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About ASTM A333 Gr.6 Low-Temperature SMLS Pipe
ASTM A333 Grade 6 Low Alloy Steel Seamless Pipe is designed for low-temperature service where the minimum design temperature is -45°C [-50°F] and notch toughness is required. They are normally supplied in nominal pipe sizes (NPS) and nominal wall thicknesses with schedule numbers in accordance with ASME B36.10M. They are often joined with flanges to ASTM A350 LF2 and butt-weld pipe fittings to ASTM A420 WPL6. Seamless tubes to ASTM A333 Gr.6 are mainly used in the construction of pipelines for the production of ethylene, propylene, urea, ammonia and N-P-K compound fertilisers. They can be used in scrubbing, cleaning, desulphurisation and degreasing processes in the oil and gas, petrochemical, coal and pharmaceutical industries. They can also be used in the manufacture of cryogenic equipment and cold stores.
Chemical Composition
| Element | Composition, wt. % |
|---|---|
| C | ≤0.30 |
| Mn | 0.29-1.06 |
| P | ≤0.025 |
| S | ≤0.025 |
| Si | ≥0.10 |
| Ni | ≤0.40 |
| Cr | ≤0.30 |
| Cu | ≤0.40 |
| V | ≤0.08 |
| Nb | ≤0.02 |
| Mo | ≤0.12 |
In terms of influence on low temperature impact toughness, phosphorus (P) is the most detrimental element among C, Si, P, Si and N for Charpy toughness of ASTM A333 Gr.6. Its amount should be reduced to the minimum. Manganese, as well as the addition of small traces of nickel, vanadium, copper and niobium, can significantly reduce the critical brittle-ductile transition temperature and refine the grain, thereby improving impact toughness.
Mechanical Properties at Room Temperature
| Tensile Properties | Requirements (Longitudinal) | Requirements (Transverse) |
|---|---|---|
| Tensile Strength min. MPa [ksi] | 415 [60] | 415 [60] |
| Yield Strength min. MPa [ksi] | 240 [35] | 240 [35] |
| Elongation in 2″, min. % | 30 | 16.5 |
Part of our product testing process
The ASTM A333 Gr.6 seamless pipe can be normalized by heating the pipe to a uniform temperature of no less than 1500°F [815°C] and cool in air. Or it can be heat treated by heating the pipe to a uniform temperature of no less than 1500°F [815°C], followed by quenching in liquid and reheating to a suitable tempering temperature.
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 |
Manufacture & Heat Treatment
The ASTM A333 Gr.6 seamless pipes can be manufactured by the seamless process from scratch: EAF melting ➡ ladle furnace remelting ➡ VOD ➡ continuous casting ➡ blooming ➡ bright annealing ➡ piercing ➡ cold drawn ➡ heat treatment ➡ straightening & cutting ➡ NDT (ET & UT) ➡ visual examination & dimensional inspection ➡ properties inspection ➡ packaging.
C&N HongCheng has great expertise in the manufacture of ASTM A333 Gr.6 seamless steel pipes. Contact us now for an inquiry!
