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Production process of high-toughness and ultra-high strength steel and production system thereof

A technology of ultra-high-strength steel and production technology, which is applied in the field of steelmaking, can solve the problems of low straight line rate of steel plate, cumbersome production management, and reduce production cost, and achieve the effects of facilitating production management, reducing production cost, and improving straight line rate

Inactive Publication Date: 2012-02-01
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High-strength steel production heat treatment Q+P process requires reheating, quenching, and carbon distribution of the steel plate after rolling. The process is complicated, which is not conducive to reducing production costs
The steel plate needs to be reversed in the workshop after rolling, the logistics is complicated, the straight line rate of the steel plate is low, and the production management is cumbersome

Method used

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  • Production process of high-toughness and ultra-high strength steel and production system thereof
  • Production process of high-toughness and ultra-high strength steel and production system thereof
  • Production process of high-toughness and ultra-high strength steel and production system thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: 260X2080X3450 slab rolling to produce 30X3200XL ultra-high strength steel plate.

[0033] Its process steps are as follows:

[0034] a. Slab heating, the heating temperature is 1230-1250°C, the heating coefficient is 9-10min / cm, and the furnace temperature is 1150-1160°C;

[0035] b. The slab is fully descaled and the surface oxide scale is removed;

[0036] c. The rolling start temperature is 1050-1070°C. After the slab is widened, the rough rolling is guaranteed to have more than two passes and the reduction rate is greater than 15%, so as to realize slow rolling under high temperature and high pressure. The rough rolling finish rolling temperature is 950- 970°C, the intermediate billet is controlled to 103mm;

[0037] d. Wait for the temperature of the roller table to reach 830-850°C;

[0038] e. The starting temperature of finish rolling is 830-850°C, and the finishing rolling temperature is 810-830°C. After the steel plate is rolled, it enters the pre...

Embodiment 2

[0047] Example 2: 260X2080X3450 slab rolling to produce 40X3500XL ultra-high strength steel plate.

[0048] Its process steps are as follows:

[0049] a. Slab heating, the heating temperature is 1150-1250°C, the heating coefficient is 9-10min / cm, and the furnace temperature is 1130-1150°C;

[0050] b. The slab is fully descaled and the surface oxide scale is removed;

[0051] c. The rolling start temperature is 1050-1080°C, ensuring that there are more than two passes of rough rolling, and the reduction rate is greater than 15%, realizing slow rolling under high temperature and high pressure. ;

[0052] d. The temperature of the roller table is 820 ~ 840 ℃;

[0053] e. The start rolling temperature of finish rolling is 820-840°C, the finish rolling temperature is 800-820°C, and the steel plate enters the pre-leveler for straightening after rolling. The rolling process parameters are shown in Table 2;

[0054] Table 2 The main parameters involved in the rolling process of Exa...

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Abstract

The invention relates to a production process of high-toughness and ultra-high strength steel and a production system thereof. The production system comprises a descaling box, a roughing mill, a temperature waiting roller table, a finishing mill, an ultra-fast cooling system, a thermal straightening machine, steel splitting racks and an open flame tempering furnace. The production process comprises the following steps of: fully heating a plate blank, discharging the plate blank from a furnace, descaling the plate blank, sequentially performing rough rolling, temperature waiting, finish rolling, on-line ultra-fast quenching and fast thermal straightening, separating the plate blank from a main production line through the steel splitting racks, fast sending a steel plate into the open flame tempering furnace for heat insulation, performing carbon distribution at PT (carbon distribution temperature), discharging the steel plate from the furnace, and then performing air cooling. The sequential arrangement of equipment of the production line is as follows: the heating furnace, the plate blank, the descaling box, the roughing mill, an intermediate blank, the finishing mill, a pre-straightening machine, an ultra-fast cooling unit, the thermal straightening machine, the first steel splitting rack, the open flame tempering furnace, the second steel splitting rack, a thick plate cooling bed and an intermediate plate cooling bed.

Description

technical field [0001] The invention belongs to steelmaking technology, in particular to a production process and production system of high-toughness and ultra-high-strength steel. Background technique [0002] High-strength structural steel plates are widely used in construction machinery, mining machinery, vehicles, ships, bridges and other industries. With the development of the national economy, new requirements are put forward for high-strength steel: higher strength (above 1000MPa) and certain plasticity and low temperature toughness. For this reason, various medium and heavy plate factories have carried out a lot of research and developed many high-strength steel production methods and production processes. [0003] At present, the production processes of high-strength steel in various steel mills are generally CR, CR+ACC(TMCP)+T, DQ+T and off-line quenching RQ+T. In a typical production process, it needs to be pointed out that the direct online quenching process (...

Claims

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Application Information

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IPC IPC(8): C21D8/02
Inventor 杨云清
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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