CN116590505A - 一种降低线材盘卷脱碳层深度的生产方法 - Google Patents
一种降低线材盘卷脱碳层深度的生产方法 Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 238000005096 rolling process Methods 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 238000010583 slow cooling Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 4
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 17
- 239000010959 steel Substances 0.000 claims description 17
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- 238000004321 preservation Methods 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 238000005498 polishing Methods 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 2
- 238000000227 grinding Methods 0.000 abstract description 5
- 238000005261 decarburization Methods 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 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
- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
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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
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/84—Controlled slow cooling
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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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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
一种降低线材盘卷脱碳层深度的生产方法，盘卷钢的化学组成重量百分比为C=0.38%～0.42%，Si=0.20%～0.35%，Mn=0.60%～0.90%，P≤0.020%，S≤0.010%，Al≥0.020%，Cr=0.90%～1.20%，Mo=0.15%～0.25%，其余为Fe和不可避免的杂质：钢坯按修磨—加热—轧制—集卷—缓冷工艺流程进行生产。可利用现有设备和工艺条件，将线材盘卷脱碳层控制到0.6%D以内，表面无全脱碳层。
Description
技术领域
本发明属于属于钢铁产品生产工艺技术领域，涉及一种降低线材盘卷脱碳层深度的生产方法。
背景技术
脱碳是钢材疲劳性能降低的主要原因之一,材料表面脱碳将严重损害其疲劳性能,特别当钢材表面出现铁素体的全脱碳时,其抗疲劳极限可降低50%以上。生产高强度零件的钢材含碳量大多在0.30%及以上。为保证安全，汽车用高强度线材对盘条的表面脱碳提出了很高的要求，不仅不允许有全脱碳层，且要求总脱碳层深度小于0.8％D（D为盘卷公称直径，单位mm）甚至更低。为提高大规格盘卷质量，如何降低盘卷的表面脱碳，控制线材盘卷表面脱碳层深度，是急需解决的问题。
发明内容
本发明的目的是提供一种降低线材盘卷脱碳层深度的生产方法,能将热轧线材盘卷脱碳层控制到0.6%D以内，表面无全脱碳层。
本发明的技术方案如下：
一种降低线材盘卷脱碳层深度的生产方法，盘卷钢的化学组成重量百分比为：C=0.38%～0.42%，Si=0.20%～0.35%，Mn=0.60%～0.90%，P≤0.020%，S≤0.010%，Al≥0.020%，Cr=0.90%～1.20%，Mo=0.15%～0.25%，其余为Fe和不可避免的杂质；关键工艺步骤包括：
（1）钢坯处理：对钢坯进行全修磨处理，修磨深度≥1.0mm；
（2）钢坯加热：加热炉残氧量≤3%，均热段1050～1080℃，在炉时间80～120min；
（3）轧制：开轧温度970～1000℃，集卷温度750～780℃；
（4）冷却：集卷后盘卷进保温罩进行缓冷，对保温罩进行密封，并在罩内充氮气进行保护，保持罩内氮气压力相对罩外一直为正压力。
本发明的优点：采用钢坯修磨工艺对钢坯初始脱碳层进行去除，控制加热炉的炉内氧化气氛、降低加热温度和缩短在炉时间来控制加热过程中产生的表面脱碳，降低开轧温度可减少轧制过程中的脱碳层产生速度，且集卷温度避开800度左右的全脱碳层产生敏感温度。集卷后盘卷进保温罩进行缓冷，对保温罩进行密封并在罩内充氮气进行保护，保持罩内氮气压力相对罩外一直为正压力隔绝氧气与盘条相接触，防止了盘条表面全脱碳层的产生，并且已产生的脱碳层不再加深。
附图说明
图1为实施例1盘条脱碳层图。
图2为实施例2盘条脱碳层图。
具体实施方式
下面结合实施例对本发明作进一步说明。
以下实施例均用150mm×150mm钢坯，按修磨—加热—轧制—集卷—缓冷工艺流程进行生产。
实施例1：
一种降低线材盘卷脱碳层深度的生产方法，轧制规格Φ22mm。钢的化学成分组成重量百分比为C=0.40%，Si=0.24%，Mn=0.74%，P=0.015%，S=0.004%，Al=0.028%，Cr=0.97%，钼Mo=0.16%，其余为Fe和不可避免的杂质;工艺步骤如下：
（1）钢坯处理：对钢坯进行全修磨处理，修磨深度1.2mm；
（2）钢坯加热：加热炉残氧量2.2%，均热段1060℃，在炉时间92min；
（3）轧制：开轧温度985℃，集卷温度760℃；
（4）冷却：集卷后盘卷进保温罩进行缓冷，开启保温罩内氮气保护。
所得盘条脱碳层深度0.07mm（0.3%D），无全脱碳，见附图1。
实施例2：
一种降低线材盘卷脱碳层的生产方法，轧制规格Φ25mm。钢的化学成分组成重量百分比为C=0.40%，Si=0.25%，Mn=0.75%，P=0.014%，S=0.005%，Al=0.030%，Cr=0.96%，Mo=0.16%，其余为Fe和不可避免的杂质；生产工艺步骤如下：
（1）钢坯处理：对钢坯进行全修磨处理，修磨深度1.2mm；
（2）钢坯加热：加热炉残氧量2%，均热段1070℃，在炉时间91min；
（3）轧制：开轧温度980℃，集卷温度770℃；
（4）冷却：集卷后盘卷进保温罩进行缓冷，开启保温罩内氮气保护。
所得盘条脱碳层深度0.08mm（0.3%D），无全脱碳，见附图2。
Claims (1)
1.一种降低线材盘卷脱碳层深度的生产方法，其特征在于：盘卷钢的化学组成重量百分比为C=0.38%～0.42%，Si=0.20%～0.35%，Mn=0.60%～0.90%，P≤0.020%，S≤0.010%，Al≥0.020%，Cr=0.90%～1.20%，Mo=0.15%～0.25%，其余为Fe和不可避免的杂质；关键工艺步骤包括：
（1）钢坯处理：对钢坯进行全修磨处理，修磨深度≥1.0mm；
（2）钢坯加热：加热炉残氧量≤3%，均热段1050～1080℃，在炉时间80～120min；
（3）轧制：开轧温度970～1000℃，集卷温度750～780℃；
（4）冷却：集卷后盘卷进保温罩进行缓冷，对保温罩进行密封，并在罩内充氮气进行保护，保持罩内氮气压力相对罩外一直为正压力。
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