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Low-silicon titanium-containing pickling plate of 460MPa-level yield strength and preparation method thereof

A technology of yield strength and pickling plate, which is applied in the field of pickling plate and its preparation, can solve problems such as roll pitting, rising rolling force, and affecting the surface quality of strip steel, so as to achieve good processing performance, grain refinement, Effect of improving Ti utilization

Active Publication Date: 2017-07-21
MAGANG (GROUP) HOLDING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the hot rolling process, due to the recrystallization inhibitory effect of Nb, the rolling force of this steel type rises rapidly during the rolling process, and the damage to the roll is more obvious, resulting in pitting of the roll and affecting the strip after pickling. Surface Quality

Method used

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  • Low-silicon titanium-containing pickling plate of 460MPa-level yield strength and preparation method thereof
  • Low-silicon titanium-containing pickling plate of 460MPa-level yield strength and preparation method thereof
  • Low-silicon titanium-containing pickling plate of 460MPa-level yield strength and preparation method thereof

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Embodiment Construction

[0026] The present invention will be described in detail below in conjunction with accompanying drawing and embodiment

[0027] A low-silicon titanium-containing pickling plate with a yield strength of 460MPa, the chemical composition and weight percentage are: C0.06-0.09%, Mn 0.20-0.60%, Als 0.01-0.05%, Ti 0.025-0.06%, Si≤0.05 %, Nb≤0.010%, S≤0.010%, P≤0.020%, N≤0.004%, O≤0.003%, and the rest are iron and unavoidable impurities.

[0028] Prepared by the following steps:

[0029] Converter smelting - ladle blowing argon - LF furnace refining - RH vacuum treatment - continuous casting - hot continuous rolling - laminar cooling - coiling - into the continuous pickling line for pickling.

[0030]Among them, in the hot continuous rolling step, the exit temperature of the heating furnace is 1220-1250°C, and the soaking time is not less than 40 minutes; the finishing temperature of rough rolling is 1082-1095°C; The final rolling temperature is 840-900°C; rough rolling is rolled fo...

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Abstract

The invention discloses a low-silicon titanium-containing pickling plate of 460MPa-level yield strength and a preparation method thereof. The low-silicon titanium-containing pickling plate comprises chemical components including, by weight, 0.06-0.09% of C, 0.20-0.60% of Mn, 0.01-0.05% of Als, 0.025-0.06% of Ti, 0-0.05% of Si, 0-0.01% of Nb, 0-0.010% of S, 0-0.020% of P, 0-0.004% of N, 0-0.003% of O and the balance Fe and inevitable impurities. The preparation method comprises the steps of converter steel making, ladle argon blowing, LF furnace refining, RH vacuum treatment, continuous casting, hot continuous rolling, laminar cooling, coiling, and acid pickling through a continuous acid pickling line. The organization form of the low-silicon titanium-containing pickling plate is ferrite, a small amount of carbide and a small amount of pearlite, the grain size level is 11-12, the yield strength is 460-490MPa, the tensile strength is 565-585 MPa, the ductility is 22-25%, and the low-silicon titanium-containing pickling plate has the surface quality of strip steel of FB(02) level or over and great machining performance.

Description

technical field [0001] The invention relates to a pickling board and a preparation method thereof, in particular to a low-silicon titanium-containing pickling board with a yield strength of 460 MPa and a preparation method thereof. Background technique [0002] High-strength low-alloy automotive structural steels are generally designed with Nb microalloys and appropriate addition of Si components. In the hot rolling process, due to the recrystallization inhibitory effect of Nb, the rolling force of this steel type rises rapidly during the rolling process, and the damage to the roll is more obvious, resulting in pitting of the roll and affecting the strip after pickling. Surface Quality. The addition of Si element increases the viscosity of iron oxide scale on the surface of strip steel, which is difficult to remove, and longitudinal oxygen-compressed stripes appear along the rolling direction. Contents of the invention [0003] In order to solve the above-mentioned techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C38/04C22C38/06C22C38/02C22C38/12C22C33/04C23G1/08
CPCC22C33/04C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C23G1/08
Inventor 闻成才司小明游慧超谷海容
Owner MAGANG (GROUP) HOLDING CO LTD
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