Soft ferritic stainless steel and manufacture method thereof

A manufacturing method, ferrite technology, applied in the direction of manufacturing tools, temperature control, heat treatment process control, etc., can solve the problems of unfavorable commemorative coin embossing, insufficient wear resistance, etc.

Inactive Publication Date: 2008-06-25
BAOSHAN IRON & STEEL CO LTD
View PDF0 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used ferritic stainless steel such as 0Cr17 or 5f1Cr17, because of its high hardness is not conducive to the embossing of commemorative coins, and too soft ferritic stainless steel is too soft, and the wear

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
  • Soft ferritic stainless steel and manufacture method thereof
  • Soft ferritic stainless steel and manufacture method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0049] The composition of the embodiment is shown in Table 1, the manufacturing process is shown in Table 2, the mechanical properties are shown in Table 3, and the results of the corrosion resistance comparison test with SUS430 are shown in Table 4, using 10% FeCl 3 Solution carries out immersion test, and test solution temperature is 50 ℃, and immersion time is 5 hours, and sample size is 20mm (long) * 40mm (wide) * 1.7mm (thick), as can be seen from Table 4, the present invention is more resistant than SUS430 Chlorides are much more corrosive. The metallographic picture of the test steel cold-rolled and annealed is shown in Figure 1a , Figure 1b , the grain grade is 7.5. The finer the grain, the higher the strength of the steel and the higher the hardness, so the material does not need to pursue high grain size indefinitely.

[0050] Table 1

[0051] Unit: mass percentage

[0052] Example

[0053] Table 2

[0054]

[0055] 6

[0056] Tab...

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 discloses soft ferritic stainless steel and a method for manufacturing the same, wherein the mass percentage compositions of the stainless steel are: 0.01 to 0.03 percent by mass of C, 0.2 to 0.4 percent by mass of Mn, 0.2 to 0.4 percent by mass of Si, 15 to 17 percent of Cr, less than or equal to 0.025 percent of N, less than or equal to 0.020 percent of P, less than or equal to 0.0030 percent of S and the balance Fe and unavoidable impurities; the method comprises the following: 1) a step of smelting and continuous casting, in which molten iron and alloy material are subject to treatment by an AOD furnace and a VOD furnace, making the content of each composition with in the required range and then to continuous casting to be formed into blanks; 2) a step of heating plate blanks, in which the plate blanks are heated to between 1050 and 1100 DEG C for no less than 180 minutes; 3) a step of hot rolling, in which the finishing temperature is between 860 and 880 DEG C, the coiling temperature is 750+-20 DEG C; 4) a step of heat treatment after rolling, in which the annealing temperature is between 860 and 900 DEG C, with acid cleaning; 5) a step of cold rolling, in which the total draft is more than or equal to 70 percent; 6) a step of heat treatment after rolling, in where the annealing temperature is between 880 and 920 DEG C. The stainless steel manufactured by the invention is low in cost, moderate in flexibility and has certain anti-corrosion and wear-resistance properties.

Description

technical field [0001] The invention relates to a soft ferritic stainless steel and a manufacturing method thereof. Background technique [0002] Because ferritic stainless steel does not contain nickel or contains a small amount of nickel, its cost is much lower than that of austenitic stainless steel, and because it has excellent local corrosion resistance such as chloride stress corrosion resistance, pitting corrosion resistance and crevice corrosion resistance, It is widely used in household appliances, kitchen and bathroom, containers, manufacturing and automobile industries, etc. However, ferritic stainless steel is rarely reported on the use of commemorative coins, game coins, and handicrafts with embossed patterns. Commemorative coins are often used because of their specific meaning and requirements, and the cost of materials used is relatively high. Gold, silver, Au- Ag alloy, some commemorative coins are made of Cu-Ni alloy plated with brass or gold, and the patte...

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): C22C38/18C22C33/04C21C7/068C21C7/06C21C7/072B21B37/74B22D27/02C21D8/02C21D11/00
Inventor 常锷毛惠刚王伟明李伯平沈春飞
Owner BAOSHAN IRON & STEEL CO LTD
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