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Standard ASTM A334
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ASTM A334 Standard Specification for Seamless and Welded Carbon and Alloy-Steel Tubes for Low-Temperature Service
Standard: ASTM A334, ASME SA334
Equivalent Standard: NBR 5605
Material: SA334 Grade 6
Chemistry Composition
C, %
Mn, %
Si, %
P, %
S, %
0.30 max
0.29-1.06
0.10 min
0.025 max
0.025 max
Mechanical Properties
Tensile Strength , MPa
Yield Strength, MPa
Elongation, %
Hardness, HB
415 min
240 min
30 min
190 max
Outside Diameter & Tolerance
Hot rolled
Outside Diameter, mm
Tolerance, mm
OD≤101.6
+0.4/-0.8
101.6<OD≤190.5
+0.4/-1.2
190.5<OD≤228.6
+0.4/-1.6
Cold Drawn
Outside Diameter , mm
Tolerance, mm
OD<25.4
±0.10
25.4≤OD≤38.1
±0.15
38.1<OD<50.8
±0.20
50.8≤OD<63.5
±0.25
63.5≤OD<76.2
±0.30
76.2≤OD≤101.6
±0.38
101.6<OD≤190.5
+0.38/-0.64
190.5<OD≤228.6
+0.38/-1.14
Wall thickness & Tolerance
Hot rolled
Outside Diameter , mm
Tolerance, %
OD≤101.6, WT≤2.4
+40/-0
OD≤101.6, 2.4<WT≤3.8
+35/-0
OD≤101.6, 3.8<WT≤4.6
+33/-0
OD≤101.6, WT>4.6
+28/-0
OD>101.6, 2.4<WT≤3.8
+35/-0
OD>101.6, 3.8<WT≤4.6
+33/-0
OD>101.6, WT>4.6
+28/-0
Cold Drawn
Outside Diameter , mm
Tolerance, %
OD≤38.1
+20/-0
OD>38.1
+22/-0
ASTM A334/A334M specification covers several grades of minimum wall-thickness, seamless and welded, carbon and alloy-steel tubes intended for use at low temperatures. Some product sizes may not be available under this specification because heavier wall thicknesses have an adverse affect on low-temperature impact properties.
Manufacture: the tubes shall be made by the seamless process and shall be either hot-finished or cold-finished, as specified.
Heat Treatment: all seamless tubes shall be treated to control their microstructure in accordance with one of the following methods:
a: Normalize by heating to a uniform temperature of not less than 1550 °F [845 °C] and cool in air or in the cooling chamber of an atmosphere controlled furnace.
b: Reheat and control hot working and the temperature of the hot-finishing operation to a finishing temperature range from 1550 to 1750 °F [845 to 955°C] and cool in a controlled atmosphere furnace from an initial temperature of not less than 1550 °F [845 °C].
Inspection & Test: chemistry composition analysis, tension test, flattening test, flaring test, hardness test, impact test, NDT, surface inspection and dimension check.
Length: 5800mm; 6000mm; 6096mm; 7315mm; 11800mm; and so on.
Max length: 30000mm, also U bending can be offered.
Keyword: seamless steel pipe, seamless steel tube, low carbon steel tube, ASTM A334, ASME SA334
 
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