SEW 555 Grade 23CrNiMo7-4-7 quenched and tempered (+QT)

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Description

The high temperature alloy steel 23CrNiMo7-4-7 is used for larger preshaped components in the quenched and tempered condition in turbine and generator installations, in particular as shafts and discs. The steel is weldable if the relevant measures required are observed.

Related Standards

SEW 555

Equivalent Materials

This material data has been provided by WIAM.

"Typical" values were obtained via a literature search. "Predicted" values were imputed via artificial intelligence technology. While we have placed significant efforts in ensuring data accuracy, "typical" and "predicted" data should be considered indicative and verified by appropriate material testing. Please do contact us if additional information on the the predicted data method is required.
All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

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Properties

General

Property	Temperature	Value
Density	20.0 °C	7.85 g/cm³ Show Material materials with Density of 7.85 g/cm³

Mechanical

Property	Temperature	Value	Comment
Elastic modulus	-100.0 °C	217 GPa Show Material materials with Elastic modulus of 217 GPa
	20.0 °C	212 GPa Show Material materials with Elastic modulus of 212 GPa
	100.0 °C	207 GPa Show Material materials with Elastic modulus of 207 GPa
	200.0 °C	199 - 200 GPa Show Material materials with Elastic modulus of 199 - 200 GPa
	300.0 °C	192 - 193 GPa Show Material materials with Elastic modulus of 192 - 193 GPa
	400.0 °C	184 GPa Show Material materials with Elastic modulus of 184 GPa
	500.0 °C	175 GPa Show Material materials with Elastic modulus of 175 GPa
	600.0 °C	164 GPa Show Material materials with Elastic modulus of 164 GPa

Elongation, transverse	20.0 °C	12 % Show Material materials with Elongation, transverse of 12 %
Poisson's ratio	23.0 °C	0.29 [-] Show Material materials with Poisson's ratio of 0.29 [-]	Typical for Nickel Chromium Molybdenum Steel
Reduction of area, transverse	20.0 °C	40 % Show Material materials with Reduction of area, transverse of 40 %
Tensile strength, transverse	20.0 °C	750 - 900 MPa Show Material materials with Tensile strength, transverse of 750 - 900 MPa
Yield strength Rp0.2	100.0 °C	565 MPa Show Material materials with Yield strength Rp0.2 of 565 MPa
	200.0 °C	535 MPa Show Material materials with Yield strength Rp0.2 of 535 MPa
	250.0 °C	515 MPa Show Material materials with Yield strength Rp0.2 of 515 MPa
	300.0 °C	490 MPa Show Material materials with Yield strength Rp0.2 of 490 MPa
	350.0 °C	435 MPa Show Material materials with Yield strength Rp0.2 of 435 MPa
	400.0 °C	405 MPa Show Material materials with Yield strength Rp0.2 of 405 MPa
	450.0 °C	375 MPa Show Material materials with Yield strength Rp0.2 of 375 MPa
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Yield strength Rp0.2, transverse	20.0 °C	600 MPa Show Material materials with Yield strength Rp0.2, transverse of 600 MPa

Thermal

Property	Temperature	Value	Comment
Coefficient of thermal expansion	-100.0 °C	1.05E-5 1/K Show Material materials with Coefficient of thermal expansion of 1.05E-5 1/K
	20.0 °C	1.15E-5 1/K Show Material materials with Coefficient of thermal expansion of 1.15E-5 1/K
	100.0 °C	1.11E-5 - 1.21E-5 1/K Show Material materials with Coefficient of thermal expansion of 1.11E-5 - 1.21E-5 1/K
	200.0 °C	1.21E-5 - 1.27E-5 1/K Show Material materials with Coefficient of thermal expansion of 1.21E-5 - 1.27E-5 1/K
	300.0 °C	1.29E-5 - 1.32E-5 1/K Show Material materials with Coefficient of thermal expansion of 1.29E-5 - 1.32E-5 1/K
	400.0 °C	1.35E-5 - 1.36E-5 1/K Show Material materials with Coefficient of thermal expansion of 1.35E-5 - 1.36E-5 1/K
	500.0 °C	1.39E-5 - 1.4E-5 1/K Show Material materials with Coefficient of thermal expansion of 1.39E-5 - 1.4E-5 1/K
	600.0 °C	1.41E-5 - 1.44E-5 1/K Show Material materials with Coefficient of thermal expansion of 1.41E-5 - 1.44E-5 1/K
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Max service temperature, long		370 - 480 °C Show Material materials with Max service temperature, long of 370 - 480 °C
Melting point		1382 - 1529 °C Show Material materials with Melting point of 1382 - 1529 °C	Typical for Nickel Chromium Molybdenum Steel
Specific heat capacity	-100.0 °C	423 J/(kg·K) Show Material materials with Specific heat capacity of 423 J/(kg·K)
	20.0 °C	461 J/(kg·K) Show Material materials with Specific heat capacity of 461 J/(kg·K)
	100.0 °C	479 J/(kg·K) Show Material materials with Specific heat capacity of 479 J/(kg·K)
	200.0 °C	499 J/(kg·K) Show Material materials with Specific heat capacity of 499 J/(kg·K)
	300.0 °C	517 J/(kg·K) Show Material materials with Specific heat capacity of 517 J/(kg·K)
	400.0 °C	536 J/(kg·K) Show Material materials with Specific heat capacity of 536 J/(kg·K)
	500.0 °C	558 J/(kg·K) Show Material materials with Specific heat capacity of 558 J/(kg·K)
	600.0 °C	587 J/(kg·K) Show Material materials with Specific heat capacity of 587 J/(kg·K)
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Thermal conductivity	20.0 °C	47.1 W/(m·K) Show Material materials with Thermal conductivity of 47.1 W/(m·K)
	100.0 °C	43 - 47.1 W/(m·K) Show Material materials with Thermal conductivity of 43 - 47.1 W/(m·K)
	200.0 °C	42 - 45.9 W/(m·K) Show Material materials with Thermal conductivity of 42 - 45.9 W/(m·K)
	300.0 °C	40 - 43.8 W/(m·K) Show Material materials with Thermal conductivity of 40 - 43.8 W/(m·K)
	400.0 °C	37 - 41.3 W/(m·K) Show Material materials with Thermal conductivity of 37 - 41.3 W/(m·K)
	500.0 °C	34 - 38.7 W/(m·K) Show Material materials with Thermal conductivity of 34 - 38.7 W/(m·K)
	600.0 °C	36 W/(m·K) Show Material materials with Thermal conductivity of 36 W/(m·K)
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Thermal diffusivity	20.0 °C	13 mm²/s Show Material materials with Thermal diffusivity of 13 mm²/s
	100.0 °C	12.1 mm²/s Show Material materials with Thermal diffusivity of 12.1 mm²/s
	200.0 °C	11.1 mm²/s Show Material materials with Thermal diffusivity of 11.1 mm²/s
	300.0 °C	9.9 mm²/s Show Material materials with Thermal diffusivity of 9.9 mm²/s
	400.0 °C	8.7 mm²/s Show Material materials with Thermal diffusivity of 8.7 mm²/s
	500.0 °C	7.4 mm²/s Show Material materials with Thermal diffusivity of 7.4 mm²/s
	600.0 °C	6 mm²/s Show Material materials with Thermal diffusivity of 6 mm²/s
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Electrical

Property	Temperature	Value
Electrical resistivity	20.0 °C	2.21E-7 Ω·m Show Material materials with Electrical resistivity of 2.21E-7 Ω·m
	100.0 °C	2.72E-7 Ω·m Show Material materials with Electrical resistivity of 2.72E-7 Ω·m
	200.0 °C	3.44E-7 Ω·m Show Material materials with Electrical resistivity of 3.44E-7 Ω·m
	300.0 °C	4.28E-7 Ω·m Show Material materials with Electrical resistivity of 4.28E-7 Ω·m
	400.0 °C	5.26E-7 Ω·m Show Material materials with Electrical resistivity of 5.26E-7 Ω·m
	500.0 °C	6.39E-7 Ω·m Show Material materials with Electrical resistivity of 6.39E-7 Ω·m
	600.0 °C	7.7E-7 Ω·m Show Material materials with Electrical resistivity of 7.7E-7 Ω·m
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Chemical properties

Property	Value
Carbon	0.2 - 0.26 % Show Material materials with Carbon of 0.2 - 0.26 %
Chromium	1.7 - 2 % Show Material materials with Chromium of 1.7 - 2 %
Manganese	0.5 - 0.8 % Show Material materials with Manganese of 0.5 - 0.8 %
Molybdenum	0.6 - 0.8 % Show Material materials with Molybdenum of 0.6 - 0.8 %
Nickel	0.9 - 1.2 % Show Material materials with Nickel of 0.9 - 1.2 %
Phosphorus	0.01 - 0.02 % Show Material materials with Phosphorus of 0.01 - 0.02 %
Silicon	0.3 % Show Material materials with Silicon of 0.3 %
Sulfur	0.007 - 0.018 % Show Material materials with Sulfur of 0.007 - 0.018 %