Manufacturing and process innovation, combined with a wide product range, are the two levers that have positioned our company with stainless steel flat and tubes production to be a market reference point in a multitude of industry sectors and in particular for the automotive industry. The always ongoing cooperation with Centro Sviluppo Materiali, allows us to maintain our highest quality standards consistent and in harmony with the most stringent market and regulatory standards. The tubes are welded longitudinally by an electric arc without adding any weld material (TIG. GTAW) or by high frequency induction welding (HF) or by laser welding. The external and internal weld bead is then removed. Our production lines can indifferently weld stainless steels of the 300 and 400 series, with a wide variety of thicknesses and diameters for any lengths that may be required by our customers and always respecting our standards of excellence in quality and services. Our superior craftsmanship has in few years positioned the our company as a market leader in the exhaust system industry.
Stainless Steel Grades for Tubes Manufacturing
Quality is the constant and main value in all of our manuf acturing cycle and includes research and implementation of the best austenitic and ferritic stainless steels for the most important and widespread market applications.
| FERRITIC GRADES | |||||||||||||||
| FERRO CHROME |
FERRO CHROME STABILIZED |
FERRO CHROME STABILIZED SUPER FERRITIC |
FERRO CHROME MOLYBDENUM |
||||||||||||
| ACCIAI SPECIALI TERNI | STR 12 | 409 LI | 439 M | 441 LI | 470 LI | 4513 | |||||||||
| EN 10088-2 | 1.4003 | 1.4512 | 1.4510 | 1.4509 | 1.4613 | 1.4513 | |||||||||
| TYPICAL COMPOSITION |
C | 0.02 | 0.01 | 0.02 | 0.02 | 0.01 | 0.02 | ||||||||
| Cr | 11.3 | 11.5 | 17.7 | 18.2 | 24.0 | 16.3 | |||||||||
| Ni | 0.5 | – | – | – | – | – | |||||||||
| Mo | – | – | – | – | – | 1,2 | |||||||||
| Others | – | Ti | Ti, Nb | Ti, Nb | Ti, Nb | Ti | |||||||||
| MECHANICAL PROPERTIES AT 20 °C – TYPICAL VALUES |
0.2% Yield Strength MPa | 320 | 250 | 280 | 300 | 330 | 300 | ||||||||
| 0.2% Rm Tensile Strength MPa | 500 | 420 | 450 | 470 | 490 | 470 | |||||||||
| Elongation A% A80 (thickness < 3mm) A5 (thickness ≥ 3mm) |
23 | 32 | 28 | 30 | 30 | 28 | |||||||||
| CORROSION RESISTANCE |
General | ° | ° | + | + | +++ | ++ | ||||||||
| Pitting | ° | + | + | ++ | +++ | ++ | |||||||||
| SCC | + | + | ++ | ++ | +++ | ++ | |||||||||
| Heat resistence | ° | ++ | ++ | +++ | +++ | + | |||||||||
| COLD FORMABILITY | + | ++ | ++ | ++ | ++ | ++ | |||||||||
| WELDABILITY | ++ | +++ | +++ | +++ | +++ | +++ | |||||||||
| AUSTENITIC | |||||||||||||
| FERRO CHROME NICKEL |
FERRO CHROME NICKEL MOLYBDENUM |
HEAT RESISTANT | |||||||||||
| ACCIAI SPECIALI TERNI | 304 | 304 DL | 321 | 316 | 316 L | 316 Ti | 4828 | ||||||
| EN 10088-2 | 1.4301 | 1.4307 | 1.4541 | 1.4401 | 1.4404 | 1.4571 | 1.4828 | ||||||
| TYPICAL COMPOSITION |
C | 0.04 | 0.025 | 0.05 | 0.06 | 0.03 | 0.05 | 0.05 | |||||
| Cr | 18.2 | 18.2 | 17.3 | 16.7 | 16.7 | 16.7 | 19.3 | ||||||
| Ni | 8.1 | 8.1 | 9.1 | 10.6 | 10.3 | 10.6 | 11.1 | ||||||
| Mo | – | – | – | 2,1 | 2,1 | 2,1 | – | ||||||
| Others | – | – | Ti | – | – | Ti | Si | ||||||
| MECHANICAL PROPERTIES AT 20 °C – TYPICAL VALUES |
0.2% Yield Strength MPa | 270 | 250 | 250 | 300 | 270 | 270 | 290 | |||||
| 0.2% Rm Tensile Strength MPa | 650 | 630 | 590 | 610 | 580 | 580 | 640 | ||||||
| Elongation A% A80 (thickness < 3mm) A5 (thickness ≥ 3mm) |
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
