CN104372144A - Heat treatment method - Google Patents
Heat treatment method Download PDFInfo
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- CN104372144A CN104372144A CN201410224821.3A CN201410224821A CN104372144A CN 104372144 A CN104372144 A CN 104372144A CN 201410224821 A CN201410224821 A CN 201410224821A CN 104372144 A CN104372144 A CN 104372144A
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Abstract
A related heat treatment method is characterized in that heat treatment is performed on a medium/high-carbon steel continuous cast slab and a medium/high-carbon alloy steel continuous cast slab. The medium/high-carbon steel continuous cast slab comprises, in percent by mass, 0.25-1.35% of C, 0.10-0.37% of Si, 0.25-0.80% of Mn, P <=0.035%, and S <=0.030%. The medium/high-carbon alloy steel continuous cast slab comprises, in percent by mass, 0.25-1.50% of C, 0.10-2.10% of Si, 0.30-2.60% of Mn, P <=0.035%, S <=0.035%, Cr <=4.50%, V <=1.20%, Mo <=1.20%, Ni <=4.60%, and B <=0.004%. The heat treatment steps comprise that the temperature of the slab entering a heat treatment furnace is 150 DEG C-850 DEG C, the slab heat-treatment warm-keeping temperature is 300-850 DEG C, the slab heat-treatment warm-keeping time is 3-40 hours, the temperature of the slab exhausted from the furnace after being subjected to heat treatment is 150-550 DEG C, the slab heat-treatment heating speed is 5-250 DEG C/h, and the slab heat-treatment cooling speed is 5-100 DEG C/h. The continuous cast slabs subjected to heat treatment does not have crack defects.
Description
Technical field
The present invention relates to a kind of heat treating method.
Technical background
Existing heat treating method as the defect eliminating mo(u)lded piece and forging parts for the production of in.Heat treating method for medium high carbon element steel continuous casting and medium high carbon alloy steel continuous casting is not also shown in relevant report.
Carbon steel mainly refers to that mechanical property depends on the carbon content in steel.Carbon steel can be divided into soft steel (W by carbon content
c≤ 0.25%), medium carbon steel (W
c: 0.25%-0.6%) and high carbon steel (W
c>=0.6%).
In general carbon steel, the higher then hardness of carbon content is higher, and intensity is also higher, but plasticity is lower.The carbon content of high carbon steel, from 0.60% to 1.70%, can be hardened and tempering.The intensity of general high carbon steel is very high, be commonly used to need hardness requirement high environment in the middle of.
The carbon content 0.25% ~ 0.60% of medium carbon steel, hot-work and cutting ability good.Intensity, hardness ratio soft steel are high, and plasticity and toughness are lower than soft steel.Without thermal treatment, directly can use, also can after heat treatment use.Medium carbon steel after quenching, tempering has good comprehensive mechanical property.In the various uses of medium tenacity level, medium carbon steel obtains applying the most widely, except as except material of construction, also a large amount of for the manufacture of various mechanical component.
Medium high carbon element steel continuous casting and medium high carbon alloy steel continuous casting produce difficulty, because slab exists stress, directly let cool, and slab is inner, outer surface all easily cracks; When reheating rolling, base accident of breaking in stove may be caused in heat-processed; Easily edge fault is caused in the operation of rolling.For eliminating the generation of inside and outside defect, as an important step, be necessary to take corresponding way.
Summary of the invention
In order to overcome the above-mentioned deficiency of existing heat treating method, the invention provides a kind of heat treating method eliminating the medium high carbon element steel continuous casting steel billet of slab crack defect, the continuous casting steel billet after present method thermal treatment meets the demand using medium high carbon element steel continuous casting steel billet to produce hot rolled strip.
Another object of the present invention is to provide a kind of heat treating method eliminating the alloy steel continuous casting slab of slab crack defect, and the continuous casting steel billet after present method thermal treatment meets the demand using medium high carbon alloy steel continuous casting steel billet to produce hot rolled strip.
The continuous casting steel billet of above-mentioned two differing materials is heat treated by a kind of method.
The chemical composition mass percent of heat treated medium high carbon element steel continuous casting steel billet of the present invention is:
C：0.25-1.35； Si：0.10-0.37； Mn：0.25-0.80；
P：≤0.035； S：≤0.030；
Surplus is Fe and inevitable impurity element.
The process of the heat treating method of medium high carbon element steel continuous casting steel billet of the present invention is:
Slab enters temperature before heat treatment furnace: 150 DEG C-850 DEG C;
Slab thermal treatment holding temperature: 300-850 DEG C;
Slab thermal treatment soaking time: 3-40 hours;
Slab thermal treatment come out of the stove before temperature: 150-550 DEG C;
Slab thermal treatment heat-up rate: 5-250 DEG C/h;
Slab thermal treatment cooling rate: 5-100 DEG C/h.
The chemical composition mass percent of heat treated medium high carbon element alloy steel continuous casting steel billet of the present invention is:
C：0.25-1.50； Si：0.10-2.10； Mn：0.30-2.60；
P：≤0.035； S：≤0.035； Cr：≤4.50； V：≤1.20；
Mo：≤1.20； Ni：≤4.60； B：≤0.004；
When Mn is not more than 1.0%, wherein Cr, V, Mo, Ni and B five kinds of elements can not be zero simultaneously.Surplus is Fe and inevitable impurity element.
The process of the heat treating method of medium high carbon alloy steel continuous casting steel billet of the present invention is:
Slab enters temperature: 150-850 DEG C before heat treatment furnace;
Slab thermal treatment holding temperature: 300-850 DEG C;
Slab thermal treatment soaking time: 3-40 hours;
Slab thermal treatment come out of the stove before temperature: 150-500 DEG C;
Slab thermal treatment heat-up rate: 5-250 DEG C/h;
Slab thermal treatment cooling rate: 5-100 DEG C/h.
The present invention is applicable to the slab that hot rolled strip that medium high carbon element steel or medium high carbon alloy steel adopt continuous casting mode to produce uses.Temperature, slab thermal treatment heat-up rate, slab heat place cooling rate before the present invention is come out of the stove by temperature, slab thermal treatment holding temperature, slab thermal treatment soaking time, slab thermal treatment before controlling slab and entering heat treatment furnace, eliminate slab internal stress, slab after thermal treatment does not have crack defect, meets the demand using medium high carbon element steel continuous casting steel billet or medium high carbon alloy steel continuous casting steel billet stably manufactured hot rolled strip.Strip excellent surface quality after hot rolling.
Embodiment
Below in conjunction with embodiment, the specific embodiment of the present invention is described further, but is of the present inventionly not limited to following embodiment.But should not limit protection scope of the present invention with this, all employings are equal to the technical scheme that replacement or equivalent transformation are formed, all drop within protection domain that the claims in the present invention define.
carbon steel embodiment one
The present embodiment is heat treated is medium high carbon element plate slab, and its chemical composition mass percent is:
C：1.10%； Si：0.30%； Mn ：0.40%；P：0.025%； S：0.021%；
Surplus is Fe and inevitable impurity element.
The long 11000mm of slab, wide 1250mm, thick 230mm.
The heat treatment process of the present embodiment is:
Slab enters temperature before heat treatment furnace: 600 DEG C;
Slab thermal treatment holding temperature: 740 DEG C;
Slab thermal treatment soaking time: 6 hours;
Slab thermal treatment come out of the stove before temperature: 250 DEG C;
Slab thermal treatment heat-up rate: 30 DEG C/h;
Slab thermal treatment cooling rate: 40 DEG C/h.
carbon steel embodiment two
The present embodiment is heat treated is medium high carbon element plate slab, and its chemical composition mass percent is:
C：0.85%； Si：0.30%； Mn ：0.37%；P：0.018%； S：0.012%；
Surplus is Fe and inevitable impurity element.
The long 11000mm of slab, wide 1250mm, thick 200mm.
The heat treatment process of the present embodiment is:
Slab enters temperature before heat treatment furnace: 550 DEG C;
Slab thermal treatment holding temperature: 720 DEG C;
Slab thermal treatment soaking time: 8 hours;
Slab thermal treatment come out of the stove before temperature: 300 DEG C;
Slab thermal treatment heat-up rate: 40 DEG C/h;
Slab thermal treatment cooling rate: 60 DEG C/h.
carbon steel embodiment three
The present embodiment is heat treated is medium high carbon element plate slab, and its chemical composition mass percent is:
C：0.65%； Si：0.22%； Mn ：0.35%；P：0.017%； S：0.013%；
Surplus is Fe and inevitable impurity element.
The long 11000mm of slab, wide 1450mm, thick 230mm.
The heat treatment process of the present embodiment is:
Slab enters temperature before heat treatment furnace: 300 DEG C;
Slab thermal treatment holding temperature: 500 DEG C;
Slab thermal treatment soaking time: 30 hours;
Slab thermal treatment come out of the stove before temperature: 200 DEG C;
Slab thermal treatment heat-up rate: 80 DEG C/h;
Slab thermal treatment cooling rate: 90 DEG C/h.
carbon steel embodiment four
The present embodiment is heat treated is medium high carbon element plate slab, and its chemical composition mass percent is:
C：0.50%； Si：0.32%； Mn ：0.70%；P：0.016%； S：0.014%；
Surplus is Fe and inevitable impurity element.
The long 10000mm of slab, wide 1550mm, thick 230mm.
The heat treatment process of the present embodiment is:
Slab enters temperature before heat treatment furnace: 350 DEG C;
Slab thermal treatment holding temperature: 450 DEG C;
Slab thermal treatment soaking time: 25 hours;
Slab thermal treatment come out of the stove before temperature: 250 DEG C;
Slab thermal treatment heat-up rate: 100 DEG C/h;
Slab thermal treatment cooling rate: 95 DEG C/h.
steel alloy embodiment one
The present embodiment is heat treated is medium high carbon alloy plate slab, and its chemical composition mass percent is:
C：0.95%； Si：0.22%； P：0.020%； S：0.015%； Mn：0.60%；
Cr：0.50%； V：0.35%。
Surplus is Fe and inevitable impurity element.
The long 11000mm of slab, wide 1450mm, thick 230mm.
The heat treatment process of the present embodiment is:
Slab enters temperature before heat treatment furnace: 500 DEG C;
Slab thermal treatment holding temperature: 730 DEG C;
Slab thermal treatment soaking time: 10 hours;
Slab thermal treatment come out of the stove before temperature: 350 DEG C;
Slab thermal treatment heat-up rate: 50 DEG C/h;
Slab thermal treatment cooling rate: 60 DEG C/h.
steel alloy embodiment two
The present embodiment is heat treated is medium high carbon alloy plate slab, and its chemical composition mass percent is:
C：0.72%； Si：0.17%；Mn：0.78%； P：0.020%； S：0.020%；
Cr：0.60%； Ni：0.25%；V：0.25%；
Surplus is Fe and inevitable impurity element.
The long 7800mm of slab, wide 1380mm, thick 200mm.
The heat treatment process of the present embodiment is:
Slab enters temperature before heat treatment furnace: 360 DEG C;
Slab thermal treatment holding temperature: 620 DEG C;
Slab thermal treatment soaking time: 28 hours;
Slab thermal treatment come out of the stove before temperature: 260 DEG C;
Slab thermal treatment heat-up rate: 70 DEG C/h;
Slab thermal treatment cooling rate: 70 DEG C/h.
steel alloy embodiment three
The present embodiment is heat treated is medium high carbon alloy plate slab, and its chemical composition mass percent is:
C：0.60%； Si：1.85%； Mn：0.80%；P：0.018%； S：0.010%；
Cr：0.32%； Ni：0.30%；
Surplus is Fe and inevitable impurity element.
The long 10000mm of slab, wide 1250mm, thick 200mm.
The heat treatment process of the present embodiment is:
Slab enters temperature before heat treatment furnace: 300 DEG C;
Slab thermal treatment holding temperature: 780 DEG C;
Slab thermal treatment soaking time: 9 hours;
Slab thermal treatment come out of the stove before temperature: 350 DEG C;
Slab thermal treatment heat-up rate: 85 DEG C/h;
Slab thermal treatment cooling rate: 50 DEG C/h.
steel alloy embodiment four
The present embodiment is heat treated is medium high carbon alloy plate slab, and its chemical composition mass percent is:
C：0.45%； Si：0.25%；Mn：1.10%； P：0.020%； S：0.020%；
Cr：0.20%； V：0.20%； B：0.0008%。
Surplus is Fe and inevitable impurity element.
The long 11000mm of slab, wide 1450mm, thick 230mm.
The heat treatment process of the present embodiment is:
Slab enters temperature before heat treatment furnace: 300 DEG C;
Slab thermal treatment holding temperature: 500 DEG C;
Slab thermal treatment soaking time: 25 hours;
Slab thermal treatment come out of the stove before temperature: 200 DEG C;
Slab thermal treatment heat-up rate: 85 DEG C/h;
Slab thermal treatment cooling rate: 35 DEG C/h.
steel alloy embodiment five
The present embodiment is heat treated is medium high carbon alloy plate slab, and its chemical composition mass percent is:
C： 0.31%； Si：0.25%；Mn：0.60%； P：0.017%； S：0.010%；
Cr：1.00% ； Mo：0.20%；
Surplus is Fe and inevitable impurity element.
The long 8000mm of slab, wide 2000mm, thick 200mm.
The heat treatment process of the present embodiment is:
Slab enters temperature before heat treatment furnace: 300 DEG C;
Slab thermal treatment holding temperature: 550 DEG C;
Slab thermal treatment soaking time: 20 hours;
Slab thermal treatment come out of the stove before temperature: 150 DEG C;
Slab thermal treatment heat-up rate: 60 DEG C/h;
Slab thermal treatment cooling rate: 30 DEG C/h.
Claims (2)
1. a heat treating method, is characterized in that: heat treated is medium high carbon element steel continuous casting steel billet, and the chemical composition mass percent of medium high carbon element steel continuous casting steel billet is:
C：0.25-1.35； Si：0.10-0.37； Mn：0.25-0.80；
P：≤0.035； S：≤0.030；
Surplus is Fe and inevitable impurity element;
The step of the heat treating method of medium high carbon element steel continuous casting steel billet is:
Slab enters temperature before heat treatment furnace: 150 DEG C-850 DEG C;
Slab thermal treatment holding temperature: 300-850 DEG C;
Slab thermal treatment soaking time: 3-40 hours;
Slab thermal treatment come out of the stove before temperature: 150-550 DEG C;
Slab thermal treatment heat-up rate: 5-250 DEG C/h;
Slab thermal treatment cooling rate: 5-100 DEG C/h.
2. a heat treating method, is characterized in that: the medium high carbon element alloy steel continuous casting steel billet of process, and the chemical composition mass percent of medium high carbon element alloy steel continuous casting steel billet is:
C：0.25-1.50； Si：0.10-2.10； Mn：0.30-2.60；
P：≤0.035； S：≤0.035； Cr：≤4.50； V：≤1.20；
Mo：≤1.20； Ni：≤4.60； B：≤0.004；
When Mn is not more than 1.0%, wherein Cr, V, Mo, Ni and B five kinds of elements can not be zero simultaneously, and surplus is Fe and inevitable impurity element;
The step of the heat treating method of medium high carbon alloy steel continuous casting steel billet is:
Slab enters temperature: 150-850 DEG C before heat treatment furnace;
Slab thermal treatment holding temperature: 300-850 DEG C;
Slab thermal treatment soaking time: 3-40 hours;
Slab thermal treatment come out of the stove before temperature: 150-500 DEG C;
Slab thermal treatment heat-up rate: 5-250 DEG C/h;
Slab thermal treatment cooling rate: 5-100 DEG C/h.
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| CN201410224821.3A CN104372144A (en) | 2014-05-27 | 2014-05-27 | Heat treatment method |
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|---|---|---|---|
| CN201410224821.3A CN104372144A (en) | 2014-05-27 | 2014-05-27 | Heat treatment method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105239022A (en) * | 2015-09-29 | 2016-01-13 | 高鹏 | Preparation method for alloy forged steel rollers |
| CN106834962A (en) * | 2017-03-29 | 2017-06-13 | 沈阳工业大学 | A kind of strong high-carbon low-alloy steel of superelevation and its shaping and heat-treatment technology method |
| CN106884076A (en) * | 2015-12-16 | 2017-06-23 | 常熟宝升精冲材料有限公司 | A kind of destressing tempering method of SPCC-1B materials |
| CN109339545A (en) * | 2018-11-28 | 2019-02-15 | 上海材料研究所 | Buckling-restrained energy-dissipation |
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| JPS61281822A (en) * | 1986-05-27 | 1986-12-12 | Daido Steel Co Ltd | Production of pipe for pneumatically transporting earth and sand |
| CN1490426A (en) * | 2002-10-16 | 2004-04-21 | 天津航道勘察设计研究院 | Abrasion resistant casting alloy for dredging tool and preparing method thereof |
| CN101716660A (en) * | 2009-11-28 | 2010-06-02 | 山西太钢不锈钢股份有限公司 | Continuous casting method of heat-resistance stainless steel for steam turbine blade |
| CN102303212A (en) * | 2011-06-24 | 2012-01-04 | 成都申信达机械有限公司 | Process for manufacturing lining board of wet-spraying machine |
| CN102758144A (en) * | 2011-04-28 | 2012-10-31 | 宝山钢铁股份有限公司 | Production method for steel ingot of large-sized high-nitrogen retaining ring steel |
| CN103173682A (en) * | 2013-04-02 | 2013-06-26 | 山西太钢不锈钢股份有限公司 | Hot rolled strip for conveying concrete and manufacturing method thereof |
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2014
- 2014-05-27 CN CN201410224821.3A patent/CN104372144A/en active Pending
Patent Citations (6)
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|---|---|---|---|---|
| JPS61281822A (en) * | 1986-05-27 | 1986-12-12 | Daido Steel Co Ltd | Production of pipe for pneumatically transporting earth and sand |
| CN1490426A (en) * | 2002-10-16 | 2004-04-21 | 天津航道勘察设计研究院 | Abrasion resistant casting alloy for dredging tool and preparing method thereof |
| CN101716660A (en) * | 2009-11-28 | 2010-06-02 | 山西太钢不锈钢股份有限公司 | Continuous casting method of heat-resistance stainless steel for steam turbine blade |
| CN102758144A (en) * | 2011-04-28 | 2012-10-31 | 宝山钢铁股份有限公司 | Production method for steel ingot of large-sized high-nitrogen retaining ring steel |
| CN102303212A (en) * | 2011-06-24 | 2012-01-04 | 成都申信达机械有限公司 | Process for manufacturing lining board of wet-spraying machine |
| CN103173682A (en) * | 2013-04-02 | 2013-06-26 | 山西太钢不锈钢股份有限公司 | Hot rolled strip for conveying concrete and manufacturing method thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105239022A (en) * | 2015-09-29 | 2016-01-13 | 高鹏 | Preparation method for alloy forged steel rollers |
| CN106884076A (en) * | 2015-12-16 | 2017-06-23 | 常熟宝升精冲材料有限公司 | A kind of destressing tempering method of SPCC-1B materials |
| CN106834962A (en) * | 2017-03-29 | 2017-06-13 | 沈阳工业大学 | A kind of strong high-carbon low-alloy steel of superelevation and its shaping and heat-treatment technology method |
| CN106834962B (en) * | 2017-03-29 | 2018-07-06 | 沈阳工业大学 | A kind of strong high-carbon low-alloy steel of superelevation and its forming and heat-treatment technology method |
| CN109339545A (en) * | 2018-11-28 | 2019-02-15 | 上海材料研究所 | Buckling-restrained energy-dissipation |
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