CN1039246C - Low-carbon and low-alloy structural steel without chromium and nickel - Google Patents
Low-carbon and low-alloy structural steel without chromium and nickel Download PDFInfo
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- CN1039246C CN1039246C CN95104296A CN95104296A CN1039246C CN 1039246 C CN1039246 C CN 1039246C CN 95104296 A CN95104296 A CN 95104296A CN 95104296 A CN95104296 A CN 95104296A CN 1039246 C CN1039246 C CN 1039246C
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Abstract
The present invention provides low carbon low alloy structural steel without chromium or nickel, which relates to the field of alloy structural steel. The low carbon low alloy structural steel without chromium or nickel is suitable for providing structural members and medium plates with large cross section, high strength and high toughness. The low carbon low alloy structural steel without chromium or nickel contains the following concrete chemical components according to a proportion by weight: 0.20 to 0.25% of C, 0.40 to 0.60% of Si, 1.80 to 2.30% of Mn, 0.30 to 0.50% of Mo, 0.40 to 0.60% of W and balance of Fe. The low carbon low alloy structural steel without chromium or nickel has the advantages of low alloy element content, fewer alloy elements, low production cost, simple production technology, high strength and toughness, etc.
Description
The invention belongs to the structural alloy steel field, be applicable to that large section that high strength, high tenacity are provided is with structural part and steel plate.
Structural low field in the prior art, people design the chemical ingredients and the technological process of structural low according to the different requirements of performance to steel.As everyone knows, the weave construction of structural low is lath martensite (being dislocation martensite) and has the retained austenite film on the lath border that its intensity and toughness are all very high.The then existing dislocatrion martensite of 4340 steel that everybody was familiar with also has twin crystal martensite, though its intensity σ
bCan reach 1980MPa, but its toughness is very poor, has only 20J/cm2; The new steel grade 20Si2Mn2CrNiMo of Shanghai Communications University, Xi'an development, although also be the dislocatrion martensite tissue, over-all properties is also fine, but alloying element content (weight %) total in the steel is up to 7%, the element constituent element is also more, Ni:1.5% for example, Cr:1.5%, alloying element content height strengthen the production cost of steel, thereby the alloying element constituent element makes smelting more, hot work operation is all cumbersome slightly, the 18Cr2Ni4WA steel of USSR (Union of Soviet Socialist Republics) widespread use and for example, alloying element content be up to 5%, nearly 7 kinds of alloying element constituent elements, wherein Ni is up to 4～4.5%, Cr:1.35～1.65%.This steel is the cost height not only, and smelting and complete processing are cumbersome slightly, and its strength and toughness cooperation is bad, σ
bBe 1388MPa, a
kBe 140J/cm2.
The object of the present invention is to provide a kind of cheap, simple and the low-carbon and low-alloy structural steel without chromium and nickel of production technique with high strength, high tenacity.
Based on the foregoing invention purpose, the chemical ingredients of the low-carbon and low-alloy structural steel without chromium and nickel that the present invention is designed (weight %) is: C:0.20～0.25%, Si:0.40～0.60%, Mn:1.80～2.30%, Mo:0.30～0.50%, W:0.40～0.60%, surplus is Fe.
Show according to result of study: the weave construction of structural low is lath martensite and has the retained austenite film on the lath border, its intensity and toughness are all very high, for these reasons, steel of the present invention is decided to be 0.20～0.25% with carbon content, make steel have the lath martensite tissue, experiment shows, C＜0.18%, not only intensity reduces, and hardening capacity also can obviously reduce.Mn of the present invention helps can form the retained austenite film on the lath border of lath martensite, thereby can improve the toughness of steel, though but the too high hardening capacity to steel of Mn is favourable, but can destroy its malleableize effect, so Mn of the present invention is designed to (weight %) 1.80～2.30%, experiment showed, that using Mo and W simultaneously is useful to the over-all properties of steel, so it is 0.30～0.50% that the present invention designs Mo (weight %), W (weight %) is: 0.40～0.60%.Characteristics on the chemical composition design of the present invention are: do not contain Cr, Ni, Cu, the content of alloy is little, the production cost of steel is reduced, the constituent element of the alloying element that adds in the production of steel is reduced to 4 kinds, thereby make smelting in the production, hot-work, thermal treatment process simple to operate, be easy to grasp, simultaneously the alloying element of several necessity set, guaranteed the high strength and the high tenacity of steel.
Compared with prior art, the present invention is under the situation of intensity, toughness no-float, its economy both had been better than 18Cr2Ni4WA, also be better than the 20Si2Mn2NiCrMo steel, simultaneously because alloying element constituent element of the present invention is few, and total alloying element content is low, so that production technique such as smelting, hot-work also contrast steel grade is simple, the present invention does not contain Cr, Ni, makes its alloying element select to base on our country.
The smelting of steel of the present invention can be adopted induction furnace and electric furnace, through forge or rolling after at 900～920 ℃ of oil quenchings, again in 200～220 ℃ of tempering water-cooleds.Because the present invention has high hardening capacity, except that being used for the common mechanical part, also can provide high-strength height, high tenacity, the large section is with structural part and steel plate.
Embodiment
The composition range of steel according to the present invention, we have smelted 3 batches of steel of the present invention, and chemical ingredients and smelting process see Table 1.Steel ingot through forge rolling after, in 910 ℃ of left and right sides oil quenchings, in 210 ℃ of left and right sides tempering, its mechanical property sees Table 2.
Table 1 chemical ingredients of the present invention (weight %) and smelting technology
| The element lot number | C％ | Si％ | Mn％ | Mo％ | W％ | Fe | Remarks |
| 1 | 0.25 | 0.53 | 2.25 | 0.50 | 0.60 | All the other | 60KW high frequency stove |
| 2 | 0.205 | 0.48 | 1.97 | 0.39 | 0.59 | All the other | 60KW high frequency stove |
| 3 | 0.20 | 0.42 | 2.12 | 0.47 | 0.47 | All the other | 0.5 ton electric arc furnace |
Table 2 mechanical property of the present invention
| The performance lot number | σ b MPa | δ 5 ％ | φ ％ | χ K J/cm2 | Remarks |
| 1 | 1587.6 | 10.4 | 45.5 | 93.1 | |
| 1612.1 | 11.4 | 39.5 | 88.2 | ||
| 2 | 1470.0 | 9.5 | 32.5 | 125.44 | Pulling force sample defectiveness |
| 1470.0 | 12.0 | 51.5 | 117.6 | ||
| 3 | 1499.4 | 14.0 | 57.0 | 124.46 | |
| 1470.0 | 13.5 | 54.5 | 117.6 | ||
| 1479.8 | 13.0 | 55.5 | 108.78 |
Claims (1)
1, a kind of low-carbon and low-alloy structural steel without chromium and nickel is characterized in that chemical ingredients (weight %) is: C:0.20～0.25%, and Si:0.40～0.60%, Mn:1.80～2.30%, Mo:0.30～0.50%, W:0.40～0.60%, surplus is Fe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95104296A CN1039246C (en) | 1995-05-03 | 1995-05-03 | Low-carbon and low-alloy structural steel without chromium and nickel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95104296A CN1039246C (en) | 1995-05-03 | 1995-05-03 | Low-carbon and low-alloy structural steel without chromium and nickel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1115790A CN1115790A (en) | 1996-01-31 |
| CN1039246C true CN1039246C (en) | 1998-07-22 |
Family
ID=5075091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95104296A Expired - Fee Related CN1039246C (en) | 1995-05-03 | 1995-05-03 | Low-carbon and low-alloy structural steel without chromium and nickel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1039246C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100422371C (en) * | 2006-05-29 | 2008-10-01 | 宝山钢铁股份有限公司 | Chromic-nickel-free high-strength high ductility structural steel and manufacturing method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5597425A (en) * | 1979-01-19 | 1980-07-24 | Nippon Kokan Kk <Nkk> | Preparation of high-tensile steel with low yield ratio, low carbon and low alloy |
| JPS60155644A (en) * | 1984-01-25 | 1985-08-15 | Nippon Kokan Kk <Nkk> | Steel for high tension steel bolt having superior delayed fracture resistance |
| CN1050909A (en) * | 1990-12-03 | 1991-04-24 | 冶金工业部钢铁研究总院 | Structural low |
-
1995
- 1995-05-03 CN CN95104296A patent/CN1039246C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5597425A (en) * | 1979-01-19 | 1980-07-24 | Nippon Kokan Kk <Nkk> | Preparation of high-tensile steel with low yield ratio, low carbon and low alloy |
| JPS60155644A (en) * | 1984-01-25 | 1985-08-15 | Nippon Kokan Kk <Nkk> | Steel for high tension steel bolt having superior delayed fracture resistance |
| CN1050909A (en) * | 1990-12-03 | 1991-04-24 | 冶金工业部钢铁研究总院 | Structural low |
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| Publication number | Publication date |
|---|---|
| CN1115790A (en) | 1996-01-31 |
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