CN114888115A - 一种热轧冷镦钢盘条的生产方法 - Google Patents
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 23
- 239000010959 steel Substances 0.000 title claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 238000005096 rolling process Methods 0.000 claims abstract description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 238000000227 grinding Methods 0.000 claims abstract description 12
- 238000009749 continuous casting Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 239000000126 substance Substances 0.000 claims abstract description 5
- 238000002791 soaking Methods 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 6
- 238000009987 spinning Methods 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 abstract description 5
- 238000000265 homogenisation Methods 0.000 abstract description 3
- 239000011572 manganese Substances 0.000 description 5
- 229910001566 austenite Inorganic materials 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 230000008520 organization Effects 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
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- 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
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- 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
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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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
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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Abstract
一种热轧冷镦钢盘条的生产方法,钢的化学成分组成重量百分比为C=0.43%~0.45%,Si=0.12%~0.20%,Mn=0.70%~0.80%,P≤0.020%,S≤0.010%,Al≥0.020%,其余为Fe和不可避免的杂质;关键工艺步骤包括(1)连铸;(2)矩形坯加热;(3)矩形坯开坯;(4)方坯修磨;(5)盘条轧制。本发明关键是控制冷镦钢盘条带状组织,实现盘条金相组织均匀化,带状组织控制在2.0级以内。
Description
技术领域
本发明属于冶金技术领域,涉及一种热轧冷镦钢盘条的生产方法。
背景技术
冷镦钢的生产发展非常迅速,变形量越来越大。不但对其表面质量要求高,还要求内部质量好,尤其是钢材的带状组织级别尽可能降低,因为带状组织可导致钢材力学性能各向异性,极大地降低钢的塑性和韧性,造成钢材变形大时开裂。为提高冷镦钢盘条的冷镦性能和质量,如何降低盘条带状组织成为急需解决的问题。
因此,对控制冷镦钢盘条带状组织的生产技术进行技术研究与开发具有重要意义。
发明内容
本发明的目的是提供一种冷镦钢盘条的生产方法。通过控制冷镦钢盘条带状组织,实现盘条金相组织均匀化,带状组织控制在2.0级以内。
本发明的技术方案:
一种冷镦钢盘条的生产方法,钢的化学成分组成重量百分比为C=0.43%~0.45%,Si=0.12%~0.20%,Mn=0.70%~0.80%,P≤0.020%,S≤0.010%,Al≥0.020%,其余为Fe和不可避免的杂质;包括以下工艺步骤:
(1)连铸:连铸采用大断面矩形坯350*430mm,并且采用结晶器电磁搅拌+末端重压下,结晶器电搅参数为250A、2.5HZ,总压下量≥20mm,矩形坯采用堆冷≥24h;
(2)矩形坯加热:350*430mm矩形坯开坯成150*150mm方坯,加热段1200~1250℃,均热段1200~1230℃,开轧温度1100~1150℃,在炉时间240~330min;
(3)矩形坯开坯:采用大压下量轧制,前2道单道压下量≥20%;
(4)方坯修磨:150*150mm方坯采用全修磨;
(5)盘条轧制:加热段1150~1200℃,均热段1100~1150℃,开轧温度1000~1050℃,在炉时间≥100min;吐丝温度800℃~850℃。
本发明的有益效果,采用大断面矩形坯,配备采用结晶器电磁搅拌+末端重压下,破碎柱状晶,降低中心偏析。高的钢坯加热温度并延长加热时间,使形成枝晶偏析的元素(如Mn等)、残余碳化物扩散均匀,达到理想的奥氏体均匀化,同时使奥氏体的晶粒尺寸超过原始带状的条带宽度,以减轻原始带状。采用大压下量轧制增加变形渗透,使轧材内部组织更加致密、更加均匀。采用方坯修磨去除表面缺陷和脱碳层,利用二火进一步使枝晶偏析、残余碳化物扩散,适当降低终轧温度(以接近Ac3为宜),细化奥氏体晶粒,以达到细化铁素体晶粒,从而加大其与富锰带间距之间的差别,减轻带状组织。
附图说明
图1为实施例1盘条组织图。
图2为实施例2盘条组织图。
具体实施方式
下面结合实施例对本发明内容作进一步说明。
实施例按350*430mm矩形坯—加热—开坯—修磨—轧制—吐丝等工艺流程进行生产。
实施例1:
一种热轧冷镦钢盘条的生产方法,轧制规格Φ16mm。
钢的化学成分组成重量百分比为:C=0.45%,Si=0.17%,Mn=0.74%,P=0.015%,S=0.007%,Al=0.025%,其余为Fe和不可避免的杂质;生产工艺如下:
(1)连铸:矩形坯350*430mm,结晶器电搅250A、2.5HZ,总压下量24mm,矩形坯采用堆冷24h。
(2)矩形坯加热:350*430mm矩形坯开坯成150*150mm方坯,加热段1220℃,均热段1220℃,开轧温度1120℃;在炉时间260min。
(3)矩形坯开坯:第1道单道压下量28%,第2道单道压下量24%。
(4)方坯修磨:方坯采用16目砂轮全修磨一遍。
(5)盘条轧制:加热段1180℃,均热段1140℃,开轧温度1030℃,在炉时间120min;吐丝温度820℃。
盘条带状组织2.0级,见图1。
实施例2:
一种热轧冷镦钢盘条的生产方法,轧制规格Φ10mm。
钢的化学成分组成重量百分比为:C=0.44%,Si=0.18%,Mn=0.76%,P=0.013%,S=0.005%,Al=0.027%,其余为Fe和不可避免的杂质;生产工艺如下:
(1)连铸:矩形坯350*430mm,结晶器电搅250A、2.5HZ,总压下量25mm,矩形坯采用堆冷24h;
(2)矩形坯加热:350*430mm矩形坯开坯成150*150mm方坯,加热段1220℃,均热段1210℃,开轧温度1100℃;在炉时间240min;
(3)矩形坯开坯:第1道单道压下量28%,第2道单道压下量24%;
(4)方坯修磨:方坯采用16目砂轮全修磨一遍;
(5)盘条轧制:加热段1170℃,均热段1120℃,开轧温度1040℃,在炉时间120min;吐丝温度820℃。
盘条带状组织1.5级,见图2。
Claims (1)
1.一种热轧冷镦钢盘条的生产方法,其特征在于:钢的化学成分组成重量百分比为C=0.43%~0.45%,Si=0.12%~0.20%,Mn=0.70%~0.80%,P≤0.020%,S≤0.010%,Al≥0.020%,其余为Fe和不可避免的杂质;包括以下工艺步骤:
(1)连铸:连铸采用大断面矩形坯350*430mm,并且采用结晶器电磁搅拌+末端重压下,结晶器电搅参数为250A、2.5HZ,总压下量≥20mm,矩形坯采用堆冷≥24h;
(2)矩形坯加热:350*430mm矩形坯开坯成150*150mm方坯,加热段1200~1250℃,均热段1200~1230℃,开轧温度1100~1150℃,在炉时间240~330min;
(3)矩形坯开坯:采用大压下量轧制,前2道单道压下量≥20%;
(4)方坯修磨:150*150mm方坯采用全修磨;
(5)盘条轧制:加热段1150~1200℃,均热段1100~1150℃,开轧温度1000~1050℃,在炉时间≥100min;吐丝温度800℃~850℃。
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