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ASTM A333 Grade 6 Seamless Steel Pipe for Low-Temperature Service
ASTM A333 grade 6 is a standard covered seamless and welded carbon and alloy steel pipe for low temperatures, similar to AISI 4032 low alloy steel.
Description
ASTM A333 is mainly used for seamless steel pipes for low-temperature pressure vessel at -45℃ ~ -195℃ and low-temperature heat exchanger pipelines. ASTM A333 grade 6 is a standard covered seamless and welded carbon and alloy steel pipe for low temperatures, similar to AISI 4032 low alloy steel. The welding process should be no filler metal shall be added during welding operations.
ASTM A333 Seamless and Welded Steel Pipe for Low-Temperature Service
Standard Specification for Seamless and Welded Steel Pipe for Low-Temperature Service and Other Applications with Required Notch Toughness
ASTM A333 Grade 6 Seamless Pipe involved is similar to AISI 4032 low alloy steel. The ASTM A333 Grade 6 low alloy steel seamless pipes are intended for low temperature services with minimum design temperature -45°C [-50°F] requiring notch toughness. They are usually furnished in nominal pipe size (NPS) and nominal wall thickness with schedule numbers in accordance with ASME B36.10M. They are often connected with flanges of ASTM A350 LF2 and butt-weld pipe fittings of ASTM A420 WPL6. Seamless pipes made from ASTM A333 Gr.6 are primarily used for the construction of pipelines in the production of ethylene, propylene, urea, ammonia, and N-P-K compound fertilizer. They may be involved in the scrubber, purification, desulfurization and degreasing processes in oil & gas, petrochemical, coal and pharmaceutical industries. They can also be used for the fabrication of cryogenic equipment as well as refrigeration houses.
ASTM A333 Grade 6 is the part of standard covers wall seamless and welded carbon and alloy steel pipe intended for use at low temperatures. ASTM A333 Grade 6 alloy pipe shall be made by the seamless or welding process with the addition of no filler metal in the welding operation.
ASTM A333 GR.6 Pipes Charpy V-Notch Impact Test
Toughness, or ductility, is the ability of a material to resist impact, to withstand repeated reversals of stress, or to absorb energy when stressed beyond the elastic limit. Steel is normally considered to be a ductile material, however, it may shatter just as glass at certain low temperatures. The critical ductile-to-brittle transition temperature (CDBTT) for any steel is the temperature above which the steel behaves in a predominantly ductile manner and below which it behaves in a predominantly brittle manner. The low alloy steel pipe of ASTM A333 Gr.6 with a low CDBTT can be used at temperatures down to -45°C [-50°F]. It is important to verify that the pipe materials are impact tested and exhibit a sufficient high Charpy toughness.
The Charpy V-notch impact test shall be conducted at -45°C [-50°F] with three testing specimens in the size of 10 mm x 10 mm x 55 mm. The minimum average energy absorbed for three specimens shall be 18 J [13 ft*lbf], and the minimum energy absorbed for each specimen is 14 J [10 ft*lbf]. The actual tests have been done to three specimens which were taken from ASTM A333 Gr.6 seamless pipes produced by BAOSTEEL. The results listed in the table below indicate that the steel exhibits superior impact toughness, which is at least 20 times higher than the standard value.
Raw material
Size inspection
Seamless pipes with compound bevels as per ASME B16-25 And ASTM A333
Application: Seamless and Welded Steel Pipe for Low-Temperature Service.
Steel grade: ASTM A333 Grade 6
Inspection and Test: Chemical Composition Inspection, Mechanical Properties Test(Tensile Strength,Yield Strength, Elongation, Flaring, Flattening, Bending, Hardness, Impact Test), Surface and Dimension Test,No-destructive Test, Hydrostatic Test.
Surface treatment: Oil-dip, Varnish, Passivation, Phosphating, Shot Blasting.
Both ends of each crate will indicate the order no., heat no., dimensions, weight and bundles or as requested.
ASTM A333 Grade 6 Chemical Compositions(%)
| Compositions | Data |
| Carbon(max.) | 0.30 |
| Manganese | 0.29-1.06 |
| Phosphorus(max.) | 0.025 |
| Sulfur(max.) | 0.025 |
| Silicon | … |
| Nickel | … |
| Chromium | … |
| Other Elements | … |
Mechanical properties for ASTM A333 Grade 6 Alloy Steel
| Properties | Data |
| Tensile strength, min, (MPa) | 415 Mpa |
| Yield strength, min, (MPa) | 240 Mpa |
| Elongation, min, (%), L/T | 30/16.5 |
Impact requirements:
the notched-bar impact properties of each set of three impact specimens, when tested at temperature specified shall be not less than the values prescribed.
Referenced Documents
- ASTM A 370 Test Methods and Definitions for Mechanical testing of Steel Products
- ASTM A999/A 999M Specification for General requirements for Alloy and Stainless Steel Pipe.
- ASTM A 671 Specification for General requirements for Alloy and Stainless Steel Pipe
- ASTM E 23 Test Methods for Notched bar Impact testing of Metallic Materials
Scope
ASTM A333 covers nominal (average) wall seamless and welded carbon and alloy steel pipe intended for use at low temperatures. Several grades of ferritic steel are included. Some product sizes may not be available under this specification because heavier wall thicknesses have an adverse affect on low-temperature impact properties.
A333 pipe is furnished to nine different grades designated by numbers 1, 3, 4, 6, 7, 8, 9, 10, & 11.
Chemical composition (%) of ASTM a333 steel pipe
| Grade | C | Si | Mn | P | S | Cr | Ni | Cu | Mo | V | Al |
|---|---|---|---|---|---|---|---|---|---|---|---|
| ASTM A333 Grade 1 | ≤0.30 | 0.40-1.06 | ≤0.025 | ≤0.025 | |||||||
| ASTM A333 Grade 3 | ≤0.19 | 0.18-0.37 | 0.31-0.64 | ≤0.025 | ≤0.025 | 3.18-3.82 | |||||
| ASTM A333 Grade 4 | ≤0.12 | 0.18-0.37 | 0.50-1.05 | ≤0.025 | ≤0.025 | 0.44-1.01 | 0.47-0.98 | 0.40-0.75 | 0.04-0.30 | ||
| ASTM A333 Grade 6 | ≤0.30 | ≥0.10 | 0.29-1.06 | ≤0.025 | ≤0.025 | ||||||
| ASTM A333 Grade 7 | ≤0.19 | 0.13-0.32 | ≤0.90 | ≤0.025 | ≤0.025 | 2.03-2.57 | |||||
| ASTM A333 Gr. 8 | ≤0.13 | 0.13-0.32 | ≤0.90 | ≤0.025 | ≤0.025 | 8.40-9.60 | |||||
| ASTM A333 Grade 9 | ≤0.20 | 0.40-1.06 | ≤0.025 | ≤0.025 | 1.60-2.24 | 0.75-1.25 | |||||
| ASTM A333 Grade 10 | ≤0.20 | 0.10-0.35 | 1.15-1.50 | ≤0.03 | ≤0.015 | ≤0.15 | ≤0.25 | ≤0.015 | ≤0.50 | ≤0.12 | ≤0.06 |
| ASTM A333 Grade 11 | ≤0.10 | ≤0.35 | ≤0.6 | ≤0.025 | ≤0.025 | ≤0.50 | 35.0-37.0 | ≤0.50 |
Mechanical requiremnts of ASTM A333 alloy pipe
| Grade | Tensile Strength | Yield Point | Elongation (%) | |
|---|---|---|---|---|
| (MPa） | (MPa) | Y | X | |
| ASTM A333 Grade 1 | ≥380 | ≥205 | ≥35 | ≥25 |
| ASTM A333 Grade 3 | ≥450 | ≥240 | ≥30 | ≥20 |
| ASTM A333 Grade 4 | ≥415 | ≥240 | ≥30 | ≥16.5 |
| ASTM A333 Grade 6 | ≥415 | ≥240 | ≥30 | ≥16.5 |
| ASTM A333 Grade 7 | ≥450 | ≥240 | ≥30 | ≥22 |
| ASTM A333 Gr. 8 | ≥690 | ≥515 | ≥22 | |
| ASTM A333 Grade 9 | ≥435 | ≥315 | ≥28 | |
| ASTM A333 Grade 10 | ≥550 | ≥450 | ≥22 | |
| ASTM A333 Grade 11 | ≥450 | ≥240 | ≥18 | |
Production specification range of low temperature pipe products
| No. | Order No. | Size description | ||
| O.D./mm | W.T./mm | Legnth/m | ||
| 1 | A333 Gr.6 A333 Gr.6/X42NS | 10～127 | 1～20 | 6～12.0 |
| 42～114.3 | 3.5～6 | 6～12.2 | ||
| 42～114.3 | 6～12 | 6～12.2 | ||
| 114.3～180 | 3.8～8 | 6～12.2 | ||
| 114.3～180 | 8～22 | 6～12.2 | ||
| 68～180 | 10～14 | 6～12.2 | ||
| 69～254 | 14～55 | 6～12.2 | ||
| 140～340 | 6～8 | 6～12.2 | ||
| 140～368 | 8～42 | 6～12.2 | ||
| 318～720 | 14～50 | 4～12.5 | ||
| 2 | A333 Gr.6/X52QS | 42～114.3 | 3.5～12 | 6～12.2 |
| 114.3～180 | 3.8～22 | 6～12.2 | ||
| 68～254 | 10～40 | 6～12.2 | ||
| 140～368 | 6～40 | 6～12.2 | ||
| 318～720 | 14～40 | 4～12.5 | ||
| 140～368 | 6～25 | 6～12.2 | ||
| 318～720 | 14～25 | 4～12.5 | ||
| 3 | 16MnDG | 10～127 | 1～20 | 6～12.0 |
| 42～114.3 | 3.5～12 | 6～12.2 | ||
| 114.3～180 | 3.8～22 | 6～12.2 | ||
| 68～254 | 10～55 | 6～12.2 | ||
| 140～368 | 6～42 | 6～12.2 | ||
| 318～720 | 14～120 | 4～12.5 | ||
Strike temperature condition
| Crade | The lowest temperature for strike test | |
|---|---|---|
| ℉ | ℃ | |
| ASTM A333 Grade 1 | -50 | -45 |
| ASTM A333 Grade 3 | -150 | -100 |
| ASTM A333 Grade 4 | -150 | -100 |
| ASTM A333 Grade 6 | -50 | -45 |
| ASTM A333 Grade 7 | -100 | -75 |
| ASTM A333 Grade 8 | -320 | -195 |
| ASTM A333 Grade 9 | -100 | -75 |
| ASTM A333 Grade 10 | -75 | -60 |
Sunny Steel Supply supplies a full range of ASTM A333 (ASME S/A 333)
Low Temperature Steel Pipe Specifications & Grades
- SA333 & A333 – Grades 1, 3, 6 & 8
- A671 CC65 CL22 EFW at -50°F (Welded Alternative to A333)
- Flanges: A/SA 350 LF2, LF3
- Fittings: A/SA-420 WPL6, WPL3
Acceptable for ASME Codes
| ASME Codes | ASTM A333 Gr.6 |
|---|---|
| B31.1 | Yes |
| B31.3 | Yes |
| B31.4 | Yes |
| B31.5 | Yes |
| 31.8 | Yes |
| Section I | Yes |
| Section III | Yes |
| Section VIII-1 | Yes |
| Section XII | Yes |
| Section VIII-2 | Yes |
