High-strength and high-toughness Cu-containing low-carbon martensitic stainless steel and heat treatment process thereof
A low-carbon martensite, high-strength and high-toughness technology, applied in the field of martensitic stainless steel, can solve the problems of loss of material strength, reduce martensitic dislocation density, etc., and achieve the effect of improving strength, high toughness, and convenient smelting and processing
Active Publication Date: 2022-05-13
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
View PDF11 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, a higher tempering temperature will significantly reduce the dislocation density of martensite, thereby losing the strength of the material
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
[0021] The alloy was smelted in a vacuum induction furnace, and the content of impurity elements such as S and P was strictly controlled to obtain Cu-free and Cu-containing low-carbon martensitic stainless steel. The chemical composition is shown in Table 1. After removing the riser of the casting, start forging at 1150°C, and the final forging temperature is 900°C. After forging, it is rolled at 1100°C for 3 hours, and the rolling deformation is about 66%.
[0022] Table 1: Chemical composition of Cu-containing low-carbon martensitic stainless steel (wt.%)
[0023] C Cr Ni Mo Cu Si mn P S Fe Component A 0.05 12.89 3.85 0.51 0.05 0.50 0.61 0.004 0.001 margin ingredient B 0.05 12.92 4.11 0.51 1.00 0.55 0.60 0.004 0.001 margin Component C 0.056 12.67 3.86 0.49 1.69 0.54 0.60 0.006 0.001 margin
[0024] The Cu content of component A in Table 1 is 0.05wt%, which is not within the range of 1-2wt% in the ...
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 |
|---|---|---|
| yield strength | aaaaa | aaaaa |
| tensile strength | aaaaa | aaaaa |
Login to View More
Abstract
The invention relates to the field of low-carbon martensitic stainless steel, in particular to high-strength and high-toughness Cu-containing low-carbon martensitic stainless steel and a heat treatment process thereof. The Cu-containing low-carbon martensitic stainless steel comprises the following chemical components in percentage by weight: less than or equal to 0.06% of C and 12-14% of Cr; 3%-5% of Ni; 0.4 to 0.7 percent of Mo; 1-2% of Cu; 0.3 to 0.6 percent of Si; mn < = 1%; p < = 0.04%; s < = 0.03%; and the balance of Fe. The heat treatment process comprises normalizing and secondary tempering, specifically, normalizing is conducted at the temperature of 1000-1050 DEG C, then air cooling is conducted to the room temperature, a martensite structure is obtained, then primary tempering is conducted at the temperature of 640-680 DEG C, and then secondary tempering is conducted at the temperature of 580-620 DEG C. The structure of the material subjected to heat treatment is tempered martensite, a nanoscale Cu-rich precipitated phase and a small amount of reversed austenite. According to the high-strength and high-toughness Cu-containing low-carbon martensitic stainless steel, through addition of Cu and a corresponding heat treatment process, the defect that low-carbon martensitic stainless steel is low in strength is overcome, the material has good strength and impact toughness at the same time, good toughness matching is achieved, and the high-strength and high-toughness Cu-containing low-carbon martensitic stainless steel has good application prospects.
Description
Technical field: [0001] The invention relates to the field of martensitic stainless steel, in particular to a high-strength and high-toughness Cu-containing low-carbon martensitic stainless steel and a heat treatment process thereof. Background technique: [0002] 0Cr13Ni4Mo low-carbon martensitic stainless steel is widely used in turbine components, valve bodies, nuclear power plant pressure vessels, offshore drilling platforms and other hydropower plant unit runners and blades and nuclear power engineering components due to its excellent comprehensive performance. The excellent performance is closely related to the reversed austenite structure. Inverted austenite significantly improves the plasticity and toughness of low-carbon martensitic stainless steel, especially the low-temperature toughness, which is a key phase in the material. However, for low-carbon martensitic stainless steel such as 0Cr13Ni4Mo, an appropriate amount of reversed austenite is usually tempered at ...
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 Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/44C21D6/00
CPCC22C38/44C22C38/42C22C38/02C22C38/04C21D6/004C21D6/008C21D6/005C21D2211/008C21D2211/001C21D2211/004Y02P10/20
Inventor 宋元元姜海昌胡小锋戎利建
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI