High-strength stainless steel sheet and method for manufacturing the same

A technology of stainless steel plate and manufacturing method, which is applied in the direction of manufacturing tools, building reinforcements, building structures, etc., which can solve the problems of high manufacturing cost, insufficient stamping formability of welded parts, and unfavorable guarantee of rigidity, etc.

Active Publication Date: 2004-12-01
JFE STEEL CORP
View PDF6 Cites 27 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But if Figures 5A-5C As shown, in the forming process of the bicycle rim, it is an inevitable process to punch the hole for passing the spoke at the seam welding position, and the rim of the steel plate (steel strip) manufactured using the technology described in these 4 documents is in the punching process. When making holes for spokes, cracks may occur in the seam welded part, and there is a problem that the stamping formability of the welded part is insufficient
[0012] On the other hand, it is considered to cold-roll austenitic stainless steel such as SUS304 used as a bicycle rim to increase its strength, but the Young's modulus of austenitic stainless steel is small, which is not good for ensuring rigidity. In addition, austenitic stainless steel plates contain 8 There is a problem that the production cost is high because the expensive Ni is more than the mass %

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
  • High-strength stainless steel sheet and method for manufacturing the same
  • High-strength stainless steel sheet and method for manufacturing the same
  • High-strength stainless steel sheet and method for manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0155] With the stainless steel plate of composition shown in table 1 and table 2 as raw material, the batch type annealing furnace of condition shown in table 3 and table 4 is carried out finished product heat treatment with this raw material, pickling then. (1) Observation of metal structure, (2) Tensile test, (3) Corrosion test, (4) Bending test, (5) Welding heat-affected zone toughness test was carried out on the obtained steel plate with plate thickness t=3mm. The test method is as follows. The hot-rolled steel sheet as the raw material is manufactured by heating a 100kgf steel ingot melted in a high-frequency furnace to 1200°C with the composition shown in Tables 1 and 2, and hot-rolling it to a thickness (t) of 3 mm with a reversing rolling mill.

[0156] (1) Observation of metal structure

[0157] Take the metal structure observation test piece (t (original thickness) × 10mm × 10mm each 1 piece) from the obtained steel plate, and use Murakami reagent (alkaline solutio...

Embodiment 2

[0172] Next, the characteristics of the cold-rolled steel sheet were studied. The 3 mm thick hot-rolled steel sheet No. 1K in Table 1 of Example 1 above was annealed at 700° C. for 10 hours and then slowly cooled, and then the scale was removed by pickling. Next, the hot-rolled and annealed steel plate is cold-rolled to a plate thickness of 1.5mm with a reversing rolling mill, held at 1000°C for 30s, cooled at a rate of 15°C / s to the cooling stop temperature of 100°C, and then dipped to 60°C. A mixed acid (nitric acid 10% by mass + hydrofluoric acid 3% by mass) was used to descale the scale to obtain a cold-rolled steel sheet having a thickness t=1.5 mm. The same test as the hot-rolled steel sheet of Example 1 above was carried out.

[0173] However, TIG welding (current 95A, voltage 11V, welding speed 400mm / min, shielding gas on the surface (electrode) side: 20l / min, backside 10l / min) was used for welding to study the toughness of the welded part. As a result, the volume fr...

Embodiment 3

[0175] With the stainless steel cold-rolled steel sheet of composition shown in Table 5 and Table 6 as raw material, carry out finished product heat treatment with batch-type annealing furnace with the conditions shown in Table 7 and Table 8 to this raw material, and carry out pickling. The same (1) metal structure observation, (2) tensile test, and (3) corrosion test as in Example 1 were performed on the obtained steel plate having a plate thickness of t=0.7 mm. As the cold-rolled steel sheet as the raw material, a 100kgf steel ingot whose composition is shown in Table 5 and Table 6 is dissolved in a high-frequency furnace is heated to 1200°C, hot-rolled to 3mm with a reversing rolling mill, and then slowed down at 700°C for 10 hours. After cold annealing and pickling to remove scale, the hot-rolled steel sheet was cold-rolled to a thickness of 0.7 mm with a reversing rolling mill.

[0176] As an example of metal structure observation of (1), figure 2 An optical microscope ...

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

PropertyMeasurementUnit
tensile strengthaaaaaaaaaa
tensile strengthaaaaaaaaaa
tensile strengthaaaaaaaaaa
Login to view more

Abstract

Provided is a high-strength stainless steel sheet having superior corrosion resistance, bending workability, toughness at a weld zone, and besides stamping workability at the weld zone, and to provide a manufacturing method therefor. This high-strength stainless steel sheet has a composition including 0.02% or less C, 0.02% or less N, 11% to 17% Cr, and an appropriate amount of Si, Mn, P, S, Al and Ni, while satisfying the expressions of 12<=Cr+Mo+1.5Si<=17, 1<=Ni+30(C+N)+0.5(Mn+Cu)<=4, Cr+0.5(Ni+Cu)+3.3Mo>=16.0 and 0.006<=C+N<=0.030. The manufacturing method includes subjecting a stainless steel sheet having the above composition to a heat treatment of heating it to 850 to 1,250[deg.]C, and cooling it at a cooling rate of 1[deg.]C / s or higher. Thereby, the produced high-strength stainless steel sheet has a structure containing 12% or more martensitic phase by a volume ratio, has a high strength of 730 MPa or higher, and is superior in corrosion resistance, bending workability and a toughness of a weld heat-affected zone. When the high-strength stainless steel sheet indispensably contains Mo and B, it further improves the stamping workability of the weld zone, which is an important property for a rim material of a bicycle and the like.

Description

technical field [0001] The present invention relates to a high-strength stainless steel plate, in particular to a high-strength stainless steel plate suitable for civil and architectural structural parts requiring corrosion resistance or welded structural parts for bicycles, automobiles, railway vehicles and other vehicles requiring corrosion resistance. Furthermore, the present invention relates to a high-strength stainless steel plate that is suitable for use as, for example, wheels such as bicycle rims, and is excellent in corrosion resistance and press workability of welded parts. Background technique [0002] As high-strength stainless steel sheets for structural parts requiring corrosion resistance, cold-rolled austenitic stainless steel sheets or martensitic stainless steel sheets that have been quenched and tempered have been widely used in the past. [0003] However, the austenitic stainless steel plate has a small Young's modulus, which is unfavorable for ensuring ...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/46C21D6/00C21D8/02C22C38/00C22C38/18C22C38/58
CPCC21D8/0205C21D2211/008C21D6/002C22C38/02C22C38/06C22C38/04C21D2211/005C22C1/002C22C38/44C21D6/004C22C1/11E04C5/18
Inventor 平泽淳一郎宇城工古君修
Owner JFE STEEL CORP
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