ASTM A333 Grade 6 Pipe for Low Temperature Services ASTM A333 Grade 6 Seamless Pipes
A333 / SA333 Grade 6 Pipe
A333 Grade 6 Steel Pipe can withstand impact toughness at -45C (-50F) , A333 Grade 6 seamless pipes Commonly used in applications where pressure piping is exposed directly to cold environments below freezing point.
ASTM A333 Gr 6 is a specific grade of low-temperature carbon steel (LTCS) pipe used in various industrial applications. It is a seamless and welded carbon and alloy steel pipe intended for use at low temperatures, typically above -50°F (-45°C). The “Gr 6” designation refers to the grade of steel, which meets the requirements of the ASTM A333 standard. In general, A333-6 pipes are manufactured in a size range from 1/2 inches to 24 inches.
A333 Gr 6 is typically used in applications where temperatures can drop as low as -50°F (-45°C), and its chemical composition is designed to provide high-impact toughness at these temperatures.
This specification covers seamless and welded steel pipe for use in low-temperature service, and it requires impact testing at temperatures as low as -50°F to ensure its quality and reliability.
A333 Gr 6 is widely used in the construction of pipelines, tanks, and pressure vessels that require high strength and toughness in low-temperature environments.
ASTM A333 Grade 6 Equivalent material
Some of the equivalent materials to ASTM A333 Grade 6 are:
- API 5L Grade X52
- EN 10216-4 P355NL1
Certification: All seamless pipe is ordered dual certified according to ASTM/ASME A/SA 333/3, Certification is EN10204 3.1 and conforms to NACE MR-01-03, NACE MR-01-75 and PED 97/23/EC.
A333 / SA333 Grade 6 Chemical Composition Requirements
| Element | Grade 6 |
| Carbon, max | 0.30 |
| Manganese | 0.29-1.06 |
| Phosphorus, max | 0.025 |
| Sulphur, max | 0.025 |
| Silicon | 0.10 min |
| Nickel | 0.40 max |
| Chromium | 0.30 max |
| Copper | 0.40 max |
| Aluminum | — |
| Vanadium, max | 0.08 |
| Columbium, max | 0.02 |
| Molybdenum, max | 0.12 |
For each reduction of 0.01 percent carbon below 0.30 percent , an increase of 0.05 percent manganese above 1.06 percent would be permitted to a maximum of 1.35 percent manganese.
A333 / SA333 Grade 6 Pipe Tensile Requirements
The material shall conform to the requirements as proscribed:
| Grade 1 | Grade 3 | Grade 6 | |||||
| psi | MPa | psi | MPa | psi | MPa | ||
| Tensile Strength, min | 55,000 | 380 | 65,000 | 450 | 60,000 | 415 | |
| Yield Strength, min | 30,000 | 205 | 35,000 | 240 | 35,000 | 240 | |
| Longitudinal | Transverse | Longitudinal | Transverse | Longitudinal | Transverse | ||
A333 / SA333 Grade 6 Pipe Heat Treatment Requirements
All seamless and welded pipe shall be treated to control their microstructure by the following methods: Normalizing per A 333/A 333M-05 section 4.2.1.1; section 4.2.1.2 or section 4.2.1.3 Quenched and Tempered per A 333/A 333M – 05 section 4.2.2.1 Double Normalized and Tempered per A 333/A 333M – 05 section 4.2.2.2
A333 / SA333 Grade 6 Pipes Impact Requirements
For Grades 1, 3 and 6, the notched-bar impact properties of each set of three impact specimens, including specimens for the welded joint in welded pipe with wall thicknesses of 0.120 in. [3 mm] and larger, shall not be less than the values prescribed:
| Size of Specimen, min | Minimum Average Notched Bar Impact Value of Each Set of Three Specimens | Minimum Notched Bar Impact Value of One Specimen Only of a Set | Impact Temperature | |||||
| ft-lbf | J | ft-lbf | J | Grade | Min Impact Test Temp |
|||
| 10 by 10 | 13 | 18 | 10 | 14 | F | C | ||
| 10 by 7.5 | 10 | 14 | 8 | 11 | 1 | -50 | -45 | |
| 10 by 6.67 | 9 | 12 | 7 | 9 | 3 | -150 | -100 | |
| 10 by 5 | 7 | 9 | 5 | 7 | 6 | -50 | -45 | |
| 10 by 3.33 | 5 | 7 | 3 | 4 | ||||
| 10 by 2.5 | 4 | 5 | 3 | 4 | ||||
A333 / SA333 Grade 6 Pipe Lengths
Lengths required shall be specified on order. If no definite lengths required, following practice applies: Single Random — 17′ ~ 24′ lengths Double Random — 36′ ~ 44′ lengths
SA333 Grade 6 pipe is a type of seamless and welded carbon steel pipe commonly used in low-temperature applications. Here’s an overview of SA333 Grade 6 pipes:
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- Applications:
- SA333 Grade 6 pipes are widely used in various applications such as:
- Low-temperature process piping
- Cryogenic storage tanks and vessels
- LNG (liquefied natural gas) terminals and pipelines
- Cold storage facilities
- Refrigeration systems
- Air separation units
- Chemical processing plants handling cryogenic fluids
- Corrosion Resistance:
- While SA333 Grade 6 pipes offer good resistance to atmospheric corrosion, they may require additional corrosion protection measures when exposed to aggressive environments or corrosive substances
- SA333 Grade 6 pipes are widely used in various applications such as:
- Applications:
In conclusion, SA333 Grade 6 pipes are an essential component in low-temperature applications where notch toughness and impact properties are critical. Their excellent performance at low temperatures, combined with their versatility and availability in both seamless and welded forms, makes them a preferred choice for various industries requiring reliable piping solutions for cryogenic service.
