Manufacturing method of ultra low temperature and high intensity fine grain simple steel flange

A high-strength steel and fine-grained technology, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problems of increased cost and high price, and achieve the effect of uniform structure, high strength, and improved comprehensive performance

Active Publication Date: 2008-09-03
JIANGYIN HENGRUN HEAVY IND
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Problems solved by technology

However, Ni is a precious metal. Our country has few resources and the price is very high. The use of Ni-containing alloy steel will greatly increase the cost

Method used

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Embodiment Construction

[0026] The manufacturing method of the micro-alloyed fine-grained low-carbon steel flange with ultra-low temperature and high-strength performance in the present invention is made of low-carbon micro-alloyed fine-grained high-strength steel through forging and heat treatment processes.

[0027] The composition weight percent of each chemical element in the low-carbon microalloy fine-grained high-strength steel is: C 0.12-0.18%, Si 0.15-0.35%, Mn 1.2-1.6%, trace elements V 0.02-0.06%, Al 0.025% ~0.040%, N0.001~0.002%, the balance is Fe and unavoidable impurities.

[0028] The process flow of the method includes: temperature-controlled forging, heat treatment of semi-finished products, and cutting of finished products. The specific process steps are as follows:

[0029] Step 1: Temperature-controlled forging

[0030] The forging start temperature is 1050±20°C, the forging end temperature is 900°C±20°C, air cooling after forging,

[0031] Step 2: Heat treatment of semi-finished...

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PUM

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Abstract

The invention relates to the manufacture method of micro-alloy fine-grain low-carbon steel flange with ultralow temperature and high strength performance, which can manufacture micro-alloy fine-grain low-carbon steel flange from low-carbon micro-alloy fine-grain high-strength steel by forging and heat treatment processes. The steel contains following chemical components (by weight percentage): C 0.12 to 0.18%, Si 0.15 to 0.35%, Mn 1.2 to 1.6%, and trace elements V 0.02 to 0.06%, Al 0.025 to 0.040%, N 0.001 to 0.002%, Fe in balance, and inevitable impurities. The method comprises the following steps: temperature-controlled forging, heat treatment of semi-product and cutting of final product, wherein the beginning temperature of forging is 1,050 DEG C plus or minus 20 DEG C, the final temperature of forging is 900 DEG C plus or minus 20 DEG C, and the semi-product is air-cooled after forging; the heat treatment of the semi-product is executed by adopting quenching and high-temperature tempering process; and a workpiece is subjected to metal cutting after the heat treatment. The method of the invention can obviate the use of expensive Ni alloy steel, and can meet the requirement for -50 DEG C low-temperature toughness and high strength.

Description

technical field [0001] The invention relates to a method for manufacturing a carbon steel flange. In particular, it relates to a method for manufacturing an ultra-low temperature, high-strength fine-grained carbon steel flange. Carbon steel flanges are used in petroleum, natural gas, chemical industry, shipbuilding and various pipeline projects. It belongs to the field of metal material processing and heat treatment. Background technique [0002] With the development of the economy, the demand for energy in countries around the world is increasing, the consumption of oil and natural gas is increasing rapidly, and related industries such as oil and natural gas exploration, drilling, transportation, and processing are developing rapidly. A large number of pressure-bearing parts such as flanges are used in these industries. According to the requirements of working conditions (such as in the northeast and northwest regions), they need to have good plasticity and toughness (tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00C22C38/12C21D9/00B21J5/00B21J1/06
Inventor 承立新卞建军
Owner JIANGYIN HENGRUN HEAVY IND
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