CN104404374A - Tensile resistant PC steel rod and heat treatment method - Google Patents

Tensile resistant PC steel rod and heat treatment method Download PDF

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Publication number
CN104404374A
CN104404374A CN201410622568.7A CN201410622568A CN104404374A CN 104404374 A CN104404374 A CN 104404374A CN 201410622568 A CN201410622568 A CN 201410622568A CN 104404374 A CN104404374 A CN 104404374A
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rod iron
tension
surplus
earth
weight percentage
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CN201410622568.7A
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CN104404374B (en
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姚圣法
吴海洋
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JIANGSU TIANSHUN METAL MATERIAL GROUP CO Ltd
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    • 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
    • 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
    • C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
    • 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
    • C22C38/04—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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • 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
    • C21D2211/008—Martensite

Abstract

The invention relates to a tensile resistant PC steel rod, which comprises the following components in percentage by weight: 0.68 to 0.83% of C, 1.32 to 1.65% of Si, 0.21 to 0.28% of Mn, 0.30 to 0.60% of Cr, 0.05 to 0.075% of Mo, 0.05 to 0.3% of V, 0.007 to 0.013% of Nb, 1.10 to 1.35% of composite rare earth, not more than 0.02% of P, not more than 0.02% of S, less than 0.15% of Cu, and the balance being Fe and inevitable other trace impurities. Through the adjustment on chemical components and improvement on heat treatment technology, the mechanical properties of the steel rod are excellent: the yield strength is bigger than 1900 MPa, the tensile strength is greater than 2200 MPa, the maximal total elongation rate is larger than 2.5%, and the hardness from the core to the surface are all larger than 60 HRC. Moreover, the steel rod has the characteristics of good welding property, simple heat treatment technology, and easiness for massive production.

Description

A kind of tension PC rod iron and heat treating method thereof
Technical field
The present invention relates to a kind of low-carbon alloy steel and thermal treatment process thereof, a kind of tension PC rod iron and heat treating method thereof, belong to Metal smelting and technical field of heat treatment technology thereof specifically.
Background technology
Steel bar for prestressed concrete is called for short PC rod iron, it is the prestressing steel that a kind of technology content of being developed the sixties in 20th century by Japanese Neturen Co., Ltd. is very high, due to it have high strength toughness, underrelaxation, with grip of concrete strong, good weldability, upsetting, save the feature such as material, be widely used in high-strength with stress or solidifying native centrifugal pile tube, electric pole, overhead bridge pier, railroad sleeper etc. in prestressed component abroad.
According to existing GB GB/T5223.3-2005, the material composition of PC rod is not clearly defined, only list the current mechanical property that can reach, comprising the maximum tensile strength is 1570MPa, yield strength is 1420MPa to the maximum, maximum, force percentage of total elongation is greater than 3.5%, elongation after fracture under being greater than 7.0% and 1000h minimum lax value be 2.0 (when initial stress is 70% of tensile strength).It can thus be appreciated that optimization composition and improving technique can also make the mechanical property of PC rod go another step.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the shortcoming of prior art, provides a kind of tension PC rod iron and heat treating method thereof, by adjustment chemical composition, improves heat treatment process parameter and makes the PC rod iron mechanical property of production remarkable.
In order to solve above technical problem, the invention provides a kind of tension PC rod iron, the composition that described rod iron comprises and weight percentage thereof are: C:0.68-0.83%, Si:1.32-1.65%, Mn:0.21-0.28%, Cr:0.30-0.60%, Mo:0.05-0.075%, V:0.05-0.3%, Nb:0.007-0.013%, compound rare-earth: 1.10 ~ 1.35%, P, S content are not more than 0.02%, Cu is less than 0.15%, and surplus is iron and other trace impurities inevitable.
Further restriction technical scheme of the present invention, aforesaid tension PC rod iron, in described compound rare-earth, comprises following component: Ce:12 ~ 16% by weight percentage, Sc:11 ~ 13%, Gd:2 ~ 5%, Sm:1 ~ 3%, Dy:1 ~ 2%, Pr:15 ~ 23%, surplus is La.
Aforesaid tension PC rod iron, the microstructure of described rod iron is the tempered martensite that volume fraction is greater than 96%.
Aforesaid tension PC rod iron, the composition that described rod iron comprises and weight percentage thereof are: C:0.68%, Si:1.32%, Mn:0.21%, Cr:0.30%, Mo:0.05%, V:0.05%, Nb:0.007%, compound rare-earth: 1.10%, P, S content is less than 0.015%, Cu and is less than 0.10%, and surplus is iron and other trace impurities inevitable;
In described compound rare-earth, comprise following component by weight percentage: Ce:12%, Sc:11%, Gd:2%, Sm:1%, Dy:1%, Pr:15%, surplus is La.
Aforesaid tension PC rod iron, the composition that described rod iron comprises and weight percentage thereof are: C:0.73%, Si:1.45%, Mn:0.25%, Cr:0.46%, Mo:0.065%, V:0.093%, Nb:0.0085%, compound rare-earth: 1.25%, P, S content is not more than 0.02%, Cu and is less than 0.15%, and surplus is iron and other trace impurities inevitable;
In described compound rare-earth, comprise following component by weight percentage: Ce:14%, Sc:12%, Gd:3%, Sm:2%, Dy:2%, Pr:18%, surplus is La.
Aforesaid tension PC rod iron, the composition that described rod iron comprises and weight percentage thereof are: C:0.83%, Si:1.65%, Mn:0.28%, Cr:0.60%, Mo:0.075%, V:0.3%, Nb:0.013%, compound rare-earth: 1.35%, P, S content is not more than 0.01%, Cu and is less than 0.12%, and surplus is iron and other trace impurities inevitable;
In described compound rare-earth, comprise following component by weight percentage: Ce:16%, Sc:13%, Gd:5%, Sm:3%, Dy:2%, Pr:23%, surplus is La.
For a heat treating method for tension PC rod iron, comprise the following steps:
By rod iron through induction heating to 1100-1250 DEG C, after making rod iron complete austenitizing, shrend immediately cooling to obtain full martensitic stucture,
(2) after rod iron shrend completes, at the temperature of 180-250 DEG C, carry out low-temperaturetempering process, final acquisition microstructure is the product of tempered martensite.
The heat treating method of aforesaid tension PC rod iron, in described tempering process, first at the temperature of 230-250 DEG C, be incubated 4-6min, then temperature remained on 180-200 DEG C, maintain 15-20min, last air cooling is to room temperature; Described shrend speed of cooling is 8-10 DEG C/s.
The present invention passes through the adjustment of chemical composition and the improvement of thermal treatment process, the mechanical property of rod iron can be made to reach yield strength and to be greater than 1900MPa, tensile strength is greater than 2200MPa, maximum, force percentage of total elongation is greater than 2.5%, heart portion to the hardness on surface all at more than 60HRC, and have that weldability is good, thermal treatment process is simple, be easy to the feature produced in enormous quantities.This high-intensity high-tenacity rod iron after heat treatment can replace the rod iron of the highest 1570MPa rank listed by existing GB " steel bar for prestressed concrete ", in the prestressed components such as the centrifugal pile tube of high-strength prestressed concrete, electric pole, overhead bridge pier, railroad sleeper.
Embodiment
embodiment 1
A kind of tension PC rod iron that the present embodiment provides, the composition that described rod iron comprises and weight percentage thereof are: C:0.68%, Si:1.32%, Mn:0.21%, Cr:0.30%, Mo:0.05%, V:0.05%, Nb:0.007%, compound rare-earth: 1.10%, P, S content is less than 0.015%, Cu and is less than 0.10%, and surplus is iron and other trace impurities inevitable;
In described compound rare-earth, comprise following component by weight percentage: Ce:12%, Sc:11%, Gd:2%, Sm:1%, Dy:1%, Pr:15%, surplus is La.
The heat treating method of the tension PC rod iron of the present embodiment, comprises the following steps:
By rod iron through induction heating to 1150 DEG C, after making rod iron complete austenitizing, shrend immediately cooling to obtain full martensitic stucture,
(2) after rod iron shrend completes, at the temperature of 180-250 DEG C, carry out low-temperaturetempering process, in tempering process, first at the temperature of 230 DEG C, be incubated 6min, then temperature remained on 180 DEG C, maintain 20min, last air cooling is to room temperature; Described shrend speed of cooling is 10 DEG C/s, and final acquisition microstructure is the product of tempered martensite.
embodiment 2
A kind of tension PC rod iron that the present embodiment provides, the composition that described rod iron comprises and weight percentage thereof are: C:0.73%, Si:1.45%, Mn:0.25%, Cr:0.46%, Mo:0.065%, V:0.093%, Nb:0.0085%, compound rare-earth: 1.25%, P, S content is not more than 0.02%, Cu and is less than 0.15%, and surplus is iron and other trace impurities inevitable;
In described compound rare-earth, comprise following component by weight percentage: Ce:14%, Sc:12%, Gd:3%, Sm:2%, Dy:2%, Pr:18%, surplus is La.
The heat treating method of the tension PC rod iron of the present embodiment, comprises the following steps:
By rod iron through induction heating to 1100 DEG C, after making rod iron complete austenitizing, shrend immediately cooling to obtain full martensitic stucture,
(2) after rod iron shrend completes, at the temperature of 180-250 DEG C, carry out low-temperaturetempering process, in tempering process, first at the temperature of 240 DEG C, be incubated 5min, then temperature remained on 190 DEG C, maintain 18min, last air cooling is to room temperature; Described shrend speed of cooling is 10 DEG C/s, and final acquisition microstructure is the product of tempered martensite.
embodiment 3
A kind of tension PC rod iron that the present embodiment provides, the composition that described rod iron comprises and weight percentage thereof are: C:0.83%, Si:1.65%, Mn:0.28%, Cr:0.60%, Mo:0.075%, V:0.3%, Nb:0.013%, compound rare-earth: 1.35%, P, S content is not more than 0.01%, Cu and is less than 0.12%, and surplus is iron and other trace impurities inevitable;
In described compound rare-earth, comprise following component by weight percentage: Ce:16%, Sc:13%, Gd:5%, Sm:3%, Dy:2%, Pr:23%, surplus is La.
The heat treating method of the tension PC rod iron of the present embodiment, comprises the following steps:
By rod iron through induction heating to 1250 DEG C, after making rod iron complete austenitizing, shrend immediately cooling to obtain full martensitic stucture,
(2) after rod iron shrend completes, at the temperature of 180-250 DEG C, carry out low-temperaturetempering process, in tempering process, first at the temperature of 250 DEG C, be incubated 6min, then temperature remained on 200 DEG C, maintain 15min, last air cooling is to room temperature; Described shrend speed of cooling is 10 DEG C/s, and final acquisition microstructure is the product of tempered martensite.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.

Claims (9)

1. a tension PC rod iron, it is characterized in that the composition that described rod iron comprises and weight percentage thereof are: C:0.68-0.83%, Si:1.32-1.65%, Mn:0.21-0.28%, Cr:0.30-0.60%, Mo:0.05-0.075%, V:0.05-0.3%, Nb:0.007-0.013%, compound rare-earth: 1.10 ~ 1.35%, P, S content is not more than 0.02%, Cu and is less than 0.15%, and surplus is iron and other trace impurities inevitable.
2. tension PC rod iron according to claim 1, is characterized in that: in described compound rare-earth, comprises following component by weight percentage: Ce:12 ~ 16%, Sc:11 ~ 13%, Gd:2 ~ 5%, Sm:1 ~ 3%, Dy:1 ~ 2%, Pr:15 ~ 23%, surplus is La.
3. tension PC rod iron according to claim 1, is characterized in that: the microstructure of described rod iron is the tempered martensite that volume fraction is greater than 96%.
4. tension PC rod iron according to claim 1, it is characterized in that: the composition that described rod iron comprises and weight percentage thereof are: C:0.68%, Si:1.32%, Mn:0.21%, Cr:0.30%, Mo:0.05%, V:0.05%, Nb:0.007%, compound rare-earth: 1.10%, P, S content is less than 0.015%, Cu and is less than 0.10%, and surplus is iron and other trace impurities inevitable;
In described compound rare-earth, comprise following component by weight percentage: Ce:12%, Sc:11%, Gd:2%, Sm:1%, Dy:1%, Pr:15%, surplus is La.
5. tension PC rod iron according to claim 1, it is characterized in that: the composition that described rod iron comprises and weight percentage thereof are: C:0.73%, Si:1.45%, Mn:0.25%, Cr:0.46%, Mo:0.065%, V:0.093%, Nb:0.0085%, compound rare-earth: 1.25%, P, S content is not more than 0.02%, Cu and is less than 0.15%, and surplus is iron and other trace impurities inevitable;
In described compound rare-earth, comprise following component by weight percentage: Ce:14%, Sc:12%, Gd:3%, Sm:2%, Dy:2%, Pr:18%, surplus is La.
6. tension PC rod iron according to claim 1, it is characterized in that: the composition that described rod iron comprises and weight percentage thereof are: C:0.83%, Si:1.65%, Mn:0.28%, Cr:0.60%, Mo:0.075%, V:0.3%, Nb:0.013%, compound rare-earth: 1.35%, P, S content is not more than 0.01%, Cu and is less than 0.12%, and surplus is iron and other trace impurities inevitable;
In described compound rare-earth, comprise following component by weight percentage: Ce:16%, Sc:13%, Gd:5%, Sm:3%, Dy:2%, Pr:23%, surplus is La.
7., for a heat treating method for tension PC rod iron according to claim 1, it is characterized in that:
By rod iron through induction heating to 1100-1250 DEG C, after making rod iron complete austenitizing, shrend immediately cooling to obtain full martensitic stucture,
(2) after rod iron shrend completes, at the temperature of 180-250 DEG C, carry out low-temperaturetempering process, final acquisition microstructure is the product of tempered martensite.
8. the heat treating method of tension PC rod iron according to claim 7, is characterized in that: in described tempering process, first at the temperature of 230-250 DEG C, is incubated 4-6min, then temperature is remained on 180-200 DEG C, and maintain 15-20min, last air cooling is to room temperature.
9. the heat treating method of tension PC rod iron according to claim 7, is characterized in that: described shrend speed of cooling is 8-10 DEG C/s.
CN201410622568.7A 2014-11-08 2014-11-08 A kind of tension PC rod iron and its heat treatment method Expired - Fee Related CN104404374B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108004482A (en) * 2017-12-16 2018-05-08 苏州浩焱精密模具有限公司 A kind of corrosion-and high-temp-resistant mould

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002069578A (en) * 2000-09-06 2002-03-08 Nippon Steel Corp High strength rolled pc steel bar and its production method
JP4477762B2 (en) * 2000-09-06 2010-06-09 新日本製鐵株式会社 High strength rolled PC steel bar and method for manufacturing the same
CN102230129A (en) * 2011-07-12 2011-11-02 内蒙古包钢钢联股份有限公司 High-strength steel plate containing rare earth (RE) and heat treatment process thereof
CN103484789A (en) * 2013-09-16 2014-01-01 江苏天舜金属材料集团有限公司 Steel bar for high-ductility and superhigh-strength pre-stressed concrete and machining method thereof
CN103643135A (en) * 2013-11-20 2014-03-19 上海交通大学 PC steel bar with tensile strength of 2000 Mpa and above, and heat treatment method
CN104032223A (en) * 2014-06-17 2014-09-10 无锡市崇安区科技创业服务中心 Polycarbonate (PC) steel bar and heat treatment method thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002069578A (en) * 2000-09-06 2002-03-08 Nippon Steel Corp High strength rolled pc steel bar and its production method
JP4477762B2 (en) * 2000-09-06 2010-06-09 新日本製鐵株式会社 High strength rolled PC steel bar and method for manufacturing the same
CN102230129A (en) * 2011-07-12 2011-11-02 内蒙古包钢钢联股份有限公司 High-strength steel plate containing rare earth (RE) and heat treatment process thereof
CN103484789A (en) * 2013-09-16 2014-01-01 江苏天舜金属材料集团有限公司 Steel bar for high-ductility and superhigh-strength pre-stressed concrete and machining method thereof
CN103643135A (en) * 2013-11-20 2014-03-19 上海交通大学 PC steel bar with tensile strength of 2000 Mpa and above, and heat treatment method
CN104032223A (en) * 2014-06-17 2014-09-10 无锡市崇安区科技创业服务中心 Polycarbonate (PC) steel bar and heat treatment method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108004482A (en) * 2017-12-16 2018-05-08 苏州浩焱精密模具有限公司 A kind of corrosion-and high-temp-resistant mould

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