CN102212664B - Heat treatment method of stainless steel traction pin - Google Patents
Heat treatment method of stainless steel traction pin Download PDFInfo
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- CN102212664B CN102212664B CN2011101190334A CN201110119033A CN102212664B CN 102212664 B CN102212664 B CN 102212664B CN 2011101190334 A CN2011101190334 A CN 2011101190334A CN 201110119033 A CN201110119033 A CN 201110119033A CN 102212664 B CN102212664 B CN 102212664B
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Abstract
The invention discloses a heat treatment method of a stainless steel traction pin. The heat treatment method comprises a quenching and tempering process and a surface hardening process. The quenching and tempering process comprises the following steps: oil-quenching an annealed stainless steel traction pin at the temperature of 1000-1050 DEG C, and maintaining the temperature for 2-6 hours; and tempering at high temperature of 720-760 DEG C, maintaining the temperature for 4-8 hours, and then air-cooling. The surface hardening process comprises the following steps: carrying out high-frequency quenching by utilizing a heating ring-shaped inductor, and setting anode voltage to be 9-12KV and anode current to be 5-7.5A; and tempering at a low temperature of 150-250 DEG C, and then air-cooling. The heat treatment process provided by the invention has the beneficial effects that depth of a hardened layer is effectively controlled and hardness uniformity is ensured, thereby obviously improving the surface strength and wear resistance of the 9Cr18MoV traction pin and also improving the mechanical properties of the core part of the pin, and further enhancing the service performance of the traction pin.
Description
Technical field
The invention belongs to the metal heat treatmet technical field, be specifically related to the heat treating method of stainless steel towing pin in the electric locomotive.
Background technology
Towing pin is a strength member of electric locomotive, towing pin is in locomotive long-play process, because wearing and tearing appear in the effect of the power such as the rotation of towbar, phase mutual friction, impact, present pit or step, during serious corrosion can with the towbar locking, towing pin can't normally be dismantled and withdraw from when causing overhaul.
Traditional towing pin generally adopts the modified rear surface of medium carbon steel hardening treatment, and existence wears no resistance, the life-span is short and the deficiencies such as causing the dismounting difficulty that gets rusty easily.In order to improve the use properties of towing pin, the towing pin of novel high-power electric locomotive mainly adopts X90CrMoV18 stainless steel (trade mark 9Cr18MoV steel in the corresponding country) manufacturing, its chemical composition (massfraction) is: 0.94% C, 17.60% Cr, 1.26% Mo, 0.77% Si, 0.38% Mn, 0.12% V.The towing pin of relatively traditional mild steel material, the stainless steel towing pin has not only improved hardness requirement and depth requirements, when increasing wear resisting property, can also effectively solve the dismounting difficulty that causes after the towing pin corrosion.
Stainless thermal treatment can change its physicals, mechanical property, unrelieved stress and recover owing to processing in advance and be heated and receive the resistance to corrosion that has a strong impact on, thereby obtains stainless best use properties.It is many that published stainless steel hot is processed Patents in the prior art, as: patent of invention 200610030594.6 discloses a kind of high-strength stainless steel and heat treating method thereof, adopt first coil of strip to be vertically placed on and carry out anneal in the bell type annealing furnace, coil of strip is heated to 650～700 ℃ and be incubated 20～30 hours through integral body again, coil of strip is cooled to the furnace below 550 ℃, make it have higher yield strength and tensile strength; Patent of invention 200410066465.3 discloses the stainless softening annealing heat treating method for 1 of 1Cr17Ni2, and it adopts the secondary softening annealing process, has solved the shallow surface of cold drawn material appearance when cold-drawn and annealing and the technical problem of transverse corner crack; Patent of invention 200810010943.7 provides a kind of heat treating method of precipitation hardening of martensitic stainless steel FV 520 B, carries out the short period of time tempering at comparatively high temps first, takes afterwards the mode of Slow cooling, makes it have good toughness and intensity.
Because stainless thermal treatment more complicated need to be selected different heat treatment modes and parameter according to the characteristics of different steel grades, could satisfy the specific requirement of user.For the heat treating method of stainless steel towing pin in the electric locomotive, rarely have document open, be the conventional at present insoluble technical barrier of heat treating method.Zheng Ye sides etc. have delivered " discussion of locomotive stainless steel towing pin surface hardening process " (electric locomotive and city rail vehicle, the 5th phase of the 30th volume, on September 20th, 2007), explored multiple stainless steel towing pin surface hardening process, be the early stage disclosed paper of inventor herein, for definite the inventive method provides certain foundation, but and idiographic flow and the correlation parameter of unexposed heat treating method.
Summary of the invention
For the deficiency that exists on the prior art, the object of the invention is to provide a kind of stainless steel towing pin surface that makes to have high strength and good wear resistance, and heart section has higher intensity and toughness, the heat treating method of comprehensive mechanical property excellence.
To achieve these goals, the present invention realizes by the following technical solutions:
A kind of heat treating method of stainless steel towing pin comprises that modifier treatment and surface hardening process, and is described: modifier treatment is, at first annealed state stainless steel towing pin quenched, and quenching temperature is 1000～1050 ℃, and insulation 2～6h adopts oil quenching; Then carry out high tempering, tempering temperature is 720～760 ℃, insulation 4～8h, air cooling after the tempering;
Described surface hardening is treated to, and at first adopts hot type annulus inductor block to carry out high-frequency quenching, anode voltage 9～12KV is set, anodic current 5～7.5A; Then carry out low-temperaturetempering, tempering temperature is 150～250 ℃, air cooling after the tempering.
As preferably, the quenching temperature of described quenching link is 1000～1050 ℃, and soaking time is 3～5h.
As preferably, the tempering temperature of described high tempering link is 740～750 ℃, and soaking time is 5～6h.
As preferably, described high-frequency quenching link adopts pressurized gas/oily interrupted quenching cooling, anode voltage 10～12KV is set, anodic current 6～7.5A.
As preferably, adopt the pressurized air of 0.2～0.4MPa to carry out the laser heating quenching during heating, then immediately the stainless steel towing pin is put into oil and cool off.
As preferably, the tempering temperature of described low-temperaturetempering link is 200～250 ℃.
Product performance index is as follows after adopting the inventive method thermal treatment:
1, modified rear performance index are as follows: 1) tensile strength 〉=770MPa; 2) yield strength 〉=530MPa; 3) Impact energy Ak u2 〉=13J; 4) hardness 240-300HB.
2, performance refers to as follows after the surface hardening: 1) surface hardness 500-600HV; 2) depth of hardening zone Rht400=0.8+0.8.
The invention has the beneficial effects as follows:
Compared with prior art, the heat treating method that thermal treatment process of the present invention adopts modified+surface hardening to process, can effectively control case depth and guarantee the homogeneity of hardness, 9Cr18MoV towing pin surface strength and wear resistance have been significantly improved, simultaneously improve again the mechanical property of heart section, thereby improved the use properties of towing pin.
Figure of description
Fig. 1: stainless steel towing pin top layer metallograph;
Fig. 2: stainless steel towing pin heart section metallograph.
Embodiment
Understand for making the present invention be easy to understand, be illustrated below by embodiment.
Embodiment 1:
X90CrMoV18 stainless steel towing pin chemical composition (massfraction) is: 0.94% C, 17.60% Cr, 1.26% Mo, 0.77% Si, 0.38% Mn, 0.12% V.
Modifier treatment: 1030 ℃ of quenching temperatures, be incubated after 2 hours and quench, quenchant is oil, then carries out tempering, and tempering temperature is 740 ℃, and soaking time is 5 hours.
Carry out precision work (or semi-finishing) after modified the finishing, then carry out surface hardening and process.Adopt hot type annulus inductor block to carry out high-frequency quenching, gap between inductor block and the workpiece is 1～3mm, high-frequency parameter is set, anode voltage 10KV, anodic current 6A, mode by laser heating cooling is quenched, and adopts the 0.4MPa high-pressure air to cool off continuously to put into oil after heating is finished to cool off.Carry out at last tempering, 200 ℃ of tempering temperatures, air cooling after the tempering.
After adopting above technique to heat-treat, the towing pin surface has high strength and good wear resistance, and heart section has higher intensity and toughness, obtains good comprehensive mechanical property.Performance perameter sees Table 1 after testing:
Table 1
Fig. 1 is stainless steel towing pin top layer metallograph, Fig. 2 is stainless steel towing pin heart section metallograph, metallographicobservation is found, after heat treatment, textura epidermoidea is the granular carbide that tiny tempering cryptocrystalline martensite, eutectic carbides and disperse distributes, the carbide particle is tiny, corner angle passivation and being evenly distributed, and this microstructure certainly will cause hardness higher, and wear resistance is very good; Towing pin heart section is sorbite, eutectic carbides and thin block carbide, and this has guaranteed that towing pin keeps certain obdurability in use.
Embodiment 2:
Modifier treatment: 1000 ℃ of quenching temperatures, be incubated after 3.5 hours and quench, quenchant is oil, then carries out tempering, and tempering temperature is 750 ℃, and soaking time is 5 hours.
Carry out precision work (or semi-finishing) after modified the finishing, then carry out surface hardening and process.Adopt hot type annulus inductor block to carry out high-frequency quenching, gap between inductor block and the workpiece is 1～3mm, high-frequency parameter is set, anode voltage 11KV, anodic current 7A, mode by laser heating cooling is quenched, and adopts the 0.3MPa high-pressure air to cool off continuously to put into oil after heating is finished to cool off.Carry out at last tempering, 200 ℃ of tempering temperatures, air cooling after the tempering.Performance perameter sees Table 2 after testing:
Table 2
Embodiment 3:
Modifier treatment: 1050 ℃ of quenching temperatures, be incubated after 5 hours and quench, quenchant is oil, then carries out tempering, and tempering temperature is 740 ℃, and soaking time is 5 hours.
Carry out precision work (or semi-finishing) after modified the finishing, then carry out surface hardening and process.Adopt hot type annulus inductor block to carry out high-frequency quenching, gap between inductor block and the workpiece is 1～3mm, high-frequency parameter is set, anode voltage 12KV, anodic current 7.5A, mode by laser heating cooling is quenched, and adopts the 0.2MPa high-pressure air to cool off continuously to put into oil after heating is finished to cool off.Carry out at last tempering, 250 ℃ of tempering temperatures, air cooling after the tempering.Performance perameter sees Table 3 after testing:
Table 3
Above demonstration and described ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that describes in above-described embodiment and the specification sheets just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (6)
1. the heat treating method of a stainless steel towing pin, described stainless steel towing pin material is 9Cr18MoV, comprises that modifier treatment and surface hardening process, and it is characterized in that:
Described modifier treatment is, at first annealed state stainless steel towing pin quenched, and quenching temperature is 1000～1050 ℃, and insulation 2～6h adopts oil quenching; Then carry out high tempering, tempering temperature is 720～760 ℃, insulation 4～8h, air cooling after the tempering;
Described surface hardening is processed, and at first adopts hot type annulus inductor block to carry out high-frequency quenching, anode voltage 9～12KV is set, anodic current 5～7.5A; Then carry out low-temperaturetempering, tempering temperature is 150～250 ℃, air cooling after the tempering.
2. the heat treating method of a kind of stainless steel towing pin according to claim 1 is characterized in that, the quenching temperature of described quenching link is 1000～1050 ℃, and soaking time is 3～5h.
3. the heat treating method of a kind of stainless steel towing pin according to claim 1 is characterized in that, the tempering temperature of described high tempering link is 740～750 ℃, and soaking time is 5～6h.
4. the heat treating method of a kind of stainless steel towing pin according to claim 1 is characterized in that, described high-frequency quenching link adopts pressurized gas/oily interrupted quenching cooling, anode voltage 10～12KV is set, anodic current 6～7.5A.
5. the heat treating method of a kind of stainless steel towing pin according to claim 4 is characterized in that, adopts the pressurized air of 0.2～0.4MPa to carry out the laser heating quenching during heating, then immediately the stainless steel towing pin is put into oil and cools off.
6. the heat treating method of a kind of stainless steel towing pin according to claim 1 is characterized in that, the tempering temperature of described low-temperaturetempering link is 200～250 ℃.
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| CN103451402B (en) * | 2013-09-01 | 2015-04-22 | 株洲九方热表技术有限公司 | Heat treatment method of large shaft part |
| CN103484621A (en) * | 2013-09-26 | 2014-01-01 | 无锡阳工机械制造有限公司 | Heat treatment method for stainless steel |
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Effective date of registration: 20180726 Address after: 412005 Tianxin of Shi Feng District, Zhuzhou, Hunan Patentee after: Zhuzhou Zhongche Tianli Forging Industry Co. Ltd. Address before: 412001 Tianxin Zhuzhou electric locomotive factory, Shifeng District, Zhuzhou, Hunan Patentee before: Zhuzhou Jiufang Thermal Meter Technology Co., Ltd. |
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