CN103993241A - Hot-rolled flat plate for composite acid-resistant pipeline steel base and production method thereof - Google Patents
Hot-rolled flat plate for composite acid-resistant pipeline steel base and production method thereof Download PDFInfo
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- CN103993241A CN103993241A CN201410240436.8A CN201410240436A CN103993241A CN 103993241 A CN103993241 A CN 103993241A CN 201410240436 A CN201410240436 A CN 201410240436A CN 103993241 A CN103993241 A CN 103993241A
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Abstract
The invention discloses a hot-rolled flat plate for a composite acid-resistant pipeline steel base and a production method thereof, and belongs to the technical field of composite pipeline steel. The hot-rolled flat plate for the base comprises the following components by weight percent: 0.02-0.05% of C, 0.10-0.40% of Si, 1.10-1.40% of Mn, no more than 0.015% of P, no more than 0.0015% of S, 0.03-0.07% of Nb, 0.02-0.07% of V, 0.010-0.030% of Ti, 0.10-0.30% of Ni, 0.10-0.30% of Cr, 0.15-0.30% of Cu, 0.010-0.050% of Alt, no more than 0.006% of N, no more than 0.00015% of H, no more than 0.004% of Ca, no less than 2.0% of Ca/s, and the balance of Fe and inevitable impurities. The production process comprises the following steps: preparing blast furnace molten iron; pre-desulphurizing molten iron; smelting by virtue of a converter; refining by virtue of a ladle furnace and ruhrstahl heraeus (LF+RH); continuously casting a slab; heating the slab; rolling by virtue of a 4300 rolling mill; cooling in a heap, cracking off, inspecting, warehousing, and dispatching. The hot-rolled flat plate for the composite acid-resistant pipeline steel base has the advantages that the center segregation low-power rate can be up to 0.5 level of the class C, the base tissue is refined by a reasonable rolling process, and advantages are created for overall performance of the hot-rolled composite material.
Description
Technical field
The invention belongs to compound pipe steel technical field, particularly relate to a kind of compound antiacid pipe line steel base-material hot rolled slab and production method.
Background technology
Compound pipe steel hot-rolling flat plate is made up of two portions, the one, base material (or claim base-material) steel plate, according to thickness generally taking pipe line steel as base material, the 2nd, multiple layer, is generally expensive stainless steel, titanium alloy, non-corrosive metal etc.Compound pipe steel be taking pipe line steel as base material, the multiple material such as the coated upper stainless steel of single or double, the energy-efficient material of bimetal forming through special processing process.
Compound pipe steel effectively combines mechanical property and the performance of technical process of corrosion-resistant and high specific tenacity good plied timber and steel, both given its special use function, improve the over-all properties of material, save again precious metal, reduce material cost, make after steel pipe, internal layer is the corrosion resistant materials such as stainless steel, for delivery of high sulfuric acid medium, slurry, high-temperature gas etc., outer layer metal is pipe line steel, can bear certain transfer pressure, improve pipeline operation efficiency.
Compound pipe Plate Production method mainly contains explosion method, hot rolling method etc. at present.Explosion method is that the moment impact ripple producing while utilizing explosive charge is realized welding, the inserted combination of interface indentation.The compound mechanism of hot rolling is atomic diffusion weldering, is one metallurgical binding completely.The pipe line steel composition board that adopts hot rolling method to produce, there is adaptability widely, can make that intensity differs greatly, coefficient of expansion difference, the mutual exclusive two kinds of metal composite of performance be integral, make metal in the interatomic metallurgical binding of solid-state lower formation, and do not change in itself the chemical composition of former component materials.Its product combination rate and bonding strength are better than the product that other solid-state bond method obtains.
Summary of the invention
The object of the present invention is to provide a kind of compound antiacid pipe line steel base-material hot rolled slab and production method, this base-material steel plate is for carrying out following process with the plied timber such as stainless steel, titanium alloy, high temperature alloy, mainly realize metallurgy by vacuum assembly, hot rolling etc. compound, this base-material has good internal soundness and strict size and surface requirements with hot rolled slab.Hot rolled slab thickness 50-200mm for compound antiacid pipe line steel base-material, in order to ensure that internal soundness is good, following several measures are taked in process of production: 1) adopt Clean Steel smelting technology, strictly control easily segregation element content and the lower molten steel overheat such as C, P, S, Mn; 2) tackle key problems by Continuous Casting Soft Reduction Technology, the grading of center segregation low power reaches 0.5 grade of C class; 3) by rational rolling technology, make base-material structure refinement, for ensureing that subsequent hot rolled composite material combination property creates favorable conditions.
Base-material of the present invention with the composition (by weight percentage) of hot rolled slab is:
C:0.02～0.05%, Si:0.10～0.40%, Mn:1.10～1.40%, P :≤0.015%, S :≤0.0015%, Nb:0.03～0.07%, V:0.02～0.07%, Ti:0.010～0.030%, Ni:0.10～0.30%, Cr:0.10～0.30%, Cu:0.15～0.30%, Alt:0.010～0.050%, N :≤0.006%, H :≤0.00015%, Ca :≤0.004%, Ca/s >=2.0, surplus is Fe and inevitable impurity.
The production technique of steel plate of the present invention comprises: blast-melted → molten iron pre-desulfurization → converter smelting → LF+RH refining → sheet billet continuous casting → heating of plate blank → 4300 mill milling → cooling in heap → fire cuts → checks → and puts in storage, shipping.The technical parameter of controlling in technique is as follows:
(1) adopt Clean Steel smelting technology, strictly control the easily segregation element content such as C, P, S, Mn
Unfavorable to resistance against hydrogen cracking due to C, S element, require low C, S content, its mass percent is substantially lower than 0.05%, 0.001%, and in actual production, C content is pressed 0.030-0.050% scope control, and S content is pressed 0.0005-0.0010% scope control; P, Mn belong to easy segregation element, line of segragation easily becomes hydrogen induced cracking (HIC) source, therefore require Composition Control stable, composition fluctuation is little, in actual production process, P element quality percentage composition is less than 0.010%, Mn element quality percentage composition is less than 1.40%, and in actual production, P content is pressed 0.006-0.010% scope control, and Mn content is pressed 1.10-1.30% scope control.
(2) tackle key problems by Continuous Casting Soft Reduction Technology, the grading of center segregation low power reaches 0.5 grade of C class
Adopt sheet billet continuous casting automatization to water steel, by optimization and the application of Continuous Casting Soft Reduction Technology, hinder the Molten Steel Flow containing enrichment segregation element by near the pressure that applies 1200-1800kN continuous casting billet solidifying end with the draught that produces 5-7mm, compensate continuously cast bloom core simultaneously and solidify caused volumetric shrinkage, avoid core to produce negative pressure because of solidification shrinkage, thereby effectively alleviate center segregation of continuous cast slab and center porosity, the grading of center segregation of casting blank low power reaches C class 0.5.
(3) by rational rolling technology, make base-material steel plate structure refinement, for ensureing that subsequent hot rolled composite material combination property creates favorable conditions
Pack blank into bar plate heating stove heating, Heating temperature 1160-1220 DEG C, heat-up time 200-250min; Steel billet enters 4300mm mill milling after coming out of the stove, torque setting value 3200KNm, single pass draft 10～30%, imposes aximal deformation value by the operation of rolling, make the abundant refinement of operation of rolling austenite crystal and homogenizing, thereby create favorable conditions for improving subsequent hot rolled composite material combination property.Roughing start rolling temperature is controlled at 1000～1100 DEG C, and intermediate blank treats that temperature thickness is that finished product thickness increases 20-40mm; Finish rolling start rolling temperature is controlled at 900～930 DEG C; Finishing temperature is controlled at 850-900 DEG C.
The invention has the advantages that, the grading of center segregation low power reaches 0.5 grade of C class, by rational rolling technology, makes base-material structure refinement, for hot rolling composite material combination property creates favorable conditions.
Brief description of the drawings
Fig. 1 is continuously cast bloom macrostructure.
Embodiment
Embodiment 1
Compound antiacid pipe line steel base-material steel plate design mix is by weight percentage: C0.035%, Mn1.35%, Si0.28%, Cr0.20%, Nb0.06%, V0.048%, Cu0.23%, Ni0.023%, S0.002%, Alt0.035%, P0.0053%, all the other are Fe and inevitable impurity.Base-material steel plate specification is: 98 × 1370 × 2100mm (thickness × width × length).
TMCP technique comprises heating, roughing, finish rolling, is specially:
(1) become 237mm heavy slab by according to chemical composition designing the molten steel casting of having smelted; Pack blank into bar plate heating stove heating, 1180 DEG C of Heating temperatures, heat-up time 230min; Then come out of the stove and be rolled;
(2) roughing start rolling temperature is controlled at 1070 DEG C, and single pass draft is 10～30%; Intermediate blank is treated temperature thickness 135mm; Finish rolling start rolling temperature is controlled at 920 DEG C; Finishing temperature is controlled at 890 DEG C.
The compound antiacid pipe line steel base-material surface of steel plate roughness of producing is not more than 4mm/1m, width and length variation [0 ,+8] mm.
Embodiment 2
Compound antiacid pipe line steel base-material steel plate design mix is by weight percentage: C0.030%, Mn1.35%, Si0.30%, Cr0.20%, Nb0.054%, V0.048%, Cu0.25%, Ni0.024%, S0.002%, Alt0.037%, P0.0067%, all the other are Fe and inevitable impurity.Base-material steel plate specification is: 154 × 1970 × 2100mm (thickness × width × length).
TMCP technique comprises heating, roughing, finish rolling, is specially:
(1) become 237mm heavy slab by according to chemical composition designing the molten steel casting of having smelted; Pack blank into bar plate heating stove heating, 1180 DEG C of Heating temperatures, heat-up time 230min; Then come out of the stove and be rolled;
(2) roughing start rolling temperature is controlled at 1030 DEG C, and single pass draft is 10～30%; Intermediate blank is treated temperature thickness 175mm; Finish rolling start rolling temperature is controlled at 915 DEG C; Finishing temperature is controlled at 860 DEG C.
The compound antiacid pipe line steel base-material surface of steel plate roughness of producing is not more than 4mm/1m, width and length variation [0 ,+8] mm.
Claims (2)
1. a compound antiacid pipe line steel base-material hot rolled slab, is characterized in that, this base-material by the composition weight percentage of hot rolled slab is:
C:0.02～0.05%, Si:0.10～0.40%, Mn:1.10～1.40%, P :≤0.015%, S :≤0.0015%, Nb:0.03～0.07%, V:0.02～0.07%, Ti:0.010～0.030%, Ni:0.10～0.30%, Cr:0.10～0.30%, Cu:0.15～0.30%, Alt:0.010～0.050%, N :≤0.006%, H :≤0.00015%, Ca :≤0.004%, Ca/s >=2.0, surplus is Fe and inevitable impurity.
2. a production method for hot rolled slab for compound antiacid pipe line steel base-material claimed in claim 1, technique comprises: blast-melted → molten iron pre-desulfurization → converter smelting → LF+RH refining → sheet billet continuous casting → heating of plate blank → 4300 mill milling → cooling in heap → fire cuts → checks → puts in storage, shipping; It is characterized in that, the technical parameter of controlling in technique is as follows:
(1) adopt Clean Steel smelting technology, strict C, P, the easy segregation element content of S, Mn controlled, C content is pressed 0.030-0.050% scope control, S content is pressed 0.0005-0.0010% scope control, P content is pressed 0.006-0.010% scope control, and Mn content is pressed 1.10-1.30% scope control;
(2) by applying the pressure of 1200-1800kN with the draught of generation 5-7mm near continuous casting billet solidifying end, the grading of center segregation of casting blank low power reaches C class 0.5;
(3) blank is packed into bar plate heating stove heating, Heating temperature 1160-1220 DEG C, heat-up time 200-250min; Steel billet enters 4300mm mill milling after coming out of the stove, torque setting value 3200KNm, single pass draft 10～30%, makes operation of rolling Austenite Grain Refinement and homogenizing, roughing start rolling temperature is controlled at 1000～1100 DEG C, and intermediate blank treats that temperature thickness is that finished product thickness increases 20-40mm; Finish rolling start rolling temperature is controlled at 900～930 DEG C; Finishing temperature is controlled at 850-900 DEG C.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104805372A (en) * | 2015-04-22 | 2015-07-29 | 苏州劲元油压机械有限公司 | Manufacture technology of high-temperature resistant check valve |
| CN104805379A (en) * | 2015-04-22 | 2015-07-29 | 苏州劲元油压机械有限公司 | Casting process for overflow valve with strong acid corrosion resistance and strong alkali corrosion resistance |
| CN113617851A (en) * | 2021-06-23 | 2021-11-09 | 武汉钢铁有限公司 | Online feedback control method and device for short-process production line and electronic equipment |
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| JPH09263831A (en) * | 1996-01-22 | 1997-10-07 | Nippon Steel Corp | Production of extra thick high strength bent pipe excellent in toughness at low temperature |
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| CN101864544A (en) * | 2009-04-16 | 2010-10-20 | 株式会社神户制钢所 | The exhaust phase of acid-resistant steel material and burning, burning facility is low temperature member associated |
| CN102277539A (en) * | 2011-08-01 | 2011-12-14 | 南京钢铁股份有限公司 | High-strength steel with low yield ratio, high plasticity and ultrafine grain and preparation method thereof |
| CN103725983A (en) * | 2013-12-26 | 2014-04-16 | 秦皇岛首秦金属材料有限公司 | Hot-rolled flat plate for X65 heat-stewed bend and production method of hot-rolled flat plate |
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| JPH09263831A (en) * | 1996-01-22 | 1997-10-07 | Nippon Steel Corp | Production of extra thick high strength bent pipe excellent in toughness at low temperature |
| CN101864544A (en) * | 2009-04-16 | 2010-10-20 | 株式会社神户制钢所 | The exhaust phase of acid-resistant steel material and burning, burning facility is low temperature member associated |
| CN101705439A (en) * | 2009-12-18 | 2010-05-12 | 江苏省沙钢钢铁研究院有限公司 | Low-temperature high-toughness F460 grade super strength steel plate for building ship and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104805372A (en) * | 2015-04-22 | 2015-07-29 | 苏州劲元油压机械有限公司 | Manufacture technology of high-temperature resistant check valve |
| CN104805379A (en) * | 2015-04-22 | 2015-07-29 | 苏州劲元油压机械有限公司 | Casting process for overflow valve with strong acid corrosion resistance and strong alkali corrosion resistance |
| CN113617851A (en) * | 2021-06-23 | 2021-11-09 | 武汉钢铁有限公司 | Online feedback control method and device for short-process production line and electronic equipment |
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Application publication date: 20140820 |