TUBES

TUBES

STAINLESS STEEL GRADES FOR TUBES MANUFACTURING

FERRITIC AUSTENITIC
FERRO CHROME FERRO CHROME STABILIZED FERRO CHROME STABILIZED
SUPER FERRITIC
FERRO CHROME MOLYBDENUM FERRO CHROME NICKEL FERRO CHROME NICKEL MOLYBDENUM HEAT RESISTANT
STR 12 409 LI 439 M 441 LI 470 LI 4513 304 304 DL 321 316 316 L 316 Ti 4828
EN 10088-2 1,4003 1,4512 1,4510 1,4509 1,4613 1,4513 1,4301 1,4307 1,4541 1,4401 1,4404 1,4571 1,4828
TYPICAL COMPOSITION C 0,02 0,01 0,02 0,02 0,01 0,02 0,04 0,025 0,05 0,06 0,03 0,05 0,05
Cr 11,3 11,5 17,7 18,2 24,0 16,3 18,2 18,2 17,3 16,7 16,7 16,7 19,3
Ni 0,5 8,1 8,1 9,1 10,6 10,3 10,6 11,1
Mo 1,2 2,1 2,1 2,1
Others Ti Ti, Nb Ti, Nb Ti, Nb Ti Ti Ti Si
MECHANICAL PROPERTIES AT 20 °C – TYPICAL VALUES 0.2% Yield Strength Mpa 320 250 280 300 330 300 270 250 250 300 270 270 290
Rm tensile Strength MPa 500 420 450 470 490 470 650 630 590 610 580 580 640
Elongation A%
A80 (thickness <3mm) A5 (thickness ≥3mm)
23 32 28 30 30 28 54 54 57 50 52 55 55
CORROSION RESISTANCE General ° ° + + +++ ++ ++ ++ +++ +++ +++ +++ +++
Pitting ° + + ++ +++ ++ ++ ++ +++ +++ +++ +++ ++
SCC + + ++ ++ +++ ++ ° ° ° ° ° ° °
Heat resistence ° ++ ++ +++ +++ + ++ ++ +++ ++ ++ ++ +++
COLD FORMABILITY + ++ ++ ++ ++ ++ ++ ++ +++ ++ +++ +++ +
WELDABILITY ++ +++ +++ +++ +++ +++ +++ ++++ +++ +++ ++++ ++++ +++

The above table reports the main stainless steels produced and traded by Acciai Speciali Terni for tubes production
The above mentioned figures, which refer to 1 mm CR, 2B finish, are approximate; they can vary according to thickness and finishing
° Not applicable/not required
+ Acceptable
++ Good
+++ Excellent
++++ Superior performance

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ORNAMENTAL AND DECORATIVE TUBES

RECTANGULAR TUBES
SECTION
(mm)
THICKNESS (mm)
1,0 1,2 1,5 2,0 3,0
THEORETICAL WEIGHTS kg/m
20×10 0,453 0,538 0,661
20×15 0,533 0,634 0,781 1,813
25×15 0,729
30×15 1,020 1,335
30×20 0,772 0,921 1,140 1,495
40×15 1,259 1,654
40×20 1,112 1,379 1,813
40×30 1,303 1,618 2,132 3,156
50×20 1,303 1,618 2,132 3,156
50×25 1,737 2,292
50×30 1,857 2,451
50×40 2,096 2,770
60×20 1,857 2,451
60×30 2,096 2,770 4,080
60×40 2,336 3,089 4,558
80×40 2,813 3,726 5,515
80×60 3,291 4,364 6,471
100×40 4,364 6,471
100×50 4,683 6,949
100×60 5,001 7,427
120×40 5,001 7,427
120×60 5,639 8,384
120×80 6,277 9,340
150×50 6,277 9,340
150×100 7,871 11,731
160×80 7,552 11,253
SQUARE TUBES
SECTION
(mm)
THICKNESS (mm)
1,0 1,2 1,5 2,0 3,0 4,0
THEORETICAL WEIGHTS kg/m
10×10 0,294
12×12 0,358 0,415 0,508
15×15 0,453 0,538 0,661
20×20 0,613 0,729 0,900 1,176
25×25 0,772 0,921 1,140 1,495
30×30 0,932 0,112 1,379 1,813 2,645
35×35 1,091 1,303 1,618 2,132 3,124
40×40 1,250 1,494 1,857 2,451 3,602
45×45 2,097 2,770
50×50 1,878 2,335 3,089 4,558
60×60 2,814 3,726 5,515
80×80 3,771 5,003 7,427
100×100 6,279 9,340 no
120×120 7,555 11,253 14,905
150×150 14,129

INDUSTRIAL TUBES

WELDED ROUND TUBES WITH METHOD TIG/LASER IN ACCORDANCE EN 10271-7 – TC1
DIAMETER
FROM 6 TO 35 mm
THICKNESS (mm)
1,0 1,2 1,5 2,0 2,5 3,0
THEORETICAL WEIGHTS kg/m
6,0 0,125
8,0 0,175 0,244
10,0 0,225 0,264 0,319
12,0 0,275 0,394
14,0 0,326 0,385 0,469
15,0 0,351 0,415 0,507
16,0 0,376 0,445 0,545 0,701
17,2 0,597 0,761
18,0 0,426 0,505 0,620 0,804
20,0 0,476 0,565 0,695 0,901
21,3 0,508 0,604 0,744 0,966 1,177 1,375
22,0 0,526 0,625 0,770 1,002
25,0 0,601 0,715 0,883 1,152
26,9 0,648 0,772 0,954 1,247 1,527 1,795
28,0 0,676 0,805 0,995 1,302
30,0 0,726 0,865 1,070 1,402 1,722 2,028
32,0 0,776 0,925 1,146 1,502
33,0 1,183 1,552
33,7 0,977 1,209 1,588 1,953 2,306

WELDED ROUND TUBES WITH METHOD TIG/LASER IN ACCORDANCE EN 10271-7 – TC1
DIAMETER
FROM 35 TO 450 mm
THICKNESS (mm)
1,0 1,2 1,5 2,0 2,5 3,0
THEORETICAL WEIGHTS kg/m
35 0,851 1,016 1,258 1,653
38 0,926 1,106 1,371 1,803
40 0,977 1,166 1,446 1,903 2,779
42,4 1,037 1,238 1,536 2,023 2,498 2,960
45 1,102 1,316 1,634 2,153
48,3 1,184 1,415 1,758 2,319 2,867 3,403
50 1,227 1,466 1,822 2,404
52 1,277 1,526 1,897 2,504
54 1,327 1,586 1,972 2,604
60,3 1,485 1,776 2,208 2,919 4,304 5,639
63,5 1,872 2,329 3,080
70 2,573 3,405
76,1 2,802 3,711 5,491
80 2,948 3,906
84 4,107
88,9 3,283 4,352 5,409 6,453
101,6 3,760 4,988
104,0 5,108
114,3 4,237 5,624 6,999 8,361
129,0 6,360 9,465
139,7 5,191 6,896 10,269
154,0 7,612
168,3 8,328 10,379 12,417
204,0 10,116
206,0 15,249
219,1 10,872 16,233
254,0 12,620 18,855
256,0 19,005
273,0 13,572 16,933
304,0 15,124
306,0 22,761
323,9 16,121 20,120 28,873
355,6 17,708 22,104 26,487
406,4 20,252 30,303

GENERAL TOLERANCES

MECHANICAL PROPERTIES OF THE TUBES
REFERENCE NORMS GUARANTEED TYPICAL
AISI 409 LI
W 1.4512
Rp02 (MPa) > 210 > 205 330
Rm (MPa) > 380 400÷500 420
A5 (%) > 25 > 30 36÷38
AISI 441
W 1.4509
AISI 439
W 1.4510 etal.
Rp02 (MPa) > 230 > 300 380
Rm (MPa) > 420 > 450 490
A5 (%) > 20 > 28 32÷34
W 1.4003 Rp02 (MPa) > 280 > 300 350
Rm (MPa) > 450 > 450 480
A5 (%) > 20 > 20 22
DIMENSIONAL TOLERANCES FOR ROUND COMMERCIAL-LENGTH TUBES
GUARANTEED VALUES TYPICAL VALUES NOTES
Thickness +/- 10% with min ± 0,2 +1 / – 7%
Diameter +/- 0,75% with ± 0,3 + 0,10 / – 0,20 mm
Length – 0 / + 50 mm – 0 / + 50 mm
Internal bead – 0 / +10% max 0,20 mm max 0,10 mm
Linearity 2,0 mm/m 1,0 mm/m
DIMENSIONAL TOLERANCES FOR FIX-LENGTH TUBES
GUARANTEED VALUES TYPICAL VALUES NOTES
Length – 0 / + 1 mm 0,50 mm upon request +/- 0,5 mm
Ovality on the cut 0,60 mm 0,30 – 0,40 mm Dmax – Dmin (*) at 1 D from cut end
TECHNOLOGICAL TEST ON THE EXHAUST SYSTEM TUBE AISI 409 LI / W 1.4512
REFERENCE NORMS GUARANTEED TYPICAL
Flattening test 2xT + 16 mm 2xT + 16 mm 2xT
Cone expansion 30% 30% 30%
Radial expansion 20% 30%
DIMENSIONAL TOLERANCES ORNAMENTAL TUBES
Thickness ± 10%
Dimensions base and height ± 0,50 %
Length – 0 + 50 mm
Thickness of the weld bead – 0 / +10% of the thickness; max 0,20 mm
Linearity ≤ 2,0 mm per meter
Torsion ≤ 2,0 mm for the first meter then 0,5 mm for the following
Radius of the corners 1,2 x T +/- 20% (thickness ≤ 2,0 mm)
2,0 x T +/- 20% (thickness > 2,0 mm)
Burr max 1,0 mm per thickness ≥ 2,5 mm max 0,2 mm per thickness < 2,5 mm

T = Thickness

AUSTENITIC GRADES

MECHANICAL PROPERTIES OF THE ROUND TUBES
REFERENCE NORMS GUARANTEED TYPICAL
Rp02 (MPa) > 200 > 300 400
Rm (MPa) > 500 > 550 600
A5 (%) > 40 > 40 50÷55
Hv 5 < 220 < 220 < 220

T = Thickness

TECHNOLOGICAL TEST ON THE TUBES
REFERENCE NORMS GUARANTEED TYPICAL
Flattening test 2xT + 16 mm 2xT 2xT
Cone expansion 40% 40% 50%
Radial expansion 30% 33 – 35%

T = Thickness

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