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X39CrMo17-1 - Nr.1.4122

Steel similar to 420C but with the addition of molybdenum, which increases its resistance to corrosion at high temperature.

References and Comparable Standards

Standard Reference: EN 10088-3: 2014 (Hot-rolled and bright products)
EUROPE ITALY GERMANY FRANCE UK USA

EN 10088-3: 2005

(UNI 6900: 71)

(DIN 17440 - 85)

(NF A 35-574-90)

 (BS 970 pt. 3-91) AISI
Grade N°   Werkstoff N°      
X39CrMo17-1 1.4122 - - - - - -

Chemical Composition (Cast Analysis) (%)

C Si / max Mn / max P / max S / max Cr Mo Ni / max
0,33÷0,45 1,00 1,50 0,040 0,030 15,5÷17,5 0,80÷1,30 1,00

Mechanical Properties – Rough turned (1X) in the annealed condition

Size (mm) Heat treatment Hardness HB max* Rp 0,2 (MPa) min Rm (MPa) A5 (%) min
d≤100 Annealed (+A) 280 - 900 max -
d≤60 Quenched + Tempered (+QT 750) - 550 750÷950 15

* only for guidance

Mechanical Properties – Cold drawn (2H, 2B) and ground bars (2G) in the solution annealed condition

Size (mm) Annealed Quenched + Tempered
Rm (MPa) max HB max* Heat treatment Rp 0,2 (MPa) min Rm (MPa) max A5 (%) min** KV (J) min
d≤10 1000 340 Quenched + Tempered (+QT750) 650 800÷1050 8 -
10<d≤16 1000 340 600 800÷1050 8 -
16<d≤40 980 310 550 750÷1000 10 14
40<d≤63 930 290 550 750÷950 12 14
63<d≤100 900 280 550 750÷950 12 10

* for reference only
** values valid only for size ≥5 mm

Mechanical Properties – Cold drawn wire and coils (2H)

Tensile strength levels Rm (MPa)
+C 500 500÷700
+C 650 650÷850
+C 800 800÷1000
+C 900 900÷1100

Note: the desired tensile strength level shall be evaluated depending on diameter required

Mechanical Properties – Cold drawn wire and coils in the solution annealed condition (2D)

Size A (%) max Rm (MPa) max
0,50≤d≤1,00 10 1100
1,00≤d≤3,00 10 1050
3,00≤d≤5,00 10 1000
5,00≤d≤16,00 15 950

Note: If skin passed, Rm might be increased by up to 50 MPa

Working Temperatures Recommended

Operation °C
Hot forgings deformation 800÷1100
Annealing (furnace, air) 750÷850
Quenching in oil     980÷1060
Tempering (QT 750) 650÷750
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