CN103643126B - A kind of manufacture method of AISI4340 prestressed steel bar - Google Patents
A kind of manufacture method of AISI4340 prestressed steel bar Download PDFInfo
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- CN103643126B CN103643126B CN201310589388.9A CN201310589388A CN103643126B CN 103643126 B CN103643126 B CN 103643126B CN 201310589388 A CN201310589388 A CN 201310589388A CN 103643126 B CN103643126 B CN 103643126B
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Abstract
The invention discloses a kind of manufacture method of AISI4340 prestressed steel bar, with AISI4340MOD steel for blank, described blank is smelted also finish rolling and carry out the thermal treatment of expansion hydrogen, roughing, cold quenching and dry quenching successively to needing the prestressed steel bar forging stock of size, and rod iron forging stock outer surface polyethylene anticorrosion coating and polyethylene thermal shrinkable sleeve; The advantages such as the manufacture method intensity of a kind of AISI4340 prestressed steel bar designed by the present invention is high, ductility good, anti-delayed fracture resistance is strong, save steel, underrelaxation, easily welding, upsetting performance are good, and can greatly strengthen preserving and sealing, effectively improve physical strength.
Description
Technical field
The present invention relates to a kind of manufacture method of AISI4340 prestressed steel bar.
Background technology
In prior art, just now in material composition, the atom active of carbon and nitrogen element was lower, the air mass that each atom is formed can not form strong interaction with dislocation, extraneous without the need to providing larger stress just can start dislocation, thus make performance very unstable, simultaneously in rod iron forging stock, hydrogen richness is at more than 2.0ppm, and rod iron forging stock easily cracks thus brings out hydrogen induced cracking and hydrogen causes delay delayed fracture.
Generally single quenching mode is only adopted in prior art, so just can not prevent hardening break and the implosion of forging, carbide can not fully dissolve further simultaneously, cannot evenly spread, thus carbide can not be avoided to cause intergranular corrosion and spot corrosion to exceed standard in the precipitation of intergranular, smelt the technique effect that postheat treatment technique produces before have impact on.
The deformed bar outside that many offshore companies produce does not arrange any insulating protective layer mostly, the insulation in track plates between deformed bar is realized by insulating fastener, insulation effect is undesirable, though there is the way adopting and apply modifying asphalt on deformed bar, although coating modifying asphalt can improve the insulating corrosion performance of deformed bar, environmental pollution can be caused in construction process.
Summary of the invention
Technical problem to be solved by this invention is, overcome the shortcoming of prior art, advantages such as thering is provided that a kind of intensity is high, ductility good, anti-delayed fracture resistance is strong, save steel, underrelaxation, easily welding, upsetting performance are good, and greatly can strengthen the manufacture method of preserving and sealing, effectively the AISI4340 prestressed steel bar of raising physical strength.
In order to solve above technical problem, the invention provides a kind of manufacture method of AISI4340 prestressed steel bar, comprising the steps:
Step (1): with AISI4340MOD steel for blank, the component concentration of AISI4340MOD steel comprises each component of following mass percent: carbon: 0.3%-0.32%, silicon: 0.18%-0.36%, manganese: 0.50%-0.70%, chromium: 0.90%-1.10%, molybdenum: 0.20%-0.30%, phosphorus: 0-0.02%, sulphur: 0-0.025%, hydrogen: 0-1.8ppm, nickel: 0-0.40%, vanadium: 0-0.03%, copper: 0-0.30%, 0-0.9% residual element, and all the other are Fe;
Being smelted by blank also, finish rolling is to the prestressed steel bar forging stock needing size, and the temperature of smelting is 800 DEG C-850 DEG C;
Step (2): the thermal treatment of expansion hydrogen is carried out to the prestressed steel bar forging stock in step (1);
Step (3): roughing is carried out to the prestressed steel bar forging stock after expanding hydrogen thermal treatment in step (2), removes the casting skin on its surface, successively cold quenching and dry quenching are carried out to it;
Step (4): intercept the prestressed steel bar forging stock after the above-mentioned quench treatment of predetermined length, and the screw thread of predetermined length is offered at prestressed steel bar forging stock two ends, in the outer surface polyethylene anticorrosion coating of above-mentioned rod iron forging stock part between the screw thread of two ends, and carry out drying treatment, repeat above-mentioned coating/drying treatment process 2-4 time;
Step (5): at the outer sheathed polyethylene thermal shrinkable sleeve of aforementioned polyethylene anticorrosion coating, and make it heat to tighten up, repeat above-mentioned sheathed/heating tightening process 2-4 time, namely obtain prestressed steel bar.
The technical scheme that the present invention limits further is:
Further, the manufacture method of aforesaid a kind of AISI4340 prestressed steel bar, the component concentration of AISI4340MOD steel comprises each component of following mass percent, carbon: 0.3%, silicon: 0.18%, manganese: 0.50%, chromium: 0.90%, molybdenum: 0.20%, phosphorus: 0%, sulphur: 0%, hydrogen: 1.0ppm, nickel: 0%, vanadium: 0%, copper: 0-0.30%, 0-0.9% residual element, all the other are Fe.
The manufacture method of aforesaid a kind of AISI4340 prestressed steel bar, the component concentration of AISI4340MOD steel comprises each component of following mass percent, carbon: 0.32%, silicon: 0.36%, manganese: 0.70%, chromium: 1.10%, molybdenum: 0.30%, phosphorus: 0.02%, sulphur: 0.025%, hydrogen: 1.8ppm, nickel: 0.40%, vanadium: 0.03%, copper: 0.30%, 0-0.9% residual element, all the other are Fe.
The manufacture method of aforesaid a kind of AISI4340 prestressed steel bar, expand hydrogen thermal treatment in step (2) specifically to comprise: the prestressed steel bar forging stock that step (1) obtains is entered stove and is heated to 880 ± 10 DEG C and is incubated 360 minutes, air cooling to 300 ± 10 DEG C insulation 180 minutes, and then being heated to 600 ± 15 DEG C of insulations 650 minutes, stove is chilled to 360 ± 20 DEG C of air coolings of coming out of the stove.
The manufacture method of aforesaid a kind of AISI4340 prestressed steel bar, in step (3) the time t of water-cooled empirically formula press t=H*D calculating, wherein, low alloy steel coefficient H is 0.8-1.6s/mm, D is the diameter of prestressed steel bar forging stock, and the unit of D is mm, t is quench water cool time, the unit of t is second, and the time of dry quenching is 1/2 of the water cooling time.
The manufacture method of aforesaid a kind of AISI4340 prestressed steel bar, in step (4) after coating polyethylene corrosion protection coating, drying treatment is standing and drying process, and time of repose is 28 hours.
The manufacture method of aforesaid a kind of AISI4340 prestressed steel bar, first during described cold quenching process tests the water temperature lower than 36 DEG C.
The manufacture method of aforesaid a kind of AISI4340 prestressed steel bar, the multiplicity of coating/drying treatment is 3 times in step (4), sheathed in step (5)/multiplicity that heating is tightened up is 3 times.
The invention has the beneficial effects as follows:
Owing to adding silicon in material composition of the present invention: 0.18%-0.36%, manganese: 0.50%-0.70%, chromium: 0.90%-1.10%, thus the atom active of carbon and nitrogen element can be improved, the air mass that each atom is formed can form strong interaction with dislocation, pinning dislocation, produce yield point elongation, make to need the external world to provide larger stress just can start dislocation;
Expansion hydrogen thermal treatment in step of the present invention (2), ensure that rod iron forging stock hydrogen richness is under the prerequisite of below 2.0ppm, the content of reduction hydrogen further, prevents rod iron forging stock from producing Light spots crack and heat treatment stress brings out hydrogen induced cracking and hydrogen causes delay delayed fracture;
Described water-cooled/air cooling martemper technique is utilized to carry out in the process of Tempering and Quenching in step of the present invention (3), the water temperature of quenching during beginning is lower than 36 DEG C, by water-cooled/air cooling martemper, prevent hardening break and the implosion of forging to greatest extent, also obtain even tiny quenching simultaneously, reduce quenching temperature and can effectively prevent rod iron forging stock hardening crack to be inclined to;
Carbide can be made fully to dissolve further simultaneously, even diffusion, avoiding carbide causes intergranular corrosion and spot corrosion to exceed standard in the precipitation of intergranular, ensure that the ferrite content of material is about 35%, material solid solution can be made further abundant, avoid heat treatment mode heating uneven, the erosion rate that solid solution inequality is brought exceeds standard and hardness exceeds standard, and has consolidated the technique effect smelted postheat treatment technique above and produce;
The polyethylene anticorrosion technology used in the present invention is the most excellent technology of antiseptic property, at rod iron surface-coated three-layer polyethylene corrosion protection coating and sheathed three-layer polyethylene thermal shrinkable sleeve, can greatly strengthen preserving and sealing, effectively improve physical strength, and the water-repellancy of insulating corrosion prestressed steel bar that the method for the invention manufactures is strong, steady quality, easy construction, suitability are strong, free from environmental pollution;
The insulating corrosion prestressed steel bar utilizing the method for the invention to manufacture is in high speed railway fragments-free track slab; two to 4 layers of polyethylene corrosion protection coatings and two to the four layers of polyethylene thermal shrinkable sleeves on its surface serve provide protection to barred body; barred body and concrete railway board is made to have insulating effect; and the corrosion of energy acid-proof, salt; alkali, prevent barred body oxidation corrosion after a long time use, extend the work-ing life of track plates.
Embodiment
Embodiment 1
The manufacture method of a kind of AISI4340 prestressed steel bar that the present embodiment provides, comprises the steps:
Step (1): with AISI4340MOD steel for blank, the component concentration of AISI4340MOD steel comprises each component of following mass percent, carbon: 0.3%, silicon: 0.18%, manganese: 0.50%, chromium: 0.90%, molybdenum: 0.20%, phosphorus: 0%, sulphur: 0%, hydrogen: 1.0ppm, nickel: 0%, vanadium: 0%, copper: 0-0.30%, 0-0.9% residual element, all the other are Fe;
Being smelted by blank also, finish rolling is to the prestressed steel bar forging stock needing size, and the temperature of smelting is 800 DEG C;
Step (2): the prestressed steel bar forging stock that step (1) obtains is entered stove and is heated to 890 DEG C and is incubated 360 minutes, air cooling to 310 DEG C insulation 180 minutes, and then be heated to 615 DEG C of insulations 650 minutes, stove is chilled to 380 DEG C of air coolings of coming out of the stove;
Step (3): roughing is carried out to the prestressed steel bar forging stock after expanding hydrogen thermal treatment in step (2), remove the casting skin on its surface, successively cold quenching and dry quenching are carried out to it, wherein, the time t of water-cooled empirically formula presses t=H*D and calculates, wherein, the diameter of low alloy steel coefficient H to be 0.8-1.6s/mm, D be prestressed steel bar forging stock, the unit of D is mm, t is quench water cool time, and the unit of t is second, and the time of dry quenching is 1/2 of the water cooling time;
Step (4): intercept the prestressed steel bar forging stock after the above-mentioned quench treatment of predetermined length, and the screw thread of predetermined length is offered at prestressed steel bar forging stock two ends, in the outer surface polyethylene anticorrosion coating of above-mentioned rod iron forging stock part between the screw thread of two ends, and carry out drying treatment, repeat above-mentioned coating/drying treatment process 2 times, wherein, drying treatment is standing and drying process, and time of repose is 28 hours;
Step (5): at the outer sheathed polyethylene thermal shrinkable sleeve of aforementioned polyethylene anticorrosion coating, and make it heat to tighten up, repeat above-mentioned sheathed/heating tightening process 2 times, namely obtain prestressed steel bar.
Embodiment 2
The manufacture method of a kind of AISI4340 prestressed steel bar that the present embodiment provides, comprises the steps:
Step (1): with AISI4340MOD steel for blank, the component concentration of AISI4340MOD steel comprises each component of following mass percent, carbon: 0.32%, silicon: 0.36%, manganese: 0.70%, chromium: 1.10%, molybdenum: 0.30%, phosphorus: 0.02%, sulphur: 0.025%, hydrogen: 1.8ppm, nickel: 0.40%, vanadium: 0.03%, copper: 0.30%, 0-0.9% residual element, all the other are Fe;
Being smelted by blank also, finish rolling is to the prestressed steel bar forging stock needing size, and the temperature of smelting is 850 DEG C;
Step (2): the prestressed steel bar forging stock that step (1) obtains is entered stove and is heated to 870 DEG C and is incubated 360 minutes, air cooling to 290 DEG C insulation 180 minutes, and then be heated to 585 DEG C of insulations 650 minutes, stove is chilled to 340 DEG C of air coolings of coming out of the stove;
Step (3): roughing is carried out to the prestressed steel bar forging stock after expanding hydrogen thermal treatment in step (2), remove the casting skin on its surface, successively cold quenching and dry quenching are carried out to it, wherein, the time t of water-cooled empirically formula presses t=H*D and calculates, wherein, the diameter of low alloy steel coefficient H to be 0.8-1.6s/mm, D be prestressed steel bar forging stock, the unit of D is mm, t is quench water cool time, and the unit of t is second, and the time of dry quenching is 1/2 of the water cooling time;
Step (4): intercept the prestressed steel bar forging stock after the above-mentioned quench treatment of predetermined length, and the screw thread of predetermined length is offered at prestressed steel bar forging stock two ends, in the outer surface polyethylene anticorrosion coating of above-mentioned rod iron forging stock part between the screw thread of two ends, and carry out drying treatment, repeat above-mentioned coating/drying treatment process 4 times, wherein, drying treatment is standing and drying process, and time of repose is 28 hours;
Step (5): at the outer sheathed polyethylene thermal shrinkable sleeve of aforementioned polyethylene anticorrosion coating, and make it heat to tighten up, repeat above-mentioned sheathed/heating tightening process 4 times, namely obtain prestressed steel bar.
Embodiment 3
The manufacture method of a kind of AISI4340 prestressed steel bar that the present embodiment provides, comprises the steps:
Step (1): with AISI4340MOD steel for blank, the component concentration of AISI4340MOD steel comprises each component of following mass percent: carbon: 0.31%, silicon: 0.28%, manganese: 0.6%, chromium: 1%, molybdenum: 0.25%, phosphorus: 0.01%, sulphur: 0.02%, hydrogen: 1.6ppm, nickel: 0.30%, vanadium: 0.02%, copper: 0.20%, 0.8% residual element, and all the other are Fe;
Being smelted by blank also, finish rolling is to the prestressed steel bar forging stock needing size, and the temperature of smelting is 825 DEG C;
Step (2): the prestressed steel bar forging stock that step (1) obtains is entered stove and is heated to 880 DEG C and is incubated 360 minutes, air cooling to 300 DEG C insulation 180 minutes, and then be heated to 600 DEG C of insulations 650 minutes, stove is chilled to 360 DEG C of air coolings of coming out of the stove;
Step (3): roughing is carried out to the prestressed steel bar forging stock after expanding hydrogen thermal treatment in step (2), remove the casting skin on its surface, successively cold quenching and dry quenching are carried out to it, wherein, the time t of water-cooled empirically formula presses t=H*D and calculates, wherein, the diameter of low alloy steel coefficient H to be 0.8-1.6s/mm, D be prestressed steel bar forging stock, the unit of D is mm, t is quench water cool time, and the unit of t is second, and the time of dry quenching is 1/2 of the water cooling time;
Step (4): intercept the prestressed steel bar forging stock after the above-mentioned quench treatment of predetermined length, and the screw thread of predetermined length is offered at prestressed steel bar forging stock two ends, in the outer surface polyethylene anticorrosion coating of above-mentioned rod iron forging stock part between the screw thread of two ends, and carry out drying treatment, repeat above-mentioned coating/drying treatment process 3 times, wherein, drying treatment is standing and drying process, and time of repose is 28 hours;
Step (5): at the outer sheathed polyethylene thermal shrinkable sleeve of aforementioned polyethylene anticorrosion coating, and make it heat to tighten up, repeat above-mentioned sheathed/heating tightening process 3 times, namely obtain prestressed steel bar.
In addition to the implementation, the present invention can also have other embodiments, and all employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.
Claims (7)
1. a manufacture method for AISI4340 prestressed steel bar, is characterized in that, comprises the steps:
Step (1): with AISI4340MOD steel for blank, the component concentration of described AISI4340MOD steel comprises each component of following mass percent: carbon: 0.3%-0.32%, silicon: 0.18%-0.36%, manganese: 0.50%-0.70%, chromium: 0.90%-1.10%, molybdenum: 0.20%-0.30%, phosphorus: 0-0.02%, sulphur: 0-0.025%, hydrogen: 0-1.8ppm, nickel: 0-0.40%, vanadium: 0-0.03%, copper: 0-0.30%, 0-0.9% residual element, and all the other are Fe;
Being smelted by described blank also, finish rolling is to the prestressed steel bar forging stock needing size, and the temperature of described smelting is 800 DEG C-850 DEG C;
Step (2): the thermal treatment of expansion hydrogen is carried out to the prestressed steel bar forging stock in step (1), specifically comprise: the prestressed steel bar forging stock that step (1) obtains is entered stove and is heated to 880 ± 10 DEG C and is incubated 360 minutes, air cooling to 300 ± 10 DEG C insulation 180 minutes, and then being heated to 600 ± 15 DEG C of insulations 650 minutes, stove is chilled to 360 ± 20 DEG C of air coolings of coming out of the stove;
Step (3): roughing is carried out to the prestressed steel bar forging stock after expanding hydrogen thermal treatment in step (2), removes the casting skin on its surface, successively cold quenching and dry quenching are carried out to it;
Step (4): intercept the prestressed steel bar forging stock after the above-mentioned quench treatment of predetermined length, and the screw thread of predetermined length is offered at prestressed steel bar forging stock two ends, in the outer surface polyethylene anticorrosion coating of above-mentioned rod iron forging stock part between the screw thread of two ends, and carry out drying treatment, repeat above-mentioned coating/drying treatment process 2-4 time;
Step (5): at the outer sheathed polyethylene thermal shrinkable sleeve of aforementioned polyethylene anticorrosion coating, and make it heat to tighten up, repeat above-mentioned sheathed/heating tightening process 2-4 time, namely obtain prestressed steel bar.
2. the manufacture method of AISI4340 prestressed steel bar according to claim 1, is characterized in that:
The component concentration of described AISI4340MOD steel comprises each component of following mass percent, carbon: 0.3%, silicon: 0.18%, manganese: 0.50%, chromium: 0.90%, molybdenum: 0.20%, phosphorus: 0%, sulphur: 0%, hydrogen: 1.0ppm, nickel: 0%, vanadium: 0%, copper: 0-0.30%, 0-0.9% residual element, all the other are Fe.
3. the manufacture method of AISI4340 prestressed steel bar according to claim 1, is characterized in that:
The component concentration of described AISI4340MOD steel comprises each component of following mass percent, carbon: 0.32%, silicon: 0.36%, manganese: 0.70%, chromium: 1.10%, molybdenum: 0.30%, phosphorus: 0.02%, sulphur: 0.025%, hydrogen: 1.8ppm, nickel: 0.40%, vanadium: 0.03%, copper: 0.30%, 0-0.9% residual element, all the other are Fe.
4. the manufacture method of AISI4340 prestressed steel bar according to claim 1, is characterized in that:
In step (3) the time t of water-cooled empirically formula press t=H*D calculating, wherein, low alloy steel coefficient H is 0.8-1.6s/mm, D is the diameter of prestressed steel bar forging stock, the unit of D is mm, t is quench water cool time, and the unit of t is second, and the time of dry quenching is 1/2 of the water cooling time.
5. the manufacture method of AISI4340 prestressed steel bar according to claim 1, is characterized in that, in step (4) after coating polyethylene corrosion protection coating, drying treatment is standing and drying process, and time of repose is 28 hours.
6. the manufacture method of AISI4340 prestressed steel bar according to claim 1, is characterized in that, first during described cold quenching process tests the water temperature lower than 36 DEG C.
7. the manufacture method of AISI4340 prestressed steel bar according to claim 1, is characterized in that, the multiplicity of coating/drying treatment is 3 times in step (4), sheathed in step (5)/multiplicity that heating is tightened up is 3 times.
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| CN102181798A (en) * | 2011-04-07 | 2011-09-14 | 江苏天舜金属材料集团有限公司 | Processing method of high yield ratio and high plasticity steel product for prestressed concrete |
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