CN102912093A - Production technological method for ultralow-hardness low-alloy steel - Google Patents
Production technological method for ultralow-hardness low-alloy steel Download PDFInfo
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- CN102912093A CN102912093A CN 201110220264 CN201110220264A CN102912093A CN 102912093 A CN102912093 A CN 102912093A CN 201110220264 CN201110220264 CN 201110220264 CN 201110220264 A CN201110220264 A CN 201110220264A CN 102912093 A CN102912093 A CN 102912093A
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Abstract
The invention relates to the improved technology of internal-combustion engine piston pin materials and discloses a production technological method for ultralow-hardness low-alloy steel. The production technological method for the ultralow-hardness low-alloy steel includes the step of cutting of 20Cr cold-drawn steel by the aid of a high-speed precision rod shear, and is characterized by including the steps of softening annealing of cut billets, namely spheroidizing annealing and recrystallization annealing by the aid of the controlled atmosphere double-layer gas and electricity hybrid annealing technology. Steel products produced by the method has the advantages of small carbide particles, high and uniform dispersion, moderate hardness as the HB (Brinell hardness) is not more than 135, easiness in processing and thin decarburized layers or no decarburization, and the method can completely meet the production technology requirements on cold extrusion forming of piston pins.
Description
(i) technical field: the present invention relates to the improvement technology of internal combustion engine piston pin material, especially a kind of producing and manufacturing technique of super-low-hardness low alloy steel.
(ii) background technology: the applicant has the internal combustion engine piston pin factory of scale to cooperate with domestic several families for a long time, and its main products is the 20Cr cold-drawn steel, and this product is the leading material of producing internal combustion engine piston pin.Each producer adopted to cut the techniques such as scale, size, brill endoporus, polished surface, cold drawn rear direct use in the past.Between steel hardness HB185-210, steel hardness is not had to particular requirement.In the nearly stage, each producer is improved production technique, to reduce production costs, improves the market competitiveness, is mainly to be pressed into the work in-process shape by cold-extruded after cutting scale, phospholeum, directly grinds the techniques such as surface.Due to the endoporus that is cold-extrusion shaping, can save the techniques such as turning, boring.Extrusion molding can be saved metal loss more than 40%.So cold drawn steel hardness there is the requirement of superelevation.Require the front hardness≤HB135 of steel extruding, this is the new demand of this technique to steel.
(iii) summary of the invention: purpose of the present invention is exactly to meet the new requirement that the user proposes steel hardness, and a kind of producing and manufacturing technique of super-low-hardness low alloy steel is provided.
Concrete scheme of the present invention is: a kind of producing and manufacturing technique of super-low-hardness low alloy steel, at first get the 20Cr cold-drawn steel and adopt the high speed precision rod cutting machine blanking, it is characterized in that: the blank after blanking is carried out to softening annealing, adopt the double-deck combustion gas electricity of controlled atmosphere to mix annealing technology and carry out Spheroidizing Annealing, recrystallization annealing.
More than softening annealing Heating temperature AC3 described in the present invention, cooling temperature is controlled at following 300 ℃ of Ar1.
Softening annealing process Heating temperature described in the present invention is 860 ± 10 ℃, is incubated 6 hours, and the 30 ° of c/n that lower the temperature are down to≤500 ℃ of air coolings of coming out of the stove.
The steel that the present invention produces have that carbide particle is tiny, and plastisied dispersion is high and even, and the moderate HB of hardness≤135 are easy to processing, and Decarburized layer is thin or without the decarburization characteristics, can meet the manufacturing technique requirent of cold extrusion shaped wrist pin fully.Adopt the steel that the present invention produces to manufacture wrist pin, can conveniently realize cold extrusion shaped processing, product surface is highly polished, and size uniform is directly spent the conformance with standard requirement.
(iv) embodiment:
1. adopt the blanking of 1.4MN hydraulic pressure bar accurate-shearing machine: get the cold drawn steel of 20Cr, specification 10-60mm, cutting length 20-920mm, fixed length precision ± 0.1mm, the shearing die range is 50.8mm.
2. the blank after blanking is carried out to softening annealing: adopt the double-deck combustion gas electricity of controlled atmosphere to mix annealing technology and carry out Spheroidizing Annealing, recrystallization annealing, more than softening annealing Heating temperature AC3, cooling temperature is controlled at following 300 ℃ of Ar1, the softening annealing process Heating temperature is 860 ± 10 ℃, be incubated 6 hours, the 30 ° of c/n that lower the temperature, be down to≤500 ℃ of air coolings of coming out of the stove.
3. the cold extrusion shaped wrist pin of high precision temp; Select S-THP61-500+1250+1000 temperature cold extrusion production line to manufacture wrist pin.
Claims (3)
1. the producing and manufacturing technique of a super-low-hardness low alloy steel, at first get the 20Cr cold-drawn steel and adopt the high speed precision rod cutting machine blanking, it is characterized in that: the blank after blanking is carried out to softening annealing, adopt the double-deck combustion gas electricity of controlled atmosphere to mix annealing technology and carry out Spheroidizing Annealing, recrystallization annealing.
2. the producing and manufacturing technique of a kind of super-low-hardness low alloy steel according to claim 1 is characterized in that: more than described softening annealing Heating temperature AC3, cooling temperature is controlled at following 300 ℃ of Ar1.
3. the producing and manufacturing technique of a kind of super-low-hardness low alloy steel according to claim 1, it is characterized in that: described softening annealing process Heating temperature is 860 ± 10 ℃, is incubated 6 hours, the 30 ° of c/n that lower the temperature are down to≤500 ℃ of air coolings of coming out of the stove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110220264 CN102912093A (en) | 2011-08-03 | 2011-08-03 | Production technological method for ultralow-hardness low-alloy steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110220264 CN102912093A (en) | 2011-08-03 | 2011-08-03 | Production technological method for ultralow-hardness low-alloy steel |
Publications (1)
| Publication Number | Publication Date |
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| CN102912093A true CN102912093A (en) | 2013-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201110220264 Pending CN102912093A (en) | 2011-08-03 | 2011-08-03 | Production technological method for ultralow-hardness low-alloy steel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103572013A (en) * | 2013-11-19 | 2014-02-12 | 东北大学 | Spheroidizing annealing method of 40Cr steel |
| CN107825087A (en) * | 2017-12-12 | 2018-03-23 | 盛瑞传动股份有限公司 | A kind of piston pin roughing technique |
-
2011
- 2011-08-03 CN CN 201110220264 patent/CN102912093A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103572013A (en) * | 2013-11-19 | 2014-02-12 | 东北大学 | Spheroidizing annealing method of 40Cr steel |
| CN103572013B (en) * | 2013-11-19 | 2015-09-02 | 东北大学 | A kind of Spheroidizing Annealing method of 40Cr steel |
| CN107825087A (en) * | 2017-12-12 | 2018-03-23 | 盛瑞传动股份有限公司 | A kind of piston pin roughing technique |
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Application publication date: 20130206 |