CN104532125B - A kind of high-strength engineering machinery steel and preparation method thereof - Google Patents
A kind of high-strength engineering machinery steel and preparation method thereof Download PDFInfo
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- CN104532125B CN104532125B CN201410800686.2A CN201410800686A CN104532125B CN 104532125 B CN104532125 B CN 104532125B CN 201410800686 A CN201410800686 A CN 201410800686A CN 104532125 B CN104532125 B CN 104532125B
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Abstract
The present invention relates to a kind of high-strength engineering machinery steel and preparation method thereof. Its technical scheme is: be casting continuously to form base after converter smelting, refine; Strand is heated, and heating-up 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; Two-stage cooling mode is adopted: first paragraph is cooled to 720 ~ 760 DEG C with the rate of cooling of 3 ~ 6 DEG C/s, and second segment is cooled to 560 ~ 600 DEG C with the rate of cooling of 30 ~ 50 DEG C/s after rolling; Batch rear air cooling to room temperature. Chemical composition and the content thereof of described strand is: 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. The present invention has that production cost is low and the simple feature of technique, and prepared high-strength engineering machinery Steel Properties is excellent.
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, the obdurability of engineering machinery construction material is required more prominent, thus having promoted that the exploitation of steel for engineering machinery and production constantly develop to higher intensity rank, more excellent combination property direction.
" the super thick steel for engineering machinery of yield strength >=550MPa and production method " (CN103540850A) patented technology, its chemical composition and content thereof is: 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 adopts water-cooled+temper, complex process after rolling, cost is high, and performance is relatively low, yield strength >=550MPa.
" a kind of ultrahigh-strength steel plates and production method " thereof (CN103725985A) patented technology, its chemical composition and content thereof is: 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 in this steel after the alloying elements such as more Cr, Mo and Ni, controlled rolling and control cool down and also need modifier treatment, production process is more and cost high.Although yield strength is up to 1200 ~ 1300MPa, but elongation percentage 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 is: 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, adopts the four-part form type of cooling after rolling, and technology controlling and process is complicated, poor stability.
In summary it can be seen, the high-strength engineering machinery steel produced at present generally adds more alloying element, adopts quickly cooling+Technology for Heating Processing or four-part form cooling technique, complex process after rolling, and production cost is high.
Summary of the invention
It is contemplated that overcome prior art defect, it is therefore an objective to providing a kind of production cost the low preparation method with the simple high-strength engineering machinery steel of technique, 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: be casting continuously to form base after converter smelting, refine; Strand is heated, and heating-up 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; Two-stage cooling mode is adopted: first paragraph is cooled to 720 ~ 760 DEG C with the rate of cooling of 3 ~ 6 DEG C/s, and second segment is cooled to 560 ~ 600 DEG C with the rate of cooling of 30 ~ 50 DEG C/s after rolling; Batch rear air cooling to room temperature.
Chemical composition and the content thereof of described strand is: 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 good effect:
The present invention adopts hot rolling and rolls rear two-stage cooling mode, it is not necessary to carrying out heat treatment, technology controlling and process is simple. Two-stage cooling mode is adopted after rolling, after first paragraph Slow cooling, steel is still in austenite phase field, then quickly cooling makes rapid chilling section through ferrite and pearlite phase region, eventually enters into bainite phase region, it is thus achieved that tiny bainite+ferrite+pearlitic structrure; Meanwhile, control microalloy to precipitate out in a large number at rapid chilling section, it is thus achieved that a large amount of tiny precipitates, 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 elongation percentage is 19 ~ 21%.
Therefore, the present invention has that production cost is low and the simple feature of technique, and prepared high-strength engineering machinery Steel Properties is excellent.
Detailed description of the invention
Below in conjunction with detailed description of the invention, 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: be casting continuously to form base after converter smelting, refine; Strand is heated, and heating-up 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;Two-stage cooling mode is adopted: first paragraph is cooled to 720 ~ 750 DEG C with the rate of cooling of 3 ~ 5 DEG C/s, and second segment is cooled to 575 ~ 590 DEG C with the rate of cooling of 35 ~ 40 DEG C/s after rolling; Batch rear air cooling to room temperature.
Chemical composition and the content thereof of strand described in the present embodiment is: 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 elongation percentage is 20.0 ~ 20.7%.
Embodiment 2
A kind of high-strength engineering machinery steel and preparation method thereof. Its preparation method is: be casting continuously to form base after converter smelting, refine; Strand is heated, and heating-up 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; Two-stage cooling mode is adopted: first paragraph is cooled to 735 ~ 760 DEG C with the rate of cooling of 4 ~ 5 DEG C/s, and second segment is cooled to 580 ~ 595 DEG C with the rate of cooling of 45 ~ 50 DEG C/s after rolling; Batch rear air cooling to room temperature.
Chemical composition and the content thereof of strand described in the present embodiment is: 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 elongation percentage is 19.6 ~ 20.2%.
Embodiment 3
A kind of high-strength engineering machinery steel and preparation method thereof. Its preparation method is: be casting continuously to form base after converter smelting, refine; Strand is heated, and heating-up 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; Two-stage cooling mode is adopted: first paragraph is cooled to 720 ~ 745 DEG C with the rate of cooling of 3 ~ 4 DEG C/s, and second segment is cooled to 560 ~ 580 DEG C with the rate of cooling of 40 ~ 45 DEG C/s after rolling; Batch rear air cooling to room temperature.
Chemical composition and the content thereof of strand described in the present embodiment is: 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 elongation percentage is 19 ~ 19.6%.
Embodiment 4
A kind of high-strength engineering machinery steel and preparation method thereof. Its preparation method is: be casting continuously to form base after converter smelting, refine; Strand is heated, and heating-up 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; Two-stage cooling mode is adopted: first paragraph is cooled to 740 ~ 760 DEG C with the rate of cooling of 5 ~ 6 DEG C/s, and second segment is cooled to 585 ~ 600 DEG C with the rate of cooling of 30 ~ 35 DEG C/s after rolling; Batch rear air cooling to room temperature.
Chemical composition and the content thereof of strand described in the present embodiment is: 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 elongation percentage is 20.5 ~ 21%.
This detailed description of the invention compared with prior art has following good effect:
This detailed description of the invention adopts hot rolling and rolls rear two-stage cooling mode, it is not necessary to carrying out heat treatment, technology controlling and process is simple. Two-stage cooling mode is adopted after rolling, after first paragraph Slow cooling, steel is still in austenite phase field, then quickly cooling makes rapid chilling section through ferrite and pearlite phase region, eventually enters into bainite phase region, it is thus achieved that tiny bainite+ferrite+pearlitic structrure; Meanwhile, control microalloy to precipitate out in a large number at rapid chilling section, it is thus achieved that a large amount of tiny precipitates, 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 elongation percentage is 19 ~ 21%.
Therefore, this detailed description of the invention has that production cost is low and the simple feature of technique, and prepared high-strength engineering machinery Steel Properties is excellent.
Claims (2)
1. the preparation method of a high-strength engineering machinery steel, it is characterised in that described preparation method is: be casting continuously to form base after converter smelting, refine; Strand is heated, and heating-up 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; Two-stage cooling mode is adopted: first paragraph is cooled to 720 ~ 760 DEG C with the rate of cooling of 3 ~ 6 DEG C/s, and second segment is cooled to 560 ~ 600 DEG C with the rate of cooling of 30 ~ 50 DEG C/s after rolling; Batch rear air cooling to room temperature;
Chemical composition and the content thereof of described strand is: 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, it is characterised in that described high-strength engineering machinery steel is the high-strength engineering machinery steel prepared by the preparation method of high-strength engineering machinery steel according to claim 1.
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| CN104532125B true CN104532125B (en) | 2016-06-08 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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