Corus Engineering Steels
Durehete 1055
1% CrMoV Steel for bolting applications up to 570OC
Benefits Chemical Composition (wt%)
• Lower design and operating risks min max
• Simplified design for bolting configuration compared with
C 0.17 0.23
martensitic steels or high nickel alloys.
Si - 0.40
Mn 0.35 0.75
P - 0.020
Applications S - 0.020
Al 0.015 0.080
• Power generation – turbine fasteners B 0.001 0.010
– boiler support rods
Cr 0.90 1.20
• Process plant – fasteners
Mo 0.90 1.10
Ni - 0.20
V 0.60 0.80
Features Ti 0.07 0.15
As - 0.020
• Proven performance in long term service. Sn - 0.020
• Extensive database of long term, high temperature
Cu - 0.20
test results.
Sb - Report
• High room and elevated temperature strength.
• Good creep and relaxation resistance to 570OC R* - 0.1
• High notch tolerance.
* R = P + 2.43As + 3.57Sn + 8.16Sb + 0.13Cu
• Thermal expansion coefficients compatible with low alloy
steel turbine casing materials.
Related Standards and Specifications
Supply Condition & Availability Unless stated otherwise all data are in accordance with
BSEN 10269: 1999 , 20CrMoVTiB4-10 , Steel No. 1.7729
• Readily available from bar stock.
• Supplied as oil quenched, tempered and cooled in air. BSEN 1515-1: 1999
BS1506 681-820
CEGB GDCD STD2 ISS2
BS4882
Page 1 of 4 The future in metal
11/2000
Corus Engineering Steels
Durehete 1055
Mechanical Properties
Heat Treatment
Pre–Treatment Quench temperature ( OC) Coolant** Temper Temperature (OC)
O
Temperature ( C)*
All diameters Min 660 970 water/oil 680
Max 700 990 720
* Afurther subcritical treatment may subsequently be ** If d≤35 then coolant = oil
carried out at a higher temperature without cooling. If 35<d≤50 then coolant = oil or water
If d>50 then coolant = water
Test Piece Position
Test Piece Position * Position is at greater distance below surface than
Bar Diameter (mm) Position specified in BS EN 10269: 1999 to coincide with the
most highly stressed area of fasteners in service.
d≤25 centre
25<d≤100 12.5mm below surface
100<d≤200 25mm below surface*
Room Temperature Mechanical Properties
Diameter (mm) 0.2% Proof Stress UTS (N/mm2) Elongation Reduction of Impact Energy (J)*
2
(N/mm ) (%) area (%)
d 100 Min 660 820 15 50 40
Max - 1000 - - -
100<d 200 Min 660 820 15 50 27
Max - 1000 - - -
* Charpy V notch: mean of 3 test pieces.
Mechanical Properties at Elevated
Temperatures
Minimum 0.2% Proof Stress (N/mm2) at Temperature (OC)
O
Temperature( C) 50 100 150 200 250 300 350 400 450 500 550 600
d 200mm 642 624 603 595 581 573 559 537 508 464 406 334
Page 2 of 4 The future in metal
11/2000
Corus Engineering Steels
Durehete 1055
Mechanical, Oxidation & Embrittlement Properties
Mean Stress Rupture Strength
(Plain Specimens) Oxidation
Temperature (OC) Stress to Produce Rupture (N/mm2) Temperature (OC) Total depth of metal affected
10,000 h 100,000 h 200,000 h by oxidation (µm)
450 520 453 430 100 h 1,000 h 10,000 h 100,000 h
500 388 307 274 500 1.0 5 25 130*
550 261 142 114 550 2.5 12 50 220*
600 127 - - 600 18 50 140 400*
* Extrapolated values
Mean Stress Rupture Strength
(Notched Specimens)
Temperature (OC) Stress to Produce Rupture (N/mm2)
1,000 h 10,000 h 100,000 h
500 557 429 259
550 400 264 126
600 268 160 -
Mean Stress Relaxation Properties
Strain = 0.15%
O
Temperature ( C) Residual Stress (N/mm2)
1,000 h 10,000 h 30,000 h
400 247 224 212
450 216 188 173
500 180 141 118
550 134 70 42
600 61 - -
Page 3 of 4 The future in metal
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Corus Engineering Steels
Durehete 1055
Physical Properties
Temperature (OC)
20 100 200 300 400 500 600 700
3
Density (kg/m ) 7830 - - - - - - -
Electrical Resistivity (n m) 270 318 389 456 564 675 837 1010
Thermal Expansion (K -1x10-6) - 11.1 12.1 12.9 13.5 13.9 14.1 -
Thermal Conductivity (W/mK) 42 41 40 39 36 34 33 -
Specific Heat (J/kgK) 412 433 458 483 508 533 558 584
Heat Content (kJ/kg) 0 39.5 81.5 134 192 254 322 390
2
Modulus of Elasticity(kN/mm ) 211 207 198 190 183 174 165 -
Published References
1 H Everson, J. Orr, D. Dulieu: “Low Alloy Ferritic Bolting 5 H. Everson, J. Orr, L. Woollard: “Parameters Affecting
Steels for Steam Turbine Applications – The Evolution of The Long Term Creep Rupture Properties of Durehete
the Durehete Steels”, ASM/EPRI Conference “Advances 1055”, Institute of Materials Conference “Microstructural
in Material Technology for Fossil Power Plant”, Stability of Creep Resitant Alloys for High Temperature
September 1987, Chicago, pp 375-383. Plant Applications”, March 1997, Sheffield, pp271-289.
2 H. Everson, J. Orr, D. Burton, D. Dulieu: “Improvements 6 R. M. George, H. Everson, P. C. Morgan: “Improved
in Rupture Ductility of Durehete 1055”, Institute of Blading and Bolting Steels for Turbine Applications”,
Materials Conference “Rupture Ductility of Creep Steel World 3, (2), 1998, pp 68-72.
Resistant Steels”, December 1990, York.
3 H. Everson, J. Beardwood, J. Orr, D. Burton:
“The Continuing Development of Durehete 1055 and
other High Integrity Bolting Steels”, Institute of Materials
Conference “Performance of Bolting Materials in High
Temperature Plant Applications”, June 1994, York,
pp 138-149.
4 H. Everson, J. Orr: “Low Residuals in Bolting Steels”,
Institute of Materials/EPRI Conference “Clean Steel
– Super Clean Steel”, March 1995, London.
Page 4 of 4 The future in metal
11/2000
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Corus Engineering Steels
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