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Heat-Resistant Austenitic Stainless Steel
© 1997 , 2012 NIPPON STEEL & SUMITOMO METAL CORPORATION
http://www.nssmc.com/
STAINLESS
Heat-Resistant Austenitic Stainless Steel
(ASTM:UNS 31060)(NSSMC-NAR-AH-4)
S004en_01_201212f
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Alloy Design・Features Main Use Applications
Specification andPhysical Properties
Equivalent Specification●ASTM A240, A213 ●UNS S31060●ASME Code Case 2430 (ASME Section Ⅰ & Ⅷ, Div.1 Boiler and Pressure Vessel)
Table 1 : Chemical Composition (wt%)
Table 2 : Density, Specific Heat, Thermal Conductivity and Thermal Diffusivity
Table 4 : Poisson' s ratio
Table 3 : Linear Expansion Coefficient
Designation C Si Mn P S Cr Ni N other elements
NSSMC-NAR-AH-4 0.05〜0.10 ≦1.00 ≦1.00 ≦0.040 ≦0.030 22.00〜
24.0010.00〜12.00
0.18〜0.25
La+Ce0.03〜0.07
UNS S31060 0.05〜0.10 ≦0.50 ≦1.00 ≦0.040 ≦0.030 22.00〜
24.010.00〜
12.50.18〜0.25
La+Ce0.025〜0.070
B0.001〜0.010
(for reference)SUS 310S ≦0.08 ≦1.50 ≦2.00 ≦0.045 ≦0.030 22.00〜
26.0019.00〜22.00 ─ ─
Designation Density(g/cm3) Specific Heat(J/Kg・K)Thermal Conductivity(W/m・K)Thermal Diffusivity(cm2/sec)NSSMC-NAR-AH-4
UNS S31060 7.88 502 13.8 0.036(for reference)
SUS 310S 8.03 502 14.2 ─
Temperature(℃) 30-100 30-200 30-300 30-400 30-500 30-600 30-700 30-800 30-900 30-1000
Linear Expansion(×10−6/℃) 15.7 16.2 16.8 17.1 17.4 17.7 18.1 18.5 18.7 19.1
WeldabilityCreep RuptureStrength
MicrostructuralStability・Cost Saving
Oxidation Resistance・Erosion Resisitance
High Cr≧22.5% Solid solution strengthening:Addition of N
Grain boundary strengthening:Addition of B
0.3%Si -0.07%C -23%Cr -11%Ni -0.2%N -La+Ce -B
Addition of rareearth metals
Addition of N Decrease of Si
Optimization ofCreq / Nieq
Grain size control
❶ Alloy design of NSSMC-NAR-AH-4
❶ Specification
❷ Physical Properties
1 Parts requiring heat resistance in Industrial Furnaces, Heat-treating Furnaces, Power Plants and Chemical Plants.
2 Fuel cell reforming Tube. 3 Auto parts (Exhaust Manifold etc.). 4 Substitute for SUS310S. Especially suited for material requiring high-temperature mechanical strength.
Temperature(℃) RT 450 500 600 700 800 900 1000
Modulus of Elasticity(GPa) 188 158 154 146 138 130 128 119
Poisson' s ratio 0.260 0.260 0.260 0.262 0.263 0.263 ─ ─
●Lower sensitivity of weld hot cracking than SUS310S, especially favorable for thick plates welding.
❸ Superior Weldability
●Reasonably designed chemical composition as compared with SUS310S.
❹ Cost Saving
●Higher tensile strength and creep strength at high temperature than SUS310S (JIS G4303).
●Excellent oxidation resistance at 900〜1000℃ superior to SUS310S.
●Superior structure stability after long-term exposure to high temperature (700〜900℃), without a drastic drop in toughness like SUS310S.
❷ Superior High Temperature Properties
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❸ Mechanical Properties
Table 5 : Mechanical Properties
Table 6 : Typical Chemical Composition (wt%)
Designation 0.2% Yield Strength(N/mm2) Tensile Strength(N/mm2) Elongation(%) Hardness(HRB)NSSMC-NAR-AH-4
UNS S31060 ≧280 ≧600 ≧40 ≦95(for reference)
SUS 310S ≧205 ≧520 ≧40 ≦90
Designation C Si Mn P S Cr Ni N La+Ce B
NSSMC-NAR-AH-4 0.07 0.31 0.48 0.021 0.001 23.11 10.95 0.197 0.03 0.003(for reference)
SUS 310S 0.05 0.58 1.21 0.023 0.001 24.63 20.25 0.024 ─ ─
Properties of NSSMC-NAR-AH-4
❶ Chemical Composition
❷ Microstructure
● Austenitic structure● Grain size:Average grain size of ASTM No.7 or coarser, as measured by Test Methods E112 ( Thickness ≧ 6mm)
Photo 1. Typical microstructure after solution heat treated
❸ High-temperature Properties
Fig.1 Tensile properties at high temperature
Fig.3 Creep rupture properties
Fig.5 Cyclic oxidation test result in the air Fig.6 Continuous oxidation test result (200h)
Fig.2 Tensile properties at room temperature
Fig.4 Charpy impact properties after aged at 700~900℃
300
200
100
800 900 10000
: AH-4: SUS 310S
Tensile Strength
0.2% Yield Strength
Test Temperature (℃)
0.2% Yield Strength/Tensile Strength
(N/mm2 )
900
800
700
600
500
400
300
200
0AH-4 SUS 310S
0.2% Y.S.T.S.
0.2% Yield Strength/Tensile Strength
(N/mm2 )
102 103 104 105
50
30
10
5
Stress
(N/mm2 )
Time to rupture (h)
Designation900℃1000℃
SUS 310SAH-4
600 800 1000Aging temperature (℃)
150
100
50
0
AH-4
SUS 310SImpact Value
(J/cm
2 )
Test piece:2mm V-notch, half sizeTest temperature:room temperatureAging time:3000h
❹ Resistance to high-temperature oxidation
-100
0
-100
0
0 100 200 300cycles
SUS 310S900℃
AH-4
400
(25minutes heating-5minutes air cooling)
Weight change by oxidation
(g/m2 )
SUS 310S1000℃
AH-4
40
30
20
10
0AH-4 SUS 310S
900℃1000℃ in air
Weight gain by oxidation
(g/m2 )
5 6
❺ Resistance to high-temperature erosion ❻ Weldability
Fig.7 Erosion test result (900℃) Fig.8 Hot cracking test result(Longi Varestraint test)
Weight loss
(mg)
Maximum depth of thickness loss
(μm)
Time (h)
600
400
50 100
200
0
4000
2000
3000
1000
0
SUS 310S
DesignationWeight loss Maximum depth ofthickness loss
AH-4
Blasted speed:5m/sTemp.:900℃Abrasives:silicate sand
AH-4 SUS 310S
Total crack length
(mm)
10
5
0
No crack
(n=2)ε=2%
↓
❼ Creep Rupture Strength of Welded Joint
❽ Welding Consumables
102 103 104 105
50
30
10
5
Stress
(N/mm2 )
Time to rupture (h)Base metal thickness:20mmWelding process:GTAWWelding consumable:WEL Auto TIG AH-4(1.2φ)
AH-4900℃ 1000℃Base MetalWelded Joint
●Supplier : Nippon Welding Rod Co., Ltd.[URL] http://www.nihonwel.co.jp/[e-mail] [email protected]
For TIG welding
WEL TIG AH-4 1.2, 1.6, 2.0, 2.4, 3.2mmφWEL Auto TIG AH-4 1.2, 1.6mmφ
For SMA welding
WEL AH-4 2.6, 3.2, 4.0, 5.0mmφ
Available Sizes
Thickness
(mm)
Width (mm)
Available maximum length:6,000mm
Consult us for custom-made dimensions.:Range of consultation
1,000
0.1
0.3
3.06.0
32.0
40.0
600
1000 1219
15242000
2,000 3,000
(Cold rolling)
(Hot rolling)
Fig.9 Creep rupture testresult of welded joint