Forterior


 

​Higher Strength for Higher Performance

When looking beyond Vallourec's family of standard high-strength steels for mechanical engineering applications, Forterior® is the first option you might consider. It has a higher yield strength (between 470 and 590 MPa, depending on steel grade) and good impact test values guaranteed up to -40 °C. The Forterior® series consists of five grades with specific mechanical properties (see table below).

 

Applications

Forterior® grades support the design of weight-optimized structures without compromising on performance. This means less material and thus lighter structures, or enhanced performance with the same total structure weight. Popular applications for Forterior® are highly stressed heavy-wall hydraulic cylinders and structural hollow sections (MSH) for agricultural machinery.

 

Chemical composition (in % by mass)​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​Steel grade C1) ​Si ​Mn ​P2) max. ​S2)
max.
​Cr max. ​Mo max. ​Ni max. ​Cu max. ​N max. ​Al ​V3) ​Nb3) max. Ti3) max.
​Forterior® 470 ​0.16 to 0.22 ​0.10 to 0.50 ​​1.30 to 1.70 0.030 0.035 0.30 0.08 0.40 0.25 0.020 ​0.010 to 0.060 ​0.08 to 0.15 0.05 0.03
​​Forterior® 450
ImpactFIT 20
​0.16 to 0.22 ​​0.10 to 0.50 ​​​1.30 to 1.70 0.030 0.035 0.30 0.08 0.40 0.25 0.020 0.010 to 0.060 ​0.08 to 0.15 0.05 0.03
​​Forterior® 450
ImpactFIT 30
​0.16 to 0.22 ​​0.10 to 0.50 ​​​1.30 to 1.70 0.030 0.035 0.30 0.08 0.40 0.25 0.020 ​0.010 to 0.060 0.08 to 0.15 0.05 0.03
​​Forterior® 590
ImpactFIT 40
​0.16 to 0.22 ​​0.10 to 0.50 ​​​1.30 to 1.70 0.030 0.035 0.30 0.08 0.40 0.25 0.020 ​0.010 to 0.060 0.08 to 0.15 0.05 0.03
​​Forterior® 630
ImpactFIT 401)
​0.16 to 0.22 ​​0.10 to 0.50 ​​​1.30 to 1.70 0.030 0.035 0.30 0.08 0.40 0.25 0.020 ​0.010 to 0.060 0.08 to 0.15 0.05 0.03

1) Forterior® 630 may contain up to 0.23 % C.
2) A restriction in terms of P max. 0.025 % and S max. 0.025 % can be agreed.
3) V+Nb max. 0.20 % and V+Nb+Ti max. 0.22 %.

 

​Mechanical properties
​Steel grade​ ​Delivery condition1) ​Yield strength
ReH min in MPa2)
​Tensile strength Rm in MPa2) ​Elongation Amin in % ​Min. average absorbed energy KV min. at given test temperature
long. transv.
​Forterior® 470 ​AR ​470 ​650 - 800 ​17 ​15 ​-
​Forterior® 450
ImpactFIT 20
​N ​450 ​600 - 750 ​19 ​17 ​27 J at -20 °C
​Forterior® 450
ImpactFIT 30
​N ​450 ​600 - 750 ​19 ​17 ​27 J at -30 °C
​Forterior® 590
ImpactFIT 40
​QT ​590 ​700 - 850 ​16 ​14 ​30 J at -40 °C
​Forterior® 630
ImpactFIT 40
​QT 630 ​740 - 930 ​16 ​14 ​27 J at -40 °C

1) AR: As rolled; N: normalized or normalizing formed; QT: quenched and tempered.
2) Values apply for the lowest wall thickness range defined in Vallourec materials datasheets. Please contact us for further information.

 

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