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ASTM A334 Seamless And Welded Carbon And Alloy Steel Tubes

ASTM A334 Seamless And Welded Carbon And Alloy Steel Tubes

This 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.

Description

1.Chemical composition


Elementcomposition %
Grade1Grade3Grade6Grade7Grade8
Grade9

Grade1

1

C  max0.300.190.300.190.130.200.10
Mn  0.40-1.060.31-0.640.29-1.060.90max0.90max0.40-1.060.60 max
P  max0.0250.0250.0250.250.025
0.0250.025
S  max0.0250.0250.0250.250.0250.0250.025
Si...0.18-0.370.10min0.13-0.320.13-0.32...0.35 max
Ni...3.18-3.82...2.03-2.578.40-9.601.60-2.240.35-0.37
Cr
..................0.5 max
Cu...............0.75-1.25...
Al
..................
...
Co..................0.5 max
Mo
..................0.5 max

2.Mechanical property



Grade 1
Grade3Grade6Grade7Grade8Grade9Grade11

Mpa

MpaMpaMpa
MpaMpaMpa

Tensile Strength min


380
450
415450690
435450
Yield strength in 2 in min %205240
240
240520315240
basic minimum elongation for walls  8mm and over in thickness  strip tests and for all small sizes tested in full section35303030222818A
When standard round 50mm gage length equal to 4D is used28
22222216......

AElongation of Grade 11 is for all walls and for small sizes tested in full section.


3.Marking 

According to standard or per customer request.


4.Packing

(1) In loose

(2) In bundles up to 2000 kg tied in minimum six places with rope

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