CN105734242A - Large-diameter thick-wall chromium-molybdenum steel thermal-formed end seal thermal treatment process - Google Patents
Large-diameter thick-wall chromium-molybdenum steel thermal-formed end seal thermal treatment process Download PDFInfo
- Publication number
- CN105734242A CN105734242A CN201610278113.7A CN201610278113A CN105734242A CN 105734242 A CN105734242 A CN 105734242A CN 201610278113 A CN201610278113 A CN 201610278113A CN 105734242 A CN105734242 A CN 105734242A
- Authority
- CN
- China
- Prior art keywords
- molybdenum steel
- chrome
- thermal
- end seal
- chromium
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- 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.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
Abstract
The invention discloses a large-diameter thick-wall chromium-molybdenum steel thermal-formed end seal thermal treatment process which comprises the following steps of: performing normalization treatment on a thermal-formed end seal at 940 DEG C, keeping the temperature for 2 hours, discharging from a furnace, putting into water to rapidly cool, performing annealing treatment at 710+/-20 DEG C, and performing heat preservation for 2min/mm; and performing stress elimination thermal treatment at 670+/-20 DEG C, and performing heat preservation according to the following time rules: when the thickness delta of a chromium-molybdenum steel end seal is greater than or equal to 50mm and less than 125mm, the thermal treatment time is h; when the thickness delta of the chromium-molybdenum steel end seal is greater than or equal to 125mm, the thermal treatment time is h. By adopting the thermal treatment process disclosed by the invention, the mechanical properties of a chromium-molybdenum steel thermal formed end seal can be recovered, and the thermal resistance and hydrogen corrosion resistance of chromium-molybdenum steel equipment can be ensured to the maximum extent.
Description
Technical field
The present invention relates to major-diameter thick-wall chrome-molybdenum steel thermoforming seal head heat treatment technology, belong to chemical equipment and manufacture field.
Background technology
Chrome-molybdenum steel sheet material supply of material condition of heat treatment is generally normalizing or normalizing+tempering, and major-diameter thick-wall (δ >=50) chrome-molybdenum steel end socket generally adopts thermoforming, and heating-up temperature is higher than upper transition temperature point Ac3, and high temperature causes Material degradation；On the other hand, end socket splicing welding joint causes the change of weld dimensions tissue and performance, reduces the mechanical property of material, affects the safe application performance of equipment.
Summary of the invention
The present invention is to provide for a kind of major-diameter thick-wall chrome-molybdenum steel thermoforming seal head heat treatment technology, solves the technical problem of the mechanical properties decrease caused in major-diameter thick-wall chrome-molybdenum steel thermoforming end socket manufacture process due to thermal cycle.
The present invention adopts the following technical scheme that realization: a kind of major-diameter thick-wall chrome-molybdenum steel thermoforming seal head heat treatment technology, realizes according to the following steps:
One, normalizing+quickly cooling process: after chrome-molybdenum steel end socket thermoforming, carrying out normalized treatment, furnace temperature is raised to 940 DEG C, is incubated 2h, and coming out of the stove to put in water quickly cools down；
Two, temper: the chrome-molybdenum steel end socket after normalized treatment carries out temper, and temperature 710 ± 20 DEG C, temperature retention time is by 2min/mm；
Three, hidden lino removal: after chrome-molybdenum steel end socket and equipment barrel assembly welding complete, carry out overall hidden lino removal, heat treatment temperature 670 ± 20 DEG C, temperature retention time according to the following rules: as chrome-molybdenum steel end socket wall thickness 50mm≤δ < 125mm, heat treatment time ish；As chrome-molybdenum steel end socket wall thickness δ >=125mm, heat treatment time ish。
What table 1 represented is the temperature retention time rule in step 3.In step 2, temperature retention time is by 2min/mm, refers to the temperature retention time THICKNESS CALCULATION according to chrome-molybdenum steel end socket, and if thickness is 60mm, temperature retention time is 2min/mm60mm=120min。
Technology for Heating Processing of the present invention, it is ensured that chrome-molybdenum steel thermoforming end socket recovers mechanical property, ensures the heat-resisting and resistant to hydrogen corrosive nature of chrome-molybdenum steel equipment to greatest extent.
Accompanying drawing explanation
Fig. 1 is the flow chart of the present invention a kind of major-diameter thick-wall chrome-molybdenum steel thermoforming seal head heat treatment technology.
Detailed description of the invention
Embodiment
The present embodiment material 14Cr1MoR, thickness δ=80mm test specimen simulation end socket welding, after thermoforming, carries out heat treatment to imitation specimen, concretely comprises the following steps:
One, normalizing+quickly cooling process.By the test specimen shove charge normalized treatment after simulation thermoforming, it is incubated 2h, comes out of the stove and put in water, quickly cool down；
Two, temper.Test specimen after normalized treatment is carried out temper, temperature 710 ± 20 DEG C, is incubated 160min；
Three, hidden lino removal.Test specimen carries out overall hidden lino removal, and charging temperature≤400 DEG C, when furnace temperature is raised to 400 DEG C, programming rate is 55 ~ 70 DEG C/h, and furnace temperature is raised to 670 ± 20 DEG C, is incubated 3.2h, cooling rate is 55 ~ 86 DEG C/h, during furnace temperature≤400 DEG C, cools down after coming out of the stove in still air.
Steel plate mother metal and welding point, through simulation end socket welding, hot shaping & heat treatment, are carried out Mechanics Performance Testing by the steel plate of embodiment, and test result is in Table 2.
Claims (1)
1. a major-diameter thick-wall chrome-molybdenum steel thermoforming seal head heat treatment technology, it is characterised in that realize according to the following steps:
One, normalizing+quickly cooling process: after chrome-molybdenum steel end socket thermoforming, carrying out normalized treatment, furnace temperature is raised to 940 DEG C, is incubated 2h, and coming out of the stove to put in water quickly cools down；
Two, temper: the chrome-molybdenum steel end socket after normalized treatment carries out temper, and temperature 710 ± 20 DEG C, temperature retention time is by 2min/mm；
Three, hidden lino removal: after chrome-molybdenum steel end socket and equipment barrel assembly welding complete, carry out overall hidden lino removal, heat treatment temperature 670 ± 20 DEG C, temperature retention time according to the following rules: as chrome-molybdenum steel end socket wall thickness 50mm≤δ < 125mm, heat treatment time ish；As chrome-molybdenum steel end socket wall thickness δ >=125mm, heat treatment time ish。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610278113.7A CN105734242A (en) | 2016-04-29 | 2016-04-29 | Large-diameter thick-wall chromium-molybdenum steel thermal-formed end seal thermal treatment process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610278113.7A CN105734242A (en) | 2016-04-29 | 2016-04-29 | Large-diameter thick-wall chromium-molybdenum steel thermal-formed end seal thermal treatment process |
Publications (1)
| Publication Number | Publication Date |
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| CN105734242A true CN105734242A (en) | 2016-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610278113.7A Pending CN105734242A (en) | 2016-04-29 | 2016-04-29 | Large-diameter thick-wall chromium-molybdenum steel thermal-formed end seal thermal treatment process |
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| CN (1) | CN105734242A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106734715A (en) * | 2017-01-16 | 2017-05-31 | 兰州兰石重型装备股份有限公司 | 904L+Q345R pressure container of composite board end socket thermoforming process |
| CN107739802A (en) * | 2017-09-18 | 2018-02-27 | 舞阳钢铁有限责任公司 | A kind of end socket thermoforming process of 15CrMoR steel plates |
| CN110541065A (en) * | 2019-08-19 | 2019-12-06 | 舞阳钢铁有限责任公司 | Postweld heat treatment process of chromium-molybdenum submerged arc welded pipe |
| CN111663027A (en) * | 2020-06-10 | 2020-09-15 | 舞阳钢铁有限责任公司 | Postweld heat treatment process of chromium-molybdenum steel plate for gasification furnace |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106734715A (en) * | 2017-01-16 | 2017-05-31 | 兰州兰石重型装备股份有限公司 | 904L+Q345R pressure container of composite board end socket thermoforming process |
| CN107739802A (en) * | 2017-09-18 | 2018-02-27 | 舞阳钢铁有限责任公司 | A kind of end socket thermoforming process of 15CrMoR steel plates |
| CN110541065A (en) * | 2019-08-19 | 2019-12-06 | 舞阳钢铁有限责任公司 | Postweld heat treatment process of chromium-molybdenum submerged arc welded pipe |
| CN111663027A (en) * | 2020-06-10 | 2020-09-15 | 舞阳钢铁有限责任公司 | Postweld heat treatment process of chromium-molybdenum steel plate for gasification furnace |
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Application publication date: 20160706 |