CN112239824A - High-nickel lead-containing free-cutting material and grain structure densification production process thereof - Google Patents
High-nickel lead-containing free-cutting material and grain structure densification production process thereof Download PDFInfo
- Publication number
- CN112239824A CN112239824A CN201910654335.8A CN201910654335A CN112239824A CN 112239824 A CN112239824 A CN 112239824A CN 201910654335 A CN201910654335 A CN 201910654335A CN 112239824 A CN112239824 A CN 112239824A
- Authority
- CN
- China
- Prior art keywords
- wire rod
- cutting material
- containing free
- percent
- nickel lead
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
- C22C9/04—Alloys based on copper with zinc as the next major constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
Abstract
The invention relates to the technical field of alloy processing, and aims to provide a high-nickel lead-containing free-cutting material and a grain structure densification production process thereof, wherein the key points of the technical scheme are as follows: comprises the following components in percentage by weight: 15.0 to 18.0 percent of Ni, 55.0 to 60.0 percent of Cu, 1.2 to 1.6 percent of Pb, 0.1 to 0.5 percent of Fe, 0.02 percent of La0, 0.02 percent of Ce, 0.01 to 0.1 percent of B and 0.01 to 0.1 percent of Zr; the production process comprises the following steps: s1, alloy smelting is carried out on the components, and then the components are continuously cast into a wire blank on a horizontal continuous casting machine; s2, stretching, straightening and peeling the wire blank on a wire rod combined peeling machine to form a semi-finished wire rod with smaller diameter; s3, performing rotary hammer forging on the semi-finished wire rod in the step S2 on a rotary forging machine to enable the internal grain structure of the semi-finished wire rod to be further compact; and S4, winding the wire rod in the step S3 into a coil, and carrying out annealing heat treatment to finally form a finished wire rod. The invention has the advantages of simple and stable processing technology, good compactness of the processed wire and high size consistency.
Description
Technical Field
The invention relates to the technical field of alloy processing, in particular to a high-nickel lead-containing free-cutting material and a grain structure densification production process thereof.
Background
The high-nickel lead-containing free-cutting material is mainly a copper alloy taking nickel as a main alloy element, wherein the copper alloy has the most representative property and is most widely applied to cupronickel, and the cupronickel, particularly zinc cupronickel not only has silvery white appearance, but also has excellent corrosion resistance, higher strength and good processing performance, and is widely applied to the fields of zippers, watch chains, spectacle frame hinges, decorative artware and the like. The main processing process of the copper alloy with various processing forms, including copper alloy strip, copper alloy wire and the like, can be regarded as a process of continuously forging a copper alloy blank to enable the grain structure in the copper alloy to become more compact so as to achieve a specific shape and size.
Chinese patent No. CN1162560C discloses a corrosion-resistant white copper-manganese alloy and a method for manufacturing the same, which comprises the following components by weight percent: 9-15% of Mn, 9-15% of Zn, 0.5-1.5% of Al, 0-1.5% of Sn, not more than 0.2% of rare earth and the balance of copper; the manufacturing method of the corrosion-resistant white copper-manganese alloy wire rod comprises the following steps: the method comprises the steps of non-vacuum smelting, heat preservation, deslagging, keeping the casting temperature at 1050-1150 ℃, continuously casting on a horizontal continuous casting machine to form a wire blank, cold-drawing the wire blank to form a semi-finished blank, annealing at 700-750 ℃ for 120-240 minutes, pickling, cold-rolling to form a flat wire blank, annealing at 670-720 ℃ for 120-240 minutes, pickling, and finally cold-drawing to form a finished wire.
Although the appearance and the color of the copper alloy wire manufactured by the prior technical scheme are close to those of common zinc white copper and have better corrosion resistance, the copper alloy wire needs to be subjected to acid pickling for many times and then cold-drawn by rolling, more acidic wastewater is generated in the production process, the difficulty and the cost of sewage treatment are increased, potential safety hazards also exist in the acid pickling process, and potential health hazards can be caused to workers. Therefore, the development of a high-efficiency and safe machining process of the free-cutting copper alloy wire rod has great significance.
SUMMARY OF THE PATENT FOR INVENTION
The invention aims to provide a high-nickel lead-containing free-cutting material and a grain structure densification production process thereof, and the high-nickel lead-containing free-cutting material has the advantages of simple and stable processing process, good compactness of processed wires and high size consistency.
The technical purpose of the invention is realized by the following technical scheme:
a high-nickel lead-containing free-cutting material comprises the following components in percentage by weight: 15.0-18.0% of Ni, 55.0-60.0% of Cu, 1.2-1.6% of Pb, 0.1-0.5% of Fe, not less than 0.02% of rare earth and the balance of Zn and inevitable impurities, wherein the content of Ni, Cu and Zn in the alloy components is not less than 97.5%, and the sum of the content of each component is 100%.
By adopting the technical scheme, the Zn element can improve the atmospheric corrosion resistance of the cupronickel alloy, and the wear resistance and the corrosion resistance of the cupronickel alloy can be effectively improved under the synergistic effect of the Zn element and the Ni element; lead is added into the zinc-copper alloy, and lead atoms are dispersed among alloy grain structures to play a certain lubricating role, so that the cutting performance of the zinc-copper alloy is effectively improved; the rare earth element as an additive can refine the grain structure of the zinc-copper alloy, improve the compactness of the grain structure and purify and remove impurities, thereby achieving the effects of improving the compactness, the machinability and the processing consistency of the grain structure of the alloy material.
Further, the rare earth elements include La and Ce in a mass ratio of 1: 1.
By adopting the technical scheme, the rare earth elements La and Ce are added, so that the as-cast columnar crystal structure can be eliminated, the crystal grains are obviously refined, and the alloy metallographic structure form is changed, thereby achieving the effects of improving the hot processing performance and the room-temperature mechanical property of the alloy, and enabling the alloy to be easily stretched and extended at room temperature.
Further, the content of the rare earth element La is 0.02% by weight, and the content of the rare earth element Ce is 0.02% by weight.
By adopting the technical scheme, the weight percentage content of the rare earth elements La and Ce is controlled to be the same, the compound synergistic effect of the La and Ce can be effectively utilized, the stability and the uniformity of the alloy grain refinement process are improved, the effect of improving the refinement consistency of the alloy grain structure is further achieved, and the mechanical property stability of the alloy is improved.
Further, the high-nickel lead-containing free-cutting material also comprises the following components in percentage by weight: B. at least one of two elements of Zr.
By adopting the technical scheme, both B, Zr elements have high chemical activity and can be used as grain refiners to promote the refining treatment of the grain structure of the zinc-copper alloy, thereby achieving the effects of improving the alloy strength and the corrosion resistance.
Further, the B, Zr comprises the following two elements in percentage by weight: 0.01 to 0.1 percent of B and 0.01 to 0.1 percent of Zr.
By adopting the technical scheme, the stability and the uniformity of the alloy grain refinement process can be further improved by utilizing the compounding synergistic effect of the B, Zr elements, so that the effect of improving the refinement consistency of the alloy grain structure is achieved, and the mechanical strength and the ductility of the alloy are effectively improved.
Further, the grain structure densification process of the high-nickel lead-containing free-cutting material comprises the following steps of:
s1, carrying out alloy melting and heat preservation on the components at 1300-1380 ℃, and then continuously casting the components on a horizontal continuous casting machine to form a wire blank;
s2, stretching, straightening and peeling the wire blank on a wire rod combined peeling machine, and processing the wire blank into a semi-finished wire rod with a smaller diameter;
s3, performing rotary hammer forging on the semi-finished wire rod prepared in the step S2 on a rotary forging machine, so that the diameter of the semi-finished wire rod is further reduced, and the grain structure in the wire rod is further compact;
s4, winding the wire rod forged by the rotary hammer of the rotary forging machine in the step S3 into a coil;
and S5, carrying out annealing heat treatment on the coiled wire rod to finally form a finished wire rod.
By adopting the technical scheme, the alloy wire blank is stretched and straightened by a wire rod combined peeling machine, and the rough skin layer part of the outer layer is peeled off to obtain a semi-finished wire rod with smaller diameter; performing rotary hammer forging at room temperature by using a rotary forging machine to further compact the energy tissues in the wire rod so as to obtain a thinner wire rod; and annealing treatment enables the wire to be finally heat-set to form a finished wire with stable mechanical property.
Further, in step S5, a bell jar annealing furnace is used to perform annealing heat treatment on the wire.
By adopting the technical scheme, the heat-resistant stainless steel bell jar and the furnace platform are strictly sealed, so that the workpiece material is isolated from the outside air, and is always protected by high-purity nitrogen and hydrogen gas in the heating, heat preservation and cooling processes, thereby ensuring that the surface of the annealing material is bright and is not oxidized. On the other hand, because the high-strength convection fan is arranged in the furnace, the atmosphere in the furnace forms strong convection circulation, the temperature of the furnace is promoted to be uniform, the temperature difference of each point in the furnace is small, and therefore the annealing material obtains uniform and consistent physical and mechanical properties.
Further, the annealing temperature in the step S5 is 600 ℃ to 700 ℃.
By adopting the technical scheme, the alloy wire can be shaped with better mechanical property at the temperature.
In conclusion, the invention has the following beneficial effects:
1. according to the invention, rare earth elements La and Ce with a mass ratio of 1:1 are added into the alloy, so that as-cast columnar crystal structure can be eliminated, crystal grains are obviously refined, and the metallographic structure of the alloy is changed, thereby achieving the effects of improving the hot workability and the room temperature mechanical property of the alloy, and enabling the alloy to be easily stretched and extended at room temperature;
2. according to the invention, B, Zr two elements with high chemical activity are further added, and can be used as grain refiners to promote the refining treatment of the zinc-copper alloy grain structure, so that the effects of improving the alloy strength and corrosion resistance are achieved;
3. according to the invention, the zinc-white copper alloy wire with a specific specification is processed and obtained under relatively simple and stable processing conditions by adopting combined peeling, rotary hammer forging and bell jar type annealing furnace annealing at room temperature, so that the production cost is reduced.
Detailed Description
The patent of the present invention is further described in detail below with reference to the comparative examples of the examples.
Examples
Example 1: the high-nickel lead-containing free-cutting material comprises the following components in percentage by weight: 15.0% of Ni, 55.0% of Cu, 27.5% of Zn, 1.2% of Pb, 0.1% of Fe, 0.02% of La, 0.02% of Ce, 0.01% of B, 0.01% of Zr and the balance of inevitable impurities, wherein the sum of the contents of all the components is 100%;
a grain structure densification process of a high-nickel lead-containing free-cutting material comprises the following steps:
s1, carrying out alloy melting and heat preservation on the components at 1300 ℃, and then continuously casting the components on a horizontal continuous casting machine to form a wire blank;
s2, stretching, straightening and peeling the wire blank on a wire rod combined peeling machine, and processing the wire blank into a semi-finished wire rod with a smaller diameter;
s3, performing rotary hammer forging on the semi-finished wire rod prepared in the step S2 on a rotary forging machine, so that the diameter of the semi-finished wire rod is further reduced, and the grain structure in the wire rod is further compact;
s4, winding the wire rod forged by the rotary hammer of the rotary forging machine in the step S3 into a coil;
and S5, annealing the coiled wire by using a bell jar type annealing furnace at the annealing temperature of 600 ℃ to finally form a finished wire.
Example 2: the high-nickel lead-containing free-cutting material comprises the following components in percentage by weight: 16.0% of Ni, 57.0% of Cu, 24.5% of Zn, 1.3% of Pb, 0.2% of Fe, 0.02% of La, 0.02% of Ce, 0.03% of B, 0.03% of Zr and the balance of inevitable impurities, wherein the sum of the contents of all the components is 100%;
a grain structure densification process of a high-nickel lead-containing free-cutting material comprises the following steps:
s1, carrying out alloy melting and heat preservation on the components at 1330 ℃, and then continuously casting the components on a horizontal continuous casting machine to form a wire blank;
s2, stretching, straightening and peeling the wire blank on a wire rod combined peeling machine, and processing the wire blank into a semi-finished wire rod with a smaller diameter;
s3, performing rotary hammer forging on the semi-finished wire rod prepared in the step S2 on a rotary forging machine, so that the diameter of the semi-finished wire rod is further reduced, and the grain structure in the wire rod is further compact;
s4, winding the wire rod forged by the rotary hammer of the rotary forging machine in the step S3 into a coil;
and S5, annealing the coiled wire by using a bell jar type annealing furnace at the annealing temperature of 630 ℃, and finally forming a finished wire.
Example 3: the high-nickel lead-containing free-cutting material comprises the following components in percentage by weight: 17.0% of Ni, 59.0% of Cu, 21.5% of Zn, 1.4% of Pb, 0.4% of Fe, 0.02% of La, 0.02% of Ce, 0.06% of B, 0.06% of Zr and the balance of inevitable impurities, wherein the sum of the contents of all the components is 100%;
a grain structure densification process of a high-nickel lead-containing free-cutting material comprises the following steps:
s1, carrying out alloy melting and heat preservation on the components at 1360 ℃, and then continuously casting the components on a horizontal continuous casting machine to form a wire blank;
s2, stretching, straightening and peeling the wire blank on a wire rod combined peeling machine, and processing the wire blank into a semi-finished wire rod with a smaller diameter;
s3, performing rotary hammer forging on the semi-finished wire rod prepared in the step S2 on a rotary forging machine, so that the diameter of the semi-finished wire rod is further reduced, and the grain structure in the wire rod is further compact;
s4, winding the wire rod forged by the rotary hammer of the rotary forging machine in the step S3 into a coil;
and S5, annealing the coiled wire by using a bell jar type annealing furnace at 660 ℃, and finally forming a finished wire.
Example 4: the high-nickel lead-containing free-cutting material comprises the following components in percentage by weight: 18.0% of Ni, 60.0% of Cu, 19.5% of Zn, 1.6% of Pb, 0.5% of Fe, 0.02% of La, 0.02% of Ce, 0.1% of B, 0.1% of Zr and the balance of inevitable impurities, wherein the sum of the contents of all the components is 100%;
a grain structure densification process of a high-nickel lead-containing free-cutting material comprises the following steps:
s1, carrying out alloy melting and heat preservation on the components at 1380 ℃, and then continuously casting the components on a horizontal continuous casting machine to form a wire blank;
s2, stretching, straightening and peeling the wire blank on a wire rod combined peeling machine, and processing the wire blank into a semi-finished wire rod with a smaller diameter;
s3, performing rotary hammer forging on the semi-finished wire rod prepared in the step S2 on a rotary forging machine, so that the diameter of the semi-finished wire rod is further reduced, and the grain structure in the wire rod is further compact;
s4, winding the wire rod forged by the rotary hammer of the rotary forging machine in the step S3 into a coil;
and S5, annealing the coiled wire by using a bell jar type annealing furnace at 700 ℃, and finally forming a finished wire.
Comparative example
Comparative example 1: the difference from example 1 is that no Pb element was added.
Comparative example 2: the difference from the example 1 is that La and Ce elements are not added.
Comparative example 3: the difference from example 1 is that no B, Zr element was added.
Performance detection
Alloy sample wires were prepared by the methods of examples 1 to 4 and comparative examples 1 to 3, and 3 wires of the same length were cut out as test samples for each of the examples and comparative examples, and the test samples were tested according to the following test items. The test results of the sample wires produced by the same method were averaged and are shown in table 1:
TABLE 1 test results of the wire rods of the respective examples and comparative examples above
| Test items | Tensile strength Mpa | Elongation percentage% | Machinability% |
| Example 1 | 742 | 7 | 78.2 |
| Example 2 | 738 | 6 | 77.9 |
| Example 3 | 736 | 6 | 77.8 |
| Example 4 | 739 | 7 | 78.1 |
| Comparative example 1 | 735 | 5 | 73.4 |
| Comparative example 2 | 732 | 5 | 75.5 |
| Comparative example 3 | 737 | 5 | 74.8 |
As can be seen from the test results in Table 1, the tensile strengths of examples 1 to 4 are slightly higher than those of comparative examples 1 to 3, but the differences are not obvious, which indicates that the tensile strength of the zinc-copper-nickel alloy is determined by the types and contents of the main elements. As can be seen from the results of the elongation and machinability tests, the results of the tests in examples 1 to 4 are superior to those of the tests in comparative examples 1 to 3, which shows that the addition of Pb, La, Ce, B and Zr elements in the zinc-copper-nickel alloy can effectively refine alloy grains and improve the compactness of the grain structure, thereby enhancing the machinability and ductility of the alloy and being beneficial to improving the easy-workability of the alloy.
The present embodiment is only for explaining the patent of the present invention, and it is not limited to the patent of the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as required after reading the present specification, but all are protected by the patent law within the scope of the claims of the present patent.
Claims (8)
1. A high-nickel lead-containing free-cutting material is characterized in that: comprises the following components in percentage by weight: 15.0-18.0% of Ni, 55.0-60.0% of Cu, 1.2-1.6% of Pb, 0.1-0.5% of Fe, not less than 0.02% of rare earth and the balance of Zn and inevitable impurities, wherein the content of Ni, Cu and Zn in the alloy components is not less than 97.5%, and the sum of the content of each component is 100%.
2. The high-nickel lead-containing free-cutting material according to claim 1, wherein: the rare earth elements comprise La and Ce in a mass ratio of 1: 1.
3. The high-nickel lead-containing free-cutting material according to claim 2, wherein: the weight percentage content of the rare earth element La is 0.02%, and the weight percentage content of the rare earth element Ce is 0.02%.
4. The high-nickel lead-containing free-cutting material according to claim 3, wherein: the high-nickel lead-containing free-cutting material also comprises the following components in percentage by weight: B. at least one of two elements of Zr.
5. The high-nickel lead-containing free-cutting material according to claim 4, wherein: the B, Zr comprises the following two elements in percentage by weight: 0.01 to 0.1 percent of B and 0.01 to 0.1 percent of Zr.
6. The process for densifying the grain structure of the high-nickel lead-containing free-cutting material according to claims 1 to 5, wherein: the method comprises the following steps:
s1, carrying out alloy melting and heat preservation on the components at 1300-1380 ℃, and then continuously casting the components on a horizontal continuous casting machine to form a wire blank;
s2, stretching, straightening and peeling the wire blank on a wire rod combined peeling machine, and processing the wire blank into a semi-finished wire rod with a smaller diameter;
s3, performing rotary hammer forging on the semi-finished wire rod prepared in the step S2 on a rotary forging machine, so that the diameter of the semi-finished wire rod is further reduced, and the grain structure in the wire rod is further compact;
s4, winding the wire rod forged by the rotary hammer of the rotary forging machine in the step S3 into a coil;
and S5, carrying out annealing heat treatment on the coiled wire rod to finally form a finished wire rod.
7. The process of claim 6, wherein the grain structure of the high-nickel lead-containing free-cutting material is densified, and the process comprises the following steps: in the step S5, a bell jar annealing furnace is used to perform annealing heat treatment on the wire.
8. The process of claim 7, wherein the grain structure of the high-nickel lead-containing free-cutting material is densified, and the process comprises the following steps: the annealing temperature in the step S5 is 600-700 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910654335.8A CN112239824A (en) | 2019-07-19 | 2019-07-19 | High-nickel lead-containing free-cutting material and grain structure densification production process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910654335.8A CN112239824A (en) | 2019-07-19 | 2019-07-19 | High-nickel lead-containing free-cutting material and grain structure densification production process thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112239824A true CN112239824A (en) | 2021-01-19 |
Family
ID=74167357
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910654335.8A Pending CN112239824A (en) | 2019-07-19 | 2019-07-19 | High-nickel lead-containing free-cutting material and grain structure densification production process thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112239824A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01116041A (en) * | 1987-10-29 | 1989-05-09 | Nippon Mining Co Ltd | Material for piezoelectric vibrator case |
| JPH0469218B2 (en) * | 1988-01-06 | 1992-11-05 | Sanho Shindo Kogyo Kk | |
| EP0657555A1 (en) * | 1993-11-18 | 1995-06-14 | DIEHL GMBH & CO. | Copper-zinc alloy |
| CN101070573A (en) * | 2007-06-27 | 2007-11-14 | 北京有色金属研究总院 | Bismuth-contained lead-free easy-to-cut zinc-white copper alloy |
| CN101565784A (en) * | 2009-05-27 | 2009-10-28 | 宁波敖达金属新材料有限公司 | Lead-free free-cutting calcium-yellow brass alloy |
| CN105483428A (en) * | 2014-09-16 | 2016-04-13 | 陈国良 | Production process of cupronickel spectacle frame |
-
2019
- 2019-07-19 CN CN201910654335.8A patent/CN112239824A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01116041A (en) * | 1987-10-29 | 1989-05-09 | Nippon Mining Co Ltd | Material for piezoelectric vibrator case |
| JPH0469218B2 (en) * | 1988-01-06 | 1992-11-05 | Sanho Shindo Kogyo Kk | |
| EP0657555A1 (en) * | 1993-11-18 | 1995-06-14 | DIEHL GMBH & CO. | Copper-zinc alloy |
| CN101070573A (en) * | 2007-06-27 | 2007-11-14 | 北京有色金属研究总院 | Bismuth-contained lead-free easy-to-cut zinc-white copper alloy |
| CN101565784A (en) * | 2009-05-27 | 2009-10-28 | 宁波敖达金属新材料有限公司 | Lead-free free-cutting calcium-yellow brass alloy |
| CN105483428A (en) * | 2014-09-16 | 2016-04-13 | 陈国良 | Production process of cupronickel spectacle frame |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103276307B (en) | A kind of highly corrosion resistant high ductility high chromium ferritic stainless steel steel plate and its manufacture method | |
| US20200071807A1 (en) | Light-weight, high-strength, and high-elasticity titanium alloy and implementation method thereof | |
| CN109266901B (en) | Preparation method of Cu15Ni8Sn high-strength wear-resistant alloy rod/wire | |
| CN104762540B (en) | A kind of high-damping Manganese Copper Shock-absorption Alloy and its manufacture method | |
| JP2010159487A (en) | High-purity ferritic stainless steel having excellent corrosion resistance, and method for producing the same | |
| CN103014410B (en) | Copper alloy and fabrication method thereof | |
| CN102251192A (en) | Enamel steel and production method thereof | |
| CN105200359A (en) | Heat treatment method capable of reducing stress of spray-formed 7000 series aluminum alloy products | |
| CN102021295B (en) | Cold-rolling steel belt for flux-cored wire and manufacture method thereof | |
| CN110656286A (en) | High-strength bolt and processing method thereof | |
| CN105369077B (en) | Aluminum alloy conductor material and preparation method thereof | |
| CN106319282B (en) | A kind of low cost, high-ductility, seawater corrosion resistance titanium alloy | |
| JP2018012874A (en) | Method of manufacturing steel wire for bolt | |
| CN117165809A (en) | Titanium copper alloy pipe and preparation method thereof | |
| CN106319370A (en) | Medium-chromium ferrite stainless steel with excellent plasticity and high strength and manufacturing method of medium-chromium ferrite stainless steel | |
| CN107974574B (en) | Stress relaxation-resistant complex brass alloy and preparation method thereof | |
| CN114196895A (en) | Manufacturing method of high-strength aluminum alloy cold-drawn bar for aerospace fastener | |
| CN116944244A (en) | High-strength high-toughness corrosion-resistant 6xxx series aluminum alloy rolling process | |
| CN112239824A (en) | High-nickel lead-containing free-cutting material and grain structure densification production process thereof | |
| CN113481428B (en) | High-tensile-strength aluminum-containing or aluminum-silicon-containing coated steel plate and manufacturing method of hot-formed steel member thereof | |
| CN109504871B (en) | High-strength titanium-copper alloy wire suitable for conductive elastic component and manufacturing method thereof | |
| CN110951953B (en) | HRB500E steel bar and vanadium-nitrogen microalloying process thereof | |
| JP5273344B2 (en) | High strength stainless steel wire with excellent cold workability and its molded product | |
| CN103667931A (en) | Anti-oxidation ferrite stainless steel containing aluminum and rare earth | |
| CN110016584B (en) | Wire rod and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210119 |
|
| RJ01 | Rejection of invention patent application after publication |