ASTM A333 Grade 6 Seamless Steel Pipe for Low-Temperature Service
ASTM A333 Grade 6 Seamless Steel Pipe for Low-Temperature Service
ASTM A333 Standard covers seamless and welded steel pipe for low temperature service. The Grade 6 steel involved is similar to AISI 4032 low alloy steel. ASTM A333 Grade 6 pipe shall be made by the seamless or welding process with the addition of no filler metal in the welding operation.
Seamless and Welded Steel Pipe size for Low-Temperature Service:
Outer Dimensions : 19.05mm – 114.3mm
Wall Thickness:2.0mm – 14 mm
Length : max 16000mm
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.
Chemical requirement Composition(%)
| Composition | ASTM A333 Grade 6 |
| Carbon, max | 0.30 |
| Manganese | 0.29–1.06 |
| Phosphorus, max | 0.025 |
| Sulfur, max | 0.025 |
TENSILE REQUIREMENTS
| Data | ASTM A333 Grade 6 |
| Tensile strength, min, psi (MPa) | 60 000 (415) |
| Yield strength, min, psi (MPa) | 35 000 (240) |
Principal Design Features : This specification covers seamless and welded steel pipe for low temperature service.
Applications : Used for low temperature service piping down to minus 50 F.
Machinability :Machinability is good, similar to law alloy 4032 steel.
Forming : The product comes in piping form but may be formed readily by conventional methods.
Welding : Weldable by conventional methods.
Heat Treatment : Product is supplied in the normalized, 1500 f and air cooled, condition. It may be quenched and tempered by heating to 1475 F, quench in circulating water and then temper by re-heating to 1100 F and rapid air cooling.
Forging : Product is supplied in pipe form and not normally forged from that shape.
Hot Working : Hot working may be done qt 2000 F down to 1600 F if need be. Do not hot work below 1550 F and immediately following hot working cool in a controlled atmosphere furnace from a temperature above 1550 F.
Cold Working : Cold working may be done by conventional methods.
Annealing : Anneal, or normalize, at 1600 F and air cool.
Aging : Not applicable.
Tempering : See “Heat Treatment”
Hardening : Hardens from cold working or heat treatment. See “Heat Treatment”.
Other Comments : Grade 6 is a low alloy steel similar to 4032 in properties.
Tensile strength requirement for Grade 6 is 60 ksi minimum and notched-bar impact strength is 4 to 13 ft. lbs. depending upon section size.
| Density (lb / cu. in.) | 0.284 |
| Specific Gravity | 7.9 |
| Specific Heat (Btu/lb/Deg F – [32-212 Deg F]) | 0.105 |
| Melting Point (Deg F) | 2750 |
| Thermal Conductivity | 360 |
| Mean Coeff Thermal Expansion | 6.3 |
| Modulus of Elasticity Tension | 30 |
| Modulus of Elasticity Torsion | 11 |
