Manufacturing method of steel ingot for gas cylinder

A manufacturing method and technology of steel for gas cylinders, which is applied in the field of steel ingot manufacturing, can solve the problems of large dispersion of material strength and toughness, reduce the safety of gas cylinders, reduce toughness and plasticity, etc., and achieve the reduction of uneven segregation of components, element composition And inclusions are easy to control and the effect of reducing the number

Active Publication Date: 2014-02-05
中船双瑞(洛阳)特种装备股份有限公司
View PDF5 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the working pressure increases, the original gas cylinder steel cannot be used due to insufficient strength, and the increase in strength means the decrease in toughness and plasticity, and at the same time reduces the safety of gas cylinders, so the steel for gas cylinders with excellent strength and toughness can be obtained a

Method used

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
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Manufacturing method of steel ingot for gas cylinder
  • Manufacturing method of steel ingot for gas cylinder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] The present invention can be explained in more detail with reference to the following examples; however, the present invention is not limited to these examples.

[0023] A method for manufacturing a steel ingot for a gas cylinder, the specific steps of the method are as follows:

[0024] (1) Raw material: blast furnace hot metal with C content ≥ 4wt% and temperature ≥ 1200°C; when P content in blast furnace hot metal > 0.015wt%, slag with basicity R ≥ 2.5 should be added to blast furnace hot metal Pre-removal of P until the P content in the blast furnace molten iron is ≤0.015wt%;

[0025] (2) Converter smelting: Add the blast furnace molten iron obtained in step (1) with a C content of ≥4wt%, a P content of ≤0.015wt%, and a temperature of ≥1200°C into the converter, and then blow in oxygen for smelting to obtain In molten steel, oxygen reacts with C, Si, Mn, etc. to release heat, increase the temperature of molten steel, and reduce the content of C, Si, and Mn in molte...

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

PUM

No PUM Login to view more

Abstract

The invention belongs to the technical field of manufacturing of steel ingots and discloses a manufacturing method of a steel ingot for a gas cylinder. The manufacturing method of the steel ingot for the gas cylinder comprises the following steps of: raw material purporting, converter smelting, alloy addition, LF (Low Frequency) steel ladle refining, vacuum degreasing treatment, casting as well as electroslag re-melting, wherein the raw material contains not less than 4wt% of C, not more than 0.015wt% of P and blast furnace molten iron with a temperature being not lower than 1200 DEG C; in a converter smelting stage, content of P is lowered by P-removing pretreatment; the LF steel ladle refining adopts an aluminum-free deoxidation process; after the electroslag re-melting and the secondary refining are carried out onto the steel ingot obtained by primary refining and casting so that S and impurities in the steel are lowered. According to the manufacturing method disclosed by the invention, the quantity of harmful elements and impurities in the steel ingot are controlled by twice refining, so that a purpose of controlling components and structure of the steel ingot is reached, the steel ingot for the gas cylinder with excellent strength and toughness is finally obtained, and therefore, working pressure and safety of the steel ingot for the gas cylinder are improved.

Description

technical field [0001] The invention belongs to the technical field of manufacturing steel ingots, and in particular relates to a method for manufacturing steel ingots for gas cylinders. Background technique [0002] Domestic gas cylinder production started in the 1960s, with 35 steel and 45 steel; DZ40 steel was generally used in the 1970s; by the early 1980s, steel pipes for manganese steel gas cylinders had been mass-produced, and the representative steel grades were 40Mn2, 42Mn2, 40Mn2V etc., a small amount of 30CrMoA, 35CrMoA, 30CrMnSiA and other steel pipes are used to manufacture gas cylinders. From the mid-1980s to the mid-1990s, with the establishment and revision of national gas cylinder standards and the expansion of the scope of use of gas cylinders, the C content in manganese steel gas cylinders was lowered twice in order to improve low-temperature impact toughness and integrate with international standards as soon as possible. , and finally dropped from ≤0.44%...

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

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C21C7/00C22B9/18B22D7/00C22C33/04
CPCY02P10/20
Inventor 常磊邓春锋邵飞张永峰任方杰
Owner 中船双瑞(洛阳)特种装备股份有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap