What is a seamless steel pipe for three chemicals

What is a seamless steel pipe for three chemicals?

Seamless steel pipe used in petroleum, petrochemical and chemical industries(contain coal chemical industry) what say normally namely 3 change use seamless steel pipe, point to petroleum chemical industry commonly, include petroleum refining to change, chemical fiber production, coal chemical industry, chemical industry, chemical fertilizer production uses steel pipe aggregate. According to the production mode of steel pipe, it is divided into seamless steel pipe and welded pipe. Can be divided into carbon steel pipe, alloy steel pipe and stainless steel pipe by steel, and the compound steel pipe widely used in recent years. Because the main physical and chemical reactions in the process of chemical production are carried out under specific pressure and temperature. Raw materials, reaction processes and outputs have temperature and pressure requirements, and raw materials, reaction processes and outputs are corrosive to a certain extent. Therefore, there are certain technical requirements for the steel pipes used in special chemical production.

20211004220251 19063 - What is a seamless steel pipe for three chemicals

Cracking pipe is used for oil refinery furnace pipe, heat exchanger and connecting pipe, is one of the earliest varieties of seamless steel pipe developed in China, the current technical standard of cracking pipe see GB9948-2006.
Chemical fertilizer special pipe is used for chemical fertilizer, chemical plant equipment and pipe with working temperature of -40-400℃ and working pressure of 10-30mpa. The current technical standard of chemical pipe is gb6479-2000.
In addition to the above two special standards, the three chemical industry also uses a large number of ordinary steel pipe, liquefied transportation steel pipe, low and medium pressure boiler pipe, high pressure boiler pipe, alloy steel pipe, stainless steel pipe, titanium alloy pipe, composite pipe, etc.

Requirements for steel properties of three chemical pressure devices

In the petrochemical industry, the operating conditions of containers are mostly not normal temperature and pressure, that is, the operating pressure is higher or lower than atmospheric pressure; Operating temperature higher or lower than normal temperature; The operating media of containers are mostly flammable, explosive, and even toxic and corrosive. Moreover, with the continuous increase of the depth of petroleum processing and the development of petrochemical industry, the operating conditions of refinery equipment will be more and more demanding, which means that the pressure vessel and pipeline materials are more and more demanding. It mainly includes: high working temperature strength, enough creep strength and durable strength, good toughness, structure stability, low notch sensitivity, good low-fold structure, good processing and welding performance, etc.

Table 1 Common piping materials and temperature range

The serial number

Standard name of steel pipe

Steel pipe standard no.

The name of the material

Outer or nominal diameter

(mm)

The use of temperature

(℃)

note

1

Seamless steel pipes for conveying fluids

GB/T8163

10 #

6-630.

– 20-425

2

Seamless steel pipes for petroleum cracking

GB9948

10 # / # 20

10-273.

– 20-425

3

High pressure seamless steel pipe for fertilizer equipment

GB6479

10#

14-273.

– 40-400

Working pressure 10-320mpa

4

Seamless steel pipes for conveying fluids

GB/T8163

20 #, 16 mn

6-630.

– 20-425

5

High pressure seamless steel pipe for fertilizer equipment

GB6479

16Mn

14-273.

– 40-400

6

High pressure seamless steel pipe for fertilizer equipment

GB6479

16MnD

14– 273.

– 40-250

7

High pressure seamless steel pipe for fertilizer equipment

GB6479

19Mn2VD

14– 273.

– 50-100

8

High pressure seamless steel pipe for fertilizer equipment

GB6479

19Mn2NiD

14– 273.

– 70-100

9

Seamless steel pipes for petroleum cracking

GB9948

12CrMo

10-273.

525 or less

10

High pressure seamless steel pipe for fertilizer equipment

GB6479

12CrMo

14-273.

525 or less

11

Seamless steel pipes for petroleum cracking

GB9948

15CrMo

10-273.

550 or less

12

High pressure seamless steel pipe for fertilizer equipment

GB6479

15CrMo

14-273.

550 or less

13

Seamless steel pipes for high pressure boilers

GB5310

12Cr1MoVG

10-530.

575 or less

14

High pressure seamless steel pipe for fertilizer equipment

GB6479

12Cr2Mo

14-273.

575 or less

15

High pressure seamless steel pipe for fertilizer equipment

GB6479

1Cr5Mo

14-273.

600 or less

16

Seamless steel pipes for petroleum cracking

GB9948

1Cr5Mo

10-273.

550 or less

Steel pipes and varieties commonly used in chemical plants

Cracking pipe is used for oil refinery furnace pipe, heat exchange and connection pipe, is one of the earliest varieties of seamless steel pipe developed in China, the current technical standard of cracking pipe see GB9948-2006.
Chemical fertilizer special pipe is used for chemical fertilizer, chemical plant equipment and pipe with working temperature of -40-400℃ and working pressure of 10-30mpa. The current technical standard of chemical pipe is gb6479-2000.
In addition to the above two special standards, the three chemical industry also uses a large number of ordinary steel pipe, liquefied transportation steel pipe, low and medium pressure boiler pipe, high pressure boiler pipe, alloy steel pipe, stainless steel pipe, titanium alloy pipe, composite pipe and low temperature resistance pipe.
The development of medium pressure hydrocracking technology with operating pressure of 6-10.0mpa has been very active since 1980s. With the improvement of environmental protection requirements, the demand for hydrocracking units is increasing in recent years, such as hydrocracking, benzene hydrogenation, kerosene hydrogenation, gasoline, diesel oil hydrogenation and lubricating oil hydrogenation units, etc. Hydrocracking technology is playing an increasingly important role in refining and chemical industry.
China’s energy resources are characterized by rich coal and less oil. By using China’s rich coal resources, coal liquefaction technology is used to convert coal into high-quality liquid fuel, or directly gasification to make coal into gas. It is an effective way to utilize thermal coal especially high sulfur coal in our country. Direct coal liquefaction is a hydrogenation process under high pressure and high temperature, so the process equipment and materials must be resistant to high pressure and hydrogen corrosion under critical hydrogen conditions.
In short, the scope of the steel pipe used in the chemical plant is very wide, and the requirements are also very diverse. Therefore, as a steel pipe manufacturer, it should be further close to the market, understand the needs of users, according to the user’s use environment rather than sticking to the requirements of the standard, targeted development of the most suitable steel pipe users need.
The most commonly used types of steel pipes in pressure vessels are:

Carbon steel

Carbon structural steel and high quality carbon steel are often used in pressure vessels. In the national standard GB699-88 “Technical Conditions for High quality Carbon Structural Steel”, high quality carbon steel is divided into steel numbers according to the content and manganese content. Pressure vessels are commonly used for 20R, 16MnR, 10, 20 seamless steel pipes.

Alloy steel

According to the content of alloying elements, it can be divided into low alloy steel, medium alloy steel and high alloy steel.

Low alloy steel

Low alloy steel is an alloy steel with a certain amount of alloying elements added to carbon steel. The total content of alloying elements is generally not more than 5% to improve the strength of steel and ensure a certain plasticity and toughness, or to make the steel has some special properties, such as low temperature resistance, high temperature resistance, hydrogen resistance or corrosion resistance.
1) Low temperature steel
Low temperature steel is mainly used for air separation equipment and liquefied petroleum gas storage and transportation equipment such as all kinds of cryogenic vessels and metal structure of cold area, so the demand is high, the low temperature toughness of steel is generally through solid solution strengthening, refine the grain size of alloy element, and through the normalizing and tempering processing fine grains, homogenization, and obtain good toughness at low temperature. Alloy steel commonly used for low temperature pressure vessels are 16MnDR, 15MnNiDR, 09Mn2VDR, 09MnNiDR and so on.
2) Heat resistant steel
Pressure vessels commonly used low alloy heat resistant steel 1Cr-0.5Mo (15CrMo), 11/4Cr-0.5Mo, 21/4CR-1Mo, 3CR-1Mo and so on. The Cr and Mo alloying elements and carbide-forming elements such as vanadium, niobium, titanium, tungsten and boron contained in these alloy steels are also the basic elements that significantly improve the hydrogen resistance of steels, so the low alloy heat resistant steels mentioned above can also be used as hydrogen resistant steels.

Medium alloy steel

Alloy steels with a total alloying element content of 5-12% are referred to as medium alloy steels. Pressure vessels are rarely or even basically not used, only used in piping and heating furnace pipe, mainly cr5-Mo and Cr9-Mo and other steel.

High alloy steel

Alloy steels with a total alloying element content greater than 13% are called high alloy steels. According to the structure of its supply state, it is divided into ferrite, martensite, austenite and austenite + ferrite duplex steel. The most widely used of these steels are Cr or CR-Ni steels. Because it contains higher Cr or Cr-Ni alloy elements, it has corrosion resistance to the atmosphere and various corrosive media, so it is also known as stainless steel. Pressure vessels and its internal parts commonly used steel numbers are 0Cr13, 1 Cr13, 2Cr13, 0Cr18Ni9, 00Cr19Ni10, 0Cr18Ni10Ti, 0Cr17Ni12Mo2, 00Cr17Ni14Mo2, 0Cr18Ni12Mo2 Ti, 0Cr19Ni13Mo3, 00Cr19Ni13Mo3, etc.

Market analysis of large diameter thick wall steel pipe used in petrochemical industry

Large diameter thick wall seamless steel pipe for high pressure hydrocracking project

Since the 1980s, the development of medium pressure hydrocracking technology at operating pressures of 6-10.0mpa has been very active. With the improvement of environmental protection requirements, the demand for hydrocracking units is increasing in recent years, such as hydrocracking, kerosene hydrogenation, gasoline, diesel oil hydrogenation and lubricating oil hydrogenation units, etc. Hydrocracking technology is playing an increasingly important role in the refining industry.
According to the introduction of Beijing Design and Research Institute, a 1.2 million tons/year hydrocracking device, the design pressure is 10.0mpa, with about 600 tons of seamless steel pipe, which needs to use large diameter thick wall seamless steel pipe piping about 100 tons, its maximum wall thickness 400mm, maximum diameter 600mm.

Large diameter thick wall seamless steel pipe for ethylene project

In the petrochemical industry, ethylene plant seamless pipe consumption is the largest, wall thickness up to 90mm. A typical 900,000 ton ethylene plant needs about 40,000 tons of PIPE ∮18-610.
The consumption of seamless pipe in 900,000 tons/year ethylene plant is about 3,000 tons. At present, many ethylene plants in China are expanding to 900,000 tons. Design along with the increasingly development of ultra-high pressure technology, increasingly large scale, especially the method of pipe type production the development of ehv ethylene plant, the requirements of the ultrahigh pressure, large diameter thick wall seamless steel pipe diameter is bigger and bigger, so from the research situation analysis, in the petrochemical industry, ethylene plant in the next few years the number of large diameter thick wall seamless steel pipe need to consume every year about 20000 tons.

Large diameter thick wall seamless steel pipe for coal liquefaction

China’s energy resources are characterized by rich oil and less coal. It is an effective way to utilize thermal coal, especially high-sulfur coal, by utilizing China’s abundant coal resources and using coal liquefaction technology to transform coal into high-quality liquid fuel.
Direct coal liquefaction is a hydrogenation process under high pressure and high temperature, so the process equipment and materials must be resistant to high pressure and hydrogen corrosion under critical hydrogen conditions. In addition, the materials for direct liquefaction treatment contain solid particles such as coal and catalyst, so it is necessary to solve the technical problems such as deposition, wear and sealing caused by the treatment of particles. The slurry phase separation and residue in the conveying pipe can be inhibited by inclined conveying with large diameter seamless steel pipe. The wall thickness of seamless steel pipe can be as high as 105mm.

Source: China Seamless Steel Pipes Manufacturer – Yaang Pipe Industry Co., Limited (www.ugsteelmill.com)

(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)

If you want to have more information about the article or you want to share your opinion with us, contact us at sales@ugsteelmill.com

Please notice that you might be interested in the other technical articles we’ve published:

Summary
what is a seamless steel pipe for three chemicals - What is a seamless steel pipe for three chemicals
Article Name
What is a seamless steel pipe for three chemicals
Description
Seamless steel pipe used in petroleum, petrochemical and chemical industries(contain coal chemical industry).
Author
Publisher Name
www.ugsteelmill.com
Publisher Logo

Related News

العربيةБългарски简体中文繁體中文DanskNederlandsEnglishFrançaisDeutschBahasa IndonesiaItaliano日本語한국어LatinPortuguêsРусскийEspañolதமிழ்ไทยTürkçe