Method for controlling hydrogenation chrome molybdenum steel inclusions

A hydrogen-prone chromium-molybdenum and inclusion technology, applied in the field of hydrogen-prone chromium-molybdenum steel inclusion control, can solve the problems of reducing material plasticity, toughness and fatigue limit, anisotropy, cold and hot processing performance deterioration, etc., to achieve desulfurization Efficient and stable, reducing impurities and optimizing the casting process
CN108300835AInactive Publication Date: 2018-07-20WUYANG IRON & STEEL
6 Cites 7 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
WUYANG IRON & STEEL
Publication Date
2018-07-20
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a method for controlling hydrogenation chrome molybdenum steel inclusions. The method comprises the procedures of converter smelting, vacuum carbon deoxidization, LF refining,VD vacuum treatment and slab continuous casting. According to the vacuum carbon deoxidization procedure, vacuum carbon deoxidization treatment is conducted for 7 min, argon is blown in the vacuum carbon deoxidization process at 100-200 L / min and stirring is conducted, and after the vacuum degree reaches 0.5 torr, vacuum is relieved, and a ladle is sampled and hung to an LF for refining. Accordingto the method for controlling the hydrogenation chrome molybdenum steel inclusions, one-time vacuum carbon deoxidization treatment is conducted before LF refining, so that the oxygen content in moltensteel is further reduced; the alkalinity of refining slag is controlled and good fluidity is kept so as to increase the possibility that the inclusions in the molten steel are adsorbed; the soft blowtime after VD is prolonged properly, and inclusion floating is promoted; and the argon is blown in a middle ladle before casting, air in the middle ladle is discharged, and the chance of secondary oxidation when the molten steel enters the middle ladle is reduced. According to the method for controlling the hydrogenation chrome molybdenum steel inclusions, impurities in the hydrogenation chrome molybdenum molten steel are effectively reduced, and thus the mechanical properties of a finished steel plate are improved.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for controlling inclusions in hydrogen-prone chromium-molybdenum steel. Background technique

[0002] Hydrogen chromium molybdenum steel for pressure vessels is a low-carbon low-alloy steel with less alloy elements and excellent comprehensive mechanical properties. Plain steel, mainly used in oil refining and chemical industry, coal gasification and liquefaction, boilers and other industries, for the manufacture of heat exchangers, hydrogen equipment, liquefied gas tanks, liquefied petroleum gas cylinders, equipment and components in contact with hydrogen or hydrogen mixed media . This type of steel has high requirements on the purity of the steel, and impurity elements (P, S, Sb, Sn) and inclusions have a great influence on the mechanical properties and temper embrittlement of hydrogen-prone chromium-molybdenum steel, which seriously hinders the The app...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More