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STAINLESS STEEL IN THE SUN
Hans L. Groth, Bo Ivarsson, Erik Schedin, Emma Jakobsen and
Rita Lindström
December 7, 2012, Ascot, UK
www.outokumpu.com
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Contents
1. RT and HT tensile testing
2. Influence of tensile testing speed
3. Modified values / curves
4. Conclusions
14 December 2012 2
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RT tensile testing, Standards
14 December 2012 3
RT Tensile testing Proof strength After proof strength
(2%)
Allowable test speed
according to
Strain rate
[(mm/mm)/s]
Stress rate
[MPa/s]
Strain rate
[(mm/mm)/s]
(Old EN 10002-1)
EN ISO 6892-1 (Meth A)
ASTM A370
0.00025 – 0.0025
0.00020 – 0.00030 (R2)
< 0.00104
6 – 60
N/A
1.15 – 11.5
< 0.008
0.0054 – 0.0080 (R4)
0.00083 – 0.0083
(Old EN) combined with ASTM
0.00025 – 0.001
6 – 11.5
0.0008 – 0.0080
EN-ISO combined with ASTM
0.00025 – 0.00030
N/A
0.0054 - 0.0080
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HT tensile testing, Standards
14 December 2012 4
HT Tensile testing Proof strength After proof strength
(2%)
Allowable test speed
according to
Strain rate
[(mm/mm)/s]
Stress rate
[MPa/s]
Strain rate
[(mm/mm)/s]
(Old EN 10002-5)
EN ISO 6892-2 Meth. A
ASTM E21
0.0000167 – 0.000083
0.000056 – 0.000084 (R1)
0.000050 - 0.000117
N/A
N/A
N/A
0.0003 – 0.0033
0.00112 – 0.00168 (R3)
0.00067 - 0.0010
(Old EN) combined with ASTM
0.00005 - 0.000083
N/A
0.0003 – 0.001
EN-ISO combined with ASTM
0.000056 - 0.000084
N/A
No overlap
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RT – HT – Remarks, Mill perspective
14 December 2012 5
HT at RT
- Too time consuming for release testing
HT - Lower proof strength due to
lower strain rate
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RT – HT – Same test parameters
14 December 2012 6
HT Tensile testing Proof strength After proof strength
(2%)
Allowable test speed
according to
Strain rate
[(mm/mm)/s]
Stress rate
[MPa/s]
Strain rate
[(mm/mm)/s]
EN ISO 6892-1 Meth. A RT
EN ISO 6892-2 Meth. A HT
0.00020 – 0.00030 (R2)
0.00020 – 0.00030 (R2)
N/A
N/A
0.0054 – 0.0080 (R4)
0.0054 – 0.0080 (R4)
It´s possible to make the same ”standardised”
test for both RT and HT!
Other combinations also available.
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New tests made at RT and HT
14 December 2012 7
RT: Tested at strain rate 0.001/s up to 2%
and then changed to 0.008/s
HT: Tested at strain rate 0.000083/s up to 2%
and then changed to 0.001/s
.
Test parameters used at Outokumpu ARC.
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Influence of testing speed 1.4301 at RT
14 December 2012 8
0
100
200
300
400
500
600
700
Rp0.2 Rp1.0 Rm Rt2
[MP
a]
F1
F2
F3
S1
S2
Rp0.2 Rp1.0 Rm Rt2
RT (F) 326 364 637 384
HT (S) 299 340 646 360
Diff -27 -24 +9 -24
All in [MPa]
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Influence of testing speed LDX 2101®
at RT
14 December 2012 9
0
100
200
300
400
500
600
700
800
900
Rp0.2 Rp1.0 Rm Rt2
[MP
a]
F1
F2
F3
S1
S3
S4
Rp0.2 Rp1.0 Rm Rt2
RT (F) 588 632 773 648
HT (S) 564 606 770 625
Diff -24 -26 -3 -23
All in [MPa]
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Influence of testing speed
14 December 2012 10
Difference in Rp0.2 roughly 25 MPa less for HT
compared to RT in the tests.
According to experience: in the range 20 – 40 MPa
and Rm not influenced.
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RT – HT ”In the Sun”, EN + tests
14 December 2012 11
Rp0.2
[MPa]
Temp
[°C]
No HT-data for
1.4162 or
other Duplex
in
EN 10088-4 !
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RT – HT ”In the Sun”, Retention, EN
14 December 2012 12
Temp
[°C]
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”In the Sun”, Retention, CR EN - Testing
14 December 2012 13
Temp
[°C]
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Retention, CR EN – Testing - Proposals
14 December 2012 14
Temp
[°C]
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Correction: Fire Design Curve, 1.4162
14 December 2012 15
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Conclusions ”In the Sun”
1. The drop in strength from RT to +35/50°C is a
consequence of the test standards.
2. Standardized HT testing is a mess! (ISO)
3. Test “In the Sun” with own procedure using same
parameters. Let this be separated from HT-testing/data.
Keep as a separate issue!
4. Make proper design curve to new and old data based on
steel type/grade. Three possibilities at least. To be
further discussed.
5. Retention increase 0.15 at 80C and between 0.08 –
0.15 at 50C. (Prop 1 & 2) Significant improvement.
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Thank You!
www.outokumpu.com