CN107904522A - A kind of double phase stainless steel alloy of high intensity and preparation method thereof - Google Patents

A kind of double phase stainless steel alloy of high intensity and preparation method thereof Download PDF

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CN107904522A
CN107904522A CN201710978385.2A CN201710978385A CN107904522A CN 107904522 A CN107904522 A CN 107904522A CN 201710978385 A CN201710978385 A CN 201710978385A CN 107904522 A CN107904522 A CN 107904522A
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stainless steel
phase stainless
high intensity
steel alloy
temperature
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刘晓
代巧
李兴成
于庆波
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Jiangsu University of Technology
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Jiangsu University of Technology
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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
    • 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
    • C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C30/00—Alloys containing less than 50% by weight of each constituent
    • 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
    • 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
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • 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
    • 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
    • C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
    • 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
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/001—Austenite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite

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  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

The invention discloses a kind of double phase stainless steel alloy of high intensity, belong to two phase stainless steel technical field, composition includes：C, S, P, Si, Mn, Cr, Ni, Mo, W, N, B, Fe and mixed rare earth of lanthanum and cerium；Also disclose the preparation method of the diphase stainless steel alloy material.The present invention has the advantages that to save nickel, also have it is good cast, be corrosion-resistant, processability and welding performance, available for structure steel is used under high chloride ion or corrosivity industrial environment, use the road and bridge steel plate of deicing salt, ocean enclosure wall or fortification steel, freeway bridge and road surface reinforcing bar etc..

Description

A kind of double phase stainless steel alloy of high intensity and preparation method thereof
Technical field
The present invention relates to a kind of diphase stainless steel alloy material and preparation method thereof, more particularly to a kind of the double of high intensity Phase stainless steel alloy and preparation method thereof, belongs to two phase stainless steel technical field.
Background technology
Two phase stainless steel because it has higher mechanical property and excellent corrosion resistance, ship, pulping and paper-making and The application aspects such as nuclear industry all occupy a tiny space.
Most important alloying component is chromium and nickel in two phase stainless steel, and wherein nickel is most expensive, to reduce production cost, drop Nickel content in low steel is general to use in a manner of nitrogen and manganese replace nickel.China is the relatively deficient country of a nickel resources, with The continuous growth of domestic stainless steel demand, will serious limitation China's stainless steel industry development, it is strong due to two phase stainless steel Degree is higher than austenitic stainless steel and light-weight, if bridge structure steel can significantly mitigate its weight using two phase stainless steel.
Not only the performance such as impact flexibility, weldability, fatigability is not ideal enough for traditional high-strength bridge steel, but also resistance to big Gas, marine corrosion etc. performance are worse, therefore, when high-grade bridge steel plate exploitation is carried out, not only to consider that its is strong Grade is spent, and to consider the performance such as welding, tired, corrosion-resistant, with the development of China railways bridge, China starts in depth Bridge construction under the rugged environments such as mountain, ocean, this not only needs the intensity of steel high, corrosion-resistant, but also the service life will also be grown, and therefore, open Send out light-weight, intensity is high, antifatigue, corrosion-resistant, long lifespan high-performance stainless steel material, extremely urgent.
In addition, the rare earth resources in China enrich, the microalloying effect of rare earth in steel has played more and more important Effect, research and develop high-performance nickel-saving type containing rare earth two phase stainless steel, as some special industry fields steel, such as bridge With steel etc., the nickel resources of preciousness can be saved, while can guarantee that corrosion-resistant requirement and intensity of the stainless steel under severe rugged environment again Etc. mechanical property requirements, by lot of experiments, we have developed a kind of high nitrogen super duplex containing rare earth of high chromium for saving nickel not Become rusty steel.
The content of the invention
The main object of the present invention is to provide for a kind of double phase stainless steel alloy of high intensity and preparation method thereof, with suitable The cheap nitrogen and manganese of amount stablize the austenite in two phase stainless steel, achieve the purpose that to reduce valuable nickel dosage.
The purpose of the present invention can reach by using following technical solution：
A kind of double phase stainless steel alloy of high intensity, includes the constituent of following mass percent：
C≤0.025%；
S≤0.005%；
P≤0.02%；
Si≤2.00%；
Mn：6.00~10.00%；
Cr：30.0~35.0%；
Ni：4.0~6.0%；
Mo：3.0~5.0%；
W：0.2-1.0%；
N：0.3~0.6%；
B：0.01~0.02%；
Mischmetal：0.01~0.1%；
Fe surpluses.
Further, the mischmetal is mixed rare earth of lanthanum and cerium.
Further, in the mixed rare earth of lanthanum and cerium, La≤48%, Ce≤45%.
Further, content summation >=99.7% of La and Ce is gone back in the mixed rare earth of lanthanum and cerium.
Further, in the mixed rare earth of lanthanum and cerium also containing praseodymium, neodymium, promethium, samarium rare earth element one or more.
A kind of preparation method of the double phase stainless steel alloy of high intensity, includes the following steps：Smelting, casting, ingot casting or casting Base cogging, hot rolling and solution treatment.
Further, specifically comprise the following steps：
Step 1：Smelt
External refining, converter is added to add any technique smelting in external refining using vaccum sensitive stove, air induced melting, electric furnace Refining；
Step 2：Ingot casting or ingot formation
Ingot casting or strand use hammer cogging or continuous casting and rolling；
Step 3：Hot rolling
Hot rolling is carried out to steel after ingot casting or ingot formation, blank heating temperature is 1150-1250 DEG C during hot rolling, open rolling temperature Spend for 1150-1200 DEG C, finishing temperature is 950-1050 DEG C；
Step 4：Solution treatment
Solution treatment is carried out after steel hot rolling in heat-treatment furnace, solid solubility temperature is 1050-1150 DEG C, keeps the temperature 30-60min Postcooling.
Further, in the step 1, rare earth metal is added before tapping casting is smelted, cast temperature is controlled in 1570- 1660℃。
Further, in the step 2, the heating-up temperature of hammer cogging or continuous casting and rolling is 1150-1300 DEG C, and cogging is begun It is 1150-1300 DEG C to forge temperature, and final forging temperature is 950-1050 DEG C.
Further, in the step 4, the type of cooling uses water cooling or air-cooled.
The advantageous effects of the present invention：The double phase stainless steel alloy of high intensity according to the invention, it is provided by the invention The double phase stainless steel alloy of high intensity, for deficiency of the existing two phase stainless steel in terms of cost of material, nickel is replaced with nitrogen and manganese Element, stable austenite, saves great amount of cost, in addition, after mixed rare earth of lanthanum and cerium element solid solution is in steel, can improve richness Cr passivation The stability of film, improves corrosion resistance；Rare earth element can also be enriched in crystal boundary, reduce impurity element in crystal boundary segregation, increase Grain-boundary strength, improves the resistance to corrosion and mechanical property of crystal boundary.
For alloy of the present invention with nitrogen for nickel, production cost is low, per ton with nickel price by steely iron alloy raw material cost accounting 100000 yuan of calculating, its steel production cost per ton reduce by 12% or so than OCr18Ni12Mo2Ti austenitic stainless steels, and saving takes With about 1200 yuan.Further, since alloy strength of the present invention is high and corrosion resistance is preferable, if so with its substitute 316L and The austenitic stainless steels such as OCr18Ni12Mo2Ti will cause the workpiece service life to increase substantially, thus will bring considerable economy and Social benefit, in addition, alloy of the present invention also have it is good cast, be corrosion-resistant, processability and welding performance, it is sudden and violent available for structure It is exposed under high chloride ion or corrosivity industrial environment and uses steel, using the road and bridge steel plate of deicing salt, ocean enclosure wall or defence Fortification steel, freeway bridge and road surface reinforcing bar etc..
Brief description of the drawings
Fig. 1 is strong for the embodiment 1-5 and comparative example elevated temperature tensile of the double phase stainless steel alloy of high intensity according to the invention Spend result of the test figure；
Fig. 2 is the embodiment 1-5 and comparative example drawing by high temperature of the double phase stainless steel alloy of high intensity according to the invention Can comparison diagram；
Fig. 3 is the embodiment 1-5 and comparative example drawing by high temperature of the double phase stainless steel alloy of Fig. 2 high intensity according to the invention Performance comparison figure continues；
Fig. 4 is the embodiment 1-5 and comparative example room temperature mechanical property of the double phase stainless steel alloy of high intensity according to the invention Can comparison diagram；
Fig. 5 is embodiment 1-5 and the comparative example of the double phase stainless steel alloy of high intensity according to the invention in boiling temperature 5% (wt.%) H2SO4Homogeneous corrosion performance in aqueous solution.
Embodiment
To make those skilled in the art more clear and clear and definite technical scheme, with reference to embodiment and attached drawing The present invention is described in further detail, but the implementation of the present invention is not limited to this.
Embodiment 1：
The present embodiment 1 provide a kind of high intensity double phase stainless steel alloy, including following mass percent composition into Point：
C：0.019%；
S：0.004%；
P：0.016%；
Si：1.75%；
Mn：8.16%；
Cr：31.26%；
Ni：4.35%；
Mo：3.15%；
W：0.38%；
N：0.33%；
B：0.011%；
Mischmetal：0.021%；
Fe surpluses.
Further, in the present embodiment 1, the mischmetal is mixed rare earth of lanthanum and cerium；In the mixed rare earth of lanthanum and cerium, La≤48%, Ce≤45%；Content summation >=99.7% of La and Ce is gone back in the mixed rare earth of lanthanum and cerium；The lanthanum cerium mixing is dilute In soil also containing praseodymium, neodymium, promethium, samarium rare earth element one or more.
A kind of preparation method of the double phase stainless steel alloy for high intensity that the present embodiment 1 provides, specifically comprises the following steps：
Step 1：Smelt
External refining, converter is added to add any technique smelting in external refining using vaccum sensitive stove, air induced melting, electric furnace Refining, adds rare earth metal before tapping casting is smelted, and cast temperature is controlled at 1570-1660 DEG C；
Step 2：Ingot casting or ingot formation
Ingot casting or strand use hammer cogging or continuous casting and rolling, and the heating-up temperature of hammer cogging or continuous casting and rolling is 1150- 1300 DEG C, cogging initial forging temperature is 1150-1300 DEG C, and final forging temperature is 950-1050 DEG C；
Step 3：Hot rolling
Hot rolling is carried out to steel after ingot casting or ingot formation, blank heating temperature is 1150-1250 DEG C during hot rolling, open rolling temperature Spend for 1150-1200 DEG C, finishing temperature is 950-1050 DEG C；
Step 4：Solution treatment
Solution treatment is carried out after steel hot rolling in heat-treatment furnace, solid solubility temperature is 1050-1150 DEG C, keeps the temperature 30-60min Postcooling, the type of cooling use water cooling or air-cooled.
Embodiment 2：
The present embodiment 2 provide a kind of high intensity double phase stainless steel alloy, including following mass percent composition into Point：
C：0.02%；
S：0.005%；
P：0.017%；
Si：1.36%；
Mn：8.65%；
Cr：32.75%；
Ni：4.66%；
Mo：3.72%；
W：0.72%；
N：0.37%；
B：0.013%；
Mischmetal：0.026%；
Fe surpluses.
Further, in the present embodiment 2, the mischmetal is mixed rare earth of lanthanum and cerium；In the mixed rare earth of lanthanum and cerium, La≤48%, Ce≤45%；Content summation >=99.7% of La and Ce is gone back in the mixed rare earth of lanthanum and cerium；The lanthanum cerium mixing is dilute In soil also containing praseodymium, neodymium, promethium, samarium rare earth element one or more.
A kind of preparation method of the double phase stainless steel alloy for high intensity that the present embodiment 2 provides, specifically comprises the following steps：
Step 1：Smelt
External refining, converter is added to add any technique smelting in external refining using vaccum sensitive stove, air induced melting, electric furnace Refining, adds rare earth metal before tapping casting is smelted, and cast temperature is controlled at 1570-1660 DEG C；
Step 2：Ingot casting or ingot formation
Ingot casting or strand use hammer cogging or continuous casting and rolling, and the heating-up temperature of hammer cogging or continuous casting and rolling is 1150- 1300 DEG C, cogging initial forging temperature is 1150-1300 DEG C, and final forging temperature is 950-1050 DEG C；
Step 3：Hot rolling
Hot rolling is carried out to steel after ingot casting or ingot formation, blank heating temperature is 1150-1250 DEG C during hot rolling, open rolling temperature Spend for 1150-1200 DEG C, finishing temperature is 950-1050 DEG C；
Step 4：Solution treatment
Solution treatment is carried out after steel hot rolling in heat-treatment furnace, solid solubility temperature is 1050-1150 DEG C, keeps the temperature 30-60min Postcooling, the type of cooling use water cooling or air-cooled.
Embodiment 3：
The present embodiment 3 provide a kind of high intensity double phase stainless steel alloy, including following mass percent composition into Point：
C：0.018%；
S：0.004%；
P：0.018%；
Si：1.48%；
Mn：9.10%；
Cr：33.21%；
Ni：5.35%；
Mo：3.96%；
W：0.65%；
N：0.42%；
B：0.016%；
Mischmetal：0.032%；
Fe surpluses.
Further, in the present embodiment 3, the mischmetal is mixed rare earth of lanthanum and cerium；In the mixed rare earth of lanthanum and cerium, La≤48%, Ce≤45%；Content summation >=99.7% of La and Ce is gone back in the mixed rare earth of lanthanum and cerium；The lanthanum cerium mixing is dilute In soil also containing praseodymium, neodymium, promethium, samarium rare earth element one or more.
A kind of preparation method of the double phase stainless steel alloy for high intensity that the present embodiment 3 provides, specifically comprises the following steps：
Step 1：Smelt
External refining, converter is added to add any technique smelting in external refining using vaccum sensitive stove, air induced melting, electric furnace Refining, adds rare earth metal before tapping casting is smelted, and cast temperature is controlled at 1570-1660 DEG C；
Step 2：Ingot casting or ingot formation
Ingot casting or strand use hammer cogging or continuous casting and rolling, and the heating-up temperature of hammer cogging or continuous casting and rolling is 1150- 1300 DEG C, cogging initial forging temperature is 1150-1300 DEG C, and final forging temperature is 950-1050 DEG C；
Step 3：Hot rolling
Hot rolling is carried out to steel after ingot casting or ingot formation, blank heating temperature is 1150-1250 DEG C during hot rolling, open rolling temperature Spend for 1150-1200 DEG C, finishing temperature is 950-1050 DEG C；
Step 4：Solution treatment
Solution treatment is carried out after steel hot rolling in heat-treatment furnace, solid solubility temperature is 1050-1150 DEG C, keeps the temperature 30-60min Postcooling, the type of cooling use water cooling or air-cooled.
Embodiment 4：
The present embodiment 4 provide a kind of high intensity double phase stainless steel alloy, including following mass percent composition into Point：
C：0.019%；
S：0.004%；
P：0.015%；
Si：1.15%；
Mn：9.75%；
Cr：34.58%；
Ni：5.68%；
Mo：4.55%；
W：0.88%；
N：0.45%；
B：0.015%；
Mischmetal：0.038%；
Fe surpluses.
Further, in the present embodiment 4, the mischmetal is mixed rare earth of lanthanum and cerium；In the mixed rare earth of lanthanum and cerium, La≤48%, Ce≤45%；Content summation >=99.7% of La and Ce is gone back in the mixed rare earth of lanthanum and cerium；The lanthanum cerium mixing is dilute In soil also containing praseodymium, neodymium, promethium, samarium rare earth element one or more.
A kind of preparation method of the double phase stainless steel alloy for high intensity that the present embodiment 4 provides, specifically comprises the following steps：
Step 1：Smelt
External refining, converter is added to add any technique smelting in external refining using vaccum sensitive stove, air induced melting, electric furnace Refining, adds rare earth metal before tapping casting is smelted, and cast temperature is controlled at 1570-1660 DEG C；
Step 2：Ingot casting or ingot formation
Ingot casting or strand use hammer cogging or continuous casting and rolling, and the heating-up temperature of hammer cogging or continuous casting and rolling is 1150- 1300 DEG C, cogging initial forging temperature is 1150-1300 DEG C, and final forging temperature is 950-1050 DEG C；
Step 3：Hot rolling
Hot rolling is carried out to steel after ingot casting or ingot formation, blank heating temperature is 1150-1250 DEG C during hot rolling, open rolling temperature Spend for 1150-1200 DEG C, finishing temperature is 950-1050 DEG C；
Step 4：Solution treatment
Solution treatment is carried out after steel hot rolling in heat-treatment furnace, solid solubility temperature is 1050-1150 DEG C, keeps the temperature 30-60min Postcooling, the type of cooling use water cooling or air-cooled.
Embodiment 5：
The present embodiment 5 provide a kind of high intensity double phase stainless steel alloy, including following mass percent composition into Point：
C：0.020%；
S：0.005%；
P：0.018%；
Si：1.10%；
Mn：9.58%；
Cr：34.72%；
Ni：4.72%；
Mo：4.38%；
W：0.57%；
N：0.40%；
B：0.017%；
Mischmetal：0.044%；
Fe surpluses.
Further, in the present embodiment 5, the mischmetal is mixed rare earth of lanthanum and cerium；In the mixed rare earth of lanthanum and cerium, La≤48%, Ce≤45%；Content summation >=99.7% of La and Ce is gone back in the mixed rare earth of lanthanum and cerium；The lanthanum cerium mixing is dilute In soil also containing praseodymium, neodymium, promethium, samarium rare earth element one or more.
A kind of preparation method of the double phase stainless steel alloy for high intensity that the present embodiment 5 provides, specifically comprises the following steps：
Step 1：Smelt
External refining, converter is added to add any technique smelting in external refining using vaccum sensitive stove, air induced melting, electric furnace Refining, adds rare earth metal before tapping casting is smelted, and cast temperature is controlled at 1570-1660 DEG C；
Step 2：Ingot casting or ingot formation
Ingot casting or strand use hammer cogging or continuous casting and rolling, and the heating-up temperature of hammer cogging or continuous casting and rolling is 1150- 1300 DEG C, cogging initial forging temperature is 1150-1300 DEG C, and final forging temperature is 950-1050 DEG C；
Step 3：Hot rolling
Hot rolling is carried out to steel after ingot casting or ingot formation, blank heating temperature is 1150-1250 DEG C during hot rolling, open rolling temperature Spend for 1150-1200 DEG C, finishing temperature is 950-1050 DEG C；
Step 4：Solution treatment
Solution treatment is carried out after steel hot rolling in heat-treatment furnace, solid solubility temperature is 1050-1150 DEG C, keeps the temperature 30-60min Postcooling, the type of cooling use water cooling or air-cooled.
Comparative example 1：
The 316L that comparative example 1 provides, includes the constituent of following mass percent：
C：0.034%；
S：0.015%；
P：0.007%；
Si：0.41%；
Mn：1.7%；
Cr：17.45%；
Ni：12.52%；
Mo：2.53%；
Fe surpluses.
Comparative example 2：
The OCr that comparative example 2 provides18Ni12Mo2Ti, includes the constituent of following mass percent：
C：0.041%；
S：0.014%；
P：0.010%；
Si：0.63%；
Mn：1.65%；
Cr：18.68%；
Ni：12.54%；
Mo：2.38%；
Fe surpluses.
Comparative example 3：
The 2205 two-way stainless steels that comparative example 3 provides, include the constituent of following mass percent：
C：0.023%；
S：0.006%；
P：0.022%；
Si：0.57%；
Mn：1.20%；
Cr：30.75%；
Ni：6.88%；
Mo：2.94%；
N：0.38%；
B：0.010%；
Fe surpluses.
In embodiment 1-5, tap and mixed rare earth of lanthanum and cerium is added before casting, after moulding by casting, after hot forging, then through necessarily Solution treatment, obtains the double phase stainless steel alloy of final high intensity, and the mechanical property sample of alloy of the present invention, corrosion test are used Sample and industrialness lacing film are directly laterally sampled from forging state semifinished product, are tested after 1080 DEG C × 40min water cooling solution treatment Performance.For ease of contrast, also UNS32906 two phase stainless steels, 316L and OCr18Ni12Mo2Ti austenite stainless have been smelted at the same time Steel.Contrast test carries out under the conditions of identical smelting, forging, heat treatment and corrosion test etc..
The chemical composition of alloy described in above-described embodiment and each compared steel, mechanical property, corrosion resistance and elevated temperature tensile Intensity experiment data are shown in Fig. 1 to Fig. 6；Fig. 1 be high intensity according to the invention double phase stainless steel alloy embodiment 1-5 with it is right Ratio Testing Tensile Strength at Elevated Temperature result of the test figure；Fig. 2 is the embodiment 1-5 of the double phase stainless steel alloy of high intensity according to the invention With comparative example high temperature tensile properties comparison diagram；Fig. 3 is the embodiment of the double phase stainless steel alloy of Fig. 2 high intensity according to the invention 1-5 continues with comparative example high temperature tensile properties comparison diagram；Fig. 4 is the implementation of the double phase stainless steel alloy of high intensity according to the invention Example 1-5 and comparative example room-temperature mechanical property comparison diagram；Fig. 5 is the implementation of the double phase stainless steel alloy of high intensity according to the invention Example 1-5 is with comparative example in boiling temperature 5% (wt.%) H2SO4Homogeneous corrosion performance in aqueous solution.
In conclusion in the present embodiment, for deficiency of the existing two phase stainless steel in terms of cost of material, with nitrogen and manganese Instead of nickel element, stable austenite, saves great amount of cost, in addition, after mixed rare earth of lanthanum and cerium element solid solution is in steel, can improve richness The stability of Cr passivating films, improves corrosion resistance；Rare earth element can also be enriched in crystal boundary, and it is inclined in crystal boundary to reduce impurity element It is poly-, increase grain-boundary strength, improve the resistance to corrosion and mechanical property of crystal boundary.
For alloy of the present invention with nitrogen for nickel, production cost is low, per ton with nickel price by steely iron alloy raw material cost accounting 100000 yuan of calculating, its steel production cost per ton reduce by 12% or so than OCr18Ni12Mo2Ti austenitic stainless steels, and saving takes With about 1200 yuan.Further, since alloy strength of the present invention is high and corrosion resistance is preferable, if so with its substitute 316L and The austenitic stainless steels such as OCr18Ni12Mo2Ti will cause the workpiece service life to increase substantially, thus will bring considerable economy and Social benefit, in addition, alloy of the present invention also have it is good cast, be corrosion-resistant, processability and welding performance, it is sudden and violent available for structure It is exposed under high chloride ion or corrosivity industrial environment and uses steel, using the road and bridge steel plate of deicing salt, ocean enclosure wall or defence Fortification steel, freeway bridge and road surface reinforcing bar etc..
The above, is only further embodiment of the present invention, but protection scope of the present invention is not limited thereto, any In scope disclosed in this invention, technique according to the invention scheme and its design add those familiar with the art With equivalent substitution or change, protection scope of the present invention is belonged to.

Claims (10)

1. a kind of double phase stainless steel alloy of high intensity, it is characterised in that include the constituent of following mass percent：
C≤0.025%；
S≤0.005%；
P≤0.02%；
Si≤2.00%；
Mn：6.00~10.00%；
Cr：30.0~35.0%；
Ni：4.0~6.0%；
Mo：3.0~5.0%；
W：0.2-1.0%；
N：0.3~0.6%；
B：0.01~0.02%；
Mischmetal：0.01~0.1%；
Fe surpluses.
2. the double phase stainless steel alloy of a kind of high intensity according to claim 1, it is characterised in that the mischmetal is Mixed rare earth of lanthanum and cerium.
3. the double phase stainless steel alloy of a kind of high intensity according to claim 2, it is characterised in that the lanthanum cerium mixing is dilute In soil, La≤48%, Ce≤45%.
4. the double phase stainless steel alloy of a kind of high intensity according to claim 3, it is characterised in that the lanthanum cerium mixing is dilute Content summation >=99.7% of La and Ce is gone back in soil.
5. the double phase stainless steel alloy of a kind of high intensity according to claim 4, it is characterised in that the lanthanum cerium mixing is dilute In soil also containing praseodymium, neodymium, promethium, samarium rare earth element one or more.
6. a kind of preparation method of the double phase stainless steel alloy of high intensity as described in claim 1-5 any one, its feature It is, includes the following steps：Smelting, casting, ingot casting or strand cogging, hot rolling and solution treatment.
7. the preparation method of the double phase stainless steel alloy of high intensity according to claim 6, it is characterised in that specifically include Following steps：
Step 1：Smelt
External refining, converter is added to add any technique in external refining to smelt using vaccum sensitive stove, air induced melting, electric furnace；
Step 2：Ingot casting or ingot formation
Ingot casting or strand use hammer cogging or continuous casting and rolling；
Step 3：Hot rolling
Hot rolling is carried out to steel after ingot casting or ingot formation, blank heating temperature is 1150-1250 DEG C during hot rolling, and start rolling temperature is 1150-1200 DEG C, finishing temperature is 950-1050 DEG C；
Step 4：Solution treatment
Solution treatment is carried out after steel hot rolling in heat-treatment furnace, solid solubility temperature is 1050-1150 DEG C, cold after insulation 30-60min But.
8. the preparation method of the double phase stainless steel alloy of a kind of high intensity according to claim 7, it is characterised in that described In step 1, rare earth metal is added before tapping casting is smelted, cast temperature is controlled at 1570-1660 DEG C.
9. the preparation method of the double phase stainless steel alloy of a kind of high intensity according to claim 7, it is characterised in that described In step 2, the heating-up temperature of hammer cogging or continuous casting and rolling is 1150-1300 DEG C, and cogging initial forging temperature is 1150-1300 DEG C, Final forging temperature is 950-1050 DEG C.
A kind of 10. preparation method of the double phase stainless steel alloy of high intensity according to claim 7, it is characterised in that institute State in step 4, the type of cooling uses water cooling or air-cooled.
CN201710978385.2A 2017-10-18 2017-10-18 A kind of double phase stainless steel alloy of high intensity and preparation method thereof Pending CN107904522A (en)

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