CN109136746A - A kind of bimetal bandsaw backing steel band and preparation method thereof - Google Patents
A kind of bimetal bandsaw backing steel band and preparation method thereof Download PDFInfo
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- CN109136746A CN109136746A CN201810845315.4A CN201810845315A CN109136746A CN 109136746 A CN109136746 A CN 109136746A CN 201810845315 A CN201810845315 A CN 201810845315A CN 109136746 A CN109136746 A CN 109136746A
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- 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
- C21D8/0236—Cold rolling
-
- 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
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
-
- 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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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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 Sheet Steel (AREA)
Abstract
The present invention provides a kind of bimetal bandsaw backing steel band, chemical component mass content is as follows: 0.29≤C≤0.33%；0.20%≤Si≤0.35%；0.80%≤Mn≤1.10%；3.50≤Cr≤4.20%；0.20%≤Ni≤0.80%；1.00%≤Mo≤1.40%；0.30%≤V≤0.40%；0% < P≤0.02%；0% < S≤0.025%；Surplus is Fe；Final products testing result of the present invention meet customer need target value 95% or more, enjoyed great popularity by client at present, since bimetal bandsaw development prospect is boundless, great application value, prospect is very wide.
Description
(1) technical field
The present invention relates to a kind of bimetal bandsaw backing steel bands (X32) and preparation method thereof.
(2) background technique
The birth of bimetal bandsaw is a revolution of metal cutting processes development.Compared to traditional saw blade, it has cutting
High-quality, the features such as cutting efficiency is high, energy saving material-saving.Bi-metal bandsaw blades be mainly used for cut general black metal, as cast iron,
Round steel, square steel, fashioned iron；Can also be used to cutting alloy tool steel, structural alloy steel, mould steel, bearing steel, stainless steel and copper,
The non-ferrous metals such as aluminium.
To grope and developed by more than 30 years, the research and development of China bi-metal bandsaw blades enterprise, production level are continuously improved,
The performance and quality of saw blade are also constantly promoted therewith.The country has tens producers to be able to carry out bi-metal bandsaw blades cold working at present
And heat treatment process.
The teeth portion material requirements high hardness/high wear resistant energy of bi-metal bandsaw blades, and backing material then requires high-intensitive, high-ductility
Property and high anti-fatigue performance, since two-part performance requirement is different, used in the teeth portion of bi-metal bandsaw blades and back
Material is also different.
Domestic bi-metal bandsaw blades backing material is mainly X32, the material have higher hardness, wearability, yield tensile ratio and
Red hardness, and there is excellent anti-fatigue performance, elastoresistance performance and corrosion resisting property, while there is toughness appropriate.Bimetallic
Bands for band is repeatedly subjected to the effect of compression and tensile stress in sawing process, it is desirable that saw blade has height in dynamic loading environmental condition
Service life.And due to sawing bad environments, this require the material as bands for band need to have excellent corrosion resistance with
Oxidation resistance.High strength steel X32 can sufficiently meet the requirement of bands for band with its distinctive property.
As China is machined the fast development of preparation industry, metal material sawing kind and quantity are sharply increased,
Bi-metal bandsaw blades backing has wide application market prospect with X32.
According to a large amount of investigational datas to client, the demand of bimetal bandsaw backing steel band is determined are as follows:
(3) summary of the invention
It is an object of the present invention to provide a kind of bimetal bandsaw backing steel bands and preparation method thereof.
The technical solution adopted by the present invention is that:
A kind of bimetal bandsaw backing steel band, chemical component mass content are as follows:
0.29≤C≤0.33%；0.20%≤Si≤0.35%；0.80%≤Mn≤1.10%；
3.50≤Cr≤4.20%；0.20%≤Ni≤0.80%；1.00%≤Mo≤1.40%；
0.30%≤V≤0.40%；0% < P≤0.02%；0% < S≤0.025%；
Surplus is Fe；It is wherein also possible to containing micro inevitable impurity；
, with a thickness of 0.60~1.60mm, width is 327~410mm for it.
Further, it is preferred that the chemical component mass content of the bimetal bandsaw backing steel band is as follows:
0.29≤C≤0.33%；0.20%≤Si≤0.35%；0.90%≤Mn≤1.10%；
3.70≤Cr≤4.00%；0.60%≤Ni≤0.80%；1.00%≤Mo≤1.20%；
0.30%≤V≤0.40%；0% < P≤0.015%；0% < S≤0.005%；
Surplus is Fe.
The invention further relates to the preparation methods of the bimetal bandsaw backing steel band, and the method is specifically according to as follows
Step carries out:
(1) hot rolling:
Hot rolling material chemical component mass content is as follows:
0.29≤C≤0.33%；0.20%≤Si≤0.35%；0.80%≤Mn≤1.10%；
3.50≤Cr≤4.20%；0.20%≤Ni≤0.80%；1.00%≤Mo≤1.40%；
0.30%≤V≤0.40%；0.030%≤Al≤0.090%；0% < P≤0.02%；0% < S≤0.025%；
Surplus is Fe；It is wherein also possible to containing micro inevitable impurity；
1200~1250 DEG C of hot rolling heating temperature, 1150~1200 DEG C of roughing temperature, 900~950 DEG C of final rolling temperature, finish to gauge
Coiling temperature is 600~650 DEG C；The hot rolling product removes the iron scale on surface with 7%~17% aqueous hydrochloric acid solution pickling
Next step cold rolling manipulation is carried out afterwards；
(2) cold rolling:
Twice using the operation of annealing+rolling cold rolling technique, rolling steel band is carried out using single-stand cold-rolling machine；It is described
Single-stand cold-rolling machine unit uses computer automatic control system, it can be achieved that whole process PLC is automatically controlled；Unit has all-hydraulic pressure
Under, hydraulic AGC automatically controls；Crew qiting x-ray calibrator, and the high-resolution photographic device of online observation plate surface quality,
The steel band precision and template for ensuring to shut out reach first-class level；
Identical, the described annealing process of the twice annealing technique are as follows: the steel band that hot rolling obtains first is warming up to 680 DEG C
Keep the temperature 4h, to 750 DEG C after keep the temperature 13h, then cool to 680 DEG C and keep the temperature 6 hours, band cover is cooled to 600 DEG C and changes cooling dome, 300
DEG C start water cooling, 80 DEG C are come out of the stove；The annealing process is carried out using Full Hydrogen Bell Type Annealing Furnace；
The steel band of the annealing is subjected to the rolling steel band once rolled, in the operation of rolling, under a roll compacting
Rate control rolls reduction ratio control 30~40% 40~50%, two；
The steel band once rolled is moved back the steel band that the substitution hot rolling obtains again once to be annealed again, then is rolled
Obtain the steel band of secondary rolling；
(3) slitting
By the steel band of the secondary rolling through slitting line slitting at the bimetal bandsaw backing steel band of target width.
Further, it is preferred that the chemical component mass content of the hot rolling raw material is as follows:
0.29≤C≤0.33%；0.20%≤Si≤0.35%；0.90%≤Mn≤1.10%；
3.70≤Cr≤4.00%；0.60%≤Ni≤0.80%；1.00%≤Mo≤1.20%；
0.30%≤V≤0.40%；0.030%≤Al≤0.090%；0% < P≤0.015%；
0% < S≤0.005%；Surplus is Fe.
The present invention selects special hot rolled strip, strict demand is made on composition and hot rolling technology, using single stand four-roller
Reversable mill rolling, can be effectively ensured the thickness and precision of steel band；It develops for bimetal bandsaw backing steel band performance requirement
Specific perhydro annealing process and flattening process, final products testing result meet customer need target value 95% or more,
As the example of technical progress of industry, the progress of domestic and international cold-rolled strip rolling mill practice is pushed, is provided to downstream client good
Raw material.
Steel band quality requirement:
(1) steel band mechanical property:
Steel band tension test takes lateral sample, and mechanical property need to meet the regulation of table 1:
1 steel band mechanical property of table
(2) skid wire
There is not skid wire in 3 months after guaranteeing factory.
(3) surface quality
Steel strip surface must not scab, crackle, drawing crack, be mingled with, iron scale, iron rust and layering, be not allow for blue oxidation
Color and yellow membrane phenomenon, allowing to have does not influence mouldability and painting, the defect for plating adhesive force, such as minute bubbles, small scratch, small roll marks, light
Micro- scuffing and oxidation tint etc. allow to exist.
The beneficial effects are mainly reflected as follows:
(1) hot rolling raw material chemical analysis is used by the design production of defined composition, and hot rolling production uses aforementioned three high and one low
Temperature schedule, rolled raw tissue can be refined, be convenient for subsequent cold rolling and spheroidizing, be suitble to obtain preferable quenching
Tissue；
(2) using advanced single chassis reversable mill rolling is configured, guarantee thickness and precision；
Bimetal bandsaw backing steel band of the present invention has fully met the strong of panel of refrigerator steel on probation through test of many times
The quality requirement of degree, hardness and elongation percentage, is enjoyed great popularity at present by client, before developing due to household electrical appliances cold-rolled strip
Scape is boundless, great application value.
(4) Detailed description of the invention
Fig. 1 typical metallographic structure of bimetal bandsaw backing steel band of the present invention.
(5) specific embodiment
The present invention is described further combined with specific embodiments below, but protection scope of the present invention is not limited in
This:
Embodiment 1:
(1) hot rolling
Hot rolling raw material composition and content (%) see the table below 2:
2 hot rolling material composition of table and content (%)
| Serial number | C | Si | Mn | Ni | Cr | V | Al | P | S |
| 1 | 0.30 | 0.25 | 0.83 | 0.63 | 3.76 | 0.31 | 0.056 | 0.011 | 0.003 |
| 2 | 0.31 | 0.28 | 0.85 | 0.63 | 3.77 | 0.32 | 0.058 | 0.009 | 0.001 |
| 3 | 0.32 | 0.30 | 1.00 | 0.75 | 3.91 | 0.34 | 0.064 | 0.007 | 0.002 |
Surplus is Fe and micro inevitable impurity；
1200~1250 DEG C of hot rolling heating temperature, 1150~1200 DEG C of roughing temperature, 900~950 DEG C of final rolling temperature, finish to gauge
Coiling temperature is 600~650 DEG C；
(2) cold rolling
It is rolled after the hot band anneal through single chassis reversable mill, specific process parameter is as shown in table 3 below；
3 cold-rolling process parameter of table
The annealing process carries out in Full Hydrogen Bell Type Annealing Furnace, and twice annealing uses identical technique, and specific process parameter is shown in
The following table 4:
4 parameter and annealing of table
| Annealing process control parameter title | Parameters controlling value |
| Thickness (mm) | 1.0~3.5 |
| Width (mm) | 327~410 |
| Batch (T) | 80~95 |
| First segment heating (DEG C/h) | 680/8 |
| First segment keeps the temperature platform (DEG C) | 680 |
| First segment soaking time (h) | 4 |
| Second segment heats used time (h) | 3 |
| Second segment keeps the temperature platform (DEG C) | 750 |
| Second segment soaking time (h) | 13 |
| Third section cools down used time (h) | 3.5 |
| Third section keeps the temperature platform (DEG C) | 680 |
| Third section soaking time (h) | 6 |
| It sprays temperature (DEG C) | 300 |
| Tapping temperature (DEG C) | 80 |
Steel band quality testing is made:
(1) steel band mechanical property
Steel band tension test takes lateral sample, and mechanical property is for example as shown in table 5:
5 mechanical property of table
| Sample Number | Tension Rm | Extend A80mm | Hardness (HV) |
| 1# sample | 848 | 4.3 | 255 |
| 2# sample | 893 | 4.4 | 256 |
| 3# sample | 883 | 3.6 | 262 |
Thickness of strips of the present invention is thin, and intensity is high, and nodularization effect is good.
(2) skid wire
Do not occur skid wire after factory in 3 months.
(3) surface quality
Steel strip surface without scab, crackle, drawing crack, be mingled with, iron scale, iron rust and layering, no blue oxidation tint and yellow membrane it is existing
As.(4) metallographic structure
2# sample bimetal bandsaw backing is made with the typical metallographic structure of steel band X32 referring to Fig. 1, which is nodularization pearly-lustre
Body, Oxygen potential 90%.
Comparative example
(1) material composition
Hot rolling material composition and content (%) are shown in Table 6:
6 hot rolling material composition of table and content (%)
| Serial number | C | Si | Mn | Ni | Cr | V | Al | P | S |
| 1 | 0.33 | 0.29 | 0.80 | 0.64 | 3.00 | 0.25 | 0.049 | 0.006 | 0.002 |
| 2 | 0.32 | 0.28 | 0.85 | 0.65 | 3.12 | 0.21 | 0.057 | 0.007 | 0.003 |
| 3 | 0.31 | 0.31 | 0.81 | 0.66 | 3.11 | 0.24 | 0.054 | 0.005 | 0.001 |
Surplus is Fe and micro inevitable impurity；
1200~1250 DEG C of hot rolling heating temperature, 1150~1200 DEG C of roughing temperature, 900~950 DEG C of final rolling temperature, finish to gauge
Coiling temperature is 600~650 DEG C；
(2) cold rolling feeds thickness, cold rolling technique are all consistent with embodiment, as shown in table 7.
7 cold rolling technique of table
Twice annealing equally carries out all in Full Hydrogen Bell Type Annealing Furnace, and annealing process is consistent with embodiment, as shown in table 8.
8 parameter and annealing of table
| Annealing process control parameter title | Parameters controlling value |
| Thickness (mm) | 1.0~3.5 |
| Width (mm) | 327~410 |
| Batch (T) | 80~95 |
| First segment heating (DEG C/h) | 680/8 |
| First segment keeps the temperature platform (DEG C) | 680 |
| First segment soaking time (h) | 4 |
| Second segment heats used time (h) | 3 |
| Second segment keeps the temperature platform (DEG C) | 750 |
| Second segment soaking time (h) | 13 |
| Third section cools down used time (h) | 3.5 |
| Third section keeps the temperature platform (DEG C) | 680 |
| Third section soaking time (h) | 6 |
| It sprays temperature (DEG C) | 300 |
| Tapping temperature (DEG C) | 80 |
(4) performance
Under raw thickness, rolling procedure same case, cold-rolled strip end properties such as 9 institute of table of same thickness is obtained
Show:
9 performance parameter of table
| Sample Number | Tension Rm | Extend A80mm | Hardness (HV) |
| 1# sample | 811 | 6.3 | 238 |
| 2# sample | 798 | 5.2 | 237 |
| 3# sample | 805 | 5.7 | 233 |
Compared with comparative example, but thickness of strips of the present invention is thinner, and hardness and strength are more excellent.
Claims (4)
1. a kind of bimetal bandsaw backing steel band, chemical component mass content are as follows:
0.29≤C≤0.33%；0.20%≤Si≤0.35%；0.80%≤Mn≤1.10%；
3.50≤Cr≤4.20%；0.20%≤Ni≤0.80%；1.00%≤Mo≤1.40%；
0.30%≤V≤0.40%；0% < P≤0.02%；0% < S≤0.025%；
Surplus is Fe；The bimetal bandsaw backing steel band with a thickness of 0.60~1.60mm, width is 327~410mm.
2. bimetal bandsaw backing steel band as described in claim 1, it is characterised in that: the bimetal bandsaw backing steel
The chemical component mass content of band is as follows:
0.29≤C≤0.33%；0.20%≤Si≤0.35%；0.90%≤Mn≤1.10%；
3.70≤Cr≤4.00%；0.60%≤Ni≤0.80%；1.00%≤Mo≤1.20%；
0.30%≤V≤0.40%；0% < P≤0.015%；0% < S≤0.005%；
Surplus is Fe.
3. the preparation method of bimetal bandsaw backing steel band as described in claim 1, it is characterised in that: the method is specific
It carries out in accordance with the following steps:
(1) hot rolling:
Hot rolling material chemical component mass content is as follows:
0.29≤C≤0.33%；0.20%≤Si≤0.35%；0.80%≤Mn≤1.10%；
3.50≤Cr≤4.20%；0.20%≤Ni≤0.80%；1.00%≤Mo≤1.40%；
0.30%≤V≤0.40%；0.030%≤Al≤0.090%；0% < P≤0.02%；
0% < S≤0.025%；Surplus is Fe；
1200~1250 DEG C of hot rolling heating temperature, 1150~1200 DEG C of roughing temperature, 900~950 DEG C of final rolling temperature, finish to gauge is batched
Temperature is 600~650 DEG C；The hot rolling product is laggard with the iron scale that 7%~17% aqueous hydrochloric acid solution pickling removes surface
Row next step cold rolling manipulation；
(2) cold rolling:
Using annealing, rolling, re-annealing, then the cold rolling technique operation rolled, rolling steel is carried out using single-stand cold-rolling machine
Band；
Identical, the described annealing process of the twice annealing technique are as follows: the steel band that hot rolling obtains first is warming up to 680 DEG C of heat preservations
4h, to 750 DEG C after keep the temperature 13h, then cool to 680 DEG C and keep the temperature 6 hours, band cover is cooled to 600 DEG C and changes cooling dome, and 300 DEG C are opened
Beginning water cooling, 80 DEG C are come out of the stove；The annealing process is carried out using Full Hydrogen Bell Type Annealing Furnace；
The steel band of the annealing is subjected to the rolling steel band once rolled, in the operation of rolling, one rolls reduction ratio control
System rolls reduction ratio control 30~40% 40~50%, two；
The steel band once rolled is moved back the steel band that the substitution hot rolling obtains again once to be annealed again, then rolling
The steel band of secondary rolling；
(3) slitting
By the steel band of the secondary rolling through slitting line slitting at the bimetal bandsaw backing steel band of target width.
4. method as claimed in claim 3, it is characterised in that: the chemical component mass content of the hot rolling raw material is as follows:
0.29≤C≤0.33%；0.20%≤Si≤0.35%；0.90%≤Mn≤1.10%；
3.70≤Cr≤4.00%；0.60%≤Ni≤0.80%；1.00%≤Mo≤1.20%；
0.30%≤V≤0.40%；0.030%≤Al≤0.090%；0% < P≤0.015%；
0% < S≤0.005%；Surplus is Fe.
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| CN201810845315.4A CN109136746A (en) | 2018-07-27 | 2018-07-27 | A kind of bimetal bandsaw backing steel band and preparation method thereof |
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| CN201810845315.4A CN109136746A (en) | 2018-07-27 | 2018-07-27 | A kind of bimetal bandsaw backing steel band and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110117706A (en) * | 2019-06-19 | 2019-08-13 | 南通江勤美金属制品有限公司 | Horse shellfish complex tissue material strip production technology |
| CN110202021A (en) * | 2019-06-19 | 2019-09-06 | 南通江勤美金属制品有限公司 | Shellfish horse complex tissue material strip production technology |
| CN113265527A (en) * | 2021-04-30 | 2021-08-17 | 浙江龙盛薄板有限公司 | Cold rolling and annealing process for avoiding mixed crystal defect of alloy saw blade steel X32 and application thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101358321A (en) * | 2008-09-08 | 2009-02-04 | 杭州钢铁集团公司 | HG20 back material steel for high strength and toughness bimetallic strip saw blade |
| CN102943215A (en) * | 2012-10-27 | 2013-02-27 | 无锡舜特精密合金板带有限公司 | Backing material for double metal composite saw blade, and preparation method thereof |
-
2018
- 2018-07-27 CN CN201810845315.4A patent/CN109136746A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101358321A (en) * | 2008-09-08 | 2009-02-04 | 杭州钢铁集团公司 | HG20 back material steel for high strength and toughness bimetallic strip saw blade |
| CN102943215A (en) * | 2012-10-27 | 2013-02-27 | 无锡舜特精密合金板带有限公司 | Backing material for double metal composite saw blade, and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110117706A (en) * | 2019-06-19 | 2019-08-13 | 南通江勤美金属制品有限公司 | Horse shellfish complex tissue material strip production technology |
| CN110202021A (en) * | 2019-06-19 | 2019-09-06 | 南通江勤美金属制品有限公司 | Shellfish horse complex tissue material strip production technology |
| CN113265527A (en) * | 2021-04-30 | 2021-08-17 | 浙江龙盛薄板有限公司 | Cold rolling and annealing process for avoiding mixed crystal defect of alloy saw blade steel X32 and application thereof |
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Application publication date: 20190104 |
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