Cr-Mo ASTM A387 Gr22CL2 pressure vessel steel and production method thereof

A technology of a pressure vessel and a production method, which is applied in the field of wide and thick steel plate production, can solve the problems of aggravating the segregation and segregation of steel ingots, affecting the center feeding effect of the steel ingot body, and being difficult to meet the demand of product delivery time, and achieving high cooling strength. , the effect of shortening the cooling rate solidification time, solidification time and demolding time

CN103710626AInactive Publication Date: 2014-04-09NANYANG HANYE SPECIAL STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2014-04-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a limit-thickness Cr-Mo ASTM A387 Gr22CL2 pressure vessel steel and a production method thereof. The Cr-Mo ASTM A387 Gr22CL2 pressure vessel steel comprises the following chemical components in percentage by mass: 0.08-0.16 wt% of C, 0.20-0.50 wt% of Si, 0.30-0.60 wt% of Mn, at most 0.015 wt% of P, at most 0.005 wt% of S, 0.020-0.060 wt% of Als, 2.0-2.5 wt% of Cr, 0.9-1.1 wt% of Mo and the balance of Fe and residual element. The production method comprises the following steps: pretreatment of high-quality molten iron and KR molten iron, 120t top / bottom blown converter, argon blowing by Ar station, LF (ladle furnace) refining, VD (vacuum degasser) vacuum degassing, water-cooled die casting, dead soaking pit heating, 3800mm rolling mill, ACC laminar cooling, straightening, cooling in pile, heat treatment, finishing, outer inspection, flaw detection and warehousing. The steel plate is cast by a 48t water-cooled ingot die, so the cooling and solidifying time is shortened by 1 / 3 as compared with the conventional foundry ingot die, the defect of severe loosening or segregation at the center of the steel ingot is reduced or avoided, and the internal quality of the steel plate is improved.
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Description

technical field

[0001] The invention belongs to the technical field of production of wide and thick steel plates, and in particular relates to a Cr-Mo ASTM A387 Gr22CL2 pressure vessel steel with a thickness of 120-150 mm and a production method thereof. Background technique

[0002] ASTM A387 Gr22CL2 belongs to the pressure vessel steel in American Standard ASTM A387 / A387M-06a. It is widely used in petroleum, chemical industry, nuclear power plant, boiler and other industries, and is used to make reactors, heat exchangers, boiler drums, nuclear reactor pressure shells, and hydropower plants. High-pressure water pipes, turbine volute and other equipment components. It is required to have good mechanical properties, good process performance, good corrosion resistance and oxidation resistance.

[0003] At present, traditional production adopts mold casting and pouring. Patent CN102080187A discloses a method for producing 12Cr2Mo1R container steel using 33t flat ingots. Howeve...

Examples

Embodiment 1

[0023] An ASTM A387 Gr22CL2 pressure vessel steel with a limit thickness of Cr-Mo, comprising the following mass percentage components (unit, wt%): C: 0.10, Si: 0.30, Mn: 0.50, P: 0.010, S: 0.002, Als: 0.029 , Cr: 2.2, Mo: 0.98, others are Fe and residual elements.

Embodiment 2

[0025] An ASTM A387 Gr22CL2 pressure vessel steel with a limit thickness of Cr-Mo, comprising the following mass percentage components (unit, wt%): C: 0.09, Si: 0.32, Mn: 0.45, P: 0.011, S: 0.003, Als: 0.025 , Cr: 2.1, Mo: 1.0, others are Fe and residual elements.

[0026] The aforementioned limit thickness Cr-Mo is ASTM A387 Gr22CL2 pressure vessel steel, and the thickness of the steel plate is 120-150 mm.

[0027] The chemical composition and mechanical properties are implemented in accordance with ASTM A387 / A387M-06a, as shown in the table.

[0028]

[0029] The test results of mechanical properties of ASTM A387 Gr22CL2 steel plate are shown in the table.

[0030]

[0031] *H represents the thickness of the steel plate, 1 / 4H or 1 / 2H is the performance of sampling and testing at 1 / 4 or / 1 / 2 of the thickness direction of the steel plate.

[0032] In terms of performance testing, the average yield strength is 479MPa, a surplus of 169Mpa compared with the standard, the...