CN104630652A - Low-alloy heat-resistant high-strength steel and steel member and preparation methods thereof - Google Patents
Low-alloy heat-resistant high-strength steel and steel member and preparation methods thereof Download PDFInfo
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- CN104630652A CN104630652A CN201510075055.3A CN201510075055A CN104630652A CN 104630652 A CN104630652 A CN 104630652A CN 201510075055 A CN201510075055 A CN 201510075055A CN 104630652 A CN104630652 A CN 104630652A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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Abstract
The invention relates to low-alloy heat-resistant high-strength steel and a steel member and preparation methods thereof. The low-alloy heat-resistant high-strength steel comprises the following components in percentage by weight: 0.04-0.06% of C, 0.06-0.2% of Si, 0.06-0.35% of Mn, 1.3-1.5% of Cr, 0.35-0.45% of Pd, less than or equal to 0.009% of P, less than or equal to 0.006 of S, 0.2-0.4% of Ni, 0.01-0.08% of Cu, 0.3-0.4% of V, 0.1-0.2% of Nb, 0.2-0.5% of W, 0.005-0.02% of Ti and the balance of Fe and unavoidable impurities. The low-alloy heat-resistant high-strength steel member prepared from the low-alloy heat-resistant high-strength steel has the advantages of higher room temperature tensile strength, yield point and surface hardness.
Description
Technical field
The present invention relates to a kind of ferrous materials, especially a kind of low-alloy heat-resistant high-strength steel, steel beam column and preparation method thereof.
Background technology
(temperature of more than 0.3 ~ 0.5 times of material melting point is often referred to) under hot conditions, the steel with oxidation-resistance and sufficiently high temperature intensity and good resistance toheat is called high temperature steel, and the representational class of most is low-alloy heat-resistant high-strength steel in high temperature steel, namely the 15CrMo of such as China is a kind of typical low-alloy heat-resistant high-strength steel, 15CrMo is because of its good resistance toheat, mechanical property, corrosion resistance nature and be widely used in boiler, petrochemical complex, coal transforms, steam turbine wheel cylinder body, thermoelectricity, the working conditionss such as nuclear power are harsh, the pipeline of the main equipment of corrosive medium complexity, container, component etc.
General 15CrMo chemical composition (massfraction) (%) is: C 0.12 ~ 0.18, Mn 0.40 ~ 0.70, Si 0.17 ~ 0.37, Cr 0.80 ~ 1.10, Mo 0.40 ~ 0.55, Ni≤0.30, S≤0.035, P≤0.035.The mechanical property of 15CRMO: tension intensity is 440 ~ 640MPA, and yield-point is about 235MPa, elongation about 21%.
But along with the develop rapidly of modern industry, 15CrMo heat-resistance high-strength steel has more and more been difficult to meet industrial equipments requirement higher in obdurability, creep properties, weldability etc., and the processing parameter in optimized alloy composition, production engineering such as adjustment smelting, rolling etc. becomes people day by day for the focus improved 15CrMo steel and pay close attention to.Meanwhile, due to the wear resistance and resistance to fatigue etc. of the excellence of needs will be obtained, also need to carry out it thermal treatments such as carburizing and quenching, and this often makes product produce certain deformation and affect the dimensional precision of product.
Disclose a kind of preparation of low-alloy heat-resistant high-strength steel component in CN102433513A, by weight percentage, comprise following component: C 0.09 ~ 0.11, Si 0.06 ~ 0.2, Mn 0.06 ~ 0.35, Cr 1.3 ~ 1.5, Mo 0.35 ~ 0.45, P≤0.009, S≤0.006, Ni 0.2 ~ 0.4, Cu 0.01 ~ 0.08, V 0.3 ~ 0.4, Nb 0.1 ~ 0.2, W 0.2 ~ 0.5, Ti 0.005 ~ 0.02, surplus is Fe and inevitable impurity.The room temperature tensile intensity of this component is 610MPa, at 600 DEG C, under 200MPa stress test, its useful life is about the twice of 15CrMo, and the surface hardness after thermal treatment is about 750HV, and hardness is 0.5mm more than the thin hardened layer of 500HV, deflection is little, has all exceeded general 15CrMo.But the metal species comprised is many, and production cost is higher, issuable impurity component is also more complicated.
Summary of the invention
For the problems referred to above, namely object of the present invention is the composition of optimization design 15CrMo steel, and the processing parameter of adjustment smelting, rolling, thermal treatment etc., thus prepare a kind of obdurability, solidity to corrosion, welding property excellent and the little novel low-alloy heat-resistant high-strength steel of thermal treatment after strain and component product thereof.
The technical solution adopted in the present invention is as follows:
The invention provides a kind of low-alloy heat-resistant high-strength steel, by weight percentage, comprise following component: C 0.04 ~ 0.06, Si 0.06 ~ 0.2, Mn 0.06 ~ 0.35, Cr 1.3 ~ 1.5, Pd 0.35 ~ 0.45, P≤0.009, S≤0.006, Ni 0.2 ~ 0.4, Cu 0.01 ~ 0.08, V 0.3 ~ 0.4, Nb 0.1 ~ 0.2, W 0.2 ~ 0.5, Ti 0.005 ~ 0.02, surplus is Fe and inevitable impurity.
The invention provides a kind of preparation method of low-alloy heat-resistant high-strength steel component, comprise the steps:
The first, design the composition of described low-alloy heat-resistant high-strength steel, with weight, comprise: C 0.04 ~ 0.06, Si 0.06 ~ 0.2, Mn 0.06 ~ 0.35, Cr 1.3 ~ 1.5, Pd 0.35 ~ 0.45, P≤0.009, S≤0.006, Ni 0.2 ~ 0.4, Cu 0.01 ~ 0.08, V 0.3 ~ 0.4, Nb 0.1 ~ 0.2, W 0.2 ~ 0.5, Ti 0.005 ~ 0.02, surplus is Fe and inevitable impurity;
The second, smelt cast;
3rd, rolling;
4th, the processing of component;
5th, the thermal treatment of component.
Preferably, a kind of preparation method of low-alloy heat-resistant high-strength steel component, comprises the steps:
The first, design the composition of described low-alloy heat-resistant high-strength steel, with weight, comprise: C 0.04 ~ 0.06, Si 0.06 ~ 0.2, Mn 0.06 ~ 0.35, Cr 1.3 ~ 1.5, Pd 0.35 ~ 0.45, P≤0.009, S≤0.006, Ni 0.2 ~ 0.4, Cu 0.01 ~ 0.08, V 0.3 ~ 0.4, Nb 0.1 ~ 0.2, W 0.2 ~ 0.5, Ti 0.005 ~ 0.02, surplus is Fe and inevitable impurity;
The second, smelt cast, comprise electric arc furnace and just refine, ladle RH process and LF process, control molten steel and meet the rear cast of chemical composition requirement, the pressure wherein with more than 3atm during ladle refining carries out Argon at least 5 minutes, removes with the floating being conducive to impurity;
3rd, rolling, comprise equal thermal treatment, rolling and cooling, wherein all thermal treatment is soaking at least 4 ~ 6 hours in the process furnace of about 1100 ~ 1150 DEG C, the start rolling temperature of rolling is about 1000 ~ 1100 DEG C, finishing temperature is about 840 ~ 880 DEG C, and speed of cooling is about 5 ~ 10 DEG C/s, final cooling temperature is about 650 ~ 680 DEG C;
4th, the processing of component, is processed into the size and dimension of needs, prepares component by the low-alloy heat-resistant high-strength steel after rolling;
5th, the thermal treatment of component, after component is put into carburizing treatment stove with vertical state, be heated to about 870 ~ 900 DEG C, and with the speed of about 80 ~ 100 droplets/minute instillation methyl alcohol, flow simultaneously by controlling propane to maintain in stove carbon potential 0.8 ~ 0.9%, carry out diffusion carburizing treatment about 2 ~ 2.5 hours, subsequently component is pre-chilled to about 750 ~ 780 DEG C and reduces in stove carbon potential to about 0.7 ~ 0.75% and insulation about 5 ~ 10 minutes simultaneously, then component taken out from cementing furnace and be about direct quenching in the cooling oil of 120 ~ 140 DEG C in oil temperature, tempering is carried out again after quenching, tempering temperature is about 160 ~ 180 DEG C, tempering time is about 1 ~ 1.5 hour.
The invention provides a kind of low-alloy heat-resistant high-strength steel component, adopt aforesaid method to be prepared from.
Compared with prior art, especially compared with CN102433513A, Pd is substituted Mo and reduces C content by the present invention, and the hot strength of steel does not reduce, and is improved on the contrary, and its mechanism needs to be studied further.
The low-alloy heat-resistant high-strength steel component adopting the present invention to prepare, has higher mechanical properties, yield-point and surface hardness.
Embodiment
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1
A kind of low-alloy heat-resistant high-strength steel and component thereof, it is prepared by following steps,
(1) design the composition of described low-alloy heat-resistant high-strength steel, with weight (%), comprise: C 0.05, Si 0.1, Mn 0.2, Cr 1.2, Pd 0.4, P0.009, S0.006, Ni 0.3, Cu 0.05, V 0.35, Nb 0.15, W 0.3, Ti 0.01, surplus is Fe and inevitable impurity;
(2) smelt cast, comprise electric arc furnace and just refine, ladle RH process and LF process, control molten steel and meet the rear cast of chemical composition requirement, wherein carry out Argon 5 minutes with the pressure of 5atm during ladle refining, remove with the floating being conducive to impurity;
(3) rolling, comprises equal thermal treatment, rolling and cooling, and wherein all thermal treatment is soaking 5 hours in the process furnace of 1130 DEG C, and the start rolling temperature of rolling is 1050 DEG C, finishing temperature is 860 DEG C, and speed of cooling is 8 DEG C/s, final cooling temperature is 670 DEG C;
(4) processing of component, is processed into the size and dimension of needs, prepares component by the low-alloy heat-resistant high-strength steel after rolling;
(5) thermal treatment of component, after component is put into carburizing treatment stove with vertical state, here vertical state refers to and keeps vertical being as the criterion with the one dimension that components three-dimensional is the longest as far as possible, be heated to 890 DEG C, and with the speed of 90 droplets/minute instillation methyl alcohol, flow simultaneously by controlling propane to maintain in stove carbon potential 0.85%, carry out diffusion carburizing treatment 2 hours, subsequently component is pre-chilled to 760 DEG C reduce carbon potential to 0.7% in stove simultaneously and be incubated 10 minutes, then component is taken out from cementing furnace and be direct quenching in the cooling oil of 125 DEG C in oil temperature, tempering is carried out again after quenching, tempering temperature is 170 DEG C, tempering time is 1.5 hours.
Obtain low-alloy heat-resistant high-strength steel component of the present invention.
Comparative example 1
According to method described in embodiment 1, the composition of low-alloy heat-resistant high-strength steel in embodiment 1 is replaced with, the composition of described low-alloy heat-resistant high-strength steel, with weight (%), comprise: C 0.1, Si 0.1, Mn 0.2, Cr 1.2, Mo 0.4, P 0.009, S 0.006, Ni 0.3, Cu 0.05, V 0.35, Nb 0.15, W 0.3, Ti 0.01, surplus is Fe and inevitable impurity.Obtain the steel beam column of comparative example 1.
Comparative example 2
According to method described in embodiment 1, the composition of low-alloy heat-resistant high-strength steel in embodiment 1 is replaced with, the composition of described low-alloy heat-resistant high-strength steel, with weight (%), comprise: C 0.05, Si 0.1, Mn 0.2, Cr 1.2, Mo 0.4, P 0.009, S 0.006, Ni 0.3, Cu 0.05, V 0.35, Nb 0.15, W 0.3, Ti 0.01, surplus is Fe and inevitable impurity.Obtain the steel beam column of comparative example 2.
Comparative example 3
According to method described in embodiment 1, the composition of low-alloy heat-resistant high-strength steel in embodiment 1 is replaced with, the composition of described low-alloy heat-resistant high-strength steel, with weight (%), comprise: C 0.1, Si 0.1, Mn 0.2, Cr 1.2, Pd 0.4, P 0.009, S 0.006, Ni 0.3, Cu 0.05, V 0.35, Nb 0.15, W 0.3, Ti 0.01, surplus is Fe and inevitable impurity.Obtain the steel beam column of comparative example 3.
Test case
Carry out performance test to the steel beam column that embodiment 1 and comparative example 1-3 obtain, testing standard and test result are in table 1.
Table 1: steel beam column performance test table
| Mechanical properties (MPa) | Yield-point (MPA) | Surface hardness (HV) | |
| Embodiment 1 | 652 | 388 | 778 |
| Comparative example 1 | 612 | 372 | 740 |
| Comparative example 2 | 615 | 374 | 750 |
| Comparative example 3 | 620 | 381 | 765 |
The above; be only the specific embodiment of the present invention; but protection scope of the present invention is not limited thereto; any those of ordinary skill in the art are in the technical scope disclosed by the present invention; the change can expected without creative work or replacement, all should be encompassed within protection scope of the present invention.Therefore, the protection domain that protection scope of the present invention should limit with claims is as the criterion.
Claims (4)
1. a low-alloy heat-resistant high-strength steel, by weight percentage, comprises following component: C 0.04 ~ 0.06, Si 0.06 ~ 0.2, Mn 0.06 ~ 0.35, Cr 1.3 ~ 1.5, Pd 0.35 ~ 0.45, P≤0.009, S≤0.006, Ni 0.2 ~ 0.4, Cu 0.01 ~ 0.08, V 0.3 ~ 0.4, Nb 0.1 ~ 0.2, W 0.2 ~ 0.5, Ti 0.005 ~ 0.02, surplus is Fe and inevitable impurity.
2. a preparation method for low-alloy heat-resistant high-strength steel component, comprises the steps:
The first, the composition of design low-alloy heat-resistant high-strength steel, with weight, comprise: C 0.04 ~ 0.06, Si 0.06 ~ 0.2, Mn 0.06 ~ 0.35, Cr 1.3 ~ 1.5, Pd 0.35 ~ 0.45, P≤0.009, S≤0.006, Ni 0.2 ~ 0.4, Cu 0.01 ~ 0.08, V 0.3 ~ 0.4, Nb 0.1 ~ 0.2, W 0.2 ~ 0.5, Ti 0.005 ~ 0.02, surplus is Fe and inevitable impurity;
The second, smelt cast;
3rd, rolling;
4th, the processing of component;
5th, the thermal treatment of component.
3. the preparation method of low-alloy heat-resistant high-strength steel component as claimed in claim 2, comprises the steps:
The first, design the composition of described low-alloy heat-resistant high-strength steel, with weight, comprise: C 0.04 ~ 0.06, Si 0.06 ~ 0.2, Mn 0.06 ~ 0.35, Cr 1.3 ~ 1.5, Pd 0.35 ~ 0.45, P≤0.009, S≤0.006, Ni 0.2 ~ 0.4, Cu 0.01 ~ 0.08, V 0.3 ~ 0.4, Nb 0.1 ~ 0.2, W 0.2 ~ 0.5, Ti 0.005 ~ 0.02, surplus is Fe and inevitable impurity;
The second, smelt cast, comprise electric arc furnace and just refine, ladle RH process and LF process, control molten steel and meet the rear cast of chemical composition requirement, the pressure wherein with more than 3atm during ladle refining carries out Argon at least 5 minutes, removes with the floating being conducive to impurity;
3rd, rolling, comprise equal thermal treatment, rolling and cooling, wherein all thermal treatment is soaking at least 4 ~ 6 hours in the process furnace of about 1100 ~ 1150 DEG C, the start rolling temperature of rolling is about 1000 ~ 1100 DEG C, finishing temperature is about 840 ~ 880 DEG C, and speed of cooling is about 5 ~ 10 DEG C/s, final cooling temperature is about 650 ~ 680 DEG C;
4th, the processing of component, is processed into the size and dimension of needs, prepares component by the low-alloy heat-resistant high-strength steel after rolling;
5th, the thermal treatment of component, after component is put into carburizing treatment stove with vertical state, be heated to about 870 ~ 900 DEG C, and with the speed of about 80 ~ 100 droplets/minute instillation methyl alcohol, flow simultaneously by controlling propane to maintain in stove carbon potential 0.8 ~ 0.9%, carry out diffusion carburizing treatment about 2 ~ 2.5 hours, subsequently component is pre-chilled to about 750 ~ 780 DEG C and reduces in stove carbon potential to about 0.7 ~ 0.75% and insulation about 5 ~ 10 minutes simultaneously, then component taken out from cementing furnace and be about direct quenching in the cooling oil of 120 ~ 140 DEG C in oil temperature, tempering is carried out again after quenching, tempering temperature is about 160 ~ 180 DEG C, tempering time is about 1 ~ 1.5 hour.
4. a low-alloy heat-resistant high-strength steel component, adopts method described in claim 2 and 3 to be prepared from.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105312854A (en) * | 2015-10-23 | 2016-02-10 | 中冶陕压重工设备有限公司 | Method for manufacturing housing wear-resisting plate of metallurgical hot mill |
| CN106756622A (en) * | 2016-12-04 | 2017-05-31 | 丹阳市宸兴环保设备有限公司 | A kind of agitator revolves oar alloy steel material |
| CN109182896A (en) * | 2018-08-24 | 2019-01-11 | 中石化四机石油机械有限公司 | A kind of 175MPa movable elbow material and heat treatment process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105312854A (en) * | 2015-10-23 | 2016-02-10 | 中冶陕压重工设备有限公司 | Method for manufacturing housing wear-resisting plate of metallurgical hot mill |
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| CN109182896B (en) * | 2018-08-24 | 2021-02-19 | 中石化四机石油机械有限公司 | 175MPa movable elbow material and heat treatment process |
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| CN104630652B (en) | 2017-03-01 |
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