SA333 Gr 6 Seamless Pipe, Impact Tested at −45 °C
Dinesh Tube India supplies ASTM A333 Grade 6 carbon steel pipes from Mumbai to EPC contractors, LPG and ammonia plants, gas processing and refinery projects in India and abroad. We supply A333 Gr 6 seamless pipe from 1/2" to 24" NB, in SCH 10 to XXS, with an EN 10204 3.1 certificate showing Charpy impact results at −45 °C, and NACE MR0175 on request.
This page gives the full technical data for Grade 6. For a general introduction to low-temperature pipe and the other grades, see our LTCS pipe and material guide.
What Is ASTM A333 Grade 6?
ASTM A333/A333M covers seamless and welded carbon and alloy steel pipe for low-temperature service, and ASME adopts it as SA333. Grade 6 is its carbon-manganese grade: chemically close to A106 Gr B, but normalised and Charpy impact tested at −45 °C (−50 °F) so it stays tough instead of brittle in cold service.
That makes A333 Gr 6 the default pipe for LPG, ammonia, refrigeration and gas processing lines, and for plant in cold climates. It is paired with A420 WPL6 fittings and A350 LF2 flanges in a complete low-temperature piping system.
ASTM A333 Grade 6 Chemical Composition
Values in weight %. For each 0.01% reduction below 0.30% carbon, a 0.05% increase in manganese above 1.06% is permitted, up to 1.35% Mn.
A333 Grade 6 Mechanical Properties & Charpy Values
Full-size (10 × 10 mm) Charpy V-notch specimens. Sub-size specimens are used for thinner walls, with proportionally reduced values. Many project specifications ask for higher energy, such as 27 J average; state this on the order.
Need A333 Gr 6 pipe for an LPG or ammonia line? Send your size, schedule, length, quantity and any NACE or project impact requirement to kamlesh@dineshtube-india.com or call +91 98330 06252. You can also send an enquiry.
A333 Grade 6 vs Grade 1, Grade 3 & Grade 8
For tubes in the same service, see ASTM A334 Gr 1 tubes.
A333 Grade 6 Pipe Weight Chart
Plain-end weights per ASME B36.10M. Heavy walls must still meet the −45 °C impact requirement, so very thick sizes are confirmed with the mill before order.
Types of A333 Gr 6 Pipe
A333 Gr 6 Seamless
A333 Gr 6 Welded
NACE A333 Gr 6
ASTM A333 Grade 6 Equivalent Material
Nearest equivalents only. Impact test temperature and energy may differ; check against your design code before substituting.
A333 Grade 6 Pipe Applications
Matching A420 WPL6 fittings, A350 LF2 flanges and LTCS flanges are available. See all carbon steel pipes.
ASTM A333 Grade 6 Pipes: FAQs
What is ASTM A333 Grade 6?
ASTM A333 Grade 6 is a carbon-manganese steel pipe grade for low-temperature service. It is normalised (or controlled-rolled) and Charpy impact tested at −45 °C (−50 °F), with a minimum tensile strength of 415 MPa and yield of 240 MPa. ASME adopts it as SA333 Gr 6. It is the most widely used low-temperature carbon steel (LTCS) pipe grade.
What is the difference between A333 Grade 6 and Grade 1?
Both are carbon steel grades impact tested at −45 °C. Grade 6 is stronger, with minimum tensile and yield of 415 / 240 MPa against 380 / 205 MPa for Grade 1, so it allows thinner walls at the same pressure. Grade 6 is the usual choice for process piping; Grade 1 is softer and sometimes used where extra ductility is wanted.
What is the difference between A333 Grade 6 and A106 Grade B?
They have the same minimum strength and very similar chemistry. The difference is toughness: A333 Gr 6 is normalised and Charpy impact tested at −45 °C, while A106 Gr B is not impact tested and is written for high-temperature service. Pipe is sometimes dual certified to A333 Gr 6 and A106 Gr B for use in both cold and ambient lines.
What is the minimum design temperature for A333 Grade 6 pipe?
A333 Grade 6 is impact tested at −45 °C (−50 °F), so it is normally used for design temperatures down to about −45 °C. For colder service, nickel steel grades are used: A333 Grade 3 (3.5% Ni) to −100 °C and Grade 8 (9% Ni) to −195 °C, or austenitic stainless steel for cryogenic service such as LNG.
Can A333 Grade 6 pipe be used for sour service?
Yes, when ordered to NACE MR0175 / ISO 15156 or NACE MR0103. These limit hardness, typically to 22 HRC (about 250 HV) maximum including welds, and may add chemistry limits. State the NACE requirement on the order so it is covered by the mill certificate.
What fittings and flanges are used with A333 Grade 6 pipe?
A333 Gr 6 pipe is normally used with ASTM A420 WPL6 butt-weld fittings and ASTM A350 LF2 Class 1 flanges, which are also impact tested at −46 °C. Together they form a complete LTCS piping system.
Export Destinations for A333 Gr 6 Pipes
We export ASTM A333 Grade 6 pipes to the Middle East (UAE, Saudi Arabia, Qatar, Kuwait, Oman, Bahrain, Iraq, Jordan), Africa (Nigeria, Egypt, South Africa, Kenya, Ghana, Algeria, Morocco, Tunisia), Asia (Japan, South Korea, Singapore, Malaysia, Indonesia, Thailand, Vietnam, Philippines, Bangladesh, Sri Lanka), Europe (Italy, Spain, Portugal, France, Netherlands, Belgium, Poland, Romania, Turkey, United Kingdom), and the Americas (United States, Canada, Mexico, Brazil, Chile, Peru, Colombia, Argentina).