阅读说明：本技术 耐高温3Cr-1Mo-0.25V合金钢板的制备方法 (The preparation method of high temperature resistant 3Cr-1Mo-0.25V alloy-steel plate ) 是由 邓建军 赵国昌 李样兵 袁锦程 吴艳阳 龙杰 柳付芳 牛红星 尹卫江 侯敬超 王 于 2019-08-20 设计创作，主要内容包括：本发明公开了耐高温3Cr-1Mo-0.25V合金钢板的制备方法,包括冶炼、连铸、电渣重熔、加热、轧制、热处理工序。本发明耐高温3Cr-1Mo-0.25V合金钢板在经过模焊温度705-710℃,模焊时间34-36h处理后检验板厚1/2处性能：屈服强度≥415MPa、抗拉强度580-760MPa,延伸率≥20%；-80℃AKV冲击功单值>100J；冷弯d=2a,180°,外观无裂纹,其中d为弯芯直径,a为试样厚度；500℃高温拉伸屈服强度Rp0.2≥315MPa；钢板强韧性匹配良好,能够满足中高温高压环境使用的需求；制备方法可操作性强,在满足钢板性能要求的基础上成本更低,市场潜力和竞争力很大。(The invention discloses the preparation methods of high temperature resistant 3Cr-1Mo-0.25V alloy-steel plate, including smelting, continuous casting, electroslag remelting, heating, rolling, heat treatment procedure.High temperature resistant 3Cr-1Mo-0.25V alloy-steel plate of the present invention is passing through 705-710 DEG C of die welding temperature, examines performance at plate thickness 1/2: yield strength >=415MPa, tensile strength 580-760MPa, elongation percentage >=20% after die welding time 34-36h processing；- 80 DEG C of AKV ballistic work monodrome > 100J；Clod wash d=2a, 180 °, appearance flawless, wherein d is curved core diameter, and a is sample thickness；500 DEG C of drawing by high temperature yield strength Rp0.2 >=315MPa；The matching of steel plate obdurability is good, can satisfy the demand that high temperature hyperbaric environment uses；Preparation method strong operability, cost is lower on the basis of meeting plate property requirement, and market potential and competitiveness are very big.)

1. the preparation method of high temperature resistant 3Cr-1Mo-0.25V alloy-steel plate, which is characterized in that the method includes smelting, continuous casting, Electroslag remelting, heating, rolling, heat treatment procedure, specific process step are as described below:

(1) smelt, continuous casting working procedure: molten steel carries out continuous casting after electric furnace just refines, LF furnace refines, VD is vacuum-treated, and obtains continuous casting billet； Electric furnace steel tapping P≤0.005%, 1650-1700 DEG C of tapping temperature, slag free tapping；

(2) electroslag remelting process: electrode is made using continuous casting billet, mounts to 980mm crystallizer and carries out electroslag remelting, electroslag remelting Infusing slag temperature is 1600-1660 DEG C, and average molten speed is 900-1200kg/h, and submerged arc depth is 5-80mm, band after ESR ingot demoulding Temperature cleaning, it is 180-250 DEG C that ESR ingot band temperature, which clears up temperature,；

(3) heating process: qualified ESR ingot is cleared up in single-unit furnace and is heated to 1260-1380 DEG C, is rolled after keeping the temperature 38-50h System；

(4) rolling process: 1100-1300 DEG C of start rolling temperature, percentage pass reduction≤13%；

(5) heat treatment procedure: 920-1000 DEG C of hardening heat, total heating time 1.8-2.8min/mm, quenching process total Water >= 13000m³/ h quenches water temperature≤25 DEG C, and cool time 60-90min, steel plate water cooling is to 20-25 DEG C；Tempering temperature 670- It is 750 DEG C, total heating time 3.0-4.0min/mm, air-cooled after tempering.

2. the preparation method of high temperature resistant 3Cr-1Mo-0.25V alloy-steel plate according to claim 1, which is characterized in that institute State high temperature resistant 3Cr-1Mo-0.25V alloy-steel plate with a thickness of 151-250mm.

3. the preparation method of high temperature resistant 3Cr-1Mo-0.25V alloy-steel plate according to claim 1, which is characterized in that institute State alloying element in high temperature resistant 3Cr-1Mo-0.25V alloy-steel plate: Cr:2.75-3.25%, Mo:0.90-1.10%, V:0.20- 0.30%。

4. the preparation method of high temperature resistant 3Cr-1Mo-0.25V alloy-steel plate according to claim 1 to 3, special Sign is that field trash A class is slightly+thin system≤1.0 grades, B class at the high temperature resistant 3Cr-1Mo-0.25V alloy-steel plate plate thickness 1/2 Thick system+thin≤1.5 grades of system, C class are slightly+thin≤1.5 grades of system, D class are slightly+thin system≤1.0 grades, class≤1.5 grade Ds；Grain size 6.5-8.0 grade.

5. the preparation method of high temperature resistant 3Cr-1Mo-0.25V alloy-steel plate according to claim 1 to 3, special Sign is that the high temperature resistant 3Cr-1Mo-0.25V alloy-steel plate is passing through 705-710 DEG C of die welding temperature, die welding time 34-36h Performance at plate thickness 1/2: yield strength >=415MPa, tensile strength 580-760MPa, elongation percentage >=20% is examined after processing；-80℃ AKV ballistic work monodrome > 100J；Clod wash d=2a, 180 °, appearance flawless, wherein d is curved core diameter, and a is sample thickness；500℃ Drawing by high temperature yield strength Rp0.2 >=315MPa.

Technical field

The invention belongs to metallurgical technology fields, and in particular to the preparation method of high temperature resistant 3Cr-1Mo-0.25V alloy-steel plate.

Background technique

It currently, is the needs for meeting petrochemical industry, coal chemical industry fast development, boiler and pressure vessel equipment is gradually to large size Change and complicate direction and develop, at the same time, country is but growing on and on to the attention degree of its safety.For this purpose, most manufactures Factory transfers to develop to tankage lightweight direction, expedited the emergence of out naturally as the novel hydrogenations reactor such as 2.25Cr-1Mo-0.3V, Reforming reactor pressure vessel new steel plate.However, as designing institute and manufactory are directed to the designing technique difficulty of such steel It is increasing, for example require 34h or longer die welding time, 705 DEG C or higher die welding temperature etc..If still using above-mentioned normal Steel plate is advised, the Strength surplus amount of maximum norm postwelding is little, and part index number cannot even be met the requirements.

In conclusion there is an urgent need to develop steel heavy plate for pressure vessels more of new generation is gone out, to meet the technical need increasingly promoted, It make a good technical reserve.

Summary of the invention

The technical problem to be solved in the present invention is to provide the preparation methods of high temperature resistant 3Cr-1Mo-0.25V alloy-steel plate.It should The matching of steel plate obdurability made from invention preparation method is good, can satisfy the demand that high temperature hyperbaric environment uses.

In order to solve the above technical problems, the technical solution adopted by the present invention is that: high temperature resistant 3Cr-1Mo-0.25V alloy-steel plate Preparation method, the method includes smelting, continuous casting, electroslag remelting, heating, rolling, heat treatment procedures, and specific process step is such as It is lower described:

(1) smelt, continuous casting working procedure: molten steel carries out continuous casting after electric furnace just refines, LF furnace refines, VD is vacuum-treated, and obtains continuous casting billet； Electric furnace steel tapping P≤0.005%, 1650-1700 DEG C of tapping temperature, slag free tapping；

(2) electroslag remelting process: electrode is made using continuous casting billet, mounts to 980mm crystallizer and carries out electroslag remelting, electroslag remelting Infusing slag temperature is 1600-1660 DEG C, and average molten speed is 900-1200kg/h, and submerged arc depth is 5-80mm, band after ESR ingot demoulding Temperature cleaning, it is 180-250 DEG C that ESR ingot band temperature, which clears up temperature,；

(3) heating process: qualified ESR ingot is cleared up in single-unit furnace and is heated to 1260-1380 DEG C, is rolled after keeping the temperature 38-50h System；

(4) rolling process: 1100-1300 DEG C of start rolling temperature, percentage pass reduction≤13%；

(5) heat treatment procedure: 920-1000 DEG C of hardening heat, total heating time 1.8-2.8min/mm, quenching process total Water >= 13000m³/ h quenches water temperature≤25 DEG C, and cool time 60-90min, steel plate water cooling is to 20-25 DEG C；Tempering temperature 670- It is 750 DEG C, total heating time 3.0-4.0min/mm, air-cooled after tempering.

High temperature resistant 3Cr-1Mo-0.25V alloy-steel plate of the present invention with a thickness of 151-250mm.

Alloying element in high temperature resistant 3Cr-1Mo-0.25V alloy-steel plate of the present invention: Cr:2.75-3.25%, Mo:0.90- 1.10%, V:0.20-0.30%.

Field trash A class is slightly+is carefully≤1.0 at high temperature resistant 3Cr-1Mo-0.25V alloy-steel plate plate thickness 1/2 of the present invention Grade, B class are slightly that+thin≤1.5 grades of system, C class are slightly+thin≤1.5 grades of system, D class is slightly+thin system≤1.0 grades, class≤1.5 grade Ds；It is brilliant 6.5-8.0 grades of granularity.

High temperature resistant 3Cr-1Mo-0.25V alloy-steel plate of the present invention is passing through 705-710 DEG C of die welding temperature, die welding time Performance at inspection plate thickness 1/2 after 34-36h processing: yield strength >=415MPa, tensile strength 580-760MPa, elongation percentage >= 20%；- 80 DEG C of AKV ballistic work monodrome > 100J；Clod wash d=2a, 180 °, appearance flawless, wherein d is curved core diameter, and a is sample Thickness；500 DEG C of drawing by high temperature yield strength Rp0.2 >=315MPa.

Smelting procedure of the present invention, electric furnace smelting, the pig iron and the total additional amount of molten iron are not less than the half of tap, as far as possible Reduce the additional amount of social steel scrap；Reinforce molten oxygen phase low temperature during electric furnace smelting and take off P operation, using big quantity of slag duty stream slag, benefit P is taken off in depth；Slag, diligent stream slag are frequently changed in smelting process.

The die welding condition of high temperature resistant 3Cr-1Mo-0.25V alloy-steel plate of the present invention: 705-710 DEG C of die welding temperature, when die welding Between 34-36h, take on 200-350 DEG C of furnace temperature, 50-55 DEG C of temperature rate/h.

Mentality of designing of the present invention:

The present invention uses Cr, Mo, V complex intensifying mechanism, gives full play to each element with more preferably alloying element content and ratio Maximum effect, it is ensured that plate property is moderately good.

C can directly affect the intensity of steel, plasticity and toughness, in certain content range, increase with its content, the intensity of steel gradually rises Height, but plasticity declines, toughness decline, welding performance can also simultaneously decline, thus its content be not easy it is too high；

Si element can promote the harmful elements such as P, Sn segregation on crystal boundary, reduce the low-temperature impact toughness of steel, and content should also be controlled System is in low-level；Mn can enhance the harden ability of steel, but the plasticity of the excessively high steel of its additional amount, toughness can decline, additional amount It should not be too high；

The carbide that Cr, Mo, V element are formed can effectively expande austenite degree of supercooling, enhances the harden ability of steel, improves the strong of steel Degree, toughness and heat resistance, while may also function as precipitation strength and solid solution strengthening effect.

The beneficial effects of adopting the technical scheme are that the 1, present invention uses electric furnace smelting, by preferred former Expect, harmful element and residual element content are low in steel, and Molten Steel Cleanliness is high；Steel plate is become a useful person using ESR ingot hot rolling, ESR ingot group It knits densification and compression ratio is big, compared to other modes of becoming a useful person, steel plate through thickness performance is more guaranteed；Steel plate heating process Heating cost is reduced on the basis of ensuring ESR ingot uniform well-burnt.2, high temperature resistant 3Cr-1Mo-0.25V alloy-steel plate of the present invention Passing through 705-710 DEG C of die welding temperature, performance at inspection plate thickness 1/2 after die welding time 34-36h processing: yield strength >= 415MPa, tensile strength 580-760MPa, elongation percentage >=20%；- 80 DEG C of AKV ballistic work monodrome > 100J；Clod wash d=2a, 180 °, Appearance flawless, wherein d is curved core diameter, and a is sample thickness；500 DEG C of drawing by high temperature yield strength Rp0.2 >=315MPa；Steel The matching of plate obdurability is good, can satisfy the demand that high temperature hyperbaric environment uses.3, high temperature resistant 3Cr-1Mo-0.25V of the present invention Field trash A class is slightly at alloy-steel plate plate thickness 1/2+thin≤1.0 grades of system, B class are slightly+thin≤1.5 grades of system, C class be slightly+thin system≤ 1.5 grades, D class be slightly+thin system≤1.0 grades, class≤1.5 grade Ds；6.5-8.0 grades of grain size.4, preparation method of the present invention can operate Property is strong, and cost is lower on the basis of meeting plate property requirement, and market potential and competitiveness are very big.

Specific embodiment

Present invention will be explained in further detail combined with specific embodiments below.