DIN 17744 NiCr21Mo Soft-Annealed Steel (+A) – High-Performance Pressure Vessel Material

According to the VdTÜV-Werkstoffblatt editions VdTÜV-Wbl 432-1 : 1999-06 (sheet metal, strip metal), VdTÜV-Wbl 432-2 : 1999-03 (seamless tube) and VdTÜV-Wbl 432-3 : 1999-06 (bar steel, forging) as well as VdTÜV 541 : 2001-06 (seamless compound pipes, coating material), the material NiCr21Mo with the material number 2.4858 is used for pressure vessels according to TRB 100 and, with interpreting the AD-Merkblatt W 2 faithfully to its meaning, for temperatures from -10 to 450 degrees. The highly corrosion-resistant nickel alloy is used in the nuclear engineering as far as the rules of nuclear engineering or the object-related specifications permit the use of - 10 to 450 °C. With observance of the generally acknowledged rules of technology, the suitability for welding of the nickel alloy is approved for metal-arc welding and gas-shielded arc welding (short arc). A heat treatment is not necessary, a preheating - except for the removal of condensed moisture - ought to be omitted. The maximum holding temperature is 200 °C. The material is cold- and hot-formable and, in accordance with DIN 50914, it is resistant to intercrystalline corrosion in the welded condition, too. The maximum eroding rate in the Huey-test is 0,6 mm/year (mean value of the 5 testing periods) in the as-delivered condition. The following is valid for the material according to DIN 17744 : 2002-09: the nickel alloy is applied in the form of strips, sheets, tubes, bars, wires and forgings for corrosion-resistant construction components. The alloy possesses very good resistance to reducing as well as to oxidizing acids, to stress cracking corrosion as well as to pitting and crevice corrosion. It has proven outstandingly worthwile in solutions of sulphuric and phosphoric acid. Applications for the chemical manufacturing technology, for plants for the prevention of air pollution, for tubes for the extraction of oil and gas, for the recycling of nuclear fuel assemblies, for the acid production for cellulose digesters in the paper industry as well as for pickling facilities. Processing properties: Formability: good Weldability: good (Werkstoffblatt/Wbl: material specification Merkblatt: specification sheet)

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

Properties

General

Property	Temperature	Value
Density	20.0 °C	8.05 - 8.1 g/cm³

Mechanical

Property	Temperature	Value
Elastic modulus	20.0 °C	195 GPa
	100.0 °C	190 GPa
	200.0 °C	185 GPa
	300.0 °C	179 GPa
	400.0 °C	174 GPa
	500.0 °C	168 GPa
	600.0 °C	161 GPa
	700.0 °C	154 GPa
	800.0 °C	142 GPa
	900.0 °C	130 GPa
	1000.0 °C	119 GPa
Elongation	20.0 °C	30 - 35 %
Elongation A100	20.0 °C	20 - 30 %
Elongation, transverse	20.0 °C	30 %
Hardness, Brinell	20.0 °C	190 - 210 [-]
Tensile strength	20.0 °C	500 - 750 MPa
	100.0 °C	520 - 530 MPa
	200.0 °C	490 - 515 MPa
	300.0 °C	480 - 500 MPa
	400.0 °C	470 - 490 MPa
	450.0 °C	465 - 485 MPa
Tensile strength, transverse	20.0 °C	550 - 750 MPa
Yield strength Rp0.2	20.0 °C	220 - 240 MPa
	100.0 °C	190 - 205 MPa
	150.0 °C	175 - 190 MPa
	200.0 °C	165 - 180 MPa
	250.0 °C	160 - 175 MPa
	300.0 °C	155 - 170 MPa
	350.0 °C	150 - 165 MPa
	400.0 °C	145 - 160 MPa
	450.0 °C	140 - 155 MPa
Yield strength Rp0.2, transverse	20.0 °C	220 - 235 MPa
Yield strength Rp1.0	20.0 °C	250 - 270 MPa
	100.0 °C	220 - 235 MPa
	150.0 °C	205 - 220 MPa
	200.0 °C	190 - 205 MPa
	250.0 °C	185 - 200 MPa
	300.0 °C	180 - 195 MPa
	350.0 °C	175 - 190 MPa
	400.0 °C	170 - 185 MPa
	450.0 °C	165 - 180 MPa
Yield strength Rp1.0, transverse	20.0 °C	250 - 265 MPa

Thermal

Property	Temperature	Value	Comment
Coefficient of thermal expansion	100.0 °C	1.41E-5 1/K
	200.0 °C	1.49E-5 1/K
	300.0 °C	1.52E-5 1/K
	400.0 °C	1.56E-5 1/K
	500.0 °C	1.58E-5 1/K
	600.0 °C	1.6E-5 1/K
	700.0 °C	1.67E-5 1/K
	800.0 °C	1.72E-5 1/K
	900.0 °C	1.76E-5 1/K
	1000.0 °C	1.79E-5 1/K
Max service temperature, long		-10 - 450 °C
Melting point		1200 - 1480 °C	Typical for Nickel Chromium Iron Alloy
Specific heat capacity	20.0 °C	440 J/(kg·K)
	100.0 °C	462 J/(kg·K)
	200.0 °C	488 J/(kg·K)
	300.0 °C	514 J/(kg·K)
	400.0 °C	540 J/(kg·K)
	500.0 °C	565 J/(kg·K)
	600.0 °C	590 J/(kg·K)
	700.0 °C	615 J/(kg·K)
	800.0 °C	655 J/(kg·K)
	900.0 °C	680 J/(kg·K)
	1000.0 °C	710 J/(kg·K)
Thermal conductivity	20.0 °C	10.8 W/(m·K)
	100.0 °C	12.4 W/(m·K)
	200.0 °C	14.1 W/(m·K)
	300.0 °C	15.6 W/(m·K)
	400.0 °C	16.9 W/(m·K)
	500.0 °C	18.3 W/(m·K)
	600.0 °C	19.6 W/(m·K)
	700.0 °C	21 W/(m·K)
	800.0 °C	23.2 W/(m·K)
	900.0 °C	25.7 W/(m·K)
	1000.0 °C	28.1 W/(m·K)

Electrical

Property	Temperature	Value
Electrical resistivity	20.0 °C	1.12E-6 Ω·m
	100.0 °C	1.14E-6 Ω·m
	200.0 °C	1.18E-6 Ω·m
	300.0 °C	1.2E-6 Ω·m
	400.0 °C	1.24E-6 Ω·m
	500.0 °C	1.26E-6 Ω·m
	600.0 °C	1.26E-6 Ω·m
	700.0 °C	1.27E-6 Ω·m
	800.0 °C	1.28E-6 Ω·m
	900.0 °C	1.29E-6 Ω·m
	1000.0 °C	1.3E-6 Ω·m

Chemical properties

Property	Value
Aluminium	0.2 %
Carbon	0.025 %
Chromium	19.5 - 23.5 %
Cobalt	1 %
Copper	1.5 - 3 %
Iron	20.04 %
Manganese	1 %
Molybdenum	2.5 - 3.5 %
Nickel	38 - 46 %
Phosphorus	0.02 %
Silicon	0.5 %
Sulfur	0.01 - 0.015 %
Titanium	0.6 - 1.2 %