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 Seamless Steel 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,






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


 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