Formula and heat treatment process for high strength and high weldability steel casting
A weldability and high-strength technology, applied in the field of metal casting, can solve problems such as poor welding performance, and achieve the effect of satisfying performance and reliability guarantee
Inactive Publication Date: 2015-12-16
LUOYANG LUOBEI HEAVY IND MACHINERY
View PDF4 Cites 1 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0002] At present, domestic large-scale engineering mining vehicle frame castings are all made of low-alloy high-strength alloys, and high-quality comprehensive performance is achieved through quenching and tempering. The tensile strength is about 800MPa, but its welding performance is not good; while foreign Most of the large-scale engineering mining vehicle frame steel castings are made of ultra-low alloy components. Although the strength is lower than domestic ones, the tensile strength is generally around 400MPa, but its welding performance is good.
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 moreExamples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0011] A formula for high-strength, high-weldability steel castings, including the following chemical components in parts by mass: C: 0.21%, Si: 0.36%, Mn: 0.82%, P: 0.026%, S: 0.016%, Cr: 0.56%, Ni: 0.48%, Mo: 0.21%, Al: 0.036%, and the balance is Fe.
[0012] A heat treatment process for high-strength, high-weldability steel castings. Firstly, normalizing at 940°C, followed by quenching at 930°C and tempering at 580°C.
[0013] The normalizing process heats up at a rate of 100°C per hour, and heats up to 940°C for 4 hours of heat preservation. After the heat preservation is completed, open the furnace door, pull the casting out of the heat treatment furnace for air cooling, and cool to 250°C .
[0014] The quenching process heats up again at a rate of 100°C per hour, and heats up to 930°C for 4 hours of heat preservation. After the heat preservation is completed, the furnace door is opened, the casting is pulled out from the heat treatment furnace, put into water for water ...
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 |
|---|---|---|
| tensile strength | aaaaa | aaaaa |
| tensile strength | aaaaa | aaaaa |
Login to View More
Abstract
The invention relates to the technical field of metal casting, in particular to a formula and a heat treatment process for a high strength and high weldability steel casting. The high strength and high weldability steel casting comprises, by mass, 0.21% of C, 0.36% of Si, 0.82% of Mn, 0.026% of P, 0.016% of S, 0.56% of Cr, 0.48% of Ni, 0.21% of Mo, 0.036% of Al and the balanced Fe. The heat treatment technology for the high strength and high weldability steel casting comprises the steps that firstly, normalizing at the temperature of 800 DEG C to 1000 DEG C is carried out, and then quenching at the temperature of 850 DEG C to 1500 DEG C and tempering at the temperature of 500 DEG C to 600 DEG C are sequentially carried out. According to the process, the welding performance of the steel casing is greatly improved while the tensile strength of the steel casting is ensured, the use performance of the steel casting is met, and the guarantees are provided for safety and reliability of a mine car chassis.
Description
technical field [0001] The invention relates to the technical field of metal casting, in particular to a high-strength, high-weldability steel casting formula and a heat treatment process thereof. Background technique [0002] At present, domestic large-scale engineering mining vehicle frame castings are all made of low-alloy high-strength alloys, and high-quality comprehensive performance is achieved through quenching and tempering. The tensile strength is about 800MPa, but its welding performance is not good; while foreign Most of the large-scale engineering mining vehicle frame castings are made of ultra-low alloy components. Although the strength is lower than that in China, the tensile strength is generally around 400MPa, but its welding performance is good. Strength and weldability are two important indicators for the use of frame steel castings. It is the requirement and goal of market development to greatly improve its weldability while having high strength. Conten...
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): C22C38/44C21D1/18
Inventor 朱晓龙
Owner LUOYANG LUOBEI HEAVY IND MACHINERY