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 |
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
Designed for low-temperature service where notch toughness is required.
Seamless construction provides a continuous pipe body without a longitudinal weld seam.
Minimum tensile strength of 415 MPa and minimum yield strength of 240 MPa provide a useful strength level for pressure piping.
Grade 6 is widely used and has broad recognition in low-temperature carbon steel piping projects.
Can be supplied in different sizes, wall thicknesses, schedules, lengths and end preparations subject to the actual supply range.
Material traceability and impact-test documentation can support project quality-control requirements.
Packaging & Delivery
ASTM A333 Gr.6 seamless steel pipes are normally bundled for transport. Export packaging can include steel straps, protective end caps, weather-resistant wrapping and bundle identification. For sea freight, packaging should be selected according to destination, handling method and customer requirements. The final packing method should be confirmed before shipment.
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 the minimum service temperature of ASTM A333 Gr.6?
The standard specifies the impact test at -45 °C / -50 °F, with a 3-piece average ≥ 18 J. The general project design temperature should be ≥ -45 °C; lower temperatures require Gr.7 / Gr.8 / Gr.9 etc.
Q2. Is ASTM A333 Gr.6 the same as SA-333 Gr.6?
Fully equivalent. SA-333 is the ASME version of A333; both material, tests and acceptance are identical - only the issuing standard number differs. ASME pressure piping projects (B31.1 / B31.3) must use SA-333.
Q3. What is the difference between Gr.6 and Gr.1 / Gr.3?
All three are carbon steels with the same impact temperature (-45 °C) but slightly different composition ranges (Gr.3 contains Ni). Gr.6 is the most commonly specified and most easily procured grade.
Q4. Is NACE MR 0175 required?
Only when the medium is sour (H₂S-containing) oil & gas environment. Add hardness limits (typically HRC ≤ 22) and S6 supplementary requirement. Ordinary LNG / chemical projects do not require it.
Q5. Is third-party inspection available?
Yes. SGS, BV, TUV, DNV, CCS and other third parties can be designated. Cost coordinated with order; documents issued as EN 10204 Type 3.2.
Q6. Minimum order quantity?
Usually calculated by size × heat number (several tons). Mixed sizes / batches are flexible. Please confirm specific specifications with sales.
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