CN101597714A - A kind of high-strength steel strip - Google Patents
A kind of high-strength steel strip Download PDFInfo
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- CN101597714A CN101597714A CNA200910074587XA CN200910074587A CN101597714A CN 101597714 A CN101597714 A CN 101597714A CN A200910074587X A CNA200910074587X A CN A200910074587XA CN 200910074587 A CN200910074587 A CN 200910074587A CN 101597714 A CN101597714 A CN 101597714A
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Abstract
A kind of high-strength steel strip belongs to steel material technical field, is used for solving welding carbon equivalent height, unit elongation and cold-bending property problem on the low side.Special feature is: the chemical composition content weight percent is as follows: C:0.06～0.20%, Si:0.10≤0.40%, Mn:0.30～1.00%, V:0.001～0.030%, P≤0.040%, S≤0.040%, surplus Fe.High-strength steel strip of the present invention rationally controlling on the basis of constituent contents such as carbon, silicon, sulphur, phosphorus, reduces manganese content, adds the alloying element vanadium of trace, utilizes the effect of the precipitation strength of vanadium, reaches the purpose of crystal grain thinning.High-strength steel strip according to this proportioning is smelted when satisfying intensity, unit elongation and cold-bending property requirement, effectively reduces the welding carbon equivalent, its welding technological properties and unit elongation are improved, simultaneously can reduce the alloy consumptive material, help reducing production costs, improve the business economic benefit.
Description
Technical field
Type of the present invention relates to a kind of metallic substance, and particularly yield strength is greater than 345N/mm
2Steel band, belong to steel material technical field.
Background technology
Yield strength 345～460N/mm
2Steel band, be a kind of purposes steel very widely, it requires to have higher intensity, plasticity, welding property, cold and hot working performance, be mainly used in the manufacturing boats and ships, boiler, pressurized vessel, petroleum storage tank, bridge, power station equipment, handling machinery and other bear the welding structural element than high-load.At present, domestic and international many iron and steel enterprises are in order to reach product performance requriements required and the related standards regulation, the product chemical Composition Control scope of recommending according to related standards in smelting process normally realizes by processing parameters such as heating in the control course of hot rolling, rolling, coolings again.In the current standards to yield strength greater than 345～460N/mm
2High-strength steel strip in the requirement of manganese content be 1.00～1.60%, though can meet the demands, there is following problem in high-intensity band steel according to afore mentioned rules is smelted on intensity: 1. it is high that higher manganese content consumes the smelting process alloy material, increase production cost, cause resource consumption big; 2. because making, the increase of manganese content welds the carbon equivalent raising, thereby the processing performance of influence welding; 3. the unit elongation of material and cold-bending property are on the low side.
Summary of the invention
The present invention is intended to solve the defective of prior art and a kind of high-strength steel strip that has good welds performance and unit elongation when intensity is up to standard is provided
The alleged problem of the present invention is that following technical scheme solves:
A kind of high-strength steel strip, its special feature is: the chemical composition content weight percent is as follows: C:0.06～0.20%, Si:0.10≤0.40%, Mn:0.30～1.00%, V:0.001～0.030%, P≤0.040%, S≤0.040%, surplus Fe.
Above-mentioned high-strength steel strip, the chemical composition content weight percent is as follows: C:0.10～0.15%, Si:0.15≤0.30%, Mn:0.50～0.80%, V:0.005～0.020%, P≤0.040%, S≤0.040%, surplus Fe.
Yield strength provided by the present invention is 345～460N/mm
2High-strength steel strip, improve at existing like product welding carbon equivalent height, unit elongation and cold-bending property problem on the low side, described high-strength steel strip is rationally being controlled on the basis of constituent contents such as carbon, silicon, sulphur, phosphorus, reduce manganese content, add the alloying element vanadium of trace, utilize the effect of the precipitation strength of vanadium, reach the purpose of crystal grain thinning.High-strength steel strip according to this proportioning smelting, when satisfying intensity, unit elongation and cold-bending property requirement, effectively reduce the welding carbon equivalent, its welding technological properties and unit elongation are improved, simultaneously because the reduction of manganese content, can reduce the alloy consumptive material, help reducing production costs, improve economic benefit of enterprises.
Embodiment
Yield strength 345～460N/mm provided by the present invention
2The chemical ingredients proportioning of steel band breaks through the conventional chemical ingredients scope of smelting of like product, and reduction manganese content by a relatively large margin obviously reduces the welding carbon equivalent, improves material welding performance.Added trace vanadium for the mechanical property that guarantees steel band in composition simultaneously, adding V is the important improvement of chemical ingredients prescription of the present invention.V is an element most economical in the micro alloying element, and V can suppress the disadvantageous effect of nitrogen, and can also make the precipitin reaction optimizing together with V.The carbide of the formation of vanadium in steel can gently dissolve in the austenite at high temperature, exists with the fine particle state usually, and they generally are enough to suppress the mobile and grain growth of crystal boundary in the steel, and therefore, containing vanadium steel mostly is compact grained.No matter contain a certain amount of vanadium in the steel, be annealing, normalizing or quality adjustment condition, all can improve intensity, particularly yield-point and the yield tensile ratio of steel, can also improve the plasticity and the toughness of steel.In addition, vanadium can also improve the weldability of soft steel significantly, and this mainly is the as-cast structure of vanadium energy refinement welding metal and the superheated susceptivity that reduces the heat affected zone, prevents that in the heat affected zone grow up and alligatoring in the excessive grain ground near the metal that melts line.
Several embodiment below are provided:
Embodiment 1: high-strength steel strip chemical composition content weight percent is as follows: C:0.11%, Si:0.18%, Mn:0.36%, P:0.023%, S:0.015%, V:0.018%, yield strength: 365N/mm
2, tensile strength: 490N/mm
2, unit elongation 〉=34.0%, manganese, vanadium make carbon equivalent increase by 0.020.
Embodiment 2: high-strength steel strip chemical composition content weight percent is as follows: C:0.10%, Si:0.20%, Mn:0.50%, P:0.037%, S:0.031%, V:0.014%, yield strength: 395N/mm
2, tensile strength: 500N/mm
2, unit elongation 〉=36.0%, manganese, vanadium make carbon equivalent increase by 0.026.
Comparative Examples: the Q345 trade mark among the GB/T1591-94, Mn 1.3%, yield strength 〉=345N/mm
2, tensile strength 470～630N/mm
2, unit elongation 〉=23%, manganese make carbon equivalent increase by 0.217.
Can find out that by the foregoing description and Comparative Examples high-strength steel strip of the present invention effect aspect reduction carbon equivalent and raising unit elongation is obvious, and can consume by reduction manganese alloy by a relatively large margin.
Embodiment 3: high-strength steel strip chemical composition content weight percent is as follows: C:0.15%, Si:0.15%, Mn:0.40%, V:0.020%, P:0.025%, S:0.026%, surplus Fe.Yield strength: 360N/mm
2, tensile strength: 450N/mm
2, unit elongation 〉=34.5%.
Embodiment 4: high-strength steel strip chemical composition content weight percent is as follows: C:0.10%, Si:0.30%, Mn:0.80%, V:0.005%, P:0.022%, S:0.021%, surplus Fe.Yield strength: 370N/mm
2, tensile strength: 490N/mm
2, unit elongation 〉=34.5%.
Embodiment 5: high-strength steel strip chemical composition content weight percent is as follows: C:0.06%, Si:0.40%, Mn:1.00%, V:0.001%, P:0.027%, S:0.030%, surplus Fe.Yield strength: 370N/mm
2, tensile strength: 440N/mm
2, unit elongation 〉=34.5%.
Embodiment 6: high-strength steel strip chemical composition content weight percent is as follows: C:0.20%, Si:0.10%, Mn:0.30%, V:0.030%, P:0.013%, S:0.022%, surplus Fe.Yield strength: 395N/mm
2, tensile strength: 515N/mm
2, unit elongation 〉=33%.
Embodiment 7: high-strength steel strip chemical composition content weight percent is as follows: C:0.13%Si:0.27%, Mn:0.62%, P:0.035%, S:.021%, V:0.018%, yield strength: 420N/mm
2, tensile strength: 515N/mm
2, unit elongation 〉=30.5%;
Low high-strength steel strip of the present invention is smelted according to above-mentioned chemical ingredients proportioning, through ironmaking, steel-making, continuous casting, technology such as rolling, produces high-strength steel strip.During hot rolling, the steel band coiling temperature is controlled at 550～650 ℃.
Claims (2)
1. high-strength steel strip, it is characterized in that: the chemical composition content weight percent is as follows: C:0.06～0.20%, Si:0.10≤0.40%, Mn:0.30～1.00%, V:0.001～0.030%, P≤0.040%, S≤0.040%, surplus Fe.
2. high-strength steel strip according to claim 1 is characterized in that, the chemical composition content weight percent is as follows: C:0.10～0.15%, Si:0.15≤0.30%, Mn:0.40～0.80%, V:0.005～0.020%, P≤0.040%, S≤0.040%, surplus Fe.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA200910074587XA CN101597714A (en) | 2009-07-02 | 2009-07-02 | A kind of high-strength steel strip |
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| CNA200910074587XA CN101597714A (en) | 2009-07-02 | 2009-07-02 | A kind of high-strength steel strip |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104694820A (en) * | 2015-03-12 | 2015-06-10 | 山东钢铁股份有限公司 | Low-alloy steel hot rolled steel strip with tensile strength of 500 MPa above and preparation method thereof |
| CN105385947A (en) * | 2015-11-26 | 2016-03-09 | 河北钢铁股份有限公司承德分公司 | Steel for vanadium-microalloying 600 MPa high-strength packing belt and production method |
-
2009
- 2009-07-02 CN CNA200910074587XA patent/CN101597714A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104694820A (en) * | 2015-03-12 | 2015-06-10 | 山东钢铁股份有限公司 | Low-alloy steel hot rolled steel strip with tensile strength of 500 MPa above and preparation method thereof |
| CN105385947A (en) * | 2015-11-26 | 2016-03-09 | 河北钢铁股份有限公司承德分公司 | Steel for vanadium-microalloying 600 MPa high-strength packing belt and production method |
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Free format text: FORMER OWNER: HEBEI IRON + STEEL GROUP CO. LTD Owner name: HEBEI IRON + STEEL CO.,LTD. Free format text: FORMER OWNER: CHENGDE XINXIN VANADIUM AND TITANIUM CO.,LTD. Effective date: 20100331 |
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Free format text: CORRECT: ADDRESS; FROM: 067002 ROOM 418, TOWER A, FINANCIAL PLAZA, CHENGDE STEEL GROUP COMPANY LTD., SHUANGLUAN DISTRICT, CHENGDE CITY, HEBEI PROVINCE TO: 050000 NO.40, YUHUA WEST ROAD, SHIJIAZHUANG CITY, HEBEI PROVINCE |
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Effective date of registration: 20100331 Address after: Yuhua city of Shijiazhuang province Hebei 050000 West Road No. 40 Applicant after: Hebei Iron & Steel Co., Ltd. Address before: 067002 Chengde City, Hebei province shuangluanou Bearing Steel Company Financial Plaza A block, room 418 Applicant before: Xinxin Vanadium Titanium Co., Ltd., Chengde City Co-applicant before: Hebei Iron & Steel Group Co., Ltd. |
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Open date: 20091209 |