CN107790498A - Cold rolling high strength car sheet specialized high-speed steel combines roller and its manufacture method - Google Patents
Cold rolling high strength car sheet specialized high-speed steel combines roller and its manufacture method Download PDFInfo
- Publication number
- CN107790498A CN107790498A CN201710833456.XA CN201710833456A CN107790498A CN 107790498 A CN107790498 A CN 107790498A CN 201710833456 A CN201710833456 A CN 201710833456A CN 107790498 A CN107790498 A CN 107790498A
- Authority
- CN
- China
- Prior art keywords
- speed steel
- roll body
- centre bore
- cold rolling
- roller
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- 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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
Abstract
The invention discloses a kind of cold rolling high strength car sheet specialized high-speed steel combination roller and its manufacture method, it be high-speed steel roll body by not setting centre bore and interference fit installed in high-speed steel roll body both ends and the low-carbon steel rider set group provided with centre bore into；Its manufacture method includes：1. manufacture roll body base, machining center hole, Quenching Treatment, half are refined and removed centre bore and obtain high-speed steel roll body；2. manufacture roller set base, machining center hole, modifier treatment, the 60 ° of conical surfaces progress salt bath furnace grade quenches in two pairs of rollers set base end face and centre bore and rebuilding centre bore obtain low-carbon steel rider set；3. low-carbon steel rider set interference fit is arranged on into high-speed steel roll body both ends, refine to finished product.The present invention solves the problems, such as that existing high-speed steel roll centre bore decarburization position produces micro-crack in use, extends the normal service life of roll, it is thus also avoided that centre bore margin reserves problem, improve processing efficiency, reduce manufacturing cost and use cost.
Description
Technical field
The invention belongs to high-speed steel roll technical field, and in particular to a kind of cold rolling high strength car sheet specialized high-speed steel combination
Roller and its manufacture method.
Background technology
In order to tackle increasingly strict environmental protection challenge, world car industry has been taken active action, and Devoting Major Efforts To Developing is high-strength
Steel.High-strength steel typically refers to steel of the yield strength in more than 210MPa, and wherein yield strength is also known as super more than 550MPa
High-strength steel.High-strength steel and super-high strength steel are the Hyundai Motor manufactures that both can guarantee that automotive light weight technology, and can lifting vehicle safety
Material, with the sustainable growth of car ownership, the demand of high-strength steel is also in be substantially increased trend.
Relative to common iron, alloying element species in high-strength steel is more, content is high, and resistance of deformation is big in the operation of rolling,
Therefore its combination property to roll requires also higher, usually requires that integral hardness >=64HRC of roll, and with higher resistance to
Mill property and well anti-accident.And Cr12MoVCo, D2 and X63CrMoV51 conventionally used for multi-roll mill working roll at present
It has been difficult to the rolling working condition requirement for meeting high-strength steel and super-high strength steel etc. material.And high-speed steel is due to higher hardness and by force
Degree, it is the preferable material at present suitable for rolling high-strength steel and super-high strength steel.
But for high-speed steel, because its phosphorus content is high and contains the alloying elements such as more Mo, W, V, in order to meet
The technical requirements of its roll, Technology for Heating Processing are needed using salt bath furnace grade quench or the sub- warm oil quenching of special atmosphere oven.However,
Both approaches can be different degrees of appearance roll deformation and the problem of serious decarburization, especially large-scale high-speed steel roll is asked
Inscribe even more serious.Further, since high-speed steel roll matrix hardness is high, centre bore allowance is excessive, processing difficulties, surplus mistake
It is few, decarburized layer can not be removed completely, and these allowance for resulting in centre bore are difficult to control, and puzzlement is brought to production；Together
When, because high speed carbon content of steel is high, cause the decarburized layer for quenching rear center's hole portion position thicker, decarburized layer is in finishing process
In can not such as remove completely clean, micro-crack is easily produced during coping roller and use, can not such as be found in time, crackle
It can constantly extend, cause high-speed steel roll cracking to scrap, huge economic damage is all caused to high-speed steel roll manufactory and steel mill
Lose.
The content of the invention
It is an object of the invention to solve, high-speed steel roll centre bore position decarburized layer existing for prior art is blocked up, easy production
The problem of raw micro-crack, there is provided a kind of cold rolling high strength car sheet specialized high-speed steel combination roller and its manufacture method.
Realizing the technical scheme of the object of the invention is：A kind of cold rolling high strength car sheet specialized high-speed steel combines roller, it be by
Do not set centre bore high-speed steel roll body and interference fit installed in high-speed steel roll body both ends low-carbon steel rider set group into；It is described low
Carbon steel roller is put provided with centre bore.
The chemical composition and percentage by weight of the high-speed steel roll body are as follows：Carbon 0.70~1.20%；Silicon 0.20~0.80%；
Manganese 0.10~0.80%；Chromium 3.50~6.00%；Molybdenum 4.00~7.00%；Vanadium 1.50~3.00%；Tungsten 5.30~8.00%；Phosphorus≤
0.030%；Sulphur≤0.030%；Remaining is iron and inevitable impurity.
The chemical composition and percentage by weight of the high-speed steel roll body are preferably as follows：Carbon 0.80~0.90%；Silicon 0.20~
0.45%；Manganese 0.20~0.40%；Chromium 3.55~3.70%；Molybdenum 4.25~4.40%；Vanadium 1.50~1.70%；Tungsten 5.30~5.45%；
Phosphorus≤0.030%；Sulphur≤0.030%；Remaining is iron and inevitable impurity.
Integral hardness >=64HRC of the high-speed steel roll body.
The chemical composition and percentage by weight of the low-carbon steel rider set are as follows：Carbon 0.30~1.50%；Silicon 0.80~2.50%；
Manganese 0.20~1.00%；Chromium 4.50~7.00%；Molybdenum 1.00~2.50%；Vanadium 0.20~2.00%；Tungsten≤2.00%；Phosphorus≤0.020%；
Sulphur≤0.015%；Remaining is iron and inevitable impurity.
The chemical composition and percentage by weight of the low-carbon steel rider set are preferably as follows：Carbon 0.48~0.55%；Silicon 0.80~
1.20%；Manganese 0.20~0.50%；Chromium 4.80~5.50%；Molybdenum 1.00~1.50%；Vanadium 0.30~0.60%；Tungsten 1.00~1.50%；
Phosphorus≤0.020%；Sulphur≤0.015%；Remaining is iron and inevitable impurity.
The end hardness of the low-carbon steel rider set is 58~62HRC.
The length of low-carbon steel rider set for high-speed steel roll body roll neck length a quarter to half, preferably eight points
Three.
The manufacture method of above-mentioned cold rolling high strength car sheet specialized high-speed steel combination roller, has steps of：1. manufacture is at a high speed
Steel rider body：Including according to chemical composition and percentage by weight manufacture roll body base, machining center hole, Quenching Treatment, half fine grinding and
Remove centre bore；2. manufacture low-carbon steel rider set：Including according to chemical composition and percentage by weight manufacture roller set base, machining center
Hole, modifier treatment, Quenching Treatment and rebuilding centre bore；The Quenching Treatment is that two pairs of rollers cover the 60 ° of conical surfaces in base end face and centre bore
Carry out salt bath furnace grade quench；3. the high-speed steel roll body both ends 1. manufactured to step carry out turning, step is formed；By step 2.
The low-carbon steel rider set interference fit of manufacture is on the step at high-speed steel roll body both ends；Rise the mild steel at fast steel rider body both ends
The centre bore that roller is put is refined to finished product.
Integral hardness >=64HRC of 1. high-speed steel roll body that above-mentioned steps manufacture.
Roller set hardness of the above-mentioned steps 2. after modifier treatment is 40~50HSD.
The end hardness of 2. low-carbon steel rider set that above-mentioned steps manufacture is 58~62HRC.
The good effect that the present invention has：（1）One aspect of the present invention, as roll body, so passes through heat treatment using high-speed steel
Technique can meet the rolling working condition requirement of high-strength steel and super-high strength steel；On the other hand there is no centre bore on the high-speed steel roll body,
But the low-carbon steel rider set of centre bore is carried in roll body both ends interference fit, it can so avoid significantly caused by Technology for Heating Processing
Influence of the decarburized layer to center hole portion position, thoroughly solves the quality that centre bore decarburization position produces micro-crack in use
Problem, the normal service life of roll is extended, avoid the cracking loss from spoilage of high-speed steel roll and related parasitic losses, together
When can also avoid centre bore margin reserves problem, solve because high-speed steel roll matrix hardness is high and centre bore allowance
The processing difficulties excessively brought, processing efficiency is improved, finally greatly reduces manufacturing cost and use cost.（2）The present invention will be low
The end hardness of carbon steel roller set controls the hardness in 58~62HRC, being allowed to significantly lower than high-speed steel roll body >=64HRC, so big
Reduce abrasion of the roll both ends of the surface to bearing greatly, improve the service life of bearing.
Brief description of the drawings
Fig. 1 is that the cold rolling high strength car sheet specialized high-speed steel of the present invention combines the structural representation of roller.
Fig. 2 is that the low-carbon steel rider of the present invention covers the schematic diagram of the 60 ° of conical surfaces in end face and centre bore.
Embodiment
（Embodiment 1）
See Fig. 1, the cold rolling high strength car sheet specialized high-speed steel combination roller of the present embodiment is the high-speed steel roll body 1 by not setting centre bore
And interference fit is installed in high-speed steel roll body both ends and the set of the low-carbon steel rider provided with centre bore 2-1 2 forms.
The chemical composition and percentage by weight of the high-speed steel roll body are as follows：Carbon 0.85%；Silicon 0.30%；Manganese 0.30%；Chromium
3.6%；Molybdenum 4.30%；Vanadium 1.60%；Tungsten 5.40%；Phosphorus≤0.030%；Sulphur≤0.030%；Remaining is iron and inevitable impurity.
The integral hardness of the high-speed steel roll body is 65.8HRC.
The chemical composition and percentage by weight of low-carbon steel rider set are as follows：Carbon 0.52%；Silicon 0.95%；Manganese 0.35%；Chromium
5.15%；Molybdenum 1.30%；Vanadium 0.45%；Tungsten 1.30%；Phosphorus≤0.020%；Sulphur≤0.015%；Remaining is iron and inevitable impurity.
The end hardness of low-carbon steel rider set is 60.5HRC.
The length of low-carbon steel rider set is 3/8ths of high-speed steel roll body roll neck length.
The manufacture method of the cold rolling high strength car sheet specialized high-speed steel combination roller of the present embodiment has steps of：
1. manufacture high-speed steel roll body：Including manufacturing roll body base, machining center hole according to above-mentioned chemical composition and percentage by weight, quenching
Fire processing, half fine grinding and wire cutting remove centre bore.
Wherein, hardening heat is 1200~1220 DEG C, and temperature is 540~560 DEG C.
The integral hardness of the high-speed steel roll body is 65.8HRC.
2. manufacture low-carbon steel rider set：Including according to above-mentioned chemical composition and percentage by weight manufacture roller set base, machining center
Hole, modifier treatment, Quenching Treatment and rebuilding centre bore.
Wherein, modifier treatment temperature is 930~970 DEG C, and temperature is 620~670 DEG C.
Roller set hardness after modifier treatment is 46.3HSD.
Quenching Treatment is that two pairs of rollers cover the 60 ° of conical surfaces in base end face and centre bore（Referring to Fig. 2）Carry out salt bath furnace grade quench, quenching
Temperature is 1020~1060 DEG C, and temperature is 500~550 DEG C.
The end hardness of low-carbon steel rider set is 60.5HRC.
3. the high-speed steel roll body both ends 1. manufactured to step carry out turning, step is formed；2. low-carbon that step is manufactured
Steel rider set interference fit is on the step at high-speed steel roll body both ends；The low-carbon steel rider for rising fast steel rider body both ends is put
Refine to finished product in heart hole.
Claims (10)
1. a kind of cold rolling high strength car sheet specialized high-speed steel combines roller, it is characterised in that：It is the high-speed steel by not setting centre bore
Roll body and interference fit installed in high-speed steel roll body both ends low-carbon steel rider set group into；The low-carbon steel rider is put provided with center
Hole.
2. cold rolling high strength car sheet specialized high-speed steel according to claim 1 combines roller, it is characterised in that：The high-speed steel
The chemical composition and percentage by weight of roll body are as follows：Carbon 0.70~1.20%；Silicon 0.20~0.80%；Manganese 0.10~0.80%；Chromium
3.50~6.00%；Molybdenum 4.00~7.00%；Vanadium 1.50~3.00%；Tungsten 5.30~8.00%；Phosphorus≤0.030%；Sulphur≤0.030%；
Remaining is iron and inevitable impurity.
3. cold rolling high strength car sheet specialized high-speed steel according to claim 2 combines roller, it is characterised in that：The high-speed steel
The chemical composition and percentage by weight of roll body are as follows：Carbon 0.80~0.90%；Silicon 0.20~0.45%；Manganese 0.20~0.40%；Chromium
3.55~3.70%；Molybdenum 4.25~4.40%；Vanadium 1.50~1.70%；Tungsten 5.30~5.45%；Phosphorus≤0.030%；Sulphur≤0.030%；
Remaining is iron and inevitable impurity.
4. cold rolling high strength car sheet specialized high-speed steel according to claim 1 combines roller, it is characterised in that：The mild steel
The chemical composition and percentage by weight of roller set are as follows：Carbon 0.30~1.50%；Silicon 0.80~2.50%；Manganese 0.20~1.00%；Chromium
4.50~7.00%；Molybdenum 1.00~2.50%；Vanadium 0.20~2.00%；Tungsten≤2.00%；Phosphorus≤0.020%；Sulphur≤0.015%；Remaining
For iron and inevitable impurity.
5. cold rolling high strength car sheet specialized high-speed steel according to claim 1 combines roller, it is characterised in that：The mild steel
The chemical composition and percentage by weight of roller set are as follows：Carbon 0.48~0.55%；Silicon 0.80~1.20%；Manganese 0.20~0.50%；Chromium
4.80~5.50%；Molybdenum 1.00~1.50%；Vanadium 0.30~0.60%；Tungsten 1.00~1.50%；Phosphorus≤0.020%；Sulphur≤0.015%；
Remaining is iron and inevitable impurity.
6. the cold rolling high strength car sheet specialized high-speed steel combination roller according to one of claim 1 to 5, it is characterised in that：Institute
It is a quarter of high-speed steel roll body roll neck length to half to state the length of low-carbon steel rider set.
7. the manufacture method of the cold rolling high strength car sheet specialized high-speed steel combination roller described in one of claim 1 to 5, has following
Step：
1. manufacture high-speed steel roll body：Including manufacturing roll body base, machining center hole, at quenching according to chemical composition and percentage by weight
Centre bore is refined and removed to reason, half；
2. manufacture low-carbon steel rider set：Including according to chemical composition and percentage by weight manufacture roller set base, machining center hole, quenched place
Reason, Quenching Treatment and rebuilding centre bore；
The Quenching Treatment is that two pairs of rollers cover the 60 ° of conical surfaces progress salt bath furnace grade quenches in base end face and centre bore；
3. the high-speed steel roll body both ends 1. manufactured to step carry out turning, step is formed；2. low-carbon steel rider that step is manufactured
Set interference fit is on the step at high-speed steel roll body both ends；Rise the centre bore that the low-carbon steel rider at fast steel rider body both ends is put
Refine to finished product.
8. the manufacture method of cold rolling high strength car sheet specialized high-speed steel combination roller according to claim 7, it is characterised in that：
Integral hardness >=64HRC of 1. high-speed steel roll body that above-mentioned steps manufacture.
9. the manufacture method of cold rolling high strength car sheet specialized high-speed steel combination roller according to claim 7, it is characterised in that：
Roller set hardness of the above-mentioned steps 2. after modifier treatment is 40~50HSD.
10. the manufacture method of cold rolling high strength car sheet specialized high-speed steel combination roller according to claim 7, its feature exist
In：The end hardness of 2. low-carbon steel rider set that above-mentioned steps manufacture is 58~62HRC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710833456.XA CN107790498B (en) | 2017-09-15 | 2017-09-15 | Special high-speed steel combined roller for cold-rolled high-strength automobile plate and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710833456.XA CN107790498B (en) | 2017-09-15 | 2017-09-15 | Special high-speed steel combined roller for cold-rolled high-strength automobile plate and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107790498A true CN107790498A (en) | 2018-03-13 |
| CN107790498B CN107790498B (en) | 2020-06-16 |
Family
ID=61532346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710833456.XA Active CN107790498B (en) | 2017-09-15 | 2017-09-15 | Special high-speed steel combined roller for cold-rolled high-strength automobile plate and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107790498B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112621111A (en) * | 2020-11-16 | 2021-04-09 | 中国航发西安动力控制科技有限公司 | Method for processing large-diameter conical core rod with hole |
| CN112872041A (en) * | 2020-12-24 | 2021-06-01 | 东台市宏凯不锈钢有限公司 | Manganese alloy roller and manufacturing method thereof |
| CN114210734A (en) * | 2021-11-05 | 2022-03-22 | 宝钢轧辊科技有限责任公司 | High-speed steel combined roller and manufacturing method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1263805A (en) * | 1999-03-06 | 2000-08-23 | 饶云福 | Cold-rolling roller made up of more material segments by electroslag casting |
| JP2003039106A (en) * | 2001-07-27 | 2003-02-12 | Nippon Steel Corp | Method for manufacturing compound workroll for cold rolling and workroll |
| CN103614653A (en) * | 2013-12-02 | 2014-03-05 | 湖州市银鑫轧辊有限公司 | Method for manufacturing mill roll |
| CN106435370A (en) * | 2016-10-13 | 2017-02-22 | 宝钢轧辊科技有限责任公司 | High-speed steel roller special for cold-rolled high-strength car plate and manufacturing method thereof |
-
2017
- 2017-09-15 CN CN201710833456.XA patent/CN107790498B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1263805A (en) * | 1999-03-06 | 2000-08-23 | 饶云福 | Cold-rolling roller made up of more material segments by electroslag casting |
| JP2003039106A (en) * | 2001-07-27 | 2003-02-12 | Nippon Steel Corp | Method for manufacturing compound workroll for cold rolling and workroll |
| CN103614653A (en) * | 2013-12-02 | 2014-03-05 | 湖州市银鑫轧辊有限公司 | Method for manufacturing mill roll |
| CN106435370A (en) * | 2016-10-13 | 2017-02-22 | 宝钢轧辊科技有限责任公司 | High-speed steel roller special for cold-rolled high-strength car plate and manufacturing method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112621111A (en) * | 2020-11-16 | 2021-04-09 | 中国航发西安动力控制科技有限公司 | Method for processing large-diameter conical core rod with hole |
| CN112621111B (en) * | 2020-11-16 | 2023-09-01 | 中国航发西安动力控制科技有限公司 | Processing method of large-diameter conical core rod with holes |
| CN112872041A (en) * | 2020-12-24 | 2021-06-01 | 东台市宏凯不锈钢有限公司 | Manganese alloy roller and manufacturing method thereof |
| CN114210734A (en) * | 2021-11-05 | 2022-03-22 | 宝钢轧辊科技有限责任公司 | High-speed steel combined roller and manufacturing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107790498B (en) | 2020-06-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104233073B (en) | Steel rail with surface decarburized layer smaller than 0.3mm | |
| CN105239012B (en) | Semi high speed steel cold-rolling working roll and manufacturing method with highly resistance accident performance | |
| CN101956145B (en) | Semi high speed steel cold-rolling intermediate roll and manufacturing method thereof | |
| CN103350110B (en) | Method for manufacturing austenitic stainless steel band with smooth and bright surface | |
| CN104087836B (en) | Vanadium Cr microalloying ultra-fine pearlite rail | |
| CN107790498A (en) | Cold rolling high strength car sheet specialized high-speed steel combines roller and its manufacture method | |
| CN104120341A (en) | Cr5 steel forging work roll for rolling extremely thin materials and preparation method thereof | |
| CN110656294A (en) | Working roll special for tin-plating finisher and manufacturing method thereof | |
| CN104018082A (en) | Medium-carbon low-alloy wheel steel for metro and manufacturing method of wheel steel | |
| CN103438088B (en) | marine engine nodular cast iron crankshaft | |
| CN106435370B (en) | Cold rolling high strength car sheet specialized high-speed steel roll and its manufacturing method | |
| CN101818236B (en) | Method for manufacturing high carbon steel wheel | |
| CN114990447A (en) | Alloy material, hole expanding die and processing technology | |
| WO2022166155A1 (en) | Container crane wheel steel, wheel and preparation method therefor | |
| CN104120342A (en) | Roll and preparation method thereof | |
| CN114134399A (en) | Energy-saving steel wire rod with high bainite content for high alloy tool and manufacturing method thereof | |
| CN102618710A (en) | Method for reconstructing scrapped cold roll into qualified cold roll | |
| CN110777236B (en) | Method for machining opening end cover of automobile saddle through induction hardening of inner ring surface | |
| CN107760849B (en) | Quenching method of large-specification working roll of high-alloy cold-work die steel | |
| CN203500267U (en) | Nodular cast iron crankshaft for marine engine | |
| CN111876682A (en) | High-strength non-quenched and tempered steel connecting rod for heavy-duty automobile and manufacturing method thereof | |
| CN104561497A (en) | Turnout rail manufacturing method | |
| CN109333010A (en) | A kind of forging method of metallurgy mine tram wheel | |
| CN104099519B (en) | A kind of heatproof red needle and preparation method thereof | |
| CN114318138B (en) | High-hardness large-scale pole piece roller material and pole piece roller preparation method |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |