CN104818431A - Process for casting 650 DEG C high temperature resistant throttle valve - Google Patents

Abstract

The invention discloses a process for casting a 650 DEG C high temperature resistant throttle valve. The process includes the steps of smelting, refining, pouring and cast piece processing and checking, smelting includes that an electric-arc furnace or an induction furnace is used, and smelting temperature is 1300-1350 DEG C; refining includes that an LF furnace is used for refining, and refining temperature is 1380-1400 DEG C; pouring includes that argon shield die casting is performed at the temperature of 1100-1200 DEG C. According to the process for casting the 650 DEG C high temperature resistant throttle valve, the operation is simple, design is scientific, energy saving and environmental protection are achieved, and pollution is absent in the process.

Description

A kind of casting technique of resistance to 650 DEG C of high temperature throttling valve

Technical field

The invention belongs to technical field of hydraulic equipment, relate to a kind of hydraulic pressure fuel tap, particularly a kind of casting technique of resistance to 650 DEG C of high temperature throttling valve.

Background technology

Valve is function unit in pipeline fluid delivery system, and it is used to change path section and medium flowing direction, has the functions such as water conservancy diversion, cut-off, throttling, non-return, shunting or overflow release.In the technical support that valve is produced and researched and developed, state's inner valve falls behind unlike external valve, and products a lot of on the contrary can compare favourably with international business in technology and innovation, and the development of domestic valve industry moves ahead toward the direction of high-end modern.

Under industrialization, urbanization, reform and globalization four great promote, China's valve equipment manufacture prospect or broad, following valve industry high-endization, production domesticization, will be that valve industry will develop Main way from now at modernization.Pursue constantly innovation, for valve enterprise creates the market made new advances, enterprise could be allowed to seek survival in increasingly competitive pump valve industry spring tide, try for the development.Along with the development of valve gate technology, constantly widening of valve applications field, valve standard corresponding is with it also more and more indispensable.In the period of valve industry product introduction one innovation, not only product category needs to update, and enterprise internal management also needs to deepen reforms according to the standard of industry.Therefore, need, while fully using existing standard, to look forward to the future, work out and can apply to new standard in the future and new system, thus the development that propulsion valve technology is higher level.

Summary of the invention

Technical problem to be solved by this invention is, overcomes the shortcoming of prior art, and provide a kind of casting technique of resistance to 650 DEG C of high temperature throttling valve, present invention process is simple to operate, design science, and energy-conserving and environment-protective, technological process is pollution-free.

In order to solve above technical problem, the invention provides a kind of casting technique of resistance to 650 DEG C of high temperature throttling valve, processing step is: melting-refining-cast-foundry goods process and inspection, wherein:

Melting: adopt electric arc furnace or induction furnace, smelting temperature is 1300-1350 DEG C, chemical composition and the mass percent of the alloy billet selected are: B:0.55-0.65%, Cr:9.3-9.7%, Ni:1.2-1.4%, N:0.03-0.04%, C:0.03-0.05%, Mo:0.16-0.18%, Cu:0.66-0.70%, Al:0.24-0.26%, V:0.13-0.15%, W:0.01-0.02%, Si:0.33-0.36%, Mn:0.74-0.76%, Nb:0.09-0.13%, Ti:0.26-0.28%, S:0.01-0.02%, P:0.01-0.03%, all the other are Fe and inevitable impurity,

Refining: adopt the refining of LF stove, refining temperature is 1380-1400 DEG C, and the time is 30-50min, and omnidistance nitrogen blowing stirs, and then carry out degassed with vacuum degassing furnace, degassing temperature is 1510-1530 DEG C, vacuum tightness 30-45Pa, and pumpdown time is at 4-6h;

Cast: carry out argon shield die casting at the temperature of 1100-1200 DEG C, after solidifying, temperature is remained on 630-650 DEG C, soaking time is 22-28h, and last air cooling is to room temperature;

Foundry goods process and inspection: whether remove core and the ridge such as cast(ing) surface foreign matter, excision dead head, relief grinding burr and fash, detecting cast-internal has pore.

The invention has the beneficial effects as follows:

Containing a large amount of trace elements in the alloy billet that the present invention selects, wherein: carbon, yield-point and tensile strength is improved; Silicon, in steelmaking process, add silicon as reductive agent and reductor, can significantly improve the elastic limit of steel, yield-point and tensile strength, the combinations such as silicon and molybdenum, tungsten, chromium, are improved erosion resistance and oxidation resistant effect; Manganese, in steelmaking process, manganese is good reductor and sweetening agent, makes steel not only have enough toughness, and has higher intensity and hardness, improves the quenching property of steel, improves the hot workability of steel, improves wear resistance; Chromium, in structure iron and tool steel, chromium can significantly improve intensity, hardness and wear resistance, but reduces plasticity and toughness simultaneously, can also improve oxidation-resistance and the erosion resistance of steel; Nickel, nickel can improve the intensity of steel, and keeps good plasticity and toughness, has higher corrosion resistance to soda acid, at high temperature has antirust and temperature capacity; Molybdenum, can make the grain refining of steel, improves hardening capacity and thermostrength, keeps enough intensity and creep resisting ability when high temperature, improves mechanical property; Titanium, titanium is strong reductor in steel, can make the dense internal organization of steel, crystal grain thinning power, and reduce aging sensitivity and cold shortness, improving welding property, avoids intergranular corrosion; Vanadium, vanadium is the excellent reductor of steel, can thinning microstructure crystal grain, improves intensity and toughness, can improve resistant to hydrogen corrosive power at high temperature under high pressure; Tungsten, tungsten and carbon form wolfram varbide very high hardness and wear resistance; Niobium, niobium energy crystal grain thinning and reduce the superheated susceptivity of steel and temper brittleness, improves intensity, and can improve resistant to hydrogen, nitrogen, ammonia corrosion ability under weather-resistant and high temperature, improving welding property, prevents intergranular corrosion phenomenon simultaneously; Copper, can improve intensity and toughness, particularly atomospheric corrosion performance; Aluminium, aluminium is reductor conventional in steel, can crystal grain thinning, and improve impelling strength, also have oxidation-resistance and corrosion resistance, aluminium and chromium, silicon share, and can significantly improve the high temperature non-scale performance of steel and the ability of high-temperature corrosion resistance; Boron, the boron adding trace in steel can improve compactness and the hot rolling performance of steel, improves intensity; Nitrogen, nitrogen can improve the intensity of steel, low-temperature flexibility and weldability, increases aging sensitivity; Present invention process is simple to operate, design science, and energy-conserving and environment-protective, technological process is pollution-free.

Embodiment

embodiment 1

The present embodiment provides a kind of casting technique of resistance to 650 DEG C of high temperature throttling valve, and processing step is: melting-refining-cast-foundry goods process and inspection, wherein:

Melting: adopt electric arc furnace or induction furnace, smelting temperature is 1300 DEG C, and the chemical composition of the alloy billet of selection and mass percent are: B:0.55%, Cr:9.3%, Ni:1.2%, N:0.03%, C:0.03%, Mo:0.16%, Cu:0.66%, Al:0.24%, V:0.13%, W:0.01%, Si:0.33%, Mn:0.74%, Nb:0.09%, Ti:0.26%, S:0.01%, P:0.01%, all the other are Fe and inevitable impurity;

Refining: adopt the refining of LF stove, refining temperature is 1380 DEG C, and the time is 50min, and omnidistance nitrogen blowing stirs, and then carry out degassed with vacuum degassing furnace, degassing temperature is 1510 DEG C, vacuum tightness 30Pa, and pumpdown time is at 6h;

Cast: carry out argon shield die casting at the temperature of 1100 DEG C, after solidifying, temperature is remained on 630 DEG C, soaking time is 28h, and last air cooling is to room temperature;

Foundry goods process and inspection: whether remove core and the ridge such as cast(ing) surface foreign matter, excision dead head, relief grinding burr and fash, detecting cast-internal has pore.

embodiment 2

The present embodiment provides a kind of casting technique of resistance to 650 DEG C of high temperature throttling valve, and processing step is: melting-refining-cast-foundry goods process and inspection, wherein:

Melting: adopt electric arc furnace or induction furnace, smelting temperature is 1350 DEG C, and the chemical composition of the alloy billet of selection and mass percent are: B:0.65%, Cr:9.7%, Ni:1.4%, N:0.04%, C:0.05%, Mo:0.18%, Cu:0.70%, Al:0.26%, V:0.15%, W:0.02%, Si:0.36%, Mn:0.76%, Nb:0.13%, Ti:0.28%, S:0.02%, P:0.03%, all the other are Fe and inevitable impurity;

Refining: adopt the refining of LF stove, refining temperature is 1400 DEG C, and the time is 30min, and omnidistance nitrogen blowing stirs, and then carry out degassed with vacuum degassing furnace, degassing temperature is 1530 DEG C, vacuum tightness 45Pa, and pumpdown time is at 4h;

Cast: carry out argon shield die casting at the temperature of 1200 DEG C, after solidifying, temperature is remained on 650 DEG C, soaking time is 22h, and last air cooling is to room temperature;

Foundry goods process and inspection: whether remove core and the ridge such as cast(ing) surface foreign matter, excision dead head, relief grinding burr and fash, detecting cast-internal has pore.

embodiment 3

The present embodiment provides a kind of casting technique of resistance to 650 DEG C of high temperature throttling valve, and processing step is: melting-refining-cast-foundry goods process and inspection, wherein:

Melting: adopt electric arc furnace or induction furnace, smelting temperature is 1320 DEG C, and the chemical composition of the alloy billet of selection and mass percent are: B:0.60%, Cr:9.5%, Ni:1.3%, N:0.03%, C:0.04%, Mo:0.17%, Cu:0.68%, Al:0.25%, V:0.14%, W:0.02%, Si:0.34%, Mn:0.75%, Nb:0.11%, Ti:0.27%, S:0.01%, P:0.02%, all the other are Fe and inevitable impurity;

Refining: adopt the refining of LF stove, refining temperature is 1390 DEG C, and the time is 40min, and omnidistance nitrogen blowing stirs, and then carry out degassed with vacuum degassing furnace, degassing temperature is 1520 DEG C, vacuum tightness 42Pa, and pumpdown time is at 5h;

Cast: carry out argon shield die casting at the temperature of 1150 DEG C, after solidifying, temperature is remained on 640 DEG C, soaking time is 25h, and last air cooling is to room temperature;

Foundry goods process and inspection: whether remove core and the ridge such as cast(ing) surface foreign matter, excision dead head, relief grinding burr and fash, detecting cast-internal has pore.

Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.

Claims (4)

1. a casting technique for resistance to 650 DEG C of high temperature throttling valve, is characterized in that, processing step is: melting-refining-cast-foundry goods process and inspection, wherein:

Melting: adopt electric arc furnace or induction furnace, smelting temperature is 1300-1350 DEG C, chemical composition and the mass percent of the alloy billet selected are: B:0.55-0.65%, Cr:9.3-9.7%, Ni:1.2-1.4%, N:0.03-0.04%, C:0.03-0.05%, Mo:0.16-0.18%, Cu:0.66-0.70%, Al:0.24-0.26%, V:0.13-0.15%, W:0.01-0.02%, Si:0.33-0.36%, Mn:0.74-0.76%, Nb:0.09-0.13%, Ti:0.26-0.28%, S:0.01-0.02%, P:0.01-0.03%, all the other are Fe and inevitable impurity,

Refining: adopt the refining of LF stove, refining temperature is 1380-1400 DEG C, and the time is 30-50min, and omnidistance nitrogen blowing stirs, and then carry out degassed with vacuum degassing furnace, degassing temperature is 1510-1530 DEG C, vacuum tightness 30-45Pa, and pumpdown time is at 4-6h;

Cast: carry out argon shield die casting at the temperature of 1100-1200 DEG C, after solidifying, temperature is remained on 630-650 DEG C, soaking time is 22-28h, and last air cooling is to room temperature;

Foundry goods process and inspection: whether remove core and the ridge such as cast(ing) surface foreign matter, excision dead head, relief grinding burr and fash, detecting cast-internal has pore.

2. the casting technique of resistance to 650 DEG C of high temperature throttling valve according to claim 1, it is characterized in that, processing step is: melting-refining-cast-foundry goods process and inspection, wherein:

Melting: adopt electric arc furnace or induction furnace, smelting temperature is 1300 DEG C, and the chemical composition of the alloy billet of selection and mass percent are: B:0.55%, Cr:9.3%, Ni:1.2%, N:0.03%, C:0.03%, Mo:0.16%, Cu:0.66%, Al:0.24%, V:0.13%, W:0.01%, Si:0.33%, Mn:0.74%, Nb:0.09%, Ti:0.26%, S:0.01%, P:0.01%, all the other are Fe and inevitable impurity;

Refining: adopt the refining of LF stove, refining temperature is 1380 DEG C, and the time is 50min, and omnidistance nitrogen blowing stirs, and then carry out degassed with vacuum degassing furnace, degassing temperature is 1510 DEG C, vacuum tightness 30Pa, and pumpdown time is at 6h;

Cast: carry out argon shield die casting at the temperature of 1100 DEG C, after solidifying, temperature is remained on 630 DEG C, soaking time is 28h, and last air cooling is to room temperature;

Foundry goods process and inspection: whether remove core and the ridge such as cast(ing) surface foreign matter, excision dead head, relief grinding burr and fash, detecting cast-internal has pore.

3. the casting technique of resistance to 650 DEG C of high temperature throttling valve according to claim 1, it is characterized in that, processing step is: melting-refining-cast-foundry goods process and inspection, wherein:

Melting: adopt electric arc furnace or induction furnace, smelting temperature is 1350 DEG C, and the chemical composition of the alloy billet of selection and mass percent are: B:0.65%, Cr:9.7%, Ni:1.4%, N:0.04%, C:0.05%, Mo:0.18%, Cu:0.70%, Al:0.26%, V:0.15%, W:0.02%, Si:0.36%, Mn:0.76%, Nb:0.13%, Ti:0.28%, S:0.02%, P:0.03%, all the other are Fe and inevitable impurity;

Refining: adopt the refining of LF stove, refining temperature is 1400 DEG C, and the time is 30min, and omnidistance nitrogen blowing stirs, and then carry out degassed with vacuum degassing furnace, degassing temperature is 1530 DEG C, vacuum tightness 45Pa, and pumpdown time is at 4h;

Cast: carry out argon shield die casting at the temperature of 1200 DEG C, after solidifying, temperature is remained on 650 DEG C, soaking time is 22h, and last air cooling is to room temperature;

Foundry goods process and inspection: whether remove core and the ridge such as cast(ing) surface foreign matter, excision dead head, relief grinding burr and fash, detecting cast-internal has pore.

4. the casting technique of resistance to 650 DEG C of high temperature throttling valve according to claim 1, it is characterized in that, processing step is: melting-refining-cast-foundry goods process and inspection, wherein:

Melting: adopt electric arc furnace or induction furnace, smelting temperature is 1320 DEG C, and the chemical composition of the alloy billet of selection and mass percent are: B:0.60%, Cr:9.5%, Ni:1.3%, N:0.03%, C:0.04%, Mo:0.17%, Cu:0.68%, Al:0.25%, V:0.14%, W:0.02%, Si:0.34%, Mn:0.75%, Nb:0.11%, Ti:0.27%, S:0.01%, P:0.02%, all the other are Fe and inevitable impurity;

Refining: adopt the refining of LF stove, refining temperature is 1390 DEG C, and the time is 40min, and omnidistance nitrogen blowing stirs, and then carry out degassed with vacuum degassing furnace, degassing temperature is 1520 DEG C, vacuum tightness 42Pa, and pumpdown time is at 5h;

Cast: carry out argon shield die casting at the temperature of 1150 DEG C, after solidifying, temperature is remained on 640 DEG C, soaking time is 25h, and last air cooling is to room temperature;

Foundry goods process and inspection: whether remove core and the ridge such as cast(ing) surface foreign matter, excision dead head, relief grinding burr and fash, detecting cast-internal has pore.