EP2003215B1 - Method for production of martensitic stainless steel pipe - Google Patents

Method for production of martensitic stainless steel pipe Download PDF

Info

Publication number
EP2003215B1
EP2003215B1 EP07740291.5A EP07740291A EP2003215B1 EP 2003215 B1 EP2003215 B1 EP 2003215B1 EP 07740291 A EP07740291 A EP 07740291A EP 2003215 B1 EP2003215 B1 EP 2003215B1
Authority
EP
European Patent Office
Prior art keywords
pipe
content
less
stainless steel
martensitic stainless
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
EP07740291.5A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2003215A4 (en
EP2003215A2 (en
EP2003215A9 (en
Inventor
Kenichi Saito
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel and Sumitomo Metal Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Steel and Sumitomo Metal Corp filed Critical Nippon Steel and Sumitomo Metal Corp
Publication of EP2003215A2 publication Critical patent/EP2003215A2/en
Publication of EP2003215A9 publication Critical patent/EP2003215A9/en
Publication of EP2003215A4 publication Critical patent/EP2003215A4/en
Application granted granted Critical
Publication of EP2003215B1 publication Critical patent/EP2003215B1/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • 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
    • C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
    • 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
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to a method for producing martensitic stainless steel pipe.
  • Martensitic stainless steel pipe containing for example 13 percent chromium is highly susceptible to cracking and so cracks tend to occur when the pipe edges are cut off.
  • a conventional solution was to cool the outer surface (hereafter simply called the "surface") of the pipe prior to cutting, down to 130°C or lower, and preferably 50°C or lower.
  • JP H04-2409 A discloses a process for preventing cracks on the edges of the martensitic stainless steel pipe by a process that air cools hot-worked martensitic stainless steel pipe down to a temperature equal to or below the temperature at which martensite transformation is complete, and then forced cools the pipe by water cooling, and cuts the pipe.
  • Cooling the pipe surface down to 30°C or below lowers the hot workability of the pipe and increases its resistance to deformation during cutting. Cutting, therefore, generates high processing heat between the cutting surface of the pipe and the saw, and it generates burrs after cutting.
  • the cut pipes are usually carried with several pipes in order to increase production efficiency. However, burrs on the pipe edges might form flaws on the outer surface of the pipe due to mutual contact.
  • JP H04-2409 A requires installing additional equipment for the forced cooling, which raises the production cost.
  • the present invention therefore has the object of providing a method for producing a martensitic stainless steel pipe that prevents cracks and burrs during cutting of the pipe.
  • the method for producing a martensitic stainless steel pipe of the present invention comprises the features of claim 1.
  • the martensitic stainless steel pipe may further contain, by mass %, at least one selected from: 0.200% or less of V, 0.200% or less of Ti, 0.200% or less of Nb, and 0.0100% or less of, instead of a part of Fe.
  • the martensitic stainless steel pipe may further contain, by mass %, at least one selected from 0.5% or less of Ni, 0.25% or less of Cu, and 0.0050% or less of Ca, instead of a part of Fe.
  • the martensitic stainless steel pipe may further contain 0.1% or less of Al by mass.
  • the present invention therefore prevents forming cracks and burrs during cutting of the martensitic stainless steel pipe.
  • Fig. 1 is a graph showing the formation of cracks and burrs in relation to the surface temperature of the pipe and the processing degree of outer diameter during cutting.
  • the martensitic stainless steel pipe contains the following elements for the following reasons.
  • C is an effective element as well as N for strengthening the solid solution in the manufactured pipe.
  • the C content should be 0.22% or less in order to prevent delayed fractures on impact-machined sections of the pipe caused by the solid solution.
  • the C content is set from 0.15 to 0.22%.
  • the C content lower limit is set 0.18%.
  • the upper limit is preferably set 0.21%.
  • Si is an effective element serving as deoxidizer in the steel.
  • the Si content should be 0.10% or more.
  • the Si content is preferably set 0.75% or less. More preferably, the Si content lower limit is set 0.20%.
  • the upper limit is preferably set 0.35%.
  • Mn is an effective element for improving the steel strength and has a deoxidizing effect similar to Si. Mn also fixes S in the steel by forming MnS, thereby improving hot workability. The desired effects can be achieved when the Mn content is 0.10% or more. However if the Mn content exceeds 1.00%, the toughness might deteriorate. In view of these circumstances, the Mn content is set between 0.10 to 1.00%.
  • Cr is an essential element for improving the corrosion resistance of the steel.
  • the resistance to pitting and crevice corrosion significantly improves at a content of 12.00% or more. This improvement in corrosion resistance is even more obvious in a CO 2 environment.
  • the Cr content exceeds 14.00%, then 6-ferrite forms during high temperature working and lowers the hot workability.
  • too large a Cr content increases the production costs.
  • the Cr content is set 12.00 to 14.00%.
  • the Cr content lower limit is preferably set 12.40%.
  • the upper limit is preferably set 13.10%.
  • N is an element for stabilizing the austenite and improves the hot workability of the steel to prevent internal flaws.
  • the N content should be 0.01% or more. Since too large an N content might cause delayed fractures in the impact-machined sections of the steel, the upper limit is set to 0.05%.
  • the N content lower limit is 0.02%.
  • the upper limit is preferably set 0.035%.
  • P is an impurity element in the steel. Since too large a phosphorus content could degrade the toughness of the heat-treated pipe, the P content should be kept as small as possible with 0.020% as the allowable upper limit value.
  • S is an impurity element in the steel and degrades the hot workability.
  • the S content should be kept as small as possible but a content up to 0.010% can be allowed.
  • the upper limit is preferably set 0.003%.
  • the martensitic stainless steel pipe produced by the method of the present invention has the above-described chemical composition with the balance being Fe and impurities
  • the pipe may contain at least one selected from V, Ti, Nb, and B instead of a part of Fe.
  • the pipe may contain at least one selected from Ni, Cu, and Ca instead of a part of Fe.
  • the pipe may contain Al to prevent flaws on the exterior of the pipe.
  • V vanadium
  • Ti Ti
  • Nb Niobium
  • B Boron
  • V, Ti, Nb, and B are optional, containing at least one of them is advantageous since these elements prevent delayed fractures in impact-machined sections of the steel. Too large a content could increase the hardness of the pipe due to nitride that forms from heat treatment, resulting in lower corrosion resistance and toughness and causing fluctuations in strength. In view of these circumstances, V, Ti, and Nb each should be restricted to 0.200% or less, and B to 0.0100% or less. While the desired effects can be obtained at even a tiny quantity of these elements, the content of at least one selected from V, Ti, and Nb is preferably 0.005% or more, and the B content is preferably 0.0005% or more.
  • Ni Ni (Nickel), Cu (Copper), and Ca (Calcium)
  • Ni, Cu, and Ca are optional elements.
  • Ni is an austenite stabilizing element and improves the hot workability of steel. Since too large a content might lower the sulfide stress corrosion cracking resistance, the Ni content is preferably 0.5%. The desired effects, though achievable by a tiny amount of Ni, become obvious when the Ni content is 0.001% or more.
  • Cu is an element for improving the corrosion resistance of the steel.
  • Cu is an austenite stabilizing element as well, which improves the hot workability of steel. Since too large a Cu content, which has a low melting point, is detrimental to the hot workability, the Cu content is preferably 0.25% or less. The desired effects, though achievable by a tiny amount of Cu, become obvious when the Cu content is 0.001% or more.
  • Al which is an optional element is effective as a deoxidizer in the steel. Al is also effective for preventing flaws on the exterior of the pipe. Since too large an Al content could lower the steel purity and cause clogging in the immersion nozzle during continuous casting, the Al content is preferably 0.1%. The desired effects, though achievable by a tiny amount of Al, become obvious when the Al content is 0.001% or more.
  • the method for producing a martensitic stainless steel pipe according to the present invention includes: producing the martensitic stainless steel pipe having the above-described chemical composition; air cooling the outer surface of the pipe down to range of 135 to 175°C; and then cutting the edges of the pipe.
  • the above temperature range is set for the following reasons.
  • the pipe might increase cracks on the edges. Cooling down to below 135°C lowers the cracking susceptibility of the pipe but might cause burrs when cutting, posing the possibility of flaws on the exterior of the pipe during carrying.
  • Billets with the chemical compositions shown in Table 1 were molded and hot-worked with Mannesmann mandrel mill to produce 10 meter long seamless steel pipes each having a various outer diameter i.e. various processing degree of outer diameter. Each pipe was reheated in a furnace at 1050°C for 16 minutes and then air-cooled.
  • the pipes were cut on the edges with the saw blade specified in Table 2 under the conditions specified in Table 3. Each pipe was cut at various temperatures of the pipe outer surface. The cut pipes were evaluated for cracks and burrs in the following manner. The temperature of the outer surface of each pipe was measured with a radiation thermometer.
  • Each pipe was shot blasted to remove scale on the inner and outer surfaces and then pickled. The edges of each pipe were then visually inspected for formation of cracks.
  • Fig. 1 shows crack and burr formations in relation to the degree of outer diameter workability and outer surface temperatures during cutting. As shown, cutting carried out in the temperature range (135 to 175°C) of the present invention was satisfactory with no cracks or burrs.
EP07740291.5A 2006-03-30 2007-03-29 Method for production of martensitic stainless steel pipe Expired - Fee Related EP2003215B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006094737A JP2007270191A (ja) 2006-03-30 2006-03-30 マルテンサイト系ステンレス鋼管の製造方法
PCT/JP2007/056853 WO2007114246A1 (ja) 2006-03-30 2007-03-29 マルテンサイト系ステンレス鋼管の製造方法

Publications (4)

Publication Number Publication Date
EP2003215A2 EP2003215A2 (en) 2008-12-17
EP2003215A9 EP2003215A9 (en) 2009-05-06
EP2003215A4 EP2003215A4 (en) 2013-05-22
EP2003215B1 true EP2003215B1 (en) 2014-08-20

Family

ID=38563514

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07740291.5A Expired - Fee Related EP2003215B1 (en) 2006-03-30 2007-03-29 Method for production of martensitic stainless steel pipe

Country Status (4)

Country Link
EP (1) EP2003215B1 (ja)
JP (1) JP2007270191A (ja)
CN (1) CN101410535B (ja)
WO (1) WO2007114246A1 (ja)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2638873C1 (ru) * 2016-12-26 2017-12-18 Федеральное государственное бюджетное учреждение науки Институт металлургии и материаловедения им. А.А. Байкова Российской академии наук (ИМЕТ РАН) Высокопрочная низколегированная азотосодержащая мартенситная сталь

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0645822B2 (ja) * 1990-04-18 1994-06-15 川崎製鉄株式会社 マルテンサイト系ステンレス鋼管の製造方法
JPH04107213A (ja) * 1990-08-29 1992-04-08 Nippon Steel Corp 空気焼入れ性シームレス鋼管のインライン軟化処理法
CN1069526A (zh) * 1991-08-12 1993-03-03 天津市钢管厂 热穿冷拔双相无缝钢管
US6090230A (en) * 1996-06-05 2000-07-18 Sumitomo Metal Industries, Ltd. Method of cooling a steel pipe
AU739624B2 (en) * 1999-05-18 2001-10-18 Nippon Steel Corporation Martensitic stainless steel for seamless steel pipe
JP4380487B2 (ja) * 2004-09-28 2009-12-09 住友金属工業株式会社 マルテンサイト系ステンレス鋼管の製造方法
CN101981208B (zh) * 2008-03-27 2012-09-05 住友金属工业株式会社 马氏体类不锈钢管的热处理工序用气冷设备

Also Published As

Publication number Publication date
EP2003215A4 (en) 2013-05-22
CN101410535A (zh) 2009-04-15
CN101410535B (zh) 2010-11-03
EP2003215A2 (en) 2008-12-17
EP2003215A9 (en) 2009-05-06
JP2007270191A (ja) 2007-10-18
WO2007114246A1 (ja) 2007-10-11

Similar Documents

Publication Publication Date Title
EP2172573B1 (en) Martensitic stainless-steel seamless pipe for oil well pipe and process for producing the same
EP1236809B1 (en) High-hardness martensitic stainless steel excellent in corrosion resistance
EP3135777B1 (en) Steel for mold and mold
JP4013969B2 (ja) 疲労強度に優れた熱間鍛造品およびその製造方法並びに機械構造部品
JP6784960B2 (ja) マルテンサイト系ステンレス鋼部材
KR101280102B1 (ko) 연속 주조 주조편 및 그 제조 방법
US9200354B2 (en) Rolled steel bar or wire for hot forging
KR20100135205A (ko) 열간가공 공구강 및 이를 이용한 철강제품
EP3287536B1 (en) Martensitic stainless steel
US6793744B1 (en) Martenstic stainless steel having high mechanical strength and corrosion
JP6680142B2 (ja) 高強度継目無油井管およびその製造方法
JP5080708B2 (ja) 非調質鋼鍛造加工品及びその製法、並びにそれを用いた内燃機関用コンロッド部品
JP2005082814A (ja) プラスチック成形金型用プレハードン鋼
JP4396561B2 (ja) 高周波焼入れ用鋼
EP2003215B1 (en) Method for production of martensitic stainless steel pipe
JP5580517B2 (ja) 軟窒化クランクシャフト用素材の製造方法
JP2005336553A (ja) 熱間工具鋼
US11572598B2 (en) Martensite-based stainless steel component and method for manufacturing the same
KR101007417B1 (ko) 다이 캐스트용 열간 공구 강철
JP4975448B2 (ja) 靭性に優れた６５５ＭＰａ級マルテンサイト系ステンレス鋼及びその製造方法
JPH08120345A (ja) 耐食性に優れたマルテンサイト系ステンレス鋼継目無鋼管の製造法
JP2020070473A (ja) 金型用鋼及び金型
JPH08164465A (ja) 少量生産用ダイカスト型用鋼
JPH01180918A (ja) 耐摩耗性にすぐれた継目無鋼管の製造方法
JP2014189853A (ja) ヒートチェックと水冷孔割れを抑制する金型用鋼

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20081016

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR IT

PUAB Information related to the publication of an a document modified or deleted

Free format text: ORIGINAL CODE: 0009199EPPU

RBV Designated contracting states (corrected)

Designated state(s): DE FR IT

DAX Request for extension of the european patent (deleted)
RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: NIPPON STEEL & SUMITOMO METAL CORPORATION

A4 Supplementary search report drawn up and despatched

Effective date: 20130424

RIC1 Information provided on ipc code assigned before grant

Ipc: C22C 38/04 20060101ALI20130418BHEP

Ipc: C21D 8/10 20060101ALI20130418BHEP

Ipc: B21B 23/00 20060101ALI20130418BHEP

Ipc: C22C 38/00 20060101ALI20130418BHEP

Ipc: C21D 8/00 20060101AFI20130418BHEP

Ipc: C22C 38/02 20060101ALI20130418BHEP

Ipc: C21D 9/08 20060101ALI20130418BHEP

RIC1 Information provided on ipc code assigned before grant

Ipc: C21D 8/00 20060101AFI20140124BHEP

Ipc: C22C 38/02 20060101ALI20140124BHEP

Ipc: C22C 38/00 20060101ALI20140124BHEP

Ipc: C21D 8/10 20060101ALI20140124BHEP

Ipc: B21B 23/00 20060101ALI20140124BHEP

Ipc: C22C 38/04 20060101ALI20140124BHEP

Ipc: C22C 38/18 20060101ALI20140124BHEP

Ipc: C21D 9/08 20060101ALI20140124BHEP

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20140319

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR IT

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602007038215

Country of ref document: DE

Effective date: 20141002

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 9

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602007038215

Country of ref document: DE

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20150521

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 10

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 11

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 12

REG Reference to a national code

Ref country code: DE

Ref legal event code: R082

Ref document number: 602007038215

Country of ref document: DE

Representative=s name: DOMPATENT VON KREISLER SELTING WERNER - PARTNE, DE

Ref country code: DE

Ref legal event code: R081

Ref document number: 602007038215

Country of ref document: DE

Owner name: NIPPON STEEL CORPORATION, JP

Free format text: FORMER OWNER: NIPPON STEEL & SUMITOMO METAL CORPORATION, TOKYO, JP

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20200221

Year of fee payment: 14

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210329

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20220203

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20220209

Year of fee payment: 16

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 602007038215

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20230331

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20231003