Weld Stainless Steel Pipe TP304 Tp347 Tp347h for Transporting Fluids & Gases

• Customization: Available
• Type: Stainless Steel Pipes
• Standard: ASTM, AISI, GB, JIS, DIN, EN
• Model NO.: TP304 TP347 TP347H Weld Stainless Steel Pipe
• Grade: as Per Client′s Design
• Shape: Round/Customized
• Technique: Hot Rolled/Cold Drawn
• Surface Treatment: as Per Products
• Steel: ASME Sb - 163/ASME Sb338
• Process: Polished/Solution Treatment
• Condition: Hot Finished/Cold Finished
• End: Plain End/Bevel End
• Test: Et,Ut,PT,Ht
• Stock: Size Can Customized
• Processing: Customized
• Thickness: 1-150mm
• Length: as Per Client′s Design
• Used: Factory, Decoration, Food
• Packing: Standard Export Packing
• Delivery Time: 10-30 Working Days
• Size: as Per Client Design
• Selling Units: Single Item
• Name: Stainless Steel Pipe
• Transport Package: Woven Bag/Wooden Case
• Specification: SCH 5S-SCH160
• Trademark: EZS
• Origin: China
• Production Capacity: 10, 000, 000 Kgs/Year

Product Description

Product Description

  

TP304, TP347, and TP347H Weld Stainless Steel Pipes

1. Product Overview
 

TP304, TP347, and TP347H are austenitic stainless - steel grades widely utilized in the production of welded pipes. These pipes are highly regarded across diverse industries due to their excellent corrosion resistance, reliable mechanical properties, and adaptability to various operating conditions. The welding process employed in their manufacturing provides a cost - effective solution compared to seamless pipes in numerous applications.

2. Specifications

Specification	TP304	TP347	TP347H
Dimensions	Diameters typically range from 1/8" (suitable for small - scale instrumentation) to over 48" for large - scale industrial pipelines. Wall thicknesses vary significantly, with thin - walled options around 0.065" for low - pressure systems and thick - walled options up to 1" or more for high - pressure and high - temperature scenarios.	Offers a wide spectrum of diameters, similar to TP304, catering to different application needs. Wall thicknesses are also diverse, selected based on factors such as pressure, temperature, and fluid characteristics.	Diameters and wall thicknesses are engineered to meet the demands of high - temperature and high - pressure applications. Sizing takes into account the material's unique properties and the expected service life of the pipe, with options available for both small - and large - scale installations.
Pressure Ratings	Can withstand pressures ranging from relatively low values (e.g., a few dozen psi in low - pressure, low - temperature applications) to several hundred psi or higher, depending on diameter, wall thickness, and temperature. For example, a standard - sized TP304 welded pipe with a certain wall thickness may have a pressure rating of 1500 - 2500 psi at room temperature.	Capable of handling significant pressures, with the rating determined by the pipe's dimensions and the material properties of TP347. It can withstand pressures comparable to or slightly higher than TP304 in some applications, especially those with moderate - temperature requirements.	Specifically designed for extreme high - temperature and high - pressure applications, TP347H pipes can endure extremely high pressures. The pressure rating is optimized according to the material's high - temperature performance and the requirements of industrial processes.
Pipe Type	Welded construction is achieved through processes such as electric resistance welding (ERW), tungsten inert gas (TIG) welding, or metal inert gas (MIG) welding. The welding process is carefully controlled to ensure a strong and leak - tight joint.	Welded pipes of TP347 are fabricated using appropriate welding techniques. The welding method is chosen based on application requirements and the material's characteristics to maintain the integrity of the niobium - stabilized structure.	Welded TP347H pipes require specialized welding procedures due to their high - temperature application requirements. High - precision welding methods are employed to ensure the pipe can withstand harsh operating conditions while maintaining the integrity of the niobium - stabilized structure.

 

 

 

 

 

3. Material Properties

3.1 Chemical Composition

Element	TP304	TP347	TP347H
Carbon (C)	≤0.08	≤0.08	0.04 - 0.10
Chromium (Cr)	18.0 - 20.0	17.0 - 19.0	17.0 - 19.0
Nickel (Ni)	8.0 - 10.5	9.0 - 13.0	9.0 - 13.0
Niobium (Nb)	-	10 x C - 1.10	10 x C - 1.10

 

 

 

 

 

3.2 Mechanical Properties

Property	TP304	TP347	TP347H
Tensile Strength	515 - 795 MPa	515 - 795 MPa	515 - 795 MPa
Yield Strength	≥205 MPa	≥205 MPa	≥205 MPa
Elongation	≥40%	≥35%	≥35%

 

 

 

 

 

• TP304: A widely used austenitic stainless steel, TP304 offers good general corrosion resistance attributed to its chromium and nickel content. The relatively low carbon content helps prevent carbide precipitation to some extent, maintaining corrosion resistance in welded joints.

• TP347: Niobium in TP347 stabilizes the carbon in the steel, preventing carbide precipitation and enhancing the pipe's resistance to intergranular corrosion. This makes TP347 suitable for applications where exposure to elevated temperatures could otherwise cause intergranular corrosion in other stainless - steel grades.

• TP347H: The "H" grade in TP347H indicates a higher carbon content. This, combined with the niobium - stabilization, further boosts the high - temperature strength of the material. TP347H is well - suited for applications with extremely high - temperature and high - pressure conditions

4. Applications

Industry	TP304	TP347	TP347H
Food and Beverage	Used for transporting food - grade fluids such as water, milk, juices, and beer. Its smooth surface and corrosion resistance ensure easy cleaning and product purity.	Can be used in high - temperature food - processing applications where long - term exposure to elevated temperatures is involved, such as in continuous baking or frying processes in large - scale food production.	Ideal for high - temperature food - processing applications with long - term exposure to elevated temperatures, like continuous baking or frying processes in large - scale food production, where its enhanced high - temperature strength is beneficial.
Pharmaceutical	Ideal for transporting pharmaceutical ingredients, process fluids, and purified water, meeting the strict cleanliness and quality requirements of the pharmaceutical manufacturing process.	Suited for pharmaceutical applications where high - temperature resistance and resistance to intergranular corrosion are important, such as in certain chemical - reaction vessels during pharmaceutical production.	Well - suited for pharmaceutical applications with high - temperature and high - pressure requirements, such as in some high - temperature sterilization processes or chemical - reaction vessels where extreme conditions are present.
Chemical	Suitable for transporting non - highly aggressive chemicals, including mild acids, alkalis, and some organic solvents. However, its corrosion resistance may be limited in highly corrosive chemical environments.	Due to its niobium - stabilized structure, used in chemical applications involving high - temperature and corrosive conditions, such as in the production of certain polymers or in the handling of chemicals that could cause intergranular corrosion in other stainless - steel grades.	Used in chemical applications with extremely high - temperature and high - pressure conditions, such as in high - temperature reactors or pipelines carrying corrosive chemicals at high pressures.
Power Generation	Can be used in non - critical cooling water systems in power plants, withstanding normal corrosion from water and additives.	Used in high - temperature sections of power - generation equipment, such as in the piping systems for hot steam, where its resistance to high - temperature oxidation and intergranular corrosion is crucial for reliable operation.	Similar to TP347, but due to its higher carbon content, more suitable for extremely high - temperature applications in power - generation, such as in the hottest sections of boilers or superheaters.
Oil and Gas	Used in some onshore applications for transporting non - corrosive or mildly corrosive fluids and gases, such as in certain natural gas pipelines.	Finds application in the oil and gas industry, particularly in high - temperature and corrosive environments, like pipelines transporting fluids with high sulfur content or in equipment used in oil - well downhole applications where high - temperature resistance is required.	Employed in the oil and gas industry for applications with severe high - temperature and high - pressure conditions, such as in deep - well oil and gas extraction, where it can better handle the harsh environment.

 

 

 

 

 

5. Manufacturing Process

5.1 Sheet Preparation

• TP304/TP347/TP347H: High - quality stainless - steel sheets of the appropriate grade (TP304, TP347, or TP347H) are selected. The sheets are cut to the required width and length according to the pipe dimensions. The edges of the sheets are prepared for welding, often involving bevelling to ensure a proper weld joint.

5.2 Forming

• TP304/TP347/TP347H: The sheets are formed into a tubular shape, usually by bending and rolling. The formed tube is then tack - welded to hold its shape before the final welding process. Precise control during forming ensures the dimensional accuracy of the tube.

5.3 Welding

• TP304: Different welding methods can be used. ERW is often used for high - volume production of thin - walled TP304 pipes, while TIG welding may be preferred for high - quality, small - diameter pipes requiring a precise and clean weld. MIG welding can also be an option, depending on factors like sheet thickness, weld quality requirements, and cost.

• TP347: High - precision welding methods such as TIG welding are often employed for TP347 to ensure the proper formation of niobium - carbon compounds and to maintain the material's corrosion resistance and mechanical properties. The welding parameters are adjusted according to the material's characteristics.

• TP347H: Due to its high - temperature application requirements and niobium - stabilized structure, specialized welding procedures are crucial for TP347H. TIG welding or other advanced welding techniques are used to ensure the pipe can withstand harsh operating conditions while maintaining the integrity of the niobium - carbon compounds.

5.4 Post - Weld Heat Treatment (PWHT)

• TP304: In some cases, especially for thick - walled pipes or when significant residual stress is introduced during welding, PWHT is applied. It helps relieve stress, improve the mechanical properties of the weld area, and enhance the pipe's corrosion resistance.

• TP347: PWHT is important for TP347 pipes to ensure the proper formation of niobium - carbon compounds and to relieve stress. The heat treatment process is carefully designed to meet the specific requirements of the material and the application.

• TP347H: For TP347H pipes, PWHT is crucial. The heat treatment process is precisely controlled to optimize the formation of niobium - carbon compounds and to improve the high - temperature strength and corrosion resistance of the welded joint, considering the higher carbon content and extreme application conditions.

5.5 Surface Treatment

• TP304/TP347/TP347H: All three grades of pipes may undergo surface treatment. Pickling, involving immersion in a mixture of nitric and hydrofluoric acids, removes oxide layers, scale, and impurities from the surface, exposing the fresh, corrosion - resistant surface of the stainless steel and enhancing overall corrosion resistance. Passivation, using a solution, forms a thin, protective oxide film on the surface, further improving corrosion resistance.

 

 

 

 

Detailed Photos

 

 

Processing of Production