CN103555904B - Thermal treatment process capable of improving low-temperature impact work of ASTM508Gr2 steel - Google Patents
Thermal treatment process capable of improving low-temperature impact work of ASTM508Gr2 steel Download PDFInfo
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Abstract
The invention relates to a thermal treatment process capable of improving low-temperature impact work of ASTM508Gr2 steel. The thermal treatment process adopts a thermal treatment mode of normalization, quenching and tempering, and specifically comprises the following steps of: firstly, heating to be 640-660 DEG C, keeping the temperature, further raising the temperature to be 880-920 DEG C, keeping the temperature, and cooling down in a blowing mode; heating to be 640-660 DEG C, keeping the temperature, further raising the temperature to be 870-900 DEG C, keeping the temperature, rapidly reducing the temperature to be within 780-820 DEG C, keeping the temperature for 1-3 hours, discharging out of a furnace and quenching, wherein the quenching medium is water; heating to be 300-350 DEG C, keeping the temperature, further raising the temperature to be 670-690 DEG C, keeping the temperature, and cooling down by using #20 mechanical oil. Through normalization, alloy elements can be subjected to sufficient solid solution and homogenization, and crystal particles can be further fined; through quenching, the steel is subjected to sufficient austenization, and a small amount of fine and dispersed carbide is separated; through tempering, separation of the carbide along with the crystal is reduced, and the toughness of the steel is improved. The mechanical property of the ASTM508Gr2 steel which is treated by the thermal treatment process can be AKV average value (minus 40 DEG C) of 79J to 171J, the single minimum value is 57J to 167J, forge pieces which meet the technical requirements of maritime work products can be produced, and the production process is high in controllability.
Description
Technical field
The present invention relates to low-alloy high-strength Plate Production technical field, relate generally to a kind of thermal treatment process that can improve ASTM508Gr2 steel low-temperature impact work.
Background technology
ASTM A508 standard-required A
kV(4.4 DEG C) mean value>=41J, single value>=34J, this material is widely used in nuclear reactor pressure container forging.Because it has good obdurability, be progressively generalized to marine engineering equipment forging.And extreme severe cold weather considered by marine engineering equipment forging, environment for use is severe, and therefore require that impact test temperature is reduced to-40 DEG C by 4.4 DEG C, specific requirement is: A
kV(-40 DEG C) mean value>=41J, single value>=34J.Adopt conventional hardening and tempering method to be difficult to meet its low-temperature impact toughness, the composition proportion, heat treatment mode and the temperature that improve low-temperature impact toughness thermal treatment process must be adopted, make forging properties meet technical requirements.
Summary of the invention
The present invention is intended to reduce prototype steel grade manufacturing cost, and for the present situation of above-mentioned background technology, there is provided a kind of and there is tiny austenite structure, there are good corrosion resistance and good toughness, the thermal treatment process that can improve ASTM A508Gr.2 steel low-temperature impact work that marine engineering equipment product uses can be met.
The implementation of the object of the invention is to improve the thermal treatment process of ASTM508Gr.2 steel low-temperature impact work, the chemical composition (% of thermal treatment forging, wt, heat analysis) as follows: C:0.12% ~ 0.16%, Si:0.21% ~ 0.25%, Mn:0.71% ~ 0.85%, P≤0.010%, S≤0.010%, Cr:0.35% ~ 0.42%, Ni:0.84% ~ 0.93%, Mo:0.56% ~ 0.62%, V:0.03% ~ 0.04%, Cu≤0.20%;
Forging thermal treatment adopts the heat treatment mode of normalizing+quenching+tempering,
Normalizing: be first heated to 640 DEG C ~ 660 DEG C insulations 2 hours, then be incubated after being warmed up to 880 DEG C of-920 DEG C of sammings, soaking time is pressed 1.0h/100mm and calculated, and is cooled to room temperature, the normalizing type of cooling adopts air blast cooling;
Quenching: be first heated to 640 DEG C ~ 660 DEG C insulations 2 hours, then be incubated after being warmed up to 870 DEG C of-900 DEG C of sammings, soaking time is pressed 1.0h/100mm and calculated; Then make between temperature prompt drop to 780 DEG C ~ 820 DEG C, and quenching of coming out of the stove after being incubated 1 ~ 3 hour at such a temperature, quenchant is water, is cooled to less than 250 DEG C, cooling time 0.5h ~ 1h;
Tempering: first heat 300 DEG C ~ 350 DEG C and be incubated 2 hours, then be incubated after being warming up to 670 DEG C ~ 690 DEG C sammings, soaking time press 2.0h/100mm and is calculated, and heat-eliminating medium employing 20# machinery oil, is cooled to room temperature, cooling time 1h ~ 2h;
During normalizing of the present invention, temperature is high, and soaking time is long, can make the abundant solid solution of alloying element and homogenizing, further crystal grain thinning, uniform formation, for modified tissue of carrying out prepares.Quenching temperature is high, soaking time is long, make the abundant austenitizing of steel, be quickly cooled to the two-phase region between 780 DEG C ~ 820 DEG C subsequently again, quench after two-phase region held for some time, the carbide of micro-small and dispersed can be separated out, during tempering, can be used as the nucleus that carbide is separated out at intracrystalline after quenching, thus reduce carbide Intergranular precipitation, greatly improve the toughness of steel.
The ASTM A508Gr.2 steel mechanical property of process of the present invention is adopted to reach: R
m: 550MPa-725MPa, R
p0.2>=358.3MPa, A
4>=18%, Z>=38%, A
kV(-40 DEG C) mean value 79J ~ 171J, single value Schwellenwert 57J ~ 167J.
-40 DEG C of ballistic works that the present invention efficiently solves ASTM508Gr2 steel are difficult to a qualified difficult problem, produce the forging meeting marine engineering product technical requirements, and production process are by force handling.
Embodiment
Chemical composition (the % of forging of the present invention, wt, heat analysis) require as follows: C:0.12% ~ 0.16%, Si:0.17% ~ 0.37%, Mn:0.70% ~ 0.95%, P≤0.010%, S≤0.010%, Cr:0.35% ~ 0.45%, Ni:0.84% ~ 0.95%, Mo:0.56% ~ 0.65%, V:0.03% ~ 0.05, Cu≤0.20%.All the other elements meet standard and specify.
Forging thermal treatment adopts the heat treatment mode of normalizing+quenching+tempering,
Normalizing: be first heated to 640 DEG C ~ 660 DEG C insulations 2 hours, then be incubated after being warmed up to 880 DEG C of-920 DEG C of sammings, soaking time is pressed 1.0h/100mm and calculated, and is cooled to room temperature, the normalizing type of cooling adopts air blast cooling;
Quenching: be first heated to 640 DEG C ~ 660 DEG C insulations 2 hours, then be incubated after being warmed up to 870 DEG C of-900 DEG C of sammings, soaking time is pressed 1.0h/100mm and calculated; Then make the two-phase region between temperature prompt drop to 780 DEG C ~ 820 DEG C, and quenching of coming out of the stove after being incubated 1 ~ 3 hour at such a temperature, quenchant is water, is cooled to less than 250 DEG C, cooling time 0.5h ~ 1h.
Tempering: first heat 300 DEG C ~ 350 DEG C and be incubated 2 hours, then be incubated after being warming up to 670 DEG C ~ 690 DEG C sammings, soaking time press 2.0h/100mm and is calculated, and heat-eliminating medium employing 20# machinery oil, is cooled to room temperature, cooling time 1h ~ 2h.
The ASTM508Gr2 steel mechanical property of process of the present invention is adopted to reach: R
m: 550MPa-725MPa, R
p0.2>=358.3MPa, A
4>=18%, Z>=38%, A
kV(-40 DEG C) mean value 79J ~ 171J single value Schwellenwert 57J ~ 167J.
With specific embodiment in detail the present invention is described in detail below.
Embodiment 1:
The chemical composition (%, wt, heat analysis) of thermal treatment forging is as follows: C:0.16%, Si:0.25%, Mn:0.71%, P≤0.010%, S≤0.008%, Cr:0.37%, Ni:0.84%, Mo:0.56%, V:0.03%, Cu≤0.20%.
Forging thermal treatment adopts the heat treatment mode of normalizing+quenching+tempering,
Normalizing: be first heated to 650 DEG C of insulations 2 hours, then be incubated after being warmed up to 910 DEG C of sammings, soaking time is pressed 1.0h/100mm and calculated, and is cooled to room temperature, the normalizing type of cooling adopts air blast cooling.
Quenching: be first heated to 650 DEG C of insulations 2 hours, then be incubated after being warmed up to 880 DEG C of sammings, soaking time is pressed 1.0h/100mm and calculated; Then make temperature prompt drop to 800 DEG C, and be incubated quenching of coming out of the stove after 1 hour at such a temperature, quenchant is water, is cooled to less than 250 DEG C, cooling time 0.5h.
Tempering: first heat 330 DEG C and be incubated 2 hours, then be incubated after being warming up to 690 DEG C of sammings, soaking time press 2.0h/100mm and is calculated, and heat-eliminating medium employing 20# machinery oil, is cooled to room temperature, cooling time 1h.
The ASTM508Gr2 steel A of process
kV(-40 DEG C) mean value 79J, single value 57J.
Embodiment 2:
The chemical composition (%, wt, heat analysis) of thermal treatment forging is as follows: C:0.13%, Si:0.28%, Mn:0.73%, P≤0.010%, S≤0.008%, Cr:0.35%, Ni:0.85%, Mo:0.58%, V:0.03%, Cu≤0.20%.
Thermal treatment adopts the heat treatment mode of normalizing+quenching+tempering,
Normalizing: be first heated to 650 DEG C of insulations 2 hours, then be incubated after being warmed up to 880 DEG C of sammings, soaking time is pressed 1.0h/100mm and calculated, and is cooled to room temperature, the normalizing type of cooling adopts air blast cooling.
Quenching: be first heated to 650 DEG C of insulations 2 hours, then be incubated after being warmed up to 900 DEG C of sammings, soaking time is pressed 1.0h/100mm and calculated; Then make temperature prompt drop to 810 DEG C, and be incubated quenching of coming out of the stove after 3 hours at such a temperature, quenchant is water, is cooled to less than 250 DEG C, cooling time 1h.
Tempering: first heat 350 DEG C and be incubated 2 hours, then be incubated after being warming up to 680 DEG C of sammings, soaking time press 2.0h/100mm and is calculated, and heat-eliminating medium employing 20# machinery oil, is cooled to room temperature, cooling time 2h.
The ASTM508Gr2 steel A of process
kV(-40 DEG C) mean value 110J, single value 96J.
Embodiment 3: the chemical composition (%, wt, heat analysis) of thermal treatment forging is as follows: C:0.12%, Si:0.28%, Mn:0.80%, P≤0.010%, S≤0.008%, Cr:0.40%, Ni:0.93%, Mo:0.58%, V:0.03%, Cu≤0.20%.
Thermal treatment adopts the heat treatment mode of normalizing+quenching+tempering,
Normalizing: be first heated to 660 DEG C of insulations 2 hours, then be incubated after being warmed up to 900 DEG C of sammings, soaking time is pressed 1.0h/100mm and calculated, and is cooled to room temperature, the normalizing type of cooling adopts air blast cooling.
Quenching: be first heated to 660 DEG C of insulations 2 hours, then be incubated after being warmed up to 870 DEG C of sammings, soaking time is pressed 1.0h/100mm and calculated; Then make temperature prompt drop to 810 DEG C, and be incubated quenching of coming out of the stove after 2 hours at such a temperature, quenchant is water, is cooled to less than 250 DEG C, cooling time 1h.
Tempering: first heat 340 DEG C and be incubated 2 hours, then be incubated after being warming up to 685 DEG C of sammings, soaking time press 2.0h/100mm and is calculated, and heat-eliminating medium employing 20# machinery oil, is cooled to room temperature, cooling time 1h.
The ASTM508Gr2 steel A of process
kV(-40 DEG C) mean value 144J, single value 110J.
Embodiment 4: the chemical composition (%, wt, heat analysis) of thermal treatment forging is as follows: C:0.15%, Si:0.21%, Mn:0.75%, P≤0.010%, S≤0.008%, Cr:0.39%, Ni:0.89%, Mo:0.60%, V:0.04%, Cu≤0.20%.
Thermal treatment adopts the heat treatment mode of normalizing+quenching+tempering,
Normalizing: be first heated to 660 DEG C of insulations 2 hours, then be incubated after being warmed up to 900 DEG C of sammings, soaking time is pressed 1.0h/100mm and calculated, and is cooled to room temperature, the normalizing type of cooling adopts air blast cooling.
Quenching: be first heated to 660 DEG C of insulations 2 hours, then be incubated after being warmed up to 880 DEG C of sammings, soaking time is pressed 1.0h/100mm and calculated; Then make temperature prompt drop to 800 DEG C, and be incubated quenching of coming out of the stove after 2 hours at such a temperature, quenchant is water, is cooled to less than 250 DEG C, cooling time 1h.
Tempering: first heat 340 DEG C and be incubated 2 hours, then be incubated after being warming up to 680 DEG C of sammings, soaking time press 2.0h/100mm and is calculated, and heat-eliminating medium employing 20# machinery oil, is cooled to room temperature, cooling time 1h.
The ASTM508Gr2 steel A of process
kV(-40 DEG C) mean value 171J, single value 167J.
Embodiment 5: the chemical composition (%, wt, heat analysis) of thermal treatment forging is as follows: C:0.14%, Si:0.27%, Mn:0.73%, P≤0.010%, S≤0.008%, Cr:0.36%, Ni:0.86%, Mo:0.58%, V:0.03%, Cu≤0.20%.
Thermal treatment adopts the heat treatment mode of normalizing+quenching+tempering,
Normalizing: be first heated to 660 DEG C of insulations 2 hours, then be incubated after being warmed up to 910 DEG C of sammings, soaking time is pressed 1.0h/100mm and calculated, and is cooled to room temperature, the normalizing type of cooling adopts air blast cooling.
Quenching: be first heated to 660 DEG C of insulations 2 hours, then be incubated after being warmed up to 890 DEG C of sammings, soaking time is pressed 1.0h/100mm and calculated; Then make temperature prompt drop to 805 DEG C, and be incubated quenching of coming out of the stove after 2 hours at such a temperature, quenchant is water, is cooled to less than 250 DEG C, cooling time 1h.
Tempering: first heat 340 DEG C and be incubated 2 hours, then be incubated after being warming up to 675 DEG C of sammings, soaking time press 2.0h/100mm and is calculated, and heat-eliminating medium employing 20# machinery oil, is cooled to room temperature, cooling time 1h.
The ASTM508Gr2 steel A of process
kV(-40 DEG C) mean value 164J, single value 123J.
Claims (1)
1. the thermal treatment process of ASTM508Gr2 steel low-temperature impact work be can improve, chemical composition (%, the wt of thermal treatment forging it is characterized in that, heat analysis) as follows: C:0.12% ~ 0.16%, Si:0.21% ~ 0.25%, Mn:0.71% ~ 0.85%, P≤0.010%, S≤0.010%, Cr:0.35% ~ 0.42%, Ni:0.84% ~ 0.93%, Mo:0.56% ~ 0.62%, V:0.03% ~ 0.04%, Cu≤0.20%;
Forging thermal treatment adopts the heat treatment mode of normalizing+quenching+tempering, specific as follows:
Normalizing: be first heated to 640 DEG C ~ 660 DEG C insulations 2 hours, then be incubated after being warmed up to 880 DEG C of-920 DEG C of sammings, soaking time is pressed 1.0h/100mm and calculated, and is cooled to room temperature, the normalizing type of cooling adopts air blast cooling;
Quenching: be first heated to 640 DEG C ~ 660 DEG C insulations 2 hours, then be incubated after being warmed up to 870 DEG C of-900 DEG C of sammings, soaking time is pressed 1.0h/100mm and calculated; Then make between temperature prompt drop to 780 DEG C ~ 820 DEG C, and quenching of coming out of the stove after being incubated 1 ~ 3 hour at such a temperature, quenchant is water, is cooled to less than 250 DEG C, cooling time 0.5h ~ 1h;
Tempering: first heat 300 DEG C ~ 350 DEG C and be incubated 2 hours, then be incubated after being warming up to 670 DEG C ~ 690 DEG C sammings, soaking time press 2.0h/100mm and is calculated, and heat-eliminating medium employing 20# machinery oil, is cooled to room temperature, cooling time 1h ~ 2h.
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| CN105154652A (en) * | 2015-09-28 | 2015-12-16 | 共享铸钢有限公司 | Heat treatment method for improving mechanical property of rough and large polished blocker-type forged shaft |
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| CN108914003A (en) * | 2018-07-27 | 2018-11-30 | 武汉重工铸锻有限责任公司 | A kind of heat treatment method that can improve carbon manganese steel propeller shaft forging mechanical performance |
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