CN116623106A - High weather-resistant steel plate for 355 Mpa-level shock insulation support and manufacturing method thereof - Google Patents
High weather-resistant steel plate for 355 Mpa-level shock insulation support and manufacturing method thereof Download PDFInfo
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- CN116623106A CN116623106A CN202310549012.9A CN202310549012A CN116623106A CN 116623106 A CN116623106 A CN 116623106A CN 202310549012 A CN202310549012 A CN 202310549012A CN 116623106 A CN116623106 A CN 116623106A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 64
- 239000010959 steel Substances 0.000 title claims abstract description 64
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 230000035939 shock Effects 0.000 title claims abstract description 12
- 238000009413 insulation Methods 0.000 title claims abstract description 11
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 238000005098 hot rolling Methods 0.000 claims abstract description 4
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 238000005096 rolling process Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims 8
- 230000007797 corrosion Effects 0.000 abstract description 13
- 238000005260 corrosion Methods 0.000 abstract description 13
- 238000002360 preparation method Methods 0.000 abstract description 7
- 229910052698 phosphorus Inorganic materials 0.000 description 9
- 239000011574 phosphorus Substances 0.000 description 8
- 229910000870 Weathering steel Inorganic materials 0.000 description 7
- 239000011651 chromium Substances 0.000 description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- 229910001563 bainite Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 102000020897 Formins Human genes 0.000 description 1
- 108091022623 Formins Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
Classifications
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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
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
-
- 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
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- 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
- C21D2211/002—Bainite
-
- 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
-
- 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
- C21D2211/009—Pearlite
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a high weather-resistant steel plate for 355 Mpa-level shock insulation supports, which comprises the following components in percentage by weight of 0.08% -0.12% of C, 0.3% -0.45% of Si, 0.7% -0.9% of Mn, 0.07% -0.11% of P, 0.015% of S, 0.015% -0.025% of Nb, 0.006% -0.016% of Ti, 0.45% -0.60% of Cr, 0.08% -0.2% of Ni, 0.25% -0.35% of Cu, 0.02% -0.05% of Al, and the balance of Fe and unavoidable impurities; the method for manufacturing the steel plate mainly comprises a heating process, a hot rolling process and a cooling process. The steel plate has the advantages of simple preparation process, low cost, good anti-seismic and corrosion resistance, good low-temperature impact toughness and good plate shape control.
Description
Technical Field
The invention relates to a high weather-resistant steel plate and a manufacturing method thereof, in particular to a 355 Mpa-level high weather-resistant steel plate for a shock insulation support and a manufacturing method thereof.
Background
With the rapid development of modern industry, the application field of steel is increasingly wide, so that higher requirements are also put forward on the anti-seismic and corrosion-resistant properties of the steel, and the development of weather-resistant steel with excellent anti-seismic, high corrosion-resistant and comprehensive mechanical properties becomes an important direction for future development.
Since the main corrosion resistant elements Ni and Cr are in shortage in resources at present, and the P element in the weathering steel is an economic and effective corrosion resistant element, the weathering steel taking Cu+high P as the main corrosion resistant element is an important direction of research in the field.
The steel plate thickness specification of Q355GNHG in national standard GB/T4171-2008 is limited to be less than or equal to 20mm. At present, high-phosphorus high-weather-resistance Q355GNH is researched to be more steel plates or steel belts with the thickness less than or equal to 20mm, and the steel plates with the thickness more than 20mm are more difficult to produce than the steel plates with the thickness less than or equal to 20mm, but the required thickness of the steel plates in the market is far higher than the national standard upper limit, so that the 355 Mpa-level steel plates with the thickness more than 20mm, simple production process, low cost, good anti-seismic and corrosion resistance and low-temperature impact toughness are developed, and the 355 Mpa-level steel plates have important value and significance.
The invention patent CN201811272684.5 discloses 345 MPa-level low-yield-ratio weather-resistant steel and a preparation method thereof, and the invention patent CN201711287407.7 discloses 460 MPa-level high-strength high-weather-resistant steel plate and a production method thereof, and the invention discloses phosphorus-containing high-weather-resistant steel which is a steel plate product but has a thickness less than or equal to 20mm.
The invention patent CN202010745266.4 discloses a 450 MPa-level high-silicon high-phosphorus weathering steel and a preparation method thereof, the invention patent CN202010743939.2 discloses a 380 MPa-level high-phosphorus weathering steel and a preparation method thereof, the invention patent CN201610698630.X discloses a preparation method of a high-phosphorus weathering steel cast-rolled thin strip, the invention patent CN202010743955.1 discloses a 510 MPa-level high-silicon high-phosphorus high-chromium weathering steel and a preparation method thereof, and the invention discloses a phosphorus-containing high-weathering steel but steel coil and a thin specification product.
The invention patent CN201811493051.7 discloses an atmosphere corrosion resistant super-thick plate Q355GNH steel plate and a production method thereof, and is characterized in that the thickness of the steel plate is 120mm, the carbon equivalent Ceq is less than or equal to 0.39, the welding crack sensitivity index Pcm is less than or equal to 0.20, and the steel plate has good low welding crack sensitivity and atmosphere corrosion resistance, but the method has the defects that the cost is higher due to the addition of a plurality of noble alloy elements such as Mo, V and the like, and meanwhile, the tempering process is also adopted, the process is complex, and the production period is long.
The invention patent CN202110652704.7 discloses an economic high weather-proof medium-thickness Q355GNH steel plate and a production method thereof, and is characterized in that a low-carbon design thought is adopted, P, cu, cr, ni is added, and a two-stage controlled rolling and controlled cold rolling process is adopted, so that stable production of the Q355GNH steel plate with simple process, low cost and medium thickness specification is realized. The thickness of the invention is more than 20mm, lower yield ratio can not be realized, and the invention also has good low-temperature impact toughness.
Disclosure of Invention
The invention aims to: the invention aims to provide a 355 Mpa-level high weather-resistant steel plate for a shock-insulating support, which has good shock resistance and corrosion resistance and low-temperature impact toughness; another object of the present invention is to provide a method for manufacturing the weather-resistant steel sheet.
The technical scheme is as follows: the high weather resistant steel plate for 355 Mpa-level shock insulation support comprises the following components in percentage by weight: 0.08% or less of C or less than 0.12%, 0.3% or less of Si or less than 0.45%, 0.7% or less of Mn or less than 0.9%, 0.07% or less of P or less than 0.11%, 0.015% or less of S, 0.015% or less of Nb or less of 0.025%, 0.006% or less of Ti or less of 0.016%, 0.45% or less of Cr or less of 0.60%, 0.08% or less of Ni or less of 0.2%, 0.25% or less of Cu or less of 0.35%, 0.02% or less of AL or less of 0.05%, and the balance of Fe and unavoidable impurities.
The anti-seismic high weather-resistant steel plate adopts a high P component design, can greatly improve the atmospheric corrosion resistance of steel when being combined with other alloy elements, particularly Cu, but easily has low-temperature brittleness when the phosphorus content is higher, worsens the low-temperature impact toughness, and improves the low-temperature toughness by adding micro alloy elements (Nb and Ti) to refine grains.
Further, the 355 Mpa-level high weather resistant steel plate for the shock insulation support has the thickness of 20-60 mm and R p0.2 ≥355Mpa，R p0.2 /R m ≤0.80，K v2 The temperature of minus 40 ℃ is more than or equal to 47J, and meanwhile, the invention has lower yield ratio of less than or equal to 0.80, can absorb energy during earthquake, plays a role of buffering, and avoids brittle failure.
Further, the grain size of the steel sheet is 10 to 20 μm.
The invention relates to a manufacturing method of high weather resistant steel for 355 Mpa-level shock insulation support, which comprises the following steps: (1) a heating step, (2) a hot rolling step, and (3) a cooling step.
Further, in the step (1), the billet is heated by a heating furnace, the temperature of a heating section is controlled to be 1200+/-20 ℃, and the total furnace time is (0.9-1.5) H (H-steel plate thickness) min.
Further, in the step (2), two-stage controlled rolling is adopted, and after the steel plate comes out of the heating furnace, two-stage controlled rolling is adopted, and the temperature of finish rolling is ensured to be controlled at 800-880 ℃ when the thickness of a warm blank is not less than 2.2H (H-steel plate thickness).
Further, in the step (3), water cooling or air cooling is adopted to the room temperature, and the reddening temperature is 680-720 ℃.
According to the invention, through the composition design of high P, a certain amount of alloying elements such as Cr, ni and Cu are added to improve the atmospheric corrosion resistance of steel, meanwhile, micro alloying elements such as Nb and Ti are added to strengthen precipitation of steel, the thickness of the steel plate is 20-60 mm, a two-stage controlled rolling process is adopted to roll the steel plate, then watering and cooling or air cooling are carried out, the stacking and slow cooling process is omitted, the cooling time is shortened, and the process is simpler without heat treatment. Yield strength R p0.2 Not less than 355Mpa, matrixThe structure is massive ferrite, pearlite and a small amount of bainite.
The beneficial effects are that: compared with the prior art, the invention has the following remarkable advantages: the 355 Mpa-grade high weather-resistant steel plate for the shock-proof support has the advantages of simple preparation process, low cost, good shock resistance, corrosion resistance, low-temperature impact toughness, good plate shape control, thickness specification of 20-60 mm and R p0.2 ≥355Mpa，R p0.2 /R m ≤0.80，K v2 (-40℃)≥47J。
Drawings
FIG. 1 is a diagram showing a metallographic structure of a 46mm thick steel plate of example 3 at 1/4.
Detailed Description
The technical scheme of the invention is further described below with reference to specific examples.
Examples 1 to 5
The components and weight percentages of the high weather resistant steel for the 355 Mpa-level shock insulation support are shown in table 1, and the balance is Fe and unavoidable impurities.
TABLE 1 chemical composition%
| Examples | C(％) | Mn(％) | P(％) | S(％) | Si(％) | Ni(％) | Cr(％) |
| Example 1 | 0.080 | 0.740 | 0.0725 | 0.0106 | 0.355 | 0.098 | 0.461 |
| Example 2 | 0.091 | 0.741 | 0.078 | 0.0085 | 0.331 | 0.09 | 0.465 |
| Example 3 | 0.095 | 0.755 | 0.0845 | 0.0082 | 0.378 | 0.106 | 0.466 |
| Example 4 | 0.090 | 0.750 | 0.0776 | 0.0054 | 0.367 | 0.098 | 0.469 |
| Example 5 | 0.091 | 0.755 | 0.075 | 0.0065 | 0.38 | 0.11 | 0.46 |
| Examples | Cu(％) | Alt(％) | Nb(％) | Ti(％) | Ceq | - | - |
| Example 1 | 0.256 | 0.032 | 0.0173 | 0.016 | 0.321 | - | - |
| Example 2 | 0.302 | 0.056 | 0.017 | 0.016 | 0.334 | - | - |
| Example 3 | 0.263 | 0.038 | 0.0173 | 0.0127 | 0.340 | - | - |
| Example 4 | 0.262 | 0.035 | 0.0171 | 0.0125 | 0.335 | - | - |
| Example 5 | 0.271 | 0.036 | 0.018 | 0.0126 | 0.332 |
The manufacturing method comprises the following steps:
(1) Heating procedure: heating the steel billet by adopting a heating furnace, controlling the temperature of a heating section to be 1200+/-20 ℃, and controlling the total furnace time (0.9-1.5) H (H-steel plate thickness mm) for min;
(2) Hot rolling: after a continuous casting billet is heated and discharged from a furnace before rolling, rolling is controlled by adopting two stages, and the rolling temperature in the finish rolling stage is controlled to be 800-880 ℃ when the thickness of a warm billet is not less than 2.2H (H-steel plate thickness);
(3) And (3) a cooling procedure: water cooling or air cooling is adopted to the room temperature, and the redback temperature is 680-720 ℃.
Examples 1-5 specific rolling process parameters are shown in table 2.
Table 2 examples 1 to 5 rolling process parameters
The properties of the products obtained in examples 1 to 5 are shown in Table 3.
TABLE 3 Properties of the products obtained in examples 1 to 5
According to the performance results, the steel plate prepared by the method has lower yield ratio and good low-temperature toughness. The high weather-resistant steel plate for the shock-insulation rubber support, which can be prepared by the method, has wide application range and good market prospect.
The morphology of the metallographic structure at 1/4 part of the steel plate obtained in the example 3 is shown in figure 1, and is mainly ferrite, pearlite and a small amount of bainite, and the grain size is about 10-20 mu m.
Claims (10)
1. A355 Mpa-level high weather resistant steel plate for a shock insulation support is characterized by comprising the following components in percentage by weight: 0.08% or less of C or less than 0.12%, 0.3% or less of Si or less than 0.45%, 0.7% or less of Mn or less than 0.9%, 0.07% or less of P or less than 0.11%, 0.015% or less of S, 0.015% or less of Nb or less of 0.025%, 0.006% or less of Ti or less of 0.016%, 0.45% or less of Cr or less of 0.60%, 0.08% or less of Ni or less of 0.2%, 0.25% or less of Cu or less of 0.35%, 0.02% or less of Al or less of 0.05%, and the balance of Fe and unavoidable impurities.
2. The high weather resistant steel plate for 355 Mpa-level vibration isolation mounts according to claim 1, wherein the thickness thereof is 20 to 60mm.
3. The high weather resistant steel plate for 355 Mpa-level vibration isolation mount according to claim 1, wherein R p0.2 ≥355Mpa，R m :490～630Mpa，R p0.2 /R m ≤0.80，K v2 (-40℃)≥47J。
4. The 355 Mpa-level vibration isolation bearing high weather resistant steel plate according to claim 1, wherein the grain size of the steel plate is 10 to 20 μm.
5. A method for manufacturing a high weather resistant steel plate for 355 Mpa-level shock insulation support according to any one of claims 1 to 4, comprising the steps of: (1) a heating step, (2) a hot rolling step, and (3) a cooling step.
6. The method for producing a high weather resistant steel sheet for 355Mpa level vibration isolation mounts of claim 5, wherein in step (1), the billet heating temperature is 1180 ℃ to 1220 ℃.
7. The method for producing a high weather resistant steel plate for 355Mpa level vibration isolation bearing of claim 5, wherein in step (2), two-stage controlled rolling is adopted, and the thickness of the green sheet is equal to or more than 2.2h, and h is the thickness of the steel plate.
8. The method for producing a high weather resistant steel sheet for 355Mpa level vibration isolation mounts according to claim 5, wherein in step (2), the rolling temperature in the finish rolling stage is controlled to 800 ℃ to 880 ℃.
9. The method for producing a high weather resistant steel sheet for 355Mpa level vibration isolation mounts of claim 5, wherein in step (3), water cooling or air cooling is employed to room temperature in the cooling step.
10. The method for producing a high weather resistant steel sheet for 355Mpa level vibration isolation mounts of claim 5 wherein in step (3), the redback temperature in said cooling step is 680 to 720 ℃.
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| CN101487105A (en) * | 2009-02-27 | 2009-07-22 | 东北大学 | Surface inverse segregation phosphor high phosphor weather resistant steel castings thin belt and manufacture method thereof |
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| CN109234635A (en) * | 2018-10-29 | 2019-01-18 | 南京钢铁股份有限公司 | A kind of 345MPa grades of low yield ratio weathering resistant steel and preparation method thereof |
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