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Chromium-molybdenum steel plate for high-alloy American-standard container and production method of chromium-molybdenum steel plate

A production method and steel plate technology, which is applied in the field of metallurgy, can solve the problems of steel ingot stress cracks, cracks, cost increase, etc., and achieve the effects of stable and uniform performance, improved flaw detection pass rate, and good compactness

Inactive Publication Date: 2019-08-20
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high content of Cr and Mo added to the steel type, the uneven heating of the steel ingot during the heating process is likely to cause stress concentration, which in turn causes stress cracks in the steel ingot, resulting in cracks or even fractures during the rolling of the steel plate, resulting in unplanned steel plates, which in turn lead to economic loss, cost increase

Method used

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  • Chromium-molybdenum steel plate for high-alloy American-standard container and production method of chromium-molybdenum steel plate
  • Chromium-molybdenum steel plate for high-alloy American-standard container and production method of chromium-molybdenum steel plate

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Effect test

Embodiment 1

[0019] In this embodiment, the specification of SA387Gr9CL2 steel plate for high-alloy American standard container is 50 mm, and the chemical composition and mass percentage of the steel plate are shown in Table 1.

[0020] The production method of the SA387Gr9CL2 steel plate for the high-alloy American standard container of this embodiment comprises smelting, continuous casting, heating, and rolling operations, and the specific process steps are:

[0021] (1) Continuous casting process: After smelting, the molten steel is continuously cast to obtain steel ingots, and the specification of the steel ingots is 10t;

[0022] (2) Heating process: the steel ingot is heated in a soaking furnace, and the heating atmosphere of the soaking furnace is: the slight positive pressure of the furnace is 15Pa, and the oxygen content of the weak oxidizing atmosphere is 2%; multi-platform gradient heating and heat preservation are adopted, and the soaking pit Open the cover and cool to 500°C to...

Embodiment 2

[0026] In this embodiment, the specification of SA387Gr9CL2 steel plate for high-alloy American standard container is 52 mm, and the chemical composition and mass percentage of the steel plate are shown in Table 1.

[0027] The production method of the SA387Gr9CL2 steel plate for the high-alloy American standard container of this embodiment comprises smelting, continuous casting, heating, and rolling operations, and the specific process steps are:

[0028] (1) Continuous casting process: After smelting, the molten steel is continuously cast to obtain steel ingots, and the specification of the steel ingots is 15t;

[0029] (2) Heating process: the steel ingot is heated in a soaking furnace, and the heating atmosphere of the soaking furnace is: the slight positive pressure of the furnace is 25Pa, and the oxygen content of the weak oxidizing atmosphere is 3%; multi-platform gradient heating and heat preservation are adopted, and the soaking pit Open the cover and cool to 700°C to...

Embodiment 3

[0033] In this embodiment, the specification of SA387Gr9CL2 steel plate for high-alloy American standard container is 54 mm, and the chemical composition and mass percentage of the steel plate are shown in Table 1.

[0034] The production method of the SA387Gr9CL2 steel plate for the high-alloy American standard container of this embodiment comprises smelting, continuous casting, heating, and rolling operations, and the specific process steps are:

[0035] (1) Continuous casting process: After smelting, the molten steel is continuously cast to obtain steel ingots, and the specification of the steel ingots is 17t;

[0036] (2) Heating process: the steel ingot is heated in a soaking furnace, and the heating atmosphere of the soaking furnace is: the slight positive pressure of the furnace is 20Pa, and the oxygen content of the weak oxidizing atmosphere is 2.5%; multi-platform gradient heating and heat preservation are adopted, and the soaking pit Open the cover and cool to 600°C ...

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Abstract

The invention discloses a chromium-molybdenum steel plate for a high-alloy American-standard container and a production method of the chromium-molybdenum steel plate. The steel plate comprises the following chemical components of, in percentage by mass, 0.10-0.14% of C, 0.30-0.70% of Si, 0.35-0.60% of Mn, less than or equal to 0.007% of P, less of or equal to 0.006% of S, 9.00-10.00% of Cr, 0.95-1.10% of Mo, 0.020-0.050% of Alt and the balance Fe and inevitable impurities. The production method comprises smelting, continuous casting, heating and rolling processes. According to the steel plateand the production method, alloy composition is refined, a multi-platform gradient heating and heat preservation process is adopted in the heating process, and the produced steel plate has good compactness and comprehensive mechanical properties, completely meets standards and safety requirements, and is suitable for manufacturing equipment and components such as reactors, heat exchangers, separators, spherical tanks, oil tanks, gas tanks, liquefied gas tanks and the like; and the qualified rate of flaw detection is 97% or above.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a high-alloy chromium-molybdenum steel plate for American standard containers and a production method thereof. Background technique [0002] SA387Gr9CL2 is an American standard ASTM / ASME steel grade, which is widely used in petroleum and chemical industries to make reactors, heat exchangers, separators, spherical tanks, oil and gas tanks, liquefied gas tanks and other equipment and components. Due to the high content of Cr and Mo added to the steel type, the uneven heating of the steel ingot during the heating process is likely to cause stress concentration, which in turn causes stress cracks in the steel ingot, resulting in cracks or even fractures during the rolling of the steel plate, resulting in unplanned steel plates, which in turn lead to economic losses, increased costs. [0003] In view of the problems existing in the heating process of SA387Gr9CL2 steel ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/22C21D8/02
CPCC21D8/0226C22C38/002C22C38/02C22C38/04C22C38/06C22C38/22
Inventor 邓建军李建朝尹卫江李杰龙杰袁锦程吴艳阳牛红星李样兵侯敬超瞿征王甜甜
Owner WUYANG IRON & STEEL
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