CN102220465B - Heat treatment process of steel in low-alloy, high-strength and weather-proof structure - Google Patents
Heat treatment process of steel in low-alloy, high-strength and weather-proof structure Download PDFInfo
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- CN102220465B CN102220465B CN2010101462546A CN201010146254A CN102220465B CN 102220465 B CN102220465 B CN 102220465B CN 2010101462546 A CN2010101462546 A CN 2010101462546A CN 201010146254 A CN201010146254 A CN 201010146254A CN 102220465 B CN102220465 B CN 102220465B
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 40
- 239000000956 alloy Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 17
- 239000010959 steel Substances 0.000 title claims abstract description 17
- 238000010438 heat treatment Methods 0.000 title abstract description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 72
- 229910052742 iron Inorganic materials 0.000 claims abstract description 36
- 238000003466 welding Methods 0.000 claims abstract description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 4
- 239000011651 chromium Substances 0.000 claims abstract description 4
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 4
- 229910052802 copper Inorganic materials 0.000 claims abstract description 4
- 239000010949 copper Substances 0.000 claims abstract description 4
- 239000004615 ingredient Substances 0.000 claims abstract description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 3
- 239000011572 manganese Substances 0.000 claims abstract description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 3
- 239000011574 phosphorus Substances 0.000 claims abstract description 3
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 3
- 239000010703 silicon Substances 0.000 claims abstract description 3
- 238000007669 thermal treatment Methods 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 9
- 238000009413 insulation Methods 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 239000005864 Sulphur Substances 0.000 claims description 2
- 238000002791 soaking Methods 0.000 claims description 2
- 229910000746 Structural steel Inorganic materials 0.000 claims 1
- 238000000137 annealing Methods 0.000 abstract description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract 1
- 229910052717 sulfur Inorganic materials 0.000 abstract 1
- 239000011593 sulfur Substances 0.000 abstract 1
- 238000005098 hot rolling Methods 0.000 description 13
- 238000011282 treatment Methods 0.000 description 9
- 238000005260 corrosion Methods 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 125000004429 atom Chemical group 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000004453 electron probe microanalysis Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 235000019628 coolness Nutrition 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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- Heat Treatment Of Steel (AREA)
Abstract
The invention relates to the field of steel in a low-alloy, high-strength and weather-proof structure, in particular to a heat treatment process of the steel in the low-alloy, high-strength and weather-proof structure. The annealing heat treatment at the temperature of 500-650 DEG C is performed by adjusting the heat treatment process system after the heat treatment of the steel in the low-alloy, high-strength and weather-proof structure. By adopting the process, the mechanical properties of the steel in the weather-proof structure can be greatly improved and the problem that the heat treatment after welding can not be performed on the steel can be solved. The ingredients range by weight percent of components in the applicable steel in the weather-proof structure are as follows: carbon accounts for not more than 0.16%, chromium accounts for 0.40%-0.80%, copper accounts for 0.25%-0.55%, sulfur accounts for not more than 0.03%, phosphorus accounts for not more than 0.03%, silicon accounts for not more than 0.50%, manganese accounts for 0.50-1.50%, and the balance is iron and inevitable impurities.
Description
Technical field:
The present invention relates to low-alloy high-strength weathering structure iron field, is a kind of system of heat treatment process of low-alloy high-strength weathering structure iron specifically, and the thermal treatment process through after the hot-work of adjustment low-alloy high-strength weathering structure iron significantly improves its mechanical property.
Background technology:
Weather-proof structure iron has excellent mechanical property and corrosion resistance nature, simultaneously its cost be lower than stainless steel and corrosion resistance nature far above straight carbon steel, therefore obtained using widely.The low-alloy high-strength weathering structure iron that the present invention relates to is because of having good low-temperature impact toughness and welding property, is widely used in the field such as high-speed railway, bridge construction of China.Simultaneously, its good corrosion resisting property can satisfy the wide requirement to the steel grade corrosion resistance nature in China region.Yet in process of production, if adopt conventional normalizing treatment, its mechanical property does not only rise, and decline is by a relatively large margin arranged on the contrary behind the hot-rolled steel plate.Same problem also appears in the welding process of this weather-proof structure iron.Therefore, the heat treating regime after this alloy hot-work needs corresponding the improvement.
Summary of the invention:
The hot-work and the thermal treatment process that the purpose of this invention is to provide a kind of low-alloy high-strength weathering structure iron overcome this alloy and after hot-work, adopt conventional thermal treatment to cause the shortcoming of mechanical properties decrease, make it satisfy the requirement of service condition.
To achieve these goals, technical scheme of the present invention is:
Low-alloy high-strength weathering structure iron of the present invention, by the element mass percent, the chemical ingredients of alloy is following:
Carbon :≤0.16%; Chromium: 0.40-0.80%; Copper: 0.25-0.55%; Sulphur :≤0.03%; Phosphorus :≤0.03%; Silicon :≤0.50%; Manganese: 0.5-1.5%; Surplus is iron and unavoidable impurities.
Said low-alloy high-strength weathering structure iron, its hot-work and thermal treatment process comprise the steps:
1) ingot casting carries out alloy rolling under 1050 ± 10 ℃, and air cooling is to room temperature then;
2) between 500 ℃～650 ℃, after the insulation regular hour, air cooling is to room temperature;
3) soaking time be every millimeter 1～3 minute.
The present invention carries out 500～650 ℃ anneal after weather-proof structure iron hot-work, alleviated the unrelieved stress that hot-work causes, and has strengthened the pinning effect of interstitial atom, thereby obtains the weather-proof structure iron of higher mechanical property.
In order to improve the mechanical property of low-alloy high-strength weathering structure iron,, taked following measure according to above-mentioned strengthening mechanism:
The present invention is promoted the mechanical property of this alloy by a relatively large margin, thereby satisfies the requirement of its service condition through after weather-proof structure iron hot-work, carrying out 500～650 ℃ anneal.
The invention has the advantages that:
1, the present invention has significantly improved the mechanical property of low-alloy high-strength weathering structure iron, makes alloy have tangible yield point elongation, and the ys of alloy is higher than 380MPa, and tensile strength is greater than 510MPa, and unit elongation surpasses 30%.
2, the present invention can solve after this weather-proof structure iron welding can not thermal treatment or thermal treatment after the problem that reduces of performance.
Description of drawings:
Fig. 1 is a low-alloy high-strength weathering structure iron process flow sheet.
Fig. 2 (a)-(b) is the microstructure picture of low-alloy high-strength weathering structure iron different heat treatment system.
Wherein, 880 ℃ of normalizing treatment (opticmicroscope 200 *) after Fig. 2 (a) hot rolling; 650 ℃ of anneal (opticmicroscope 200 *) after Fig. 2 (b) hot rolling.
Fig. 3 is room temperature tensile stress-strain curve under the different heat treatment temperature after the hot rolling.
Fig. 4 (a)-(b) is respectively the C element electron probe microanalysis result through the weather-proof structure iron of 880 ℃ of normalizing treatment and 650 ℃ of anneal.
Embodiment:
Adopt conventional raw materials such as technically pure iron, graphite, manganese metal, chromium, copper, alloying constituent is seen table 1.
The chemical ingredients of table 1 alloy
Concrete production technique such as Fig. 1, the actually operating step is following:
1) with the above-mentioned starting material CaO crucible of packing into, carry out vacuum induction melting, intensification melting, casting, treat that ingot casting solidifies fully after, die sinking is taken out;
2) ingot casting is carried out alloy forging behind 1150 ℃ of insulation 2h, the excision rising head finally is swaged into the thick sheet material of 30mm;
3) behind 1050～1100 ℃ of insulation 1h, be rolled, air cooling obtains the sheet material that thickness is 14mm then;
4) at 650 ℃ of insulation 30min, take out air cooling then;
Table 2 is the Mechanics Performance Testing result of heat treatments at different after the hot rolling of low-alloy high-strength weathering structure iron.
The relation of table 2 mechanical property and thermal treatment temp (probe temperature: room temperature)
| Heat treating regime | Surrender/MPa | Tension/MPa | Extension/% |
| Hot rolling+880 ℃ normalizing | 282 | 573 | 35.8 |
| Hot rolling+500 ℃ annealing | 383 | 519 | 38.6 |
| Hot rolling+650 ℃ annealing | 387 | 520 | 32.8 |
| Hot rolling+880 ℃ normalizing+650 ℃ of annealing | 385 | 508 | 34.3 |
As shown in Figure 2, (a) and (b) are respectively the microtexture photo when adopting 880 ℃ of normalizings and 650 ℃ of annealing thermal treatments after the hot rolling of low-alloy high-strength weathering structure iron.This alloy records Ac through plavini
3Be 845 ℃, therefore setting its normalizing temperature is 880 ℃.As can be seen from Figure 2, two kinds of thermal treatment gained microtextures are formed by perlite and ferritic.(a) ferrite grain size is apparently higher than (b) in, but its perlite form is different with (b), and content also more hangs down.Its mechanical property is seen table 2, can find out, the ys of alloy has only 282MPa after 880 ℃ of normalizing treatment; And the intensity of alloy reaches 387MPa after 650 ℃ of anneal, and unit elongation does not obviously descend simultaneously.
Embodiment 2
Adopt composition design and the production technique of embodiment 1, after the hot-rolled steel plate cooling, at 500 ℃ of insulations 30min, air coolings then.The Mechanics Performance Testing result sees table 2.Can find out, the steel plate after the hot rolling through 500 ℃ of anneal after, ys can reach 380MPa, unit elongation surpasses 35%, with traditional 880 ℃ of normalizing process relatively, performance obviously promotes.The tensile stress-strain curve of heat treatments at different is as shown in Figure 3 after the hot rolling.Tangible yield phenomenon in the room temperature tensile process, do not occur 880 ℃ of normalizing treatment after the hot rolling, and ys has only 282MPa; And tangible yield phenomenon has appearred in the stress strain curve after 500 ℃ and the 650 ℃ of anneal, and ys reaches 380MPa.
Adopt composition design and the production technique of embodiment 1, after the hot-rolled steel plate cooling, carry out normalizing treatment at 880 ℃ earlier, carry out anneal at 650 ℃ then, institute's ergometry results of property is seen table 2.Can find out that the steel plate ys that 880 ℃ of normalizings add 650 ℃ of anneal reaches 385MPa, than the MPa more than 100 that exceeds of 880 ℃ of normalizing treatment, this welding process for this steel plate is significant.Temperature is very high in the steel plate welding process, and the process of welding postcooling just is equivalent to normalizing treatment, and this moment, commissure intensity was very low; If increase by 650 ℃ of annealed technologies together, then the mechanical property of whole welding steel can be increased dramatically.
Fig. 4 (a) and (b) be respectively C element electron probe microanalysis result through the weather-proof structure iron of 880 ℃ of normalizing treatment and 650 ℃ of anneal.(a) partial poor carbon district (shown in arrow) occurs among the figure, reduced the pinning effect of C atom in the alloy deformation process; Distribute more evenly and go out outside the cementite C atom (b), because the strengthening effect of interstitial atom, the ys of alloy significantly promotes.In view of the above; The thermal treatment temp that the present invention sets after the hot rolling of low-alloy high-strength weathering structure iron is 500～650 ℃; Its theoretical foundation is to carry out 500～650 ℃ anneal after the weather-proof structure iron hot-work; Alleviate the unrelieved stress that hot-work causes, strengthened the pinning effect of interstitial atom, thereby obtained the weather-proof structure iron of higher mechanical property.
Adopt the low-alloy high-strength weathering structure iron of the present invention's technology preparation; Not only intensity has obtained lifting by a relatively large margin; The unit elongation and the corrosion resistance nature that have also kept higher level can satisfy the requirement of low-alloy high-strength weathering structure iron to intensity and corrosion resistance nature.
Claims (3)
1. the thermal treatment process of a low-alloy high-strength weathering structure iron is characterized in that, by the element mass percent, the chemical ingredients of alloy is following:
Carbon :≤0.16%; Chromium: 0.40-0.80%; Copper: 0.25-0.55%; Sulphur :≤0.03%; Phosphorus :≤0.03%; Silicon :≤0.50%; Manganese: 0.50-1.50%; Surplus is iron and unavoidable impurities;
Its thermal treatment process concrete steps are following:
1) ingot casting carries out alloy rolling under 1050 ± 10 ℃, and air cooling is to room temperature then;
2) between 500 ℃～650 ℃, insulation back air cooling is to room temperature;
3) soaking time be every millimeter 1～3 minute.
2. according to the thermal treatment process of the described low-alloy high-strength weathering of claim 1 structure iron, it is characterized in that the condition that is suitable for is the weather-proof structure iron through common Medium and Heavy Plate Rolling explained hereafter.
3. according to the thermal treatment process of the described low-alloy high-strength weathering of claim 1 structure iron, it is characterized in that the condition that is suitable for is the weather-proof structural steel and iron after welding through the steel plate process of controlled rolling production.
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| CN102409256A (en) * | 2011-11-09 | 2012-04-11 | 上海大学 | Method for preparing high-strength weathering steel based on carrier control technology |
| CN110819773A (en) * | 2019-11-04 | 2020-02-21 | 中国科学院金属研究所 | Heat treatment process for controlling banded structure of low-alloy high-strength weathering steel |
| CN112647018B (en) * | 2020-11-30 | 2022-04-05 | 中国科学院金属研究所 | Low-alloy high-strength high-weather-resistance structural steel for highway guardrail and preparation method thereof |
| CN112646958A (en) * | 2020-11-30 | 2021-04-13 | 中国科学院金属研究所 | Heat treatment process of low-alloy high-strength high-weather-resistance structural steel for highway guardrail |
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| JP2001303128A (en) * | 2000-04-26 | 2001-10-31 | Nkk Corp | Method for producing rolled weather resistant shape steel |
| CN101280395A (en) * | 2007-04-04 | 2008-10-08 | 江苏星火特钢有限公司 | High-manganses low-nickel nanometer precipitated phase austenite antibacterial stainless steel |
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