MLX17TM - Aubert&Duval SiteIn the solution treated state the hardness is approximately 33 HRC. The graphs on the following page shows the typical properties. 106991_Brochure_MLX17.indd

MLX17TM

A very high strengthstainless steel

Enhancing your performance

CONTINUOUSMETALLURGICALINNOVATION

RESEARCH

SPECIAL STEELS

SERVICE

DEVELOPMENT

X1CrNiMoAlTi12-11-2

106991_Brochure_MLX17.indd 1 24/03/11 15:20

2

THE INDUSTRIAL ENVIRONMENT

Numerous applications require the use of stainless steel solutions. The ban of Cr and Cd plating has shifted the need towards higher strength stainless steels.

Aubert & Duval has therefore adapted its high strength steel offering with the development of MLX17,a high corrosion resistant grade capable of 1700 MPa (247 Ksi) with high fracture toughness and excellent corrosion resistance.

The Aubert & Duval stainless steels family and MLX17 show:

• High resistance

• High stress corrosion resistance

• Good fatigue behavior.

The Aubert & Duval high strength family offers a replacement for low carbon steels from AISI 4340 to 35NiCrMo16.

DEVELOPMENT OF THE GRADE MLX17

The following criteria have been taken into account for the development of this grade:

• Capable of 1700 MPa (247 Ksi) with a minimum dispersion: Al and Ti are used for hardening,

• High ductility, fracture toughness and stress corrosion resistance. The Ni content is pushed to its optimum,

• Capable of very large parts with the possibility to refi ne the grain size of die forged parts during heat treatment: a low solutionning temperature is preferred,

• Weldable and easily machined: a PH grade.

MLX17 X1CrNiMoAlTi12-11-2

UNS: S11100AMS 5937


3

APPLICATIONS

• Structural parts for the aerospace industry (landing gears, actuators, fl aps, rod ends, …)

• Medical devices

• Fasteners

• Marine applications: landing grids, …

• Defense

CHEMICAL COMPOSITION

C Si Mn Cr Mo Ni Al Ti

min. -- -- -- 11.00 1.75 10.25 1.35 0.20

max. 0.02 0.25 0.25 12.50 2.25 11.25 1.75 0.50

SPECIFICATIONS

• X1CrNiMoAlTi12-11-2

• UNS: S11100

• AMS: 5937


UNS: S11100AMS 5937


4


UNS: S11100AMS 5937

PHYSICAL PROPERTIES

Density

Temperature Aged 510 °C / 950 °F Aged 540 °C / 1000 °F

°C °F g/cm3 lb/in3 g/cm3 lb/in3

20 68 7.67 0.2769 7.67 0.2769

100 212 7.66 0.2765 7.66 0.2765

150 302 7.65 0.2762 7.64 0.2758

200 392 7.63 0.2755 7.63 0.2755

250 482 7.62 0.2751 7.62 0.2751

300 572 7.60 0.2744 7.60 0.2744

350 662 7.59 0.2740 7.59 0.2740

400 752 7.58 0.2736 7.58 0.2736

430 806 7.57 0.2733 7.57 0.2733

Mean coeffi cient of thermal expansion

Temperature range Aged 510 °C / 950 °F Aged 540 °C / 1000 °F

°C °F 10-6/m/m/°C 10-6/in/in/°F 10-6/m/m/°C 10-6/in/in/°F

25/100 77/212 10.32 5.73 10.38 5.77

25/150 77/302 10.70 5.94 10.79 5.99

25/200 77/392 11.05 6.14 11.14 6.19

25/250 77/482 11.26 6.26 11.36 6.31

25/300 77/572 11.40 6.33 11.51 6.39

25/350 77/662 11.52 6.40 11.63 6.46

25/400 77/752 11.61 6.45 11.75 6.53

25/430 77/806 11.68 6.49 11.83 6.57


5

Thermal conductivity

Temperature Aged 510 °C / 950 °F Aged 540 °C / 1000 °F

°C °F W.m/m2.°C Btu.in/hr.ft2.°F W.m/m2.°C Btu.in/hr.ft2.°F

20 68 17.3 119.5 15.9 110.2

100 212 18.0 124.7 17.5 120.9

150 302 18.8 130.2 18.6 128.9

200 392 18.9 130.9 19.5 134.8

250 482 19.8 137.2 20.3 140.7

300 572 20.1 139.2 20.5 142.1

350 662 21.0 145.5 21.1 145.9

400 752 21.7 150.0 22.1 152.8

430 806 23.0 159.3 22.7 157.0

Specifi c heat

Temperature range Aged 510 °C / 950 °F Aged 540 °C / 1000 °F

°C °F J/kg.°C Btu/lb/°F J/kg.°C Btu/lb/°F

20 68 481 0.12 489 0.12

100 212 510 0.12 508 0.12

150 302 522 0.13 524 0.13

200 392 536 0.13 539 0.13

250 482 556 0.13 557 0.13

300 572 568 0.14 569 0.14

350 662 592 0.14 593 0.14

400 752 616 0.15 621 0.15

430 806 658 0.16 650 0.16


UNS: S11100AMS 5937


6


UNS: S11100AMS 5937

TRANSFORMATION POINTS

Ms 133 °C / 271 °F

Mf 23 °C / 73 °F

MACROSTRUCTURE

The segregation observed on the ingots is well within the limits of aerospace industry requirements:

Class Type Severity

1234

FrecklesWhite spots

Radial segregationRing pattern

AAAB

Macrostructure according to ASTM A 604


7


UNS: S11100AMS 5937

MICROGRAPHIC CHARACTERIZATION

Aged Condition

The structure is very fi ne.

Typical aspect of the structure

30µm

100µm


8


UNS: S11100AMS 5937

MECHANICAL CHARACTERISTICS (DESIGN VALUES)

The grade is included in the MMPDS handbook.

MECHANICAL CHARACTERISTICS (TYPICAL)

Heat Treatment: • 840 °C / 1544 °F – 2 hrs – Oil or Water quench• Deep Freezing below -80 °C / -112 °F – 8 hrs• Aging

In the solution treated state the hardness is approximately 33 HRC.

The graphs on the following page shows the typical properties.


9


UNS: S11100AMS 5937

UTS

(M

Pa)

UTS

(K

si)

230

235

240

245

250

255

910 920 930 940 950 960 970 980 990 1000 1010

Aging Temperature (°F)

0

10

20

30

40

50

60

70

80

CVN / Aging 4 hours

CVN / Aging 8 hours

UTS / Aging 4 hours

UTS / Aging 8 hours

1580

1600

1620

1640

1660

1680

1700

1720

1740

1760

490 495 500 505 510 515 520 525 530 535 540 545

Aging temperature (°C)

0

20

40

60

80

100

120

CVN - KV / Aging 4 hours

CVN - KV / Aging 8 hours

UTS / Aging 4 hours

UTS / Aging 8 hours

Ch

arp

y V-

No

tch

imp

act

- K

V (

J)C

har

py

V-N

otc

h im

pac

t (f

t.lb

s)


10


UNS: S11100AMS 5937

Transition curves

KV

(J)

Ch

arp

y V

(ft

.lb)

0

20

40

60

80

100

120

-150 -100 -50 0 50 100 150

Temperature (°C)

0

10

20

30

40

50

60

70

80

-238 -138 -38 62 162 262

Temperature (°F)

Aged 510°C / 950°F(Long)

Aged 510°C / 950°F(Transverse)

Aged 540°C / 1000°F(Long)

Aged 540°C / 1000°F(Transverse)

Rm / UTS: 1572 MPa / 228 Ksi

Rm / UTS: 1724 MPa / 250 Ksi


11


UNS: S11100AMS 5937

Fatigue curves

MLX17 Aged 510 °C / 950 °F (H950)

Tensile fatigue – R = 0.1 – Kt = 1.035 (Medium = Air)

Str

ess

(Ksi

)S

tres

s (K

si)

100

120

140

160

180

200

220

240

260

280

300

1000 10000 100000 1000000 10000000

Number of cycles

690

890

1090

1290

1490

1690

1890

AISI 4340UNS S46500PH13-8MoMLX17

50

70

90

110

130

150

170

190

210

230

1000 10000 100000 1000000 10000000

Number of cycles

345

545

745

945

1145

1345

1545AISI 4340UNS S46500PH13-8MoMLX17

Str

ess

(Mp

a)S

tres

s (M

pa)

Tensile fatigue – R = 0.1 – Kt = 1.035 (Medium = NaCl solution)


12


UNS: S11100AMS 5937

AUBERT & DUVAL fatigue tests – rotative bending(r = -1), kt = 1.035

MLX17 Aged 510 °C / 950 °F (H950)

Ap

plie

d L

oad

(M

Pa)

500

550

600

650

700

750

800

850

900

950

1000

1050

1100

1150

1200

1,00E+04 1,00E+05 1,00E+06 1,00E+07 1,00E+08

Number of Cycles at Failure

σd = 760 MPa


13


UNS: S11100AMS 5937

MLX17 Aged 540 °C / 1000 °F (H950)

Ap

plie

d L

oad

(M

Pa)

400

450

500

550

600

650

700

750

800

850

900

950

1000

1050

1,00E+04 1,00E+05 1,00E+06 1,00E+07 1,00E+08

Number of Cycles at Failure

σd = 725 MPa


14


UNS: S11100AMS 5937

CORROSION RESISTANCE

General corrosion resistance

The corrosion resistance of MLX17 is similar to AISI 304 stainless.

Salt-spray tests (NF X 41-002) have not shown any sign of corrosion on:

• Aged + machined samples after 700 hrs

• Aged + passivated samples after 4000 hrs.

Example of results

Passivated samples – 673 hours

Stress corrosion resistance

Like the Aubert & Duval high strength stainless steel family, this grade has been developed to show excellent stress corrosion resistance.

Different tests have been carried out as no standard test exists to measure stress corrosion resistance.

Examples of results are given in the following tables extracted from US NAVY reportNAWCADPAX/TR-2009/12

PH13-8MoAged 538 °C / 1000 °F

UNS: S46500Aged 510 °C / 950 °F

MLX17Aged 510 °C / 950 °F

UTS (MPa / Ksi) 1480 / 215 1740 / 252 1710 / 248

Elongation (%) 14 13 14

HRC 44 48 48

K1c (MPa√m / Ksi√in) 97 / 88.3 90 / 82 80 / 72.9

K1scc (MPa√m / Ksi√in) 70 / 63.8 >53 / 48.3 68 / 61.9


15


UNS: S11100AMS 5937

NOTES:


The information and the data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested

for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied,

of fitness for these or other purposes.Aubert & Duval‘s liability shall not extend, under any circumstances,

to the choice of the Product and its consequences.

Design: Aubert & Duval© 02/2011

Contact us: www.aubertduval.com


Documents

MLX17TM - Aubert&Duval SiteIn the solution treated state the hardness is approximately 33 HRC. The graphs on the following page shows the typical properties. 106991_Brochure_MLX17.indd