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A kind of 1100mpa grade high-strength strapping steel and its production method

A production method and strip steel technology, applied in the field of metallurgy, can solve the problems of lead bath environmental pollution, bluish layer easy to fall off, high annealing cost, etc., to improve product strength, save quenching or lead bath process, and improve annealing recrystallization The effect of temperature

Active Publication Date: 2021-08-13
唐山钢铁集团高强汽车板有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The current production process of high-strength strapping steel is mainly two kinds of medium temperature quenching and tempering and lead bath isothermal quenching. The equipment of these two processes is complicated, the annealing cost is high, and the lead bath will cause serious pollution to the environment; in terms of composition selection, At present, high-strength strap steel generally adopts two design schemes of C-Si-Mn composition or Nb-Ti composite strengthening. The former is cold-rolled due to the high content of C and Mn (generally, the C content is greater than 0.3%, and the Mn content is greater than 1.5%). , Welding during the annealing process has adverse effects, and its Si content is generally above 0.4%. Higher Si content has adverse effects on bluing, and the bluing layer is easy to fall off; the latter adds higher Nb and Ti alloy elements, and the cost higher

Method used

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  • A kind of 1100mpa grade high-strength strapping steel and its production method
  • A kind of 1100mpa grade high-strength strapping steel and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The thickness specification of the 1100MPa grade high-strength strapping steel in this embodiment is 0.90mm, and its chemical composition and mass percentage are shown in Table 1.

[0025] The production method of the 1100MPa grade high-strength strap steel of the present embodiment comprises steelmaking, continuous casting, hot rolling, cold rolling, bluing operation, and concrete process step is as follows:

[0026] (1) Steelmaking process: see Table 1 for the chemical composition and mass percentage of molten steel;

[0027] (2) Continuous casting process: dynamic light reduction is adopted, the reduction amount is 3mm, and the thickness of continuous casting slab is 200mm;

[0028] (3) Hot rolling process: the heating furnace exit temperature is 1185°C, and the final rolling temperature is 835°C; the steel coil is cooled in three stages, the first stage is water-cooled to 710°C at a cooling rate of 65°C / s, and the second stage is air-cooled 3.5s, the third section ...

Embodiment 2

[0033] In this embodiment, the thickness specification of the 1100MPa grade high-strength strap steel is 1.00mm, and its chemical composition and mass percentage are shown in Table 1.

[0034] The production method of the 1100MPa grade high-strength strap steel of the present embodiment comprises steelmaking, continuous casting, hot rolling, cold rolling, bluing operation, and concrete process step is as follows:

[0035] (1) Steelmaking process: see Table 1 for the chemical composition and mass percentage of molten steel;

[0036] (2) Continuous casting process: dynamic light reduction is adopted, the reduction amount is 3mm, and the thickness of continuous casting slab is 200mm;

[0037] (3) Hot rolling process: the heating furnace exit temperature is 1168°C, and the final rolling temperature is 820°C; the steel coil is cooled in three stages, the first stage is water-cooled to 720°C at a cooling rate of 82°C / s, and the second stage is air-cooled 3.5s, the third section is ...

Embodiment 3

[0042] The thickness specification of the 1100MPa grade high-strength strap steel in this embodiment is 0.80mm, and its chemical composition and mass percentage are shown in Table 1.

[0043] The production method of the 1100MPa grade high-strength strap steel of the present embodiment comprises steelmaking, continuous casting, hot rolling, cold rolling, bluing operation, and concrete process step is as follows:

[0044] (1) Steelmaking process: see Table 1 for the chemical composition and mass percentage of molten steel;

[0045] (2) Continuous casting process: dynamic light reduction is adopted, the reduction amount is 3mm, and the thickness of continuous casting slab is 200mm;

[0046] (3) Hot rolling process: the heating furnace exit temperature is 1210°C, and the final rolling temperature is 838°C; the steel coil is cooled in three stages, the first stage is water-cooled to 700°C at a cooling rate of 70°C / s, and the second stage is air-cooled 4.0s, the third section is w...

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Abstract

The invention discloses a 1100MPa high-strength strap steel and a production method thereof. The chemical composition and mass percentage of the strap steel are: C: 0.20-0.25%, Si: 0.15-0.30%, Mn: 1.15- 1.35%, P≤0.020%, S≤0.010%, Als: 0.020~0.050%, Nb: 0.015~0.030%, N≤0.0050%, the balance is Fe and unavoidable impurities; the production method includes steelmaking, Continuous casting, hot rolling, cold rolling, blueing process. The composition design of the present invention adopts medium and low C, conventional Mn content, adds a small amount of Si and Nb elements, and under the condition of reasonable control of C, Mn, Si content and alloy cost, through hot rolling controlled rolling and controlled cooling, large reduction cold rolling, Low temperature bluing and other process control to obtain high-strength strapping steel with tensile strength ≥ 1100MPa and elongation A30 ≥ 8%.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a 1100MPa grade high-strength strap steel and a production method thereof. Background technique [0002] Strapping steel (referred to as strapping), usually refers to the steel strip used for industrial packaging, and is widely used in industrial fields such as steel, non-ferrous metals, papermaking, glass, building materials, tobacco and textile processing. [0003] At present, my country's iron and steel industry is the industry that uses the most strapping products and has the highest load safety rating. It is mainly used for steel rolling and finished product packaging units in steel manufacturing. On the one hand, with the rapid development of my country's iron and steel industry in recent years, coupled with the fact that steel companies in developed countries have increased the packaging of steel coils to the level of "guaranteeing safe storage and transport...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C21D8/02C21D1/26
CPCC21D1/26C21D8/0226C21D8/0236C21D8/0273C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 武冠华谭文振李雅琴马德刚李建英李波冯慧霄宋晓娟孙宏亮
Owner 唐山钢铁集团高强汽车板有限公司
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