling 32 Hour；Continuous casting billet is heated to 1250 DEG C, heat preservation is come out of the stove for 4 hours；Open rolling at a temperature of 1150 DEG C, rolls after high-pressure water descaling At round steel bar；Bar is quenched after 840 DEG C/3 hours austenitizings using high pressure water quenching ring in Continuous Roller bottom stove, then is passed through It spends 620 DEG C/6 hours and is tempered, it is air-cooled after coming out of the stove, with the 40CrNiMo steel for manufacturing big specification fastener conventional use of at present Ingredient, mechanical property and metallographic structure comparison such as table 1, table 2 and Fig. 1, it can be seen that the present embodiment Mo, Ni content substantially reduces, The few mechanical performance simultaneously of precious metal addition, transverse section hardness distribution and core metallographic structure meet ISO 898-1 standards It is required that.
CrB medium carbon steel ingredient and the ingredient of 1 round steel of comparative example can compare in 1 embodiment 1 of table（wt%）
C Si Mn Cr Mo Ni Cu Al Ti B
Comparative example 1 0.40 0.25 0.70 0.78 0.18 1.30 0.03 0.022 0.003 0.0001
Embodiment 1 0.42 0.25 0.95 1.10 0.10 0.12 0.12 0.018 0.025 0.0020
Performance is compared with 1 round steel of comparative example after table 2 embodiment, 1 bar is quenched
※ is using whole Specimen Determination tensile property；Cross section Vickers hardness maximum value-minimum value≤30HV.
Embodiment 2
The a diameter of 54mm of steel for fastener that the present embodiment is related to, is heat-treated by 10.9 grades of fastener requirements, is changed It studies and point is by mass percentage：C：0.37%, Si：0.22%, Mn：0.95%, Cr：1.10%, Mo：0.08%, Ni：0.10, Cu：0.10%, Al：0.022%,B:0.0023%,Ti：0.028%, surplus is iron and inevitable impurity element.
Above-mentioned round steel produces molten steel through electric furnace smelting, LF refining, VD degassings successively, and titanium wire and boron are fed after refining Iron；For molten steel using 15~30 DEG C of low overheat whole process argon for protecting pouring at continuous casting billet, 400 DEG C of temperature of continuous casting billet send heating；It will Continuous casting billet is heated to 1200 DEG C, and heat preservation is come out of the stove for 4 hours；Open rolling within the temperature range of 1100 DEG C, rolls into after high-pressure water descaling Round steel bar；Bar is quenched after 880 DEG C/5 minutes austenitizings using quenching ring in the line of induction, then is passed through in the stove of roller bottom It is tempered within 550 DEG C/5 hours, air-cooled after coming out of the stove, ingredient, mechanical property and metallographic group with current conventional use of 40CrNiMo steel Knit comparison such as table 3, table 4 and Fig. 2, it can be seen that the present embodiment Mo, Ni content substantially reduces, while mechanical performance, transverse section hardness Distribution and core metallographic structure meet the requirement of ISO 898-1 standards.
CrB medium carbon steel ingredient and the ingredient of 2 round steel of comparative example compare in 3 embodiment 2 of table（wt%）
C Si Mn Cr Mo Ni Cu Al Ti B
Comparative example 2 0.41 0.23 0.72 0.80 0.18 1.31 0.05 0.028 0.003 0.0001
Embodiment 2 0.37 0.22 0.95 1.10 0.08 0.10 0.10 0.022 0.028 0.0023
Performance is compared with 2 round steel of comparative example after table 4 embodiment, 2 bars are quenched
※ is using whole Specimen Determination tensile property；Cross section Vickers hardness maximum value-minimum value≤30HV.
Embodiment 3
The a diameter of 48mm of steel for fastener that the present embodiment is related to, is heat-treated by 8.8 grades of fastener requirements, chemistry Ingredient is by mass percentage：C：0.36%, Si：0.21%, Mn：0.92%, Cr：1.08%, Mo：0.08%, Ni：0.06, Cu： 0.08%, Al：0.023%,B:0.0025%,Ti：0.026%, surplus is iron and inevitable impurity element.
Above-mentioned round steel produces molten steel through KR pretreatments, converter smelting, LF refining, RH degassings successively, is fed after refining Enter titanium wire and ferro-boron；Molten steel is using 15~30 DEG C of low overheat whole process argon for protecting pouring at continuous casting billet, 400 DEG C of temperature of continuous casting billet Send heating；Continuous casting billet is heated to 1200 DEG C, heat preservation is come out of the stove for 4 hours；After high-pressure water descaling within the temperature range of 1100 DEG C Open rolling rolls into round steel bar；Bar is quenched after 950 DEG C/4 minutes austenitizings using quenching ring on the continous way line of induction, It was tempered using 700 DEG C/4 minutes, air-cooled after coming out of the stove, ingredient, mechanical property and gold with current conventional use of 4140MOD steel Phase constitution comparison such as table 5, table 6 and Fig. 3, it can be seen that the present embodiment Mo, Ni content substantially reduces, while mechanical performance, cross section Hardness is distributed and core metallographic structure meets the requirement of ISO 898-1 standards.
CrB medium carbon steel ingredient and the ingredient of 40CrNiMo round steel can compare in 5 embodiment 3 of table（wt%）
C Si Mn Cr Mo Ni Cu Al Ti B
Comparative example 3 0.41 0.25 0.95 1.05 0.23 1.31 0.05 0.028 0.003 0.0001
Embodiment 3 0.36 0.21 0.92 1.08 0.08 0.06 0.08 0.023 0.026 0.0025
Performance is compared with 40CrNiMo round steel after table 6 embodiment, 3 bars are quenched
※ is using whole Specimen Determination tensile property；Cross section Vickers hardness maximum value-minimum value≤30HV.
In addition to the implementation, all to use equivalent transformation or equivalent replacement the invention also includes there is an other embodiment The technical solution that mode is formed should all be fallen within the scope of the hereto appended claims.

Claims (2)

1. carbon and low-alloy round steel in a kind of fastener high-hardenability, it is characterised in that：The chemical composition of the round steel presses quality hundred Ratio is divided to be calculated as C：0.36~0.44%, Si：0.15~0.40%, Mn：0.80~1.00%, Cr：1.00~1.15%, Mo：0.05~ 0.25%, Ni：0.05~0.25%, Cu：0.05~0.25%, Al：0.015~0.050%, B:0.0010~0.0050%, Ti： 0.020~0.050%, surplus is Fe and inevitable impurity element；
The diameter of round steel is up to 65mm, after modifier treatment mechanical tissue and performance meet ISO 898-1 standards require and it is other 10.9 grades of fastener requirements in equivalent standard：Quenching state martensitic structure content >=90%, takes tensile sample to examine after quenched, examination The 75% of a diameter of nominal size of sample stretch section, yield strength Rp0.2 >=940MPa of round steel, tensile strength Rm satisfactions 1040~ 1140MPa ranges, elongation percentage >=9%, the contraction percentage of area >=48% take Akv2 impact specimens, -20 DEG C of Charpy at half radius Ballistic work >=27J, within round steel total cross-section HV0.3 320~380HV of hardness, total cross-section nonhomogeneous hardness 30HV.
2. the method for carbon and low-alloy round steel in fastener high-hardenability described in a kind of manufacturing claims 1, it is characterised in that：Work Skill step is that raw materials for metallurgy produces molten steel through converter smelting or electric furnace smelting, LF refining, RH degassings or VD degassings successively, essence Ti lines and ferro-boron are fed after refining；Molten steel, at continuous casting billet, is connected using 15~40 DEG C of low overheat whole process argon for protecting pouring Strand send or enters burial pit slow cooling 32 hours or more through 300~600 DEG C of temperature, goes out hole；Continuous casting billet is heated to 1200~1250 DEG C, Heat preservation 3~10 hours, comes out of the stove；Open rolling within the temperature range of 1100~1150 DEG C, rolls into round steel bar after high-pressure water descaling； Bar directly carries out continuous oven modifier treatment and obtains quenched round steel；Round steel after quenched can be directly used for processing and meet ISO 898- The fasteners such as 1 standard, 10.9 rank bolt；
Above-mentioned hardening and tempering process includes quenching and tempering, can carry out on roller-bottom type continuous oven or the line of induction, be carried out on the stove of roller bottom When, quenching temperature is 840~880 DEG C, and time inside furnace is 60~360min, uses quenching ring water quenching；Tempering heating-up temperature It it is 530~620 DEG C, time inside furnace is 300~600min, air-cooled after coming out of the stove or water cooling to room temperature；When being carried out on the line of induction, quench Fiery heating temperature is 880~950 DEG C, and time inside furnace is 3~10min, uses quenching ring water quenching；Tempering heating-up temperature be 600~ 700 DEG C, time inside furnace is 3~10min, air-cooled after coming out of the stove or water cooling to room temperature.
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