CN1050909A - Structural low - Google Patents
Structural low Download PDFInfo
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- CN1050909A CN1050909A CN 90109478 CN90109478A CN1050909A CN 1050909 A CN1050909 A CN 1050909A CN 90109478 CN90109478 CN 90109478 CN 90109478 A CN90109478 A CN 90109478A CN 1050909 A CN1050909 A CN 1050909A
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Abstract
Steel of the present invention belongs to the structural alloy steel field.It is the low-carbon alloy structural steel of a kind of high strength, high tenacity, high-hardenability.
The concrete Chemical Composition of steel of the present invention is C0.18-0.23%, Si0.40-0.60%, and Mn1.8-2.1%, Ni1.0-1.5%, Mo0.4-0.6%, W0.4-0.6%, all the other are Fe for Cu≤0.3.The smelting of steel of the present invention can be carried out in open hearth, electric furnace or induction furnace.Through forge or rolling after greater than 900 ℃ of quenchings and 200 ℃ of tempering.Characteristics such as steel of the present invention has good combination property compared with prior art, and steel interalloy constituent content is low, and deep and thorough property height and production technique are simple.
Description
The invention belongs to the low-carbon and low-alloy structural steel that the structural alloy steel field is a kind of high strength, high tenacity, high-hardenability.
In the low-carbon and low-alloy structural steel field, because people to the performance requriements difference of steel, therefore to the composition and the performance index of design structural low, all go to consider with different aspects.In U.S. Pat-3562028 low-carbon low-alloy steel of being introduced, not tungstenic and molybdenum, its intensity and toughness are all very low, and this is determined by the tissue of this steel (ferrite+perlite).Belong to the structural low field though Japan special permission disclose that clear 52-1118 introduces for another example,, have only 84kg/mm so tensile strength is the highest, and the toughness of this steel grade is not done requirement owing to its carbon content is low excessively.What clear 62-77441 introduced in addition is a kind of high-intensity steel wire, and higher because of the carbon content of this steel, so the tensile strength of this steel can reach 130-332kg/mm, but the toughness of this steel is not done requirement yet.
The purpose of this invention is to provide a kind of high strength that has, high tenacity, the low-carbon and low-alloy structural steel of high-hardenability.
For achieving the above object, be (weight %) C0.18-0.23% by the concrete chemical ingredients of the designed low-carbon and low-alloy high performance structures steel of the present invention; Si0.40-0.60%; Mn1.80-2.10%; Ni1.0-1.5%; Mo0.4-0.6%; W0.4-0.6%; Cu≤0.3; All the other are Fe.
Think that by the result of study to low-carbon martensitic steels for many years the substructure form of low carbon martensite is a lath-shaped, confirm low martensitic simultaneously under high-intensity situation, still have the major cause of high tenacity to be, have the retained austenite film on the lath border.Consider above-mentioned reason, steel of the present invention is decided to be 0.18～0.23% with carbon content, makes steel have the lath martensite tissue.Prove C content by experiment less than 0.16%, not only intensity reduces, and hardening capacity also obviously reduces, if keep the steel grade performance not reduce, requires then that C content should not be lower than 0.18% in the steel.The Mn element is the bioelement that guarantees hardening capacity and strengthen sosoloid in steel of the present invention, and Mn also helps at martensite lath shape border formation retained austenite film simultaneously, thereby reaches the purpose of the toughness that improves steel.But the Mn too high levels, though favourable to the hardening capacity that improves steel, destroyed the malleableize effect, so the present invention fixes on 1.80～2.10% with Mn content.Mo, W are neccessary composition equally in the present invention, the experiment proved that, the composite alloying of Mo+W is extremely useful to over-all properties, and add Mo separately or W does not reach this effect, and therefore Mo content is that 0.4-0.6%W is 0.4-0.6% in steel of the present invention.In steel of the present invention,, then in steel, add the nickel of 1.0-1.5% and comprise copper below 0.3% in order further to improve the malleableize effect and the over-all properties of steel.
The smelting of steel of the present invention can be carried out in open hearth, electric furnace and induction furnace.Through forge or rolling after 900 ℃ of-950 ℃ of quenchings, again in 200 ℃ of-250 ℃ of tempering.Quenching, tempering all can be adopted oil cooling or air cooling.
Steel of the present invention has good combination property compared with prior art, and steel interalloy constituent content is low, and well dark hardening capacity is arranged, and also to have production technique simple for this steel grade simultaneously, characteristics such as product percent of pass height.
Embodiment:
The composition scope of steel according to the present invention, we have smelted the structural low of four kinds of compositions, and its concrete chemical ingredients and smelting process see Table 1.After 910 ℃ of quenchings and 200 ℃ of tempering, its mechanical property sees Table 2 to steel ingot through forging rolling.
The Chemical Composition of table 1, steel of the present invention and smelting technology (weight %)
| Plain number of unit's preface | C | Si | Mn | Mo | W | Ni | Cu | Fe | Remarks |
| 1 | 0.21 | 0.56 | 1.92 | 0.46 | 0.43 | 1.18 | 0.30 | Surplus | High frequency furnace |
| 2 | 0.23 | 0.60 | 1.98 | 0.47 | 0.46 | 1.23 | 0.1 | Surplus | High frequency furnace |
| 3 | 0.20 | 0.42 | 2.10 | 0.48 | 0.49 | 1.05 | 0.29 | Surplus | 0.5T electric furnace |
| 4 | 0.22 | 0.58 | 1.86 | 0.42 | 0.40 | 1.40 | 0.25 | Surplus | The 5T electric furnace |
The mechanical property of table 2, steel of the present invention
| The performance sequence number | σbkg/mm 2 | δ 5％ | ψ％ | αK?kgM/cm 2 | Remarks |
| 1 | 154.8 | 12.3 | 52.2 | 10.0 | |
| 2 | 161.2 | 11.3 | 52.2 | 9.0 | |
| 3 | 151.0 | 13.5 | 57.5 | 11.9 | |
| 4 | 154.6 | 11.0 | 41.6 | 8 |
Claims (1)
1, the low-carbon and low-alloy structural steel of a kind of high strength, high tenacity, high-hardenability is characterized in that the concrete chemical ingredients of this steel is (weight %) C0.18-0.23%; Si0.40-0.60; Mn1.80-2.10%; Ni1.0-1.5%; Mo0.40-0.60%; W%0.40-0.60%; Cu≤0.3%; All the other are Fe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90109478 CN1019588B (en) | 1990-12-03 | 1990-12-03 | Low-alloy structural steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90109478 CN1019588B (en) | 1990-12-03 | 1990-12-03 | Low-alloy structural steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1050909A true CN1050909A (en) | 1991-04-24 |
| CN1019588B CN1019588B (en) | 1992-12-23 |
Family
ID=4881449
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90109478 Expired CN1019588B (en) | 1990-12-03 | 1990-12-03 | Low-alloy structural steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1019588B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1039246C (en) * | 1995-05-03 | 1998-07-22 | 冶金工业部钢铁研究总院 | Low-carbon and low-alloy structural steel without chromium and nickel |
| CN102046825B (en) * | 2008-03-26 | 2012-12-26 | 住友金属工业株式会社 | High-strength UOE steel pipe excellent in earthquake-proof performance and in low-temperature toughness of weld heat-affected zone |
-
1990
- 1990-12-03 CN CN 90109478 patent/CN1019588B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1039246C (en) * | 1995-05-03 | 1998-07-22 | 冶金工业部钢铁研究总院 | Low-carbon and low-alloy structural steel without chromium and nickel |
| CN102046825B (en) * | 2008-03-26 | 2012-12-26 | 住友金属工业株式会社 | High-strength UOE steel pipe excellent in earthquake-proof performance and in low-temperature toughness of weld heat-affected zone |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1019588B (en) | 1992-12-23 |
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