CN103643151B - Yield strength 650MPa level large gauge niobium vanadium steel pull bar hot rolled circular steel and thermal treatment process thereof - Google Patents
Yield strength 650MPa level large gauge niobium vanadium steel pull bar hot rolled circular steel and thermal treatment process thereof Download PDFInfo
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- CN103643151B CN103643151B CN201310704368.1A CN201310704368A CN103643151B CN 103643151 B CN103643151 B CN 103643151B CN 201310704368 A CN201310704368 A CN 201310704368A CN 103643151 B CN103643151 B CN 103643151B
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Abstract
The invention discloses yield strength 650MPa level large gauge niobium vanadium steel pull bar hot rolled circular steel and thermal treatment process thereof, hot rolled circular steel 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%, V0.01 ~ 0.03%, Nb0.010 ~ 0.030%, Als0.015 ~ 0.050%, all the other are iron and remaining trace impurity; The thermal treatment process of hot rolled circular steel, comprise normalizing, quenching, tempering process, the present invention is by adopting niobium, vanadium, Ni composite alloying principle, in conjunction with the optimization to thermal treatment process, by refined crystalline strengthening, precipitation strength and phase transformation strengthening mechanism, obtain the hot rolled circular steel structural state with even fine and closely woven sorbite+lower bainite metallographic structure, have developed high performance large gauge 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 650MPa level diameter of phi 150mm above large gauge Steel Rod hot rolled circular steel and thermal treatment process thereof.
Background technology
High-strength steel tension rod steel is widely used in hypogee as high-rise building ground, ship lock, harbour, dock and subway tunnel, at surface structures as numerous areas such as stadiums, conference and exhibition center, railway station Waiting Lounge, museum, Nuclear power plants and bridges, all need the Steel Rod of all size and purposes, its demand constantly rises.A web member is not only by Steel Rod in building structure, the more important thing is and bears tensile stress, play a part very important in steel construction.
In Steel Rod GB GB/T20934-2007, Steel Rod intensity rank regulation has GLG345, GLG460, GLG550, GLG650.Wherein, intensity rank is the Steel Rod format diameter scope of 650MPa is Φ 20 ~ Φ 120mm.In recent years, along with the fast development of domestic and international large-scale steel structure engineering, Steel Rod intensity rank improves constantly, and specification kind 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 ripe, and other Steel Rod of 650MPa level higher level, be still in the development stage, carbon medium alloy constructional steel in main use.In order to ensure the obdurability index that Steel Rod is high, during large gauge Steel Rod adopts usually, carbon CrNiMo alloy structure steel, if 40CrNiMoA etc., Ni content is more than 1.25%, causes production cost higher.
Summary of the invention
For the defect of prior art, the invention provides a kind of yield strength 650MPa level large gauge niobium vanadium steel pull bar hot rolled circular steel, significantly can reduce the consumption of alloying element, in conjunction with thermal treatment process of the present invention, thus produce the large-size high-strength Steel Rod hot rolled circular steel of high-performance and low-cost.
For solving the problems of the technologies described above, the invention provides a kind of yield strength 650MPa level large gauge niobium vanadium steel pull bar hot rolled circular 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%, V0.01 ~ 0.03%, Nb0.010 ~ 0.030%, Als0.015 ~ 0.050%, all the other are iron and remaining trace impurity.
The present invention also provides the thermal treatment process of yield strength 650MPa level large gauge niobium vanadium steel pull bar hot rolled circular steel, comprise normalizing, quenching, tempering process, described normalizing process is as follows: the Steel Rod hot rolled circular steel produced by claim 1 composition is heated to 860 ~ 900 DEG C, the heating and thermal insulation time calculates by 1.2 ~ 1.7min/mm according to the diameter of described Steel Rod hot rolled circular steel, air cooling.
Described quenching process comprises the following steps: the Steel Rod hot rolled circular steel produced by claim 1 composition is heated to 830 ~ 870 DEG C by (1), and the heating and thermal insulation time calculates by 1.5 ~ 2.0min/mm according to the diameter of described Steel Rod hot rolled circular steel; (2) the rapid quenching agent of polymer water base or salt solution is carried out after insulation--cool during the two medium circulation control of air, the water-cooled time is determined with 1.0 ~ 2.0min/100mm according to the diameter of described Steel Rod hot rolled circular steel; Air cooling time is determined with 0.5 ~ 1.0min/100mm according to the diameter of described Steel Rod hot rolled circular steel; (3) circulating cooling later moments, stops water-cooled when workpiece surface is cooled to 250 ~ 270 DEG C, goes out water-air cooling, and the internal surface temperature as 4min gos up to be no more than 300 DEG C, then air cooling, no longer water-cooled subsequently; Internal surface temperature as 4min gos up more than 300 DEG C, then continue into water cooling.
Described tempering process is as follows: the Steel Rod hot rolled circular steel produced by claim 1 composition is heated to 610 ~ 670 DEG C, and the heating and thermal insulation time calculates by 2 ~ 2.5min/mm according to the diameter of described Steel Rod hot rolled circular steel, water or oil cooling.
Design philosophy of the present invention is as follows:
(1) niobium, vanadium are the elements strongly forming high rigidity carbide, and energy crystal grain thinning, the temper resistance of raising, improves impelling strength and the temper brittleness of steel simultaneously.(2) nickel can improve the intensity of steel, and steel can be made again to keep good plasticity and toughness.When nickel 0.15 ~ 0.30%, just can significantly improve the low-temperature impact toughness of steel.(3) large gauge (Φ 150 ~ Φ 250mm) medium carbon structural alloy steel, the speed of cooling of internal layer is only strengthened when quenching, obtain more martensite and lower bainite, again through tempering, just can obtain the metallographic structure of even fine and closely woven sorbite+lower bainite, thus just can obtain good toughness plasticity and suitable intensity index.(4) in quenching process, the object adopting air cooling is even round steel section temperature, reduces crackle tendency.
The present invention is by adopting niobium, vanadium, Ni composite alloying principle, in conjunction with the optimization to thermal treatment process, by refined crystalline strengthening, precipitation strength and phase transformation strengthening mechanism, obtain the hot rolled circular steel structural state with even fine and closely woven sorbite+lower bainite metallographic structure, have developed high performance large gauge 650MPa high-strength steel tension rod hot rolled circular steel, considerably reduce the addition of alloying element simultaneously, significantly can reduce production cost.
Adopt chemical composition of the present invention, technical process and thermal treatment process processing parameter, the hot rolled circular steel getting same diameter 400mm long carries out modifier treatment, and the vertical mixing coefficient measuring steel can reach: R
m>=850MPa, R
eLor R
p0.2>=650MPa, A>=15%, Z>=45% ,-40 DEG C of impact absorbing energy KV
2>=34J.
Embodiment
The large-size high-strength Steel Rod hot rolled circular steel technological process of production of the present invention is: electric arc furnace or converter smelting → LF stove refining → RH or VD vacuum outgas → round billet continuous casting → strand process furnace heating → bloomer rolling → six frame tandem mill rolling.
The present invention is described in detail below for the high-strength steel tension rod hot rolled circular steel of Φ 250mm, Φ 150mm two specifications.
Embodiment 1: Φ 250mm Steel Rod hot rolled circular steel
The melting chemical composition of Steel Rod hot rolled circular steel in performance index after table 1, the complete heat treatment of Steel Rod hot rolled circular steel in table 2.Thermal treatment process step and parameter are:
(1) normalizing: the large-size high-strength Steel Rod hot rolled circular steel being 300 ~ 400mm by length is heated to 860 ~ 900 DEG C, the heating and thermal insulation time calculates by 1.2 ~ 1.7min/mm, air cooling.Not only refinement crystal grain after normalizing, and improve the ununiformity of tissue, carry out tissue for finished heat treatment subsequently and prepare.
(2) quench: the large-size high-strength Steel Rod hot rolled circular steel being 300 ~ 400mm by length is heated to 830 ~ 870 DEG C, the heating and thermal insulation time calculates by 1.5 ~ 2.0min/mm, cools when carrying out the two medium circulation control of the water base rapid quenching agent of polymkeric substance or salt water-air subsequently.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 workpiece surface is cooled to 250 ~ 270 DEG C, goes out water-air cooling, and the internal surface temperature as 4min gos up to be no more than 300 DEG C, then air cooling, no longer water-cooled subsequently; Internal surface temperature as 4min gos up more than 300 DEG C, then continue into water cooling.
(3) tempering: large-size high-strength Steel Rod hot rolled circular steel is heated to 610 ~ 670 DEG C, the heating and thermal insulation time calculates by 2 ~ 2.5min/mm, water or oil cooling.
The melting chemical composition mass percent (wt%) of table 1 Steel Rod hot rolled circular steel
Table 2 Steel Rod performance index after hot rolled circular steel complete heat treatment
Embodiment 2: Φ 150mm Steel Rod hot rolled circular steel
The melting chemical composition of Steel Rod hot rolled circular steel in performance index after table 3, the complete heat treatment of Steel Rod hot rolled circular steel in table 4.Thermal treatment process step and parameter are:
(1) normalizing: the large-size high-strength Steel Rod hot rolled circular steel being 300 ~ 400mm by length is heated to temperature 860 ~ 900 DEG C, the heating and thermal insulation time calculates by 1.2 ~ 1.7min/mm, air cooling.Not only refinement crystal grain after normalizing, and improve the ununiformity of tissue, carry out tissue for finished heat treatment subsequently and prepare.
(2) quench: the large-size high-strength Steel Rod hot rolled circular steel being 300 ~ 400mm by length is heated to temperature 830 ~ 870 DEG C, the heating and thermal insulation time calculates by 1.5 ~ 2.0min/mm, cools when carrying out the two medium circulation control of the water base rapid quenching agent of polymkeric substance or salt water-air subsequently.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 workpiece surface is cooled to 250 ~ 270 DEG C, goes out water-air cooling, and the internal surface temperature as 4min gos up to be no more than 300 DEG C, then air cooling, no longer water-cooled subsequently; Internal surface temperature as 4min gos up more than 300 DEG C, then continue into water cooling.
(3) tempering: by large-size high-strength Steel Rod hot rolled circular steel to Heating temperature 610 ~ 670 DEG C, the heating and thermal insulation time calculates by 2 ~ 2.5min/mm, water or oil cooling.
The melting chemical composition mass percent (wt%) of table 3 Steel Rod hot rolled circular steel
Table 4 Steel Rod performance index after hot rolled circular steel complete heat treatment
Claims (2)
1. a yield strength 650MPa level large gauge niobium vanadium steel pull bar hot rolled circular steel, is characterized 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%, V0.01 ~ 0.03%, Nb0.010 ~ 0.030%, Als0.015 ~ 0.050%, all the other are iron and remaining trace impurity; Described hot rolled circular steel has even fine and closely woven sorbite+lower bainite metallographic structure.
2. the thermal treatment process of a yield strength 650MPa level large gauge niobium vanadium steel pull bar hot rolled circular steel, comprise normalizing, quenching, tempering process, it is characterized in that, described normalizing process is as follows: the Steel Rod hot rolled circular steel produced by claim 1 composition is heated to 860 ~ 900 DEG C, the heating and thermal insulation time calculates by 1.2 ~ 1.7min/mm according to the diameter of described Steel Rod hot rolled circular steel, air cooling; Described quenching process comprises the following steps: the Steel Rod hot rolled circular steel produced by claim 1 composition is heated to 830 ~ 870 DEG C by (1), and the heating and thermal insulation time calculates by 1.5 ~ 2.0min/mm according to the diameter of described Steel Rod hot rolled circular steel; (2) cool when carrying out the two medium circulation control of the rapid quenching agent of polymer water base or salt water-air after insulation, the water-cooled time is determined with 1.0 ~ 2.0min/100mm according to the diameter of described Steel Rod hot rolled circular steel; Air cooling time is determined with 0.5 ~ 1.0min/100mm according to the diameter of described Steel Rod hot rolled circular steel; (3) circulating cooling later moments, stops water-cooled when workpiece surface is cooled to 250 ~ 270 DEG C, goes out water-air cooling, and the internal surface temperature as 4min gos up to be no more than 300 DEG C, then air cooling, no longer water-cooled subsequently; Internal surface temperature as 4min gos up more than 300 DEG C, then continue into water cooling; Described tempering process is as follows: the Steel Rod hot rolled circular steel produced by claim 1 composition is heated to 610 ~ 670 DEG C, and the heating and thermal insulation time calculates by 2 ~ 2.5min/mm according to the diameter of described Steel Rod hot rolled circular steel, water or oil cooling.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1410581A (en) * | 2001-10-01 | 2003-04-16 | 住友金属工业株式会社 | Steel for mechanical structure and mfg. method thereof |
| CN101935811A (en) * | 2010-08-09 | 2011-01-05 | 江苏沙钢集团淮钢特钢有限公司 | Steel with high strength, low-temperature impact resistance and weatherability for wind-powered pivoting support and production process thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4288441B2 (en) * | 2000-03-22 | 2009-07-01 | 住友金属工業株式会社 | High-strength seamless steel pipe excellent in toughness, ductility, and weldability and method for producing the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1410581A (en) * | 2001-10-01 | 2003-04-16 | 住友金属工业株式会社 | Steel for mechanical structure and mfg. method thereof |
| CN101935811A (en) * | 2010-08-09 | 2011-01-05 | 江苏沙钢集团淮钢特钢有限公司 | Steel with high strength, low-temperature impact resistance and weatherability for wind-powered pivoting support and production process thereof |
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