CN104894485A - Production method of nuclear power plant used high-temperature-resisting brittleness-resisting seamless steel tube with outer diameter of more than 508mm - Google Patents
Production method of nuclear power plant used high-temperature-resisting brittleness-resisting seamless steel tube with outer diameter of more than 508mm Download PDFInfo
- Publication number
- CN104894485A CN104894485A CN201510268515.4A CN201510268515A CN104894485A CN 104894485 A CN104894485 A CN 104894485A CN 201510268515 A CN201510268515 A CN 201510268515A CN 104894485 A CN104894485 A CN 104894485A
- Authority
- CN
- China
- Prior art keywords
- temperature
- forging
- tube
- steel tube
- nuclear power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Heat Treatment Of Steel (AREA)
Abstract
The invention provides a production method of a nuclear power plant used high-temperature-resisting brittleness-resisting seamless steel tube with an outer diameter of more than 508mm. The method comprises the following steps that raw materials are prepared; the prepared raw materials of the seamless steel tube are subjected to die casting and round steel stock forging, the obtained stock is hot-rolled into a high precision semi-finished tube through the PQF three-roller retained mandrel tube rolling technology, and the semi-finished tub is hot-rolled into a finished tube through the skew-rolling spiral expanding technology. The production method has the beneficial effects that through two-time heating rolling, the needed large-diameter WB36CN1 seamless steel tube for the nuclear power station can reach the required physical dimension and precision; the produced tube is compact in texture, small in crystalline grain, excellent in low-temperature impact toughness and high-temperature strength and brittleness-resisting performance, meanwhile, high in production efficiency, small in metal consumption, and suitable for massive industrial production.
Description
Technical field
The present invention relates to the production method of the above used in nuclear power station weldless steel tube of a kind of high temperature resistant anti-brittle failure Φ 508mm, belong to weldless steel tube field.
Background technology
Along with the fast development of China's economy, supply of electric power day is becoming tight.While greatly developing advanced thermal power generating technology, nuclear power obtains as a kind of efficient, economic clean generation technology and payes attention to and greatly develop.Nuclear power station conventional island WB36CN1 nuclear power pipe, be applied to main steam system (VVP) steam-pipe and Feed Water Regulation System (ARE) feedwater piping etc. of nuclear power station conventional island part, the overwhelming majority is large-diameter steel pipe, because the flow velocity of its pipe in-vivo medium is high, flow large (being about 1.3 ~ 1.6 times of thermoelectricity) with the saturation steam of certain humidity, so flowing accelerated corrosion phenomenon (FAC) can be produced, therefore require Nuclear Power Station Service Pipes to have performance that accelerated corrosion is moved in anti-current.Due to very high to the security requirement of Nuclear power plants, absolutely not allow steam leakage occurs, so move accelerated corrosion performance requriements higher than thermal power station to the high temperature resistant anti-current of heavy caliber WB36CN1 seamless steel tube for nuclear power: under the condition of high temperature (200,300 and 400 DEG C) intensity level reaching regulation, not only have requirement to normal temperature impact property, but also the low-temperature impact toughness of p-20 DEG C and NDTT temperature etc. all there is strict regulation.Secondly, in order to ensure the security that Nuclear Power Station Service Pipes uses, the requirement harsher than the similar weldless steel tube of conventional boiler be it is also proposed to the surface quality of making WB36CN1 nuclear power pipe, geometrical dimension and tolerance etc.
At present, the main technique of domestic existing production heavy caliber class weldless steel tube has: large pipe pushing technology, secondary oblique rolling perforated process, Pilger pilger mill technique, drawing expander technique, pushing formula segmentation heat expand technique etc.Wherein: large pipe pushing technology is the technique of the most ancient production major-diameter thick-wall weldless steel tube, need system of repeatedly pushing up several times, and in also needing (boring, mill), (car, mill) surface working outward, but this technique is single process operation, production efficiency is low, and product geometric accuracy is poor; Pilger pilger mill technique hot rolling can produce used in nuclear power station weldless steel tube, but production efficiency is low, geometric accuracy and surface quality poor; The used in nuclear power station WB36CN1 weldless steel tube of domestic secondary cross piercing+expansion explained hereafter, the advantage of this technique is that Production Flow Chart is short, and shortcoming is that product geometrical dimension deviation is large, and due to amount of plastic deformation little, organize thick after thermal treatment, product low-temperature flexibility is poor.Although the used in nuclear power station heavy caliber seamless steel pipe surface quality of drawing expander manufacture technics is higher, can reach user's requirement, but due to every time expanding amount can not be too large, so production efficiency is low, and due to amount of plastic deformation little, organize thick after thermal treatment, product low-temperature flexibility is poor; Segmentation heat expands technique, and to be tube rolling expanding for base+zone heating push mode, and its production technique is easy, cost is low, but the geometric accuracy of steel pipe and outer surface quality level all poor.
In sum, existing technique is not well positioned to meet the requirement of Nuclear Power Station Service Pipes to high dimensional accuracy, high-level efficiency and high anti-brittle failure safety performance etc., the especially heavy caliber WB36CN1 used in nuclear power station weldless steel tube of external diameter 508 ~ 711mm, wall thickness 12 ~ 30mm.For solving the deficiency of existing heavy caliber WB36CN1 used in nuclear power station seamless steel tube production, be eager to research and develop a kind of production method of high temperature resistant brittle fracture resistance heavy caliber WB36CN1 used in nuclear power station weldless steel tube.
Summary of the invention
For deficiency structural in prior art, the object of this invention is to provide the production method of the above used in nuclear power station weldless steel tube of a kind of high temperature resistant anti-brittle failure Φ 508mm, thus the production realizing Φ 508mm above used in nuclear power station weldless steel tube can meet, and Nuclear Power Station Service Pipes is high temperature resistant, the requirement of high dimensional accuracy, high-level efficiency and high anti-brittle failure safety performance etc.
For achieving the above object, the technical solution used in the present invention is to provide the production method of the above used in nuclear power station weldless steel tube of a kind of high temperature resistant anti-brittle failure Φ 508mm, and the method comprises the following steps:
1) described in preparation of raw material, weldless steel tube chemical composition (weight percent) is: 0.12% ~ 0.19%C, 0.38% ~ 0.44%Si, 0.85% ~ 1.10%Mn, 0% ~ 0.010%P, 0% ~ 0.005%S, 0.15% ~ 0.35%Cr, 1.15% ~ 1.30%Ni, 0.20% ~ 0.45%Mo, 0.50% ~ 0.63%Cu, 0.01% ~ 0.03%Nb, 0 ~ 0.04%Al, 0 ~ 0.010%N, all the other are iron and micro impurity element;
2) by by step 1) the weldless steel tube raw material prepared adopts die casting+forging round steel forging stock, PQF tri-roller retained mandrel continuously rolling process is rolled into high precision hollow forging and then adopt oblique milling to revolve expansion technique hollow forging is rolled into production tube operates according to the following steps:
(1) steel-making and die casting+forging steel billet steel-making adopt the smelting technology of electrosmelting+ladle refining+vacuum outgas, to reduce steel pipe component segregation, ensure the quality of nuclear power pipe, described steel billet adopts die casting+forging base, forging ratio is greater than 3, during die casting controls die casting teeming temperature at T
l+ 70 ~ 85 DEG C=1575 DEG C, after being molded into steel ingot, carry out forging base to steel ingot, initial forging temperature is 1150 ~ 1170 DEG C, and final forging temperature is>=850 DEG C, and forging rear annealing thermal treatment temp is≤700 DEG C;
(2) above-mentioned forging stock heats by rolling high precision hollow forging, Heating temperature 1290 DEG C, 4 ~ 6 hours heat-up times, forging stock after heating first on the Mannesmann piercing mill of 460PQF MPM tube rolling mill pierced billet become hollow billet, after hollow billet winding-up borax, send into five frame PQF continuous mills and carry out hot rolling, sizing, hollow forging geometrical dimension and the allowance control scope of hot rolling are: external diameter (D) 377 ~ 457mm, wall thickness (S) 25 ~ 45.4mm, length 8 ~ 12m, wall thickness (S) allowance control is at-5%S ~+12.5%S, external diameter (D) allowance control is at ± 1%D, ovality is not more than 80% of outer diameter tolerance,
(3) carry out subtracting the expanding rolling of wall, expansion and sizing after being rolled into the heating of QC hollow forging, hollow forging heating and temperature control is within the scope of 1150 DEG C ~ 1200 DEG C, and soaking time >=45min, begins to roll temperature 1200 DEG C, and finishing temperature ensures to be greater than 850 DEG C;
(4) production tube described in thermal treatment through quenching temperature be 890 DEG C ~ 920 DEG C, water-based hardening liquid cools, tempering temperature is 650 DEG C ~ 670 DEG C, air cooling carries out modified, or normalizing temperature is 950 DEG C ~ 970 DEG C, and to carry out normalizing+tempering temperature be 650 DEG C ~ 670 DEG C tempering heat treatment, obtains qualified finished product weldless steel tube after thermal treatment through reconditioning nondestructive testing.
Effect of the present invention uses this processing method to be in particular in: 1) by the reasonably optimizing of composition, first C content controls about 0.12% ~ 0.19%, secondly by the Cr of interpolation 0.15% ~ 0.35%, additionally by control Cu/Ni ratio, Cu is controlled control 1.15 ~ 1.30% at 0.50 ~ 0.63%, Ni.Substantially increase the comprehensive mechanical property of steel pipe; And adopt the technique of die casting+forging, produce satisfactory forging stock.2) in production heavy caliber WB36CN1 used in nuclear power station weldless steel tube, adopt two step tube rolling methods: first by 460PQF MPM tube rolling mill, forging stock is rolled into high precision hollow forging, and then by 720 oblique millings revolve expand unit hollow forging is rolled into production tube, and formulate rational heat treating regime, make steel pipe have the performances such as high strength, high temperature resistant, antiscour corrosion.3) not only product specification is large for the seamless steel tube for nuclear power produced of the present invention, and geometric accuracy is high, stable performance, production efficiency are high, is applicable to large industrial production.
Embodiment
The production method of the above used in nuclear power station weldless steel tube of high temperature resistant anti-brittle failure Φ 508mm of the present invention is illustrated in conjunction with the embodiments.
The present invention of the present invention is by chemical composition reasonably optimizing, first C content controls about 0.12% ~ 0.19%, and carbon content low like this can improve toughness and the ductility of material, and can improve the welding property of steel pipe, reduce center segregation, enable material resist acidic medium; Secondly by the Cr of interpolation 0.15% ~ 0.35%, the antiscour corrosive power of steel pipe is substantially increased; Additionally by control Cu/Ni ratio, Cu is controlled control 1.15 ~ 1.30% at 0.50 ~ 0.63%, Ni.Avoid in hot procedure and produce " hot-short " phenomenon, thus substantially increase the qualification rate of product; Mn is the alloying element that in WB36CN1, content is more.Although high Mn/C is favourable for raising yield strength and impelling strength, it easily forms segregation line, thus causes the ununiformity of microstructure and hardness, also unfavorable to anti-H 2 S performance, and therefore addition needs to limit to some extent.While the interpolation of Mo can make steel pipe have higher intensity, there is better toughness.The weight percent of its material is: 0.12% ~ 0.19%C, 0.38% ~ 0.44%Si, 0.85% ~ 1.10%Mn, 0% ~ 0.010%P, 0% ~ 0.005%S, 0.15% ~ 0.35%Cr, 1.15% ~ 1.30%Ni, 0.20% ~ 0.45%Mo, 0.50% ~ 0.63%Cu, 0.01% ~ 0.03%Nb, 0 ~ 0.04%Al, 0 ~ 0.010%N, all the other are iron and micro impurity element.
The production method of the above used in nuclear power station weldless steel tube of high temperature resistant anti-brittle failure Φ 508mm of the present invention, the method comprises the following steps:
1) described in preparation of raw material, weldless steel tube chemical composition (weight percent) is: 0.12% ~ 0.19%C, 0.38% ~ 0.44%Si, 0.85% ~ 1.10%Mn, 0% ~ 0.010%P, 0% ~ 0.005%S, 0.15% ~ 0.35%Cr, 1.15% ~ 1.30%Ni, 0.20% ~ 0.45%Mo, 0.50% ~ 0.63%Cu, 0.01% ~ 0.03%Nb, 0 ~ 0.04%Al, 0 ~ 0.010%N, all the other are iron and micro impurity element;
2) by by step 1) the weldless steel tube raw material prepared adopts die casting+forging round steel forging stock, PQF tri-roller retained mandrel continuously rolling process is rolled into high precision hollow forging and then adopt oblique milling to revolve expansion technique hollow forging is rolled into production tube operates according to the following steps:
(1) steel-making and die casting+forging steel billet steel-making adopt the smelting technology of electrosmelting+ladle refining+vacuum outgas, to reduce steel pipe component segregation, ensure the quality of nuclear power pipe, described steel billet adopts die casting+forging base, forging ratio is greater than 3, during die casting controls die casting teeming temperature at T
l+ 70 ~ 85 DEG C=1575 DEG C, after being molded into steel ingot, carry out forging base to steel ingot, initial forging temperature is 1150 ~ 1170 DEG C, and final forging temperature is>=850 DEG C, and forging rear annealing thermal treatment temp is≤700 DEG C;
(2) above-mentioned forging stock heats by rolling high precision hollow forging, Heating temperature 1290 DEG C, 4 ~ 6 hours heat-up times, forging stock after heating first on the Mannesmann piercing mill of 460PQF MPM tube rolling mill pierced billet become hollow billet, after hollow billet winding-up borax, send into five frame PQF continuous mills and carry out hot rolling, sizing, hollow forging geometrical dimension and the allowance control scope of hot rolling are: external diameter (D) 377 ~ 457mm, wall thickness (S) 25 ~ 45.4mm, length 8 ~ 12m, wall thickness (S) allowance control is at-5%S ~+12.5%S, external diameter (D) allowance control is at ± 1%D, ovality is not more than 80% of outer diameter tolerance,
(3) carry out subtracting the expanding rolling of wall, expansion and sizing after being rolled into the heating of QC hollow forging, hollow forging heating and temperature control is within the scope of 1150 DEG C ~ 1200 DEG C, and soaking time >=45min, begins to roll temperature 1200 DEG C, and finishing temperature ensures to be greater than 850 DEG C;
(4) production tube described in thermal treatment through quenching temperature be 890 DEG C ~ 920 DEG C, water-based hardening liquid cools, tempering temperature is 650 DEG C ~ 670 DEG C, air cooling carries out modified, or normalizing temperature is 950 DEG C ~ 970 DEG C, and to carry out normalizing+tempering temperature be 650 DEG C ~ 670 DEG C tempering heat treatment, obtains qualified finished product weldless steel tube after thermal treatment through reconditioning nondestructive testing.
Described finished product weldless steel tube characteristic is: external diameter (D) 508 ~ 711mm, wall thickness (S) is 12 ~ 30mm, length 6 ~ 12m, wall thickness (S) tolerance-10%S ~+12.5%S, external diameter (D) tolerance+1%, ovality is not more than 80% of outer diameter tolerance, and eccentricity is not more than 80% of wall thickness tolerance; Fished pipe metallographic structure is: tempering bainite+ferritic structure, and grain fineness number 7 ~ 10 grades; Mechanical Characteristics is: yield strength is not less than 440MPa, tensile strength 610 ~ 760MPa, unit elongation 19 ~ 27%, ductile-brittle transition temperature are-35 DEG C, NDTT temperature≤-10 DEG C.
The production method of the present invention the is high temperature resistant above used in nuclear power station weldless steel tube of anti-brittle failure Φ 508mm completes especially by following steps:
A () steel-making steel-making adopts the smelting technology of electrosmelting+ladle refining+vacuum outgas, raw material adopt be greater than 40% blast-melted+high-quality steel scrap, molten steel adds Si-Ca-Ba and ferro-aluminum carries out deoxidation treatment.And through LF refining+VD/RH vacuum-treat, add slag charge desulfurization in advance when refining (LF), and join silicon carbide slag making reduction as far as possible.By carrying out Calcium treatment after VD, reasonable, appropriate feeds calcium line, feeds calcium line: 160 ~ 284 meters/stove, not feeding precision, and after guaranteeing to feed calcium line, weak churning time is not less than 10min, and inclusion is fully floated, and stops later stage strong Argon and stirs to reduce Al
2o
3be mingled with.The VD stove refining vacuum tightness≤0.5 holder time, VD high vacuum time is no less than 10 minutes, reduces O, H gas content in steel, promotes the homogenizing of composition simultaneously; The content of strict control S, P and other harmful elements, by five-harmful elements overall control within 200ppm.
B () die casting+forge satisfactory forging stock: in order to reduce steel pipe component segregation, ensures the quality of nuclear power pipe, pipe adopts die casting+forging base, and forging ratio is greater than 3.Die casting teeming temperature is strictly controlled: T during die casting
l+ 70 ~ 85 DEG C=1575 DEG C.After being molded into ingot, forge steel ingot, strict control begins to forge and final forging temperature, initial forging temperature 1300 DEG C, and final forging temperature >=790 DEG C, ensure that forging ratio is greater than 3, optimize annealing heat treatment process of having no progeny, heat-treatment of annealing :≤700 DEG C, ensure forging stock quality.
(c) heating forging stock.Heating temperature 1290 DEG C, 4 ~ 6 hours heat-up times.Process furnace furnace control climate be micro-reducing atmosphere to reduce the oxidization burning loss of steel billet, strictly control heat-processed, ensure heating steel billet even.
(d) rolling high precision hollow forging.Forging stock after heating first on the Mannesmann piercing mill of 460PQF MPM tube rolling mill pierced billet become hollow billet, send into five frame PQF continuous mills and carry out hot rolling, sizing after hollow billet winding-up borax, be rolled into high precision hollow forging.Geometrical dimension and the allowance control scope of the hollow forging of hot rolling are: external diameter (D) 377 ~ 457mm, wall thickness (S) 25 ~ 45.4mm, length 8 ~ 12m, wall thickness (S) allowance control is at-5 ~+12.5%S, external diameter (D) allowance control is at ± 1%D, and ovality is not more than 80% of outer diameter tolerance.
E () is rolled into QC.Hollow forging is transported to 720 oblique millings and revolves expansion unit after non-destructive test(ing)(NDT) is qualified, carries out subtracting the expanding rolling of wall, expansion and sizing after heating.Hollow forging heating and temperature control is within the scope of 1150 DEG C ~ 1200 DEG C, and soaking time >=45min, process furnace furnace control climate is micro-reducing atmosphere.Sodium-chlor is sprayed to remove iron scale to its internal surface in top by rolling plug before hollow forging enters milling train.Cool to improve and improve interior outside face quality and geometric accuracy to rolling tool in course of hot rolling, begin to roll temperature 1200 DEG C, finishing temperature ensures to be greater than 850 DEG C.Fished pipe geometrical dimension after hot rolling and tolerance are: external diameter (D) 508 ~ 711mm, wall thickness (S) 12 ~ 30mm, length 6 ~ 12m, wall thickness (S) allowance control-10 ~+12.5%S, external diameter (D) tolerance+1%, ovality be not more than outer diameter tolerance 80%, eccentricity is not more than 80% of wall thickness tolerance.
(f) thermal treatment: this product is through quenching temperature: 890 DEG C ~ 920 DEG C, water-based hardening liquid cools, tempering temperature: 650 DEG C ~ 670 DEG C, air cooling, carry out modified, or normalizing+tempering, normalizing temperature: 950 DEG C ~ 970 DEG C, tempering temperature: 650 DEG C ~ 670 DEG C thermal treatments, tempering bainite+ferritic structure is obtained after thermal treatment, strict control content of pearlite in alloy, and grain fineness number 7 ~ 10 grades, its Mechanical Characteristics is: yield strength is not less than 440MPa, tensile strength 610 ~ 760MPa, unit elongation 19 ~ 27%, ductile-brittle transition temperature is-35 DEG C, NDTT temperature≤-10 DEG C.
Embodiment 1
1 for the concrete production technique of rolling Φ 711 × 21.50 is:
(1) pipe production technique: high-quality steel scrap+molten iron → EAF (100t UHP) → LF → VD → die casting → forging → annealing.The pipe of Φ 400 × 4750mm is cut into after forging stock is qualified on inspection.Finished product circle base specification is diameter of phi 400mm, length 4750mm; Pipe uniform composition, five-harmful elements overall control is within 200ppm.
(2) hollow forging rolling technology: forging stock heats at ring furnace, Heating temperature 1290 ± 10 DEG C, 5 hours heat-up times.Forging stock after heating first on the Mannesmann piercing mill of 460PQF MPM tube rolling mill pierced billet become hollow billet, send into five frame PQF continuous mills and carry out hot rolling, sizing after hollow billet winding-up borax, be rolled into high precision hollow forging and be of a size of Φ 457 × 45.40mm.
(3) mill product plumber skill: hollow forging is transported to 720 oblique millings and revolves expansion unit after non-destructive test(ing)(NDT) is qualified, carries out after heating subtracting the expanding rolling of wall, expansion and sizing.Hollow forging Heating temperature is at 1200 DEG C, and soaking time 50min, begins to roll temperature 1200 DEG C, finishing temperature 900 DEG C.
(4) thermal treatment process: this specification process for heat treatment of steel pipe is: 950 DEG C of normalizing insulations 30min+660 DEG C of tempering insulation 120min.
(5) heat-treated steel pipe follow-up processing flow: the water test → figuring of surface → UT (Ultrasonic Testing) → magnetic-particle inspection → artificial reinspection sprays mark → packaging warehouse-in.
2 fished pipe properties results
2.1 steel pipe chemical compositions, specification and deviation requirement and mechanical property requirements are respectively in table 1, table 2 and table 3.
The chemical composition (wt%) of table 1 production tube
| Numbering | C | Si | Mn | P | S | Cr | Ni | Cu | Mo | Nb | N | Al ges |
| 1 | 0.1 | 0.4 | 0.9 | 0.00 | 0.00 | 0.2 | 1.1 | 0.6 | 0.3 | 0.01 | 0.005 | 0.01 |
| 2 | 0.1 | 0.4 | 0.9 | 0.00 | 0.00 | 0.2 | 1.1 | 0.6 | 0.3 | 0.02 | 0.007 | 0.01 |
| 3 | 0.1 | 0.4 | 0.9 | 0.00 | 0.00 | 0.2 | 1.1 | 0.6 | 0.3 | 0.02 | 0.007 | 0.01 |
Table 2 steel pipe sizes is measured and deviation measured result
Table 3 mechanical property requirements
2.2 weldless steel tube high-temperature short delay stretching performances of the present invention see the following form 4
2.3 weldless steel tube brittle fracture resistances of the present invention
Adopt P3 sample (16 × 50 × 130mm), according to GB/T6803-1986 standard test, NDTT blow energy is 370J, and crack conditions sees the following form, visible NDTT=-65 DEG C.
Table 5 nil-ductility temperature
| Test temperature, DEG C | -40 | -55 | -60 | -65 | -70 | -75 | NDTT,℃ |
| Product actual measurement Ak value, J | 00 | 00 | 00 | × | × | —— | -65 |
note: 0---do not rupture, ×---fracture
2.4 brief summary
As can be seen from the above embodiments, used in nuclear power station weldless steel tube of the present invention stable performance, steel is pure, dimensional precision is high, and there is the high temperature tensile properties of good low temperature brittle fracture resistance and 200 DEG C, 300 DEG C, 400 DEG C, meet the product performance requirement of conventional island Nuclear power plants station alloy seamless steel pipe completely.
Claims (2)
1. a production method for the above used in nuclear power station weldless steel tube of high temperature resistant anti-brittle failure Φ 508mm, the method comprises the following steps:
1) described in preparation of raw material, weldless steel tube chemical composition (weight percent) is:
0.12% ~ 0.19%C, 0.38% ~ 0.44%Si, 0.85% ~ 1.10%Mn, 0% ~ 0.010%P, 0% ~ 0.005%S, 0.15% ~ 0.35%Cr, 1.15% ~ 1.30%Ni, 0.20% ~ 0.45%Mo, 0.50% ~ 0.63%Cu, 0.01% ~ 0.03%Nb, 0 ~ 0.04%Al, 0 ~ 0.010%N, all the other are iron and micro impurity element;
2) by by step 1) the weldless steel tube raw material prepared adopts die casting+forging round steel forging stock, PQF tri-roller retained mandrel continuously rolling process is rolled into high precision hollow forging, and then adopt oblique milling revolve expand technique hollow forging is rolled into production tube, according to the following steps operate:
(1) steel-making and die casting+forging steel billet steel-making adopt the smelting technology of electrosmelting+ladle refining+vacuum outgas, to reduce steel pipe component segregation, ensure the quality of nuclear power pipe, described steel billet adopts die casting+forging base, forging ratio is greater than 3, during die casting controls die casting teeming temperature at T
l+ 70 ~ 85 DEG C=1575 DEG C, after being molded into steel ingot, carry out forging base to steel ingot, initial forging temperature is 1150 ~ 1170 DEG C, and final forging temperature is>=850 DEG C, and forging rear annealing thermal treatment temp is≤700 DEG C;
(2) above-mentioned forging stock heats by rolling high precision hollow forging, Heating temperature 1290 DEG C, 4 ~ 6 hours heat-up times, forging stock after heating first on the Mannesmann piercing mill of 460PQF MPM tube rolling mill pierced billet become hollow billet, after hollow billet winding-up borax, send into five frame PQF continuous mills and carry out hot rolling, sizing, hollow forging geometrical dimension and the allowance control scope of hot rolling are: external diameter (D) 377 ~ 457mm, wall thickness (S) 25 ~ 45.4mm, length 8 ~ 12m, wall thickness (S) allowance control is at-5%S ~+12.5%S, external diameter (D) allowance control is at ± 1%D, ovality is not more than 80% of outer diameter tolerance,
(3) carry out subtracting the expanding rolling of wall, expansion and sizing after being rolled into the heating of QC hollow forging, hollow forging heating and temperature control is within the scope of 1150 DEG C ~ 1200 DEG C, and soaking time >=45min, begins to roll temperature 1200 DEG C, and finishing temperature ensures to be greater than 850 DEG C;
(4) production tube described in thermal treatment through quenching temperature be 890 DEG C ~ 920 DEG C, water-based hardening liquid cools, tempering temperature is 650 DEG C ~ 670 DEG C, air cooling carries out modified, or normalizing temperature is 950 DEG C ~ 970 DEG C, and to carry out normalizing+tempering temperature be 650 DEG C ~ 670 DEG C tempering heat treatment, obtains qualified finished product weldless steel tube after thermal treatment through reconditioning nondestructive testing.
2. the production method of the above used in nuclear power station weldless steel tube of high temperature resistant anti-brittle failure Φ 508mm according to claim 1, it is characterized in that: described finished product weldless steel tube characteristic is: external diameter (D) 508 ~ 711mm, wall thickness (S) is 12 ~ 30mm, length 6 ~ 12m, wall thickness (S) tolerance-10%S ~+12.5%S, external diameter (D) tolerance+1%, ovality is not more than 80% of outer diameter tolerance, and eccentricity is not more than 80% of wall thickness tolerance;
Fished pipe metallographic structure is: tempering bainite+ferritic structure, and grain fineness number 7 ~ 10 grades;
Mechanical Characteristics is: yield strength is not less than 440MPa, tensile strength 610 ~ 760MPa, unit elongation 19 ~ 27%, ductile-brittle transition temperature are-35 DEG C, NDTT temperature≤-10 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510268515.4A CN104894485A (en) | 2015-05-25 | 2015-05-25 | Production method of nuclear power plant used high-temperature-resisting brittleness-resisting seamless steel tube with outer diameter of more than 508mm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510268515.4A CN104894485A (en) | 2015-05-25 | 2015-05-25 | Production method of nuclear power plant used high-temperature-resisting brittleness-resisting seamless steel tube with outer diameter of more than 508mm |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104894485A true CN104894485A (en) | 2015-09-09 |
Family
ID=54027432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510268515.4A Pending CN104894485A (en) | 2015-05-25 | 2015-05-25 | Production method of nuclear power plant used high-temperature-resisting brittleness-resisting seamless steel tube with outer diameter of more than 508mm |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104894485A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105543705A (en) * | 2016-01-19 | 2016-05-04 | 天津钢管集团股份有限公司 | Manufacturing method for large-strain-resistant corrosion-resistant seamless line pipe for marine environment R-Lay laying |
| CN106399829A (en) * | 2016-10-13 | 2017-02-15 | 天津钢管集团股份有限公司 | High-strength high-toughness corrosion-resisting martensitic stainless steel oil well pipe and manufacturing method thereof |
| CN106756500A (en) * | 2016-12-26 | 2017-05-31 | 天津钢管集团股份有限公司 | High-intensity high-tenacity seamless steel pipe for gas cylinder and production method |
| CN108277435A (en) * | 2018-03-21 | 2018-07-13 | 包头钢铁（集团）有限责任公司 | A kind of anti-corrosion pressure-bearing seamless steel pipe and its production method |
| CN109930064A (en) * | 2019-03-11 | 2019-06-25 | 江苏利淮钢铁有限公司 | A kind of effective heat resisting steel of corrosion-resistant high-pressure boiler and its production method |
| JP2019525994A (en) * | 2016-07-13 | 2019-09-12 | ヴァローレック ドイチュラント ゲーエムベーハー | Microalloy steel and production method of the steel |
| CN110714166A (en) * | 2019-11-13 | 2020-01-21 | 无锡双马钻探工具有限公司 | Alloy steel and preparation method and application thereof |
| CN112238141A (en) * | 2020-09-29 | 2021-01-19 | 江苏天淮钢管有限公司 | Hot continuous rolling production method of 508 mm large-caliber extra-thick-wall seamless steel pipe |
| CN113528954A (en) * | 2021-06-29 | 2021-10-22 | 鞍钢股份有限公司 | Seamless steel tube for cold-drawing hydraulic cylinder and manufacturing method thereof |
| CN114425682A (en) * | 2021-12-08 | 2022-05-03 | 江苏新长江无缝钢管制造有限公司 | Manufacturing method of seamless steel pipe for smoke pipe |
| CN114522999A (en) * | 2022-02-17 | 2022-05-24 | 南京沃尔德特钢有限公司 | High-toughness chemical corrosion-resistant austenitic stainless steel pipe |
| CN116000574A (en) * | 2023-01-03 | 2023-04-25 | 张家港广大特材股份有限公司 | Manufacturing method of thin-wall cylinder blank, thin-wall cylinder blank and application |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007217783A (en) * | 2006-02-20 | 2007-08-30 | Nippon Steel Corp | High-strength low-alloy steel boiler tube for which heat-treatment is simplified and method of manufacturing the same |
| CN101769403A (en) * | 2009-12-23 | 2010-07-07 | 攀枝花新钢钒股份有限公司 | Seamless steel tube for nuclear power and production method thereof |
| CN102703831A (en) * | 2012-05-22 | 2012-10-03 | 内蒙古包钢钢联股份有限公司 | Cu-contained and Cr-controlled seamless steel tube for nuclear power station and production method for Cu-contained and Cr-controlled seamless steel tube |
| CN103924161A (en) * | 2014-04-21 | 2014-07-16 | 中广核工程有限公司 | Main steam and main water supply pipeline in a conventional island of nuclear power plants and preparation method thereof |
-
2015
- 2015-05-25 CN CN201510268515.4A patent/CN104894485A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007217783A (en) * | 2006-02-20 | 2007-08-30 | Nippon Steel Corp | High-strength low-alloy steel boiler tube for which heat-treatment is simplified and method of manufacturing the same |
| CN101769403A (en) * | 2009-12-23 | 2010-07-07 | 攀枝花新钢钒股份有限公司 | Seamless steel tube for nuclear power and production method thereof |
| CN102703831A (en) * | 2012-05-22 | 2012-10-03 | 内蒙古包钢钢联股份有限公司 | Cu-contained and Cr-controlled seamless steel tube for nuclear power station and production method for Cu-contained and Cr-controlled seamless steel tube |
| CN103924161A (en) * | 2014-04-21 | 2014-07-16 | 中广核工程有限公司 | Main steam and main water supply pipeline in a conventional island of nuclear power plants and preparation method thereof |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105543705A (en) * | 2016-01-19 | 2016-05-04 | 天津钢管集团股份有限公司 | Manufacturing method for large-strain-resistant corrosion-resistant seamless line pipe for marine environment R-Lay laying |
| JP2019525994A (en) * | 2016-07-13 | 2019-09-12 | ヴァローレック ドイチュラント ゲーエムベーハー | Microalloy steel and production method of the steel |
| JP7016345B2 (en) | 2016-07-13 | 2022-02-04 | ヴァローレック ドイチュラント ゲーエムベーハー | Microalloy steel and its steel production method |
| CN106399829A (en) * | 2016-10-13 | 2017-02-15 | 天津钢管集团股份有限公司 | High-strength high-toughness corrosion-resisting martensitic stainless steel oil well pipe and manufacturing method thereof |
| CN106399829B (en) * | 2016-10-13 | 2018-03-23 | 天津钢管集团股份有限公司 | The corrosion-resistant martensitic stain less steel oil well pipe of high-strength and high ductility and its manufacture method |
| CN106756500A (en) * | 2016-12-26 | 2017-05-31 | 天津钢管集团股份有限公司 | High-intensity high-tenacity seamless steel pipe for gas cylinder and production method |
| CN106756500B (en) * | 2016-12-26 | 2018-10-02 | 天津钢管集团股份有限公司 | High-intensity and high-tenacity seamless steel pipe for gas cylinder and production method |
| CN108277435A (en) * | 2018-03-21 | 2018-07-13 | 包头钢铁（集团）有限责任公司 | A kind of anti-corrosion pressure-bearing seamless steel pipe and its production method |
| CN109930064A (en) * | 2019-03-11 | 2019-06-25 | 江苏利淮钢铁有限公司 | A kind of effective heat resisting steel of corrosion-resistant high-pressure boiler and its production method |
| CN110714166A (en) * | 2019-11-13 | 2020-01-21 | 无锡双马钻探工具有限公司 | Alloy steel and preparation method and application thereof |
| CN110714166B (en) * | 2019-11-13 | 2021-11-16 | 无锡双马钻探工具有限公司 | Alloy steel and preparation method and application thereof |
| CN112238141A (en) * | 2020-09-29 | 2021-01-19 | 江苏天淮钢管有限公司 | Hot continuous rolling production method of 508 mm large-caliber extra-thick-wall seamless steel pipe |
| CN113528954A (en) * | 2021-06-29 | 2021-10-22 | 鞍钢股份有限公司 | Seamless steel tube for cold-drawing hydraulic cylinder and manufacturing method thereof |
| CN114425682A (en) * | 2021-12-08 | 2022-05-03 | 江苏新长江无缝钢管制造有限公司 | Manufacturing method of seamless steel pipe for smoke pipe |
| CN114425682B (en) * | 2021-12-08 | 2024-01-30 | 江苏新长江无缝钢管制造有限公司 | Manufacturing method of seamless steel tube for smoke tube |
| CN114522999A (en) * | 2022-02-17 | 2022-05-24 | 南京沃尔德特钢有限公司 | High-toughness chemical corrosion-resistant austenitic stainless steel pipe |
| CN114522999B (en) * | 2022-02-17 | 2024-05-10 | 南京沃尔德特钢有限公司 | High-toughness chemical corrosion-resistant austenitic stainless steel pipe |
| CN116000574A (en) * | 2023-01-03 | 2023-04-25 | 张家港广大特材股份有限公司 | Manufacturing method of thin-wall cylinder blank, thin-wall cylinder blank and application |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104894485A (en) | Production method of nuclear power plant used high-temperature-resisting brittleness-resisting seamless steel tube with outer diameter of more than 508mm | |
| CN102330030B (en) | Seamless steel pipe with diameter of between 559 and 711mm for vehicular high-pressure gas cylinder and production method thereof | |
| US11313005B2 (en) | Seamless steel pipe and method for producing the seamless steel pipe | |
| CN103084426B (en) | Manufacturing method of stainless steel special pipe for nuclear fusion reactor | |
| CN101623719B (en) | Method for manufacturing stainless steel heat transfer pipe of nuclear heat exchanger | |
| CN109500130B (en) | Manufacturing method of seamless steel tube with diameter of 920mm for long-tube trailer gas cylinder | |
| CN114352808B (en) | S32750 austenitic ferrite super duplex stainless steel seamless pipe for deep sea manifold and preparation process | |
| CN104073739A (en) | Heatproof stainless steel seamless steel pipe and manufacture method of stainless steel and seamless steel pipe | |
| CN104043672A (en) | Manufacturing method of high-quality P92 large-aperture thick-wall seamless steel pipe of ultra-supercritical unit | |
| CN107553074A (en) | The manufacture method of high-temperature heater UNSN08810 iron nickel base alloy large-calibre seamless tubing | |
| CN103741028B (en) | Low yield strength ratio low temperature weldless steel tube and production method thereof | |
| CN110306120B (en) | X80 steel grade D1422mm seamless bent pipe and manufacturing method thereof | |
| CN113802041B (en) | Manufacturing method of iron-nickel-based alloy seamless pipe applicable to advanced ultra-supercritical unit | |
| CN103484782A (en) | Method for manufacturing large-aperture high-strength gathering and transportation seamless steel tube for environment with high content of hydrogen sulfide | |
| CN110404972B (en) | Production method of seamless steel tube with diameter of 1422mm | |
| CN110538890B (en) | Manufacturing method of UNS 32906 seamless tube | |
| CN109396759B (en) | Forging-rolling combined manufacturing method for 980 steel large-diameter cylinder for deep submergence | |
| CN100408905C (en) | Manufacturing method of seamless steel pipe for pressure pipeline | |
| CN115074504B (en) | Manufacturing method of 630 ℃ ultra-supercritical unit G115 large-caliber thick-wall seamless steel tube | |
| CN105018836A (en) | Manufacturing method for precision seamless steel tube for drill rod of rotary drilling rig | |
| CN113862556B (en) | 4140 medium-thick-wall seamless steel pipe and production method thereof | |
| CN103981422B (en) | 825 alloy pipe big distortion techniques | |
| CN106222559A (en) | A kind of Novel ocean platform steel steel plate and production method thereof | |
| CN103121034B (en) | Super duplex stainless steel ingot hot working cogging method | |
| CN107419168A (en) | The X70 level pipeline seamless steel pipes and its production method of super-large diameter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150909 |