CN104404533A - Heat treatment process for fishing tool made of 20CrNi2Mo steel - Google Patents
Heat treatment process for fishing tool made of 20CrNi2Mo steel Download PDFInfo
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- CN104404533A CN104404533A CN201410662515.8A CN201410662515A CN104404533A CN 104404533 A CN104404533 A CN 104404533A CN 201410662515 A CN201410662515 A CN 201410662515A CN 104404533 A CN104404533 A CN 104404533A
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- fishing tool
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- 20crni2mo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 73
- 239000010959 steel Substances 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000010438 heat treatment Methods 0.000 title abstract description 25
- 238000005255 carburizing Methods 0.000 claims abstract description 24
- 238000010791 quenching Methods 0.000 claims abstract description 24
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 230000000171 quenching effect Effects 0.000 claims abstract description 14
- 238000005496 tempering Methods 0.000 claims abstract description 9
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052796 boron Inorganic materials 0.000 claims abstract description 8
- 238000009792 diffusion process Methods 0.000 claims abstract description 8
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 8
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 8
- 238000007669 thermal treatment Methods 0.000 claims description 26
- 239000003961 penetration enhancing agent Substances 0.000 claims description 14
- 229910052799 carbon Inorganic materials 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 7
- 238000007493 shaping process Methods 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 4
- 238000004321 preservation Methods 0.000 abstract description 3
- 230000000149 penetrating effect Effects 0.000 abstract 2
- 238000012797 qualification Methods 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 238000005275 alloying Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- -1 poly-alkylene ethylene glycol Chemical compound 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Heat Treatment Of Articles (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The invention relates to a heat treatment process for a fishing tool made of 20CrNi2Mo steel. The heat treatment process is characterized in that rare earth and boron which are 0.5wt% and 0.25wt% of a penetrating agent are added into the penetrating agent in an exhaust process; heating a carburizing furnace to 830-860 DEG C and carrying out heat preservation for 5-6 hours for carburization; utilizing a quenching liquid for quenching treatment directly after carrying out 2 hours of diffusion; placing a quenched fishing tool in a heating furnace to heat the fishing tool to 180-200 DEG C; carrying out heat preservation for 3.5-4.5 hours and then carrying out tempering. The heat treatment process is simple, convenient to control, low in production cost, and high in speed and efficiency, and has the advantages that not only the product quality can be improved, but also the production cost can be reduced; the heat treatment process is simplified to achieve an ideal effect; the deformation of the fishing tool can be effectively reduced, so that the product qualification rate can be increased.
Description
Technical field
The present invention relates to metal heating processing technology, be specifically related to a kind of thermal treatment process of 20CrNi2Mo steel fishing tool.
Background technology
In the past, my company adopted 20Cr2Ni4 steel to produce oil fishing tool carburized parts, and 20Cr2Ni4 steel belongs to high quality steel, in actual use, there is numerous problem and blemishs.Because alloying element content is high, remaining Austriaization scale of construction is too much, and make thermal treatment process complicated, inconvenience controls.During 20Cr2Ni4 steel heat treatment, carburizing temperature is higher, and high tempering temperature is also higher, and cause production cost higher, heat treatment deformation is serious.And due to 20Cr2Ni4 hardness of steel higher, distortion correction also especially difficulty.Slow by 20Cr2Ni4 steel production fishing tool heat treatment process speed, efficiency comparison is low, directly affects production rate.Along with the raising gradually that development and the quality product of oil exploitation technology require, adopt current 20Cr2Ni4 steel and explained hereafter fishing tool can not meet the requirement of producing fishing tool.
Summary of the invention
The object of this invention is to provide a kind of technique simple, be convenient to control, production cost is low, and heat treatment process speed is fast, the 20CrNi2Mo steel fishing tool thermal treatment process that efficiency is high.
Technical solution of the present invention is:
20CrNi2Mo steel fishing tool thermal treatment process, it comprises the following steps:
1, be vented: machined shaping 20CrNi2Mo steel fishing tool is put into cementing furnace, in penetration enhancer, add the rare earth of penetration enhancer weight 0.5% and the boron of 0.25%, to vacuumizing and exhausting in body of heater simultaneously;
2, ooze by force: cementing furnace is heated to 830 DEG C-860 DEG C, be incubated and carburizing carried out to fishing tool in 5-6 hour;
3, spread: make fishing tool deposit in cementing furnace after being slowed down by penetration enhancer and make it spread in 2 hours;
4, quench: utilize hardening liquid directly to carry out quench treatment to the fishing tool after diffusion;
5, tempering: be placed in process furnace by the fishing tool after quenching and be heated to 180 DEG C-200 DEG C, insulation 3.5-4.5 hour, air cooling of coming out of the stove is to room temperature, and thermal treatment completes.
Hardening liquid is PAG class hardening liquid.PAG class hardening liquid is by the water-soluble quenching medium of the water solvent in the doping of poly-alkylene ethylene glycol (Polyaleneglycol) polymkeric substance.Poly-alkylene ethylene glycol is the multipolymer of a kind of oxyethane and propylene oxide, is called for short PAG.
Technique effect of the present invention is: it is simple that it has technique, and be convenient to control, production cost is low, and heat treatment process speed is fast, the advantage that efficiency is high.It both can improve the quality of product, can reduce production cost again, which simplify thermal treatment process, reached desirable effect.Effectively can also reduce the deflection of fishing tool, can conforming product rate be improved.
The advantage of this thermal treatment process is:
1,20CrNi2Mo Heat Treatment Of Steel deformation tendency is less, and carburizing performance, surface hardening are functional, and remnants Austriaization body burden on top layer is reasonable.
2, adopt 20CrNi2Mo steel making fishing tool, simplification thermal treatment process can be reached, reduce heat treatment deformation and the object improving workpiece quality.
Novel material, novel process simplify thermal treatment process flow process, 20Cr2Ni4 steel heat treatment carburizing temperature is 890 DEG C-920 DEG C, carburizing time is 8-10 hour, 20CrNi2Mo steel heat treatment process carburizing temperature is 830 DEG C-860 DEG C, and carburizing time is 5-6 hour, adds appropriate rare earth and boron in carburization process, rare earth add crystallization furnace gas, reduce carburizing temperature, shorten overall carburizing time and carburizing temperature, greatly reduce thermal treatment cost.Adding of boron, improve wear resistance, improve quality product.
20CrNi2Mo steel and new thermal treatment process combine, and meet the performance requriements of high strength fishing tool.20CrNi2Mo is high-quality, low-carbon (LC) medium alloy constructional steel, alloying element proportioning is good, smelting technology is excellent, the processing performance of 20CrNi2Mo and 20Cr2Ni4 steel has carried out Experimental comparison, 20CrNi2Mo substitutes 20Cr2Ni4 steel as high strength fishing tool material, reach simplification thermal treatment process, improve the object of workpiece quality.
Embodiment
Embodiment one, 20CrNi2Mo steel fishing tool thermal treatment process, it comprises the following steps:
1, be vented: machined shaping 20CrNi2Mo steel fishing tool 500 kilograms is put into cementing furnace, in penetration enhancer, add the rare earth of penetration enhancer weight 0.5% and the boron of 0.25%, to vacuumizing and exhausting in body of heater simultaneously;
2, ooze by force: cementing furnace is heated to 830 DEG C-860 DEG C, be incubated and carburizing carried out to fishing tool in 5-6 hour;
3, spread: make fishing tool deposit in cementing furnace after being slowed down by penetration enhancer and make it spread in 2 hours;
4, quench: utilize hardening liquid directly to carry out quench treatment (hardening liquid is U.S. Houghton AQ364 hardening liquid) to the fishing tool after diffusion;
5, tempering: be placed in process furnace by the fishing tool after quenching and be heated to 180 DEG C-200 DEG C, insulation 3.5-4.5 hour, air cooling of coming out of the stove is to room temperature, and thermal treatment completes.
Embodiment two, 20CrNi2Mo steel fishing tool thermal treatment process, it comprises the following steps:
1, be vented: machined shaping 20CrNi2Mo steel fishing tool 500 kilograms is put into cementing furnace, in penetration enhancer, add the rare earth of penetration enhancer weight 0.5% and the boron of 0.25%, to vacuumizing and exhausting in body of heater simultaneously;
2, ooze by force: cementing furnace is heated to 840 DEG C, be incubated and carburizing carried out to fishing tool in 5.5 hours;
3, spread: after stopping Heat preservation, fishing tool is deposited in cementing furnace and make it spread in 2 hours;
4, quench: utilize hardening liquid directly to carry out quench treatment (hardening liquid is U.S. Houghton AQ364 hardening liquid) to the fishing tool after diffusion;
5, tempering: be placed in process furnace by the fishing tool after quenching and be heated to 180 DEG C, be incubated 4 hours, air cooling of coming out of the stove is to room temperature, and thermal treatment completes.
20Cr2Ni4 steel and 20CrNi2Mo steel contrast experiment:
20Cr2Ni4 and 20CrNi2Mo two kinds of steel that material provides for our company, material composition is as shown in table 1:
1, the thermal treatment of sample
Carry out in the heat treatment well type gas carbruizing furance of sample, carburizing temperature is 880 DEG C, carburizing time 10 hours.Air cooling after the carburizing of 20Cr2Ni4 steel, reheats 650 DEG C of high temperings, reheats to 820 DEG C of quenchings; Quenching after 830 DEG C-860 DEG C carburizing samming diffusions of 20CrNi2Mo steel, 180 DEG C of low-temperaturetemperings.
2, method for testing performance
After measuring low-temperaturetempering, the deflection of distortion sample break spacing, utilizes the effective hardness layer of hardness method test sample, measures remnants Austriaization body burden on sample top layer with X-ray diffraction collimation method.
3, experimental result and analysis
Heat treatment deformation results and analysis
The sample of two kinds of materials is as shown in table 2 at the deformation after Overheating Treatment:
As can be seen from Table 2, the quenching strain of 20CrNi2Mo steel is significantly less than 20Cr2Ni4.With regard to 20Cr2Ni4 carburizing and air cooling, deflection is very large, suitable with the quenching strain of 20CrNi2Mo steel, and heat treatment deformation is relevant with the intrinsic propesties of steel on the one hand.On the other hand also relevant with Heat Treatment Of Steel technique, in this test, the alloy content of 20Cr2Ni4 steel is many compared with 20CrNi2Mo steel, and greatly, when making thermal treatment, its structural stress be subject to and thermal stresses are all greater than 20CrNi2Mo steel to intensity.Basically will being inclined to than the distortion of 20Cr2Ni4 steel of 20Cr2Ni4 steel is large, and 20Cr2Ni4 steel heat treatment process comparatively 20CrNi2Mo steel is complicated, make heat treatment deformation serious equally, and during 20Cr2Ni4 steel heat treatment, high tempering is inevitable.Therefore little by the possibility of adjustment thermal treatment process reduction heat treatment deformation.
4, carburizing the performance test results is analyzed
20CrNi2Mo steel most surface carbon concentration is better than 20Cr2Ni4 steel as can be seen from the test results.20CrNi2Mo steel surface carbon concentration is high, causes because of alloys producing.Ni is the element that non-carbide is formed, and Mo is the element that carbide is formed, and the minimizing of Ni and the increase of Mo, make 20CrNi2Mo steel surface carbon concentration increase, and this illustrates that 20CrNi2Mo steel carburizing performance is better than 20Cr2Ni4 steel.
5, case-hardening aptitude tests interpretation of result
As can be seen from the test results, the microhardness of two kinds of steel and Hardness Distribution can be found out.20CrNi2Mo steel nitrided layer hardness is apparently higher than 20Cr2Ni4 steel.This illustrates that the case-hardening ability of 20CrNi2Mo steel is better than 20Cr2Ni4 steel.This is because the adding of Mo element in 20CrNi2Mo steel, Hardening Of Steel ability is enhanced.
6, the remaining Austriaization body burden test result in top layer and analysis
According to 20CrNi2Mo steel and 20Cr2Ni4 steel carburizing and quenching, low-temperaturetempering.The X-ray diffractogram on sample top layer, according to GB8362-87 recommend method, calculate 20CrNi2Mo steel, volume fraction is 12.8%; 20Cr2Ni4 steel volume fraction is 33.9%, and as can be seen from volume fraction, the remnants Austriaization body burden in 20Cr2Ni4 steel cementation zone is apparently higher than 20CrNi2Mo steel, and remaining Austriaization body is the important one-tenth phase in carburizing and quenching tissue.If the remnants Austriaization scale of construction in tissue is too much.Surface compress residual stresses then may be caused to decline, thus reduce fatigue strength and the wear resistance of fishing tool.But under the effect of load, can there is viscous deformation and the contact condition of tooth be improved in the remnants Austriaization body in steel.
Comprehensively think that remaining Austriaization body burden general control is advisable at 10%-25%.The remaining Austenitic steel content of cementation zone of 20CrNi2Mo steel is ideal, and 20Cr2Ni4 steel content is too much.Remnants Austriaization body burden in 20Cr2Ni4 steel is high, because the alloying element reducing Ms point containing a large amount of Cr, Ni etc. causes.Ms point reduces, and after steel is quenched, remaining Austriaization body burden declines.
Claims (4)
1.20CrNi2Mo steel fishing tool thermal treatment process, is characterized in that it comprises the following steps:
(1), exhaust: machined shaping 20CrNi2Mo steel fishing tool is put into cementing furnace, adds the rare earth of penetration enhancer weight 0.5% and the boron of 0.25% in penetration enhancer, to vacuumizing and exhausting in body of heater simultaneously;
(2), by force ooze: cementing furnace is heated to 830 DEG C-860 DEG C, be incubated and carburizing carried out to fishing tool in 5-6 hour;
Diffusion: make fishing tool deposit in cementing furnace after being slowed down by penetration enhancer and make it spread in 2 hours;
(4), quench: utilize hardening liquid directly to carry out quench treatment to the fishing tool after diffusion;
(5), tempering: be placed in process furnace by the fishing tool after quenching and be heated to 180 DEG C-200 DEG C, insulation 3.5-4.5 hour, air cooling of coming out of the stove is to room temperature, and thermal treatment completes.
2. 20CrNi2Mo steel fishing tool thermal treatment process as claimed in claim 1, is characterized in that described hardening liquid is PAG class hardening liquid.
3.20CrNi2Mo steel fishing tool thermal treatment process, it comprises the following steps:
(1), exhaust: machined shaping 20CrNi2Mo steel fishing tool is put into cementing furnace, adds the rare earth of penetration enhancer weight 0.5% and the boron of 0.25% in penetration enhancer, to vacuumizing and exhausting in body of heater simultaneously;
(2), by force ooze: cementing furnace is heated to 840 DEG C, be incubated and carburizing carried out to fishing tool in 5.5 hours;
(3), spread: make fishing tool deposit in cementing furnace after being slowed down by penetration enhancer and make it spread in 2 hours;
(4), quench: utilize hardening liquid directly to carry out quench treatment to the fishing tool after diffusion;
(5), tempering: be placed in process furnace by the fishing tool after quenching and be heated to 180 DEG C, be incubated 4 hours, air cooling of coming out of the stove is to room temperature, and thermal treatment completes.
4. 20CrNi2Mo steel fishing tool thermal treatment process as claimed in claim 3, is characterized in that described hardening liquid is PAG class hardening liquid.
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| CN201410662515.8A CN104404533A (en) | 2014-11-19 | 2014-11-19 | Heat treatment process for fishing tool made of 20CrNi2Mo steel |
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| CN201410662515.8A CN104404533A (en) | 2014-11-19 | 2014-11-19 | Heat treatment process for fishing tool made of 20CrNi2Mo steel |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110551967A (en) * | 2019-10-10 | 2019-12-10 | 吴江华宏真空科技有限公司 | rare earth catalytic infiltration process for improving workpiece heat treatment carburization speed |
| CN117448833A (en) * | 2023-10-26 | 2024-01-26 | 徐州巴特工程机械股份有限公司 | A carburizing and quenching strengthening process for 20Cr2Ni4 piston for hydraulic breakers |
| WO2024182379A1 (en) * | 2023-02-27 | 2024-09-06 | National Oilwell Varco, L.P. | Hardened grappling elements for retrieving downhole tools, grappling tool, method for manufacturing a grappling element of a grappling tool |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| WO2024182379A1 (en) * | 2023-02-27 | 2024-09-06 | National Oilwell Varco, L.P. | Hardened grappling elements for retrieving downhole tools, grappling tool, method for manufacturing a grappling element of a grappling tool |
| CN117448833A (en) * | 2023-10-26 | 2024-01-26 | 徐州巴特工程机械股份有限公司 | A carburizing and quenching strengthening process for 20Cr2Ni4 piston for hydraulic breakers |
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