CN107142420A - A kind of low-temperature steel and its heat treatment method - Google Patents

A kind of low-temperature steel and its heat treatment method Download PDF

Info

Publication number
CN107142420A
CN107142420A CN201710348810.XA CN201710348810A CN107142420A CN 107142420 A CN107142420 A CN 107142420A CN 201710348810 A CN201710348810 A CN 201710348810A CN 107142420 A CN107142420 A CN 107142420A
Authority
CN
China
Prior art keywords
low
temperature
temperature steel
steel
incubated
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.)
Pending
Application number
CN201710348810.XA
Other languages
Chinese (zh)
Inventor
刘成铭
宋年华
李勇
周立明
陈民
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.)
ANHUI HUOSHAN KEWAN SPECIAL CASTING Co Ltd
Original Assignee
ANHUI HUOSHAN KEWAN SPECIAL CASTING Co Ltd
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 ANHUI HUOSHAN KEWAN SPECIAL CASTING Co Ltd filed Critical ANHUI HUOSHAN KEWAN SPECIAL CASTING Co Ltd
Priority to CN201710348810.XA priority Critical patent/CN107142420A/en
Publication of CN107142420A publication Critical patent/CN107142420A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • 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
    • C21D1/26—Methods of annealing
    • C21D1/28—Normalising
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/009—Pearlite

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The invention discloses a kind of low-temperature steel and its heat treatment method, low-temperature steel takes door frame for manufacture, and each group by weight is divided into：C 0.15 0.27%, Si 0.25 0.40%, Mn 0.90 1.50%, S 0.001 0.04%, Mo 0.20 0.40%, P 0.026 0.04%, CE 0.35 0.60%, surplus are Fe.Low temperature tensile strength of steel prepared by the present invention is more than 770MPa, yield strength is more than 600MPa, elongation percentage is more than 18%, the contraction percentage of area is more than 45%, low-temperature impact toughness is more than 35J, with magnetic particle testing cast(ing) surface and near surface flaw, without linear field trash and crackle, with ultrasonic examination casting near surface and internal flaw, the defect such as no shrinkage porosite, shrinkage cavity.

Description

A kind of low-temperature steel and its heat treatment method
Technical field
The invention belongs to casting iron technology field, and in particular to a kind of low-temperature steel and its heat treatment method.
Background technology
Door frame is taken applied to multiple fields such as bus, subway, high ferros, the existing door frame of taking used is welded frequently with No. 35 steel plates Connect, but the shortcoming of such a mode is weld seam occasionally there are crackle in flaw detection, in subsequent heat treatment, deformation is difficult correction, leads Cause production cost high.With taking, door frame application environment is more and more harsher, therefore to taking the tensile strength of door frame, yield strength, prolonging Stretch the performance requirements such as rate and the contraction percentage of area also more and more higher.
The content of the invention
It is an object of the invention to provide a kind of low-temperature steel and its heat treatment method, tensile strength, the surrender of steel are improved Intensity, elongation percentage, the contraction percentage of area and impact flexibility.
In order to realize the purpose of the present invention, adopt the following technical scheme that：
A kind of low-temperature steel, takes door frame, low-temperature steel each group by weight is divided into for manufacturing：C 0.15-0.27%, Si 0.25-0.40%, Mn 0.90-1.50%, S 0.001-0.04%, Mo 0.20-0.40%, P 0.026-0.04%, CE 0.35-0.60%, surplus are Fe.
Preferably, low-temperature steel each group by weight is divided into：C 0.20-0.24%, Si 0.30-0.40%, Mn 1.10- 1.40%th, S 0.001-0.02%, Mo 0.25-0.35%, P 0.027-0.04%, CE 0.40-0.55%, surplus are Fe.
Preferably, low-temperature steel each group by weight is divided into：C 0.210%, Si 0.375%, Mn 1.32%, S 0.0042%th, Mo 0.27%, P 0.0281%, CE 0.5075%, surplus are Fe.
The heat treatment method of low-temperature steel, comprises the following steps：(1) each component is mixed, carries out normalized treatment, normalizing temperature For 860-930 DEG C, 1.5-3h is incubated；(2) Quenching Treatment is carried out, hardening heat is 520-560 DEG C, is incubated 3h；(3) it is tempered Processing, temperature is 200-250 DEG C and is incubated 2h, then natural cooling.
Preferably, the heat treatment method of low-temperature steel comprises the following steps：(1) each component is mixed, carries out normalized treatment, just Fiery temperature is 910 DEG C, is incubated 2h；(2) Quenching Treatment is carried out, hardening heat is 550 DEG C, is incubated 3h；(3) temper is carried out, Temperature is 220 DEG C and is incubated 2h, then natural cooling.
Compared with prior art, beneficial effects of the present invention：
The metallographic structure of low-temperature steel prepared by the present invention be superfine small ferrite and pearlite plus substantial amounts of troostite and Sorbite, the manganese of addition improves the intensity, hardness and wearability of steel by being solid-solution in ferrite and refinement pearlite, and manganese can be with Improving the quenching degree of steel by being heat-treated improves the mechanical property of steel；The addition of a small amount of molybdenum can improve the quenching degree of steel, by solid It is dissolved in matrix and strengthens matrix, can be partly dissolved in other hardening phases to improve the mechanical property of hardening phase.It is prepared by the present invention Low temperature tensile strength of steel be more than 770MPa, yield strength be more than 600MPa, elongation percentage be more than 18%, the contraction percentage of area is more than 45%, (- 48 DEG C) of low-temperature impact toughness is more than 35J, and with magnetic particle testing cast(ing) surface and near surface flaw, nothing is linearly mingled with Thing and crackle, with ultrasonic examination casting near surface and internal flaw, the defect such as no shrinkage porosite, shrinkage cavity.
Embodiment
Embodiments of the invention are elaborated below, the present embodiment is carried out lower premised on technical solution of the present invention Implement, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to following implementations Example.
Embodiment 1
A kind of low-temperature steel, takes door frame, low-temperature steel each group by weight is divided into for manufacturing：C 0.228%, Si 0.329%th, Mn 1.24%, S 0.0099%, Mo 0.31%, P 0.0311%, CE 0.46%, surplus are Fe.
The heat treatment method of low-temperature steel comprises the following steps：(1) each component is mixed, carries out normalized treatment, normalizing temperature For 910 DEG C, 2h is incubated；(2) Quenching Treatment is carried out, hardening heat is 550 DEG C, is incubated 3h；(3) temper, tempering temperature are carried out Spend for 220 DEG C and be incubated 2h, then natural cooling.
The difference of following examples and embodiment 1 is,
Embodiment 2
A kind of low-temperature steel, takes door frame, low-temperature steel each group by weight is divided into for manufacturing：C 0.21%, Si 0.375%, Mn 1.32%, S 0.0042%, Mo 0.27%, P 0.0271%, CE 0.5075%, surplus are Fe.
Embodiment 3
A kind of low-temperature steel, takes door frame, low-temperature steel each group by weight is divided into for manufacturing：C 0.209%, Si 0.389%th, Mn 1.35%, S 0.0057%, Mo 0.37%, P 0.0327%, CE 0.5175%, surplus are Fe.
Embodiment 4
A kind of low-temperature steel, takes door frame, low-temperature steel each group by weight is divided into for manufacturing：C 0.224%, Si 0.347%th, Mn 1.36%, S 0.001%, Mo 0.29%, P 0.0335%, CE 0.4748%, surplus are Fe.
Embodiment 5
A kind of low-temperature steel, takes door frame, low-temperature steel each group by weight is divided into for manufacturing：C 0.224%, Si 0.358%th, Mn 1.18%, S 0.0053%, Mo 0.27%, P 0.0292%, CE 0.4432%, surplus are Fe.
Tensile strength, yield strength, elongation percentage, the contraction percentage of area and the impact of low-temperature steel prepared by the various embodiments described above Toughness (- 48 DEG C) etc. has carried out related assays, and specific experimental result is as follows：
Group number Tensile strength/MPa Yield strength/MPa Elongation percentage/% The contraction percentage of area/% Impact flexibility (- 48 DEG C)/(J/cm2)
Embodiment 1 810 642 20.2 53.9 49
Embodiment 2 798.45 663.27 19.78 50.04 44.7
Embodiment 3 790.22 673.1 21.34 60.1 47
Embodiment 4 776.27 608.64 19.5 56.4 39
Embodiment 5 784.45 652.14 19.20 47.91 36
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention Any modifications, equivalent substitutions and improvements made within refreshing and principle etc., should be included in the scope of the protection.

Claims (5)

1. a kind of low-temperature steel, takes door frame, it is characterised in that low-temperature steel each group by weight is divided into for manufacturing：C 0.15- 0.27%th, Si 0.25-0.40%, Mn 0.90-1.50%, S 0.001-0.04%, Mo 0.20-0.40%, P 0.026- 0.04%th, CE 0.35-0.60%, surplus are Fe.
2. low-temperature steel according to claim 1, it is characterised in that low-temperature steel each group by weight is divided into：C 0.20- 0.24%th, Si 0.30-0.40%, Mn 1.10-1.40%, S 0.001-0.02%, Mo 0.25-0.35%, P 0.027- 0.04%th, CE 0.40-0.55%, surplus are Fe.
3. low-temperature steel according to claim 1, it is characterised in that low-temperature steel each group by weight is divided into：C 0.210%th, Si 0.375%, Mn 1.32%, S 0.0042%, Mo 0.27%, P 0.0281%, CE 0.5075%, surplus For Fe.
4. the heat treatment method of low-temperature steel according to claim 1, it is characterised in that comprise the following steps：(1) by each group Divide mixing, carry out normalized treatment, normalizing temperature is 860-930 DEG C, is incubated 1.5-3h；(2) Quenching Treatment is carried out, hardening heat is 520-560 DEG C, it is incubated 3h；(3) temper is carried out, temperature is 200-250 DEG C and is incubated 2h, then natural cooling.
5. the heat treatment method of low-temperature steel according to claim 4, it is characterised in that comprise the following steps：(1) by each group Divide mixing, carry out normalized treatment, normalizing temperature is 910 DEG C, is incubated 2h；(2) Quenching Treatment is carried out, hardening heat is 550 DEG C, is protected Warm 3h；(3) temper is carried out, temperature is 220 DEG C and is incubated 2h, then natural cooling.
CN201710348810.XA 2017-05-17 2017-05-17 A kind of low-temperature steel and its heat treatment method Pending CN107142420A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710348810.XA CN107142420A (en) 2017-05-17 2017-05-17 A kind of low-temperature steel and its heat treatment method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710348810.XA CN107142420A (en) 2017-05-17 2017-05-17 A kind of low-temperature steel and its heat treatment method

Publications (1)

Publication Number Publication Date
CN107142420A true CN107142420A (en) 2017-09-08

Family

ID=59778143

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710348810.XA Pending CN107142420A (en) 2017-05-17 2017-05-17 A kind of low-temperature steel and its heat treatment method

Country Status (1)

Country Link
CN (1) CN107142420A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108486452A (en) * 2018-03-26 2018-09-04 江苏翔晟重工有限公司 A kind of manufacturing method of low-temperature steel peculiar to vessel

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101024870A (en) * 2006-02-24 2007-08-29 南阳二机石油装备(集团)有限公司 Low-temperature high-strength, high-toughness steel and preparing method therefor
CN101270443A (en) * 2007-03-19 2008-09-24 上海市机械制造工艺研究所 Novel casting alloy material for lockset medial axis components for manufacturing container
CN103131962A (en) * 2011-11-29 2013-06-05 中国科学院金属研究所 High-tenacity low-alloy high-strength steel and quenched-tempered heat treatment method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101024870A (en) * 2006-02-24 2007-08-29 南阳二机石油装备(集团)有限公司 Low-temperature high-strength, high-toughness steel and preparing method therefor
CN101270443A (en) * 2007-03-19 2008-09-24 上海市机械制造工艺研究所 Novel casting alloy material for lockset medial axis components for manufacturing container
CN103131962A (en) * 2011-11-29 2013-06-05 中国科学院金属研究所 High-tenacity low-alloy high-strength steel and quenched-tempered heat treatment method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
徐峰: "《焊接工艺简明手册》", 30 September 2014 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108486452A (en) * 2018-03-26 2018-09-04 江苏翔晟重工有限公司 A kind of manufacturing method of low-temperature steel peculiar to vessel

Similar Documents

Publication Publication Date Title
CN1888116B (en) High hardness and high wear resistance no-magnetism bearing steel and its preparation method
JP2006009141A (en) Electric resistance welded tube having excellent cold workability and hardenability and its production method
CN106222544B (en) Annular forging piece and its heat treatment method
CN104451408B (en) Strong bainitic steel of carbon superelevation and preparation method thereof in one
CN105039862B (en) Co-free complex intensifyings Secondery-hardening Ultrahigh Strength Steel and preparation method
CN107557548B (en) The heterogeneous reinforced low-alloy super-high strength steel organizational controls method of martensite+granular bainite
CN104073736A (en) 10Ni10Co high-toughness secondary-hardening ultrahigh-strength steel and preparation method thereof
JP4983082B2 (en) High-strength steel and manufacturing method thereof
CN107326302A (en) A kind of anti-corrosion bainitic steel, rail and preparation method
CN111020405A (en) High-strength steel plate for pressurized water reactor nuclear power station containment shell head and manufacturing method thereof
CN104911499B (en) Cu strengthens Co free Secondery-hardening Ultrahigh Strength Steels and preparation method
CN105063311A (en) Processing method for improving surface quality of TRIP steel
EP2215280B1 (en) High tensile steel for deep drawing and manufacturing method thereof
CN104357747A (en) Microalloyed manganese boron alloy steel as well as thermal treatment method and application thereof
CN101603156B (en) Manufacture method for manufacturing cantilever steel pipe with high strength and high toughness by using hot-rolling coiled plate
CN107761007A (en) Strong dual phase steel of low-carbon cold rolling superelevation and preparation method thereof
CN108950150A (en) Manganese Q&P steel heat treatment process in superhigh intensity cold rolling based on complete austenitizing
CN110172636A (en) A kind of low-carbon hot forming steel and preparation method thereof
CN107142420A (en) A kind of low-temperature steel and its heat treatment method
CN108165883A (en) 20crmnmo steel and its processing method
CN108546871B (en) Steel for integrated reactor top assembly of nuclear power unit and manufacturing method thereof
CN105039851B (en) Ti Alloying TAM steel and its manufacture method
CN115627423B (en) 1600 MPa-grade hot rolled coil and production method thereof
CN101619412A (en) Intrinsic non-net secondary cementite steel and application method thereof
CN107287509A (en) A kind of 550MPa grades of nuclear power voltage-stablizer equipment steel and its manufacture method

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20170908