CN104532125A - High-strength steel for engineering machines and preparation method of high-strength steel - Google Patents
High-strength steel for engineering machines and preparation method of high-strength steel Download PDFInfo
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- CN104532125A CN104532125A CN201410800686.2A CN201410800686A CN104532125A CN 104532125 A CN104532125 A CN 104532125A CN 201410800686 A CN201410800686 A CN 201410800686A CN 104532125 A CN104532125 A CN 104532125A
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Abstract
The invention relates to high-strength steel for engineering machines and a preparation method of the high-strength steel. A technical scheme is as follows: the preparation method of the steel comprises the following steps: performing converter smelting and refining, and then performing continuous casting to form blanks; heating casting blanks under the condition that the heating temperature is 1150-1250 DEG C; performing rough rolling at rolling starting temperature of 1100-1150 DEG C, performing precision rolling at rolling starting temperature of 915-960 DEG C, and performing finishing rolling at temperature of 820-880 DEG C; cooling by adopting a two-section type cooling mode after rolling: cooling a first section to 720-760 DEG C at cooling speed of 3-6 DEG C/s, and cooling a second section to 560-600 DEG C at cooling speed of 30-50 DEG C/s; and coiling, and performing air cooling to room temperature. The casting blanks comprise the following chemical components in percentage by weight: 0.06-0.10wt% of C, 1.35-1.55wt% of Mn, 0.35-0.50wt% of Si, less than or equal to 0.02wt% of P, less than or equal to 0.01wt% of S, 0.14-0.16wt% of Ti, 0.10-0.15wt% of Mo, 0.04-0.06wt% of Nb and the balance of Fe and inevitable impurities. The preparation method disclosed by the invention has the characteristics of low production cost and simple process, and the prepared high-strength steel for the engineering machines is excellent in performance.
Description
Technical field
The invention belongs to high-strength engineering machinery steel technical field.Particularly relate to a kind of high-strength engineering machinery steel and preparation method thereof.
Background technology
Along with engineering machinery is to maximization, lightweight development, require more outstanding to the obdurability of engineering machinery construction material, thus the development and production facilitating steel for engineering machinery is constantly to more high intensity levels, more excellent over-all properties future development.
" the super thick steel for engineering machinery of yield strength >=550MPa and production method " (CN103540850A) patented technology, its chemical composition and content thereof are: C is 0.07 ~ 0.11wt%, Mn is 1.35 ~ 1.60wt%, Si be 0.25 ~ 0.5wt%, Nb is 0.04 ~ 0.06wt%, Ti is 0.005 ~ 0.018wt%, P≤0.020wt%, S≤0.010wt%, Cr is 0.25 ~ 0.35wt%, B is 0.0008 ~ 0.0020wt%, and all the other are Fe and inevitable impurity.This technology rolls rear employing water-cooled+temper, complex process, and cost is high, and performance is lower, yield strength >=550MPa.
" a kind of ultrahigh-strength steel plates and production method thereof " (CN103725985A) patented technology, its chemical composition and content thereof are: C is 0.14 ~ 0.2wt%, Si is 0.2 ~ 0.5wt%, Mn is 0.6 ~ 1.0wt%, P≤0.010wt%, S≤0.006wt%, Al is 0.02 ~ 0.05wt%, Cr is 0.3 ~ 0.8wt%, Mo be 0.3 ~ 0.6wt%, Ni is 0.3 ~ 1.0wt%, Nb is 0.01 ~ 0.05wt%, Ti is 0.01 ~ 0.05wt%, and all the other are Fe and inevitable impurity, and carbon equivalent is 0.59 ~ 0.64.With the addition of the alloying elements such as more Cr, Mo and Ni in this steel, also need modifier treatment after controlled rolling and controlled cooling model, production process is more and cost is high.Although yield strength is up to 1200 ~ 1300MPa, unit elongation only has 9 ~ 12%.
" a kind of yield strength >=750MPa steel for engineering machinery and production method thereof " (CN103305767A) technical patent, its chemical composition and content thereof are: C is 0.07 ~ 0.11wt%, Mn is 1.30 ~ 1.60wt%, Si be 0.25 ~ 0.5wt%, Nb is 0.04 ~ 0.06wt%, Ti is 0.005 ~ 0.018wt%, P≤0.020wt%, S≤0.010wt%, Cr is 0.25 ~ 0.35wt%, B is 0.0008 ~ 0.0020wt%, Ca is 0.001 ~ 0.005wt%.The smelting process of this technology needs to carry out Calcium treatment, rolls the rear employing four-part form type of cooling, and technology controlling and process is complicated, poor stability.
In summary it can be seen, the high-strength engineering machinery steel produced at present adds more alloying element usually, and roll rear employing and cool fast+thermal treatment process or four-part form process for cooling, complex process, production cost is high.
Summary of the invention
The present invention is intended to overcome prior art defect, and object is to provide the preparation method of the low and simple high-strength engineering machinery steel of technique of a kind of production cost, and the high-strength engineering machinery steel mechanical property prepared by the method is excellent.
For achieving the above object, the technical solution used in the present invention is: after converter smelting, refining, continuous casting becomes base; To strand heating, Heating temperature is 1150 ~ 1250 DEG C; Roughing start rolling temperature is 1100 ~ 1150 DEG C, and finish rolling start rolling temperature is 915 ~ 960 DEG C, and finishing temperature is 820 ~ 880 DEG C; Roll rear employing two-stage cooling mode: first paragraph is cooled to 720 ~ 760 DEG C with the speed of cooling of 3 ~ 6 DEG C/s, and second segment is cooled to 560 ~ 600 DEG C with the speed of cooling of 30 ~ 50 DEG C/s; Batch rear air cooling to room temperature.
Chemical composition and the content thereof of described strand are: C is 0.06 ~ 0.10wt%, Mn be 1.35 ~ 1.55wt%, Si is 0.35 ~ 0.50wt%, P≤0.02wt%, S≤0.01wt%, Ti is 0.14 ~ 0.16wt%, Mo is 0.10 ~ 0.15wt%, Nb is 0.04 ~ 0.06wt%, and all the other are Fe and inevitable impurity.
Owing to adopting technique scheme, the present invention compared with prior art has following positively effect:
The present invention adopts hot rolling and rolls rear two-stage cooling mode, and do not need to heat-treat, technology controlling and process is simple.Roll rear employing two-stage cooling mode, after first paragraph Slow cooling, steel is still in austenite phase field, then cooling makes rapid chilling section pass ferrite and pearlite phase region fast, finally enters bainite phase region, obtains tiny bainite+ferrite+pearlitic structure; Meanwhile, control microalloy and separate out in a large number at rapid chilling section, obtain a large amount of tiny precipitate, improved the performance of steel by refined crystalline strengthening and precipitation strength.The mechanical property of prepared high-strength engineering machinery steel is: yield strength is 704 ~ 752MPa, tensile strength 829 ~ 893MPa, and unit elongation is 19 ~ 21%.
Therefore, the present invention has the low and simple feature of technique of production cost, and prepared high-strength engineering machinery Steel Properties is excellent.
Embodiment
Below in conjunction with embodiment, the invention will be further described, not limiting the scope of the invention.
embodiment 1
A kind of high-strength engineering machinery steel and preparation method thereof.Its preparation method is: after converter smelting, refining, continuous casting becomes base; To strand heating, Heating temperature is 1150 ~ 1190 DEG C; Roughing start rolling temperature is 1100 ~ 1130 DEG C, and finish rolling start rolling temperature is 930 ~ 950 DEG C, and finishing temperature is 820 ~ 850 DEG C; Roll rear employing two-stage cooling mode: first paragraph is cooled to 720 ~ 750 DEG C with the speed of cooling of 3 ~ 5 DEG C/s, and second segment is cooled to 575 ~ 590 DEG C with the speed of cooling of 35 ~ 40 DEG C/s; Batch rear air cooling to room temperature.
Chemical composition and the content thereof of strand described in the present embodiment are: C is 0.06 ~ 0.08wt%, Mn is 1.40 ~ 1.45wt%, Si is 0.35 ~ 0.40wt%, P≤0.02wt%, S≤0.01wt%, Ti are 0.155 ~ 0.16wt%, Mo is 0.12 ~ 0.14wt%, Nb is 0.05 ~ 0.06wt%, and all the other are Fe and inevitable impurity.
The mechanical property of the high-strength engineering machinery steel prepared by the present embodiment is: yield strength is 711 ~ 729MPa, and tensile strength is 837 ~ 856MPa, and unit elongation is 20.0 ~ 20.7%.
embodiment 2
A kind of high-strength engineering machinery steel and preparation method thereof.Its preparation method is: after converter smelting, refining, continuous casting becomes base; To strand heating, Heating temperature is 1170 ~ 1210 DEG C; Roughing start rolling temperature is 1120 ~ 1150 DEG C, and finish rolling start rolling temperature is 940 ~ 960 DEG C, and finishing temperature is 840 ~ 870 DEG C; Roll rear employing two-stage cooling mode: first paragraph is cooled to 735 ~ 760 DEG C with the speed of cooling of 4 ~ 5 DEG C/s, and second segment is cooled to 580 ~ 595 DEG C with the speed of cooling of 45 ~ 50 DEG C/s; Batch rear air cooling to room temperature.
Chemical composition and the content thereof of strand described in the present embodiment are: C is 0.08 ~ 0.10wt%, Mn is 1.35 ~ 1.45wt%, Si is 0.35 ~ 0.45wt%, P≤0.02wt%, S≤0.01wt%, Ti are 0.15 ~ 0.155wt%, Mo is 0.10 ~ 0.13wt%, Nb is 0.04 ~ 0.05wt%, and all the other are Fe and inevitable impurity.
The mechanical property of the high-strength engineering machinery steel prepared by the present embodiment is: yield strength is 716 ~ 737MPa, and tensile strength is 845 ~ 867MPa, and unit elongation is 19.6 ~ 20.2%.
embodiment 3
A kind of high-strength engineering machinery steel and preparation method thereof.Its preparation method is: after converter smelting, refining, continuous casting becomes base; To strand heating, Heating temperature is 1200 ~ 1250 DEG C; Roughing start rolling temperature is 1110 ~ 1140 DEG C, and finish rolling start rolling temperature is 920 ~ 945 DEG C, and finishing temperature is 830 ~ 860 DEG C; Roll rear employing two-stage cooling mode: first paragraph is cooled to 720 ~ 745 DEG C with the speed of cooling of 3 ~ 4 DEG C/s, and second segment is cooled to 560 ~ 580 DEG C with the speed of cooling of 40 ~ 45 DEG C/s; Batch rear air cooling to room temperature.
Chemical composition and the content thereof of strand described in the present embodiment are: C is 0.07 ~ 0.09wt%, Mn is 1.45 ~ 1.55wt%, Si is 0.40 ~ 0.45wt%, P≤0.02wt%, S≤0.01wt%, Ti are 0.145 ~ 0.15wt%, Mo is 0.11 ~ 0.14wt%, Nb is 0.05 ~ 0.06wt%, and all the other are Fe and inevitable impurity.
The mechanical property of the high-strength engineering machinery steel prepared by the present embodiment is: yield strength is 732 ~ 752MPa, and tensile strength is 874 ~ 893MPa, and unit elongation is 19 ~ 19.6%.
embodiment 4
A kind of high-strength engineering machinery steel and preparation method thereof.Its preparation method is: after converter smelting, refining, continuous casting becomes base; To strand heating, Heating temperature is 1180 ~ 1220 DEG C; Roughing start rolling temperature is 1100 ~ 1130 DEG C, and finish rolling start rolling temperature is 915 ~ 935 DEG C, and finishing temperature is 850 ~ 880 DEG C; Roll rear employing two-stage cooling mode: first paragraph is cooled to 740 ~ 760 DEG C with the speed of cooling of 5 ~ 6 DEG C/s, and second segment is cooled to 585 ~ 600 DEG C with the speed of cooling of 30 ~ 35 DEG C/s; Batch rear air cooling to room temperature.
Chemical composition and the content thereof of strand described in the present embodiment are: C is 0.06 ~ 0.08wt%, Mn is 1.45 ~ 1.55wt%, Si is 0.45 ~ 0.50wt%, P≤0.02wt%, S≤0.01wt%, Ti are 0.14 ~ 0.145wt%, Mo is 0.13 ~ 0.15wt%, Nb is 0.04 ~ 0.05wt%, and all the other are Fe and inevitable impurity.
The mechanical property of the high-strength engineering machinery steel prepared by the present embodiment is: yield strength is 704 ~ 725MPa, and tensile strength is 829 ~ 846MPa, and unit elongation is 20.5 ~ 21%.
This embodiment compared with prior art has following positively effect:
This embodiment adopts hot rolling and rolls rear two-stage cooling mode, and do not need to heat-treat, technology controlling and process is simple.Roll rear employing two-stage cooling mode, after first paragraph Slow cooling, steel is still in austenite phase field, then cooling makes rapid chilling section pass ferrite and pearlite phase region fast, finally enters bainite phase region, obtains tiny bainite+ferrite+pearlitic structure; Meanwhile, control microalloy and separate out in a large number at rapid chilling section, obtain a large amount of tiny precipitate, improved the performance of steel by refined crystalline strengthening and precipitation strength.The mechanical property of prepared high-strength engineering machinery steel is: yield strength is 704 ~ 752MPa, tensile strength 829 ~ 893MPa, and unit elongation is 19 ~ 21%.
Therefore, this embodiment has the low and simple feature of technique of production cost, and prepared high-strength engineering machinery Steel Properties is excellent.
Claims (2)
1. a preparation method for high-strength engineering machinery steel, is characterized in that described preparation method is: continuous casting becomes base after converter smelting, refining; To strand heating, Heating temperature is 1150 ~ 1250 DEG C; Roughing start rolling temperature is 1100 ~ 1150 DEG C, and finish rolling start rolling temperature is 915 ~ 960 DEG C, and finishing temperature is 820 ~ 880 DEG C; Roll rear employing two-stage cooling mode: first paragraph is cooled to 720 ~ 760 DEG C with the speed of cooling of 3 ~ 6 DEG C/s, and second segment is cooled to 560 ~ 600 DEG C with the speed of cooling of 30 ~ 50 DEG C/s; Batch rear air cooling to room temperature;
Chemical composition and the content thereof of described strand are: C is 0.06 ~ 0.10wt%, Mn be 1.35 ~ 1.55wt%, Si is 0.35 ~ 0.50wt%, P≤0.02wt%, S≤0.01wt%, Ti is 0.14 ~ 0.16wt%, Mo is 0.10 ~ 0.15wt%, Nb is 0.04 ~ 0.06wt%, and all the other are Fe and inevitable impurity.
2. a high-strength engineering machinery steel, is characterized in that described high-strength engineering machinery steel is the high-strength engineering machinery steel prepared by preparation method of high-strength engineering machinery steel according to claim 1.
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| CN201410800686.2A CN104532125B (en) | 2014-12-22 | 2014-12-22 | A kind of high-strength engineering machinery steel and preparation method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101962733A (en) * | 2010-10-29 | 2011-02-02 | 北京科技大学 | Low-cost and high-toughness X80 pipe steel with high deformation resistance and manufacture method thereof |
| CN102226249A (en) * | 2011-06-13 | 2011-10-26 | 马鞍山钢铁股份有限公司 | High-strength hot rolled steel plate with excellent cold forming property and preparation method thereof |
| CN102363858A (en) * | 2011-11-03 | 2012-02-29 | 首钢总公司 | High-strength steel for 750 to 880 MPa-level vehicles and production method thereof |
| JP2012062562A (en) * | 2010-09-17 | 2012-03-29 | Jfe Steel Corp | High-strength hot-rolled steel sheet excellent in punchability and method for producing the same |
| CN103952626A (en) * | 2014-05-12 | 2014-07-30 | 安徽工业大学 | Method for regulating and controlling performances of bainite non-tempered steel for fasteners |
-
2014
- 2014-12-22 CN CN201410800686.2A patent/CN104532125B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012062562A (en) * | 2010-09-17 | 2012-03-29 | Jfe Steel Corp | High-strength hot-rolled steel sheet excellent in punchability and method for producing the same |
| CN101962733A (en) * | 2010-10-29 | 2011-02-02 | 北京科技大学 | Low-cost and high-toughness X80 pipe steel with high deformation resistance and manufacture method thereof |
| CN102226249A (en) * | 2011-06-13 | 2011-10-26 | 马鞍山钢铁股份有限公司 | High-strength hot rolled steel plate with excellent cold forming property and preparation method thereof |
| CN102363858A (en) * | 2011-11-03 | 2012-02-29 | 首钢总公司 | High-strength steel for 750 to 880 MPa-level vehicles and production method thereof |
| CN103952626A (en) * | 2014-05-12 | 2014-07-30 | 安徽工业大学 | Method for regulating and controlling performances of bainite non-tempered steel for fasteners |
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