Single-steel multi-level hot-rolled complex-phase high-strength steel plate and production method thereof

A technology of high-strength steel plate and production method, which is applied in the field of hot-rolled high-strength high-strength steel plate and its production, can solve the problems of high capacity requirements for coiling equipment, poor production conditions, and complicated procedures, and achieve good bake hardening performance, The production control is less difficult and the effect of uniform mechanical properties

Active Publication Date: 2017-05-31
TANGSHAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, Publication No. CN103045950A introduces a low-alloy high-strength toughness multi-phase steel and its heat treatment method, which mainly realizes the structure of the multi-phase steel through quenching process and then tempering, which adopts a higher C content, and the welding performance of parts poor
Publication No. CN103589954A introduces a multi-stage hot-rolled steel plate and its manufacturing method. It adopts segmental cooling and different coiling temperatures to achieve different strength levels, which cannot guarantee the uniformity of steel coil performance, and requires low temperature coiling. To achieve automatic control, it is necessary to add a low-temperature coiling pyrometer, and the requirements for the capacity of the coiling equipment are also high
Publication No. CN101225499A introduces a low-alloy ultra-high-strength multi-phase steel and its heat treatment method. After the workpiece is austenitized, it needs to undergo three times of quenching / insulation treatment. The process is more complicated, and there are many quenching media. poor condition
Publication No. CN103667948A introduces a multiphase steel and its preparation method, which adds higher P, which may affect the performance of the material

Method used

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  • Single-steel multi-level hot-rolled complex-phase high-strength steel plate and production method thereof
  • Single-steel multi-level hot-rolled complex-phase high-strength steel plate and production method thereof
  • Single-steel multi-level hot-rolled complex-phase high-strength steel plate and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1: The specific production process of the multi-stage hot-rolled multi-phase high-strength steel plate of Benyi Steel is as follows.

[0044] (1) Steelmaking and casting: The weight percentage of the chemical composition of the molten steel is: C 0.10%, Mn 2.5%, S0.012%, P 0.025%, Si 0.8%, Als 0.04%, Cr 0.60%, Ti 0.015% , Mo 0.10%, N 0.005%, and the rest are iron and unavoidable impurities. In the casting step, the superheat of molten steel is 30°C; under dynamic light pressure, the crystallizer liquid level fluctuation is stably controlled within ± 2mm.

[0045] (2) Heating process: the slab is heated to 1270-1300°C, held for 3.0 hours, the descaling temperature after the furnace is 1130°C, and the temperature difference between the head and tail of the slab is ≤20°C.

[0046] (3) Hot rolling process: the starting temperature of finish rolling is 1040±10°C, the temperature of finishing rolling is 890±10°C, and the thickness of the rolled steel plate is 8.0mm. ...

Embodiment 2

[0052] Example 2: The specific production process of the multi-stage hot-rolled multi-phase high-strength steel plate of Benyi Steel is as follows.

[0053] (1) Steelmaking and casting: The weight percentage of the chemical composition of the molten steel is: C 0.08%, Mn 1.80%, S0.006%, P 0.012%, Si 1.0%, Als 0.045%, Cr 0.80%, Ti 0.035% , Mo 0.3%, N 0.006%, and the rest are iron and unavoidable impurities. In the casting step, the superheat of molten steel is 25°C; under dynamic light pressure, the crystallizer liquid level fluctuation is stably controlled within ± 2mm.

[0054] (2) Heating process: The slab is heated to 1250-1270°C, held for 2.5 hours, the descaling temperature after the furnace is 1135°C, and the temperature difference between the head and tail of the slab is ≤20°C.

[0055] (3) Hot rolling process: the starting temperature of finish rolling is 1090±10°C, the temperature of finishing rolling is 870±10°C, and the thickness of the rolled steel plate is 1.8mm. ...

Embodiment 3－7

[0061] Embodiment 3-7: The specific production process of the multi-stage hot-rolled multi-phase high-strength steel plate of Benyi Steel is as follows.

[0062] Except for the step (6) annealing process, the others are the same as in Example 1; the specific process of the step (6) annealing process is shown in Table 1.

[0063] Table 1: Annealing process of embodiment 3-7

[0064] Example 3 Example 4 Example 5 Example 6 Example 7 Annealing temperature / ℃ 1000 900 900 950 1000 Holding time / h 3 5 3 2 2.5 cooling method baked air-cooled baked air-cooled Cooling with the furnace Cooling with the furnace Cooling with the furnace

[0065] The metallographic structure obtained in Examples 3-7 is ferrite-martensite-a small amount of retained austenite, and the performance indexes of the multiphase high-strength steel plate are shown in Table 4.

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Abstract

The invention discloses a single-steel multi-stage hot-rolled complex-phase high-strength steel plate and a production method thereof. The production method comprises the steps of heating, hot rolling, cooling, coiling, annealing and acid pickling. The steel plate comprises, by weight percentage, 0.08-0.15% of C, 1.80-3.00% of Mn, less than or equal to 0.015% of S, less than or equal to 0.025% of P, 0.50-1.00% of Si, 0.020-0.060% of Als, 0.40-1.0% of Cr, 0.010-0.040% of Ti, 0.10-0.30% of Mo, less than or equal to 0.007% of N, and the balance Fe and inevitable impurities. According to the production method, a composition system is adopted through a reasonable composition design, complex-phase steel with different strength levels is produced by controlling different structure types in the hot rolling and annealing processes, and therefore the special requirement that a steel enterprise can meet the different performance of users by adopting one composition system can be met, the mechanical property of the whole-coil product is uniform, the baking hardening performance is good, and the requirements of the users for small-batch and different-strength-level samples can be met.

Description

technical field [0001] The invention relates to a high-strength steel plate and a production method thereof, in particular to a one-steel multi-stage hot-rolled multi-phase high-strength steel plate and a production method thereof. Background technique [0002] High-strength steel is divided into conventional high-strength steel (Conventional HSS) and advanced high-strength steel (AHSS); advanced high-strength steel, also known as advanced high-strength steel, its English abbreviation is AHSS (Advanced High Strength Steel); AHSS mainly includes dual-phase steel (DP), transformation-induced plasticity (TRIP) steels, martensitic (M) steels, complex-phase steels (CP), hot-formed (HF) steels and twinning-induced plasticity (TWIP) steels, etc. Advanced high-strength steel is a new type of steel that was gradually developed in the 1970s. Its strengthening method is obviously different from traditional high-strength steel. Traditional high-strength steel is mainly through solid sol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/06C22C38/28C22C38/22C22C38/38C21D8/02C21D1/26
CPCC21D1/26C21D8/0226C21D8/0273C21D2211/001C21D2211/002C21D2211/005C21D2211/008C22C38/001C22C38/002C22C38/02C22C38/06C22C38/22C22C38/28C22C38/38
Inventor 王健李梦英马德刚杜明山夏明生刘丽萍乔治明张军张春花冯晓勇李经哲吕浩李梦龙武冠华王永杰
Owner TANGSHAN IRON & STEEL GROUP
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