CN103667947A - Nickel-free austenitizing stainless steel, manufacturing process thereof, and method for manufacturing flange by nickel-free austenitizing stainless steel - Google Patents
Nickel-free austenitizing stainless steel, manufacturing process thereof, and method for manufacturing flange by nickel-free austenitizing stainless steel Download PDFInfo
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Abstract
The invention discloses nickel-free austenitizing stainless steel, a manufacturing process thereof, and a method for manufacturing a flange by the nickel-free austenitizing stainless steel. The nickel-free austenitizing stainless steel comprises the following chemical components in percentage by weight: 0.10 to 0.20 percent of C, 12.0 to 16.0 percent of Cr, 21.0 to 25.0 percent of Mn, 0.50 to 1.00 percent of Cu, 0.10 to 0.20 percent of N, 1.00 to 2.00 percent of Si, 1.00 to 2.00 percent of Al, less than or equal to 0.035 percent of P, less than or equal to 0.02 percent of S, 0.03 to 0.10 percent of Re and the balance of Fe and impurities which cannot be removed. The manufacturing process of the nickel-free austenitizing stainless steel comprises a dosing process, an electric furnace primary refining process, an argon oxygen decarburization (AOD) furnace refining process, a process for processing molten steel by blowing nitrogen and a continuous casting process. The method for manufacturing the flange comprises the steps of sawing, heating blanks, forging, punching, coining and the like. The heat-resistant nickel-free austenitizing stainless steel is manufactured by elements such as manganese and nitrogen instead of noble metal nickel.
Description
Technical field
The present invention relates to ferrous metallurgy field of new, be particularly related to a kind of without nickel Austriaization body stainless steel and manufacturing process and by the method for its manufacturing flange, with elements such as manganese, nitrogen, replace the heat-resisting without nickel Austriaization body stainless steel of nickel noble metal manufacture specifically, and there is anti-oxidant under 700 ℃～900 ℃ hot conditionss, resistance to deformation, heat resistanceheat resistant crackle, well behaved heat-resisting steel material, can be used for calcium carbide furnace cover, dust-removing heat exchanger pipe fitting, flange and steam turbine internals etc.
Background technology
Along with society grows with each passing day to the stainless demand of Austria's body, people are to having a preference for especially containing Ni Austriaization body stainless steel, but the earth can be limited for manufacturing the stainless nickel resources of Austriaization body, nickel resources belongs to strategic material simultaneously, so each state of our times is all developing joint nickel Austriaization body stainless steel, to meet the needs of social development, object of the present invention, just in order to solve above-mentioned problem, employing replaces nickel metal with elements such as manganese nitrogen, develop successfully without nickel Austriaization body stainless steel, can partly replace special-purpose Cr-Ni Austriaization body stainless steels such as ASTMS304 and S310, thereby fill up domestic without blank of nickel Austriaization body stainless steel, accomplished saving Ni resource, reduced product cost, make product have the market competitiveness.
Summary of the invention
The object of the invention is to overcome the defect existing in prior art, provide a kind of without nickel Austriaization body stainless steel, do not add nickel, with manganese, nitrogen, replace, few chromatize, copper, and add rare earth and aluminum element, make it to improve processing forming, high temperature oxidation resisting, the raising hot strength of steel, and there is certain high-temperature corrosion resistance performance.
For achieving the above object, it is a kind of without nickel Austriaization body stainless steel that technical scheme of the present invention provides, and its chemical composition and weight percent are: C:0.10%～0.20%, Cr:12.0%～16.0%, Mn:21.0%～25.0%, Cu:0.50%～1.00%, N:0.10%～0.20%, Si:1.00%～2.00%, A1:1.00～2.00%, P≤0.035%, S≤0.02%, Re:0.03%～0.10%, surplus is Fe and not removable impurity.
As preferably, its chemical composition and weight percent are: C:0.12%～0.18%, Cr:13.0%～16.0%, Mn:22.0%～24.0%, Cu:0.60%～0.90%, N:0.12%～0.18%, Si:1.20%～1.80%, A1:1.20%～1.80%, P≤0.03%, S≤0.015%, Re:0.04%～0.08%, surplus is Fe and not removable impurity.
The principle that each alloying element of the present invention is definite and foundation are as follows:
Nickel equivalent=%Ni+30 * (C+N)+0.5 * %Mn+0.3 * %Cu(1)
Note: the numeral before each element is equivalent to the multiple that nickel forms Austriaization ability of immigrants for the ability that this element forms Austriaization body.
Without nickel Austriaization body stainless steel corrosion resistance index GI
GI=Cr%+3.6×Ni%+4.7×Mo%+11.5×Cu%；（2）
According to above-mentioned two formula, determine composition and the proportioning of each element in 2Cr15Mn23CuA1NRe steel.
(1) C can improve without nickel Austriaization body stainless steel intensity, but significantly reduces plasticity and toughness and the solidity to corrosion of steel, so determine that c content is 0.10%～0.20% to be advisable.
(2) Mn and N content determines
Mn and N obtain Ao Hua body tissue principal element, can replace Ni completely, but Mn are unfavorable to erosion resistance; Because can improve the solubleness of N in steel adding of Mn element, so being defined as to 21.0%～25.0%, N content, Mn content is defined as 0.10%～0.20% in addition, reasonably.
(3) Cr content determines
Chromium is to have decisive significance to the rustless property of steel and solidity to corrosion, along with the increase without chromium content in nickel Austriaization body stainless steel, anticorrosion stress-resistant, spot corrosion, the raising of the local corrosion abilities such as crevice corrosion has material impact, from without finding out the nickel Austriaization body stainless steel content of resistance to spot corrosion PRE value formula and corrosion resistance index GI formula that Cr content is to without the corrosion proof vital role of nickel Austriaization body stainless steel, so Cr content is defined as to 12.0%～16.0%, necessary, if Cr content is further improved again, in order to obtain stable Austria's body without nickel Austriaization body stainless steel, just need to improve again Ni equivalent, so the cost of steel will significantly improve, in order to meet user's service requirements, the cost that reduces again steel is also necessary.
(4) Cu content determines
Cu is the element that significantly improves the erosion resistance of steel, simultaneously favourable to the cold-forming of steel, thus determine Cu content 0.50%～1.0% for well.
(5) Si and A1 content determines
Si and A1 are all thermotolerance and the anti-oxidant elements that significantly improve steel, and simultaneously Si and A1 exist in steel effect more obvious jointly, thus Si content be defined as 1.00%～2.00%, A1 content be defined as 1.00%～2.00% comparatively reasonable.
(6) Re content determines
In steel, add Re to make the purification membrane of steel fine and close, and with the bonding force grow of matrix, thereby improve the corrosion resistance of steel.Re has the ability of very strong deoxidation, desulfurization, suction hydrogen simultaneously, reduces detrimental impurity in steel; When Re content is greater than 0.02% in steel, mainly form Re
2o
2s compound, makes inclusion balling Denaturation remarkable, when Re content is greater than 0.10%, can make steel Rare Earth Inclusions greatly increase, and worsens the purity of steel, thus Re content is defined as to 0.03%～0.10%, correct.
(7) P and S content determines
P and S are unusual detrimental impurity in steel, so should be more low better.
It is a kind of without the stainless manufacturing process of nickel Austriaization body that technical scheme of the present invention also provides, and described manufacturing process comprises:
S1: proportioning process, selecting slag former and clean block steel scrap and copper scrap is furnace charge, and wherein said slag former is lime and rhombspar, and rhombspar accounts for furnace charge gross weight 2-3%, and lime accounts for furnace charge gross weight 0.3%;
S2: electric furnace is sweetening process just, energising post-heating furnace charge, after whole fusings, liquid steel temperature rises to 1580 ℃～1600 ℃, when basicity of slag is 2.5-3.0, adds manganeseirom, ferrochrome in batches, when liquid steel temperature reaches 1590 ℃～1610 ℃, when basicity is 3.0-3.5, when carbon content is 0.20%, pours AOD stove into and carry out refining;
S3:AOD stove refinery practice: be blown into oxygen, argon gas and nitrogen in AOD stove molten bath, along with the reduction of carbon content in steel, the oxidation of chromium increases, and adds reductor and slag former, and described slag former is lime, fluorite, and smelting cycle is 60min;
S4: molten steel technique is processed in nitrogen flushing, when liquid steel temperature rises to 1610 ℃～1630 ℃, basicity of slag is 3.0～3.5 o'clock, when C content reaches 0.08%～0.10%, stop oxygen blast gas, strengthen nitrogen amount, blow 3-5min, increase nitrogen in steel content and reach 0.10%～0.13%, and when in steel, other chemical composition reaches target value, in ladle, add aluminium, rare earth ferrosilicon, at once tap into ladle, in ladle, after standing 7-8min, cast;
S5: continuous casting process, casting process adopts full guard casting, and continuous casting steel temperature is 1580 ℃～1600 ℃, tundish superheating temperature >=15 ℃, casting speed is 0.5～1.0m/min, cooling water inflow is 0.80L/kg, M-EMS parameter: electric current 900A, frequency 5Hz; Continuously cast bloom diameter is 300～600mm, requires heap cool time to be not less than 24 hours after strand rolls off the production line.
In order to improve reduction effect, as preferably, in S3, ferrosilicon, aluminium, the silicon calcium powder of reductor for successively adding successively.
As preferably, in S3, argon gas consumption is 12m
3/ t, nitrogen consumption are 10m
3/ t, oxygen depletion amount are 26m
3/ t, lime consumption amount are that 50kg/t, fluorite consumption are that 3kg/t, aluminium consumption are that 12kg/t, ferrosilicon consumption are 8kg/t.
For realize quick decarburization under the lower prerequisite of chromium scaling loss, simultaneously for saving argon gas, as preferably, in S3, along with the reduction of carbon content in molten bath, Ar:O2 is than improving gradually.
In order to improve chromic oxide, manganese oxide, silicon oxide, revert back the effect in steel, as preferably, in S3, add after reductor and slag former, in nitrogen blowing and argon gas, molten steel is carried out to strong mixing.
As preferably, in S4, nitrogen consumption is 30m
3/ t.
In addition the present invention also provides a kind of method without nickel Austriaization body stainless steel manufacturing flange, and described method comprises:
(a), sawing: according to length and the diameter of required blank, after selected blank, adopt circular saw bench cold cut blanking;
(b), blank heating: blank is heated, furnace temperature is less than 400 ℃, freely heat up after 1 hour, with 40 ℃～60 ℃ per hour, be warmed up to 950 ℃ of insulations 3 hours, and then be warming up to 1300 ℃ with 120 ℃～140 ℃ per hour, be incubated after 2 hours, drop to 1260 ℃ and be incubated again after 1 hour, come out of the stove and start to forge;
(c), forging, punching, pressure-sizing: the blank after heating is carried out to jumping-up or pulling by hydropress, initial forging temperature is 1200 ℃～1250 ℃, forging ratio >=4～6, final forging temperature is 800 ℃～850 ℃, then carry out punching and pressure-sizing and make forging stock size reach finished product blank regulation geometrical shape, the remaining finish size of blank is 15mm;
(d), thermal treatment: be incubated after blank is heated to 1150 ± 10 ℃, soaking time is pressed blank specified size 1 hour/inch, and after insulation, Putting into water rapidly is cooling;
(e), mechanical workout: be, on 2500mm～8000mm routine or numerical control vertical lathe, blank is carried out to mechanical workout in work range, so that reach final dimension tolerance;
(f), defect detecting test, mechanical property inspection: mechanical workout finished product is carried out to UT (Ultrasonic Testing) inspection; Will check forging ' s block dimension tolerance, mechanical property, meets respective standard requirement simultaneously, judges qualified rear packing warehouse-in.
In order to remove forging stock, may there is white point, as preferably, (c) in, after forging, forging stock is put into burial pit fast, slowly cools to 150 ℃ and goes out hole later, cooling rate is 30-50 ℃/h.
Advantage of the present invention and beneficial effect are: adopt and replace nickel noble metal completely with elements such as manganese, nitrogen, manufactured a kind of without nickel economical austenitic heat-resistance stainless steel, utilize the beneficial effect of various alloying elements in steel, ingeniously rationally determined that various alloying element chemical composition proportionings form; Simultaneously to this steel electric furnace just sweetening process, AOD stove refinery practice, continuous casting process, iron alloy add method and order, and flange ring manufacturing process etc. taked a series of effective technology measures and processing step,
By this steel and general ASTMS304 stainless steel, contrast, yield strength and tensile strength have improved 30%, 700 ℃～900 ℃ Testing Tensile Strength at Elevated Temperatures and have improved 20%, and permeability is better than ASTMS304; Owing to having saved nickel resources, product cost has reduced more than 30%.
Embodiment
Below in conjunction with embodiment, the specific embodiment of the present invention is further described.Following examples are only for technical scheme of the present invention is more clearly described, and can not limit the scope of the invention with this.
Embodiment 1
Existing ASTMS304 and 2Cr15Mn23CuA1NRE of the present invention without nickel Austriaization body stainless steel chemical component to the contrast of mechanical property when in Table 1, table 2.
Table 1 chemical composition Wt%
Note: P:0.02% in steel, S:0.15%
Table 2 mechanical property (thickness 50～100mm)
Note: permeability magneticstrength is 14000 oersteds.
Embodiment 2
Existing ASTMS304 and 2Cr15Mn23CuA1NRE of the present invention without nickel Austriaization body stainless steel chemical component to the contrast of mechanical property when in Table 3, table 4.
Table 3 chemical composition wt%
Note: without P:0.021% in nickel Austriaization body stainless steel, S:0.010%
Table 4 mechanical property (thickness 50～100mm)
Note: permeability magneticstrength is 14000 oersteds.
Embodiment 3
Existing ASTMS304 and 2Cr15Mn23CuA1NRE of the present invention without nickel Austriaization body stainless steel chemical component to the contrast of mechanical property when in Table 5, table 6.
Table 5 chemical composition wt%
Note: without P:0.022% in nickel Austriaization body stainless steel, S:0.010%
Table 6 mechanical property (thickness 50～100mm)
Note: permeability magneticstrength is 14000 oersteds.
Above-mentioned without the stainless manufacturing process of nickel Austriaization body, comprising:
S1: proportioning process, selecting slag former and clean block steel scrap and copper scrap is furnace charge, and wherein said slag former is lime and rhombspar, and rhombspar accounts for furnace charge gross weight 2-3%, and lime accounts for furnace charge gross weight 0.3%;
S2: electric furnace is sweetening process just, energising post-heating furnace charge, after whole fusings, liquid steel temperature rises to 1580 ℃～1600 ℃, when basicity of slag is 2.5-3.0, adds manganeseirom, ferrochrome in batches, when liquid steel temperature reaches 1590 ℃～1610 ℃, when basicity is 3.0-3.5, when carbon content is 0.20%, pours AOD stove into and carry out refining;
S3:AOD stove refinery practice: be blown into oxygen, argon gas and nitrogen in AOD stove molten bath, along with the reduction of carbon content in steel, the oxidation of chromium increases, for realize quick decarburization under the lower prerequisite of chromium scaling loss, simultaneously for saving argon gas, blowing initial stage Ar:O
2lower, in AOD stove, there is the proofing unit that detects carbon content, and detection information can be demonstrated, along with the reduction of carbon content in molten bath, Ar:O
2than improving gradually, then add reductor and slag former, described slag former is lime, fluorite, ferrosilicon, aluminium, the silicon calcium powder of reductor for adding successively, the chromium of oxidation is reverted back in molten steel, and add strong mixing production low-sulfur without nickel Austriaization body stainless steel by blowing argon gas, and reducing wherein S, P content, argon gas consumption is about 12m conventionally
3/ t, nitrogen consumption are about 10m
3/ t, oxygen depletion amount are about 26m
3/ t, lime consumption amount are about 50kg/t, fluorite consumption and are about that 3kg/t, aluminium consumption are about 12kg/t, ferrosilicon consumption is about 8kg/t, smelting cycle is about 60min, the recovery rate approximately 96% of AOD stove chromium, the recovery rate 88% of manganese, total recovery rate of iron approximately 95%;
S4: molten steel technique is processed in nitrogen flushing, and when liquid steel temperature rises to 1610 ℃～1630 ℃, basicity of slag is 3.0～3.5 o'clock, when C content reaches 0.08%～0.10%, stops oxygen blast gas, strengthens nitrogen amount, blows 3-5min, and nitrogen consumption is about 30m
3/ t, increases nitrogen in steel content and reaches 0.10%～0.13%, and when other chemical composition reaches target value in steel, adds aluminium, rare earth ferrosilicon in ladle, at once taps into ladle, in ladle, after standing 7-8min, casts;
S5: continuous casting process, casting process adopts full guard casting, and continuous casting steel temperature is 1580 ℃～1600 ℃, tundish superheating temperature >=15 ℃, casting speed is 0.5～1.0m/min, cooling water inflow is 0.80L/kg, M-EMS parameter: electric current 900A, frequency 5Hz; Continuously cast bloom diameter is 300～600mm, requires heap cool time to be not less than 24 hours after strand rolls off the production line.
Method without nickel Austriaization body stainless steel manufacturing flange comprises:
(a), sawing: according to length and the diameter of required blank, after selected blank, adopt circular saw bench cold cut blanking;
(b), blank heating: blank is heated, furnace temperature is less than 400 ℃, freely heat up after 1 hour, with 40 ℃～60 ℃ per hour, be warmed up to 950 ℃ of insulations 3 hours, and then be warming up to 1300 ℃ with 120 ℃～140 ℃ per hour, be incubated after 2 hours, drop to 1260 ℃ and be incubated again after 1 hour, come out of the stove and start to forge;
(c), forge, punching, pressure-sizing: the blank after heating is carried out to jumping-up or pulling by hydropress, initial forging temperature is 1200 ℃～1250 ℃, forging ratio >=4～6, final forging temperature is 800 ℃～850 ℃, forging object is that steel billet column crystal is smashed, make the refinement of crystalline grain of steel degree, then carrying out punching and pressure-sizing makes forging stock size reach finished product blank regulation geometrical shape, the remaining finish size of blank is 15mm, in order to remove forging stock, may there is white point, after forging, forging stock is put into burial pit fast, slowly cool to 150 ℃ and go out hole later, cooling rate is 30-50 ℃/h,
(d), thermal treatment: be incubated after blank is heated to 1150 ± 10 ℃, soaking time is pressed blank specified size 1 hour/inch, and after insulation, Putting into water rapidly is cooling;
(e), mechanical workout: according to forging blank size, respectively being, on 2500mm～8000mm routine or numerical control vertical lathe, blank is carried out to mechanical workout in work range, so that reach final dimension tolerance;
(f), defect detecting test, mechanical property inspection: mechanical workout finished product is carried out to UT (Ultrasonic Testing) inspection, check crackle, be mingled with, the defect such as shrinkage cavity, pore, white point; Will check forging ' s block dimension tolerance, mechanical property, meets respective standard requirement simultaneously, judges qualified rear packing warehouse-in.
Note: AOD stove is for adopting the refining furnace of AOD purifying method, and AOD purifying method is the abbreviation of argon-oxygen-decarburization process (argon oxygen decarburization).
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. without nickel Austriaization body stainless steel, it is characterized in that, its chemical composition and weight percent are: C:0.10%～0.20%, Cr:12.0%～16.0%, Mn:21.0%～25.0%, Cu:0.50%～1.00%, N:0.10%～0.20%, Si:1.00%～2.00%, A1:1.00～2.00%, P≤0.035%, S≤0.02%, Re:0.03%～0.10%, surplus is Fe and not removable impurity.
2. as claimed in claim 1ly without nickel Austriaization body stainless steel, it is characterized in that, its chemical composition and weight percent are: C:0.12%～0.18%, Cr:13.0%～16.0%, Mn:22.0%～24.0%, Cu:0.60%～0.90%, N:0.12%～0.18%, Si:1.20%～1.80%, A1:1.20%～1.80%, P≤0.03%, S≤0.015%, Re:0.04%～0.08%, surplus is Fe and not removable impurity.
3. as claimed in claim 1 or 2 without the stainless manufacturing process of nickel Austriaization body, it is characterized in that: described manufacturing process comprises:
S1: proportioning process, selecting slag former and clean block steel scrap and copper scrap is furnace charge, and wherein said slag former is lime and rhombspar, and rhombspar accounts for furnace charge gross weight 2-3%, and lime accounts for furnace charge gross weight 0.3%;
S2: electric furnace is sweetening process just, energising post-heating furnace charge, after whole fusings, liquid steel temperature rises to 1580 ℃～1600 ℃, when basicity of slag is 2.5-3.0, adds manganeseirom, ferrochrome in batches, when liquid steel temperature reaches 1590 ℃～1610 ℃, when basicity is 3.0-3.5, when carbon content is 0.20%, pours AOD stove into and carry out refining;
S3:AOD stove refinery practice: be blown into oxygen, argon gas and nitrogen in AOD stove molten bath, along with the reduction of carbon content in steel, the oxidation of chromium increases, and adds reductor and slag former, and described slag former is lime, fluorite, and smelting cycle is 60min;
S4: molten steel technique is processed in nitrogen flushing, when liquid steel temperature rises to 1610 ℃～1630 ℃, basicity of slag is 3.0～3.5 o'clock, when C content reaches 0.08%～0.10%, stop oxygen blast gas, strengthen nitrogen amount, blow 3-5min, increase nitrogen in steel content and reach 0.10%～0.13%, and when in steel, other chemical composition reaches target value, in ladle, add aluminium, rare earth ferrosilicon, at once tap into ladle, in ladle, after standing 7-8min, cast;
S5: continuous casting process, casting process adopts full guard casting, and continuous casting steel temperature is 1580 ℃～1600 ℃, tundish superheating temperature >=15 ℃, casting speed is 0.5～1.0m/min, cooling water inflow is 0.80L/kg, M-EMS parameter: electric current 900A, frequency 5Hz; Continuously cast bloom diameter is 300～600mm, requires heap cool time to be not less than 24 hours after strand rolls off the production line.
4. as claimed in claim 3 without the stainless manufacturing process of nickel Austriaization body, it is characterized in that: in S3, ferrosilicon, aluminium, the silicon calcium powder of reductor for successively adding successively.
5. as claimed in claim 4 without the stainless manufacturing process of nickel Austriaization body, it is characterized in that: in S3, argon gas consumption is 12m
3/ t, nitrogen consumption are 10m
3/ t, oxygen depletion amount are 26 m
3/ t, lime consumption amount are that 50kg/t, fluorite consumption are that 3kg/t, aluminium consumption are that 12kg/t, ferrosilicon consumption are 8kg/t.
6. as claimed in claim 3 without the stainless manufacturing process of nickel Austriaization body, it is characterized in that: in S3, along with the reduction of carbon content in molten bath, Ar:O
2than improving gradually.
7. as claimed in claim 3 without the stainless manufacturing process of nickel Austriaization body, it is characterized in that: in S3, add after reductor and slag former, in nitrogen blowing and argon gas, molten steel is carried out to strong mixing.
8. as claimed in claim 3 without the stainless manufacturing process of nickel Austriaization body, it is characterized in that: in S4, nitrogen consumption is 30m
3/ t.
9. the method without nickel Austriaization body stainless steel manufacturing flange as claimed in claim 1 or 2, is characterized in that, described method comprises:
(a), sawing: according to length and the diameter of required blank, after selected blank, adopt circular saw bench cold cut blanking;
(b), blank heating: blank is heated, furnace temperature is less than 400 ℃, freely heat up after 1 hour, with 40 ℃～60 ℃ per hour, be warmed up to 950 ℃ of insulations 3 hours, and then be warming up to 1300 ℃ with 120 ℃～140 ℃ per hour, be incubated after 2 hours, drop to 1260 ℃ and be incubated again after 1 hour, come out of the stove and start to forge;
(c), forging, punching, pressure-sizing: the blank after heating is carried out to jumping-up or pulling by hydropress, initial forging temperature is 1200 ℃～1250 ℃, forging ratio >=4～6, final forging temperature is 800 ℃～850 ℃, then carry out punching and pressure-sizing and make forging stock size reach finished product blank regulation geometrical shape, the remaining finish size of blank is 15mm;
(d), thermal treatment: be incubated after blank is heated to 1150 ± 10 ℃, soaking time is pressed blank specified size 1 hour/inch, and after insulation, Putting into water rapidly is cooling;
(e), mechanical workout: be, on 2500mm～8000mm routine or numerical control vertical lathe, blank is carried out to mechanical workout in work range, so that reach final dimension tolerance;
(f), defect detecting test, mechanical property inspection: mechanical workout finished product is carried out to UT (Ultrasonic Testing) inspection; Will check forging ' s block dimension tolerance, mechanical property, meets respective standard requirement simultaneously, judges qualified rear packing warehouse-in.
10. the method without nickel Austriaization body stainless steel manufacturing flange as claimed in claim 9, is characterized in that, (c) in, after forging, forging stock is put into burial pit fast, slowly cools to 150 ℃ and goes out hole later, cooling rate is 30-50 ℃/h.
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| CN105964872A (en) * | 2016-07-19 | 2016-09-28 | 苏州誉衡昌精密机械有限公司 | Forging technology for circular ring products |
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| CN111433381B (en) * | 2017-12-07 | 2021-09-03 | 杰富意钢铁株式会社 | High Mn steel and method for producing same |
| WO2019124689A1 (en) * | 2017-12-20 | 2019-06-27 | 주식회사 포스코 | Non-magnetic austenitic stainless steel having improved strength and surface conductivity |
| CN111492081A (en) * | 2017-12-20 | 2020-08-04 | 株式会社Posco | Non-magnetic austenitic stainless steel with improved strength and surface conductivity |
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| CN108504962A (en) * | 2018-06-28 | 2018-09-07 | 江阴市恒润重工股份有限公司 | For the sea water desalting equipment manufacturing process of high-performance diphase stainless steel flange |
| CN108754347A (en) * | 2018-06-28 | 2018-11-06 | 江阴市恒润重工股份有限公司 | The manufacturing process of petrochemical equipment Anti-corrosion flange |
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Effective date of registration: 20160823 Address after: 214400 Jiangsu city of Wuxi province Jiangyin City Zhutang Town Industrial Zone on the south side of Zhu Huang Lu Patentee after: Jiangyin Hengrun Ring Forging Co., Ltd. Address before: 214423 A zone, European Industrial Park, Zhouzhuang Town, Wuxi, Jiangsu, Jiangyin Patentee before: JIANGYIN HENGRUN HEAVY INDUSTRY CO., LTD. |