CN103643149B - Yield strength 650MPa level big specification V-alloyed steel pull bar hot rolled circular steel and Technology for Heating Processing thereof - Google Patents
Yield strength 650MPa level big specification V-alloyed steel pull bar hot rolled circular steel and Technology for Heating Processing thereof Download PDFInfo
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- CN103643149B CN103643149B CN201310704267.4A CN201310704267A CN103643149B CN 103643149 B CN103643149 B CN 103643149B CN 201310704267 A CN201310704267 A CN 201310704267A CN 103643149 B CN103643149 B CN 103643149B
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Abstract
The invention discloses yield strength 650MPa level big specification V-alloyed steel pull bar hot rolled circular steel and Technology for Heating Processing thereof, the chemical composition mass percent (wt%) of hot rolled circular steel is: C0.40～0.45%, Si0.17～0.37%, Mn0.70～0.90%, P≤0.015%, S≤0.010%, Cr1.00～1.20%, Mo0.20～0.30%, Ni0.15～0.30%, V0.02～0.09%, Als0.015～0.050% remaining be ferrum and remaining trace impurity；The Technology for Heating Processing of hot rolled circular steel, including normalizing, quenching, tempering process, the present invention is by using V, Ni composite alloying principle, in conjunction with the optimization to Technology for Heating Processing, by refined crystalline strengthening, precipitation strength and phase transformation strengthening mechanism, obtain the hot rolled circular steel structural state with uniform fine and closely woven sorbite+lower bainite metallographic structure, have developed high performance big specification 650MPa high-strength steel tension rod hot rolled circular steel, considerably reduce the addition of alloying element simultaneously, significantly reduce production cost.
Description
Technical field
The invention belongs to high-strength steel tension rod structural alloy steel hot rolled circular steel production technical field, particularly relate to yield strength
More than 650MPa level diameter of phi 150mm big gauge steel pull bar hot rolled circular steel and Technology for Heating Processing thereof.
Background technology
High-strength steel tension rod steel be widely used in hypogee such as high-rise building ground, ship lock, harbour, dock and
Ferrum tunnel, at surface structures such as stadiums, conference and exhibition center, railway station Waiting Lounge, museum, nuclear power station and bridge etc.
Numerous areas, is required for the reinforcing pull rod of all size and purposes, and its demand constantly rises.Reinforcing pull rod is in building structure
It is not only a connector, it is often more important that bear tension, steel construction plays very important effect.
In reinforcing pull rod GB GB/T20934-2007, reinforcing pull rod intensity rank regulation have GLG345, GLG460,
GLG550、GLG650.Wherein, intensity rank be the reinforcing pull rod format diameter scope of 650MPa be Φ 20～Φ 120mm.
In recent years, along with the fast development of domestic and international large-scale steel structure engineering, reinforcing pull rod intensity rank improves constantly, specification kind
It is on the increase, and diameter constantly increases.
At present, the manufacturing technology of the high-strength steel tension rod below domestic yield strength 550MPa level is the most ripe, and
The other reinforcing pull rod of 650MPa level higher level, is still in the development stage, carbon medium alloy constructional steel in main use.In order to
Ensure the high obdurability index of reinforcing pull rod, big gauge steel pull bar generally use in carbon CrNiMo alloy structure Steel material, as
40CrNiMoA etc., Ni content, more than 1.25%, causes production cost higher.
Summary of the invention
For the defect of prior art, the present invention provides a kind of yield strength 650MPa level big specification V-alloyed steel pull bar hot rolling
Round steel, can be greatly lowered the consumption of alloying element, in conjunction with Technology for Heating Processing of the present invention, thus produces the low one-tenth of high-performance
This large-size high-strength reinforcing pull rod hot rolled circular steel.
For solving above-mentioned technical problem, the present invention provides a kind of yield strength 650MPa level big specification V-alloyed steel pull bar heat
Rolling round steel, its chemical composition mass percent (wt%) is: C0.40～0.45%, Si0.17～0.37%, Mn0.70～
0.90%, P≤0.015%, S≤0.010%, Cr1.00～1.20%, Mo0.20～0.30%, Ni0.15～0.30%, V0.02～
0.09%, Als 0.015～0.050%, remaining is ferrum and remaining trace impurity；Described hot rolled circular steel has uniform fine and closely woven rope
Family name's body+lower bainite metallographic structure.
The present invention also provides for the Technology for Heating Processing of yield strength 650MPa level big specification V-alloyed steel pull bar hot rolled circular steel, bag
Including normalizing, quenching, tempering process, described normalizing process is as follows: the reinforcing pull rod heat that will produce by claim 1 composition
Roll round steel and be heated to 860～900 DEG C, the heating and thermal insulation time according to the diameter of described reinforcing pull rod hot rolled circular steel by 1.2～
1.7min/mm calculates, air cooling.
Described quenching process comprises the following steps: the reinforcing pull rod hot rolled circular steel produced by claim 1 composition is added by (1)
Heat to 830～870 DEG C, the heating and thermal insulation time according to the diameter of described reinforcing pull rod hot rolled circular steel based on 1.5～2.0min/mm
Calculate；(2) cooling when polymer water base rapid quenching agent or the double medium circulation control of salt water-air, water-cooled time root are carried out after insulation
Determine with 1.0～2.0min/100mm according to the diameter of described reinforcing pull rod hot rolled circular steel；Air cooling time is used according to described reinforcing pull rod
The diameter of hot rolled circular steel determines with 0.5～1.0min/100mm；(3) circulating cooling later moments, when surface of the work is cooled to
Stop water-cooled when 250～270 DEG C, go out water-air cooling, as the internal surface temperature of 4min gos up less than 300 DEG C, the most empty
Cold, no longer water-cooled；Internal surface temperature such as 4min gos up more than 300 DEG C, then continue into water cooling.
Described tempering process is as follows: the reinforcing pull rod hot rolled circular steel produced by claim 1 composition is heated to 610～670
DEG C, the heating and thermal insulation time calculates by 2～2.5min/mm according to the diameter of described reinforcing pull rod hot rolled circular steel, water or oil cooling.
Design philosophy of the present invention is as follows:
(1) vanadium is the element strongly forming high rigidity carbide, and energy crystal grain thinning, the temper resistance of raising, with
The impact flexibility of Shi Gaishan steel and temper brittleness.(2) nickel can improve the intensity of steel, can make again the plasticity that steel holding is good
And toughness.When nickel 0.15～0.30%, so that it may significantly improve the low-temperature impact toughness of steel.(3) big specification (Φ 150～
Φ 250mm) medium carbon structural alloy steel, only strengthens the rate of cooling of internal layer, obtains more martensite and lower shellfish when quenching
Family name's body, then through tempering, just can obtain the metallographic structure of uniform fine and closely woven sorbite+lower bainite, thus just can obtain good
Toughness plasticity and suitable intensity index.(4), in quenching process, the purpose using air cooling is uniform round steel section temperature, subtracts
Few crackle tendency.
The present invention is by using V, Ni composite alloying principle, in conjunction with the optimization to Technology for Heating Processing, with refined crystalline strengthening,
Precipitation strength and phase transformation strengthening mechanism, obtain the hot rolled circular steel tissue with uniform fine and closely woven sorbite+lower bainite metallographic structure
State, have developed high performance big specification 650MPa high-strength steel tension rod hot rolled circular steel, considerably reduces alloy simultaneously
The addition of element, can significantly reduce production cost.
Use the chemical composition of the present invention, technological process and Technology for Heating Processing technological parameter, take same diameter 400mm length
Hot rolled circular steel carries out modifier treatment, and the vertical mixing coefficient measuring steel can reach: Rm>=850MPa, ReLOr
Rp0.2>=650MPa, A >=15%, Z >=45% ,-40 DEG C of impact absorbing energy KV2≥34J。
Detailed description of the invention
The large-size high-strength reinforcing pull rod hot rolled circular steel technological process of production of the present invention is: electric arc furnace or converter smelting → LF
Stove refine → RH or VD vacuum outgas → round billet continuous casting → strand heating furnace heating → blooming mill rolling → six frame tandem mills
Rolling.
Below by Φ 250mm, two specifications of Φ 150mm high-strength steel tension rod hot rolled circular steel as a example by describe this in detail
Invention.
Embodiment 1: Φ 250mm reinforcing pull rod hot rolled circular steel
The melting chemical composition of reinforcing pull rod hot rolled circular steel is shown in Table 1, performance refers to after reinforcing pull rod hot rolled circular steel bulk heat treatmet
Mark is shown in Table 2.Technology for Heating Processing step and parameter be:
(1) normalizing: the large-size high-strength reinforcing pull rod hot rolled circular steel of a length of 300～400mm is heated to 860～900
DEG C, the heating and thermal insulation time is by 1.2～1.7min/mm calculating, air cooling.After normalizing, not only refine crystal grain, and improved
The inhomogeneities of tissue, carries out tissue for finished heat treatment subsequently and prepares.
(2) quenching: the large-size high-strength reinforcing pull rod hot rolled circular steel of a length of 300～400mm is heated to 830～870
DEG C, the heating and thermal insulation time, by 1.5～2.0min/mm calculating, carries out polymer water base rapid quenching agent or salt water-air subsequently
Cool down during double medium circulation control.The determination of water-cooled time: 1.0～2.0min/100mm；The determination of air cooling time: 0.5～
1.0min/100mm.Circulating cooling later moments, stops water-cooled when surface of the work is cooled to 250～270 DEG C, and water outlet is empty
Cold, as the internal surface temperature of 4min gos up less than 300 DEG C, air cooling the most subsequently, no longer water-cooled；Inner surface such as 4min
Temperature recovery more than 300 DEG C, then continues into water cooling.
(3) tempering: large-size high-strength reinforcing pull rod hot rolled circular steel is heated to 610～670 DEG C, the heating and thermal insulation time
Calculate by 2～2.5min/mm, water or oil cooling.
The melting chemical composition mass percent (wt%) of table 1 reinforcing pull rod hot rolled circular steel
Table 2 reinforcing pull rod performance indications after hot rolled circular steel bulk heat treatmet
Embodiment 2: Φ 150mm reinforcing pull rod hot rolled circular steel
The melting chemical composition of reinforcing pull rod hot rolled circular steel is shown in Table 3, performance refers to after reinforcing pull rod hot rolled circular steel bulk heat treatmet
Mark is shown in Table 4.Technology for Heating Processing step and parameter be:
(1) normalizing: the large-size high-strength reinforcing pull rod hot rolled circular steel of a length of 300～400mm is heated to temperature 860～
900 DEG C, the heating and thermal insulation time is by 1.2～1.7min/mm calculating, air cooling.Crystal grain, Er Qiegai has not only been refined after normalizing
It is apt to the inhomogeneities of tissue, has carried out tissue for finished heat treatment subsequently and prepare.
(2) quenching: the large-size high-strength reinforcing pull rod hot rolled circular steel of a length of 300～400mm is heated to temperature 830～
870 DEG C, the heating and thermal insulation time by 1.5～2.0min/mm calculating, carry out subsequently polymer water base rapid quenching agent or saline-
Cooling during air double medium circulation control.The determination of water-cooled time: 1.0～2.0min/100mm；The determination of air cooling time: 0.5～
1.0min/100mm.Circulating cooling later moments, stops water-cooled when surface of the work is cooled to 250～270 DEG C, and water outlet is empty
Cold, as the internal surface temperature of 4min gos up less than 300 DEG C, air cooling the most subsequently, no longer water-cooled；Inner surface such as 4min
Temperature recovery more than 300 DEG C, then continues into water cooling.
(3) tempering: by large-size high-strength reinforcing pull rod hot rolled circular steel to heating-up temperature 610～670 DEG C, heating and thermal insulation
Time is by 2～2.5min/mm calculating, water or oil cooling.
The melting chemical composition mass percent (wt%) of table 3 reinforcing pull rod hot rolled circular steel
Table 4 reinforcing pull rod performance indications after hot rolled circular steel bulk heat treatmet
Claims (2)
1. a yield strength 650MPa level big specification V-alloyed steel pull bar hot rolled circular steel, it is characterised in that
Its chemical composition mass percent (wt%) is: C0.40～0.45%, Si0.17～0.37%, Mn0.70～
0.90%, P≤0.015%, S≤0.010%, Cr1.00～1.20%, Mo0.20～0.30%, Ni0.15～0.30%,
V0.02～0.09%, Als0.015～0.050%, remaining is ferrum and remaining trace impurity；Described hot rolling circle
Steel has uniform fine and closely woven sorbite+lower bainite metallographic structure.
2. a Technology for Heating Processing for yield strength 650MPa level big specification V-alloyed steel pull bar hot rolled circular steel,
Including normalizing, quenching, tempering process, it is characterised in that described normalizing process is as follows: will be by claim
The reinforcing pull rod hot rolled circular steel that 1 composition produces is heated to 860～900 DEG C, and the heating and thermal insulation time is according to described steel
The diameter of pull bar hot rolled circular steel is by 1.2～1.7min/mm calculating, air cooling；Described quenching process include with
Lower step: the reinforcing pull rod hot rolled circular steel produced by claim 1 composition is heated to 830～870 DEG C by (1),
The heating and thermal insulation time calculates by 1.5～2.0min/mm according to the diameter of described reinforcing pull rod hot rolled circular steel；(2)
Cooling when polymer water base rapid quenching agent or the double medium circulation control of salt water-air, water-cooled time is carried out after insulation
Diameter according to described reinforcing pull rod hot rolled circular steel determines with 1.0～2.0min/100mm；Air cooling time according to
The diameter of described reinforcing pull rod hot rolled circular steel determines with 0.5～1.0min/100mm；(3) the circulating cooling later stage
Period, stop water-cooled when surface of the work is cooled to 250～270 DEG C, go out water-air cooling, such as the inner surface of 4min
Temperature recovery is less than 300 DEG C, air cooling the most subsequently, no longer water-cooled；As the internal surface temperature of 4min gos up super
Cross 300 DEG C, then continue into water cooling；Described tempering process is as follows: the steel that will produce by claim 1 composition
Pull bar hot rolled circular steel is heated to 610～670 DEG C, and the heating and thermal insulation time is according to described reinforcing pull rod hot rolled circular steel
Diameter by 2～2.5min/mm calculating, water or oil cooling.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104313282B (en) * | 2014-09-01 | 2016-05-04 | 富阳通力机械制造有限公司 | A kind of pull bar heat treatment method |
| CN104233111B (en) * | 2014-10-11 | 2016-09-14 | 马钢(集团)控股有限公司 | A kind of Technology for Heating Processing containing vanadium titanium bullet train axletree |
| CN104372260B (en) * | 2014-11-07 | 2017-03-08 | 佛山市南海区华恭金属加工有限公司 | High-strength steel tension rod and its heat treatment method |
| CN105821308A (en) * | 2016-06-07 | 2016-08-03 | 马鞍山钢铁股份有限公司 | Heat processing technology for vanadium and niobium-containing steel for motor train unit axle |
| CN106048152B (en) * | 2016-07-24 | 2019-01-15 | 钢铁研究总院 | A kind of heat treatment method improving bar low-temperature impact toughness |
| CN116536584A (en) * | 2023-05-05 | 2023-08-04 | 本钢板材股份有限公司 | GGP300 hot-rolled round steel for load bearing shaft and preparation method thereof |
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| CN1706979A (en) * | 2004-06-07 | 2005-12-14 | 河南石油勘探局南阳石油机械厂 | Cast steel for bearing parts in mechanical lifting system and its making process |
| CN101353762A (en) * | 2007-07-23 | 2009-01-28 | 宝山钢铁股份有限公司 | Silver copper composite deep punch type ferrite antibiotic stainless steel, steel plate and manufacturing method thereof |
| CN101613835A (en) * | 2008-06-27 | 2009-12-30 | 宝山钢铁股份有限公司 | A kind of alloy hot rolled steel plate and make the method for gas cylinder with it |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH06299295A (en) * | 1993-04-13 | 1994-10-25 | Kobe Steel Ltd | Steel for high strength spring and its production |
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|---|---|---|---|---|
| CN1706979A (en) * | 2004-06-07 | 2005-12-14 | 河南石油勘探局南阳石油机械厂 | Cast steel for bearing parts in mechanical lifting system and its making process |
| CN101353762A (en) * | 2007-07-23 | 2009-01-28 | 宝山钢铁股份有限公司 | Silver copper composite deep punch type ferrite antibiotic stainless steel, steel plate and manufacturing method thereof |
| CN101613835A (en) * | 2008-06-27 | 2009-12-30 | 宝山钢铁股份有限公司 | A kind of alloy hot rolled steel plate and make the method for gas cylinder with it |
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