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Petrochemical Products Group Pevely, Missouri Waukesha, WisconsinPhone 636-479-4499 Phone 262-544-7705Fax 636-479-3399 Fax 262-544-7884

25-35Nb is a niobium strengthened modification of 25-35 (HP) with enhanced stressrupture properties and weldability. Superior rupture strength is achieved throughutilization of state-of-the-art foundry practices. The Petrochemical Products Groupmanufactures several 25-35Nb variations with chemistries and properties designed forspecific customer applications.

25-35NbIssue: 17Date: 7 Feb 0

DATA SHEET

25-35Nb 

Description 

Chemical Composition Range 

Mechanical Properties 

Element (%) C Mn Si Cr Ni Nb Mo Fe

Minimum 0.35 — — 23.0 32.0 0.60 — Bal

Maximum 0.55 1.50 2.00 27.0 37.0 1.00 0.50 Bal

*Calculations based on 95% confidence limit.

TENSILE PROPERTIES

Minimum

Temperature °F

°C

7021

7021

1600870

20001093

Tensile Strength ksiMPa

65.0448

79.0545

25.0172

9.062

Yield Strength ksiMPa

33.0227

38.0262

18.0124

8.055

Elongation % 8 (Centrifugal)6 (Static Cast)

16 26 40

Typical

Minimum Stress toProduce Rupture

°F°C

1600870

1700927

1800980

19001040

10,000 hours ksiMPa

6.2543.1

4.3630.1

2.7318.8

1.5310.5

100,000 hours ksiMPa

4.8033.1

3.0220.9

1.6911.7

0.845.8

STRESS-RUPTURE PROPERTIES*

8/12/2019 25-35NB Datasheet - Rev 17

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1

10

100

1

10

100

30 31 32 33 34 35 36 37 38 39 40

30 31 32 33 34 35 36 37 38 39 40

   S   t  r  e  s  s   (   M   P  a   )

LMP = T (23.0 + log t) / 1000

   1   k  s   i  =   6 .   8

   9   5   M   P  a

LMP = Larson-Miller parameter 

  T = TemperatureoK (

oC +273.15)

  t = Hours to rupture

 Average

Minimum

(95% Confidence)

Petrochemical Products Group 

Physical Properties 

8600 Commercial BoulevardPevely, Missouri 63070-1528Phone 636-479-4499 Fax 636-479-3399 

CARONDELET CORPORATION

905 East St. Paul AvenueWaukesha, Wisconsin 53188-3898Phone 262-544-77005 Fax 262-544-7884 

Wisconsin entrifugal

©2001 MetalTek International

25-35NbIssue: 17Date: 7 Feb 02 

Density:  0.285 lb/in3  (7.90 g/cm

3 )

Melting Point:  2450°F (1343°C)

Temperature Conductivity

212°F (100°C) 80 BTU-in/ft2/hr/°F (11.5 W/m°C)

1600°F (870°C) 170 BTU-in/ft2/hr/°F (24.6 W/m°C)

2000°F (1093°C) 200 BTU-in/ft2/hr/°F (28.9 W/m°C)

Thermal Conductivity: 

Temperature Coefficient

70-1600°F (21-870°C) 10.0x10-6

 in/in/°F (18.0x10-6

 m/m/°C)

1600-1800°F (870-980°C) 10.3x10

-6

 in/in/°F (18.5x10

-6

 m/m/°C)1800-2000°F (980-1093°C) 10.6x10-6 in/in/°F (19.1x10-6 m/m/°C)

Thermal Expansion: 

Larson-Miller Creep-Rupture Curve