CN101063190A - Martensite heat-resisting steel - Google Patents
Martensite heat-resisting steel Download PDFInfo
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- CN101063190A CN101063190A CN 200610046384 CN200610046384A CN101063190A CN 101063190 A CN101063190 A CN 101063190A CN 200610046384 CN200610046384 CN 200610046384 CN 200610046384 A CN200610046384 A CN 200610046384A CN 101063190 A CN101063190 A CN 101063190A
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Abstract
The invention discloses a martensite heat-resisting steel, which is characterized by the following: setting main constituent of the alloy as 0. 05-0. 09 C, 10. 5-12. 0 Cr, 1. 40-1. 80 Ni, 0. 35-0. 50 Mo, 0. 15-0. 25 V, 0. 05-0. 15 Nb, not more than 0. 60 Si, not more than 0. 60 Mn, not more than 0. 020, not more than 0. 030 P, not more than 0. 30 Cu and surplus as Fe. This alloy possesses higher intensity good ductibility and corrosion resistance.
Description
Technical field:
The present invention relates to a kind of can be in the martensite Refractory Steel of life-time service below 600 ℃.
Background technology:
The 1Cr11Ni2W2MoV alloy, composition is, weight percent: C0.10～0.16, Cr10.5～12.0, Ni1.40～1.80, Mo0.35～0.50, V0.18～0.30, Si≤0.60, Mn≤0.60, S≤0.020, P≤0.030, Cu≤0.30, W0.70～1.00, Fe surplus, it is a kind of martensite refractory stainless steel, the room temperature strength of this steel, creep rupture strength are all higher, and good toughness and antioxidant property are arranged, solidity to corrosion is preferably arranged in fresh water and wet air.This steel is applicable to be manufactured on and reaches the wet condition load spare of work down below 550 ℃.Its shortcoming is that (1) weldability is poor, and postwelding must in time be heat-treated.(2) stress corrosion sensitivity, part easily lost efficacy under the stress long term.
Summary of the invention:
The object of the present invention is to provide a kind of martensite Refractory Steel, this alloy has higher intensity, and good plasticity and erosion resistance possess good weldability simultaneously.
The present invention specifically provides a kind of martensite Refractory Steel, the main component that it is characterized in that described alloy is weight percent: C0.05～0.09, Cr10.5～12.0, Ni1.40～1.80, Mo0.35～0.50, V0.15～0.25, Nb0.05～0.15, Si≤0.60, Mn≤0.60, S≤0.020, P≤0.030, Cu≤0.30, Fe surplus.
The present invention also provides the heat treating method of above-mentioned martensite Refractory Steel, it is characterized in that: at 1000～1050 ℃ of oil quenchings, and 630～670 ℃ of tempering, perhaps 540～570 ℃ of tempering.
Alloy element in the martensite Refractory Steel of the present invention has 6 kinds, and its effect in alloy is as follows respectively:
Carbon in the martensite Refractory Steel of the present invention can enlarge the γ phase region, and along with the increase of carbon content, the intensity of alloy, hardness increase, and plasticity, toughness descend.
Chromium in the martensite Refractory Steel of the present invention can improve intensity, the hardness of steel, and seldom reduces elasticity, can improve the heat-resisting and antioxidant property of steel.
Nickel in the martensite Refractory Steel of the present invention can improve the hardenability of steel, stainless, anti-oxidant and heat-stable performance that chromium-nickel steel has.
Molybdenum in the martensite Refractory Steel of the present invention can improve tensile strength, thermotolerance, and welding property is had desirable influence, and when molybdenum and chromium, when the nickel combination is used for steel alloy jointly, molybdenum can improve yield-point and tensile strength.
Vanadium in the martensite Refractory Steel of the present invention improves thermohardening, and the grain growth that slows down, and can form strong carbide, improves the tensile strength and the yield strength of steel.
Niobium in the martensite Refractory Steel of the present invention can increase temper resistance, and the secondary hardening effect is arranged; Owing to fixed carbon and precipitation hardening effect are arranged, can improve the creep property of steel; The crystal grain thinning effect is arranged, improve the impelling strength of steel, and reduce brittle transition temperature, trace niobium can not influence plasticity and toughness and the intensity that improves.
Compare martensite Refractory Steel of the present invention with OCr11Ni2MoVNb following advantage arranged:
(1) performance comparison after the identical system thermal treatment
1. tempering more than 620 ℃, OCr11Ni2MoVNb tensile strength of alloys of the present invention, relative reduction in area and hardness all are higher than the 1Cr11Ni2W2MoV alloy.
2. tempering more than 600 ℃, the yield strength of OCr11Ni2MoVNb alloy of the present invention is higher than the 1Cr11Ni2W2MoV alloy.
3. the OCr11Ni2MoVNb alloy tempering range broad of desired strength, hardness that meets the specification, this is control easily on producing.
(2) under identical salt air corrosion condition, the solidity to corrosion of OCr11Ni2MoVNb alloy of the present invention is higher than the 1Cr11Ni2w2MoV alloy.
(3) after identical system thermal treatment, the crystal grain of OCr11Ni2MoVNb alloy of the present invention is thin than the 1Cr11Ni2w2MoV alloy.
(4) welding property of OCr11Ni2MoVNb alloy of the present invention is better than 1Cr11Ni2w2MoV alloy.
In a word, the present invention has determined production technique by optimizing alloying constituent, thermal treatment process; Phase composite analysis, structure property by material concern research, thermal treatment process to tissue, Study on Influence, solidity to corrosion and oxidation resistance test, thereby make alloy reach the higher quality level.
Description of drawings:
Fig. 1 is OCr11Ni2MoVNb and 1Cr11Ni2W2MoV intensity contrast;
Fig. 2 is OCr11Ni2MoVNb and the contrast of 1Cr11Ni2W2MoV plasticity;
Fig. 3 is OCr11Ni2MoVNb and the contrast of 1Cr11Ni2W2MoV ballistic work;
Fig. 4 is OCr11Ni2MoVNb and the contrast of 1Cr11Ni2W2MoV hardness;
Fig. 5 is the influence of quenching temperature to intensity;
Fig. 6 is the influence of quenching temperature to plasticity;
Fig. 7 is that quenching temperature is to effects of tensile strength;
Fig. 8 is the influence of quenching temperature to yield strength;
Fig. 9 is the influence of quenching temperature to unit elongation;
Figure 10 is the influence of quenching temperature to reduction of area;
Figure 11 is the influence of quenching temperature impact value;
Figure 12 is the influence of quenching temperature to hardness;
Figure 13 is the influence of cool time to intensity;
Figure 14 is the influence of cool time to plasticity;
Figure 15 is the influence of cool time impact value and hardness;
Figure 16 is the influence of tempering time to intensity;
Figure 17 is the influence of tempering time to plasticity;
Figure 18 is the influence of tempering time to impact value and hardness;
Figure 19 is the influence of tempering temperature to intensity;
Figure 20 is the influence of tempering temperature to plasticity;
Figure 21 is the influence of tempering temperature to impact value and hardness.；
Embodiment:
Adopt vacuum induction+esr duplex technology to smelt the 0Cr11Ni2MoVNb alloy, its chemical ingredients sees Table the embodiment 1,2 in 1.
Table 1 test material chemical component weight %
| Material | C | Si | Mn | S | P | Cr | Ni | Mo | Nb | V | | Fe |
| Embodiment | ||||||||||||
| 1 | 0.059 | 0.32 | 0.41 | 0.009 | 0.014 | 11.30 | 1.72 | 0.44 | 0.098 | 0.20 | | |
| Embodiment | ||||||||||||
| 2 | 0.07 | 0.18 | 0.38 | 0.004 | 0.015 | 11.39 | 1.57 | 0.39 | 0.08 | 0.15 | Surplus | |
| 1Cr11Ni2W2MoV | 0.12 | 0.36 | 0.38 | 0.008 | 0.014 | 11.19 | 1.81 | 0.45 | - | 0.24 | 1.69 | Surplus |
By on the metallograph as can be seen, the original structure of OCr11Ni2MoVNb of the present invention is a tempered martensite, grain fineness number is about 9～10 grades, and is even from the irregular colour of metallographic, it is martensite or low-temperaturetempering martensite that part is arranged.Fig. 1～4 have provided the performance comparison of embodiment 10Cr11Ni2MoVNb alloy bar material and 1Cr11Ni2W2MoV alloy bar material, by Fig. 1～4 as can be seen, material is after 1010 ℃ of quenchings, when being higher than 620 ℃ of tempering, 0Cr11Ni2MoVNb strength of alloy, relative reduction in area and hardness all are higher than the 1Cr11Ni2W2MoV alloy greatly; When being higher than 590 ℃ of tempering, the unit elongation of 1Cr11Ni2W2MoV alloy is greater than the 0Cr11Ni2MoVNb alloy greatly; When being higher than 600 ℃ of tempering, the yield strength of 0Cr11Ni2MoVNb alloy is higher than the 1Cr11Ni2W2MoV alloy greatly.
With embodiment 20Cr11Ni2MoVNb alloy and 1Cr11Ni2W2MoV alloy, in the 5%NaCl aqueous solution, carry out salt spray corrosion test, the solidity to corrosion of 0Cr11Ni2MoVNb alloy is better than the 1Cr11Ni2W2MoV alloy.
Quenching temperature is seen Fig. 5,6 to the influence of mechanical property, and with the raising of quenching temperature, tensile strength, yield strength increase, and above after the technical qualification set upper limit quenching temperature (1050 ℃), intensity continues to increase, but plasticity slightly descends.
Under each quenching temperature, tempering temperature is seen Fig. 7～12 to the influence contrast of mechanical property.As can be seen, with the raising of tempering temperature, strength degradation, plasticity changes little, and impact value increases.As seen from Figure 7, under 1010 ℃ of quenchings of lesser temps, the tensile strength after the middle ceiling temperature tempering does not reach the technical qualification requirement, but comparatively high temps quenching (as 1050 ℃), in 640～670 ℃ of tempering ranges, tensile strength all reaches the technical qualification requirement.
The mechanical property of different tempering time materials is seen Figure 13～15 in cool time and the rules and requlations.As can be seen from Figure 13, the variation of cool time is more obvious to intensity effect, and with the prolongation of cool time, two kinds of intensity all have decline slightly, but the requirement that can both meet the specification under 3 kinds of time in test; Cool time is not very big to plasticity, toughness and hardness influence, the performance requirement that can both meet the specification after 3 kinds of cool time+655 ℃ * 2h tempering.
Tempering time is seen Figure 16～18 to the influence of mechanical property, and as can be seen, except the yield strength of air cooling was high slightly, the tempering type of cooling was not very big to the mechanical property influence of material; With the prolongation of tempering time, the strength degradation of material, tempering 1 hour, tensile strength can both meet the demands, tempering 2 hours, the tensile strength of water-cooled is low excessively, and 3 hours the tensile strength of having only air cooling of tempering can meet the demands, and tempering all can not meet the demands in 5 hours; The variation of tempering time is little to plasticity, toughness and the hardness influence of material.
Tempering temperature is seen Figure 19～21 to the influence of mechanical property, and as can be seen from the figure, with the rising of tempering temperature, the intensity plasticity of material slightly increases, and hardness has decline slightly; When being lower than 500 ℃ of tempering, the intensity of material has rising slightly, increases tempering temperature again, and intensity descends gradually; The impelling strength of material sharply descends when 500 ℃ of left and right sides tempering, and the temper brittleness district of judging this material is greatly about about 500 ℃.
Determining of temper brittleness, the impact value of 1040 ℃ of quenchings material after 400 ℃～560 ℃ tempering is seen Figure 12, as can be seen from the figure, and when 460 ℃～520 ℃ interval tempering, the impelling strength of material obviously reduces, and can determine that its temper brittleness district is at 460 ℃～520 ℃.
By above two embodiment, reach a conclusion:
0Cr11Ni2MoVNb original structure of the present invention is a tempered martensite, and grain fineness number is about 9～10 grades.
Material is after 1010 ℃ of quenchings, and when being higher than 620 ℃ of tempering, 0Cr11Ni2MoVNb strength of alloy, relative reduction in area and hardness all are higher than the 1Cr11Ni2W2MoV alloy greatly; When being higher than 590 ℃ of tempering, the unit elongation of 1Cr11Ni2W2MoV alloy is greater than the 0Cr11Ni2MoVNb alloy greatly; When being higher than 600 ℃ of tempering, the yield strength of 0Cr11Ni2MoVNb alloy is higher than the 1Cr11Ni2W2MoV alloy greatly.
The thermoplasticity of 0Cr11Ni2MoVNb alloy of the present invention is better.
0Cr11Ni2MoVNb alloy of the present invention is with the raising of quenching temperature, and tensile strength, yield strength increase, and grain-size is slightly grown up, but changes little.
0Cr11Ni2MoVNb alloy of the present invention is with the raising of tempering temperature, and strength degradation, plasticity change not quite, and impact value increases.
The variation of 0Cr11Ni2MoVNb alloy cool time of the present invention is more obvious to intensity effect, with the prolongation of cool time, two kinds of intensity all have decline slightly, and the cool time is not very big to plasticity, toughness and hardness influence, with the prolongation of cool time, crystal grain has slightly grows up.
The 0Cr11Ni2MoVNb alloy temper type of cooling of the present invention is not very big to the mechanical property influence of material, prolongation with tempering time, the strength degradation of material, the variation of tempering time is little to plasticity, toughness and the hardness influence of material, along with the prolongation of tempering time, the carbide of separating out is constantly grown up, is assembled.
0Cr11Ni2MoVNb alloy of the present invention is with the rising of tempering temperature, and the intensity plasticity of material slightly increases, and hardness has decline slightly; When being lower than 500 ℃ of tempering, the intensity of material has rising slightly, increases tempering temperature again, and intensity descends gradually; The impelling strength of material sharply descends when 500 ℃ of left and right sides tempering, and the temper brittleness district is at 460 ℃～520 ℃.
Claims (3)
1, a kind of martensite Refractory Steel, the main component that it is characterized in that described alloy is weight percent: C0.05～0.09, Cr10.5～12.0, Ni1.40～1.80, Mo0.35～0.50, V0.15～0.25, Nb0.05～0.15, Si≤0.60, Mn≤0.60, S≤0.020, P≤0.030, Cu≤0.30, Fe surplus.
2, the heat treating method of the described martensite Refractory Steel of a kind of claim 1 is characterized in that: at 1000～1050 ℃ of oil quenchings, and 630～670 ℃ of tempering.
3, the heat treating method of the described martensite Refractory Steel of a kind of claim 1 is characterized in that: in 540～570 ℃ of tempering of 1000～1050 ℃ of oil quenchings.
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| CN 200610046384 CN101063190A (en) | 2006-04-25 | 2006-04-25 | Martensite heat-resisting steel |
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| CN 200610046384 CN101063190A (en) | 2006-04-25 | 2006-04-25 | Martensite heat-resisting steel |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103614524A (en) * | 2013-12-09 | 2014-03-05 | 钢铁研究总院 | Heat treatment method for obtaining high durability of martensite heat-resistant steel |
| CN106319164A (en) * | 2016-10-10 | 2017-01-11 | 中国科学院金属研究所 | Heat treatment method of martensitic stainless steel |
| CN115369401A (en) * | 2022-08-19 | 2022-11-22 | 岭澳核电有限公司 | Corrosion-resistant layer material for laser cladding and preparation method and application thereof |
-
2006
- 2006-04-25 CN CN 200610046384 patent/CN101063190A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103614524A (en) * | 2013-12-09 | 2014-03-05 | 钢铁研究总院 | Heat treatment method for obtaining high durability of martensite heat-resistant steel |
| CN106319164A (en) * | 2016-10-10 | 2017-01-11 | 中国科学院金属研究所 | Heat treatment method of martensitic stainless steel |
| CN115369401A (en) * | 2022-08-19 | 2022-11-22 | 岭澳核电有限公司 | Corrosion-resistant layer material for laser cladding and preparation method and application thereof |
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