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ASTM A 334M-89 / ASME SA 334

SEAMLESS AND WELDED CARBON AND ALLOY STEEL TUBES 

FORLOW TEMPERATURE SERVICE

This standard is issued under the fixed designation A 334/A 334M; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon ( ε) indicates an editorial change since the last revision or reapproval. 

1.Scope 

1.1 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. 

1.2 Supplementary Requirement S1 of an optional nature is provided. This shall apply only when specified by the purchaser. 

NOTE 1 ? For tubing smaller than 1/2 in. [12.7 mm] in outside diameter, the elongation values given for strip specimens in Table 1 shall apply.

Mechanical property requirements do not apply to tubing smaller than 1/8 in. [3.2 mm] in outside diameter and with a wall thickness under 0.015 in. [0.4 mm]. 1.3 The values stated in either inch-pound units or SI units are to be regarded separately as standard. 

Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; 

therefore, each system must be used independently of the orther. 

Combining values from the two systems may result in nonconformance with the specification. 

The inch-pound units shall apply unless the "M" designation of this specification is specified in the order. Chemical Requirements

Element Composition,%
Grade 1 Grade 3 Grade 6A Grade 7 Grade 8 Grade 9 Grade 11
Carbon,max 0.30 0.19 0.30 0.19 0.13 0.20 0.10
Manganese 0.40-1.06 0.31-0.64 0.29-1.06 0.90max 0.90max 0.40-1.06 0.60max
Phosphorus,max 0.025 0.025 0.025 0.25 0.025 0.025 0.025
Sulfur,max 0.025 0.025 0.025 0.25 0.025 0.025 0.025
Silicon ... 0.18-0.37 0.10min 0.13-0.32 0.13-0.32 ... 0.35max
Nickel ... 3.18-3.82 ... 2.03-2.57 8.40-9.60 1.60-2.24 35.0-37.0
Chromium ... ... ... ... ... ... 0.50max
Copper ... ... ... ... ... 0.75-1.25 ...
Aluminum ... ... ... ... ... ... ...
Coabalt ... ... ... ... ... ... 0.50max
Molybdenum ... ... ... ... ... ... 0.50max



A For each reduction of 0.01 % carbon below 0.30%, an increase of 0.05% manganse above 1.06%

will be permitted to a maximum of 1.35% manganese. 

Heat - Treatment Lot

Size of Tube Size of Lot
2 in.[50.8mm] and over in outside diameter and 0.200 in.[5.1mm] and over in wall thickness not more than 50 tubes
Under 2 in.[50.8mm] but over 1 in.[25.4mm] in outside diameter, 
or over 1 in. [25.4mm] in outside diameter and under 0.200 in.[5.1mm] in thickness
not more than 75 tubes
1 in.[25.4mm] or under in outside diameter not more than 125 tubes


Tensile Requirements.

  Grade 1 Grade 3 Grade 6 Grade 7 Grade 8 Grade 9 Grade 11
ksi MPa ksi MPa ksi MPa ksi MPa ksi MPa ksi MPa ksi MPa
Tensile Strength, min... 55 380 65 450 60 415 65 450 100 690 63 435 65 450
Yield Strength, min....... 30 205 35 240 35 240 35 240 75 520 46 315 35 240
Elongation in 2 in. or 50mm
(or 4D) min.%;
Basic minimum elongation for
walls 5/16 in.[8mm] and over
in thickness, strip tests, and
for all small sizes tested in full section
35 30 30 30 22 28 18A
When standard round 2-in. or 
50mm gage length equal to 4D 
(t times the diameter) is used
28 22 22 22 16 ... ...
For strip 1.75B 1.50B 1.50B 1.50B 1.25B 1.50B ...




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

B The following table gives the calculated minimum values : 

Wall Thickness Elongation in 2 in. or 50mm, min%C
in. mm Grade 1 Grade 3 Grade 6 Grade 7 Grade 8 Grade 9
5/16(0.312) 8 35 03 30 30 22 28
9/32(0.281) 7.2 33 28 28 28 21 26
1/4(0.250) 6.4 32 27 27 27 20 25
7/32(0.219) 5.6 30 26 26 26 18 24
3/16(0.188) 4.8 28 24 24 24 17 22
5/32(0.156) 4 26 22 22 22 16 20
1/8(0.125) 3.2 25 21 21 21 15 19
3/32(0.094) 2.4 23 20 20 20 13 18
1/16(0.062) 1.6 21 18 18 18 12 16




CCalulated elongation requirements shall be rouded to the nearest whole number.

NOTE - The above table gives the computed minimum elongation values for each 1/32-in.[0.8mm] in wall thcikness. 

Where the wall thickness lies between two values shown above,

the minimum elongation value is determined by the followin gequations : 

Grade Equation
1 E = 56t + 17.50 [E = 2.19t + 17.50]
3 E = 48t + 15.00 [E = 1.87t + 15.00]
6 E = 48t + 15.00 [E = 1.87t + 15.00]
7 E = 48t + 15.00 [E = 1.87t + 15.00]
8 E = 40t + 9.50 [E = 1.56t + 9.50]
9 E =48t + 13.00 [E = 1.87t + 13.00]


where : E = elongation in 2 in. or 50mm,% and

t = actual thickness of specimen, in.[mm].Maximum Hardness Number 

Grade Rockwell Brinell
1 B 85 163
3 B 90 190
6 B 90 190
7 B 90 190
8 ... ...
11 B 90 190



Impact Reuqirements for Grades 1, 3, 6, 7, and 9
 

Size of
Specimen, mm
Minimum Average Notched Bar Impact
Value of Each Set of Three Specimens
Minimum Notched Bar Impact Value
of One Specimen Only of a SetA
ft.lbf J ft.lbf J
10 by 10 13 18 10 14
10 by7.5 10 14 8 11
10 by 6.67 9 12 7 9
10 by 5 7 9 5 7
10 by 3.33 5 7 3 4
10 by 2.5 4 5 3 4



AStraight line interpolation for intermediate values is permitted.


Impact Temperature


Grade Impact Test Temperature
? ?
1 -50 -45
3 -150 -100
6 -50 -45
7 -100 -75
8 -320 -195
9 -100 -75



Impact Temperature Reduction
 

Specimen Width Along Notch or Actual Material ThicknessA Temperature Reduction, Degrees Colder
Inches Millimetres ? ?
0.394 10 (standard size) 0 0
0.354 9 0 0
0.315 8 0 0
0.295 7.5(3/4 standard size) 5 3
0.276 7 8 4
0.262 6.67(2/3 standard size) 10 5
0.236 6 15 8
0.197 5(1/2 standard size) 20 11
0.158 4 30 17
0.131 3.3.(1/3 standard size) 35 19
0.118 3 40 22
0.099 2.5(1/4 standard size) 50 28


A Straight line interpolation for intermediate values is permitted. Material Comparison Tables (ASTM →KS, JIS, DIN, BS, NBN, NF, UNI)

ASTM
STANDARD
UNS NO. KOREA/ JAPANES GERMAN BRITISH FRENCH ITALIAN
KS/JIS Symbol KS/JIS Numbe Remarks DIN Type DIN No Materiral No Remarks B.S No B.S Grade AFNOR Type NF No UNI Type UNI No Ramarks
A 334 Seamless and Welded C-ans Alloy Steel Tubes for Low-Tempersture Service
Grade 1 K03008 STLT 39 / STbL 380 D3571 / G 3464   TT St 41N 1.0437 WBL-680(3b) TU 42 BT A49-230 C 15 5949 (6)Seamless Only
Grade 3 K31918 STLT 46 / STBL 450 D3571 / G 3464   10 Ni 14 1.5637 WBL-680(3b) 3603 HFS 503 LT 100 TU 16 N 14 A49-230 18 Ni 14 5949 Seamless Only
Grade 6 K03006 (3) TT St 45 N 1.0456 WBL-680(3b) 3603 HFS 410 LT 50 TU A 42 BT A49-230 C 20 5949 Seamless Only
Grade 8 K31340 STLT 70 / STBL 690 D3571 / G 3464   X8 Ni 9 1.5662 WBL-680(3b) 3603 HFS 590 LT 196 TU Z 11 N 9 A49-230 12 X Ni 09 5949 Seamless Only

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