CN105296845A - Manufacturing method for ultra-low-temperature corrosion-resistant high-strength forge piece blank - Google Patents
Manufacturing method for ultra-low-temperature corrosion-resistant high-strength forge piece blank Download PDFInfo
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- CN105296845A CN105296845A CN201510685155.8A CN201510685155A CN105296845A CN 105296845 A CN105296845 A CN 105296845A CN 201510685155 A CN201510685155 A CN 201510685155A CN 105296845 A CN105296845 A CN 105296845A
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Abstract
The invention discloses a manufacturing method for an ultra-low-temperature corrosion-resistant high-strength forge piece blank. The manufacturing method includes the steps that a, blank steel is taken and used as raw materials, enters a pre-heated forging furnace and is heated, the preserved forging heating temperature is 550+/-20 DEG C, and the temperature preservation time is 1 h; then the temperature is increased to 900 DEG C, and the temperature preservation time is more than 1.5 h; the temperature is increased to 1160 DEG C at the speed of 100 DEG C/h, and the temperature preservation time is 0.5h/25.4 mm according to the wall thickness of products; forging is started, the initial forging temperature is 1140-1160 DEG C, and the final forging temperature is not less than 900 DEG C; upsetting and drawing-out are carried out repeatedly three times in the cross direction, the final forging ratio is larger than 1.2: 1, and a forge piece is cooled to the room temperature from the final forging temperature in the furnace; b, the oxide skin is removed; c, subcritical quenching is carried out, specifically, the temperature is increased to 580+/-10 DEG C and kept for 1.5 h, then the temperature is increased to 800+/-10 DEG C and kept for 8.5 h, and water quenching is carried out; and d, tempering and water quenching are carried out, specifically, the temperature is increased to 200+/-10 DEG C and kept for 1h, the temperature is increased to 510+/-10 DEG C and kept for 1.5 h, then the temperature is increased to 590+/-8 DEG C and kept for 9 h, and finally quenching is carried out.
Description
Technical field
The present invention relates to the manufacture method of the corrosion resistant high strength forging blank of a kind of very low temperature.
Background technology
Be to reduce the hydrocarbon resources that cost of winning obtains high yield at deep-sea, its winning apparatus needs to possess higher overall characteristic, the particularly selection of key components and parts, as seabed high-pressure valve, preventer, driver's valve etc., once break down or problem, all will cause extensive stopping production or huge environmental disaster, to such an extent as to cause the problems such as huge loss and reparation, therefore, the key part of these key equipments all needs over-all properties far away higher than current existing common standard material.
Although stainless steel can meet its low-temperature flexibility requirement in high-tension apparatus, its intensity cannot meet the strength of materials of high-tension apparatus design, otherwise dual phase steel or super duplex steel can meet its requirement of strength, but low-temperature flexibility far from can meet.
Summary of the invention
Technical problem to be solved by this invention is: the manufacture method providing the corrosion resistant high strength forging blank of a kind of very low temperature.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: the manufacture method of the corrosion resistant high strength forging blank of a kind of very low temperature, the steps include:
A. getting components by weight percent is: C:0.03-0.10%, Si:0.05-0.20%, Mn:0.10-0.25%, P :≤0.015%, S :≤0.010%, Cr :≤0.50%, Ni:8.5-9.5%, Mo :≤0.25%, Cu :≤0.30%, Nb:0.03-0.08%, V:0.03-0.05%, Al:0.02-0.06%, all the other are Fe and other residual element, every other residual element add V, summation≤1.0% of Al, Nb, and wherein H :≤1.6ppm, O :≤20.0ppm, the base steel of N :≤120.0ppm is the interior heating of forging furnace after raw material enters preheating, heating rate is less than 150 DEG C/h, Forge Heating holding temperature is 550 ± 20 DEG C, soaking time 1h, again with 120 DEG C/h of ramp to 900 DEG C, be incubated more than 1.5 hours, continue with 100 DEG C/h of ramp to 1160 DEG C, soaking time: be 0.5 hour/25.4 millimeters according to product wall thickness, then forging is started, initial forging temperature controls at 1140-1160 DEG C, final forging temperature is not less than 900 DEG C, use three the jumping-up pullings repeatedly of cross direction, last forging ratio is greater than 1.2:1, forging in airtight stove by final forging temperature cool to room temperature,
B. mechanical workout removes its oxide skin;
C. intercritical hardening: heat to 580 ± 10 DEG C, insulation 1.5h, is warming up to 800 ± 10 DEG C, insulation 8.5h, shrend;
D. tempering shrend: heat to 200 ± 10 DEG C, insulation 1h, is warming up to 510 ± 10 DEG C, and insulation 1.5h, is warming up to 590 ± 8 DEG C, insulation 9h, quenching.
As the preferred scheme of one, when intercritical hardening and tempering shrend, temperature rise rate is less than 150 DEG C/h.
As the preferred scheme of one, when starting and terminate quenching, water temperature needs to be limited in less than 30 DEG C.
As the preferred scheme of one, forging times is within 4 fire are secondary.
As the preferred scheme of one, burner hearth preheating temperature is greater than 500 DEG C.
The invention has the beneficial effects as follows: the very low temperature anti-corrosion and high strength forging material that present method manufactures, can be applied to the oil production equipment such as polar region, deep-sea, or in the production unit of the extreme low temperature environment of liquify natural gas and very low temperature media environment.This material still possesses good low-temperature flexibility (ballistic work is greater than 100 joules) under subzero 196 DEG C of environment, possess that high-strength (tensile strength can reach 101 simultaneously, 500psi, yield strength can reach 81,200psi), the feature (H 2 S stress corrosion of simulated production environmental resistance 720 hours PH<3.0) such as corrosion resistant, significantly improve the work-ing life of key part and the resistance to corrosion of extreme environment, reduce replacement frequency, increase the service life, significantly reduce the maintaining cost of equipment.
Embodiment
Specific embodiment of the invention scheme is described below in detail.
A manufacture method for the corrosion resistant high strength forging blank of very low temperature, the steps include:
A. getting components by weight percent is: C:0.03-0.10%, Si:0.05-0.20%, Mn:0.10-0.25%, P :≤0.015%, S :≤0.010%, Cr :≤0.50%, Ni:8.5-9.5%, Mo :≤0.25%, Cu :≤0.30%, Nb:0.03-0.08%, V:0.03-0.05%, Al:0.02-0.06%, all the other are Fe and other residual element, every other residual element add V, Al, summation≤1.0% of Nb, and wherein H :≤1.6ppm, O :≤20.0ppm, N :≤120.0ppm base steel is that raw material enters heating in forging furnace that preheating temperature is greater than 500 DEG C, heating rate is less than 150 DEG C/h, Forge Heating holding temperature is 550 DEG C, soaking time 1h, again with 120 DEG C/h of ramp to 900 DEG C, be incubated more than 1.5 hours, continue with 100 DEG C/h of ramp to 1160 DEG C, soaking time: be 0.5 hour/25.4 millimeters according to product wall thickness, time enough is kept to make the thorough homogeneous heating in whole cross section of blank, avoid the excessive internal temperature that causes of internal-external temperature difference lower than malleable temperature, thus cause the generation of internal cleavage and minimal stress crackle.
Then start forging, initial forging temperature controls at 1140-1160 DEG C, and final forging temperature is not less than 900 DEG C, and use three the jumping-up pullings repeatedly of cross direction, last forging ratio must be greater than 1.2:1, and forging times is within 4 fire are secondary.Forging in airtight stove by final forging temperature cool to room temperature.Guarantee to forge rear compact structure, forging fiber uniformity; Broken Cast Austenite coarse-grain dendrite, makes inclusion distribution disperse, eliminates banded structure, obtains compact grained and evenly forges tissue.
B. mechanical workout removes its oxide skin, avoids abundant oxide skin in heating and quenching process, affect the homogeneity of heating materials and cooling.
C. intercritical hardening: heat to 580 DEG C, insulation 1.5h, is warming up to 800 DEG C, insulation 8.5h, shrend; Temperature rise rate is less than 150 DEG C/h.
D. tempering shrend: heat to 200 DEG C, insulation 1h, is warming up to 510 DEG C, and insulation 1.5h, is warming up to 590 DEG C, insulation 9h, quenching.Temperature rise rate is less than 150 DEG C/h.When starting and terminate quenching, water temperature needs to be limited in less than 30 DEG C.
Its heat treatment mode is the technique of intercritical hardening+tempering shrend, can its crystal grain of refinement, improves low-temperature flexibility, and has the effect suppressing temper brittleness.Be greater than the solubleness in austenite due to the solubleness of impurity element in ferrite, decrease the probability of austenite grain boundary enrichment impurity, therefore improve intensity and the toughness of material simultaneously.
In liquid natural feed channel and storing device, the accumulating temperature of natural gas liquids is subzero 162 degree, and it is the austenitic stainless steel of representative that routine is selected with F316L, but the tensile strength of F316L is minimum 70,325psi, 0.2% yield strength requires as minimum 24,650psi; And the tensile strength of this material can arrive 101, more than 500psi, yield strength then can more than 81,200psi.If the design of equipment selects stainless steel as material, its high pressure resistant requirement be met, then have to roll up its wall thickness, cause the weight and volume of equipment huge, its material cost and transport difficulty must be increased, run counter to the development principle of environmental protection and saving.And select material of the present invention, its production cost is well below the manufacturing cost of austenitic stainless steel.
In anticorrosion valve field, general application adopts common structural alloy steel AISI4130 material+precious metal nickel and nickel-base alloy Inconel625 built-up welding to carry out the production of valve parts.And adopt forging material of the present invention, and can directly utilize, anticorrosion without the need to built-up welding, greatly save production cost, reduced process procedure, shortened the production cycle, reduce the hidden danger of quality in multiple operation.
The above embodiments are the principle of illustrative the invention and effect thereof only, and the embodiment that part is used, but not for limiting the present invention; It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise of the invention, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Claims (5)
1. a manufacture method for the corrosion resistant high strength forging blank of very low temperature, the steps include:
A. getting components by weight percent is: C:0.03-0.10%, Si:0.05-0.20%, Mn:0.10-0.25%, P :≤0.015%, S :≤0.010%, Cr :≤0.50%, Ni:8.5-9.5%, Mo :≤0.25%, Cu :≤0.30%, Nb:0.03-0.08%, V:0.03-0.05%, Al:0.02-0.06%, all the other are Fe and other residual element, every other residual element add V, summation≤1.0% of Al, Nb, and wherein H :≤1.6ppm, O :≤20.0ppm, the base steel of N :≤120.0ppm is the interior heating of forging furnace after raw material enters preheating, heating rate is less than 150 DEG C/h, Forge Heating holding temperature is 550 ± 20 DEG C, soaking time 1h, again with 120 DEG C/h of ramp to 900 DEG C, be incubated more than 1.5 hours, continue with 100 DEG C/h of ramp to 1160 DEG C, soaking time: be 0.5 hour/25.4 millimeters according to product wall thickness, then forging is started, initial forging temperature controls at 1140-1160 DEG C, final forging temperature is not less than 900 DEG C, use three the jumping-up pullings repeatedly of cross direction, last forging ratio is greater than 1.2:1, forging in airtight stove by final forging temperature cool to room temperature,
B. mechanical workout removes its oxide skin;
C. intercritical hardening: heat to 580 ± 10 DEG C, insulation 1.5h, is warming up to 800 ± 10 DEG C, insulation 8.5h, shrend;
D. tempering shrend: heat to 200 ± 10 DEG C, insulation 1h, is warming up to 510 ± 10 DEG C, and insulation 1.5h, is warming up to 590 ± 8 DEG C, insulation 9h, quenching.
2. the manufacture method of the corrosion resistant high strength forging blank of a kind of very low temperature as claimed in claim 1, is characterized by: when intercritical hardening and tempering shrend, temperature rise rate is less than 150 DEG C/h.
3. the manufacture method of the corrosion resistant high strength forging blank of a kind of very low temperature as claimed in claim 2, is characterized by: when starting and terminate quenching, water temperature needs to be limited in less than 30 DEG C.
4. the manufacture method of the corrosion resistant high strength forging blank of a kind of very low temperature as claimed in claim 3, is characterized by: forging times is within 4 fire are secondary.
5. the manufacture method of the corrosion resistant high strength forging blank of a kind of very low temperature as claimed in claim 4, is characterized by: burner hearth preheating temperature is greater than 500 DEG C.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106011656A (en) * | 2016-06-13 | 2016-10-12 | 苏州双金实业有限公司 | Steel usable at low temperature |
| CN106077384A (en) * | 2016-06-20 | 2016-11-09 | 安徽省瑞杰锻造有限责任公司 | A kind of anticracking grain processing process of cutter ring forging |
| CN114182078A (en) * | 2021-12-03 | 2022-03-15 | 上海电气上重铸锻有限公司 | Preparation method of high-strength austenite shaft heavy forging |
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| WO2005052205A1 (en) * | 2003-11-27 | 2005-06-09 | Sumitomo Metal Industries, Ltd. | High tensile steel excellent in toughness of welded zone and offshore structure |
| CN101705433A (en) * | 2009-09-29 | 2010-05-12 | 燕山大学 | 196 DEG C below zero ultralow-temperature quake-proof structural steel |
| CN103409699A (en) * | 2013-09-06 | 2013-11-27 | 陕西华威锻压有限公司 | Steel forging with ultra-high strength and ultra-high low-temperature impact on box body of fracturing pump valve and manufacturing method of steel forging |
| CN103978342A (en) * | 2014-04-08 | 2014-08-13 | 南阳二机石油装备(集团)有限公司 | Manufacturing method of hook body of large hook for polar region drilling machine |
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- 2015-10-21 CN CN201510685155.8A patent/CN105296845B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005052205A1 (en) * | 2003-11-27 | 2005-06-09 | Sumitomo Metal Industries, Ltd. | High tensile steel excellent in toughness of welded zone and offshore structure |
| CN101705433A (en) * | 2009-09-29 | 2010-05-12 | 燕山大学 | 196 DEG C below zero ultralow-temperature quake-proof structural steel |
| CN103409699A (en) * | 2013-09-06 | 2013-11-27 | 陕西华威锻压有限公司 | Steel forging with ultra-high strength and ultra-high low-temperature impact on box body of fracturing pump valve and manufacturing method of steel forging |
| CN103978342A (en) * | 2014-04-08 | 2014-08-13 | 南阳二机石油装备(集团)有限公司 | Manufacturing method of hook body of large hook for polar region drilling machine |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106011656A (en) * | 2016-06-13 | 2016-10-12 | 苏州双金实业有限公司 | Steel usable at low temperature |
| CN106077384A (en) * | 2016-06-20 | 2016-11-09 | 安徽省瑞杰锻造有限责任公司 | A kind of anticracking grain processing process of cutter ring forging |
| CN114182078A (en) * | 2021-12-03 | 2022-03-15 | 上海电气上重铸锻有限公司 | Preparation method of high-strength austenite shaft heavy forging |
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Effective date of registration: 20220610 Address after: 215636 Suzhou regme Hengrui energy equipment Engineering Co., Ltd., Daxin village, Daxin Town, Zhangjiagang City, Suzhou City, Jiangsu Province Patentee after: Suzhou regham Hengrui energy equipment Engineering Co.,Ltd. Address before: 215634 Suzhou regam offshore oil equipment Technology Co., Ltd., gangyang Road, Jingang town, Zhangjiagang City, Suzhou City, Jiangsu Province Patentee before: SUZHOU LYGM SUBSEA OIL EQUIPMENT TECH. CO.,LTD. |