CN116926435A - Free-cutting low-expansion alloy and production method thereof - Google Patents
Free-cutting low-expansion alloy and production method thereof Download PDFInfo
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- CN116926435A CN116926435A CN202310673512.3A CN202310673512A CN116926435A CN 116926435 A CN116926435 A CN 116926435A CN 202310673512 A CN202310673512 A CN 202310673512A CN 116926435 A CN116926435 A CN 116926435A
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- 238000005520 cutting process Methods 0.000 title claims abstract description 44
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 29
- 239000000956 alloy Substances 0.000 title claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 title abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 28
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 17
- 239000011572 manganese Substances 0.000 claims abstract description 17
- 239000010959 steel Substances 0.000 claims abstract description 17
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 16
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000005096 rolling process Methods 0.000 claims abstract description 14
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 14
- 239000011593 sulfur Substances 0.000 claims abstract description 14
- 229910017052 cobalt Inorganic materials 0.000 claims abstract description 10
- 239000010941 cobalt Substances 0.000 claims abstract description 10
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000009749 continuous casting Methods 0.000 claims abstract description 10
- 238000004512 die casting Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000007670 refining Methods 0.000 claims abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 10
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 9
- 238000003723 Smelting Methods 0.000 claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 9
- CADICXFYUNYKGD-UHFFFAOYSA-N sulfanylidenemanganese Chemical compound [Mn]=S CADICXFYUNYKGD-UHFFFAOYSA-N 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims description 7
- 239000011574 phosphorus Substances 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 3
- 238000005275 alloying Methods 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 3
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000001953 recrystallisation Methods 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 10
- 229920000049 Carbon (fiber) Polymers 0.000 abstract description 6
- 239000004917 carbon fiber Substances 0.000 abstract description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 5
- 239000002131 composite material Substances 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 238000009826 distribution Methods 0.000 abstract description 2
- 239000006185 dispersion Substances 0.000 abstract 1
- 150000003568 thioethers Chemical class 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 8
- 238000005336 cracking Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 229910000915 Free machining steel Inorganic materials 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000002173 cutting fluid Substances 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 150000004763 sulfides Chemical class 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/001—Heat treatment of ferrous alloys containing Ni
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
-
- 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
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- 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
- C22C38/10—Ferrous alloys, e.g. steel alloys containing cobalt
- C22C38/105—Ferrous alloys, e.g. steel alloys containing cobalt containing Co and Ni
-
- 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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials 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 free-cutting low-expansion alloy and a production method thereof, which aim to solve the defects of high viscosity and poor processability of the existing low-expansion alloy 4J36 material. The technical scheme is that the free-cutting low-expansion alloy comprises the following chemical components in which the sum of nickel and cobalt is34.0 to 37.0 percent, and the manganese to sulfur ratio is 6 to 15; the production method comprises the following steps: intermediate frequency furnace smelting, LF furnace refining, continuous casting/die casting cogging, heating by a heating furnace and rolling; (1) By adding magnetic element cobalt, the expansion coefficient in the temperature range of room temperature to 100 ℃ is controlled to be less than 1.5x10 ‑6 The method comprises the steps of carrying out a first treatment on the surface of the (2) The free-cutting elements of sulfur and manganese are added to lead the steel to form dispersion distribution and beneficial spindle-shaped sulfides by the addition of 6 to 15 percent of sulfur. The beneficial effects of the invention are as follows: on the premise of ensuring the low linear expansion coefficient of the low-expansion alloy, the cutting performance of the alloy is obviously improved, the cuttings are efficiently cleaned, and the good matching of the cutting performance and the expansion performance of the low-expansion alloy for the carbon fiber composite material die is satisfied.
Description
Technical Field
The invention relates to the technical field of free-cutting alloys, in particular to a free-cutting low-expansion alloy and a production method thereof.
Background
Carbon fiber materials are widely used in the fields of aerospace, automobiles, decoration and the like as engineering materials with highest specific strength, and the demand is rapidly increased. The forming die is a key tool for manufacturing the carbon fiber component. The precision of the carbon fiber component is directly determined by the precision and expansion coefficient of the forming die, in order to ensure the precision requirement, a low expansion alloy 4J36 with the expansion coefficient identical to that of the carbon fiber component is generally adopted as a die material, and the expansion coefficient of the alloy is smaller than 1.5x10 according to the YB/T5241 standard requirement -6 and/C. Because the nickel content of the low-expansion alloy 4J36 is about 36%, the material has high viscosity and poor processing performance, and an ultra-fine polishing method is needed to achieve higher processing precision, but the method has long production period and high cost. If high-precision turning is adopted, the machining efficiency can be greatly improved, and the die cost is reduced, but the material viscosity is small, and the machining performance is high.
Disclosure of Invention
The invention discloses a free-cutting low-expansion alloy and a production method thereof, which aim to overcome the defects of high viscosity and poor processability of the existing low-expansion alloy 4J36 material and obviously improve the cutting performance of the low-expansion alloy on the premise of ensuring a lower linear expansion coefficient. In order to achieve the above purpose, the following technical scheme is adopted.
Free-cutting low expansion alloy chemical composition (weight percent): carbon: less than 0.08, manganese: 0.30 to 1.00, phosphorus: 0.01 to 0.10 percent, sulfur: 0.020 to 0.100, nickel: 33.5 to 35.5, cobalt: 0.3 to 1.5; wherein the sum of nickel and cobalt is 34.0-37.0, the ratio of manganese to sulfur is 6-15, and the balance is iron and unavoidable impurities.
The production method of the free-cutting low-expansion alloy comprises the following steps: intermediate frequency furnace smelting, LF furnace refining, continuous casting/die casting cogging, heating by a heating furnace and rolling;
the method comprises the following specific steps:
smelting in an intermediate frequency furnace: batching according to chemical components of the finished product, wherein the grain size of the raw materials is smaller than 100mm; melting raw materials by using an intermediate frequency furnace, and tapping after dissolving;
and (3) LF refining: adding ferromanganese after slag formation of molten steel, adjusting the manganese content to be within the range of 0.30% -1.00%, simultaneously meeting the manganese-sulfur ratio of 6-15, blowing argon to ensure that molten steel does not roll, and controlling alloying refining time to be 30-32 min;
continuous casting/die casting cogging: preparing a blank by adopting a continuous casting or die casting cogging mode;
heating by a heating furnace: heating the casting blank at 1200-1250 ℃ for 3-6 h, and then carrying out surface temperature raising heating: heating at 1230-1280 deg.c for 10-30 min;
and (5) rolling: adopting a recrystallization zone for rolling, and adopting the first 3 passes of anhydrous rolling to form a wire rod and bar straight strip product.
The invention is characterized in that:
the method comprises the following steps of:
carbon: carbon is the most basic element of steel materials, and in the present invention, carbon element is an unavoidable impurity element which cannot be removed, and exceeding 0.08% causes an increase in expansion coefficient, so that the carbon content is required to be less than 0.08%.
Manganese: manganese is an important constituent element of MnS inclusions in the invention, which is beneficial to improving the free cutting performance; when the manganese content is lower than 0.30%, the manganese sulfide is poorer in quantity and morphology; when the manganese content is higher than 1.00%, the expansion coefficient of the alloy is too high, and the expansion performance is destroyed, so that the manganese content is controlled within the range of 0.30-1.00%.
Phosphorus: the proper phosphorus can improve the free cutting performance, and if the phosphorus content is higher than 0.10%, cold shortness is generated, and the cutting performance is reduced, so that the phosphorus content is controlled to be 0.01% -0.10%.
Sulfur: sulfur is an effective free-cutting element, and can form manganese sulfide with manganese to change the morphology and distribution of inclusions; when the sulfur content is less than 0.02%, the above effect is not achieved; when the sulfur content exceeds 0.10%, the sulfur will be biased at grain boundaries to cause high-temperature brittleness, so that the sulfur content is controlled within the range of 0.02% -0.10%, and the manganese-sulfur ratio (Mn/S) is controlled to be 6-15.
Cobalt, nickel: converting the iron lattice into an austenite lattice, generating a magnetic lattice with a lattice constant of 3.54 angstroms and a free energy difference of 3.64 angstroms of 0.030 eV-0.040 eV, and continuously changing the phase of the two lattices within a temperature range of 0-100 ℃ to counteract the thermal expansion effect; nickel in the range of 33.5% to 35.5% and cobalt in the range of 0.3% to 1.5%, above or below this composition range will result in a free energy difference exceeding 0.030eV to 0.040eV, resulting in an expansion coefficient exceeding 1.5X10 -6 /℃。
(2) In the production method, the casting blank is heated for 3 to 6 hours at 1200 to 1250 ℃ and is subjected to surface temperature raising and heating: heating at 1230-1280 deg.c for 10-30 min, and raising the surface temperature to raise the toughness of the billet surface area and reduce the surface and end cracking risk of the billet.
The beneficial effects of the invention are as follows:
(1) By adding magnetic element cobalt, the energy difference of the high and low spin states of iron atoms is controlled, and the expansion coefficient in the temperature range of room temperature to 100 ℃ is controlled to be less than 1.5x10 -6 ；
(2) The free-cutting elemental sulfur is added to ensure a certain manganese-sulfur ratio of 6-15, so that dispersed and beneficial spindle-shaped sulfides are formed in the steel, chips are easy to remove in cutting processing, the cutting performance is obviously improved, and the ratio of C-shaped chips is not less than 85% under the cutting working conditions that the cutting performance index is f= (0.06-0.09) mm/r and the rotating speed is (600-800) r/min;
according to the method, after the casting blank is heated, the surface of the casting blank is heated by heating, so that the problem of cracking of the end part of the steel rolled blank and the surface cracking is solved.
In a word, on the premise of ensuring the low linear expansion coefficient of the low-expansion alloy, the cutting performance of the alloy is obviously improved, the cuttings are efficiently cleaned, and the good matching of the cutting performance and the expansion performance of the low-expansion alloy for the carbon fiber composite material die is satisfied.
Detailed Description
The free-cutting low expansion alloy described in this example comprises the following chemical components in weight percent: carbon: 0.01 to 0.08, manganese: 0.30 to 1.00, phosphorus: 0.01 to 0.10 percent, sulfur: 0.020 to 0.100, nickel: 33.5 to 35.5, cobalt: 0.3 to 1.5; the manganese-sulfur ratio is 6-15, and the balance is iron and unavoidable impurities.
The method for producing the free-cutting low-expansion alloy in the embodiment comprises the following steps: intermediate frequency furnace smelting, LF furnace refining, continuous casting/die casting cogging, heating by a heating furnace, and rolling to form a wire rod and bar straight bar product;
the method comprises the following specific steps:
smelting in an intermediate frequency furnace: batching according to chemical components of the finished product, wherein the grain size of the raw materials is smaller than 100mm; melting raw materials by using an intermediate frequency furnace, and tapping after dissolving;
and (3) LF refining: adding ferromanganese after slag formation of molten steel, adjusting the manganese content to be within the range of 0.30% -1.00%, simultaneously meeting the manganese-sulfur ratio of 6-15, blowing argon to ensure that molten steel does not roll, and controlling alloying refining time to be 30-32 min;
continuous casting/die casting cogging: preparing a blank by adopting a continuous casting or die casting cogging mode;
heating by a heating furnace: heating the casting blank at 1200-1250 ℃ for 3-6 h, and then carrying out surface temperature raising heating: heating at 1230-1280 deg.c for 10-30 min;
and (5) rolling: adopting a recrystallization zone for rolling, and adopting the first 3 passes of anhydrous rolling to form a wire rod and bar straight strip product.
Example 1
The chemical compositions of example 1 and comparative examples 1, 2, 3 and the surface temperature raising process using a heating furnace are shown in table 1.
TABLE 1
The steel rolled blanks of the example 1 and the comparative examples 1, 2 and 3 are cracked at the ends and the surfaces, and the relative cutting coefficients Kr, the types of chips and the test steels are shown in Table 2.
TABLE 2
Evaluation of hot rolling stability of cast slab, for example 1 and comparative example 1 (see table 1) of the same chemical composition, since surface heating was performed in example 1 and surface heating was not performed in comparative example 1, the end portion of the slab was not cracked, the surface was not cracked in example 1, and the end portion of the slab was cracked, the surface was cracked in comparative example 1 (see table 2); for example 1 and comparative examples 2 and 3 (see table 1) with different chemical compositions, the ends of the billets were not cracked, the surfaces were not cracked (see table 2), the test steels of example 1 did not exhibit end cracking and surface cracking phenomena, and the continuity and stability of the rolling process were good.
The expansion performance of the rolled material is evaluated, and the expansion coefficient of the example 1 is mainly counted, wherein the expansion coefficient of the test steel corresponding to the example 1 is 1.0 (see table 2), and the linear expansion coefficient requirement of the low expansion alloy standard YB/T5241 is met.
For cutting performance evaluation, cutting tests are carried out on the steel of the example 1 and the steels of the comparative examples 1, 2 and 3 respectively by adopting a 5085 numerical control lathe, and the feed amount and the cutting depth are controlled to be unchanged, but only the cutting rate is changed; the test sample size is phi 20mm multiplied by 250mm, the test tool is an uncoated hard alloy blade, the cutting is carried out under the condition of not using cutting fluid, and the selected feeding amount f=0.3 mm/r-0.5 mm/r and the cutting depth ap=0.5 mm-1.6 mm; the cutting rate is selected from v=300 r/min to 600 r/min; the tool post-wear widths VB at different cutting times T were measured to determine corresponding V60 values (i.e., the allowable cutting speed when the tool durability T was set to 60mi n), and then the relative cutting coefficients kr=v60/(V60) J (as shown in table 2) for example 1 and comparative examples 1, 2, 3 were obtained as compared to the standard 4J36 low expansion alloy (V60) J value, wherein the greater Kr the better the machinability; the smaller Kr, the poorer the machinability. Kr > 1 indicates that the free cutting property of the material is good, and Kr > 2 indicates that the steel of example 1 has excellent tool durability and free cutting property. Meanwhile, statistics is carried out on the types of the chips, the chips in the embodiment 1 are mainly C-shaped chips, and compared with 4J36 gold, the chips are all spiral chips, so that the free-cutting steel has more excellent cutting performance.
Claims (2)
1. The free-cutting low-expansion alloy is characterized by comprising the following chemical components in percentage by weight: carbon: less than 0.08, manganese: 0.30 to 1.00, phosphorus: 0.01 to 0.10 percent, sulfur: 0.020 to 0.100, nickel: 33.5 to 35.5, cobalt: 0.3 to 1.5; wherein the sum of nickel and cobalt is 34.0-37.0, the ratio of manganese to sulfur is 6-15, and the balance is iron and unavoidable impurities.
2. The method of producing a free-cutting low expansion alloy according to claim 1, wherein the method of producing comprises: intermediate frequency furnace smelting, LF furnace refining, continuous casting/die casting cogging, heating by a heating furnace and rolling;
and smelting in the intermediate frequency furnace: batching according to chemical components of the finished product, wherein the grain size of the raw materials is smaller than 100mm; melting raw materials by using an intermediate frequency furnace, and tapping after dissolving;
the LF refining: adding ferromanganese after slag formation of molten steel, adjusting the manganese content to be within the range of 0.30% -1.00%, simultaneously meeting the manganese-sulfur ratio of 6-15, blowing argon to ensure that molten steel does not roll, and controlling alloying refining time to be 30-32 min;
the continuous casting/die casting bloom: preparing a blank by adopting a continuous casting or die casting cogging mode;
the heating furnace heats: heating the casting blank at 1200-1250 ℃ for 3-6 h, and then carrying out surface temperature raising heating, namely heating at 1230-1280 ℃ for 10-30 min;
the rolling comprises the following steps: adopting a recrystallization zone for rolling, and adopting the first 3 passes of anhydrous rolling to form a wire rod and bar straight strip product.
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