CN102534389A - Chromium-molybdenum steel lining board for mills and production technique thereof - Google Patents
Chromium-molybdenum steel lining board for mills and production technique thereof Download PDFInfo
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- CN102534389A CN102534389A CN2012100460805A CN201210046080A CN102534389A CN 102534389 A CN102534389 A CN 102534389A CN 2012100460805 A CN2012100460805 A CN 2012100460805A CN 201210046080 A CN201210046080 A CN 201210046080A CN 102534389 A CN102534389 A CN 102534389A
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Abstract
The invention discloses a chromium-molybdenum steel lining board for mills, which comprises 0.65-0.75% of C, 0.30-0.65% of Si, 0.55-1.00% of Mn, 1.80-2.50% of Cr, 0.25-0.30% of Mo, at most 0.03% of S, at most 0.03% of P and the balance of Fe. An intermediate-frequency furnace is used for smelting, wherein the smelting temperature is 1530 DEG C, and the pouring temperature is kept at 1490 DEG C. The lining board casting is held at 890 DEG C for 2.5 hours, and subjected to quenching treatment (oil quenching); and the tempering temperature is 600 DEG C, and the tempering time is 2.5 hours. The cast steel is used for manufacturing lining boards of large-size semi-autogenous mills and autogenous mills, and has the characteristics of high strength, high toughness, high wear resistance and the like.
Description
Technical field
The present invention relates to a kind of large-scale Semi-Autogenous, autogenous mill, ball mill, especially a kind of grinding machine chrome-molybdenum steel liner plate and production technique thereof.
Background technology
The metal backing life-span of ball mill employing at present is shorter, and shock resistance characteristic and wear-resistant property need further to improve simultaneously.Along with domestic and international market autogenous mill (semi-autogenous mill) is tending towards maximizing, high-performance, high-level efficiency, high-quality grinding machine product constantly increase.Used hardness inhomogeneous, the manganese steel of poor toughness and middle low-carbon alloy steel lining board of grinder are difficult to satisfy request for utilization (tensile strength, ys, relative reduction in area, hardness and elongation) in the past.Large-sized grinder is increasingly high to the use properties requirement of abrasion-proof backing block, not only high wear resistance will be arranged, and higher yield strength, relative reduction in area, elongation will be arranged.Therefore develop a kind of existing high wear resistance and high obdurability, and production cost is low, lining board of grinder simple for process replaces traditional manganese steel and medium carbon low alloy steel lining board of grinder imperative.
Summary of the invention
Technical problem to be solved by this invention provides the working method of large-scale half grinding machine, autogenous mill liner plate and this grinding machine chrome-molybdenum steel liner plate thereof of a kind of existing high wear resistance and high obdurability.
The technical scheme that the present invention solves its technical problem is:
Grinding machine chrome-molybdenum steel liner plate, its composition is: C0.65～0.75, Si0.30～0.65, Mn0.55～1.00, Cr1.80～2.50, Mo0.25～0.30, S≤0.03, P≤0.03, surplus are Fe.
The production technique of grinding machine chrome-molybdenum steel liner plate comprises batching step, melting step and cast step, and lining board of grinder production process smelting temperature is 1530 ℃, and teeming temperature is 1490 ℃.
Also comprise heat treatment step, the thermal treatment process of lining board of grinder does, at first the lining board of grinder foundry goods is warming up to 890 ℃, carries out quench treatment behind the insulation 2.5h, temper then, and tempering temperature is 600 ℃, the temper time is 2. 5h.
Described quench treatment is an oil quenching.
Cr is the alloying constituent of using always, can solid solution plays the effect of solution strengthening in ferritic, can form multiple alloy carbide with the carbide of steel again.Cr is not the superheated susceptivity element, along with Cr content increases, and intensity, plasticity, toughness increases.The add-on of Cr increases, and the thermal treatment difficulty that will become under the high situation of carbon content particularly is so the content of Cr is lower than 2.5%.
Mn in iron, form contain the manganese cementite (Fe, Mn)
3C can enlarge the austenite phase region, significantly improves the hardening capacity of steel, can also reduce the carbon content of eutectoid point, can suppress carbide separating out on the supercooled austenite crystal boundary, improves the microtexture after the thermal treatment.
Compared with prior art, low-carbon alloy steel ball grinding machine lining board shock resistance characteristic and wear-resistant property were strong during chrome-molybdenum steel liner plate of the present invention reached than traditional manganese steel, long service life.Tensile strength sigma b is 1220MPa, hardness 330-380 HB, and ys σ s1120MPa, unit elongation are 7.0%, relative reduction in area is 14%.
Embodiment
Grinding machine chrome-molybdenum steel liner plate, its composition is: C0.65～0.75, Si0.30～0.65, Mn0.55～1.00, Cr1.80～2.50, Mo0.25～0.30, S≤0.03, P≤0.03, surplus are Fe.
Grinding machine chrome-molybdenum steel liner plate adopts intermediate frequency furnace to smelt.For improving smelting quality, the defective when reducing casting, intensity, hardness and the toughness of raising high-abrasive material.The chrome-molybdenum steel lining board of grinder in process of production, smelting temperature adopts 1530 ℃, teeming temperature adopts 1490 ℃.
Through the tissue and the performance of material after the research different heat treatment technology, to optimize the toughness and tenacity of material.The thermal treatment process that the chrome-molybdenum steel liner plate adopts is:
(1) carries out quench treatment (oil quenching) behind 890 ℃ of insulations of liner plate foundry goods 2.5h.
(2) the temper temperature is 600 ℃, and the temper time is 2.5h.
Liner plate foundry goods tissue through after the thermal treatment is mainly tempered sorbite, does not have tangible martensite to exist, and crystal grain is tiny, organizes disperse, even, good mechanical properties.
Qualified chrome-molybdenum steel liner plate each item mechanical performance index is outstanding:
Tensile strength sigma b is 1220 MPa, hardness 330-380 HB, and ys σ s1120 MPa,
Unit elongation is 7.0%, and relative reduction in area is 14%.
Chromium-molybdenum liner plate steel can be used to the to cast liner plate of different shape, production process is simple relatively, and casting flexibility is stronger, is fit to large-scale commercial prodn.
Claims (4)
1. grinding machine chrome-molybdenum steel liner plate, it is characterized in that: its composition is: C0.65～0.75, Si0.30～0.65, Mn0.55～1.00, Cr1.80～2.50, Mo0.25～0.30, S≤0.03, P≤0.03, surplus are Fe.
2. the production technique of the described grinding machine chrome-molybdenum steel of claim 1 liner plate comprises batching step, melting step and cast step, and it is characterized in that: chrome-molybdenum steel liner plate production process smelting temperature is 1530 ℃, and teeming temperature is 1490 ℃.
3. the production technique of grinding machine chrome-molybdenum steel liner plate according to claim 2; It is characterized in that: also comprise heat treatment step, the thermal treatment process of chrome-molybdenum steel liner plate is at first chrome-molybdenum steel liner plate foundry goods to be warming up to 890 ℃; Carry out quench treatment behind the insulation 2.5h; Temper then, tempering temperature is 600 ℃, the temper time is 2. 5h.
4. the production technique of grinding machine chrome-molybdenum steel liner plate according to claim 3 is characterized in that: described quench treatment is an oil quenching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2012100460805A CN102534389A (en) | 2012-02-28 | 2012-02-28 | Chromium-molybdenum steel lining board for mills and production technique thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100460805A CN102534389A (en) | 2012-02-28 | 2012-02-28 | Chromium-molybdenum steel lining board for mills and production technique thereof |
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| CN102534389A true CN102534389A (en) | 2012-07-04 |
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| CN2012100460805A Pending CN102534389A (en) | 2012-02-28 | 2012-02-28 | Chromium-molybdenum steel lining board for mills and production technique thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104275233A (en) * | 2014-05-26 | 2015-01-14 | 宁国市鑫煌矿冶配件制造有限公司 | High-abrasion-resistance and high-hardness lining plate for ball grinder |
| CN104342602A (en) * | 2013-07-31 | 2015-02-11 | 丁年花 | Processing method of lining plate of medium-carbon alloy wear-resistant steel ball mill |
| CN108456827A (en) * | 2018-01-30 | 2018-08-28 | 舞阳钢铁有限责任公司 | A kind of modified adds vanadium chrome molybdenum steel plate and its production method |
| CN108722574A (en) * | 2017-09-27 | 2018-11-02 | 北京环磨科技有限公司 | A kind of easy through hardening autogenous tumbling mill and semi-autogenous mill liner plate |
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| JPH02240240A (en) * | 1989-03-10 | 1990-09-25 | Aisin Seiki Co Ltd | Diaphragm spring of clutch for automobile use |
| CN1417366A (en) * | 2001-11-05 | 2003-05-14 | 江苏省机电研究所 | Antiwear alloy steel containg RE, B and Cr and its prepn |
| CN101177766A (en) * | 2007-12-04 | 2008-05-14 | 刘少杰 | High-chromium alloy cast-iron concrete mixer lining board and method for manufacturing the same |
| CN101526046A (en) * | 2008-03-04 | 2009-09-09 | 日产自动车株式会社 | Piston ring |
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2012
- 2012-02-28 CN CN2012100460805A patent/CN102534389A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02240240A (en) * | 1989-03-10 | 1990-09-25 | Aisin Seiki Co Ltd | Diaphragm spring of clutch for automobile use |
| CN1417366A (en) * | 2001-11-05 | 2003-05-14 | 江苏省机电研究所 | Antiwear alloy steel containg RE, B and Cr and its prepn |
| CN101177766A (en) * | 2007-12-04 | 2008-05-14 | 刘少杰 | High-chromium alloy cast-iron concrete mixer lining board and method for manufacturing the same |
| CN101526046A (en) * | 2008-03-04 | 2009-09-09 | 日产自动车株式会社 | Piston ring |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104342602A (en) * | 2013-07-31 | 2015-02-11 | 丁年花 | Processing method of lining plate of medium-carbon alloy wear-resistant steel ball mill |
| CN104275233A (en) * | 2014-05-26 | 2015-01-14 | 宁国市鑫煌矿冶配件制造有限公司 | High-abrasion-resistance and high-hardness lining plate for ball grinder |
| CN104275233B (en) * | 2014-05-26 | 2016-06-22 | 宁国市鑫煌矿冶配件制造有限公司 | A kind of ball mill high abrasion high rigidity liner plate |
| CN108722574A (en) * | 2017-09-27 | 2018-11-02 | 北京环磨科技有限公司 | A kind of easy through hardening autogenous tumbling mill and semi-autogenous mill liner plate |
| CN108456827A (en) * | 2018-01-30 | 2018-08-28 | 舞阳钢铁有限责任公司 | A kind of modified adds vanadium chrome molybdenum steel plate and its production method |
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Application publication date: 20120704 |
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