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CN112474870A - 一种316食品级洁净不锈钢无缝管的生产工艺 - Google Patents

一种316食品级洁净不锈钢无缝管的生产工艺 Download PDF

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CN112474870A
CN112474870A CN202011298293.8A CN202011298293A CN112474870A CN 112474870 A CN112474870 A CN 112474870A CN 202011298293 A CN202011298293 A CN 202011298293A CN 112474870 A CN112474870 A CN 112474870A
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raw material
material pipe
production process
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food
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陈小华
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Zhejiang Yiteng Special Steel Pipe Co ltd
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Zhejiang Yiteng Special Steel Pipe Co ltd
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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
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/10—Making tubes with riveted seams or with non-welded and non-soldered seams
    • B21C37/107—Tube treating or manipulating combined with or specially adapted for use in connection with tube-making machines, e.g. drawing-off devices, cutting-off
    • 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
    • B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
    • B21C1/22—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles
    • 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
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/30—Finishing tubes, e.g. sizing, burnishing
    • 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
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • C21D9/085—Cooling or quenching
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
    • C23C8/30—Carbo-nitriding
    • C23C8/32—Carbo-nitriding of ferrous surfaces

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Metal Extraction Processes (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

本发明公开了一种316食品级洁净不锈钢无缝管的生产工艺，依次包括如下步骤：步骤一：管坯穿孔，步骤二：酸洗除杂，步骤三：管坯拉拔，步骤四：修磨矫直，步骤五：光亮退火，步骤六：共渗处理，步骤七：分级淬火，步骤八：回火，步骤九：检验入库。本发明能够提高食品级不锈钢管的壁厚均匀性，能够提高食品级不锈钢管的表面光洁度和耐腐蚀能力。

Description

一种316食品级洁净不锈钢无缝管的生产工艺
【技术领域】
本发明涉及无缝钢管生产的技术领域，特别是一种316食品级洁净不锈钢无缝管的生产工艺的技术领域。
【背景技术】
食品级不锈钢管在多行业中广泛应用，其内表面光洁度要求高。不锈钢管内外表面处理好坏与耐腐蚀能力之间关系十分密切，表面光洁度越高，杂质粘附就越困难，越有利于耐腐蚀能力的提高；管内表面光洁度越高时，内流液体介质滞留就越少，也越有利于冲洗，耐腐能力将大大提高。现有的生产技术中，对于产品内表面的粗糙度控制不是很精确，合格率低，生产成本较高。
【发明内容】
本发明的目的就是解决现有技术中的问题，提出一种316食品级洁净不锈钢无缝管的生产工艺，能够提高食品级不锈钢管的壁厚均匀性，能够提高食品级不锈钢管的表面光洁度和耐腐蚀能力。
为实现上述目的，本发明提出了一种316食品级洁净不锈钢无缝管的生产工艺，依次包括如下步骤：
步骤一：管坯穿孔，对原料管坯加热，加热温度为1150-1200℃，而后根据不同钢管壁厚保温时间为20-30min,在穿孔机上对加热后的管坯进行穿孔，穿孔温度为1100-1150℃，并进行打头；
步骤二：酸洗除杂，对步骤一处理后的原料管坯浸没在酸洗液中进行酸洗除杂，酸洗后用清水冲洗，沥干水分；
步骤三：管坯拉拔，将步骤二处理后的原料管坯进行表面涂油润滑，将原料管坯送入拉拔机通过内模套与拉拔模套配合进行拉拔作业，重复上述操作多次；
步骤四：修磨矫直，将步骤三处理后的原料管坯进行修磨扩径，修磨扩径后进行原料管坯矫直，对原料管坯进行冲洗干燥；
步骤五：光亮退火，将步骤四处理后的原料管坯送入热处理炉中进行光亮退火，温度规模为1100-1120℃，光亮退火过程中充入纯氢作为保护气氛；
步骤六：共渗处理，将步骤五处理后的原料管坯送入共渗炉中进行共渗处理，达到指定共渗层厚度后保温30-50min；
步骤七：分级淬火，将步骤六处理后的原料管坯送入淬火炉中进行分级淬火；
步骤八：回火，将步骤七处理后的原料管坯进行回火处理；
步骤九：检验入库，将步骤八处理后的原料管坯进行干燥、矫直、切管、精整、检验和探伤，合格后打包入库。
作为优选，所述步骤三中内模套与拉拔模套间隙配合，内模套能够在周向应力差的作用下进行旋转。
作为优选，所述步骤五的热处理炉中设置有除湿器，保护气氛的压力为25kBar-30kBar，光亮退火时间为2-3h。
作为优选，所述步骤六的共渗处理中共渗层的厚度为80-90μm，在520-580℃下进行保温时，共渗层的韧性。
作为优选，所述步骤六共渗过程中通入氮气、氨气和一氧化碳气体，氮气的通入量8-9L/h，氨气的通入量3-5L/h，一氧化碳气体的通入量为6-8L/h。
本发明的有益效果：本发明采用拉拔模具进行拉拔，内模套与拉拔模套间隙配合，能够避免内模套与拉拔模套之间产生摩擦阻力，确保了内模套能够在周向应力差的作用下转动起来，从而能够提高成品的壁厚均匀性，表面光滑度及产品质量，共渗处理后再通过分级淬火，使共渗层与钢管的结合更紧密，能够提高食品级不锈钢管的壁厚均匀性，能够提高食品级不锈钢管的表面光洁度和耐腐蚀能力。
本发明的特征及优点将通过实施例进行详细说明。
【具体实施方式】
本发明一种316食品级洁净不锈钢无缝管的生产工艺，依次包括如下步骤：
步骤一：管坯穿孔，对原料管坯加热，加热温度为1150-1200℃，而后根据不同钢管壁厚保温时间为20-30min,在穿孔机上对加热后的管坯进行穿孔，穿孔温度为1100-1150℃，并进行打头；
步骤二：酸洗除杂，对步骤一处理后的原料管坯浸没在酸洗液中进行酸洗除杂，酸洗后用清水冲洗，沥干水分；
步骤三：管坯拉拔，将步骤二处理后的原料管坯进行表面涂油润滑，将原料管坯送入拉拔机通过内模套与拉拔模套配合进行拉拔作业，重复上述操作多次；
步骤四：修磨矫直，将步骤三处理后的原料管坯进行修磨扩径，修磨扩径后进行原料管坯矫直，对原料管坯进行冲洗干燥；
步骤五：光亮退火，将步骤四处理后的原料管坯送入热处理炉中进行光亮退火，温度规模为1100-1120℃，光亮退火过程中充入纯氢作为保护气氛；
步骤六：共渗处理，将步骤五处理后的原料管坯送入共渗炉中进行共渗处理，达到指定共渗层厚度后保温30-50min；
步骤七：分级淬火，将步骤六处理后的原料管坯送入淬火炉中进行分级淬火；
步骤八：回火，将步骤七处理后的原料管坯进行回火处理；
步骤九：检验入库，将步骤八处理后的原料管坯进行干燥、矫直、切管、精整、检验和探伤，合格后打包入库。
所述步骤三中内模套与拉拔模套间隙配合，内模套能够在周向应力差的作用下进行旋转，所述步骤五的热处理炉中设置有除湿器，保护气氛的压力为25kBar-30kBar，光亮退火时间为2-3h，所述步骤六的共渗处理中共渗层的厚度为80-90μm，在520-580℃下进行保温时，共渗层的韧性，所述步骤六共渗过程中通入氮气、氨气和一氧化碳气体，氮气的通入量8-9L/h，氨气的通入量3-5L/h，一氧化碳气体的通入量为6-8L/h。
本发明采用拉拔模具进行拉拔，内模套与拉拔模套间隙配合，能够避免内模套与拉拔模套之间产生摩擦阻力，确保了内模套能够在周向应力差的作用下转动起来，从而能够提高成品的壁厚均匀性，表面光滑度及产品质量，共渗处理后再通过分级淬火，使共渗层与钢管的结合更紧密，能够提高食品级不锈钢管的壁厚均匀性，能够提高食品级不锈钢管的表面光洁度和耐腐蚀能力。
上述实施例是对本发明的说明，不是对本发明的限定，任何对本发明简单变换后的方案均属于本发明的保护范围。

Claims (5)

1.一种316食品级洁净不锈钢无缝管的生产工艺，其特征在于：依次包括如下步骤：
步骤一：管坯穿孔，对原料管坯加热，加热温度为1150-1200℃，而后根据不同钢管壁厚保温时间为20-30min,在穿孔机上对加热后的管坯进行穿孔，穿孔温度为1100-1150℃，并进行打头；
步骤二：酸洗除杂，对步骤一处理后的原料管坯浸没在酸洗液中进行酸洗除杂，酸洗后用清水冲洗，沥干水分；
步骤三：管坯拉拔，将步骤二处理后的原料管坯进行表面涂油润滑，将原料管坯送入拉拔机通过内模套与拉拔模套配合进行拉拔作业，重复上述操作多次；
步骤四：修磨矫直，将步骤三处理后的原料管坯进行修磨扩径，修磨扩径后进行原料管坯矫直，对原料管坯进行冲洗干燥；
步骤五：光亮退火，将步骤四处理后的原料管坯送入热处理炉中进行光亮退火，温度规模为1100-1120℃，光亮退火过程中充入纯氢作为保护气氛；
步骤六：共渗处理，将步骤五处理后的原料管坯送入共渗炉中进行共渗处理，达到指定共渗层厚度后保温30-50min；
步骤七：分级淬火，将步骤六处理后的原料管坯送入淬火炉中进行分级淬火；
步骤八：回火，将步骤七处理后的原料管坯进行回火处理；
步骤九：检验入库，将步骤八处理后的原料管坯进行干燥、矫直、切管、精整、检验和探伤，合格后打包入库。
2.如权利要求1所述的一种316食品级洁净不锈钢无缝管的生产工艺，其特征在于：所述步骤三中内模套与拉拔模套间隙配合，内模套能够在周向应力差的作用下进行旋转。
3.如权利要求1所述的一种316食品级洁净不锈钢无缝管的生产工艺，其特征在于：所述步骤五的热处理炉中设置有除湿器，保护气氛的压力为25kBar-30kBar，光亮退火时间为2-3h。
4.如权利要求1所述的一种316食品级洁净不锈钢无缝管的生产工艺，其特征在于：所述步骤六的共渗处理中共渗层的厚度为80-90μm，在520-580℃下进行保温时，共渗层的韧性。
5.如权利要求1所述的一种316食品级洁净不锈钢无缝管的生产工艺，其特征在于：所述步骤六共渗过程中通入氮气、氨气和一氧化碳气体，氮气的通入量8-9L/h，氨气的通入量3-5L/h，一氧化碳气体的通入量为6-8L/h。
CN202011298293.8A 2020-11-19 2020-11-19 一种316食品级洁净不锈钢无缝管的生产工艺 Pending CN112474870A (zh)

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* Cited by examiner, † Cited by third party
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