ASTM A334 Grade 6 Seamless Tubes are low-temperature carbon steel tubes that are produced according to the standards of ASTM A334 / ASME SA334 for high toughness and strength in cold service applications. These are generally classified as Carbon Steel Pipes & Tubes and are used in industries for critical use because of their superior mechanical properties. ASTM A334 Grade 6 Seamless Tubes consist of a max carbon percentage of 0.30%, consisting of manganese from 0.29% to 1.06%, providing improved strength, impact resistance, and anti-corrosion properties. Some common applications for the Carbon Steel Seamless Pipes & Tubes include the following industries such as Petrochemical plants, Oil and gas industries, Marine environments, Food processing plants, Heat exchangers, and Low temperature engineering systems. USA Piping Solution offers high-quality ASTM A334 Grade 6 Seamless Tubes in various sizes and specifications, which are tested for quality and certified to meet industry standards for use in industrial applications around the world.
Specification of ASTM A334 Grade 6 Seamless Tube
| Feature | Detail |
|---|---|
| Grade | ASTM A334 Gr.6 Carbon Steel |
| Size | 1/2" NB to 36" NB |
| Standard | ASTM A334, ASME SA334 |
| Outer Diameter Size | 1/4" NB To 2" NB |
| Wall Thickness | 1 mm to 8 mm |
| Form | Round, Square, Rectangular, Hydraulic Etc |
| Schedule | SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS |
| Length | Single Random, Double Random & Cut Length |
| Type | Seamless Tube |
| End | Beveled End, Plain End, Threaded Protected With Plastic Caps |
Comparison Table of ASTM A334 Grade 6 vs Grade 1 (ASTM A334)
| Property | Grade 6 | Grade 1 | Key Difference |
|---|---|---|---|
| Yield Strength (min) | 241 MPa (35 ksi) | 207 MPa (30 ksi) | Grade 6 is stronger; matches A106 Gr B. |
| Tensile Strength (min) | 415 MPa (60 ksi) | 380 MPa (55 ksi) | Grade 6 provides higher ultimate strength. |
| Charpy Impact (min) | 20 J (15 ft-lb) | 13 J (10 ft-lb) | Grade 6 is significantly tougher at -45°C. |
| A106 Equivalent | A106 Gr B (35 ksi) | A106 Gr A (30 ksi) | Grade 6 is a direct sub for Gr B in cold service. |
| Industry Preference | Most Popular | Less Common | Grade 6 is the global default LTCS spec. |
| Silicon Requirement | 0.10% min | Not Specified | Grade 6 ensures better deoxidation (killed steel). |
Pressure Rating Chart of ASTM A334 Grade 6 Seamless Tube
| Nominal Size (Inch) | DN (mm) | OD (Inch) | OD (mm) | Wall (Inch) | Wall (mm) | Weight (kg/m) | Mtr/Ton | Weight (lb/ft) | Ft/Ton | Test PSI | Test kPa |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 3/4 | 20 | 1.050 | 26.7 | 0.083* | 2.11 | 1.28 | 781 | 0.86 | 2562 | 700 | 4830 |
| 1 | 25 | 1.315 | 33.4 | 0.109* | 2.77 | 2.09 | 478 | 1.41 | 1568 | 700 | 4830 |
| 1 1/4 | 32 | 1.660 | 42.2 | 0.109* | 2.77 | 2.69 | 372 | 1.81 | 1221 | 1000 | 6890 |
| 1 1/2 | 40 | 1.900 | 48.30 | 0.109* | 2.77 | 3.11 | 322 | 2.09 | 1056 | 1000 | 6890 |
| 2 | 50 | 2.375 | 60.3 | 0.109* | 2.77 | 3.93 | 254 | 2.64 | 833 | 1000 | 6890 |
| 2 1/2 | 65 | 2.875 | 73.0 | 0.120* | 3.05 | 5.26 | 190 | 3.53 | 623 | 1000 | 6890 |
| 3 | 80 | 3.500 | 88.9 | 0.120* | 3.05 | 6.46 | 155 | 4.34 | 509 | 1000 | 6890 |
| 3 1/2 | 90 | 4.000 | 101.6 | 0.120* | 3.05 | 7.41 | 135 | 4.98 | 443 | 1200 | 8270 |
| 4 | 100 | 4.500 | 114.3 | 0.120* | 3.05 | 8.37 | 119 | 5.62 | 390 | 1200 | 8270 |
| 5 | 125 | 5.563 | 141.3 | 0.134* | 3.40 | 11.58 | 86 | 7.78 | 283 | 1200 | 8270 |
| 6 | 150 | 6.625 | 168.3 | 0.134* | 3.40 | 13.85 | 72 | 9.30 | 237 | 1000 | 6890 |
| 8 | 200 | 8.625 | 219.1 | 0.188** | 4.78 | 25.26 | 40 | 16.96 | 130 | 800 | 5520 |
ASTM A334 Grade 6 Seamless Tube Temperature Rating
| Specimen Width (Material Thickness) | Size Ratio | Temp. Reduction (°F) | Temp. Reduction (°C) |
|---|---|---|---|
| 0.394" (10 mm) | Standard Size | 0 | 0 |
| 0.354" (9 mm) | — | 0 | 0 |
| 0.315" (8 mm) | — | 0 | 0 |
| 0.295" (7.5 mm) | 3/4 Standard | 5 | 3 |
| 0.276" (7 mm) | — | 8 | 4 |
| 0.262" (6.67 mm) | 2/3 Standard | 10 | 5 |
| 0.236" (6 mm) | — | 15 | 8 |
| 0.197" (5 mm) | 1/2 Standard | 20 | 11 |
| 0.158" (4 mm) | — | 30 | 17 |
| 0.131" (3.33 mm) | 1/3 Standard | 35 | 19 |
| 0.118" (3 mm) | — | 40 | 22 |
| 0.099" (2.5 mm) | 1/4 Standard | 50 | 28 |
Application and Industrial Uses of ASTM A334 Grade 6 Seamless Tube
- Low-Temperature Piping Systems
- Oil & Gas Processing Plants
- Petrochemical Industries
- LNG & Cryogenic Processing Plants
- Heat Exchangers
- Condensers
- Boiler Systems
- Pressure Vessel Applications
- Power Generation Plants
- Construction & Infrastructure Industry
Other Grades of ASTM Pipes & Tubes
- ASTM A691 Grade 5 (5Cr-½Mo) EFW Pipe
- ASTM A691 Grade 9 (9Cr-1Mo) EFW Pipe
- ASTM A519 4130 Seamless Tube
- ASTM A519 4140 Seamless Tube
- ASTM A519 8620 Seamless Tube
- ASTM A192 / ASME SA192 tubes
- ASTM A333 Grade 1 Pipe
- ASTM A334 Grade 6 Seamless Tube
- ASTM A334 Grade 1 Seamless Tube
- SA334 Grade 6 Tube / Pipe
Frequently Asked Questions
What is ASTM A334 Grade 6 Seamless Tube?
ASTM A334 Grade 6 Seamless Tube is a low-temperature carbon steel tube designed for applications requiring high toughness and strength in cold service conditions.
What is the difference between ASTM A334 Grade 1 and Grade 6?
Grade 6 contains nickel, which provides better toughness, higher strength, and improved low-temperature impact resistance compared to Grade 1.
Is ASTM A334 Grade 6 suitable for low-temperature applications?
Yes, ASTM A334 Grade 6 is specially designed for low-temperature and cryogenic service applications.
What is the temperature range for ASTM A334 Grade 6 pipes?
ASTM A334 Grade 6 pipes are commonly used in temperatures as low as -45°C (-50°F) and below depending on application requirements.
Are ASTM A334 Grade 6 tubes seamless or welded?
ASTM A334 Grade 6 tubes are available in both seamless and welded forms based on project and pressure requirements.