CN105039863A - Manufacturing method of martensite stainless steel seamless tube for oil well - Google Patents
Manufacturing method of martensite stainless steel seamless tube for oil well Download PDFInfo
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- CN105039863A CN105039863A CN201510554117.9A CN201510554117A CN105039863A CN 105039863 A CN105039863 A CN 105039863A CN 201510554117 A CN201510554117 A CN 201510554117A CN 105039863 A CN105039863 A CN 105039863A
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Abstract
The invention relates to the field of martensite stainless steel, in particular to a manufacturing method of a martensite stainless steel seamless tube for an oil well. The manufacturing method is used for manufacturing the martensite stainless steel seamless tube by stainless steel with selected ingredients, the stainless steel with selected ingredients is processed into a tube blank which is then made into a steel tube through the extrusion method or the hot-puncturing method, and the obtained steel tube is subjected to annealing and tempering treatment to acquire the martensite stainless steel seamless tube end product for the oil well. The invention overcomes shortcomings in the background art, and provides the manufacturing method of the martensite stainless steel seamless tube for the oil well, and the martensite stainless steel seamless tube manufactured by the method can meet the requirements on both economy and corrosion resistance in the using environment of a deep-well oil and gas field.
Description
Technical field
The present invention relates to Martensite Stainless Steel field, specifically a kind of oil well martensitic stainless steel seamless pipe manufacture method.
Background technology
Along with the development of global economy, the demand of countries in the world to hydrocarbon resources constantly increases, and impels the oil-gas field of exploitation more and more darker, emerges the kill-job of a lot of ultra-deep superelevation.The difficulty of high pressure-temperature and the exploratory development of high pressure high temperature well increases suddenly, drilling well produced problem is got more and more, be mainly concerned with the series of problems such as the design of oil well, instrument, technique, equipment, well control, reservoir reconstruction, safety and material selection, wherein most critical is exactly the select permeability of material.
High pressure-temperature and high pressure high temperature well all contain CO usually
2, H
2s, Cl
-plasma, the CO that content is the highest
2content is more than 10%, H
2s is more than 60,000 ppm, Cl
-ion, more than 100,000 ppm, therefore corrodes and just becomes containing CO
2, H
2s and Cl
-environment in the subject matter that uses.Domestic and international for containing CO at present
2, H
2s and Cl
-material is adopted to be followed successively by Cr13 type Martensite Stainless Steel, duplex stainless steel and nickel-base alloy according to the severe degree of environment under oil well.The Cr13 type Martensite Stainless Steel use temperature limit is 150 DEG C, even more high-grade HP13Cr Martensite Stainless Steel, use temperature also only can improve about 20 DEG C, simultaneously at H
2be easy to produce spot corrosion and H under the environment that S exists
2s stress corrosion crack (SSC), simultaneously at high temperature height Cl
-easily go out to produce Cl under environment
-sSC, is difficult to meet the service requirements under existing harsh corrosive environment, has down-hole oil tube to rupture more, gas collecting main leakage accident occurs, cause many oil-gas field wells to be discarded in advance less than 1 year in operation, not only cause tremendous economic to lose, also threaten national energy strategic security simultaneously.For avoiding the corrosion of oil well pipe under exacting terms like this, anti-CO must be selected
2, H
2s and Cl
-the duplex stainless steel of corrosion and stress corrosion crack excellent property and nickel-base alloy, but its price is very expensive, and main dependence on import, make the input cost of construction oil well too high.
Summary of the invention
Technical problem to be solved by this invention is: how to overcome the deficiency in background technology, provides a kind of and can meet a kind of oil well martensitic stainless steel seamless pipe manufacture method economic anti-corrosion under deep-well oil-gas field environment for use.
The present invention says that the technical scheme of employing is: a kind of oil well martensitic stainless steel seamless pipe manufacture method, carry out step one in accordance with the following steps, smelt martensite steel ingot, according to mass percent in steel ingot: 0.005%≤C≤0.05%, 0.05%≤Si≤0.50%, 0.2%≤Mn≤1.0%, P≤0.04%, S≤0.005%, 15%≤Cr≤19%, 2.50%≤Ni≤6.00%, 1.50%≤Cu≤3.50%, 1.50%≤Mo≤4.00%, 0.01%≤Nb≤0.06%, 0.02%≤V≤0.20%, 0.01%≤N≤0.10%, all the other are Fe and inevitable impurity;
Step 2, be processed into pipe, steel ingot is become cogged ingot with blooming mill cogging after preheating in 1200 ~ 1280 DEG C of holding furnaces, at 1000 ~ 1250 DEG C of temperature, be forged into institute's bar with footpath forging machine through multiple passage, forging deformation amount is 20-30%, and peeling sawing becomes pipe;
Step 3, employing extrusion process or perforation Hot rolling make steel pipe;
Step 4, steel pipe is carried out quench treatment is heated to 850 ~ 1050 DEG C temperature 10 ~ 30min by steel pipe, room temperature is cooled to the speed of cooling faster than air cooling, steel pipe after quenching is then carried out tempering heat treatment and is namely heated to 450 ~ 650 DEG C of temperature 1 ~ 4 hour, be cooled to room temperature with speed more than air cooling.
As a kind of optimal way: in step one in steel ingot according to mass percent: 0.01%≤C≤0.02%, 0.1%≤Si≤0.3%, 0.2%≤Mn≤0.6%, P≤0.03%, S≤0.003%, 16%≤Cr≤18%, 3.50%≤Ni≤5.00%, 2.0%≤Cu≤3.0%, 2.0%≤Mo≤3.0%, 0.02%≤Nb≤0.04%, 0.05%≤V≤0.15%, 0.02%≤N≤0.05%, all the other are Fe and inevitable impurity.
As a kind of optimal way: the extrusion process in step 3 refers to: pipe to be adopted deep hole rig machining center through hole, an end face flat head chamfering processing hydraucone wherein, bell mouth angle is 33.5 ± 5 °; Pipe is carried out preheating, and heating furnace temperature is 950 DEG C ± 20 DEG C, and heat-up time is set as 4 ~ 8min/cm by pipe wall thickness, and soaking time is set as 1.0 ~ 1.5min/cm by pipe wall thickness; Join 1150 ~ 1200 DEG C and carry out reaming with tapping machine, pipe endoporus is expanded to the size being greater than production tube internal diameter, reaming speed is 200 ~ 220mm/s, be heated to the steel pipe that 1180 ~ 1250 DEG C of extrusion machines are squeezed into target size, extruding rate controls at 100 ~ 120mm/s, employing glass powder lubricates, and enters water and cool after extruding.
As a kind of optimal way: the perforation Hot rolling in step 3 refers to: pipe two ends are beaten centering sky, internal point external diameter is 40 ~ 80mm, and the degree of depth is 5 ~ 10mm.Require internal point bias≤0.3mm, fillet smoothly transits; Heated by pipe, Heating temperature is 1200 ~ 1280 DEG C, and heat-up time is set as 4 ~ 8min/cm by pipe wall thickness, and soaking time is set as 1.0 ~ 1.5min/cm by pipe wall thickness; Pipe after heating is delivered to tapping machine and is produced into hollow billet, roll is apart from being 70 ~ 120mm, and top head front-extending quantity is 50 ~ 70mm, and feed angle is 10 ~ 15 °; Hollow billet heat after hot piercing is delivered to Hot Rolling Mill carry out being rolled into hollow forging, hot rolling deformation amount is 50 ~ 60%, and finishing temperature control is more than 900 DEG C; Hollow forging heat after hot rolling is delivered to a tube reducing unit sizing to final size, water-cooled or air cooling are to room temperature.
The invention has the beneficial effects as follows: the invention provides a kind of for high concentration CO
2, H
2s and Cl
-the High Temperature High Pressure under corrosive environment of coexisting and a kind of oil well martensitic stainless steel seamless pipe manufacture method of ultrahigh-temperature Ultra High Pressure Deep Wells, its cost lower than duplex stainless steel and nickel-base alloy, at CO
2, H
2s and Cl
-the corrosion resistance nature coexisted under corrosive environment reaches same kind of products at abroad level, and work-ing life improves 2 to 3 times than original Cr13 shaped material.
Embodiment
Just Martensite Stainless Steel composition mechanism of the present invention is described below.
C is austenite former, and improve the content that C content can reduce austenite former Ni, thus reduce costs, C element can improve alloy strength simultaneously, and therefore C content should more than 0.005%.But C content raising can promote the precipitation of matrix carbon compound, when the C content of Martensite Stainless Steel is more than 0.05%, containing CO
2, H
2under the corrosive environments such as S, erosion resistance will significantly worsen, and C content increases the tempering sensitization that Ni causes simultaneously.Therefore, C content is defined as 0.005 ~ 0.05%.In addition, consider from the angle reducing Ni content, C content is more suitable more than 0.01%, and preferred scope is 0.01 ~ 0.02%.
Si adds as reductor when making steel, but can fall low-alloyed hot workability and toughness when addition is excessive, and limit Si content is 0 ~ 0.5% for this reason, and preferred content is 0.1 ~ 0.3%.
Mn forms austenitic element, can play the effect of deoxidation, desulfurization in smelting process, improves intensity and hot workability simultaneously.If content is very few, cannot have effect, if addition is excessive, can have influence on stainless toughness, the corrosion resisting property simultaneously under high temperature reduces.Therefore, in this stainless steel, the content range of Mn is 0.2 ~ 1.0%, and preferred content is 0.2 ~ 0.6%.
P is impurity, can reduce stainless steel at CO
2erosion resistance in environment and anticorrosion stress-resistant performance.Thus, P amount is less than 0.04%.Preferred content is less than 0.03%.
S in pipe and steel pipe manufacturing processed hot workability very unfavorable, thus S constituent content is defined as less than 0.005%, and preferred content is less than 0.003.
Cr can form oxide film on surface, is to guarantee containing CO
2, Cl
-, H
2erosion resistance under the harsh corrosive environment of S etc. and the necessary important element of anticorrosion stress-resistant cracking behavior, reach the effect of high-temperature corrosion resistance, the content of Cr must more than 15.00%, but after Cr content is more than 19%, ferrite content increases, hot workability sharply worsens, and intensity reduces simultaneously.Therefore, the content of Cr is defined as 13.00 ~ 19.00%, preferred scope is 16.00 ~ 18.00%.
Ni is the typical austenite former improving resistance to general corrosion, can improve the stability of protective membrane, improve at CO
2, Cl
-, H
2corrosion resistance nature in S environment and anticorrosion stress-resistant performance, just can play above-mentioned effect when addition is more than 2.5%, can improve residual austenite content during too high levels, reduces alloy strength, improve manufacturing cost simultaneously.Therefore, in the present invention, the content of Ni is 2.50% ~ 6.00%, and preferred content is 3.50% ~ 5.00%.
Cu the rich Cu phase of disperse educt can play the effect of precipitation strength in drawing process, can improve intensity, lie stiff like a corpse and can also reduce the corrosion speed of Martensite Stainless Steel.But Cu too high levels can significantly fall low-alloyed hot workability.Therefore the Cu content in the present invention is 1.50 ~ 3.50%, and preferred content is 2.00 ~ 3.00%.
Mo is a kind of ferrite former, under the prerequisite containing enough Cr, add corrosion resistance and anticorrosion stress-resistant performance that appropriate Mo can improve this Martensite Stainless Steel, above-mentioned effect is not had when content is below 1.5%, but when the content of Mo element is more than 4.0%, intensity can be reduced and increase cost simultaneously.Consider, in the present invention, the content of Mo is 1.50 ~ 4.00%, and preferred content is 2.00 ~ 3.00%.
Nb and V is carbide, the carbide of Cr can be suppressed to separate out at crystal boundary, play precipitation strength effect, form highdensity dislocation knot simultaneously, pinning effect is played to dislocation, reduce the Sensitivity of Stress Corrosion of Martensite Stainless Steel, but low-alloyed toughness and welding property can be fallen when two kinds of constituent contents are too high.Therefore, in the present invention, the content of Nb is 0.01 ~ 0.06%, and preferred scope is 0.02 ~ 0.04%; The content of V is 0.02 ~ 0.20%, and preferred scope is 0.05 ~ 0.15%.
N is austenite former, is a kind of element that can reduce Ni content.But when the content of N is more than 0.1%, toughness will worsen.Therefore, the N content in the present invention is defined as 0.01 ~ 0.1%, and preferred content is 0.02 ~ 0.05%.
The present embodiment manufacture be the oil well martensitic stainless steel seamless pipe of two kinds of specifications, specification is Ф 73.02*5.51mm and Ф 114.3*8.56mm.
Smelt martensite steel ingot, according to mass percent in steel ingot: C=0.01%, Si=0.20%, Mn=0.3%, P=0.015%, S=0.001%, Cr=17.20%, Ni=4.30%, Cu=2.40%, Mo=2.60%, Nb=0.03%, V=0.08%, N≤0.02%, all the other are Fe and inevitable impurity; Pretreated molten iron through top the end compound blow converter slightly refine with the decarburization of vacuum oxygen decarburization stove and ladle refining furnace refining after, the composition quality percentage ratio of molten steel reaches target call and namely taps, tap when ladle refining slag viscosity is 0.1 pool, temperature adjustment is to teeming temperature 1543 DEG C, then ladle handling is cast to mould note operation, tapping, mold casting of molten steel becomes 5.8 tons of steel ingots.Steel ingot specification is 500 × 650 × 2300mm.
Steel ingot carries out the heating of 12 hours in soaking pit, and Heating temperature is 1220 DEG C and ensure that steel ingot burning is all grilled thoroughly.The cogged ingot of 400*400mm is become through the cogging of Φ 1000mm blooming mill.In cogging process, finishing temperature is 1032 DEG C, rolls rear free of surface defects.After processing, cogged ingot is of a size of 400mm × 400mm × 3600mm.
Cogged ingot heating is delivered in gas heating furnace and is heated, heating and temperature control 1250 DEG C, total heat-up time be 6 hours 30 points, on 1800t footpath forging machine, Φ 239mm and Φ 230mm bar is forged into respectively through 5 passages after heating, forging deformation amount is 30%, final forging temperature is 1025 DEG C, Surface of Rod Bar no significant defect after forging.After being forged into bar, peeling sawing becomes to be of a size of the pipe of Φ 219mm × 800mm and Φ 210mm × 1200mm.
Extrusion process or perforation Hot rolling is adopted to make steel pipe
A extrusion process embodiment
According to final dimension specification Ф 73.02*5.51mm, deep hole rig is adopted to be processed into Ф 40mm central through hole Φ 219mm × 800mm pipe, an end face flat head chamfering processing hydraucone wherein, bell mouth angle is 33.5 °, and must not there be crackle, pit, casting skin in the pipe surface after machining, be mingled with.Pipe heats 3 little of 950 DEG C by ring furnace, heat-up time 80min; Soaking time 20min.After coming out of the stove, direct heat delivers to induction heater.By an induction heating to 1180 DEG C, heating zone heating power 700KW, insulation power 120KW.After overall homogeneous heating expand endoporus to Ф 60mm, reaming speed is 200mm/s.1230 DEG C are heated to, heating zone power heating power 380KW, insulation power 85KW by secondary induction line; Be squeezed into the steel pipe of Ф 73.02*5.51mm, extruding rate is 107mm/s, enters to be water-cooled to room temperature immediately.
B perforation Hot rolling embodiment
According to final dimension specification Ф 114.3*8.56mm, Φ 210mm × 1200mm pipe two ends are beaten centering sky, internal point external diameter is 50mm, the degree of depth is 6mm, delivers to ring furnace and heats, and Heating temperature is 1230 DEG C, heat-up time is 25min, and soaking time is 100min.
Pipe after heating is delivered to the hollow billet that tapping machine is produced into Φ 222*19mm, and roll is apart from being 80mm, and top head front-extending quantity is 60mm, and feed angle is 10 °.Hollow billet heat is delivered to the hollow forging that Hot Rolling Mill is rolled into Φ 180*8.5mm, and hot rolling deformation amount is 56%, and finishing temperature control is at 920 DEG C.Hollow forging heat after hot rolling is delivered to a tube reducing unit sizing by 10 passage sizings to trimmed size Ф 114.3*8.56mm, water-cooled, to room temperature, steel pipe samples, and utilizes metallography microscope sem observation microtexture after polish attack.
Steel pipe after hot-work is carried out quenching+tempering process: water-cooled after 980 DEG C of heating and thermal insulation 30min, then obtain production tube at 550 DEG C of heating and thermal insulation 4h air coolings.Steel pipe after heat treatment samples, after polish attack, utilizes metallography microscope sem observation microtexture.
The salient features of the present embodiment and the contrast of existing steel pipe are in Table.
| Contrast steel grade | Rp0.2，Mpa | Rm，Mpa | Hardness, HRC | Corrosion speed, mm/ |
| SUPER13Cr | ≥758 | ≥827 | ≤32 | ≤0.18 |
| Applicant's technical requirements | ≥820 | ≥900 | ≤37 | ≤0.12 |
| The present embodiment | 855 | 996 | 35 | 0.085 |
Can be seen by upper table, compared with traditional oil field Martensite Stainless Steel SUPER13Cr, test steel tensile strength and yield strength all higher than compared steel, containing CO
2and Cl
-erosion rate in environment is much smaller than compared steel, and its corrosion resistance nature is very outstanding, is suitable for high concentration CO
2, H
2s and Cl
-the deep-well coexisted under corrosive environment.
Claims (4)
1. an oil well martensitic stainless steel seamless pipe manufacture method, is characterized in that carrying out in accordance with the following steps:
Step one, smelting martensite steel ingot, according to mass percent in steel ingot: 0.005%≤C≤0.05%, 0.05%≤Si≤0.50%, 0.2%≤Mn≤1.0%, P≤0.04%, S≤0.005%, 15%≤Cr≤19%, 2.50%≤Ni≤6.00%, 1.50%≤Cu≤3.50%, 1.50%≤Mo≤4.00%, 0.01%≤Nb≤0.06%, 0.02%≤V≤0.20%, 0.01%≤N≤0.10%, all the other are Fe and inevitable impurity;
Step 2, be processed into pipe, steel ingot is become cogged ingot with blooming mill cogging after preheating in 1200 ~ 1280 DEG C of holding furnaces, at 1000 ~ 1250 DEG C of temperature, be forged into institute's bar with footpath forging machine through multiple passage, forging deformation amount is 20-30%, and peeling sawing becomes pipe;
Step 3, employing extrusion process or perforation Hot rolling make steel pipe;
Step 4, steel pipe is carried out quench treatment is heated to 850 ~ 1050 DEG C temperature 10 ~ 30min by steel pipe, room temperature is cooled to the speed of cooling faster than air cooling, steel pipe after quenching is then carried out tempering heat treatment and is namely heated to 450 ~ 650 DEG C of temperature 1 ~ 4 hour, be cooled to room temperature with speed more than air cooling.
2. a kind of oil well martensitic stainless steel seamless pipe manufacture method according to claim 1, its feature exists: in step one in steel ingot according to mass percent: 0.01%≤C≤0.02%, 0.1%≤Si≤0.3%, 0.2%≤Mn≤0.6%, P≤0.03%, S≤0.003%, 16%≤Cr≤18%, 3.50%≤Ni≤5.00%, 2.0%≤Cu≤3.0%, 2.0%≤Mo≤3.0%, 0.02%≤Nb≤0.04%, 0.05%≤V≤0.15%, 0.02%≤N≤0.05%, all the other are Fe and inevitable impurity.
3. according to claim 1 or a kind of oil well martensitic stainless steel seamless pipe manufacture method according to claim 2, it is characterized in that: the extrusion process in step 3 refers to: pipe is adopted deep hole rig machining center through hole, an end face flat head chamfering processing hydraucone wherein, bell mouth angle is 33.5 ± 5 °; Pipe is carried out preheating, and heating furnace temperature is 950 DEG C ± 20 DEG C, and heat-up time is set as 4 ~ 8min/cm by pipe wall thickness, and soaking time is set as 1.0 ~ 1.5min/cm by pipe wall thickness; Join 1150 ~ 1200 DEG C and carry out reaming with tapping machine, pipe endoporus is expanded to the size being greater than production tube internal diameter, reaming speed is 200 ~ 220mm/s, be heated to the steel pipe that 1180 ~ 1250 DEG C of extrusion machines are squeezed into target size, extruding rate controls at 100 ~ 120mm/s, employing glass powder lubricates, and enters water and cool after extruding.
4. according to claim 1 or a kind of oil well martensitic stainless steel seamless pipe manufacture method according to claim 2, it is characterized in that: the perforation Hot rolling in step 3 refers to: pipe two ends are beaten centering sky, internal point external diameter is 40 ~ 80mm, and the degree of depth is 5 ~ 10mm; Require internal point bias≤0.3mm, fillet smoothly transits; Heated by pipe, Heating temperature is 1200 ~ 1280 DEG C, and heat-up time is set as 4 ~ 8min/cm by pipe wall thickness, and soaking time is set as 1.0 ~ 1.5min/cm by pipe wall thickness; Pipe after heating is delivered to tapping machine and is produced into hollow billet, roll is apart from being 70 ~ 120mm, and top head front-extending quantity is 50 ~ 70mm, and feed angle is 10 ~ 15 °; Hollow billet heat after hot piercing is delivered to Hot Rolling Mill carry out being rolled into hollow forging, hot rolling deformation amount is 50 ~ 60%, and finishing temperature control is more than 900 DEG C; Hollow forging heat after hot rolling is delivered to a tube reducing unit sizing to final size, water-cooled or air cooling are to room temperature.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017050229A1 (en) * | 2015-09-24 | 2017-03-30 | 宝山钢铁股份有限公司 | Process for on-line quenching of seamless steel tube using waste heat and manufacturing method |
| CN108277438A (en) * | 2018-03-29 | 2018-07-13 | 太原钢铁(集团)有限公司 | Mo ultralow-carbon martensitic stainless steel seamless pipe and its manufacturing method |
| CN109513766A (en) * | 2018-11-15 | 2019-03-26 | 南通金尼新材料科技有限公司 | A kind of manufacturing method of high concentricity martensitic stainless steel seamless pipe material |
| CN109811252A (en) * | 2018-12-21 | 2019-05-28 | 江苏星火特钢有限公司 | A kind of high strength martensitic stainless steel and its manufacturing process |
| CN110983191A (en) * | 2019-12-31 | 2020-04-10 | 九牧厨卫股份有限公司 | High-corrosion-resistance stainless steel plate, stainless steel trough and preparation method thereof |
| CN111057967A (en) * | 2019-12-31 | 2020-04-24 | 九牧厨卫股份有限公司 | High-corrosion-resistance and scratch-resistance stainless steel plate, stainless steel trough and preparation method thereof |
| WO2020095559A1 (en) * | 2018-11-05 | 2020-05-14 | Ｊｆｅスチール株式会社 | Seamless martensite stainless steel tube for oil well pipes, and method for manufacturing same |
| CN111203685A (en) * | 2020-02-04 | 2020-05-29 | 中国石油天然气集团有限公司 | Hot rolling repair method for corrosion eccentric wear waste oil pipe |
| CN111215474A (en) * | 2019-11-29 | 2020-06-02 | 江阴华润制钢有限公司 | Manufacturing method of martensite stainless steel continuous casting billet extrusion seamless tube |
| CN111761303A (en) * | 2020-06-17 | 2020-10-13 | 盐城中德精锻股份有限公司 | Cold forging processing technology of stepped hollow shaft |
| CN113584407A (en) * | 2020-04-30 | 2021-11-02 | 宝山钢铁股份有限公司 | High-strength high-temperature corrosion resistant martensitic stainless steel and manufacturing method thereof |
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| CN104411852A (en) * | 2012-06-21 | 2015-03-11 | 杰富意钢铁株式会社 | High-strength stainless steel seamless pipe having excellent corrosion resistance for oil well, and method for manufacturing same |
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| WO2017050229A1 (en) * | 2015-09-24 | 2017-03-30 | 宝山钢铁股份有限公司 | Process for on-line quenching of seamless steel tube using waste heat and manufacturing method |
| US11293072B2 (en) | 2015-09-24 | 2022-04-05 | Baoshan Iron & Steel Co., Ltd. | Process for on-line quenching of seamless steel tube using residual heat and manufacturing method |
| CN108277438A (en) * | 2018-03-29 | 2018-07-13 | 太原钢铁(集团)有限公司 | Mo ultralow-carbon martensitic stainless steel seamless pipe and its manufacturing method |
| JP6743992B1 (en) * | 2018-11-05 | 2020-08-19 | Ｊｆｅスチール株式会社 | Martensitic stainless seamless steel pipe for oil country tubular goods and method for producing the same |
| WO2020095559A1 (en) * | 2018-11-05 | 2020-05-14 | Ｊｆｅスチール株式会社 | Seamless martensite stainless steel tube for oil well pipes, and method for manufacturing same |
| CN109513766A (en) * | 2018-11-15 | 2019-03-26 | 南通金尼新材料科技有限公司 | A kind of manufacturing method of high concentricity martensitic stainless steel seamless pipe material |
| CN109811252A (en) * | 2018-12-21 | 2019-05-28 | 江苏星火特钢有限公司 | A kind of high strength martensitic stainless steel and its manufacturing process |
| CN111215474A (en) * | 2019-11-29 | 2020-06-02 | 江阴华润制钢有限公司 | Manufacturing method of martensite stainless steel continuous casting billet extrusion seamless tube |
| CN110983191A (en) * | 2019-12-31 | 2020-04-10 | 九牧厨卫股份有限公司 | High-corrosion-resistance stainless steel plate, stainless steel trough and preparation method thereof |
| CN111057967A (en) * | 2019-12-31 | 2020-04-24 | 九牧厨卫股份有限公司 | High-corrosion-resistance and scratch-resistance stainless steel plate, stainless steel trough and preparation method thereof |
| CN111203685A (en) * | 2020-02-04 | 2020-05-29 | 中国石油天然气集团有限公司 | Hot rolling repair method for corrosion eccentric wear waste oil pipe |
| CN113584407A (en) * | 2020-04-30 | 2021-11-02 | 宝山钢铁股份有限公司 | High-strength high-temperature corrosion resistant martensitic stainless steel and manufacturing method thereof |
| CN111761303A (en) * | 2020-06-17 | 2020-10-13 | 盐城中德精锻股份有限公司 | Cold forging processing technology of stepped hollow shaft |
| WO2024125407A1 (en) * | 2022-12-13 | 2024-06-20 | 钢铁研究总院有限公司 | Highly corrosion-resistant oil well steel pipe and preparation method therefor |
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Application publication date: 20151111 |