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Smelting method of weathering resistant steel for direct-reading spectrum standard

A direct-reading spectrum and smelting method technology, applied in the field of steelmaking, can solve the problems of difficult effective control of composition segregation, large gap in technical requirements, and dependence on imports, etc., to improve the shape and distribution of inclusions, improve accuracy and uniformity, Guarantees precise control over levels of effect

Inactive Publication Date: 2021-04-30
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The standard steel for direct reading spectrum of weathering steel requires the relative standard deviation SD%≤2% of the ingot to detect the constituent elements. However, due to the relatively high content of phosphorus in weathering steel, its composition segregation is difficult to effectively control. Steel samples basically rely on imports
[0003] In the prior art, the published patent applications CN202010095536.1, CN202010116991.5 and CN201811212263.3 have introduced several components of weathering steel and their preparation methods; however, there is no introduction on the uniformity of components
In the patent application CN201911119928.0, a control method for improving P center segregation of weathering steel is disclosed, which adopts blast furnace + hot metal desulfurization + converter + LF refining + continuous casting + hot continuous rolling process to produce weathering steel, but its undecided Quantitatively characterizes the uniformity index of elements, only a few gold phase comparison diagrams are given qualitatively, and there is a big gap between the technical requirements of the standard steel for direct reading spectroscopy
Among the disclosed technologies for the production of steel for direct reading standard samples, there is no introduction to the production method of weathering steel direct reading standard steel

Method used

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  • Smelting method of weathering resistant steel for direct-reading spectrum standard
  • Smelting method of weathering resistant steel for direct-reading spectrum standard
  • Smelting method of weathering resistant steel for direct-reading spectrum standard

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Embodiment 1-6

[0016] Embodiment 1-6: The smelting method of weathering steel for direct reading spectrum standard adopts the following process.

[0017] (1) The composition and content of the weathering steel for the direct reading spectrum standard are (wt): C 0.05%-0.20%, Si0.15%-1.05%, Mn 0.1%-0.6%, P 0.05%-0.16% , S ≤ 0.006%, Cr 0.2% ~ 1.5%, Ni 0.10% ~ 0.75%, Mg 0.005% ~ 0.008%, the balance is Fe and unavoidable impurities. See Table 1 for the target content of weathering steel components described in each embodiment.

[0018] Table 1: Target content (wt%) of weathering steel components described in each example

[0019]

[0020] In Table 1, the balance of the components is Fe and unavoidable impurities.

[0021] (2) The equipment uses a vacuum induction furnace with a rated capacity of 500kg to smelt weathering steel for direct reading spectrum standard steel, with a rated power of 350kw and an ultimate vacuum of 6.67×10 -2 Pa; The production process includes furnace loading, vac...

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Abstract

The invention discloses a smelting method of weathering resistant steel for direct-reading spectrum standard. The smelting method of the weathering resistant steel for the direct-reading spectrum standard adopts a vacuum induction furnace for smelting, and comprises processes of charging, vacuum heating, degassing, deoxidation, alloying and tapping, and the processes are as follows: (1) charging: charging pure iron, chromium metal and electrolytic nickel into a crucible of the vacuum induction furnace; (2) vacuum heating: vacuumizing, and electrifying for heating until the steel and iron materials in the crucible are melted down; (3) degassing: carrying out high-vacuum degassing for 40-80 minutes under the pressure of less than or equal to 1 Pa; (4) deoxidation and alloying: argon is filled to 35000-40000 Pa, and nickel-magnesium alloy is added for deoxidation and desulfurization; after deoxidation is completed, power is cut off for cooling, and when the temperature reaches 1530-1550 DEG C, carbon powder, electrolytic manganese, ferrophosphorus, industrial silicon and the like are added for alloying; and (5) tapping: after the components of molten steel are detected to be qualified, when the temperature is raised to 20-30 DEG C above liquidus temperature of the weathering resistant steel, electrified tapping is carried out at a constant speed, and an ingot mold is a water-cooled copper ingot mold. According to the smelting method of the weathering resistant steel for the direct-reading spectrum standard, relative standard deviation SD% of cast ingot obtained through the method is smaller than or equal to 2%, and accuracy and uniformity are effectively improved.

Description

technical field [0001] The invention relates to a steelmaking method, in particular to a method for smelting weather-resistant steel for direct-reading spectrum standards. Background technique [0002] Weathering steel is a low-alloy structural steel that is resistant to atmospheric corrosion and is widely used in manufacturing industries such as vehicles, bridges, towers, and containers. Phosphorus, chromium, nickel and other alloying elements in weathering steel form a dense and highly adhesive protective film on the surface of the steel, which can effectively prevent the spread and development of rust in the atmosphere. The standard steel for direct reading spectrum of weathering steel requires the relative standard deviation SD%≤2% of the ingot to detect the constituent elements. However, due to the relatively high content of phosphorus in weathering steel, its composition segregation is difficult to effectively control. Steel samples basically rely on imports. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21C7/00C21C7/06C21C7/064C21C7/10C22C38/02C22C38/04C22C38/40
CPCC21C7/0006C21C7/06C21C7/0645C21C7/10C22C33/04C22C38/002C22C38/02C22C38/04C22C38/40
Inventor 张福利王育飞张灿徐于斌赵培义李瑞杰王博祥齐紫阳
Owner HEBEI IRON AND STEEL
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