CN116855707A - 一种药芯焊丝专用含硼低碳钢的制造方法 - Google Patents
一种药芯焊丝专用含硼低碳钢的制造方法 Download PDFInfo
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- 229910052796 boron Inorganic materials 0.000 title claims abstract description 53
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 229910001209 Low-carbon steel Inorganic materials 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 238000005096 rolling process Methods 0.000 claims abstract description 42
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 39
- 239000010959 steel Substances 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 34
- 238000010438 heat treatment Methods 0.000 claims abstract description 22
- 238000000137 annealing Methods 0.000 claims abstract description 21
- 238000001816 cooling Methods 0.000 claims abstract description 17
- 238000005098 hot rolling Methods 0.000 claims abstract description 13
- 239000010960 cold rolled steel Substances 0.000 claims abstract description 12
- 238000005097 cold rolling Methods 0.000 claims abstract description 11
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 8
- 238000010079 rubber tapping Methods 0.000 claims abstract description 7
- 238000002791 soaking Methods 0.000 claims abstract description 6
- 230000003746 surface roughness Effects 0.000 claims abstract description 6
- 229910000859 α-Fe Inorganic materials 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 4
- 238000011217 control strategy Methods 0.000 claims description 3
- 239000000047 product Substances 0.000 claims 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 1
- 239000012467 final product Substances 0.000 claims 1
- 238000003466 welding Methods 0.000 abstract description 20
- 238000009628 steelmaking Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 8
- 239000000843 powder Substances 0.000 description 7
- 239000002184 metal Substances 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 235000020610 powder formula Nutrition 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
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- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
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- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
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Abstract
本发明涉及冶金炼钢技术领域,具体公开了一种药芯焊丝专用含硼低碳钢的制造方法,包括以下步骤:S1、热轧加热工序:控制板坯在加热炉的加热总时间和出炉温度;S2、精轧工序:控制精轧机出口的终轧温度;S3、层流冷却工序:均匀冷却模式;S4、热轧卷取工序:控制带钢中部卷取温度;S5、冷轧工序:五机架连轧,并设定总压下率;S6、退火工序:采用连续退火工艺,并控制退火炉内均热段温度;S7、平整工序:退火出口平整机采用恒延伸率模式轧制,并控制总延伸率和表面粗糙度;S8、制得药芯焊丝专用含硼低碳冷轧钢带;本发明提供的药芯焊丝专用低碳钢通过在钢带中加硼,降低用户生产成本;焊丝产品的力学性能和焊接性能更加稳定。
Description
技术领域
本发明涉及冶金炼钢技术领域,具体涉及一种药芯焊丝专用含硼低碳钢的制造方法。
背景技术
药芯焊丝是由冷轧钢带包裹粉料,通过轧机轧制、拉丝机拉拔而成的焊接材料,其中外层冷轧钢带重量占到药芯焊丝总重量的80%~86%,是药芯焊丝的重要组成部分。其生产工艺流程是将冷轧钢带剪裁成宽度8mm~14mm的窄钢带,后轧制成截面为“U”字型槽,槽内填装上药粉,再轧制合缝成截面为“O”字型药芯焊丝坯,进一步拉拔成为φ1.2~φ2.4mm成品焊丝。
药芯焊丝所用的冷轧钢带主要为厚度0.6mm~1.0mm的冷轧退火卷,品种一般为低碳钢、低合金钢等材料。目前国内市场上药芯焊丝所用的冷轧低碳钢带中均不含硼元素,因为硼元素的特性和对轧制稳定性的不利影响,所以在钢厂生产中硼一般作为有害元素进行控制。为了细化焊缝金属晶粒,提高焊缝金属强度,同时防止焊缝内出现较大夹杂,提高材料韧性,焊材厂家会在药芯焊丝药粉配方中添加硼元素。由于只有芯部药粉中含硼而外层钢带不含硼,药粉在焊丝整体中比重不到20%,便会造成硼元素在焊丝整体中分布很不均匀,从而对于焊缝金属成分及性能的稳定性产生不利影响,在行业成本竞争激烈及对产品质量要求不断提高的市场背景下,部分焊材厂家对于含硼的药芯焊丝专用钢带的开发提出了需求。因此,需要设计一种特意添加硼元素的药芯焊丝专用冷轧低碳钢产品和它的主要制造方法,以解决现有药芯焊丝焊缝杂质多、稳定性差的问题。
发明内容
针对现有技术中存在的问题,本发明的目的在于提供一种药芯焊丝专用含硼低碳钢的制造方法。
本发明解决其技术问题所采用的技术方案是:一种药芯焊丝专用含硼低碳钢的制造方法,包括以下步骤:
S1、热轧加热工序:控制板坯在加热炉的加热总时间和出炉温度;
S2、精轧工序:控制精轧机出口的终轧温度;
S3、层流冷却工序:采取均匀冷却模式;
S4、热轧卷取工序:控制带钢中部卷取温度;
S5、冷轧工序:采用五机架连轧,并设定总压下率;
S6、退火工序:采用连续退火工艺,并控制退火炉内均热段温度;
S7、平整工序:退火出口平整机采用恒延伸率模式轧制,并控制总延伸率和表面粗糙度;
S8、制得厚度规格为0.6mm-1.0mm的药芯焊丝专用含硼低碳冷轧钢带。
具体的是,所述含硼低碳钢的化学成分及其质量百分比为:C:0.015%-0.025%,Si:≤0.015%,Mn:0.20%-0.25%,P:≤0.010%,S:≤0.010%,Alt:0.010%-0.040%,B:0.0015%-0.0030%,N:≤0.0040%,其余为Fe元素和极少量不可避免的残余元素。
具体的是,所述步骤S1中的板坯在加热炉内的加热总时间控制在180~260min;板坯的出炉温度控制在1220℃-1260℃。
具体的是,所述步骤S2中的精轧机出口的终轧温度控制在870℃-900℃;精轧工序为七机架连轧,压下率模型自动计算,出口产出厚度为2.5mm-5.0mm的热轧钢带。
具体的是,所述步骤S3中的层流冷却工序采取“U型”冷却控制策略,热头、热尾温度+40℃-50℃,热头、热尾长度各60m。
具体的是,所述步骤S4中的带钢中部卷取温度控制在660℃-690℃;下线热轧钢卷采取集中堆垛冷却。
具体的是,所述步骤S5中的总压下率对应成品厚度不同设定在72.0%~82.8%。
具体的是,所述步骤S6中的退火炉内均热段温度设定为760℃-780℃。
具体的是,所述步骤S7中的总延伸率根据产品厚度不同设定在0.7%-1.0%;根据轧辊粗糙度情况安排辊期,平整机出口钢带表面粗糙度控制在0.6μm-1.5μm。
具体的是,所述步骤S8中的含硼低碳冷轧钢带的屈服强度为160MPa-200MPa,抗拉强度为290MPa-340MPa,轧制方向断后伸长率为A50≥43%,表面硬度为35HRB-50HRB;成品显微组织为铁素体,晶粒度大小为6.5级-9级。
本发明具有以下有益效果:
1、本发明提供的药芯焊丝专用低碳钢通过在钢带中加硼,终端焊材用户便可在药粉配料中少加硼甚至是不加硼,因而降低用户生产成本;
2、本发明提供的药芯焊丝专用低碳钢通过在钢带中加硼,替代了传统焊丝制造的硼元素仅分布在芯部药粉中,硼元素在焊丝产品中整体分布更为均匀,因此焊丝产品的力学性能和焊接性能更加稳定;
3、本发明提供的药芯焊丝专用含硼低碳钢,钢带力学性能相对常规不含硼钢带产品更加优良,具备更低的屈服强度和硬度,更高的延伸率,因此应用中具备更好的拉丝成型性能。
附图说明
图1是实施例1冷轧成品的显微组织示意图。
图2是实施例2冷轧成品的显微组织示意图。
图3是实施例3冷轧成品的显微组织示意图。
具体实施方式
以下将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地进一步详细的说明。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
一种药芯焊丝专用含硼低碳钢,其主要化学成分及其质量百分比为:C:0.015%-0.025%,Si:≤0.015%,Mn:0.20%-0.25%,P:≤0.010%,S:≤0.010%,Alt:0.010%-0.040%,B:0.0015%-0.0030%,N:≤0.0040%,其余为Fe元素和极少量不可避免的残余元素。
本发明提供的该药芯焊丝专用含硼低碳钢的主要制造方法工艺流程为:炼铁→炼钢→热轧→酸洗→冷轧→退火。因为硼元素的加入,增加了钢的淬透性,提高了钢在轧制中的板形控制和组织控制难度,因此所述制造方法中:
1、热轧加热工序
1)加热工序板坯在加热炉内加热总时间控制在180-260min;
2)加热工序板坯的出炉温度控制在1220℃-1260℃。
加热工序设定以上加热时间和出炉温度,目的在于高温时含硼低碳钢变形抗力减小,容易塑性变形,板形控制难度低,但在能保证轧制稳定性的基础上,加热时间避免过长,以减少加热过程中脱硼,同时减少晶界硼相的析出浓度。
2、精轧工序
1)精轧出口终轧温度控制在870℃-900℃;
2)精轧工序为七机架连轧,压下率模型自动计算,出口产出厚度为2.5mm-5.0mm的热轧钢带。
加硼焊丝钢终轧温度控制相对常规低碳钢较高,原因在于终轧温度对带钢组织有着重要影响,尤其是决定了带钢边部的组织,含硼焊丝钢采用较高的终轧温度,一是为了提高精轧区域轧制速度,减少尾部温降,避免板形发生突变;二是避免带钢边部产生先共析铁素体,降低材料塑性,在后续冷轧工序中发生边裂的质量问题。
3、层流冷却工序
1)层流冷却工序采取均匀冷却模式;
2)层流冷却采取“U型”冷却控制策略,热头、热尾温度+40℃-50℃,热头、热尾长度各60m。
加硼焊丝钢采用以上层冷方法,目的在于使焊丝钢热轧板获得较大的晶粒组织,避免钢带内应力影响板形质量,提高热轧卷及冷轧成品全长性能的均匀性。
4、热轧卷取工序
1)卷取工序带钢中部卷取温度控制在660℃-690℃;
2)下线热轧钢卷采取集中堆垛冷却。
加硼焊丝钢卷取温度控制相对常规低碳钢较高,目的在于卷取温度的提高有利于晶粒回复,降低材料硬度,减少出现纤维状组织的概率。
5、冷轧工序
冷轧工序为五机架连轧,总压下率对应成品厚度不同设定在72.0%-82.8%。
6、退火工序
退火工序为连续退火工艺,退火炉内均热段温度设定为760℃-780℃。
7、平整工序
1)退火出口平整机采用恒延伸率模式轧制,总延伸率根据产品厚度不同设定在0.7%-1.0%;
2)根据轧辊粗糙度情况安排辊期,平整机出口钢带表面粗糙度控制在0.6μm-1.5μm。
以上所述制造方法最终得到的厚度规格为0.6mm-1.0mm的药芯焊丝专用含硼低碳冷轧钢带。
该钢带成品的屈服强度为160MPa-200MPa,抗拉强度为290MPa-340MPa,轧制方向断后伸长率为A50≥43%,表面硬度为35HRB-50HRB。成品显微组织为铁素体,晶粒度大小为6.5级-9级。
实施例1-3
实施例1-3熔炼成分结果如表1所示,除表中所示元素外其余为Fe元素和极少量不可避免的残余元素。
表1实施例1-3中主要冶炼化学成分表
按照表1中成分得到的实施例1-3的铸坯,再依次通过加热、粗轧、精轧、层流冷却、卷取工序处理,得到热轧钢卷,该过程统称为热轧过程,其热轧过程重点工序参数如表2所示。
表2实施例1-3中热轧过程工序参数
按照表2中的热轧工艺得到的实施例1-3的热轧钢卷,再依次通过酸洗、冷轧、退火、平整、成品卷取等工序处理,最终得到冷轧成品钢卷,该过程统称为冷轧过程,其冷轧过程重点工序参数如表3所示。
表3实施例1-3中冷轧过程参数
按上述方法得到的实施例1-3的药芯焊丝专用含硼低碳冷轧钢带,其成品力学性能情况如表4所示。
表4实施例1-3钢带成品性能情况
按上述方法得到的实施例1-3的药芯焊丝专用含硼低碳冷轧钢带,其成品显微组织为铁素体,具体如图1-3所示。
本发明不局限于上述实施方式,任何人应得知在本发明的启示下作出的结构变化,凡是与本发明具有相同或相近的技术方案,均落入本发明的保护范围之内。
本发明未详细描述的技术、形状、构造部分均为公知技术。
Claims (10)
1.一种药芯焊丝专用含硼低碳钢的制造方法,其特征在于,包括以下步骤:
S1、热轧加热工序:控制板坯在加热炉的加热总时间和出炉温度;
S2、精轧工序:控制精轧机出口的终轧温度;
S3、层流冷却工序:采取均匀冷却模式;
S4、热轧卷取工序:控制带钢中部卷取温度;
S5、冷轧工序:采用五机架连轧,并设定总压下率;
S6、退火工序:采用连续退火工艺,并控制退火炉内均热段温度;
S7、平整工序:退火出口平整机采用恒延伸率模式轧制,并控制总延伸率和表面粗糙度;
S8、制得厚度规格为0.6mm-1.0mm的药芯焊丝专用含硼低碳冷轧钢带。
2.根据权利要求1所述的药芯焊丝专用含硼低碳钢的制造方法,其特征在于,所述含硼低碳钢的化学成分及其质量百分比为:C:0.015%-0.025%,Si:≤0.015%,Mn:0.20%-0.25%,P:≤0.010%,S:≤0.010%,Alt:0.010%-0.040%,B:0.0015%-0.0030%,N:≤0.0040%,其余为Fe元素和极少量不可避免的残余元素。
3.根据权利要求1所述的药芯焊丝专用含硼低碳钢的制造方法,其特征在于,所述步骤S1中的板坯在加热炉内的加热总时间控制在180~260min;板坯的出炉温度控制在1220℃-1260℃。
4.根据权利要求1所述的药芯焊丝专用含硼低碳钢的制造方法,其特征在于,所述步骤S2中的精轧机出口的终轧温度控制在870℃-900℃;精轧工序为七机架连轧,压下率模型自动计算,出口产出厚度为2.5mm-5.0mm的热轧钢带。
5.根据权利要求1所述的药芯焊丝专用含硼低碳钢的制造方法,其特征在于,所述步骤S3中的层流冷却工序采取“U型”冷却控制策略,热头、热尾温度+40℃-50℃,热头、热尾长度各60m。
6.根据权利要求1所述的药芯焊丝专用含硼低碳钢的制造方法,其特征在于,所述步骤S4中的带钢中部卷取温度控制在660℃-690℃;下线热轧钢卷采取集中堆垛冷却。
7.根据权利要求1所述的药芯焊丝专用含硼低碳钢的制造方法,其特征在于,所述步骤S5中的总压下率对应成品厚度不同设定在72.0%~82.8%。
8.根据权利要求1所述的药芯焊丝专用含硼低碳钢的制造方法,其特征在于,所述步骤S6中的退火炉内均热段温度设定为760℃-780℃。
9.根据权利要求1所述的药芯焊丝专用含硼低碳钢的制造方法,其特征在于,所述步骤S7中的总延伸率根据产品厚度不同设定在0.7%-1.0%;根据轧辊粗糙度情况安排辊期,平整机出口钢带表面粗糙度控制在0.6μm-1.5μm。
10.根据权利要求1所述的药芯焊丝专用含硼低碳钢的制造方法,其特征在于,所述步骤S8中的含硼低碳冷轧钢带的屈服强度为160MPa-200MPa,抗拉强度为290MPa-340MPa,轧制方向断后伸长率为A50≥43%,表面硬度为35HRB-50HRB;成品显微组织为铁素体,晶粒度大小为6.5级-9级。
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