CN103866195B - Carbon and low-alloy boron-containing structural steel and heat treatment method in one - Google Patents
Carbon and low-alloy boron-containing structural steel and heat treatment method in one Download PDFInfo
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- CN103866195B CN103866195B CN201210543746.8A CN201210543746A CN103866195B CN 103866195 B CN103866195 B CN 103866195B CN 201210543746 A CN201210543746 A CN 201210543746A CN 103866195 B CN103866195 B CN 103866195B
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Abstract
Carbon and low-alloy boron-containing structural steel and heat treatment method thereof in one, it is characterized in that its chemical compositions by percentage is: C0.37～0.44wt%, Si1.2～1.6wt%, Mn0.50～0.80wt%, Cr0.6～1.1wt%, S≤0.035wt%, P≤0.035wt%, B0.0005～0.0035wt%, surplus is Fe；It will forging after bar through 850 ~ 870 DEG C × 30 ~ 40 minutes water-cooleds to room temperature, then through 350 ~ 650 DEG C be incubated 150 ~ 160 minutes, water-cooled is to room temperature.Its chemical composition and smelting cost are close with 40Cr steel, but comprehensive mechanical property is better than 40Cr after modifier treatment, especially quenching degree is apparently higher than 40Cr, can be used for manufacturing large-scale cold-heading die steel module and the macrotype axes series of high-hardenability requirement and gear, can substitute for 40Cr steel in machine-building popularization and application in the industry.
Description
Technical field
The invention belongs to low-alloy structural steel, chemical composition and smelting cost are close with 40Cr steel, but comprehensive mechanical property is better than 40Cr after modifier treatment, especially quenching degree is apparently higher than 40Cr, can be used for manufacturing large-scale cold-heading die steel module and the macrotype axes series of high-hardenability requirement and gear, can substitute for 40Cr steel in machine-building popularization and application in the industry.
Background technology
The structural alloy steels such as 40Cr, 45MnB, 45B are used in the parts such as axle class, gear, die module more, are mainly used to support transmission parts, transmit moment of torsion and bear load.Work, often by alternate load effect, causes fatigue failure to destroy, and being significantly increased along with section size, and the quenching degree of existing structure steel can not meet use requirement.In order to improve intensity and the quenching degree of material, the stress state improving heat treatment rear part is badly in need of developing the structural steel that a kind of relative temperature comprehensive mechanical property good compared with high-hardenability is excellent.
This material is on the basis of said structure steel, the composition of Si is scheduled between 1.2%～1.6% scope, and add suitable B element raising quenching degree, its element constitutes proportion: C0.37～0.44wt%, Si1.2～1.6wt%, Mn0.50～0.80wt%, Cr0.6～1.1wt%, S≤0.035wt%, P≤0.035wt%, B0.0005～0.0035wt%, remaining is Fe.Good comprehensive mechanical property is obtained after quenched and average tempering.
Summary of the invention
First technical problem to be solved by this invention is to provide a kind of low-alloy structural steel, its chemical composition and smelting cost are close with 40Cr steel, but comprehensive mechanical property is better than 40Cr after modifier treatment, especially quenching degree is apparently higher than 40Cr, can be used for manufacturing large-scale cold-heading die steel module and the macrotype axes series of high-hardenability requirement and gear, can substitute for 40Cr steel in machine-building popularization and application in the industry.
Second technical problem to be solved by this invention is to provide a kind of relevant heat treatment method, to obtain the fine grained texture of grain size more than 9 grades, and there is high quenching degree, tensile strength Rm is 900～1984MPa, elongation percentage A is 7%～20%, hardness HRC changes in the range of 30HRC～65HRC, meets the parts such as axle class, gear, die module to material mechanical performance and the requirement of quenching degree.
The present invention solves the technical scheme that above-mentioned first technical problem used: carbon and low-alloy boron-containing structural steel in one, it is characterized in that its chemical compositions by percentage is: C0.37～0.44wt%, Si1.2～1.6wt%, Mn0.50～0.80wt%, Cr0.6～1.1wt%, S≤0.035wt%, P≤0.035wt%, B0.0005～0.0035wt%, surplus is Fe.
The present invention solves the technical scheme that above-mentioned second technical problem used: the heat treatment method of a kind of above-mentioned middle carbon and low-alloy boron-containing structural steel, it is characterized in that: the bar after forging through 850 ~ 870 DEG C × 30 ~ 40 minutes water-cooleds to room temperature, being incubated 150 ~ 160 minutes through 350 ~ 650 DEG C again, water-cooled is to room temperature.
As preferably, the bar after described forging to room temperature, then is incubated 155 minutes through 350 ~ 650 DEG C through 860 DEG C × 35 minutes water-cooleds, and water-cooled is to room temperature.
Compared with prior art; it is an advantage of the current invention that: this low-alloy boron-containing structural steel uses Eccentric Bottom Tapping In Eaf add LF refine and carry out VD evacuation smelting; argon for protecting pouring; modifier treatment is carried out after forged molding or roll forming; the fine grained texture of grain size more than 9 grades can be obtained; and there is high quenching degree; tensile strength Rm is 900～1984MPa; elongation percentage A is 7%～20%; hardness HRC changes in the range of 30HRC～65HRC, meets the parts such as axle class, gear, die module to material mechanical performance and the requirement of quenching degree；The intensity level suitable with 40Cr can be obtained under identical temperature, but 45MnB, 45B steel (performance comparison situation is shown in Table 1) of material plasticity significantly larger than 40Cr steel and therewith similar nature, it is used for manufacturing axial workpiece, there is more preferable anti-torsion fatigue behaviour, the service life of part can be greatly improved.
The mechanical property contrast of several steel alloy of table 1.
Accompanying drawing explanation
Fig. 1 is metallographic pattern after 860 DEG C × 35min water-cooled+350 DEG C × 155min water-cooled；
Fig. 2 is metallographic pattern after 860 DEG C × 35min water-cooled+650 DEG C × 155min water-cooled；
Fig. 3 is metallographic pattern after 860 DEG C × 35min water-cooled+550 DEG C × 155min water-cooled.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail.
Embodiment 1:
Alloying component is C:0.43wt%, Si:1.5wt%, Mn:0.809wt%, Cr:0.91wt%, B:0.0048wt%, S:0.004wt%, P:0.014wt%, surplus is Fe, the bar after forging through 860 DEG C × 35 minutes water-cooleds to room temperature, then through 350 DEG C insulation 2 hours 35 minutes water-cooleds to room temperature, obtain tensile strength Rm1984MPa, yield strength Rp0.21705MPa, elongation percentage A15%, hardness HRC60HRC, grain size is 10 grades, and pattern is shown in Fig. 1.
Embodiment 2:
Alloying component is C:0.372wt%, Si:1.21wt%, Mn:0.577wt%, Cr:0.76wt%, B:0.001wt%, S:0.004wt%, P:0.014wt%, surplus is Fe, the bar after forging through 860 DEG C × 35 minutes water-cooleds to room temperature, then through 650 DEG C insulation 155 minutes water-cooleds to room temperature, obtain tensile strength Rm994MPa, yield strength Rp0.2846MPa, elongation percentage A21.5%, hardness 45HRC, grain size is 9 grades, and pattern is shown in Fig. 2
Embodiment 3:
Alloying component is C:0.4wt%, Si:1.29wt%, Mn:0.66wt%, Cr:0.79wt%, B:0.002wt%, S:0.003wt%, P:0.015wt%, surplus is Fe, and the bar after forging is through 880 DEG C of normalizings, within 860 DEG C × 35 minutes, water-cooled is to room temperature, again through 155 minutes water-cooleds of 550 DEG C of insulations to room temperature, it is thus achieved that tensile strength Rm1010MPa, yield strength Rp0.2882MPa, elongation percentage A17.8%, hardness 33HRC, grain size is 10 grades, and pattern is shown in Fig. 3.
Claims (1)
1. carbon and low-alloy boron-containing structural steel in a kind, it is characterized in that its chemical compositions by percentage is: C0.4～0.44wt%, Si1.2～1.29wt%, Mn0.50～0.66wt%, Cr0.91～1.1wt%, S0.003～0.035wt%, P≤0.035wt%, B0.0005～0.0035wt%, surplus is Fe；
In this carbon and low-alloy boron-containing structural steel by following heat treatment method process obtain: the bar after forging through 860 DEG C × 35 minutes water-cooleds to room temperature, then through 350～650 DEG C be incubated 155 minutes, water-cooled is to room temperature.
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| CN201210543746.8A CN103866195B (en) | 2012-12-14 | 2012-12-14 | Carbon and low-alloy boron-containing structural steel and heat treatment method in one |
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| CN103866195A CN103866195A (en) | 2014-06-18 |
| CN103866195B true CN103866195B (en) | 2016-08-03 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1186871A (en) * | 1996-06-28 | 1998-07-08 | 河北省辛集市贝氏体钢总厂 | Wear resistant alloy steel and wear resistant steel ball made from said steel |
| CN101792884A (en) * | 2009-12-31 | 2010-08-04 | 首钢总公司 | Steel with underrelaxation and hydrogen corrosion resistance for high-speed railway prestressed pull rod and production method thereof |
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| JPS56119728A (en) * | 1980-02-25 | 1981-09-19 | Sumitomo Metal Ind Ltd | Manufacture of high tensile wire rod |
| CN1350070A (en) * | 2001-10-16 | 2002-05-22 | 黎业生 | High-stress low-carbon martensitic spring steel 35Si2CrVB and its production process |
| CN102134679A (en) * | 2011-02-22 | 2011-07-27 | 天津市银龙预应力钢材集团有限公司 | Heat treatable overlarge-diameter high-strength steel and preparation methods thereof |
| CN102517499A (en) * | 2011-12-19 | 2012-06-27 | 张家港市鼎力铸钢有限公司 | High-strength and low-cost dilute alloy wear resistant cast steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1186871A (en) * | 1996-06-28 | 1998-07-08 | 河北省辛集市贝氏体钢总厂 | Wear resistant alloy steel and wear resistant steel ball made from said steel |
| CN101792884A (en) * | 2009-12-31 | 2010-08-04 | 首钢总公司 | Steel with underrelaxation and hydrogen corrosion resistance for high-speed railway prestressed pull rod and production method thereof |
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