CN101619420A - 10.9-grade chromium-containing non-quenched and tempered cold-heading steel and rolling method of hot finished rod thereof - Google Patents
10.9-grade chromium-containing non-quenched and tempered cold-heading steel and rolling method of hot finished rod thereof Download PDFInfo
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Abstract
The invention provides a 10.9-grade chromium-containing non-quenched and tempered cold-heading steel. The cold-heading steel comprises the following components in percentage (%) by weight: C accounts for 0.08-0.14, Si accounts for 0.03-0.35, Mn accounts for 1.80-2.30, P accounts for less than or equal to 0.025, S accounts for less than or equal to 0.015, B accounts for 0.0005-0.003, Ti accounts for 0.01-0.03, Als accounts for 0.010-0.050, Cr accounts for 0.20-0.40, and the balance is iron and micro-impurity. The rolling method of the hot finished rod comprises the following steps: the heating temperature is ranged from 1,050-1,250 DEG C, the rough and intermediate rolling temperature is ranged from 1,000 to 1,050 DEG C, the precision rolling temperature is ranged from 750 to 830 DEG C, the amount of deformation is 50-60 percent, the rate of deformation is 20/s, the spinning temperature is ranged from 730 to 850 DEG C, the cooling is carried out in two sections after spinning, the rapid cooling is carried out at a low speed being equal to or higher than 5 DEG C/s at the temperature above 550 DEG C, and the slow cooling is carried out at a cooling rate of 0.1-3 DEG C/s at the temperature below 550 DEG C.
Description
Technical field
The invention belongs to fastening piece and use the cold heading steel field, relate in particular to the production method of a kind of 10.9 grades of fastening pieces with non-quenched cold heading steel and gren rod thereof.
Background technology
The strength level of high strength fastening pieces such as high strength bolt generally is divided into 8.8,9.8,10.9 and 12.9 four ranks, is generally the medium carbon steel or the medium carbon alloy steel of modifier treatment, and non-hardened and tempered steel is also arranged.Non-modified fastening piece production process is compared with modified fastening piece production process, modified thermal treatment after the production of non-modified fastening piece can be saved Spheroidizing Annealing, the minimizing drawing number of times before the cold-heading and be saved cold-heading etc., this has simplified production process to a great extent, shortened the production cycle, reduced energy consumption, also avoided simultaneously because of the problems such as surface oxidation, decarburization and workpiece deformation that thermal treatment causes, thereby had remarkable economic efficiency and social benefit.
Because the hardness height of the quenched and tempered steel that the hardness of high-strength micro-alloy non-hardened and tempered steel gren rod when cold working is more common, crack initiation rate height when this makes 10.9 grade bolts (as flange bolt) of cold working complicated shape, and the life-span of cold working mould decrease, therefore at present the bolt of middle carbon microalloy pearlitic steel manufacturing is mainly 8.8 grades, 9.8 grades.
" Automobile Technology and Material " o. 11th 43-48 in 2007 page or leaf has been reported a kind of 9.8 grades of cold work reinforced non-hardened/tempered steel high-strength vehicle U bolts, chemical ingredients is 0.15-0.20%C, 0.30-0.60%Si, 1.35-1.75%Mn, ≤ 0.030%P, ≤ 0.030%S, 0.010-0.040%Ti, 0.04-0.07%V.
" special steel " 1993 the 6th phase 23-26 pages or leaves have been reported a kind of 10.9 grades of cold work reinforced non-hardened/tempered steels, and chemical ingredients is 0.09-0.13%C, 0.17-0.37%Si, 1.90-2.40%Mn ,≤0.030%P ,≤0.030%S, 0.04-0.08%Ti, 0.08-0.12%V, 0.001-0.005%B.There is following defective in the microalloy element design of this steel: (1) Ti content is 0.04-0.08%, and the easy oxidation of Ti element during adding＞0.04-0.10%Ti, can increase TiO in the steel
2The amount of inclusions and fatigue cracking source point, thereby the work-ing life of reducing fastening piece; (2) B content is 0.001-0.005%, if when surpassing 0.004%, then occurs boron compound fragility phase when boron content easily; (3) V content 0.08-0.12%, the adding of v element can improve the intensity and the toughness of steel, but add-on is greater than 0.03% when above, and the affiliation that adds of v element reduces impelling strength, and cold heading performance is reduced.And be subjected to the restriction of production technology level, the cold deformation ability of wire rod, strength fluctuation are big, thereby fail to obtain industrialized mass production and application always.
Summary of the invention
The technical problem to be solved in the present invention provides the rolling method of a kind of 10.9 grade chromium-containing non-quenched cold heading steels and gren rod thereof, this steel grade can improve intensity rank and the cold-forming property of fastening piece with non-hardened and tempered steel, and accomplish rationally, balancedly to utilize resource, adopt less microalloy element add-on, reduce production costs.
10.9 grade chromium-containing non-quenched cold heading steels provided by the invention, the weight percent of its component (%) is: C0.08%-0.14%, Si0.03%-0.35%, Mn 1.80%-2.30%, P≤0.025%, S≤0.015%, B0.0005%-0.003%, Ti0.01%-0.03%, Als0.010%-0.050%, Cr 0.20%-0.40%, all the other are iron and trace impurity.
The rolling method of 10.9 grade chromium-containing non-quenched cold heading steel gren rods of the present invention is: steel billet heats the back and is rolled on high-speed rod-rolling mill in process furnace, collect volume, cooling, bundling, warehouse-in then, wherein, Heating temperature 1050-1250 ℃, thick, in roll rolling temperature 1000-1050 ℃, final rolling temperature 750-830 ℃, laying temperature 730-850 ℃, the back wire rod of weaving silk divides two sections controlled chilling, and the cooling rate with 〉=5 ℃/s more than 550 ℃ is cold soon, less than 550 ℃ of cooling rate slow cooling with 0.1-3 ℃/s.
The technical thought that the present invention mainly adopts optimizing components design and low temperature controlled rolling and controlled cooling to organically combine, so that gren rod obtains the granular bainite tissue topography of refinement, be to be distributed with the M-A island on the bainite type ferrite matrix, martensite is lath-shaped in the island, thereby has good cold-workability and toughness, with a low cold-heading and a low flexible difficult problem that solves traditional non-quenched cold heading steel wire rod, thereby promote further applying of non-quenched cold heading steel wire rod.
The composition design of steel of the present invention is to add elements such as Ti, B in the C-Mn of carbon containing about 0.10% system, adds a spot of Cr simultaneously, guarantees to obtain suitable intensity and toughness plasticity.10.9 grades of fastening pieces of the present invention with the chemical ingredients proportioning (by weight percentage) of non-hardened and tempered steel are: 0.08-0.14%C, 0.03-0.35%Si, 1.80-2.30%Mn, ≤ 0.025%P ,≤0.015%S, 0.0005-0.003%B, 0.01-0.03%Ti, 0.010-0.050%Als, 0.20-0.40%Cr, all the other are Fe and impurity element.
The technological process of production of the present invention is: converter or electrosmelting, external refining, continuous pouring become steel billet, and high-speed rod low temperature controlled rolling and controlled cooling is rolling.
High-speed rod low temperature controlled rolling and controlled cooling rolling technological parameter is: be heated to 1050-1250 ℃ in the process furnace, final rolling temperature is 750-830 ℃, controlled chilling divides two sections controls, take more than 550 ℃ 〉=cooling rate of 5 ℃/s is cold soon, less than 550 ℃ of cooling rate slow cooling of taking 0.1-3 ℃/s.
Adopt chemical ingredients of the present invention, technical process and high-speed rod low temperature controlled rolling and controlled cooling rolling technological parameter, can obtain the granular bainite tissue of refinement, the R of gren rod
mMore than 750MPa, Z is more than 55%.
Specify the content of technical scheme below:
The composition design: (1) carbon content increase can improve the intensity of steel, but is unfavorable for cold heading performance, is intensity and the cold machining process performance of taking into account steel, is 0.08-0.14% so select the carbon content of steel.(2) though silicon can significantly improve the resistance to deformation of steel, totally unfavorable to cold-heading and cold extrusion, so silicone content should not be too high, silicon is controlled at 0.03-0.35%.(3) manganese is the important element that increases hardness of steel, also is simultaneously to form one of the most effective low-cost alloying element of bainite structure, and the present invention has adopted higher manganese content: 1.80-2.30%.(4) because this steel grade contains B, so must add the solid N of Ti.But the easy oxidation of Ti element during adding＞0.04-0.10%Ti, can increase TiO in the steel
2The amount of inclusions and fatigue cracking source point, thereby the work-ing life of reducing fastening piece are so the people's amount that adds of Ti of the present invention is controlled at 0.01-0.03%.(5) the desirable moiety of the modified high strength bolting steel of Cr right and wrong can significantly be postponed perlitic transformation, makes steel obtain bainite structure easily.Owing to adopted low temperature controlled rolling and controlled cooling rolling technology, its add-on needn't be too much, and the chromium that adds 0.20-0.40% gets final product.
Producing the method for 10.9 grade chromium-containing non-quenched cold heading steel gren rods carries out according to the following steps: (1) smelts: smelting on converter or electric furnace, external refining, continuous pouring become steel billet.(2) controlled rolling: in process furnace, be heated to 1050-1250 ℃.Be rolled on high-speed rod-rolling mill, thick, middle milling train adopts 1000-1050 ℃ of controlled rolling of rolling temperature, and finishing mill adopts 750-830 ℃ of low temperature rolling.Laying temperature 730-850 ℃.(3) controlled chilling: divide two sections controls, take more than 550 ℃ 〉=cooling rate of 5 ℃/s is cold soon, less than 550 ℃ of cooling rate slow cooling of taking 0.1-3 ℃/s.(4) collection volume, naturally cooling, bundling, warehouse-in.
Can obtain qualified rolling raw material steel billet by above-mentioned smelting step.For the needs of rolling technology with make carbon, nitride solid solution in austenite, billet heating temperature is pressed 1050-1250 ℃ of scope control when rolling.Finish thick, middle mill milling more than 1000 ℃, promptly finishing rolling substantially in the austenite recrystallization district is in order to realize the recrystallize refinement, and existing thick, in roll steel rolling equipment and technology realizes easily.Finishing mill adopts 750-830 ℃ of low temperature rolling, laying temperature 730-850 ℃, helps the final product tissue of further refinement.Divide two sections controlled chilling, promptly take more than 550 ℃ 〉=cooling rate of 5 ℃/s is cold soon, less than 550 ℃ of cooling rate slow cooling of taking 0.1-3 ℃/s, is in order to guarantee to obtain the granular bainite tissue of refinement.
Compared with prior art, effect of the present invention and advantage:
10.9 grade chromium-containing non-quenched cold heading steel gren rods of the present invention, its mechanical property is: R
m770-840MPa, R
EL510-555MPa, A 16.5-20%, Z 60-65%.Adopt the high strength bolt performance of this gren rod production to be: R
m1010-1070MPa, R
EL990-1030MPa, A 15-16.5%, Z 58-64.5%.The present invention has improved the intensity rank to 10.9 grade of non-quenched cold heading steel, has solved the low cold-heading and the low flexible difficult problem of traditional non-quenched cold heading steel gren rod, is suitable for the bigger high strength fastening pieces such as high strength bolt of production cold-heading deformation processing amount.Adopt this wire rod to make 10.9 grades of fastening pieces, directly change system into the technology material, cold-heading molding on cold headers, operation is simplified, and visual appearance is good, saves annealing and modified thermal treatment expense, reduces and pollutes, and avoids surface decarburization, enhances productivity.And by adopting the low temperature cooling controlling and rolling controlling process, make that the cheap alloy adding of microalloy element add-on or other is less, help economizing on resources and the equilibrium utilization of resource.
Embodiment
According to chemical ingredients scope of the present invention, adopt converter smelting, external refining, continuous casting to become the 140mm square billet, after the heating, on high-speed wire mill, carry out controlled rolling and controlled cooling, collect volume, cooling, bundling, warehouse-in then, specific embodiment is as follows:
Embodiment 1:
Select for use chemical ingredients to be: C-0.08%, Si-0.35%, Mn-2.30%, P-0.018%, S-0.007%, B-0.0025%, Ti-0.022%, Cr-0.36%, Als-0.018%.Rolling technology is: soaking temperature is 1140-1220 ℃ in the process furnace; Slightly, in roll rolling temperature 1000-1050 ℃, roughing, in roll, technology is rolling routinely in pre-finish rolling; Low temperature rolling is adopted in finish rolling, and be specially: temperature is 750 ℃, and deflection is 60%, and rate of deformation is 20/s, weaves silk at 730 ℃ after the deformation; Controlled chilling speed is then: take the cooling rate of 5.5 ℃/s cold soon more than 550 ℃, less than 550 ℃ of cooling rate slow cooling of taking 0.1 ℃/s.Obtain being organized as the hot rolling wire of granular bainite, mechanical property is: R
m-780MPa, A-20%, Z-65%.
Embodiment 2:
Select for use chemical ingredients to be: C-0.10%, Si-0.30%, Mn-2.00%, P-0.015%, S-0.011%, B-0.0030%, Ti-0.016%, Cr-0.30%, Als-0.038%.Rolling technology is: soaking temperature is 1140-1220 ℃ in the process furnace; Slightly, in roll rolling temperature 1000-1050 ℃, roughing, in roll, technology is rolling routinely in pre-finish rolling; Low temperature rolling is adopted in finish rolling, and be specially: temperature is 780 ℃, and deflection is 60%, and rate of deformation is 20/s, weaves silk at 750 ℃ after the deformation; Controlled chilling speed is then: take 6 ℃/s cooling rate cold soon more than 550 ℃, take the slow cooling of 0.5 ℃/s cooling rate less than 550 ℃.Obtain being organized as the hot rolling wire of granular bainite, mechanical property is: R
m-800MPa, A-18%, Z-61%.
Embodiment 3;
Select for use chemical ingredients to be: C-0.12%, Si-0.15%, Mn-1.80%, P-0.012%, S-0.004%, B-0.0008%, Ti-0.010%, Cr-0.25%, Als-0.028%.Rolling technology is: soaking temperature is 1140-1220 ℃ in the process furnace; Slightly, in roll rolling temperature 1000-1050 ℃, roughing, in roll, technology is rolling routinely in pre-finish rolling; Low temperature rolling is adopted in finish rolling, and be specially: temperature is 800 ℃, and deflection is 50%, and rate of deformation is 20/s, weaves silk at 760 ℃ after the deformation; Controlled chilling speed is then: take 5.0 ℃/s cooling rate cold soon more than 550 ℃, take the slow cooling of 1.2 ℃/s cooling rate less than 550 ℃.Obtain being organized as the hot rolling wire of granular bainite, mechanical property is: R
m-820MPa, A-17%, Z-60%.
Embodiment 4:
Select for use chemical ingredients to be: C-0.14%, Si-0.03%, Mn-1.90%, P-0.008%, S-0.005%, B-0.0015%, Ti-0.012%, Cr-0.20%, Als-0.050%.Rolling technology is: soaking temperature is 1140-1220 ℃ in the process furnace; Slightly, in roll rolling temperature 1000-1050 ℃, roughing, in roll, technology is rolling routinely in pre-finish rolling; Low temperature rolling is adopted in finish rolling, and be specially: temperature is 820 ℃, and deflection is 55%, and rate of deformation is 20/s, weaves silk at 780 ℃ after the deformation; Controlled chilling speed is then: take 6.5 ℃/s cooling rate cold soon more than 550 ℃, less than taking the slow cooling of 2.5 ℃/s cooling rate below 550 ℃.Obtain being organized as the hot rolling wire of granular bainite, mechanical property is: R
m-840MPa, A-16%, Z-58%.
Claims (6)
1, a kind of 10.9 grade chromium-containing non-quenched cold heading steels, it is characterized in that the weight percent of its component (%) is: C0.08%-0.14%, Si 0.03%-0.35%, Mn 1.80%-2.30%, P≤0.025%, S≤0.015%, B0.0005%-0.003%, Ti0.01%-0.03%, Als0.010%-0.050%, Cr 0.20%-0.40%, all the other are iron and trace impurity.
2,10.9 grade chromium-containing non-quenched cold heading steels as claimed in claim 1, it is characterized in that the weight percent of its component (%) is: C0.08%-0.12%, Si0.15%-0.35%, Mn 1.80%-2.30%, P≤0.025%, S≤0.015%, B0.0008%-0.003%, Ti0.010%-0.022%, Als 0.022%-0.045%, Cr0.25%-0.36%, all the other are iron and trace impurity.
3,10.9 grade chromium-containing non-quenched cold heading steels as claimed in claim 1 or 2, it is characterized in that the weight percent of its component (%) is: C 0.10%, Si 0.30%, Mn 2.0%, P≤0.025%, S≤0.015%, B 0.003%, Ti0.016%, Als0.045%, Cr0.30%, all the other are iron and trace impurity.
4, a kind of rolling method of 10.9 grade chromium-containing non-quenched cold heading steel gren rods as claimed in claim 1, steel billet heats the back and is rolled on high-speed rod-rolling mill in process furnace, collection is rolled up then, cooling, bundling, warehouse-in, it is characterized in that, Heating temperature 1050-1250 ℃, slightly, in roll rolling temperature 1000-1050 ℃, final rolling temperature 750-830 ℃, deflection is 50-60%, rate of deformation is 20/s, and laying temperature 730-850 ℃, the back wire rod of weaving silk divides two sections controlled chilling, cooling rate with 〉=5 ℃/s more than 550 ℃ is cold soon, less than 550 ℃ of cooling rate slow cooling with 0.1-3 ℃/s.
5, the rolling method of 10.9 grade chromium-containing non-quenched cold heading steel gren rods as claimed in claim 4, it is characterized in that, Heating temperature 1140-1220 ℃, thick, in roll rolling temperature 1000-1050 ℃, final rolling temperature 750-780 ℃, deflection is 55-60%, rate of deformation is 20/s, and laying temperature 730-750 ℃, the back wire rod of weaving silk divides two sections controlled chilling, cooling rate with 5.0-5.5 ℃/s more than 550 ℃ is cold soon, less than 550 ℃ of cooling rate slow cooling with 0.1-0.5 ℃/s.
6, as the rolling method of claim 4 or 5 described 10.9 grade chromium-containing non-quenched cold heading steel gren rods, it is characterized in that, 1180 ℃ of Heating temperatures, thick, in roll rolling temperature 1000-1050 ℃, 750 ℃ of final rolling temperatures, deflection is 60%, rate of deformation is 20/s, 730 ℃ of laying temperatures, and the back wire rod of weaving silk divides two sections controlled chilling, cooling rate with 5.5 ℃/s more than 550 ℃ is cold soon, less than 550 ℃ of cooling rate slow cooling with 0.1 ℃/s.
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