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Continuous annealing method for cool-rolled thick high strength steel plates

A high-strength steel plate and thick-gauge technology, applied in the field of ferrous metal processing, can solve the problems of inconsistent parts size, large forming springback, and unfavorable safety of structural parts, achieving good product consistency, good production controllability, and implementation. less difficult effect

Active Publication Date: 2015-04-01
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because the yield strength is lower than 340MPa, the tensile strength is lower than 410MPa, and the elongation is lower than 21%, the low strength does not meet the lightweight design requirements of structural parts, and it is also detrimental to the safety of structural parts; the yield strength is higher than 420MPa, The tensile strength is higher than 510MPa. In the process of manufacturing parts, it is easy to cause stamping cracks and large springback of forming, which will cause the size of the parts to be inconsistent.

Method used

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  • Continuous annealing method for cool-rolled thick high strength steel plates
  • Continuous annealing method for cool-rolled thick high strength steel plates
  • Continuous annealing method for cool-rolled thick high strength steel plates

Examples

Experimental program
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Effect test

Embodiment 1

[0044] The chemical composition of the steel plate of this embodiment is C content 0.06wt%, Si content 0.01wt%, Mn content 0.50wt%, P content 0.005wt%, S content 0.005wt%, Nb content 0.015wt%, Als content 0.001wt% , Fe balance. The cleaned and dried cold-rolled thick-gauge high-strength steel plate is placed in the heating treatment section of the galvanizing / continuous annealing dual-purpose unit, and the furnace temperature in the heating treatment section is raised to 720°C after 20 seconds; The steel plate is sent to the soaking treatment section with a furnace temperature of 770°C, and the soaking treatment lasts for 30 seconds; after the soaking treatment is completed, the steel plate is transferred to the rapid cooling treatment section with a steel plate moving device, and the temperature of the steel plate is cooled to 250°C in 10 seconds; After the rapid cooling treatment is completed, use the steel plate moving device to transfer the steel plate to the overaging tre...

Embodiment 2

[0046] The chemical composition of the steel plate of this embodiment is C content 0.12wt%, Si content 0.10wt%, Mn content 1.2wt%, P content 0.025wt%, S content 0.020wt%, Nb content 0.050wt%, Als content 0.08wt% , Fe balance. The cleaned and dried cold-rolled thick-gauge high-strength steel plate is placed in the heating treatment section of the galvanizing / continuous annealing dual-purpose unit, and the furnace temperature in the heating treatment section is raised to 745°C after 90 seconds; The steel plate is sent to the soaking treatment section with a furnace temperature of 790°C, and the soaking treatment lasts for 60 seconds; after the soaking treatment is completed, the steel plate is transferred to the rapid cooling treatment section with a steel plate moving device, and the temperature of the steel plate is cooled to 300°C in 60 seconds; After the rapid cooling treatment is completed, use the steel plate moving device to transfer the steel plate to the overaging treat...

Embodiment 3

[0048] The chemical composition of the steel plate of this embodiment is C content 0.08wt%, Si content 0.07wt%, Mn content 0.7wt%, P content 0.015wt%, S content 0.010wt%, Nb content 0.030wt%, Als content 0.04wt% , Fe balance. The cleaned and dried cold-rolled thick-gauge high-strength steel plate is placed in the heating treatment section of the galvanizing / continuous annealing dual-purpose unit, and the furnace temperature in the heating treatment section is raised to 730°C after 70 seconds; The steel plate is sent to the soaking treatment section with a furnace temperature of 780°C, and the soaking treatment lasts for 50 seconds; after the soaking treatment is completed, the steel plate is transferred to the rapid cooling treatment section with a steel plate moving device, and the temperature of the steel plate is cooled to 280°C in 45 seconds; After the rapid cooling treatment is completed, use the steel plate moving device to transfer the steel plate to the overaging treat...

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Abstract

The invention discloses a continuous annealing method for cool-rolled thick high strength steel plates. The cool-rolled steel plates are placed into a heating furnace firstly, the furnace temperature of the heating furnace rises to be 720-745 DEG C after 20-90 seconds, then the furnace temperature of the heating furnace rapidly rises to be 770-790 DEG C and is kept for 30-60 seconds, the steel plates are placed into a non-oxidizing atmosphere composed of H2 and N2, the steel plates are subjected to rapid cooling treatment and cooled to be 250-300 DEG C rapidly after 10-60 seconds, the furnace temperature of 250-300 DEG C is kept for 90-300 seconds, then the cooling period with water as a cooling medium is started, and the steel plates are cooled to be 60-100 DEG C rapidly within 1-10 seconds. Batched continuous annealing operation of the cool-rolled thick high strength steel plates is achieved, product consistency is good, the implementation difficulty of the manufacturing process is small, production controllability is good, and the production cost is low.

Description

technical field [0001] The invention relates to the technical field of ferrous metal treatment, in particular to a continuous annealing method for cold-rolled thick-gauge high-strength steel plates. Background technique [0002] According to the definition of the ULSAB project team of the World Iron and Steel Association, steel with a yield strength in the range of 210-550 MPa is defined as high-strength steel. Thick-gauge steel is determined according to the production capacity of the unit, and cold-rolled steel with a thickness specification of 1.5-2.0mm is usually called thick-gauge steel. Cold-rolled thick-gauge high-strength steel plate is a product with high surface quality between hot-rolled ultra-thin gauge and cold-rolled extremely thick gauge, and is widely used in the automotive and home appliance electronics industries. The industrial annealing of cold-rolled thick-gauge high-strength steel plates mainly includes bell furnace annealing and continuous annealing f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/26C21D9/46C21D6/00C22C38/12
Inventor 张功庭郑之旺张林王敏莉梁英
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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