CN106834973A - A kind of economical high intensity austenitic stainless steel used for rail vehicle and its manufacture method - Google Patents
A kind of economical high intensity austenitic stainless steel used for rail vehicle and its manufacture method Download PDFInfo
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- CN106834973A CN106834973A CN201611236121.1A CN201611236121A CN106834973A CN 106834973 A CN106834973 A CN 106834973A CN 201611236121 A CN201611236121 A CN 201611236121A CN 106834973 A CN106834973 A CN 106834973A
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
Abstract
A kind of economical high intensity austenitic stainless steel used for rail vehicle and its manufacture method, its chemical composition mass percent is：C 0.03~0.12%, Si 0.4~0.8%, Mn 8.5~14.5%, Cr 14.0~15.5%, Ni 1.2~1.8%, N 0.15~0.25%, V≤0.15%, Ti≤0.10%, 0.05%≤V+Ti, Cu≤0.60%, P≤0.03%, S≤0.01%, balance of Fe and inevitable impurity；Its room-temperature yield strength >=400MPa, tensile strength >=700MPa, elongation percentage >=35%；Stainless steel of the present invention is applied to trolley coach, and manufacturing cost can be reduced on the premise of security requirement is met, and stainless steel of the present invention is applied to railway freight-car, and intensity can be improved while economy is ensured with service life, improves the lightweight level of vehicle.
Description
Technical field
The present invention relates to field of Austenitic stainless steel, and in particular to a kind of economical high intensity austenite used for rail vehicle is not
Rust steel and its manufacture method.
Background technology
In face of increasingly serious Environmental Protection Situation and increasingly harsh resources conservation requirement, greatly develop and perfect the public friendship in city
Entire body is tied to form as one of energy-saving measure taken is tackled in many countries and regions.As the carrier of public transit systems, city
The lightweight of city's rail vehicle and public transit vehicle itself and long service life also turn into inevitable development trend.With long-term iron in country
The appearance of circuit planning, railway freight at a high speed, heavy duty, long-lived requirement further enhance, current main of railway freight car
It is ferritic stainless steel with material,
Design feature, manufacturing process and use environment according to urban public transport vehicle, vehicle manufacture material need
Possess following characteristics：
1) strength and stiffness of vehicle safety are met；
2) corrosion resistance is good；
3) processability is good, disclosure satisfy that the requirement of the operations such as bending, shearing, punching press and welding in vehicle manufacturing process；
4) reasonable prices, meet that versatility is high, are easy to purchase and Eco-power requirement.
High strength carbon Steel material can meet the requirement of rail vehicle and public transit vehicle to intensity, but the corrosion resistance of carbon steel
It is poor, need to carry out application treatment when using.If from the cost of Life cycle and using considering, using the stainless of high intensity
Steel material, can both remove application step from, and the corrosion resistance of vehicle can be significantly increased again, so as to greatly improve vehicle ages.
The stainless steel of currently manufactured city rail friendship vehicle mainly has Europe superscript 1.4003, day to mark SUS301L and day mark SUS304,
The yield strength that the corrosion resistance of wherein 1.4003 stainless steels is better than under carbon steel, use state is essentially identical with high strength carbon steel, still
Vehicle further light-weighted demand can not be met；The high intensity of SUS301L stainless steels is mainly realized by cold work hardening, answered
Limited with position, and its chromium, nickel content are higher, cause relatively costly；The chromium of SUS304 stainless steels, nickel content are higher,
Intensity is less than 1.4003 and SUS301L, nor preferably rail vehicle lightweighting materials.
Railway freight car is mainly made using weathering steel and ferritic stainless steel at present, and the weathering steel of high grade exists
Intensity aspect meets the light-weighted requirement of car body, but its corrosion resistance is not improved, each repair in shop phase average thinning 1.44mm,
It is difficult to meet the railway freight car design service life requirement of 25 years；Ferritic stainless steel, particularly main use at present
T4003 stainless steels, have met the manufacture requirement of railway freight car in terms of economy and corrosion resistance, but its yield strength
Typically in 350~400MPa, also there is special requirement to the welding manner in vehicle manufacturing process.
At present, both at home and abroad some high intensity austenitic stainless steels such as：Chinese patent CN201110027216.3,
CN201210223960.5, CN201410294143.8, CN200810035045.7, CN200710038386.5 and Japan are specially
Sharp JP2000063998A discloses the chemical composition ranges of stainless steel, according to embodiment it is recognised that these stainless steels are in warm
Room-temperature yield strength both less than 400MPa during annealed condition is rolled, the product needed of final high intensity is by the cold rolling of aximal deformation value
Can just obtain, product elongation percentage reduction, production and processing operation is long.Cu contents are higher in wherein CN201110027216.3, unfavorable
In the recovery of stainless steel；Rare earth element ce, Chinese patent are with the addition of in Chinese patent CN201410294143.8
Cr contents are higher in CN200710038386.5, and Ni, Mo content are higher in Japan Patent JP2000063998A, all improve conjunction
Golden cost.
Chinese patent CN200810035045.7, CN200710134321.0, Japan Patent JP2001131713A,
JP200063998A, JP4450700B2, JP5618057B2, United States Patent (USP) US7767037B2, US8900511B2,
In US6764555B2 and European patent EP 0481377A2, containing alloy higher, such as Cr, Ni, Mo cause stainless steel
Cost increase.
Chinese patent CN200710039748.2 can obtain more than room-temperature yield strength 400MPa using TRIP effects
Stainless steel, but Ni elements are free of in its composition, Mn, N is fully relied on to adjust tissue, deformation induced martensite tendency is serious,
The elongation percentage of steel is compromised, and decay resistance is also weaker, improves the difficulty of production and processing.
The content of the invention
It is an object of the invention to provide the economical high intensity austenitic stainless steel used for rail vehicle of one kind and its manufacturer
Method, the room-temperature yield strength >=400MPa of the austenitic stainless steel, tensile strength >=700MPa, elongation percentage >=35%；This is not
Rust steel is applied to trolley coach, and manufacturing cost can be reduced on the premise of security requirement is met, and this stainless steel is applied to iron
Afloat car, can improve intensity while economy is ensured with service life, improve the lightweight level of vehicle.
To reach above-mentioned purpose, technical scheme is as follows：
Room-temperature yield strength of the existing high intensity austenitic stainless steel under hot-roll annealing state is general in 300MPa or so,
Its method for improving intensity is to form a large amount of hard and crisp strain-induced martensites after cold rolling by aximal deformation value, while intensity is improved
But the reduction of toughness and processability is unavoidably brought.To avoid this problem, by properly increasing manganese, nitrogen in steel in the present invention
The content of element, reduces the content of nickel in steel, and carbon, manganese, nitrogen coordinate the intensity for improving steel；It is a small amount of to reduce chromium content, while
The elements such as vanadium, titanium are added, the corrosion resistance of steel is ensured while thinning microstructure.
A kind of economical high intensity austenitic stainless steel used for rail vehicle, its chemical composition mass percent is：：C 0.03
~0.12%, Si 0.4~0.8%, Mn 8.5~14.5%, Cr 14.0~15.5%, Ni 1.2~1.8%, N0.15~
0.25%, V≤0.15%, Ti≤0.10%, 0.05%≤V+Ti, Cu≤0.60%, P≤0.03%, S≤0.01%, surplus
It is Fe and inevitable impurity.
The chemical composition of steel of the present invention meets formula Creq=14.8~16.2, Nieq=5.9~8.2, Md30/50=-70
~12.5,5.7≤(%Ni)+30 (%C)+0.33 (%Cu)+x (%N-0.045)≤10.5.
Wherein：
(the % of Creq=(%Cr)+1.5 (%Mo)+1.5 (%W)+0.48 (%Si)+1.75 (%Nb)+2.3 (%V)+2.5
Al)；
Nieq=(%Ni)+(%Co)+0.1 (%Mn) -0.01 (%Mn)2+ 18 (%N)+30 (%C)；
Md30/50=413-9.5 (%Ni) -13.7 (%Cr) -8.1 (%Mn) -9.2 (%Si) -462 (%C+%N)；
When (%N)=0~0.20, x=30；When (%N)=0.21~0.25, x=22.
In austenitic stainless steel of the present invention：
C：Carbon is the strong element for being formed, stablizing, expand austenite phase field, and C is to austenite structure at room temperature and intensity
Play a key effect, particularly in the present invention, Ni contents are relatively low, C acts on great in stable austenite organizational aspects；But
It is too high C content, the plasticity and decay resistance of steel can be influenceed, therefore, C content control is 0.03~0.12% in the present invention.
Si：Si is ferrite former, while Si too high levels can reduce the corrosion resistance of chromiumnickel austenite stainless steel simultaneously
Susceptibility To Intergranular Corrosion of the steel in solid solution state is improved, therefore to ensure that steel is at room temperature austenite structure and its corrosion resistance
Can be, it is necessary to Si contents in controlling steel；But in austenitic stainless steel smelting process, Si is used as deoxidier, in steel again
The Si of certain content must be contained, therefore Si contents are controlled 0.4~0.8% in the present invention.
Mn：Mn is weak austenite former, but is strong among the austenite stabilizing elements in stainless steel, and Mn can be notable
Solubility of the N in steel is improved, N content is higher in the present invention, and Ni contents are relatively low, it is therefore desirable to a certain amount of Mn elements, pass through
The compound action of Mn, N, C replaces part Ni, stable austenite tissue；But Mn has negative shadow to the decay resistance of stainless steel
Ring, the resistance to spot corrosion that can reduce steel too high of Mn contents, slit and corrosion resistant performance, thus in the present invention control of Mn contents 8.5~
14.5%.
Cr：Cr is most important alloying element in stainless steel, is to ensure the corrosion proof most basic element of stainless steel, with steel
Middle Cr contents increase, the Susceptibility To Intergranular Corrosion reduction of stainless steel, and intensity is improved, but plasticity and cold forming capability can be reduced, together
When Cr be ferrite former, too high levels are unhelpful to austenite structure stability, therefore consider, the present invention in Cr contain
Amount control is 14.0~15.5%.
Ni：Ni is important austenitic formation and stable element, can promote the stability of passivation film on stainless steel surface, is reduced tough crisp
Transition temperature, improves cold formability and weldability, while Ni is also expensive element, has important to the cost of austenitic stainless steel
Influence, therefore Ni contents are controlled 1.2~1.8% in the present invention.
N：The element of formation, stabilization and expansion austenite phase field of the N in stainless steel strongly, is made by solution strengthening
With N can significantly improve the room temperature and elevated temperature strength of austenitic stainless steel, and not significantly reduce the plasticity and toughness of steel, while N energy
Improve the acid-resistant corrosion and resistance to local corrosion performance of austenitic stainless steel；Because solubility of the N in stainless steel is limited, to keep away
Exempt to produce subcutaneous blowhole in process of setting, N must ensure exist with solid solution state with other elements coordinative role, consider this hair
The content of Mn, C in bright etc., N content control is 0.15~0.25% in the present invention.
V and Ti：Binding ability with C, N in steel is very strong, can reduce grain boundary carbide precipitation, lifts the resistance to crystalline substance of stainless steel
Between corrosive nature, V and Ti can also crystal grain thinning, improve stainless steel intensity, Ti also advantageously improves welding performance, while Ti can
TiC is combined to form with the S in steel2S compounds are preventing the spot corrosion caused by MnS；But Ti too high levels can make the surface of steel
The control of deterioration, V and Ti on Material Balance phase also has certain influence, therefore in the present invention, V content control 0.15% with
Under, Ti contents are controlled below 0.10%, and 0.05%≤V+Ti is ensured when both individually or simultaneously add.
Cu：Cu can improve the rustless property and corrosion resistance of stainless steel, the particularly effect in the reductants such as sulfuric acid more
For obvious, Cu can significantly reduce the intensity and cold work hardening tendency of stainless steel；But to Mn, N for Ni chromium manganese austenite
Cu is added in stainless steel, its delayed fracture sensitiveness will be far below chromiumnickel austenite stainless steel, and with Cu contents in steel
Increase, the thermoplasticity reduction of stainless steel, therefore Cu contents are controlled below 0.60% in the present invention.
P：P is the impurity element in steel, and the modeling, toughness and corrosion resistance to stainless steel are all adversely affected, and to be use up in production
P content control is below 0.03% during its content, therefore the present invention may be reduced.
S：S is the impurity element in steel, and the high temperature modeling, toughness and corrosion resistance to steel have illeffects, to be use up in production
The control of S contents is below 0.01% during its content, therefore the present invention may be reduced.
For stainless steel used for rail vehicle, rational welding tissue ensure that qualified welding performance, chemistry into
Divide and meet formula 5.7≤(%Ni)+30 (%C)+0.33 (%Cu)+x (%N-0.045)≤10.5 (when (%N)=0~0.20
When, x=30；When (%N)=0.21~0.25, x=22) ensure that austenitic stainless steel of the present invention welding process according to
Specific solidification model is reasonably organized, it is to avoid the defects such as HOT CRACK FOR WELDING P occur, so as to meet the welding of rail vehicle
Processing request.
It is contemplated that while improving austenite stainless hardness of steel, cost of alloy is reduced, in order to ensure Austria of stainless steel
Family name's body structure stability and intensity, so in terms of Composition Control, when C is near lower limit content, near upper limit content, C is near upper for N
During limit content, N is near lower limit content, while according to mentioned component, austenitic stainless steel of the present invention is after hot-roll annealing is smooth
Room-temperature yield strength >=400MPa.
The manufacture method of economical high intensity austenitic stainless steel used for rail vehicle of the invention, including：
1) smelt, cast
Smelted by composition described above, be cast as steel ingot or slab；
2) hot rolling
1200~1280 DEG C of hot rolling heating-up temperature, the heat time is determined by the thickness of steel ingot or slab, is 1~2min/mm,
Ensure homogeneous heating and do not produce some surface quality defects；Hot-rolled temperature is 980~1050 DEG C；
3) annealing and pickling
Annealing and pickling temperature is 1050~1120 DEG C, and annealing time is determined by the thickness of hot-strip, is 3~5min/mm；
4) it is smooth；Smooth drafts is 2.5~8.0%.
Preferably, above-mentioned smooth drafts is controlled 2.5~5.0%.From Md30/50Formula can be seen that of the invention
Stainless steel is producing true strain 30%, the temperature Md for 50% martensite occur30/50It it is -70~12.5 DEG C, i.e., in relatively low temperature
When, moderate finite deformation occurs can just form martensite, and pass through manufacture method step 4 at ambient temperature) the scope drafts
It is smooth, the strain-induced martensite phase of magnetic will not be produced in the tissue of steel, and dislocation density can be significantly improved, so as to improve steel band
Intensity, while smooth operation plays a part of to adjust plate shape again, eventually pass and the austenite of finished product obtained after cleaning by degreasing not
Rust steel plate strip, its room-temperature yield strength >=400MPa.
Compared with existing austenitic stainless steel used for rail vehicle, the invention has the advantages that：
Performance after conventional austenitic stainless steel material hot-roll annealing cannot meet the requirement of steel used for rail vehicle, it is necessary to
By quenched cold rolling raising intensity, by the cooperation of the elements such as Mn, N, C in the present invention, and add a certain amount of V, Ti performance N's
The refined crystalline strengthening effect of solution strengthening effect and V, Ti, by the smooth of small deformation amount after hot rolling solution treatment, improves Austria
Family name's body stainless steel yield strength at room temperature, eliminates cold rolling process, and manufacturing cost is significantly reduced, the present invention in austenite not
Room-temperature yield strength >=the 400MPa of rust steel finished product, tensile strength >=700MPa, elongation percentage >=35% meets steel used for rail vehicle
Requirement to performance.
The control of Mn, N, it is ensured that steel solid solution condition organization and performance, while reducing containing for precious metal element Ni
Amount, controls relatively low alloy content, it is ensured that the economy of product.
In smelting process, Si contents are controlled 0.4~0.8%, it is ensured that relatively low molten steel total oxygen content, while Si is carried
The adhesiveness of chromium oxide film high, is conducive to obtaining good surface quality.
Temperature control in hot rolling and annealing process, it is ensured that the ratio and stability of austenite structure.
Austenitic stainless steel steel plate according to different-thickness specification and the difference requirement to finished product mechanical property, in reasonable model
The drafts in interior appropriate adjustment formation process is enclosed, intensity is further improved while improving plate shape, it is ensured that finished product austenite is not
Rust steel yield strength is good fit with elongation percentage.
The yield strength of austenitic stainless steel of the present invention, tensile strength and elongation percentage are superior to existing equality strength rank
Trolley coach cold-rolling stainless steel and railway freight-car ferritic stainless steel, railcar is made using austenitic stainless steel of the present invention
, car body weight can be mitigated, car body strength is improved, meet lightweight requirements.
Brief description of the drawings
Fig. 1 is the room temperature micro-organization chart of the austenitic stainless steel that the embodiment of the present invention 3 is produced.
Specific embodiment
Invention is described further with reference to embodiment.
The embodiment composition of the economical austenitic stainless steel used for rail vehicle of the present invention as shown in table 1, balance of iron and not
Evitable impurity.End properties are as shown in table 2.
The manufacture method of the economical austenitic stainless steel used for rail vehicle of the present invention is comprised the following steps：
1) smelting, continuous casting
Smelted through electric furnace, AOD, VOD Triplex Refining or electric furnace, AOD two-step methods according to the chemical composition, after continuous casting
Obtain strand；
2) hot rolling
1200~1280 DEG C of hot rolling heating-up temperature, the heat time is determined by steel ingot or slab thickness, according to 1~2min/mm
Principle determine；980 DEG C~1050 DEG C of finishing temperature；
3) hot-roll annealing pickling
1050~1120 DEG C of annealing temperature, annealing soaking time is true according to the principle of 3~5min/mm according to strip thickness
It is fixed；
4) it is smooth
Smooth drafts control is 2.5~8.0%.
The embodiment of the present invention of table 1 and its comparative example chemical composition (unit：Wt%)
| C | Si | Mn | Cr | Ni | Cu | V | Ti | N | |
| Embodiment 1 | 0.059 | 0.486 | 11.80 | 14.90 | 1.52 | 0.54 | 0.105 | 0.080 | 0.159 |
| Embodiment 2 | 0.035 | 0.421 | 14.33 | 15.46 | 1.45 | 0.48 | 0.133 | -- | 0.237 |
| Embodiment 3 | 0.067 | 0.574 | 12.54 | 14.48 | 1.73 | 0.48 | 0.120 | 0.032 | 0.202 |
| Embodiment 4 | 0.110 | 0.630 | 8.55 | 14.87 | 1.39 | 0.37 | 0.082 | 0.061 | 0.162 |
| Embodiment 5 | 0.076 | 0.522 | 9.19 | 15.06 | 1.56 | 0.38 | -- | 0.061 | 0.171 |
| Embodiment 6 | 0.056 | 0.785 | 10.74 | 15.31 | 1.66 | 0.37 | 0.052 | 0.079 | 0.215 |
| Comparative example 1 | 0.010 | 0.7 | 1.1 | 17.1 | 6.8 | 0.3 | -- | -- | 0.15 |
| Comparative example 2 | 0.012 | 0.60 | 0.80 | 12.5 | 0.80 | -- | -- | 0.20 | 0.013 |
The embodiment of the present invention of table 2 and its comparative example technological parameter and mechanical property
Remarks：Comparative example 1 (AISI301-DLT), comparative example 2 (T4003).
Be can be seen that from the mechanical property and Fig. 1 of the embodiment of the present invention steel of table 2：
The mechanical property of embodiment of the present invention steel is suitable with stainless steel with the trolley coach of AIS301L-DLT grades, can be with
Meet the strength range requirement of Passenger Vehicle steel；
The mechanical property of embodiment of the present invention steel is better than the railway freight-car mechanical property of T4003 stainless steels, can meet
The intensity requirement of railway freight-car steel.
From the mechanical property of embodiment steel embodiment of the present invention steel gold under conditions of use is can be seen that with metallographic structure
Phase constitution is maintained as austenite structure, by the control to Flattening deformation amount, it is ensured that stainless structure of steel of the invention is equal
It is even, the strain-induced martensite of magnetic will not be produced.
The pitting potential of embodiment is can be seen that apparently higher than T4003 stainless steels from the pitting potential of embodiment, but is weaker than
AIS301L-DLT is, it is necessary to explanation, scope residing for the pitting potential of embodiment, ensure that the decay resistance of material expires
The requirement of sufficient railway freight-car service condition, while can adapt to the use environment of equality strength level orbit car stainless steel.
The composition design that the present invention passes through science, compared to comparative example trolley coach stainless steel, the cost of raw material is significantly
Reduce, and save cold-rolling process, production procedure simplifies, process is easily controlled, there is obvious cost under equality strength
Advantage；Compared to comparative example railway freight-car stainless steel, comprehensive mechanical property lifting, in situation of the thickness less than existing steel grade
Under, still with mechanical property even more excellent on an equal basis, there is stronger competitiveness in car body lightweight application aspect.
In sum, the high intensity low-nickel austenitic stainless steel that prepared by the present invention can be used for the lightweight of rail vehicle, warp
Ji type is manufactured, wide market.
Claims (5)
1. a kind of economical high intensity austenitic stainless steel used for rail vehicle, its chemical composition mass percent is：C 0.03~
0.12%, Si 0.4~0.8%, Mn 8.5~14.5%, Cr 14.0~15.5%, Ni 1.2~1.8%, N 0.15~
0.25%, V≤0.15%, Ti≤0.10%, 0.05%≤V+Ti, Cu≤0.60%, P≤0.03%, S≤0.01%, surplus
It is iron and inevitable impurity, it is also desirable to meet：
Creq=14.8~16.2, Nieq=5.9~9.2；Md30/50=-70~12.5；
(%Cu)≤10.5 of 5.7≤(%Ni)+30 (%C)+x (%N-0.045)+0.33,
When (%N)=0~0.20, x=30；
When (%N)=0.21~0.25, x=22.
2. economical high intensity austenitic stainless steel used for rail vehicle as claimed in claim 1, it is characterized in that, the stainless steel
Room-temperature yield strength >=400MPa, tensile strength >=700MPa, elongation percentage >=35%.
3. the manufacture method of economical high intensity austenitic stainless steel used for rail vehicle as claimed in claim 1, including：
1) smelt, cast
Composition is smelted, is cast as steel ingot or slab as described in claim 1；
2) hot rolling
1200~1280 DEG C of hot rolling heating-up temperature, the heat time is determined by the thickness of steel ingot or slab, is 1~2min/mm；Hot rolling
Temperature is 980~1050 DEG C；
3) annealing and pickling
Annealing and pickling temperature is 1050~1120 DEG C, and annealing time is determined by the thickness of hot-strip, is 3~5min/mm；
4) it is smooth；Smooth drafts is 2.5~8.0%.
4. the manufacture method of economical high intensity austenitic stainless steel used for rail vehicle as claimed in claim 2, its feature exists
In step 4) smooth drafts be 2.5~5.0%.
5. the manufacture method of economical high intensity austenitic stainless steel used for rail vehicle as claimed in claim 2, its feature exists
In the room-temperature yield strength >=400MPa of the stainless steel, tensile strength >=700MPa, elongation percentage >=35%.
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| CN201611236121.1A CN106834973B (en) | 2016-12-28 | 2016-12-28 | Economical high-strength austenitic stainless steel for railway vehicles and manufacturing method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109837470A (en) * | 2017-11-29 | 2019-06-04 | 宝钢不锈钢有限公司 | A kind of nitrogenous economical austenitic stainless steel of high intensity and its manufacturing method |
| CN112553533A (en) * | 2020-12-25 | 2021-03-26 | 宝钢德盛不锈钢有限公司 | Economical high-strength austenitic stainless steel |
| CN114807743A (en) * | 2021-02-01 | 2022-07-29 | 广西柳钢华创科技研发有限公司 | Chromium-manganese-nickel-nitrogen austenitic stainless steel |
Citations (5)
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| JP2000015447A (en) * | 1998-07-07 | 2000-01-18 | Nippon Steel Corp | Welding method of martensitic stainless steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109837470A (en) * | 2017-11-29 | 2019-06-04 | 宝钢不锈钢有限公司 | A kind of nitrogenous economical austenitic stainless steel of high intensity and its manufacturing method |
| CN109837470B (en) * | 2017-11-29 | 2022-04-01 | 宝钢德盛不锈钢有限公司 | High-strength nitrogen-containing economical austenitic stainless steel and manufacturing method thereof |
| CN112553533A (en) * | 2020-12-25 | 2021-03-26 | 宝钢德盛不锈钢有限公司 | Economical high-strength austenitic stainless steel |
| CN114807743A (en) * | 2021-02-01 | 2022-07-29 | 广西柳钢华创科技研发有限公司 | Chromium-manganese-nickel-nitrogen austenitic stainless steel |
| CN114807743B (en) * | 2021-02-01 | 2023-02-24 | 广西柳钢华创科技研发有限公司 | Chromium-manganese-nickel-nitrogen austenitic stainless steel |
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