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Low-manganese and low-silicon micro-titanium alloyed Q355B structural steel plate and production method thereof

A technology of Q355B and structural steel plates, applied in metal rolling, metal rolling, metal processing equipment, etc., can solve the problems of long cooling time, unfavorable high-efficiency production, etc., to reduce alloy cost, reduce cost, and increase carbon element content Effect

Inactive Publication Date: 2021-06-25
CHONGQING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production of steel plates in this invention requires stacking and slow cooling, and stacking and slow cooling requires a special site, and the cooling time is long, which is not conducive to high-efficiency production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A low-manganese and low-silicon micro-titanium alloyed Q355B structural steel plate, with a thickness of 20 mm, and its chemical composition by mass fraction is: C0.22%, Si 0.12%, Mn 0.68%, P 0.020%, S 0.002%, Als 0.030%, Ti 0.043%, the rest is Fe and impurities. Its production method is:

[0041] (1) Heating process: the heating coefficient is 12min / cm, and the furnace temperature is 1118°C.

[0042](2) Rolling process: two-stage controlled rolling is adopted, the rolling end temperature of the first stage is 968°C, the rolling start temperature of the second stage is 891°C, and the final rolling temperature is 848°C.

[0043] (3) Cooling process: water cooling method is adopted, and the temperature of returning to red is 689°C.

[0044] After testing, the mechanical properties of the 20mm Q355B steel plate produced in this example are: upper yield strength 425MPa; tensile strength 544MPa; elongation after fracture 26%; longitudinal 20°C KV2: 98, 84, 93J.

Embodiment 2

[0046] A low-manganese and low-silicon micro-titanium alloyed Q355B structural steel plate, with a thickness of 35 mm, and its chemical composition by mass fraction is: C0.22%, Si 0.18%, Mn 0.74%, P 0.020%, S 0.003%, Als 0.036%, Ti 0.050%, the rest is Fe and impurities. Its production method is:

[0047] (1) Heating process: the heating coefficient is 8.3min / cm, and the furnace temperature is 1061°C.

[0048] (2) Rolling process: Two-stage controlled rolling is adopted, the rolling end temperature of the first stage is 961°C, the rolling start temperature of the second stage is 882°C, and the final rolling temperature is 852°C.

[0049] (3) Cooling process: water cooling method is adopted, and the temperature of returning to red is 689°C.

[0050] After testing, the mechanical properties of the 35mm Q355B steel plate produced in this example are: upper yield strength 390MPa; tensile strength 518MPa; elongation after fracture 24.5%; longitudinal 20°C KV2: 143, 144, 145J.

Embodiment 3

[0052] A low-manganese and low-silicon micro-titanium alloyed Q355B structural steel plate with a thickness of 30mm, and its chemical composition by mass fraction is: C0.22%, Si 0.18%, Mn 0.74%, P 0.030%, S 0.010%, Als 0.040%, Ti 0.050%, the rest is Fe and impurities. Its production method is:

[0053] (1) Heating process: the heating coefficient is 8.3min / cm, and the furnace temperature is 1074°C.

[0054] (2) Rolling process: two-stage controlled rolling is adopted, the rolling end temperature of the first stage is 974°C, the rolling start temperature of the second stage is 881°C, and the final rolling temperature is 838°C.

[0055] (3) Cooling process: water cooling method is adopted, and the temperature of returning to red is 687°C.

[0056] After testing, the mechanical properties of the 30mm Q355B steel plate produced in this example are: upper yield strength 399MPa; tensile strength 545MPa; elongation after fracture 23.5%; longitudinal 20°C KV2: 144, 143, 138J.

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Abstract

The invention belongs to the technical field of production of steel plates and particularly discloses a low-manganese and low-silicon micro-titanium alloyed Q355B structural steel plate and a production method thereof. The steel plate comprises the following chemical components in percentage by mass: 0.20-0.24% of C, 0.10-0.20% of Si, 0.60-0.75% of Mn, less than or equal to 0.030% of P, less than or equal to 0.030% of S, 0.015-0.040% of Als, 0.035-0.055% of Ti and the balance of Fe and impurities. According to the low-manganese and low-silicon micro-titanium alloyed Q355B structural steel plate and the production method thereof, the content of carbon is increased, the contents of manganese and silicon are reduced, the performance of the steel plate is ensured, and the alloy cost is reduced, so that low-cost production of the Q355B steel plate is achieved. Compared with the steel plate mentioned in the background art, the cost of per ton of steel is reduced by about 28 yuan.

Description

technical field [0001] The invention relates to the technical field of steel plate production, in particular to a low-manganese, low-silicon and micro-titanium alloyed Q355B structural steel plate and a production method thereof. Background technique [0002] Q355B low-alloy steel plate implements the GB / T 1591-2018 standard, and Q355B replaces the Q345B steel plate in GB / T 1591-2008. This steel plate has high strength and plastic toughness, and is widely used in building structures and other fields. One of the steel grades mass-produced by enterprises, the demand accounts for more than 50% of the output of low-alloy steel plates. At present, the profit margin of this type of conventional steel plate is shrinking. In order to improve market competitiveness and improve enterprise efficiency, it is urgent to develop a low-cost production process under the premise of ensuring product quality. [0003] At present, in terms of medium and thick plate products, there are already m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/14B21B1/38B21B37/74B21B45/00
CPCB21B1/38B21B37/74B21B45/004B21B2001/386C22C38/002C22C38/02C22C38/04C22C38/06C22C38/14
Inventor 姜颖章远杰黄微涛廖明罗智向浪涛张创举李宏伟王昕徐华刘金花代建平
Owner CHONGQING IRON & STEEL CO LTD
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