Wear-resistant steel plate and manufacturing method thereof
A manufacturing method and wear-resistant technology, which can be used in manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problem of no research on the improvement of delayed fracture characteristics, and achieve excellent low temperature toughness, low environmental load, and excellent delayed crack resistance. Effect
Active Publication Date: 2017-11-07
JFE STEEL CORP
View PDF15 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] For example, the wear-resistant steel sheets excellent in delayed fracture resistance proposed in Patent Documents 1 to 6 can improve the delayed fracture resistance of the steel sheet in the as-manufactured state. Regarding the delayed fracture characteristics in the portion reheated to the low-temperature tempering embrittlement temperature range The improvement was not studied
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0114] Steels A to M having the composition shown in Table 1 were continuously cast into slabs, and hot rolled under the conditions shown in Table 2 to form steel sheets with a thickness of 25 to 60 mm. The Ar3 point of each steel is also shown in Table 2. Water cooling (direct quenching; DQ) was performed under the conditions shown in Table 2 immediately after rolling. The obtained steel sheets were subjected to microstructure observation, prior austenite grain size measurement, MA percentage, surface hardness measurement, Charpy impact test, and low-temperature tempering embrittlement cracking test in the following manner.
[0115] [Microstructure Observation]
[0116] Test pieces for microstructure observation were cut out from the 1 / 4 position and 3 / 4 position of the plate thickness of the obtained steel plate in such a manner that the observation surface was a cross-section parallel to the rolling direction, and then ground to a mirror surface, passed through nitric acid...
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
| Property | Measurement | Unit |
|---|---|---|
| particle size | aaaaa | aaaaa |
| particle size | aaaaa | aaaaa |
| hardness | aaaaa | aaaaa |
Login to View More
Abstract
The present invention provides a wear-resistant steel sheet excellent in low-temperature toughness and suppression of occurrence of cracks at portions heated to a low-temperature tempering embrittlement temperature range, and a method for producing the same. The composition of the steel sheet is in mass %: C: 0.100% to less than 0.175%, Si: 0.05% to 1.00%, Mn: 0.50% to 1.90%, P: less than 0.006%, S: 0.005% or less , Al: 0.005% to 0.100%, Cr: 0.10% to 1.00%, Nb: 0.005% to 0.024%, Ti: 0.005% to 0.050%, B: 0.0003% to 0.0030% , N: not less than 0.0010% and not more than 0.0080%. In addition, the microstructure at the 1 / 4 position of the plate thickness is a single-phase structure of martensite or a mixed structure of martensite and bainite with an average particle size of prior austenite of 20 μm or more and 60 μm or less, and bainite The area percentage of insular martensite in the body is less than 5% relative to the entire structure.
Description
technical field [0001] The present invention relates to a wear-resistant steel plate used in industrial machines, conveying machines, etc., and a method for producing the same, and relates to a steel plate having excellent low-temperature toughness, which can be used in a heat-affected zone after welding heat-affected zones, gas cutting, plasma cutting, etc. A wear-resistant steel sheet that is excellent in suppressing the occurrence of cracks caused by delayed fracture at parts heated to a low-temperature temper embrittlement temperature range of about 300°C to about 400°C. Background technique [0002] The wear resistance of steel is improved by increasing the hardness, and the steel used in components requiring wear resistance contains an amount of C corresponding to the required hardness, and is subjected to quenching treatment or quenching and tempering treatment. [0003] When the high-hardness wear-resistant steel plate is reheated to the low-temperature tempering emb...
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
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C21D8/02C22C38/38C22C38/58
CPCC21D8/02C22C38/00C22C38/38C22C38/58C21D8/0226C21D8/0263C21D1/18C21D2211/002C21D2211/008C21D9/46C21D2211/001C22C38/001C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/32C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54
Inventor 柚贺正雄三浦进一大森章夫
Owner JFE STEEL CORP