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Galvanized-free high-strength and plastic cold-rolled stainless steel sheet for automobiles and manufacturing method thereof

A technology of stainless steel plate and manufacturing method, which is applied in the field of metallurgy, and can solve the problems of low formability, low material cost, etc., such as hole expansion and bending properties

Active Publication Date: 2017-02-22
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(Martensite + ferrite) duplex stainless steel basically does not contain Ni, and the material cost is low. It comprehensively utilizes the advantages of high strength of martensite and good plasticity of ferrite. Large, its formability such as hole expandability and bendability is low

Method used

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  • Galvanized-free high-strength and plastic cold-rolled stainless steel sheet for automobiles and manufacturing method thereof
  • Galvanized-free high-strength and plastic cold-rolled stainless steel sheet for automobiles and manufacturing method thereof
  • Galvanized-free high-strength and plastic cold-rolled stainless steel sheet for automobiles and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] The manufacturing method of A# steel is: smelting according to the set composition, and casting to make continuous casting slab; the heating temperature of the slab is 1150°C, and the holding time is 1h; the starting temperature of hot rolling is 1100°C, and the finishing temperature is 900°C. The total reduction rate of hot rolling is 92%, and the coiling temperature is 650°C; the annealing temperature of hot-rolled sheet is 950°C, and the holding time is 4min; the total reduction rate of cold rolling is 80%; the austenitization temperature of cold-rolled sheet is 1040°C, hold for 2 minutes, then rapidly cool to 300-380°C at a rate of 80°C / s, then heat to 350-450°C, hold for 2.5-60 minutes, and finally cool to room temperature at a rate of 100°C / s ; The microstructure of A# steel contains ferrite, martensite and retained austenite, in which the volume fraction of ferrite is 65%, the volume fraction of retained austenite is 1-5%, and the rest is martensite body;

[009...

Embodiment 2

[0108] The manufacturing method of B# steel is: smelting according to the set composition, and casting into ingot; the ingot heating temperature is 1100°C, holding time is 1h; The total rolling reduction rate is 92%, and the coiling temperature is 600°C; the hot-rolled sheet annealing temperature is 880°C, and the holding time is 10min; the cold-rolled total reduction rate is 40%; the cold-rolled sheet austenitization temperature is 1040 ℃, the holding time is 2min, then rapidly cooled to 300-400℃ at a rate of 80℃ / s, then heated to 350-450℃, and kept at a temperature of 15-60min, and finally rapidly cooled to room temperature at a rate of 100℃ / s; The microstructure of B# steel contains ferrite, martensite and retained austenite, in which the volume fraction of ferrite is 55%, the volume fraction of retained austenite is 2-8%, and the rest is martensite ;

[0109] The mechanical properties of B# steel are yield strength 391-428MPa, tensile strength 668-702MPa, elongation at br...

Embodiment 3

[0116] The manufacturing method of C# steel is: smelting according to the set composition, and casting to make continuous casting slab; the heating temperature of casting slab is 1200°C, and the holding time is 2h; the starting temperature of hot rolling is 1150°C, and the finishing temperature is 800°C. The total reduction rate of hot rolling is 95%, and the coiling temperature is 500°C; the annealing temperature of hot rolled sheet is 800°C, and the holding time is 8h; the total reduction rate of cold rolling is 75%; the austenitization temperature of cold rolled sheet is 1000°C, holding time is 2min, then rapidly cooling to 100-200°C at a rate of 20°C / s, then heating to 450-575°C, holding for 1-60min, and finally rapidly cooling to room temperature at a rate of 20°C / s ;

[0117]The microstructure of C# steel contains ferrite, martensite and retained austenite, in which the volume fraction of ferrite is 55%, the volume fraction of retained austenite is 2-12%, and the rest is...

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Abstract

A galvanized-free high-strength and plastic cold-rolled stainless steel plate for automobiles and a manufacturing method thereof, belonging to the field of metallurgical technology. Its composition contains Cr 11.0~17.0%, C 0.01~0.12%, Mn 0.2~0.5%, Si 0.2~1.1%, Al 0.005~0.5%, Ni<0.3%, Nb<0.2%, Ti<0.2% by weight. , V<0.2%, Mo<0.1%, Cu<0.03%, N<0.05%, P<0.03%, S<0.003%, the balance is Fe; its manufacturing methods include casting, hot rolling, cold rolling and quenching ‑Heat treatment for dispensing Q&P processes. The galvanized-free high-strength and plastic cold-rolled stainless steel plate for automobiles of the present invention eliminates the need for surface galvanizing. The material cost is significantly lower than austenitic stainless steel. The structure contains martensite, residual austenite and optional ferrite, and has Good combination of strength and plasticity, especially suitable for processing automobile structural parts and reinforcement parts.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a galvanized-free high-strength and plastic cold-rolled stainless steel plate for automobiles and a manufacturing method thereof. Background technique [0002] With the rapid development of the automobile industry, my country has become the third largest automobile producer and the second largest automobile consumer in the world, with an annual production of more than 20 million automobiles and an annual consumption of more than 22 million tons of various automobile plates. At present, reducing fuel consumption and improving body safety are prominent requirements in the development of automobiles. Reducing the weight of the car body is an effective way to reduce fuel consumption. However, if only the cross-sectional size of the car components is reduced, the strength of the car body will be insufficient. strength. At present, advanced high-strength steel (AHSS) with good str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/18C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/40C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C21D8/02
Inventor 谢胜涛刘振宇王国栋
Owner NORTHEASTERN UNIV LIAONING
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