ASTM A333 Grade 6 Seamless Steel Pipe Supplier | Low Temperature Pipe
ASTM A333 Grade 6 Seamless Steel Pipe is a carbon steel pipe specified for low-temperature service and other applications where notch toughness is required. ASTM A333/A333M covers seamless and welded steel pipe in several ferritic steel grades. Grade 6 is widely selected for low-temperature pressure piping because it combines adequate strength with verified low-temperature impact toughness. For code applications, the corresponding ASME designation is SA-333 Grade 6.
The product can be supplied as seamless pipe in a range of outside diameters, wall thicknesses, schedules and lengths. Final dimensions, heat treatment, end preparation, impact-test temperature and supplementary requirements should be confirmed against the purchase order and applicable edition of ASTM A333/A333M.
Standard & Grade
|
Parameter |
Specification |
|
Product |
ASTM A333 Gr.6 Seamless Steel Pipe |
|
ASTM Standard |
ASTM A333/A333M |
|
Grade |
Grade 6 |
|
ASME Designation |
SA-333 Grade 6 |
|
Product Type |
Seamless steel pipe |
|
Service |
Low-temperature service and applications requiring notch toughness |
|
Applicable Dimensions |
Commonly ordered by NPS/OD, wall thickness or Schedule; dimensional selection should follow the purchase specification |
Chemical Composition
|
Element |
Requirement, % |
|
Carbon (C) |
0.30 max |
|
Manganese (Mn) |
0.29–1.06 |
|
Phosphorus (P) |
0.025 max |
|
Sulfur (S) |
0.025 max |
|
Silicon (Si) |
0.10 min |
Mechanical Properties
|
Property |
Indicator |
Metric value |
Imperial value |
|
Tensile Strength |
Minimum |
415 MPa |
60 000 psi |
|
Yield Strength |
Minimum |
240 MPa |
35 000 psi |
|
Elongation (longitudinal, L) |
Minimum |
30 % (gauge 50 mm) |
30 % (gauge 2 in.) |
|
Elongation (transverse, T) |
Minimum |
16.5 % |
16.5 % |
Impact Requirements
Low-temperature notch toughness is a key requirement of ASTM A333. Grade 6 is commonly associated with a Charpy impact test temperature of −45°C (−50°F). The actual test temperature, specimen dimensions and acceptance criteria must follow the applicable ASTM A333/A333M edition and the purchase order. Impact-test records should be reviewed together with the heat number, product dimensions and MTC for project acceptance.
|
Item |
Reference Information |
|
Typical Grade 6 Impact Test Temperature |
−45°C (−50°F) |
|
Test |
Charpy V-notch impact test |
|
Purpose |
Verification of notch toughness for low-temperature service |
|
Project Control |
Confirm exact temperature and acceptance criteria in the applicable standard, ITP and PO |
Low-Temperature Performance
Low-temperature toughness is one of the defining requirements of ASTM A333 Grade 6 seamless steel pipe. The ASTM A333/A333M specification covers steel pipe intended for low-temperature service and other applications where notch toughness is required.
For Grade 6, Charpy V-notch impact testing is an important part of material verification. The commonly specified impact-test temperature for Grade 6 is −45°C (−50°F). The actual test temperature, specimen requirements and acceptance criteria should always be confirmed against the applicable ASTM A333/A333M edition and purchase order.
Impact-test results can be reviewed together with the heat number, material test certificate and dimensional information to support project quality control.
Heat Treatment
ASTM A333 requires heat treatment to control the microstructure and properties of covered pipe, subject to the grade and applicable standard provisions. For Grade 6, normalized treatment and other permitted heat-treatment routes may be used in accordance with ASTM A333/A333M. The heat-treatment condition should be recorded on the MTC when required by the order.
Applications & Industries
LNG / Oil & Gas：Main pipelines, receiving stations, storage facilities
Chemical Refrigeration：Ethylene, propylene, ammonia, N-P-K fertilizer production
Food Cold Storage & Condensate Systems
Continuous service temperature：Up to -45°C (short time can go lower)
Key Product Advantages
Low-Temperature Toughness
Designed for applications where verified notch toughness is required at low temperatures.
Seamless Construction
Manufactured without a longitudinal weld seam, providing a continuous pipe body.
Controlled Mechanical Properties
Minimum tensile and yield strength requirements are specified by ASTM A333 for Grade 6.
Flexible Dimensions
Available in different outside diameters, wall thicknesses, schedules and lengths according to project requirements.
Packaging & Delivery
Each ASTM A333 Grade 6 seamless steel pipe order can be supplied with relevant inspection and material documentation according to the purchase specification. Quality documentation may include chemical composition, mechanical properties, heat-treatment information, dimensional inspection and impact-test results where required.
Pipes are normally bundled with steel straps and can be supplied with protective end caps, weather-resistant wrapping and bundle identification for export transportation.
For a quotation, please provide the pipe size, wall thickness or Schedule, length, quantity, ASTM/ASME standard, end preparation and required inspection documents.
ASTM A333 Gr.6 vs ASTM A106 Gr.B
|
Property |
ASTM A333 Gr.6 |
ASTM A106 Gr.B |
|
Primary Service Focus |
Low-temperature service and required notch toughness |
High-temperature/general pressure service |
|
Low-Temperature Impact |
Specified by ASTM A333 requirements |
Not the defining requirement of ASTM A106 Gr.B |
|
Tensile Strength |
415 MPa min |
Higher minimum tensile strength under A106 requirements |
|
Selection Principle |
Choose when low-temperature toughness is a key design requirement |
Choose when the piping design is based on A106 high-temperature/general pressure service |
FAQ
Q1. What is ASTM A333 Grade 6 seamless steel pipe?
ASTM A333 Grade 6 seamless steel pipe is a carbon steel pipe specified for low-temperature service and applications requiring notch toughness. It is manufactured according to ASTM A333/A333M.
Q2. What is the impact test temperature for ASTM A333 Grade 6?
Grade 6 is commonly tested for Charpy V-notch impact toughness at −45°C (−50°F). The exact test requirements and acceptance criteria should be confirmed according to the applicable ASTM A333/A333M edition and purchase order.
Q3. What is the difference between ASTM A333 Grade 6 and ASTM A106 Grade B?
ASTM A333 Grade 6 is primarily specified for low-temperature service and notch toughness, while ASTM A106 Grade B is commonly used for seamless carbon steel pipe for high-temperature service. The appropriate grade should be selected according to the design temperature, pressure, medium and applicable piping requirements.
Q4. What information is required to quote ASTM A333 Grade 6 pipe?
Please provide the pipe size or NPS, outside diameter, wall thickness or Schedule, length, quantity, end preparation, applicable standard and required inspection or certification documents.
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