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Esshete 1250

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Description

Esshete 1250 is a fully austenitic chromium-nickel steel with excellent high- temperature strength and good resistance to corrosion in boiler applications. The grade can be used at temperatures up to about 650°C (1200°F), it is easily fabricated and also characterized by:

High strength in relation to other typical candidate austenitic alloys

Very good resistance to steam and flue gas atmospheres

Good structural stability at high temperatures

Good weldability

Datasheet URL:

Esshete 1250

Datasheet updated 2019-09-02 09:21 (supersedes all previous editions)

Related Standards

Equivalent Materials

This material data has been provided by Sandvik Materials Technology.

"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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Available suppliers

ALLEIMA (FORMERLY SANDVIK MATERIALS TECHNOLOGY)

MANUFACTURER

Additional services:

To ensure our customers' processes and/or products attain – and even exceed – their performance expectations, we offer a wide range of services within both the technical area and delivery logistics. Our technical services include: • Material consultations through our worldwide sales network • Advice in process optimization based on an in-depth applications knowledge • Joint new product development supported by our extensive R&D program View product groups and services

Applications

Energy

Burners & Boilers

Boilers & Heat Exchangers

Metallurgy

Iron & Steel Products

Steel Pipes & Tubes

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Properties

General

Property	Temperature	Value	Comment
Density	23.0 °C	7.9 g/cm³ Show Supplier Material materials with Density of 7.9 g/cm³
Recycled Content		82.1 % Show Supplier Material materials with Recycled Content of 82.1 %	Average recycled content

Mechanical

Property	Temperature	Value	Comment
Creep strength 10^4 cycles	600.0 °C	241 MPa Show Supplier Material materials with Creep strength 10^4 cycles of 241 MPa	at 10000h
	610.0 °C	231 MPa Show Supplier Material materials with Creep strength 10^4 cycles of 231 MPa	at 10000h
	620.0 °C	221 MPa Show Supplier Material materials with Creep strength 10^4 cycles of 221 MPa	at 10000h
	630.0 °C	210 MPa Show Supplier Material materials with Creep strength 10^4 cycles of 210 MPa	at 10000h
	640.0 °C	198 MPa Show Supplier Material materials with Creep strength 10^4 cycles of 198 MPa	at 10000h
	650.0 °C	184 MPa Show Supplier Material materials with Creep strength 10^4 cycles of 184 MPa	at 10000h
	660.0 °C	167 MPa Show Supplier Material materials with Creep strength 10^4 cycles of 167 MPa	at 10000h
	670.0 °C	147 MPa Show Supplier Material materials with Creep strength 10^4 cycles of 147 MPa	at 10000h
	680.0 °C	124 MPa Show Supplier Material materials with Creep strength 10^4 cycles of 124 MPa	at 10000h
	690.0 °C	102 MPa Show Supplier Material materials with Creep strength 10^4 cycles of 102 MPa	at 10000h
	700.0 °C	86 MPa Show Supplier Material materials with Creep strength 10^4 cycles of 86 MPa	at 10000h
	710.0 °C	75 MPa Show Supplier Material materials with Creep strength 10^4 cycles of 75 MPa	at 10000h
	720.0 °C	67 MPa Show Supplier Material materials with Creep strength 10^4 cycles of 67 MPa	at 10000h
	730.0 °C	61 MPa Show Supplier Material materials with Creep strength 10^4 cycles of 61 MPa	at 10000h
	740.0 °C	55 MPa Show Supplier Material materials with Creep strength 10^4 cycles of 55 MPa	at 10000h
	750.0 °C	51 MPa Show Supplier Material materials with Creep strength 10^4 cycles of 51 MPa	at 10000h
	760.0 °C	46 MPa Show Supplier Material materials with Creep strength 10^4 cycles of 46 MPa	at 10000h
	770.0 °C	42 MPa Show Supplier Material materials with Creep strength 10^4 cycles of 42 MPa	at 10000h
	780.0 °C	38 MPa Show Supplier Material materials with Creep strength 10^4 cycles of 38 MPa	at 10000h
	790.0 °C	34 MPa Show Supplier Material materials with Creep strength 10^4 cycles of 34 MPa	at 10000h

Creep strength 10^5 cycles	600.0 °C	199 MPa Show Supplier Material materials with Creep strength 10^5 cycles of 199 MPa	at 100000h
	610.0 °C	185 MPa Show Supplier Material materials with Creep strength 10^5 cycles of 185 MPa	at 100000h
	620.0 °C	167 MPa Show Supplier Material materials with Creep strength 10^5 cycles of 167 MPa	at 100000h
	630.0 °C	147 MPa Show Supplier Material materials with Creep strength 10^5 cycles of 147 MPa	at 100000h
	640.0 °C	122 MPa Show Supplier Material materials with Creep strength 10^5 cycles of 122 MPa	at 100000h
	650.0 °C	100 MPa Show Supplier Material materials with Creep strength 10^5 cycles of 100 MPa	at 100000h
	660.0 °C	84 MPa Show Supplier Material materials with Creep strength 10^5 cycles of 84 MPa	at 100000h
	670.0 °C	74 MPa Show Supplier Material materials with Creep strength 10^5 cycles of 74 MPa	at 100000h
	680.0 °C	66 MPa Show Supplier Material materials with Creep strength 10^5 cycles of 66 MPa	at 100000h
	690.0 °C	59 MPa Show Supplier Material materials with Creep strength 10^5 cycles of 59 MPa	at 100000h
	700.0 °C	54 MPa Show Supplier Material materials with Creep strength 10^5 cycles of 54 MPa	at 100000h
	710.0 °C	49 MPa Show Supplier Material materials with Creep strength 10^5 cycles of 49 MPa	at 100000h
	720.0 °C	45 MPa Show Supplier Material materials with Creep strength 10^5 cycles of 45 MPa	at 100000h
	730.0 °C	40 MPa Show Supplier Material materials with Creep strength 10^5 cycles of 40 MPa	at 100000h
	740.0 °C	36 MPa Show Supplier Material materials with Creep strength 10^5 cycles of 36 MPa	at 100000h
	750.0 °C	30 MPa Show Supplier Material materials with Creep strength 10^5 cycles of 30 MPa	at 100000h
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Creep strength 25x10^4 cycles	600.0 °C	177 MPa Show Supplier Material materials with Creep strength 25x10^4 cycles of 177 MPa	at 250000h
	610.0 °C	158 MPa Show Supplier Material materials with Creep strength 25x10^4 cycles of 158 MPa	at 250000h
	620.0 °C	134 MPa Show Supplier Material materials with Creep strength 25x10^4 cycles of 134 MPa	at 250000h
	630.0 °C	109 MPa Show Supplier Material materials with Creep strength 25x10^4 cycles of 109 MPa	at 250000h
	640.0 °C	90 MPa Show Supplier Material materials with Creep strength 25x10^4 cycles of 90 MPa	at 250000h
	650.0 °C	78 MPa Show Supplier Material materials with Creep strength 25x10^4 cycles of 78 MPa	at 250000h
	660.0 °C	69 MPa Show Supplier Material materials with Creep strength 25x10^4 cycles of 69 MPa	at 250000h
	670.0 °C	52 MPa Show Supplier Material materials with Creep strength 25x10^4 cycles of 52 MPa	at 250000h
	680.0 °C	56 MPa Show Supplier Material materials with Creep strength 25x10^4 cycles of 56 MPa	at 250000h
	700.0 °C	46 MPa Show Supplier Material materials with Creep strength 25x10^4 cycles of 46 MPa	at 250000h
	710.0 °C	42 MPa Show Supplier Material materials with Creep strength 25x10^4 cycles of 42 MPa	at 250000h
	720.0 °C	37 MPa Show Supplier Material materials with Creep strength 25x10^4 cycles of 37 MPa	at 250000h
	730.0 °C	32 MPa Show Supplier Material materials with Creep strength 25x10^4 cycles of 32 MPa	at 250000h
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Elastic modulus	20.0 °C	192 GPa Show Supplier Material materials with Elastic modulus of 192 GPa
	100.0 °C	184 GPa Show Supplier Material materials with Elastic modulus of 184 GPa
	200.0 °C	176 GPa Show Supplier Material materials with Elastic modulus of 176 GPa
	300.0 °C	168 GPa Show Supplier Material materials with Elastic modulus of 168 GPa
	400.0 °C	160 GPa Show Supplier Material materials with Elastic modulus of 160 GPa
	500.0 °C	151 GPa Show Supplier Material materials with Elastic modulus of 151 GPa
	600.0 °C	143 GPa Show Supplier Material materials with Elastic modulus of 143 GPa
	700.0 °C	135 GPa Show Supplier Material materials with Elastic modulus of 135 GPa
	800.0 °C	127 GPa Show Supplier Material materials with Elastic modulus of 127 GPa
	900.0 °C	120 GPa Show Supplier Material materials with Elastic modulus of 120 GPa
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Elongation	23.0 °C	35 % Show Supplier Material materials with Elongation of 35 %	min.
Elongation A2	23.0 °C	35 % Show Supplier Material materials with Elongation A2 of 35 %	min.
Hardness, Rockwell B	23.0 °C	90 [-] Show Supplier Material materials with Hardness, Rockwell B of 90 [-]	max.
Tensile strength	23.0 °C	540 - 740 MPa Show Supplier Material materials with Tensile strength of 540 - 740 MPa
Yield strength Rp0.1	20.0 °C	270 MPa Show Supplier Material materials with Yield strength Rp0.1 of 270 MPa	min.
	50.0 °C	254 MPa Show Supplier Material materials with Yield strength Rp0.1 of 254 MPa	min.
	100.0 °C	232 MPa Show Supplier Material materials with Yield strength Rp0.1 of 232 MPa	min.
	150.0 °C	210 MPa Show Supplier Material materials with Yield strength Rp0.1 of 210 MPa	min.
	200.0 °C	195 MPa Show Supplier Material materials with Yield strength Rp0.1 of 195 MPa	min.
	250.0 °C	190 MPa Show Supplier Material materials with Yield strength Rp0.1 of 190 MPa	min.
	300.0 °C	187 MPa Show Supplier Material materials with Yield strength Rp0.1 of 187 MPa	min.
	350.0 °C	184 MPa Show Supplier Material materials with Yield strength Rp0.1 of 184 MPa	min.
	400.0 °C	182 MPa Show Supplier Material materials with Yield strength Rp0.1 of 182 MPa	min.
	450.0 °C	179 MPa Show Supplier Material materials with Yield strength Rp0.1 of 179 MPa	min.
	500.0 °C	178 MPa Show Supplier Material materials with Yield strength Rp0.1 of 178 MPa	min.
	550.0 °C	175 MPa Show Supplier Material materials with Yield strength Rp0.1 of 175 MPa	min.
	600.0 °C	170 MPa Show Supplier Material materials with Yield strength Rp0.1 of 170 MPa	min.
	650.0 °C	165 MPa Show Supplier Material materials with Yield strength Rp0.1 of 165 MPa	min.
	700.0 °C	159 MPa Show Supplier Material materials with Yield strength Rp0.1 of 159 MPa	min.
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Yield strength Rp0.2	20.0 °C	230 MPa Show Supplier Material materials with Yield strength Rp0.2 of 230 MPa	min.
	50.0 °C	213 MPa Show Supplier Material materials with Yield strength Rp0.2 of 213 MPa	min.
	100.0 °C	188 MPa Show Supplier Material materials with Yield strength Rp0.2 of 188 MPa	min.
	150.0 °C	171 MPa Show Supplier Material materials with Yield strength Rp0.2 of 171 MPa	min.
	200.0 °C	161 MPa Show Supplier Material materials with Yield strength Rp0.2 of 161 MPa	min.
	250.0 °C	153 MPa Show Supplier Material materials with Yield strength Rp0.2 of 153 MPa	min.
	300.0 °C	148 MPa Show Supplier Material materials with Yield strength Rp0.2 of 148 MPa	min.
	350.0 °C	145 MPa Show Supplier Material materials with Yield strength Rp0.2 of 145 MPa	min.
	400.0 °C	144 MPa Show Supplier Material materials with Yield strength Rp0.2 of 144 MPa	min.
	450.0 °C	141 MPa Show Supplier Material materials with Yield strength Rp0.2 of 141 MPa	min.
	500.0 °C	139 MPa Show Supplier Material materials with Yield strength Rp0.2 of 139 MPa	min.
	550.0 °C	136 MPa Show Supplier Material materials with Yield strength Rp0.2 of 136 MPa	min.
	600.0 °C	133 MPa Show Supplier Material materials with Yield strength Rp0.2 of 133 MPa	min.
	650.0 °C	130 MPa Show Supplier Material materials with Yield strength Rp0.2 of 130 MPa	min.
	700.0 °C	125 MPa Show Supplier Material materials with Yield strength Rp0.2 of 125 MPa	min.
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Thermal

Property	Temperature	Value	Comment
Coefficient of thermal expansion	100.0 °C	1.5E-5 1/K Show Supplier Material materials with Coefficient of thermal expansion of 1.5E-5 1/K	for 30°C to the mentioned temperature
	200.0 °C	1.6E-5 1/K Show Supplier Material materials with Coefficient of thermal expansion of 1.6E-5 1/K	for 30°C to the mentioned temperature
	300.0 °C	1.7E-5 1/K Show Supplier Material materials with Coefficient of thermal expansion of 1.7E-5 1/K	for 30°C to the mentioned temperature
	400.0 °C	1.8E-5 1/K Show Supplier Material materials with Coefficient of thermal expansion of 1.8E-5 1/K	for 30°C to the mentioned temperature
	500.0 °C	1.85E-5 1/K Show Supplier Material materials with Coefficient of thermal expansion of 1.85E-5 1/K	for 30°C to the mentioned temperature
	600.0 °C	1.9E-5 1/K Show Supplier Material materials with Coefficient of thermal expansion of 1.9E-5 1/K	for 30°C to the mentioned temperature
	700.0 °C	1.9E-5 1/K Show Supplier Material materials with Coefficient of thermal expansion of 1.9E-5 1/K	for 30°C to the mentioned temperature
	800.0 °C	1.95E-5 1/K Show Supplier Material materials with Coefficient of thermal expansion of 1.95E-5 1/K	for 30°C to the mentioned temperature
	900.0 °C	2E-5 1/K Show Supplier Material materials with Coefficient of thermal expansion of 2E-5 1/K	for 30°C to the mentioned temperature
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Specific heat capacity	100.0 °C	505 J/(kg·K) Show Supplier Material materials with Specific heat capacity of 505 J/(kg·K)	for 20°C to the mentioned temperature
	200.0 °C	530 J/(kg·K) Show Supplier Material materials with Specific heat capacity of 530 J/(kg·K)	for 20°C to the mentioned temperature
	300.0 °C	540 J/(kg·K) Show Supplier Material materials with Specific heat capacity of 540 J/(kg·K)	for 20°C to the mentioned temperature
	400.0 °C	545 J/(kg·K) Show Supplier Material materials with Specific heat capacity of 545 J/(kg·K)	for 20°C to the mentioned temperature
	500.0 °C	555 J/(kg·K) Show Supplier Material materials with Specific heat capacity of 555 J/(kg·K)	for 20°C to the mentioned temperature
	600.0 °C	560 J/(kg·K) Show Supplier Material materials with Specific heat capacity of 560 J/(kg·K)	for 20°C to the mentioned temperature
	700.0 °C	565 J/(kg·K) Show Supplier Material materials with Specific heat capacity of 565 J/(kg·K)	for 20°C to the mentioned temperature
	800.0 °C	575 J/(kg·K) Show Supplier Material materials with Specific heat capacity of 575 J/(kg·K)	for 20°C to the mentioned temperature
	900.0 °C	580 J/(kg·K) Show Supplier Material materials with Specific heat capacity of 580 J/(kg·K)	for 20°C to the mentioned temperature
	1000.0 °C	585 J/(kg·K) Show Supplier Material materials with Specific heat capacity of 585 J/(kg·K)	for 20°C to the mentioned temperature
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Thermal conductivity	20.0 °C	13 W/(m·K) Show Supplier Material materials with Thermal conductivity of 13 W/(m·K)
	100.0 °C	14 W/(m·K) Show Supplier Material materials with Thermal conductivity of 14 W/(m·K)
	200.0 °C	15 W/(m·K) Show Supplier Material materials with Thermal conductivity of 15 W/(m·K)
	300.0 °C	17 W/(m·K) Show Supplier Material materials with Thermal conductivity of 17 W/(m·K)
	400.0 °C	19 W/(m·K) Show Supplier Material materials with Thermal conductivity of 19 W/(m·K)
	500.0 °C	20 W/(m·K) Show Supplier Material materials with Thermal conductivity of 20 W/(m·K)
	600.0 °C	22 W/(m·K) Show Supplier Material materials with Thermal conductivity of 22 W/(m·K)
	700.0 °C	23 W/(m·K) Show Supplier Material materials with Thermal conductivity of 23 W/(m·K)
	800.0 °C	24 W/(m·K) Show Supplier Material materials with Thermal conductivity of 24 W/(m·K)
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Electrical

Property	Temperature	Value
Electrical resistivity	20.0 °C	7.4E-7 Ω·m Show Supplier Material materials with Electrical resistivity of 7.4E-7 Ω·m
	100.0 °C	8E-7 Ω·m Show Supplier Material materials with Electrical resistivity of 8E-7 Ω·m
	200.0 °C	8.8E-7 Ω·m Show Supplier Material materials with Electrical resistivity of 8.8E-7 Ω·m
	300.0 °C	9.4E-7 Ω·m Show Supplier Material materials with Electrical resistivity of 9.4E-7 Ω·m
	400.0 °C	1E-6 Ω·m Show Supplier Material materials with Electrical resistivity of 1E-6 Ω·m
	500.0 °C	1.05E-6 Ω·m Show Supplier Material materials with Electrical resistivity of 1.05E-6 Ω·m
	600.0 °C	1.09E-6 Ω·m Show Supplier Material materials with Electrical resistivity of 1.09E-6 Ω·m
	700.0 °C	1.13E-6 Ω·m Show Supplier Material materials with Electrical resistivity of 1.13E-6 Ω·m
	800.0 °C	1.16E-6 Ω·m Show Supplier Material materials with Electrical resistivity of 1.16E-6 Ω·m
	900.0 °C	1.18E-6 Ω·m Show Supplier Material materials with Electrical resistivity of 1.18E-6 Ω·m
	1000.0 °C	1.2E-6 Ω·m Show Supplier Material materials with Electrical resistivity of 1.2E-6 Ω·m
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Chemical properties

Property	Value	Comment
Boron	5E-3 % Show Supplier Material materials with Boron of 5E-3 %
Carbon	0.1 % Show Supplier Material materials with Carbon of 0.1 %
Chromium	15 % Show Supplier Material materials with Chromium of 15 %
Iron	Balance
Manganese	6.3 % Show Supplier Material materials with Manganese of 6.3 %
Molybdenum	1 % Show Supplier Material materials with Molybdenum of 1 %
Nickel	9.5 % Show Supplier Material materials with Nickel of 9.5 %
Niobium	1 % Show Supplier Material materials with Niobium of 1 %
Phosphorus	0.04 % Show Supplier Material materials with Phosphorus of 0.04 %	max.
Silicon	0.5 % Show Supplier Material materials with Silicon of 0.5 %
Sulfur	0.015 % Show Supplier Material materials with Sulfur of 0.015 %	max.
Vanadium	0.3 % Show Supplier Material materials with Vanadium of 0.3 %

Technological properties

Property
Application areas	The high creep strength of Esshete 1250, combined with its good resistance to steam and flue gas atmospheres, makes it a very suitable material for use in coal-fired boilers. The grade was developed in the United Kingdom in the 1960's, and the bulk of the material has been used in the UK power industry in 500 and 660 MW boilers. The main application has been superheaters and reheaters operating at 570°C (1058°F), steam pressure 170 bar (superheaters) and 40 bar (reheaters). Typical metal temperature 600–700°C (1112–1292°F), in flue gas temperature 900–1200°C (1652–2192°F). The corrosion environment on the fireside in the UK boilers was historically very aggressive as the British coal has, typically a high chlorine content of up to 0.6%, sulphur at 1–2% and a high ash content of 20%. Esshete 1250 has also been used successfully in superheaters in biomass boilers, burning various biofuels and producing steam at 580–540°C (1076–1004°F) at 60–200 bars pressure. Trademark information: Esshete 1250 is a trademark owned by Corus
Certifications	Approvals: VdTÜV-Werkstoffblatt 520 and PED (Pressure Equipment Directive) 2014/68/EU
Cold Forming	Esshete 1250 can be cold bent to narrow bending radii. Heat treatment after cold bending is not normally necessary, but this must be decided after considering the degree of bending and the operating conditions. If post bending heat treatment is carried out, it should be in the form of solution annealing.
Corrosion properties	Air: Good resistance to scaling up to 800°C (1472°F). Gaseous corrosion: Good resistance to steam and flue gas atmospheres. In service conditions typical of coal-fired boilers, the alloy has a very similar fireside corrosion to alloys of the ASTM 316H type. However, the much increased high-temperature strength gives significantly improved service performance. Fireside corrosion resistance in coal-fired, biomass-fired or coal/biomass co-fired boilers is similar to that of type ASTM 347H. Steam-side corrosion is similar to that of type ASTM 347H.
Heat Treatment	Tubes are delivered in the heat treated condition. If another heat treatment is needed after further processing the following is recommended: Stress relieving: 850–950°C (1560–1740°F), 10–15 minutes, cooling in air. Solution annealing: 1050–1150°C (1920–2100°F), 5–20 minutes, rapid cooling in air, gas or water.
Hot forming	Hot bending is carried out at 1100–850°C (1832–1652°F) and should be followed by solution annealing.
Other	Forms of supply: Seamless tube and pipe in Esshete 1250 is supplied in dimensions up to 260 mm (10.24 in.) outside diameter, in the solution annealed and white-pickled condition or in the bright annealed condition.
Structural Stability	As in other austenitic stainless steels, sigma phase can be formed after long heat treatment in the range 550–950°C (1022–1742oF). Due to the low chromium content, Esshete 1250 is significantly less sensitive to sigma phase formation than steels of e.g. the ASTM 316 type, according to tests involving ageing for 100000 h.
Welding	The weldability of Esshete 1250 is good. Welding must be carried out without preheating and subsequent heat treatment is normally not required. Suitable methods of fusion welding are manual metal-arc welding (MMA/SMAW) and gas-shielded arc welding, with the TIG/GTAW method as first choice. For Esshete 1250, heat input of <1.5 kJ/mm and interpass temperature of <150°C (300°F) are recommended. Recommended filler metals: TIG/GTAW or MIG/GMAW welding ISO 18274 S Ni 6082 / AWS A5.14 ERNiCr-3 (e.g. Exaton Ni72HP) MMA/SMAW welding ISO 14172 E Ni 6182/ AWS A5.11 ENiCrFe-3 (e.g. Exaton Ni71)