CN1036231A - Bainite steel of high strength and tenacity - Google Patents
Bainite steel of high strength and tenacity Download PDFInfo
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- CN1036231A CN1036231A CN 89100347 CN89100347A CN1036231A CN 1036231 A CN1036231 A CN 1036231A CN 89100347 CN89100347 CN 89100347 CN 89100347 A CN89100347 A CN 89100347A CN 1036231 A CN1036231 A CN 1036231A
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- steel
- high strength
- tenacity
- bainite
- bainite steel
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Abstract
The contained chemical ingredients of bainite steel of high strength and tenacity of the present invention is (weight %) 0.09～0.15%C, 1.0～2.0%Si, and 2.8～3.2%Mn, 0.2～0.3%Mo, all the other are Fe.This steel grade mechanical property high strength is tough to be held concurrently excellently, does not need the large number quipments input, and technology is simple, save the energy, through forging, roll hot-work and air cooling and 300 ℃ of tempering, can use, and does not need modulation treatment.The present invention is a desirable steel grade of making the large section part, bores very (φ 200 * 9000mm) etc. as oil.
Description
Patent of the present invention is to belong to field of metallurgy for the low-alloy high-strength and high-toughness steel.
Disclosed at present Chinese CN85100080 number " low carbon air cooled nodular bainite steel " patent of invention, its main alloy element is Mn, B, its chemical ingredients is " C, Si, Mn, B " or " C, Si, Mn, V ", directly application or tempering and use after forging, rolling the hot-work air cooling, do not need modifier treatment, but its weak point is a plasticity, toughness is on the low side, and smelt difficulty, on using, be restricted.
Has delivered interpolation such as the work that utilizes Ti, V, Nb, rare earth element element in recent years both at home and abroad and obtained complex tissue shaped steel kind, but their weak point is the manufacturing process complexity, needs great deal of investment that the production cost of steel improves by controlled rolling technology.
The objective of the invention is to avoid above-mentioned weak point of the prior art and develop a kind of high-strength and high ductility add the low-carbon bainite steel of a small amount of Mo as main added elements with Si, Mn.
Along with going deep into to the bainite research work, find that the Si element has great effect to bainite form and performance, the structural alloy steel that contains Si is through suitable isothermal processes or through the necessarily continuous cooling of cooling rate, can form a kind of special bainite, carbide precipitate not between the ferrite lath of this bainite or in the lath, but there are stable residual austenite film (being referred to as meta-bainite) or compound along the tissue (being referred to as granular bainite) on (M-A) island that the lath direction is arranged and this tissue, above-mentioned organizing all has good combination of strength and toughness, in order to help the formation of above-mentioned tissue, should reduce the carbon content in the steel as far as possible, cause the decline of intensity in order to remedy the reduction of carbon amount, the Mn that should add higher amount, ferrite do not occur in order to obtain big as far as possible bainite hardening capacity, it also is necessary adding a spot of Mo.
Above-mentioned low-carbon bainite steel with Si, Mn, Mo alloying, 1050 ℃～930 ℃ forgings, roll hot-work after in air continuously the cooling.Again through 300 ℃ of low-temperaturetemperings, not only manufacturing process is simple, save energy, economic benefit height, and can obtain the good combination of high-intensity high-tenacity, and its performance can reach or the quenched and tempered steel of the high tempering that is better than quenching.
The composition range of steel grade of the present invention is:
C 0.09～0.15% Si 1.0～2.0%
Mn 2.8～3.2% Mo 0.2～0.3%
All the other are Fe.(weight %)
Steel grade of the present invention can be in electric arc furnace routinely technology smelt, forge, roll heat processing technique, see embodiment
The embodiment of steel grade of the present invention such as following table
| Grade of steel | Chemical ingredients % | Processing and disposition | |||
| C | Si | Mn | Mo | ||
| 1 | 0.13 | 1.18 | 2.86 | 0.23 | 1050 ℃～930 ℃ forgings or rolling, air cooling (930～400 ℃ of 150～240 minutes cooling times), 300 ℃ of tempering. |
| 2 | 0.11 | 1.25 | 3.15 | 0.25 | |
| 3 | 0.15 | 1.26 | 3.16 | 0.24 | |
| 4 | 0.16 | 1.13 | 2.93 | 0.24 | |
| 5 | 0.15 | 1.63 | 3.14 | 0.20 | |
Mechanical property
Steel grade of the present invention has been used to produce the oil brill, and very (φ 200 * 9000mm), and its performance cocoa reaches: σ
b〉=110kg/mm
2
σ
0.2≥85kg/mm
2δ
5≥13% ψ≥50%
a
KU≥10kg/cm
2a
KV≥7kg/cm
2
The present invention has following advantage compared to existing technology:
1. the low-carbon bainite steel that has high strength, high tenacity.
2. can make the desirable steel grade of heavy in section part.
3. simplify technology, save the large number quipments input, have obvious economic benefit.
Claims (3)
1, a kind of high-strength and high-ductility Si-Mn-Mo is a low-carbon bainite steel, it is characterized in that adopting Si and Mn as main alloy element.
2, the Si-Mn-Mo by the high-strength and high ductility of claim 1 indication is a low-carbon bainite steel, and the composition of its feature is:
C 0.09～0.15% Si 1.0～2.0%
Mn 2.8～3.2% Mo 0.2～0.3%
All the other are Fe(weight %)
3, the Si-Mn-Mo by the high-strength and high ductility of claim 1.2 indications is a low-carbon bainite steel, and the technology of its feature is:
1050 ℃～930 ℃ forgings or rolling are cooled off in air, again through 300 ℃ of low-temperaturetemperings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89100347 CN1036231A (en) | 1989-01-18 | 1989-01-18 | Bainite steel of high strength and tenacity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89100347 CN1036231A (en) | 1989-01-18 | 1989-01-18 | Bainite steel of high strength and tenacity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1036231A true CN1036231A (en) | 1989-10-11 |
Family
ID=4853809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89100347 Pending CN1036231A (en) | 1989-01-18 | 1989-01-18 | Bainite steel of high strength and tenacity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1036231A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100387746C (en) * | 2005-04-18 | 2008-05-14 | 河南省强力机械有限公司 | Quasi bainitic steel and its application in rail way industry |
| CN100408712C (en) * | 2005-04-18 | 2008-08-06 | 河南省强力机械有限公司 | Quasi bainitic steel |
| CN105397438A (en) * | 2015-12-31 | 2016-03-16 | 武汉江钻恒立工程钻具股份有限公司 | Manufacture method of way-type drilling unit |
-
1989
- 1989-01-18 CN CN 89100347 patent/CN1036231A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100387746C (en) * | 2005-04-18 | 2008-05-14 | 河南省强力机械有限公司 | Quasi bainitic steel and its application in rail way industry |
| CN100408712C (en) * | 2005-04-18 | 2008-08-06 | 河南省强力机械有限公司 | Quasi bainitic steel |
| CN105397438A (en) * | 2015-12-31 | 2016-03-16 | 武汉江钻恒立工程钻具股份有限公司 | Manufacture method of way-type drilling unit |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| CI01 | Correction of invention patent gazette |
Correction item: Agency Agent Correct: Northwest Patent Office of Ministry of Aeronautics and Astronautics Industry|Song Xianbo False: Unlisted Agency, Agent Number: 41 Volume: 5 |
|
| ERR | Gazette correction |
Free format text: CORRECT: AGENT; FROM: NOT ISSUED TO: SONG XIANBO |
|
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |