ASTM A333 Welded Pipe Carbon Steel Low Temperature Tubes Gr. 1/Gr. 2/Gr. 3/Gr. 4/Gr. 5/Gr. 6

• Customization: Available
• Application: Cast Iron, Chemical Processing, Construction, Oil and Gas, Water Supply, Building Material
• Pipe Diameter: 1/8"-5"
• Model NO.: ASTM A333 Welded Carbon Steel Pipe
• Pipe Length: Max 50m
• Surface Finish: Black
• Steel Grade: A333 Gr. 1/3/4/6/7/8/9
• Material: Carbon Steel
• Shape: Round/Customized
• Process: Hot Rolled/Cold Drawn
• Tolerance: ±5%
• End: Plain End/Bevel End
• Usage: Heat Transfer
• Test: BV, SGS Is Available
• Stock: Size Can Customized
• Processing: Customized
• Thickness: 1-150mm
• Used: Factory, Decoration, Food
• Packing: Standard Export Packing
• Delivery Time: 10-30 Working Days
• Size: 1/4"-4"
• Transport Package: Woven Bag/Wooden Case
• Specification: SCH 5S-SCH160
• Trademark: EZS
• Origin: China
• Production Capacity: 10000 Ton/Year

Product Description

Product Description

ASTM A333 Welded Carbon Steel Pipe

Category	Details
Standard	ASTM A333 - Standard Specification for Seamless and Welded Steel Pipe for Low-Temperature Service.
Material Type	Welded Carbon Steel (Electric-Resistance Welded (ERW) or Submerged Arc Welded (SAW)).
Grades	Grade 6 (Carbon Steel) - Other grades (e.g., 3, 4, 7, 8, 9, 10, 11) are alloy steels.
Chemical Composition	Grade 6: - Carbon (C): ≤0.30% - Manganese (Mn): 0.29-1.06% - Phosphorus (P): ≤0.025% - Sulfur (S): ≤0.025% - Silicon (Si): ≥0.10%
Mechanical Properties	- Tensile Strength: ≥415 MPa (60,200 psi) - Yield Strength: ≥240 MPa (35,000 psi) - Elongation (%): ≥30% (50 mm gauge length)
Impact Testing	Charpy V-Notch Test required at -45°F (-43°C) for Grade 6 to ensure low-temperature toughness.
Manufacturing Process	- Welded via ERW or SAW. - Heat treatment (normalizing or stress-relieving) may be applied post-welding.
Testing Requirements	- Hydrostatic Test: Mandatory. - Non-Destructive Testing (NDT): Radiography or ultrasonic testing. - Flattening Test for welded seams.
Temperature Range	Designed for low-temperature service (down to -45°F/-43°C for Grade 6).
Key Applications	- Cryogenic fluid transport (LNG, liquid nitrogen) - Refrigeration systems - Cold storage plants - Petrochemical low-temperature pipelines.
Advantages	- Excellent low-temperature toughness. - Compliance with stringent impact testing. - Suitable for harsh sub-zero environments.

 

1. Standard Compliance

1.1 ASTM A333

ASTM A333 is a standard established by the American Society for Testing and Materials. This standard specifically pertains to seamless and welded carbon steel pipes for low - temperature service. It sets forth requirements for the material's chemical composition, mechanical properties, and manufacturing processes to ensure the pipes can function effectively in cold environments. Pipes conforming to ASTM A333 must meet strict criteria regarding their ability to resist brittle fracture at low temperatures, which is crucial for applications in industries such as cryogenics, liquefied natural gas (LNG) handling, and refrigeration.

2. Material Composition

2.1 Carbon Steel

The base material of these pipes is carbon steel, mainly composed of iron and carbon. The carbon content in ASTM A333 welded carbon steel pipes typically ranges from approximately 0.10% to 0.30%. This carbon content strikes a balance between providing the necessary strength and maintaining a certain level of ductility. Carbon in the steel forms carbide structures, which contribute to the material's strength. However, in the context of low - temperature applications, the carbon content is carefully controlled to prevent excessive brittleness.

2.2 Alloying Elements

In addition to carbon, other alloying elements are added to enhance the pipe's performance at low temperatures. Manganese is commonly present, usually in amounts up to around 1.35%. Manganese improves the hardenability of the steel and acts as a deoxidizer during the manufacturing process. It also helps in enhancing the steel's toughness, which is vital for withstanding the stresses in low - temperature environments. Small amounts of silicon, typically up to about 0.35%, are added to improve the steel's strength and oxidation resistance. The levels of sulfur and phosphorus are strictly regulated. High sulfur content can lead to embrittlement, especially at low temperatures, and phosphorus can reduce the ductility. Thus, their maximum allowable levels are often set at 0.040% or lower. Some grades of ASTM A333 pipes may also contain trace amounts of nickel, which further improves the low - temperature toughness of the steel.

3. Manufacturing Process

3.1 Welding Process

These pipes are manufactured through welding processes. Common welding methods include electric resistance welding (ERW) and submerged arc welding (SAW). In the ERW process, an electric current is passed through the edges of the steel strip as it is formed into a tube shape. The heat generated by the resistance to the electric current melts the edges, and they are then pressed together to create a weld. This method is relatively fast and suitable for producing pipes with smaller diameters and thinner wall thicknesses. Submerged arc welding, on the other hand, involves striking an arc between a consumable electrode and the workpiece, with the arc being submerged in a blanket of granular flux. The flux protects the weld area from oxidation and provides additional filler material. SAW is often used for larger - diameter pipes and those with thicker walls, as it can produce high - quality, strong welds. After welding, the pipes may undergo heat treatment, such as stress - relieving heat treatment. This heat treatment helps to reduce internal stresses generated during the welding process, which is important for preventing cracking and improving the overall performance of the pipes, especially in low - temperature applications.

4. Mechanical Properties

4.1 Tensile Strength

ASTM A333 welded carbon steel pipes have a specified tensile strength range. For most grades, the minimum tensile strength typically ranges from around 415 MPa to 620 MPa. High tensile strength is essential for the pipes to withstand the internal pressure exerted by the fluids flowing through them, even in low - temperature conditions. In a cryogenic pipeline, for example, the pipe must be able to resist bursting under the high - pressure and low - temperature conditions of the flowing cryogenic fluid.

4.2 Yield Strength

The yield strength of these pipes is a critical property. It represents the stress level at which the pipe material starts to deform plastically. The minimum yield strength for ASTM A333 pipes usually ranges from approximately 240 MPa to 415 MPa, depending on the grade. Knowing the yield strength is crucial for designing pipelines. If the operating pressure in a low - temperature pipeline causes a stress in the pipe that exceeds its yield strength, permanent deformation will occur, which could lead to pipeline failure.

4.3 Low - Temperature Toughness

One of the most important mechanical properties of ASTM A333 pipes is their low - temperature toughness. This is measured using tests such as the Charpy V - notch impact test. The pipes are required to have sufficient toughness at low temperatures to prevent brittle fracture. For example, in LNG applications, where the temperature can drop to extremely low levels (around - 162°C), the pipes must be able to withstand the impact and mechanical stresses without cracking. The alloying elements and manufacturing processes are optimized to ensure the pipes meet the required low - temperature toughness standards.

5. Applications

5.1 Cryogenic Industry

ASTM A333 welded carbon steel pipes are extensively used in the cryogenic industry. They are used to transport cryogenic fluids such as liquid nitrogen, liquid oxygen, and liquid hydrogen. These fluids are used in various applications, including in scientific research, medical applications (such as cryopreservation), and in the production of semiconductors. The pipes' ability to withstand low temperatures and high pressures makes them suitable for these critical applications.

5.2 Liquefied Natural Gas (LNG) Handling

In the LNG industry, these pipes play a crucial role. They are used in the transportation and storage of LNG. LNG is typically stored and transported at very low temperatures (- 162°C). ASTM A333 pipes are designed to handle these low - temperature conditions, ensuring the safe and efficient transfer of LNG from production facilities to storage tanks and then to distribution points. The pipes' resistance to brittle fracture at low temperatures is essential for preventing leaks and ensuring the integrity of the LNG handling system.

5.3 Refrigeration Systems

In large - scale refrigeration systems, such as those used in food processing plants and cold storage facilities, ASTM A333 welded carbon steel pipes are used to transport refrigerants. These systems operate at low temperatures, and the pipes need to be able to withstand the pressure and temperature changes associated with the refrigeration cycle. The pipes' durability and low - temperature performance make them a suitable choice for these applications, helping to maintain the cold environment required for food preservation and other refrigeration - dependent processes.

 

Chemical Composition of ASTM A333
Element	Grade 1, %	Grade 3, %	Grade 4, %	Grade 6, %	Grade 7, %	Grade 8, %	Grade 9, %	Grade 10, %	Grade 11, %
C	0.30	0.19	0.12	0.30	0.19	0.13	0.20	0.20	0.10
Mn	0.40-1.06	0.31-0.64	0.50-1.05	0.29-1.06	0.90	0.90	0.40-1.06	1.15-1.50	0.60
P	0.025	0.025	0.025	0.025	0.025	0.025	0.025	0.035	0.025
S	0.025	0.025	0.025	0.025	0.025	0.025	0.025	0.015	0.025
Si	...	0.18-0.37	0.08-0.37	0.10 min	0.13-0.32	0.13-0.32	...	0.10-0.35	0.35
Ni	...	3.18-3.82	0.47-0.98	0.40	2.03-2.57	8.40-9.60	1.60-2.24	0.25	35.0-37.0
Cr	...	...	0.44-1.01	0.30	...	...	...	0.15	0.50
Cu	...	...	0.40-0.75	0.40	...	...	0.75-1.25	0.15	...
Al	...	...	0.04-0.30	...	...	...	...	0.06	...
V	...	...	...	0.08	...	...	...	0.12	...
Cb	...	...	...	0.02	...	...	...	0.05	...
Mo	...	...	...	0.12	...	...	...	0.05	0.50
Co	...	...	...	...	...	...	...	...	0.50

 

ASTM A333 Steel Pipe Mechanical Properties

 

ASTM A333	Tensile Strength, min.		Yield Strength, min.		Elongation %, min.
Grade	psi	MPa	psi	MPa	Longitudinal	Transverse
Grade 1	55 000	380	30 000	205	35	25
Grade 3	65 000	450	35 000	240	30	20
Grade 4	60 000	415	35 000	240	30	16.5
Grade 6	60 000	415	35 000	240	30	16.5
Grade 7	65 000	450	35 000	240	30	22
Grade 8	100 000	690	75 000	515	22	...
Grade 9	63 000	435	46 000	315	28	...
Grade 10	80 000	550	65 000	450	22	...
Grade 11	65 000	450	35 000	240	18	...

Detailed Photos

 

 

 

Processing of Production