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tc128grb steel plate for oil tanker and its production method

A production method and steel plate technology, which is applied in the field of steel for tank cars, can solve the problems of difficult production and high price, and achieve the effects of low production cost, good welding performance, and good low-temperature toughness

Active Publication Date: 2016-08-24
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing TC128GrB steel plate has the disadvantages of high difficulty in production, high price and only guarantee of transverse impact energy at -20°C

Method used

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  • tc128grb steel plate for oil tanker and its production method
  • tc128grb steel plate for oil tanker and its production method
  • tc128grb steel plate for oil tanker and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: The TC128GrB steel plate for the oil tanker is produced by the following method.

[0021] (1) The chemical composition (weight) of the billet is: C 0.15%, Si 0.15%, Mn 1.65%, P 0.012%, S 0.002%, Cu 0.25%, V 0.095%, Nb 0.006%, Ti 0.016%, Al 0.032 %, Cev 0.46%, the balance is Fe and unavoidable inclusions. In order to avoid cracking on the surface of low-alloy high-strength billets, the billets are required to be stacked for more than 24 hours to release stress.

[0022] (2) The TC128GrB steel plate for the oil tanker is produced by the following process steps:

[0023] A. Heating process: steel billets are stacked for 30 hours before being loaded into the furnace; low temperature and slow heating, the maximum heating temperature is 1250°C, to ensure that the billets are evenly burned through, and the heating speed is 1.5min / mm (calculated as 1.5 minutes per millimeter thickness of steel plate) , The temperature in the soaking section is 1220℃~1240℃, and t...

Embodiment 2

[0032] Embodiment 2: The TC128GrB steel plate for the oil tanker is produced by the following method.

[0033] (1) The chemical composition (weight) of the billet is: C 0.16%, Si 0.37%, Mn 1.55%, P 0.011%, S 0.004%, Cu 0.18%, V 0.070%, Nb 0.017%, Ti 0.011%, Al 0.020 %, Cev 0.44%, the balance is Fe and unavoidable inclusions. In order to avoid cracking on the surface of low-alloy high-strength billets, the billets are required to be stacked for more than 24 hours to release stress.

[0034] (2) The TC128GrB steel plate for the oil tanker is produced by the following process steps:

[0035] A. Heating process: billets are loaded into the furnace after being stacked for 30 hours; low temperature and slow heating, the maximum heating temperature is 1245°C, to ensure that the billets are evenly burned through, the heating speed is 2.0min / mm, the temperature of the soaking section is 1220°C ~ 1230°C, The heating time of the hot section is 100 minutes to ensure that the ingot is even...

Embodiment 3

[0043] Embodiment 3: The TC128GrB steel plate for the oil tanker is produced by the following method.

[0044] (1) The chemical composition (weight) of the billet is: C 0.23%, Si 0.40%, Mn 1.32%, P 0.008%, S 0.005%, Cu 0.05%, V 0.065%, Nb 0.010%, Ti 0.002%, Al 0.021 %, Cev 0.48%, the balance is Fe and unavoidable inclusions. In order to avoid cracking on the surface of low-alloy high-strength billets, the billets are required to be stacked for more than 24 hours to release stress.

[0045] (2) The TC128GrB steel plate for the oil tanker is produced by the following process steps:

[0046] A. Heating process: billets are stacked for 30 hours before being loaded into the furnace; low temperature and slow heating, the maximum heating temperature is 1250°C, to ensure that the billets are evenly burned through, the heating speed is 1.0min / mm, the temperature of the soaking section is 1230°C ~ 1240°C, The heating time of the hot section is 150 minutes to ensure that the ingot is e...

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Abstract

The invention discloses a TC128GrB steel plate for an oil bath tank truck and a production method of the TC128GrB steel plate. The TC128GrB steel plate comprises the following components in percentage by weight: 0.14%-0.24% of C, 0.15%-0.50% of Si, 1.30%-1.65% of Mn, no more than 0.015% of P, no more than 0.005% of S, no more than 0.30% of Cu, 0.020%-0.10% of V, 0.005%-0.020% of Nb, no more than 0.020% of Ti, 0.020%-0.050% of Al, no more than 0.53% of Cev, and the balance of Fe and inevitable impurities, wherein Cev=C+Mn / 6+(Cr+Mo+V) / 5 +(Ni+Cu) / 15. The TC128GrB steel plate is high in carbon content, relatively low in microalloy content and low in cost; the strength and toughness are matched; the mechanical property of the steel plate can completely meet the standard requirements of steel for the tank truck on TC128GrB steel; and the TC128GrB steel plate has high surplus, and is low in added precious metal content, and low in production cost.

Description

technical field [0001] The invention relates to a steel for tank cars, in particular to a TC128GrB steel plate for tank cars and a production method thereof. Background technique [0002] Since the 1960s, most of the steel used for the tank body of liquefied gas tankers in my country is Q345R steel with a lower strength level (tensile strength Rm is 500MPa), resulting in a thicker tank wall thickness, resulting in the existing The tank car has a large weight coefficient, a small volume-to-weight ratio, and low carrying efficiency, which limits the large-scale (high parameter) development of domestic liquefied gas tank cars. Compared with advanced foreign countries, the self-weight coefficient of my country's tank trucks is about 30% higher than that of advanced countries such as Japan, Europe and the United States. Therefore, thinning, reducing the weight of the tank body and increasing the strength of the steel plate are a direction for the development of tank cars in our c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/16C22C38/14C22C38/12C22C33/04C21D8/00
Inventor 刘丹刘利香
Owner WUYANG IRON & STEEL
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