CN109055863A - A kind of the low-carbon alloy Steel material and heat treatment method of oil drilling hook - Google Patents

A kind of the low-carbon alloy Steel material and heat treatment method of oil drilling hook Download PDF

Info

Publication number
CN109055863A
CN109055863A CN201811087358.7A CN201811087358A CN109055863A CN 109055863 A CN109055863 A CN 109055863A CN 201811087358 A CN201811087358 A CN 201811087358A CN 109055863 A CN109055863 A CN 109055863A
Authority
CN
China
Prior art keywords
low
carbon alloy
alloy steel
steel
hook
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
CN201811087358.7A
Other languages
Chinese (zh)
Inventor
刘琼
袁远刚
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.)
Sinopec Oilfield Equipment Corp
Sinopec Siji Petroleum Machinery Co Ltd
Original Assignee
Sinopec Oilfield Equipment Corp
Sinopec Siji Petroleum Machinery 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 Sinopec Oilfield Equipment Corp, Sinopec Siji Petroleum Machinery Co Ltd filed Critical Sinopec Oilfield Equipment Corp
Priority to CN201811087358.7A priority Critical patent/CN109055863A/en
Publication of CN109055863A publication Critical patent/CN109055863A/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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
    • 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
    • C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
    • C21D3/02—Extraction of non-metals
    • C21D3/04—Decarburising
    • 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
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
    • 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
    • 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
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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
    • C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
    • 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
    • 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
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten

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 Articles (AREA)

Abstract

The trade mark of a kind of low-carbon alloy Steel material of oil drilling hook, the cast steel low-carbon alloy steel is ZG25CrNiMo, and each chemical component is by weight percentage are as follows: carbon 0.22 ~ 0.30%, silicon 0.40 ~ 0.70%, manganese 0.60 ~ 1.00%.Chromium 0.75 ~ 1.00, nickel 0.40 ~ 0.70%, molybdenum 0.25 ~ 0.35%, phosphorus≤0.025%, sulphur≤0.025%, copper≤0.30%, surplus are iron.Heat treatment method are as follows: diffusion annealing processing :+high temperature normalizing processing+modifier treatment.There is the present invention excellent intensity and toughness to combine, and solve the problems, such as that poor hook coupler body cast product comprehensive performance, high tenacity and high-wearing feature cannot get both.

Description

A kind of the low-carbon alloy Steel material and heat treatment method of oil drilling hook
Technical field
The invention belongs to Parts of Petroleum Machinery materials, are related specifically to well drilling hoisting system hook low-carbon alloy steel Material and heat treatment method.
Background technique
Drilling well hoisting hook is the important component in oil drilling, for promoting drilling rod with conveying drilling fluid, due to Its promotion load is big, and up and down, receiving alternate stress is needed repeatedly in operation, and operating condition is extremely severe, it is prone to which fatigue is split Line destroys, and causes serious safety accident.In order to guarantee the safety of product, it is desirable that hoisting system of rig hook material is having While higher-strength, also there are good plasticity and toughness properties, it is necessary to meet API 8C standard.
Conventional lift systems suspension hook is very high to comprehensive mechanical property index request since safety coefficient is very high, it is desirable that even tissue It is fine and closely woven, generally use steel alloy forged material.And oil drilling hook is bulky, and it is complex-shaped, it is difficult to adopt forging technology, Casting material can only be used, this just needs that suitable low-carbon alloy steel is selected to realize desired height by specific heat treatment method Strong high tenacity performance.Ordinary carbon steel or steel alloy are generallyd use both at home and abroad at present, since cast structure is coarse, material fragility is big, The problem of generally existing toughness deficiency, it is necessary to the deficiency of material property is made up by subsequent heat treatment.
Summary of the invention
The object of the present invention is to provide a kind of well drilling hoisting system hook coupler body casting low-carbon alloy Steel material and There is excellent intensity and toughness to combine for heat treatment method, the material, solve that hook coupler body cast product comprehensive performance is poor, high-ductility The problem of property and high-wearing feature cannot get both.
To achieve the above object, the technical solution of the present invention is as follows:
A kind of low-carbon alloy Steel material of oil drilling hook, it is characterised in that: the trade mark of the cast steel low-carbon alloy steel is ZG25CrNiMo, each chemical component is by weight percentage are as follows: carbon 0.22 ~ 0.30%, silicon 0.40 ~ 0.70%, manganese 0.60 ~ 1.00%.Chromium 0.75 ~ 1.00, nickel 0.40 ~ 0.70%, molybdenum 0.25 ~ 0.35%, phosphorus≤0.025%, sulphur≤0.025%, copper≤0.30%, surplus is iron.
A kind of low-carbon alloy steel material heat treatment method of oil drilling hook, it is characterised in that:
Method includes the following steps:
(1) diffusion annealing is handled: low-carbon alloy steel hook casting to be processed being put into heating furnace, is heated to 940 ± 10 DEG C Heat preservation cools to 300 DEG C of taking-ups with the furnace after 4-5 hours and cools down in air.
(2) high temperature normalizing is handled: the low-carbon alloy steel hook casting that step 1 processing is completed being put into heating furnace, is heated To 900 ± 10 DEG C, 4-5 hours are kept the temperature after steel alloy internal and external temperature reaches consistent, it is then air-cooled.
(3) modifier treatment: the low-carbon alloy steel hook casting that step 2 processing is completed is put into heating furnace, is heated to 870 ± 10 DEG C, 3.5-4 hours are kept the temperature after steel alloy internal and external temperature reaches consistent, takes out 1-1.5 points of pre-cooling in air then water cooling 1.5-2 point places into quenching oil and is cooled to 120 DEG C or so of surface and places into tempering furnace, 680-720 DEG C is heated to, wait close Heat preservation 6-7 hours, then takes out air-cooled after golden steel internal and external temperature reaches consistent.
The invention has the following outstanding advantages:
(1) low-carbon alloy steel ZG25CrNiMo material of the invention, at diffusion annealing+high temperature normalizing+modifier treatment heat Reason method obtains tempered sorbite tissue, and material is made to be provided simultaneously with higher intensity and higher toughness；
(2) due to after material heat treatment even tissue it is fine and closely woven, tissue rank after fully achieving forging solves complicated big Type component can not forge, and the technical problem of mechanical property requirements is not achieved using casting.
Specific embodiment
Below with reference to embodiment, embodiments of the present invention are described further.
Embodiment 1
The founding materials of one block of ZG25CrNiMo steel alloy are chosen, the main component of the steel is shown in Table 2, is diffused to alloy cast steel Annealing+high temperature normalizing+modifier treatment, compares its intensity and impact property
The chemical component (mass percent %) of 2 ZG25CrNiMo steel alloy of table
Grade of steel C Si Mn Cr Ni Mo P S Cu Fe
ZG25CrNiMo 0.28 0.55 0.80 0.85 0.60 0.25 0.015 0.0020 0.3 Surplus
Heat treatment process is as follows:
(1) ZG25CrNiMo low-carbon alloy steel cast steel sample to be processed is put into heating furnace and is diffused annealing, added Heat carries out 4 ~ 5h of heat preservation to 940 DEG C, and subsequent blowing out is cooled to room temperature to 300 DEG C hereinafter, taking out in air.
(2) the ZG25CrNiMo low-carbon alloy steel cast steel sample after diffusion annealing is put into heating furnace, is heated to 900 DEG C It keeps the temperature 4h and carries out high temperature normalizing.
(3) the ZG25CrNiMo low-carbon alloy steel cast steel sample after high temperature normalizing is put into heating furnace, is heated to 870 DEG C Rapid cooling in water is taken out after heat preservation 3h to be quenched.
(4) quenched ZG25CrNiMo low-carbon alloy steel cast steel sample is put into heating furnace, is heated to 700 DEG C of heat preservations Rapid cooling in water is taken out after 5h carries out high tempering processing.Then 3 impact toughness samples and 3 strength specimens are taken respectively, it is real It tests data and is shown in Table 4.
4 embodiment of table, 1 intensity and plasticity and toughness experimental result
Test piece number (Test pc No.) Tensile strength Rm (MPa) Yield strength Rel (MPa) Elongation percentage A % Contraction percentage of area Z % - 45 DEG C of Charpy impact Akv (J)
1# 710 520 18 52 36
2# 680 500 20 55 40
3# 690 505 20 54 42
API 8C technical indicator 620 415 18 35 27
Embodiment 2
The steel of one piece of ZG25CrNiMo low-carbon alloy steel are chosen, the main component of the steel is shown in Table 5.Alloy cast steel is diffused Annealing+high temperature normalizing+modifier treatment, compares its intensity and impact property
The chemical component (mass percent %) of 5 ZG25CrNiMo steel alloy of table
Grade of steel C Si Mn Cr Ni Mo P S Cu Fe
ZG25CrNiMo 0.26 0.4 0.6 1.0 0.7 0.30 0.025 0.0020 0.2 Surplus
Heat treatment process is as follows:
(1) ZG25CrNiMo low-carbon alloy steel cast steel sample to be processed is put into heating furnace and is diffused annealing by (1), It is heated to 940 DEG C and carries out 4 ~ 5h of heat preservation, subsequent blowing out is cooled to room temperature to 300 DEG C hereinafter, taking out in air.
(2) the ZG25CrNiMo low-carbon alloy steel cast steel sample after diffusion annealing is put into heating furnace, is heated to 910 DEG C It keeps the temperature 4h and carries out high temperature normalizing.
(3) the ZG25CrNiMo low-carbon alloy steel cast steel sample after high temperature normalizing is put into heating furnace, is heated to 860 DEG C Rapid cooling in water is taken out after heat preservation 3h to be quenched.
(4) quenched ZG25CrNiMo low-carbon alloy steel cast steel sample is put into heating furnace, is heated to 690 DEG C of heat preservations Rapid cooling in water is taken out after 5h carries out high tempering processing.Then 3 impact toughness samples and 3 strength specimens are taken respectively, it is real It tests data and is shown in Table 7.
7 embodiment of table, 2 intensity and plasticity and toughness experimental result
Test piece number (Test pc No.) Tensile strength Rm (MPa) Yield strength Rel (MPa) Elongation percentage A % Contraction percentage of area Z % - 45 DEG C of Charpy impact Akv (J)
1# 720 540 18 50 38
2# 690 510 19 54 42
3# 705 500 19 55 40
API 8C technical indicator 620 415 18 35 27
Embodiment 3
The steel of one piece of ZG25CrNiMo low-carbon alloy steel are chosen, the main component of the steel is shown in Table 8.Alloy cast steel is diffused Annealing+high temperature normalizing+modifier treatment, compares its intensity and impact property
The chemical component (mass percent %) of 8 ZG25CrNiMo steel alloy of table
Grade of steel C Si Mn Cr Ni Mo P S Cu Fe
ZG25CrNiMo 0.22 0.7 1.0 0.75 0.4 0.35 0.010 0.0020 0.1 Surplus
Heat treatment process is as follows:
(1) ZG25CrNiMo low-carbon alloy steel cast steel sample to be processed is put into heating furnace and is diffused annealing, added Heat carries out 4 ~ 5h of heat preservation to 930 DEG C, and subsequent blowing out is cooled to room temperature to 300 DEG C hereinafter, taking out in air.
(2) the ZG25CrNiMo low-carbon alloy steel cast steel sample after diffusion annealing is put into heating furnace, is heated to 910 DEG C It keeps the temperature 4h and carries out high temperature normalizing.
(3) the ZG25CrNiMo low-carbon alloy steel cast steel sample after high temperature normalizing is put into heating furnace, is heated to 870 DEG C Rapid cooling in water is taken out after heat preservation 3h to be quenched.
(4) quenched ZG25CrNiMo low-carbon alloy steel cast steel sample is put into heating furnace, is heated to 710 DEG C of heat preservations Rapid cooling in water is taken out after 5h carries out high tempering processing.Then 3 impact toughness samples and 3 strength specimens are taken respectively, it is real It tests data and is shown in Table 10.
10 embodiment of table, 3 intensity and plasticity and toughness experimental result
Test piece number (Test pc No.) Tensile strength Rm (MPa) Yield strength Rel (MPa) Elongation percentage A % Contraction percentage of area Z % - 45 DEG C of Charpy impact Akv (J)
1# 715 550 18 50 40
2# 680 505 20 55 45
3# 690 510 19 52 38
API 8C technical indicator 620 415 18 35 27
In summary three embodiments, from the data of table 4, table 7 and table 10 can be seen that by 940 ± 10 DEG C of diffusion annealings+ The sample of+680-720 DEG C of temperings of 900 ± 10 DEG C of normalizing+870 ± 10 DEG C quenchings, yield strength (Rel), tensile strength (Rm), elongation percentage (A), -29 DEG C of ballistic works (Akv), all mechanical performance indexs all reach API 8C technical requirement.
It is related in the structural transformation that 420 ± 10 DEG C of temperature tempering occur after steel alloy carburizing and quenching, 420 ± 10 DEG C of tempering The sample of processing, the cemetite lamellae quantity being precipitated from martensite is more and nodularization takes place, and a phase starts to reply.Through X-ray And scanning electron microscope analysis, organize the mixture formed for fine acicular ferrite and granuliform carbide, i.e. secondary troostite.
The above is only non-limiting embodiment of the invention, for those of ordinary skill in the art, not Under the premise of being detached from the invention design and not making creative work, various modifications and improvements can be made, these are all It belongs to the scope of protection of the present invention.

Claims (2)

1. a kind of low-carbon alloy Steel material of oil drilling hook, it is characterised in that: the trade mark of the cast steel low-carbon alloy steel is ZG25CrNiMo, each chemical component is by weight percentage are as follows: carbon 0.22 ~ 0.30%, silicon 0.40 ~ 0.70%, manganese 0.60 ~ 1.00%, chromium 0.75 ~ 1.00, nickel 0.40 ~ 0.70%, molybdenum 0.25 ~ 0.35%, phosphorus≤0.025%, sulphur≤0.025%, copper≤0.30%, surplus is iron.
2. a kind of low-carbon alloy steel material heat treatment method of oil drilling hook, it is characterised in that:
Method includes the following steps:
(1) diffusion annealing is handled: low-carbon alloy steel hook casting to be processed being put into heating furnace, is heated to 940 ± 10 DEG C Heat preservation cools to 300 DEG C of taking-ups with the furnace after 4-5 hours and cools down in air；
(2) high temperature normalizing is handled: the low-carbon alloy steel hook casting that step 1 processing is completed being put into heating furnace, is heated to 900 ± 10 DEG C, 4-5 hours are kept the temperature after steel alloy internal and external temperature reaches consistent, it is then air-cooled；
(3) modifier treatment: the low-carbon alloy steel hook casting that step 2 processing is completed is put into heating furnace, is heated to 870 ± 10 DEG C, 3.5-4 hours are kept the temperature after steel alloy internal and external temperature reaches consistent, takes out 1-1.5 points of pre-cooling in air then water cooling 1.5-2 point places into quenching oil and is cooled to 120 DEG C or so of surface and places into tempering furnace, 680-720 DEG C is heated to, wait close Heat preservation 6-7 hours, then takes out air-cooled after golden steel internal and external temperature reaches consistent.
CN201811087358.7A 2018-09-18 2018-09-18 A kind of the low-carbon alloy Steel material and heat treatment method of oil drilling hook Pending CN109055863A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811087358.7A CN109055863A (en) 2018-09-18 2018-09-18 A kind of the low-carbon alloy Steel material and heat treatment method of oil drilling hook

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811087358.7A CN109055863A (en) 2018-09-18 2018-09-18 A kind of the low-carbon alloy Steel material and heat treatment method of oil drilling hook

Publications (1)

Publication Number Publication Date
CN109055863A true CN109055863A (en) 2018-12-21

Family

ID=64762996

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811087358.7A Pending CN109055863A (en) 2018-09-18 2018-09-18 A kind of the low-carbon alloy Steel material and heat treatment method of oil drilling hook

Country Status (1)

Country Link
CN (1) CN109055863A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111434589A (en) * 2019-01-11 2020-07-21 宝山钢铁股份有限公司 Wear-resistant alloy steel scraper tooth and assembly thereof
CN111534762A (en) * 2020-06-12 2020-08-14 铁科（北京）轨道装备技术有限公司 Wear-resistant steel and heat treatment process and preparation method thereof
CN111850246A (en) * 2020-06-30 2020-10-30 锦州捷通铁路机械股份有限公司 Heat treatment method for improving elongation after fracture of C-grade steel

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60138055A (en) * 1983-12-26 1985-07-22 Daido Steel Co Ltd Material for tool joint and drill collar
CN105714042A (en) * 2014-12-05 2016-06-29 重庆永林机械设备有限公司 Steel casting heat treatment technology
CN106011396A (en) * 2016-07-08 2016-10-12 杭州汽轮铸锻有限公司 Quenching method for improving mechanical property of large forging

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60138055A (en) * 1983-12-26 1985-07-22 Daido Steel Co Ltd Material for tool joint and drill collar
CN105714042A (en) * 2014-12-05 2016-06-29 重庆永林机械设备有限公司 Steel casting heat treatment technology
CN106011396A (en) * 2016-07-08 2016-10-12 杭州汽轮铸锻有限公司 Quenching method for improving mechanical property of large forging

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
彭松涛 等: "铸造ZG25CrNiMo游车吊钩的熔炼工艺", 《铸造技术》 *
闵艳平: "钩体力学性能不合格原因分析及防止措施", 《金属加工（热加工）》 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111434589A (en) * 2019-01-11 2020-07-21 宝山钢铁股份有限公司 Wear-resistant alloy steel scraper tooth and assembly thereof
CN111534762A (en) * 2020-06-12 2020-08-14 铁科（北京）轨道装备技术有限公司 Wear-resistant steel and heat treatment process and preparation method thereof
CN111850246A (en) * 2020-06-30 2020-10-30 锦州捷通铁路机械股份有限公司 Heat treatment method for improving elongation after fracture of C-grade steel

Similar Documents

Publication Publication Date Title
US7074283B2 (en) Low alloy steel
CN108517461B (en) High-performance martensitic stainless steel flange and manufacturing method thereof
JP5251872B2 (en) Non-tempered steel for hot forging and hot-rolled steel with excellent fracture separation and machinability, and hot-forged non-tempered steel parts
CN107937828B (en) F6NM martensitic stainless steel cylinder forging and heat treatment method
CN101831595B (en) Rapid cooling thermal treatment method of 21/4Cr-1Mo-1/4V steel forging and automatic temperature-control inflation three-dimensional circulating water
US9624559B2 (en) Bearing steel excellent in rolling-contact fatigue properties and method for producing same
CN109055863A (en) A kind of the low-carbon alloy Steel material and heat treatment method of oil drilling hook
RU2270873C1 (en) Method of production of skelp steel for pipes of underwater sea gas pipe lines of high parameters
US20240052470A1 (en) Non-quenched and Tempered Round Steel with High Strength, High Toughness and Easy Cutting and Manufacturing Method Therefor
CN111270132B (en) Stainless steel for pressure-bearing material of petroleum and natural gas drilling equipment and preparation method thereof
CN114107839A (en) Low-alloy cast steel, heat treatment method thereof and application thereof in railway industry
CN109207693A (en) A method of improving quenched and tempered state low-alloy nodular bainite steel impact flexibility
WO2017115842A1 (en) Case-hardened steel, carburized component, and process for producing case-hardened steel
CN110358971A (en) A kind of yield strength 1300MPa grades low-carbon super-high strength steel and preparation method thereof
CN1330789C (en) 600MPa grade low temperature high toughness weather corrosion resistant steel and its production method
CN110791641B (en) Preparation method of bevel gear made of 18CrNiMo7-6 material
CN103572176B (en) A kind of low-carbon martensitic steels and prepare the method for suspension ring
CN104131227B (en) A kind of Mayari steel pipe and manufacture method
JP4959471B2 (en) High strength seamless steel pipe with excellent toughness for machine structure and manufacturing method thereof
CN110205541B (en) X65-grade high-toughness microbial corrosion-resistant pipeline steel and preparation method thereof
CN106521310B (en) A kind of quartering hammer piston rod steel and its Technology for Heating Processing
KR100957306B1 (en) Forging steel using high frequency heat treatment and method for manufacturing the same
CN112853049B (en) High-performance shaft sleeve material and heat treatment method thereof
CN115584431A (en) High-performance anti-collapse casing pipe for shale gas well and machining method
CN104294014B (en) The bainite isothermal heat treatment method of middle carbon silicomanganese chromium nickel series low-alloy steel

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
WD01 Invention patent application deemed withdrawn after publication
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20181221