CN114918621A - 免矫直锅炉吊杆用圆钢的生产方法 - Google Patents
免矫直锅炉吊杆用圆钢的生产方法 Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 18
- 239000000126 substance Substances 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 229910001562 pearlite Inorganic materials 0.000 claims abstract description 5
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims description 26
- 238000009749 continuous casting Methods 0.000 claims description 8
- 238000007670 refining Methods 0.000 claims description 8
- 238000005096 rolling process Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims 1
- 238000005452 bending Methods 0.000 abstract description 4
- 238000005520 cutting process Methods 0.000 description 2
- 238000010583 slow cooling Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
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- 238000009413 insulation Methods 0.000 description 1
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- 238000005272 metallurgy Methods 0.000 description 1
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- 239000002994 raw material Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
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- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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Abstract
本发明为一种免矫直锅炉吊杆用圆钢的生产方法，钢的化学成分质量百分比（wt%）为C=0.17～0.21；Si≤0.40；Mn=0.40~0.60；P≤0.020；S≤0.020；Cr=0.10～0.25；Al=0.01~0.06；Ni≤0.10；Cu≤0.10；Mo≤0.05；As≤0.015；Sn≤0.015；Pb≤0.015；Sb≤0.015；Bi≤0.010，余量为Fe和不可避免的杂质。本发明生产的圆钢，金相组织为铁素铁+珠光体，具有圆钢弯曲度低，锅炉吊杆生产厂家使用前无需矫直的特点。
Description
技术领域
本发明属于冶金技术领域，涉及一种免矫直锅炉吊杆用圆钢的生产方法。
背景技术
在大型锅炉机组中，除空气预热器、省煤器和循环流化床的旋风分离器之外，几乎都采用全悬吊的支吊系统。锅炉本体各承压部件，附着在承压部件上的燃烧设备、刚性梁、各类门孔、烟风道、炉顶罩壳、保温材料、介质等重量通过各种吊杆悬挂在锅炉顶板梁格上，并经主梁将荷载传给锅炉构架柱子。这些吊杆所承受的持续荷载，随着锅炉重量的大小，从几百吨到上万吨，有时还要考虑风、雪和地震引起的临时荷载的作用，同时还要考虑在400~600℃高温工作下由于热膨胀而引起的弯曲应力。因此，锅炉吊杆的工作条件是比较复杂的。
锅炉吊杆失效造成的损失也是巨大的，从安全性这个角度来说，它比锅炉的任何部件都重要，故需考虑更大的安全系数。载荷偏载是造成锅炉吊杆失效的其中一项常见原因，为避免载荷偏载对安全造成影响，对吊杆的弯曲度要求极严。目前常规做法是吊杆生产厂家对原料进行矫直后生产，生产效率不高。
发明内容
本发明提供一种免矫直锅炉吊杆用圆钢的生产方法，根据合金元素对微观组织、收缩应力的影响，结合现有设备和工艺条件，生产出一种免矫直锅炉吊杆用圆钢，圆钢弯曲度低，客户使用前无需矫直。
发明的技术方案：
免矫直锅炉吊杆用圆钢的生产方法，工艺流程为转炉—精炼—连铸—加热炉—轧制—冷床—锯切—堆垛，钢的化学成分质量百分比（wt%）为C=0.17～0.21，Si≤0.40，Mn=0.40~0.60，P≤0.020，S≤0.020，Cr=0.10～0.25，Al=0.01~0.06，Ni≤0.10，Cu≤0.10，Mo≤0.05，As≤0.015，Sn≤0.015，Pb≤0.015，Sb≤0.015，Bi≤0.010，余量为Fe和不可避免的杂质；关键工艺步骤包括：
（1）经转炉、精炼、连铸工序后，快速下冷床，使用保温车热送热装，热装温度≥500℃；
（2）轧制后采用先快冷，后冷床密排缓冷并在线矫直再强制冷却的冷却工艺，锯切温度≤300℃，使圆钢获得铁素体+珠光体的金相组织；
（3）一字型密排堆垛，支撑间隔≤3m。
本发明的优点：生产的圆钢弯曲度低，客户使用前无需矫直。
附图说明
图1为本发明实施例1的圆钢的金相组织图。
图2为本发明实施例2的圆钢的金相组织图。
具体实施方式
实施例1
免矫直锅炉吊杆用圆钢的生产方法，按转炉—精炼—连铸—加热炉—轧制—冷床—锯切—堆垛的工艺流程进行。钢的化学成分质量百分比见表1，余量为Fe和不可避免的杂质；关键工艺步骤包括：
（1）经转炉、精炼、连铸工序生产后，快速下冷床，使用保温车热送热装，热装温度511℃；
（2）轧制φ85mm规格圆钢，采用先快冷，后冷床密排缓冷并在线矫直，再强制冷却的冷却工艺；锯切温度263℃，锯切定尺长度11m；
（3）成品材采用支撑间隔为2m的专用货架一字型密排堆垛。
圆钢成品检测结果：弯曲度为0.7mm/m；金相组织如图1 所示，X500下显示组织为铁素体+珠光体。
实施例2
免矫直锅炉吊杆用圆钢的生产方法，按转炉—精炼—连铸—加热炉—轧制—冷床—锯切—堆垛的工艺流程进行。钢的化学成分质量百分比见表1，余量为Fe和不可避免的杂质；关键工艺步骤包括：
（1）经转炉、精炼、连铸工序生产后，快速下冷床，使用保温车热送热装，热装温度515℃；
（2）轧制φ40mm规格圆钢，采用先快冷，后冷床密排缓冷并在线矫直，再强制冷却的冷却工艺；锯切温度271℃，锯切定尺长度12m；
（3）成品材采用支撑间隔为2m的专用货架一字型密排堆垛。
圆钢成品检测结果：弯曲度0.9mm/m；金相组织如图2 所示，X500下显示组织为铁素体+珠光体。
表1 实施例化学成分重量百分组成（%）
Claims (1)
1.免矫直锅炉吊杆用圆钢的生产方法，工艺流程为转炉—精炼—连铸—加热炉—轧制—冷床—锯切—堆垛，其特征在于：钢的化学成分质量百分比（wt%）为C=0.17～0.21，Si≤0.40，Mn=0.40~0.60，P≤0.020，S≤0.020，Cr=0.10～0.25， Al=0.01~0.06，Ni≤0.10，Cu≤0.10，Mo≤0.05，As≤0.015，Sn≤0.015，Pb≤0.015，Sb≤0.015，Bi≤0.010，余量为Fe和不可避免的杂质；关键工艺步骤包括：
（1）经转炉、精炼、连铸工序后，快速下冷床，使用保温车热送热装，热装温度≥500℃；
（2）轧制后采用先快冷，后冷床密排缓冷并在线矫直再强制冷却的冷却工艺，锯切温度≤300℃，使圆钢获得铁素体+珠光体的金相组织；
（3）一字型密排堆垛，支撑间隔≤3m。
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|---|---|---|---|---|
| CN103526129A (zh) * | 2013-09-27 | 2014-01-22 | 济钢集团有限公司 | 一种厚规格抗酸性腐蚀x65管线钢板及其制造方法 |
| CN106756527A (zh) * | 2016-11-15 | 2017-05-31 | 南京钢铁股份有限公司 | 一种液化气体船用碳锰低温钢及制造方法 |
| CN108500080A (zh) * | 2018-03-09 | 2018-09-07 | 泰州市大明不锈钢有限公司 | 一种不锈钢棒材圆钢生产工艺 |
| CN108676965A (zh) * | 2018-05-22 | 2018-10-19 | 湖南华菱湘潭钢铁有限公司 | 一种高层建筑结构用热轧圆钢的生产方法 |
| CN109988973A (zh) * | 2019-05-22 | 2019-07-09 | 湖南华菱湘潭钢铁有限公司 | 一种车轴轴头用热轧圆钢的生产方法 |
| US20200071783A1 (en) * | 2016-10-18 | 2020-03-05 | Jiangyin Xing Cheng Special Steel Works Co., Ltd | A rack steel plate with a thickness up to 177.8 mm by a continuous casting slab and manufacturing method thereof |
| CN110983190A (zh) * | 2019-12-26 | 2020-04-10 | 芜湖新兴铸管有限责任公司 | 一种645MPa级高强抗震带肋钢筋及其生产方法 |
| CN113646447A (zh) * | 2019-03-19 | 2021-11-12 | 杰富意钢铁株式会社 | 轨道的制造方法 |
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103526129A (zh) * | 2013-09-27 | 2014-01-22 | 济钢集团有限公司 | 一种厚规格抗酸性腐蚀x65管线钢板及其制造方法 |
| US20200071783A1 (en) * | 2016-10-18 | 2020-03-05 | Jiangyin Xing Cheng Special Steel Works Co., Ltd | A rack steel plate with a thickness up to 177.8 mm by a continuous casting slab and manufacturing method thereof |
| CN106756527A (zh) * | 2016-11-15 | 2017-05-31 | 南京钢铁股份有限公司 | 一种液化气体船用碳锰低温钢及制造方法 |
| CN108500080A (zh) * | 2018-03-09 | 2018-09-07 | 泰州市大明不锈钢有限公司 | 一种不锈钢棒材圆钢生产工艺 |
| CN108676965A (zh) * | 2018-05-22 | 2018-10-19 | 湖南华菱湘潭钢铁有限公司 | 一种高层建筑结构用热轧圆钢的生产方法 |
| CN113646447A (zh) * | 2019-03-19 | 2021-11-12 | 杰富意钢铁株式会社 | 轨道的制造方法 |
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