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Steel plate for high toughness 15CrMoR pressure container

A pressure vessel, high toughness technology, applied in the field of chromium-molybdenum series heat-resistant pressure vessel steel manufacturing, can solve the problems of not meeting special requirements, large temperature difference stress, no reliability, etc., achieve conventional performance and good high temperature tensile performance , Uniform and fine grains, the effect of improving impact toughness

Inactive Publication Date: 2014-04-16
JIGANG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although most of the 15CrMoR heat-resistant steel pressure vessels work at high temperatures, after the pressure vessels and pipelines are manufactured, they will be subjected to a hydraulic test at room temperature or even in extreme climates with a pressure of 1.25 times the design pressure. After that, it has to go through the hydrostatic test and cold start process. Therefore, the steel should have a certain resistance to brittle fracture on the basis of ensuring its basic performance.
In addition, the container made of this steel type has been operated at high temperature for a long time, and there is no reliable measure to prevent excessive cooling during shutdown, resulting in thermal fatigue and large temperature difference stress. Therefore, its toughness reserve should also be considered when designing this steel type. Enhanced resistance to deformation and temperature changes
Conventional 15CrMoR container steel is required to meet the requirements of impact toughness ≥ 31J at 20°C in accordance with the provisions of GB713-2008, which is far from meeting the special requirements of some users, which limits the application of this steel to a certain extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The high-toughness 15CrMoR steel plate for pressure vessels in this example is prepared from the following components by mass percentage: C: 0.18%, Si: 0.23%, Mn: 0.55%, P: 0.016%, S: 0.002%, Cr: 1.03%, Mo: 0.46%, the balance is Fe and unavoidable impurities;

[0020] The production preparation method of the high toughness 15CrMoR pressure vessel steel plate of the present embodiment is as follows:

[0021] 1) Smelting: After the raw material molten iron is pretreated by KR, it is smelted in the top-bottom re-blowing converter, the ladle is blown with argon and then sent to the LF refining furnace for refining, and then vacuum treatment is carried out in the VD furnace for 17 minutes. After the treatment, it is fed Calcium iron wire 2m / t, soft argon blowing for 10 minutes after wire feeding;

[0022] 2) Casting: After the VD furnace breaks the vacuum, pour on the continuous casting machine. During the pouring process, the casting machine adopts fan-shaped electromagnet...

Embodiment 2

[0027] The high-toughness 15CrMoR steel plate for pressure vessels in this example is prepared from the following components in mass percentage: C: 0.17%, Si: 0.25%, Mn: 0.55%, P: 0.012%, S: 0.002%, Cr: 1.03%, Mo: 0.47%, the balance is Fe and unavoidable impurities.

[0028] The production and preparation method of the high-toughness 15CrMoR steel plate for pressure vessels in this example is the same as in Example 1, the difference is that the vacuum holding time of the VD furnace is 15 minutes, the heating time of the billet in the furnace is 4.5 hours, and the furnace temperature is 1180°C.

Embodiment 3

[0030] The high-toughness 15CrMoR steel plate for pressure vessels in this example is prepared from the following components in mass percentage: C: 0.17%, Si: 0.27%, Mn: 0.55%, P: 0.017%, S: 0.001%, Cr: 0.94%, Mo: 0.46%, the balance is Fe and unavoidable impurities.

[0031] The production and preparation method of the high-toughness 15CrMoR pressure vessel steel plate in this example is the same as in Example 1, the difference is that the vacuum holding time of the VD furnace is 15 minutes, the heating time of the continuous casting slab in the heating furnace is 4.5 hours, the temperature of the furnace is 1180 ° C, and the finishing mill The rolling start temperature is 950°C, the rolled finished steel plate size is 40mm, the normalizing temperature is 920°C, the furnace time is 60 minutes, the tempering temperature is 660°C, and the furnace time is 100 minutes.

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Abstract

The invention relates to the manufacturing field of steel for a chrome-molybdenum heat resistant pressure container, in particular to a steel plate for a high toughness 15CrMoR pressure container. The steel plate is prepared by the following components in percentage by mass: 0.14-0.18% of C (Carbon), 0.15-0.40% of Si (Silicon), 0.45-0.70% of Mn (Manganese), no more than 0.020% of P (Phosphorus), no more than 0.005% of S (Sulfur), 0.90-1.10% of Cr (Chromium), 0.45-0.60% of Mo (Molybdenum) and the balance of Fe (Ferrum) and inevitable impurities. The steel plate for the high toughness 15CrMoR pressure container, provided by the invention, has the advantages as follows: (1) as impact toughness of 15CrMoR is high, low temperature impact performance is that transverse impact is not less than 80 J at -40 DEG C and far higher than the nationally specified transverse impact; (2) pure steel quality and low content of harmful elements such as S and the like; (3) as refined grain elements, such as Nb, V, Ti and the like, are not added, cost is greatly saved; and (4) when a requirement on low temperature toughness is satisfied, good conventional properties and good high-temperature tensile properties are obtained.

Description

technical field [0001] The invention relates to the field of manufacturing chromium-molybdenum series heat-resistant pressure vessel steel, in particular to a high-toughness 15CrMoR steel plate for pressure vessels. Background technique [0002] 15CrMoR steel is a kind of medium-temperature pressure vessel steel commonly used in petrochemical equipment. Because it works under high temperature and pressure, its service conditions are harsh, so the material is required to have high thermal strength, good toughness and plasticity, and durability. Corrosion and welding properties. [0003] Although most of the 15CrMoR heat-resistant steel pressure vessels work at high temperatures, after the pressure vessels and pipelines are manufactured, they will be subjected to a hydraulic test at room temperature or even in extreme climates with a pressure of 1.25 times the design pressure. Finally, it has to go through the hydraulic test and cold start process. Therefore, the steel grade ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/22C22C33/04C21D8/02
Inventor 孙卫华邵正伟成小龙孙风晓刘晓东刘金泉郑淑胜朱延山
Owner JIGANG GRP
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