Steel plate for low temperature pressure container and producing method thereof

A technology for pressure vessels and steel plates, applied to steel plates for low-temperature pressure vessels and their production fields, can solve the problems of increased operation difficulty, unfavorable welding performance, increased carbon equivalent, etc., and achieves low cost, moderate strength, and high low temperature toughness. Effect

Inactive Publication Date: 2008-03-19
SHANDONG IRON & STEEL CO LTD
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Problems solved by technology

On the one hand, the existence of Cu element increases the probability of cracks during continuous casting and heating rolling, which increases the dif

Method used

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Examples

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Embodiment Construction

[0020] According to the composition design and production process provided by the present invention, two impact temperature examples of -40°C and -30°C are provided. In addition to what has been explained in this manual, this example adopts continuous casting slab size 270×1600×2800mm, hot charging furnace temperature below 680°C, heating temperature 1160°C, double-stand two-stage controlled rolling, IC cooling intermediate billet, finishing mill The accumulative deformation rate is 64%, the starting rolling temperature is 930-900°C, the final rolling temperature is 870-890°C, the cooling rate is 10-15°C / S, the final cooling temperature is 680-630°C, the heat treatment furnace temperature is 890-900°C, the furnace time 40-60 minutes. The chemical composition of the example is shown in Table 1, and the physical performance test results are shown in Table 2.

[0021] It can be seen from the data in Table 1 and Table 2 that the steels of the two specifications have the character...

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Abstract

The present invention relates to a steel plate used for a low temperature pressure vessel and the production method thereof. The steel plate has the main chemical composition content (wt percent) that C is 0.12-0.19 percent, Si is 0.15-0.45 percent, Mn is 1.2-1.6 percent, Nb is 0.015-0.050 percent, Ti is 0.01-0.03 percent, Ni is 0.10-0.35 percent, Al is 0.015-0.050 percent, and P is 0-0.015 percent; S is 0-0.01 percent, and the residual is Fe and inevitable impurity. The present invention uses a new process technology of hot billet steel furnace loading, intermediate billet water cooling, controlled rolling, controlled cooling accelerating, and normalizing, which is easy to be operated, reduces the dosage of the alloying element to the lowest, in particular, largely reduces the use of the precious metal Ni, the transverse impact power of the low temperature toughness 40 below zero is up to 164 J, transverse impact power of 30 below zero is up to 298 J, and CTOD is Delta 0.20 equal to 0.40 mm in the test condition that the temperature is 40 below zero. The cost of the steel type is relatively lower, the hourly output is high, the intensity is moderate, the plasticity is good, the low temperature toughness is high, the welding performance is extremely fine, and thereby the steel type can be widely applied to low temperature vessels for storing and delivering low temperature liquid in various industries and the petroleum and the chemical industry fields.

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to a steel plate for low-temperature pressure vessels and a production method thereof. Background technique [0002] According to the relevant literature and the latest published patent technology, Chongqing Steel adopts V and Ti microalloying treatment technology. At present, only Shenyang Heavy Machinery Factory has applied for the Chinese patent of "a low temperature resistant weldable fine grain thickness direction steel plate". Application, its application number is 94110049, and the application date is August 2, 1995. The product formula ingredients in this technology include C, Mn, Si, P, S, V, Ti, Cu, Cr, Mo, Ni, Fe. On the one hand, the existence of Cu element increases the probability of cracks during continuous casting and heating rolling, which increases the difficulty of operation. On the other hand, Mo, Cr, and V elements increase the cost and increase the carbon equivalen...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21D9/46C21D1/28C22C33/04C21C7/00C21D8/02B21B37/00
Inventor 刘晓美孙卫华张爱民邵明天马兴云唐立冬高峰马学刚
Owner SHANDONG IRON & STEEL CO LTD
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