Heavy-gauge critical hydrogen 12Cr2MolR steel plate and manufacturing method
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A technology with large thickness and production method, which is applied in the field of metal materials, can solve the problems of difficult elimination of original defects of billets and general flaw detection performance, etc., and achieve the effects of flexible production organization, stable source of raw materials, and environmental friendliness
Inactive Publication Date: 2014-09-17
JIGANG GRP
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[0004] However, the ordinary steel ingot method produces hydrogen-chromium-molybdenum steel extra-thick plates with a thickness greater than 120mm, and the yield is only about 70%. The bonding interface is rough, and the deformation during rolling is not easy to eliminate the original defects of the billet, and the flaw detection performance is average.
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Embodiment 1
[0031] 100mm12Cr2Mo1R large-thickness hydrogen chromium molybdenum steel plate is produced by using 200mm thick common continuous casting slab.
[0032] The melting composition of 12Cr2Mo1R (weight percentage): C=0.11%, Si=0.084%, Mn=0.41%, P=0.008%, S=0.002%, Cr=2.31%, Mo=0.96%, As=0.006%, Sn=0.0043%, Sb=0.0008%, gas content O=0.0020%, N=0.0035%, H=0.0001%, Ceq=0.83%, Pcm=0.31%, the rest is Fe and unavoidable impurities.
[0033] 1) 12Cr2Mo1R is smelted by double slag dephosphorization process, and the continuous casting slabs are immediately hung in a slow cooling pit for slow cooling treatment after cutting, and two 200mm thick continuous casting slabs are selected as raw materials; the two raw materials are heated at a rate of 55°C / h To 880 ℃, keep warm for 10 hours, then hang it to the casting slab slow cooling pit to cool down to room temperature.
[0034] 2) Mill the two raw materials to make them smooth, grind the longitudinal edge of each billet to a width of 60 mm, ...
Embodiment 2
[0045] Utilize 300mm thick ordinary continuous casting slab to produce 200mm12Cr2Mo1R large thickness hydrogen 12Cr2Mo1R steel plate.
[0046] The melting composition of 12Cr2Mo1R (weight percentage): C=0.11%, Si=0.10%, Mn=0.55%, P=0.010%, S=0.0019%, Cr=2.26%, Mo=0.97%, As=0.008%, Sn=0.0046%, Sb=0.0006%, gas content O=0.0019%, N=0.0033%, H=0.0001%, Ceq=0.85%, Pcm=0.32%, the rest is Fe and unavoidable impurities.
[0047] 1) The 12Cr2Mo1R is smelted by the double slag dephosphorization process, and the continuous casting slabs are hoisted into the slow cooling pit for slow cooling treatment immediately after cutting, and two 300mm thick continuous casting slabs are selected as raw materials.
[0048] 2) Raise the temperature of the two raw materials to 880°C at a heating rate of 58°C / h, keep them warm for 10.5 hours, and then hang them to the billet slow cooling pit to cool down to room temperature.
[0049] 3) Mill the two raw materials to make them smooth, grind the longitud...
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Abstract
The invention belongs to the field of metallic materials and specifically relates to a heavy-gauge critical hydrogen 12Cr2MolR steel plate and its manufacturing method. the steel plate provided by the invention is composed of the following components, by weight, 0.08-0.15% of C, Si being less than or equal to 0.10%, 0.30-0.60% of Mn, P being less than or equal to 0.010%, S being less than or equal to 0.010%, 2.0-2.50% of Cr, 0.90-1.10% of Mo, Sb being less than or equal to 0.003%, Sn being less than or equal to 0.010%, As being less than or equal to 0.010%, O being less than or equal to 0.002%, N being less than or equal to 0.004%, H being less than or equal to 0.0003%, and the balance Fe and unavoidable impurities. The invention has the following beneficial effects: limitation of carbon equivalent of steel by a continuous-casting vacuum-welding composite ply-rolling super-thick steel plate technology are broken through; bottle-necks of poor welding property and rigorous welding conditions of a vacuum electron beam welding technology of critical hydrogen chromium-molybdenum steel are overcome; without the condition of traditional weld preheating, the heavy-gauge blank preparation technology by critical hydrogen chromium-molybdenum steel double-blank and multi-blank is developed; a heavy-gauge critical hydrogen chromium-molybdenum steel plate of 80-200mm thickness is developed; by the manufacturing method for production of the critical hydrogen chromium-molybdenum steel plate, power consumption is about 20kWh / t, water consumption is about 3m<3> / t, yield of produced steel plates is about 88%, and no dust is generated.
Description
technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a large-thickness hydrogen-facing 12Cr2Mo1R steel plate and a manufacturing method thereof. Background technique [0002] Refining and chemical industry equipment (including hydrogenation reactors, four-in-one continuous reforming reactors, screw-type heat exchangers, hot high-pressure separators, etc.) The representative hydrogen chromium molybdenum steel is manufactured. This material requires high temperature resistance, high pressure resistance, hydrogen induced crack resistance, and temper embrittlement resistance. The requirements are also getting higher and higher. According to rough statistics, the 80-200mm thick hydrogen chromium molybdenum steel plate occupies more than 80% of the market share. [0003] The thickness of continuous casting slabs produced by major steel mills is usually about 300mm. Due to the limitation of compression ratio and heat treatment ...
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