CN104195572A - Softening method for cold extrusion preform body of automotive body steel - Google Patents
Softening method for cold extrusion preform body of automotive body steel Download PDFInfo
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- CN104195572A CN104195572A CN201410428268.5A CN201410428268A CN104195572A CN 104195572 A CN104195572 A CN 104195572A CN 201410428268 A CN201410428268 A CN 201410428268A CN 104195572 A CN104195572 A CN 104195572A
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Abstract
The invention discloses a softening method for a cold extrusion preform body of automotive body steel. The softening method comprises the following steps: adopting an isothermal quenching process and an isothermal normalizing process to soften cold extrusion alloy steel preform body under a hot rolling state, then, carrying out phosphating treatment, namely softening the surface of the preform body; and then, uniformly coating a layer of high polymer coating agents on the surface of the preform body; and finally, extruding and molding the alloy steel preform body, and carrying out flaw detection on a cold extrusion product by virtue of a steel flaw detector. Meanwhile, the invention further discloses a formula for phosphating. The method provided by the invention can be used for enabling the automotive body steel to have relatively good plasticity and toughness and enabling a tissue of the automotive body steel to be relatively uniform in a softening process, so that the automotive body steel has relatively good safety.
Description
Technical field
The present invention relates to the method in a kind of heat treatment technics field, relate in particular to a kind of softening method of car body steel cold extrusion blank.
Background technology
Today of automotive industry high speed development, the cold-extrusion technology of home and overseas has also had develop rapidly, and reaching the same goal by different routes is all to want automobile to make to such an extent that more have the sense of security; Especially for car body steel this part, when requiring vehicle body firm, also to possess very large toughness and elasticity, make car body after being squeezed and colliding, can farthest protect personnel safety; Car body steel mostly adopts the method for isothermal normalizing and phospholeum to make its blank softening at present, make it possess good ductility and improve work-ing life, but from effect, the blank that aforesaid method obtains, in toughness and on work-ing life, need further raising, and major cause is, its technique seems that some is simple, especially the link of phospholeum, the chemical reaction of batching and blank is not deep enough and lasting, and whole bating effect is inadequate.
Summary of the invention
Technical problem to be solved by this invention is, a kind of softening method that makes car body steel obtain the blank of fine moulding, toughness is provided, and the method makes body of a motor car steel possess better security.
For solving the problems of the technologies described above, the softening method of a kind of car body steel cold extrusion blank provided by the invention, select steel alloy, described steel alloy adopts isothermal quenching and isothermal normalizing technique to soften the cold extrusion steel alloy blank under hot-rolled state, first steel alloy is cut into the blank of definite shape, again blank is carried out to means of isothermal quenching, obtain lower bainite to strengthen the intensity of steel, hardness, toughness, wear resistance and plasticity, after cooling at normal temperatures Deng blank, blank is carried out to isothermal normalizing processing, then carry out bonderizing, blank surface is softened to processing, then in blank surface, evenly brush one deck polymer paint, finally by the extrusion molding of steel alloy blank, and adopt steel gamma defectoscope to detect a flaw to cold extrusion product.
In the present invention, described isothermal quenching step is:
(1) steel part heating is made after its austenitizing homogenizing, makes it to be as cold as soon bainite transformation temperature range (265～410 ℃),
(2) put into the salt made from earth containing a comparatively high percentage of sodium chloride that a little higher than Ms of temperature orders and bathe or alkaline bath, isothermal keeps 30-60 minute, and making austenitic transformation is bainite, then takes out that to be placed in air cooling.
The invention also discloses parkerized formula, be specially: zinc oxide 10-20g, phosphatase 11 5-20g, nitric acid 20-29g, sodium carbonate 7-9g, Sodium Nitrite 0.25-0.29g, water 2kg, adopts above-mentioned materials formula to be first mixed with concentrated mother liquor, then with 10 times of water dilutions.
The present invention combines by isothermal quenching and isothermal normalizing, bonderizing and brushing polymer paint, make steel alloy possess better ductility, toughness and rigidity, in softening process, its tissue becomes more even, thereby has improved the intensity of vehicle body integral body, has further increased security.
Embodiment
Adopt embodiment to be described in more detail invention below.
A kind of softening method of car body steel cold extrusion blank, first it use high strength alloy steel in selection, what this steel alloy adopted is the technique that isothermal quenching and isothermal normalizing technique combine, cold extrusion steel alloy under hot-rolled state is softened, its process is: the blank that first steel alloy is cut into definite shape, again blank is carried out to means of isothermal quenching, its main purpose is to obtain lower bainite to strengthen intensity, hardness, toughness, wear resistance and the plasticity of steel; In this step, the concrete steps of isothermal quenching be:
(1) steel part blank heating is made after its austenitizing homogenizing, make it to be as cold as soon bainite transformation temperature range (temperature range is 265～410 ℃);
(2) blank is put into the salt made from earth containing a comparatively high percentage of sodium chloride that a little higher than Ms of temperature orders and bathed or alkaline bath, isothermal keeps 30-60 minute, and making austenitic transformation is bainite, then takes out that to be placed in air cooling.
Deng blank carry out at normal temperatures cooling after, again blank is carried out to isothermal normalizing processing, then carry out bonderizing, blank surface is softened to processing, after bonderizing, also need to, at the even scrubbing brush one deck of blank surface polymer paint, finally by the extrusion molding of steel alloy blank, and adopt steel gamma defectoscope to detect a flaw to cold extrusion product.
The invention also discloses parkerized formula, be specially: zinc oxide 10-20g, phosphatase 11 5-20g, nitric acid 20-29g, sodium carbonate 7-9g, Sodium Nitrite 0.25-0.29g, water 2kg, adopts above-mentioned materials formula to be first mixed with concentrated mother liquor, then with 10 times of water dilutions.
Claims (3)
1. the softening method of a car body steel cold extrusion blank, it is characterized in that, select steel alloy, described steel alloy adopts isothermal quenching and isothermal normalizing technique to soften the cold extrusion steel alloy blank under hot-rolled state, first steel alloy is cut into the blank of definite shape, again blank is carried out to means of isothermal quenching, obtain lower bainite to strengthen the intensity of steel, hardness, toughness, wear resistance and plasticity, after cooling at normal temperatures Deng blank, blank is carried out to isothermal normalizing processing, then carry out bonderizing, blank surface is softened to processing, then in blank surface, evenly brush one deck polymer paint, finally by the extrusion molding of steel alloy blank, and adopt steel gamma defectoscope to detect a flaw to cold extrusion product.
2. the softening method of a kind of car body steel cold extrusion blank according to claim 1, described isothermal quenching step is:
(1) steel part heating is made after its austenitizing homogenizing, makes it to be as cold as soon bainite transformation temperature range (265～410 ℃),
(2) put into the salt made from earth containing a comparatively high percentage of sodium chloride that a little higher than Ms of temperature orders and bathe or alkaline bath, isothermal keeps 30-60 minute, and making austenitic transformation is bainite, then takes out that to be placed in air cooling.
3. the softening method of a kind of car body steel cold extrusion blank according to claim 1, it is characterized in that, described parkerized formula is: zinc oxide 10-20g, phosphatase 11 5-20g, nitric acid 20-29g, sodium carbonate 7-9g, Sodium Nitrite 0.25-0.29g, water 2kg, adopts above-mentioned materials formula to be first mixed with concentrated mother liquor, then with 10 times of water dilutions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410428268.5A CN104195572A (en) | 2014-08-27 | 2014-08-27 | Softening method for cold extrusion preform body of automotive body steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410428268.5A CN104195572A (en) | 2014-08-27 | 2014-08-27 | Softening method for cold extrusion preform body of automotive body steel |
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| Publication Number | Publication Date |
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| CN104195572A true CN104195572A (en) | 2014-12-10 |
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| CN201410428268.5A Pending CN104195572A (en) | 2014-08-27 | 2014-08-27 | Softening method for cold extrusion preform body of automotive body steel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106011814A (en) * | 2016-06-17 | 2016-10-12 | 霍山县龙鑫金属制品有限公司 | Surface phosphating treatment technique for steel |
| EP3332040B1 (en) | 2015-08-07 | 2021-03-03 | voestalpine BÖHLER Edelstahl GmbH & Co KG | Method for producing a tool steel |
-
2014
- 2014-08-27 CN CN201410428268.5A patent/CN104195572A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3332040B1 (en) | 2015-08-07 | 2021-03-03 | voestalpine BÖHLER Edelstahl GmbH & Co KG | Method for producing a tool steel |
| CN106011814A (en) * | 2016-06-17 | 2016-10-12 | 霍山县龙鑫金属制品有限公司 | Surface phosphating treatment technique for steel |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20141210 |