CN103276163A - Method for eliminating net-shaped and chain alloy carbides generated from steel containing Cr and Ni during heat treatment - Google Patents
Method for eliminating net-shaped and chain alloy carbides generated from steel containing Cr and Ni during heat treatment Download PDFInfo
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- CN103276163A CN103276163A CN2013101975860A CN201310197586A CN103276163A CN 103276163 A CN103276163 A CN 103276163A CN 2013101975860 A CN2013101975860 A CN 2013101975860A CN 201310197586 A CN201310197586 A CN 201310197586A CN 103276163 A CN103276163 A CN 103276163A
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Abstract
The invention provides a method for eliminating net-shaped and chain alloy carbides generated from steel containing Cr and Ni during heat treatment. The method comprises the following steps of: putting defective net-shaped carbides or strip-shaped carbides into a heat treatment furnace; heating the carbides to approach to the Ac1 phase-transition temperature and then preserving the temperature, thereby generating austenitic transformation on the carbides; raising the temperature to reach 860 DEG C or so, thereby dissolving the defective carbides in the austenite; decreasing the temperature to reach the quenching temperature; and performing normal quenching and tempering again. After the products are treated by using the method, the defective products can be converted into acceptable products.
Description
Technical field
The present invention relates to the heat treatment technics field, particularly a kind of removing method that produces netted and chain alloy carbide in Cr, the thermal treatment of Ni steel that contains.
Background technology
The steel that contains Cr, Ni element can increase substantially hardening capacity and the hardenability of steel, this steel can have higher intensity and high impelling strength after thermal treatment, but this steel cools off just can quench in air and gets angry, and in cooling slowly, can make alloy carbide assemble to the crystal boundary place and separate out, the performance of steel is become fragile.It is more obvious when especially carbon content is high in the steel, in case as improper carbide network or the strip carbide of having produced of large-scale carburizing part thermal treatment, workpiece strength and impelling strength sharply descend, and serious can both smash with sledgehammer sometimes, check that according to quality standard this is serious unacceptable product.
Summary of the invention
This workpiece that contains Cr, Ni steel is more valuable, and cost is higher, several ten thousand yuan at least of large-scale workpieces, hundreds of thousands of unit at most.In order to reduce mass loss, unacceptable product is changed into salable product, provide removing method as follows:
The unacceptable product that carbide network or strip carbide are arranged is packed in the heat treatment furnace, be incubated near being heated to the Ac1 transformation temperature earlier, make it to take place austenitic transformation, be warmed up to again about 860 ℃, purpose is dissolved in the austenite underproof carbide, temperature is dropped to that quenching temperature is normally quenched again, tempering again.
Product is handled through this method, can make substandard product become qualified product.
Embodiment
Embodiment 1
Eliminating carbide network with the large-scale carburizing bearing circle of 20Cr2Ni4 is example: the workpiece that carbide network is arranged is packed in the heat treatment furnace, be heated to 750 ℃-760 ℃ earlier, be incubated 2 hours, make its generation austenitic transformation, but at this moment still can not eliminate carbide network.Need continue to be warmed up to 860 ℃-870 ℃ again, be incubated 2-2.5 hour approximately behind the samming, carbide network is dissolved in the austenite, observe to determine soaking time by taking out coupon during real work, after the carbide network dissolving, temperature is dropped to 810 ℃ ± 10 ℃, insulation was come out of the stove in 1-1.5 hour behind the samming, put into the quenching oil quenching after workpiece is come out of the stove, workpiece temperature is come out of the stove air cooling to room temperature after 150 ℃, at 4 hours with the interior temper of carrying out.Tempering temperature is according to the intensity of workpiece, hardness and decide.The metallographic structure of workpiece is " martensite+residual austenite and a spot of little granular carbide " after the tempering, and at this moment product has become salable product, can change next procedure production over to.
Claims (5)
1. contain the removing method that produces netted and chain alloy carbide in Cr, the thermal treatment of Ni steel, it is characterized in that, the unacceptable product that carbide network or strip carbide are arranged is packed in the heat treatment furnace, be incubated near being heated to the Ac1 transformation temperature earlier, make it to take place austenitic transformation, be warmed up to again about 860 ℃, again temperature dropped to that quenching temperature is normally quenched again, tempering.
2. the removing method that produces netted and chain alloy carbide in Cr, the thermal treatment of Ni steel that contains according to claim 1 is characterized in that described steel is 20Cr2Ni4 steel, 25 CrNi4WA steel, 30Cr2Ni2WA steel, 35CrNi3WA steel.
3. the removing method that produces netted and chain alloy carbide in Cr, the thermal treatment of Ni steel that contains according to claim 1 is characterized in that the Equipment for Heating Processing that described method adopts is car type furnace, multipurpose furnace, vacuum oven, pit furnace.
4. the removing method that produces netted and chain alloy carbide in Cr, the thermal treatment of Ni steel that contains according to claim 1 is characterized in that, for there being the very big workpiece of process redundancy to handle in protective atmosphere.
5. the removing method that produces netted and chain alloy carbide in Cr, the thermal treatment of Ni steel that contains according to claim 1 is characterized in that, described method adopts vacuum oven to heat-treat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101975860A CN103276163A (en) | 2013-05-24 | 2013-05-24 | Method for eliminating net-shaped and chain alloy carbides generated from steel containing Cr and Ni during heat treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101975860A CN103276163A (en) | 2013-05-24 | 2013-05-24 | Method for eliminating net-shaped and chain alloy carbides generated from steel containing Cr and Ni during heat treatment |
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| CN103276163A true CN103276163A (en) | 2013-09-04 |
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| CN2013101975860A Pending CN103276163A (en) | 2013-05-24 | 2013-05-24 | Method for eliminating net-shaped and chain alloy carbides generated from steel containing Cr and Ni during heat treatment |
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| CN (1) | CN103276163A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112176266A (en) * | 2020-09-04 | 2021-01-05 | 北京科技大学 | Control method of GH4105 nickel-based alloy carbide strip structure |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1363694A (en) * | 2001-01-10 | 2002-08-14 | 江南机器厂 | Heat treating technology of 30CrMnSi steel for higher toughness and antiwear nature |
-
2013
- 2013-05-24 CN CN2013101975860A patent/CN103276163A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1363694A (en) * | 2001-01-10 | 2002-08-14 | 江南机器厂 | Heat treating technology of 30CrMnSi steel for higher toughness and antiwear nature |
Non-Patent Citations (2)
| Title |
|---|
| 孙广平等: ""大型齿轮渗碳时网状碳化物形成的原因及消除的方法"", 《汽轮机技术》 * |
| 张保勤: "《中级热处理检查工培训教材》", 31 December 1992, 机械工业出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112176266A (en) * | 2020-09-04 | 2021-01-05 | 北京科技大学 | Control method of GH4105 nickel-based alloy carbide strip structure |
| CN112176266B (en) * | 2020-09-04 | 2022-01-18 | 北京科技大学 | Control method of GH4105 nickel-based alloy carbide strip structure |
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Application publication date: 20130904 |