EN10216-2 1.6368 15NiCuMoNb5-6-4 Seamless Steel Tubes

Short Description:

15NiCuMoNb5-6-4 (diwa373, 15NiCuMoNb5, or WB36) is the material developed by mannesman company in Germany, which is used for nuclear power generating units and high parameter thermal power generating units.

Product Detail

Product Tags

EN10216-2 15nicumonb5-6-4 seamless steel Tubes

Standard: EN10216-2
15NiCuMoNb5-6-4 (
DIWA373, 15NiCuMoNb5, or WB36) is the material developed by mannesman company in Germany, which is used for nuclear power generating units and high parameter thermal power generating units. It is developed by adding Ni Cu Mo Nb alloy elements on the basis of carbon manganese steel. Because the alloy elements such as Ni, Cu, Mo and Nb are added to the steel, it has the effect of fine grain strengthening and precipitation strengthening, thus greatly improving the high temperature strength and permanent strength of the steel, and the addition of Cu does not reduce the permanent plasticity of the steel.
15NiCuMoNb5-6-4 steel is characterized by strength, yield limit is 40% higher than 20g steel, service temperature is 400 ℃, it can be used as high-pressure pipe with pipe wall temperature up to 500 ℃, or as high-temperature and high-pressure components of high parameter thermal power generating units, such as boiler drum, steam water separator, header, steam generator, steam pipe and nuclear power equipment.

15NiCuMoNb5-6-4 (WB36) high pressure boiler tubes are manufactured by seamless process.
15NiCuMoNb5-6-4 (WB36) High Pressure Boiler Tubes Quick Details
Type:Seamless Steel tubes
Technique: Hot rolled or cold drawn
Standard: EN 10216-2
Outside Diameter: 25mm-508mm
Wall thickness: 6mm-35mm
Length: 6000Mm, 12000m or specified length as required.
Type of End-Finish: Plain End, Beveled End, Treaded
Surface treatment: Tubes will be varnished (Outside only) to prevent rust.
Additional Info
Payment Terms:T/ T, LC
Port of Shipment: Tianjin, China
Package:According To Per Customers' Require
Marking: Standard + Steel Grade + Size + Heat No + Lot No
Delivery time: Tubes will be completed within 30 days, and urgent delivery time can be discussed.

Chemical composition

Grade C Mn Si P S Cr
15NiCuMoNb5-6-4 0.17 0.8-1.2 0.25-0.50 ≤0.03 ≤0.025 ≤0.30
Cu Mo Ni Nb N 
0.5-0.8 0.25-0.50 1.00-1.30 0.015-0.045 ≤0.02 

Mechanical properties

Grade Yield Strength/MPa Tensile Strength/Mpa Elongation/% Hardness/HB Impact work longitudinal/J Microstructure
20℃ 0℃ -20℃
15NiCuMoNb5-6-4 ≥440 610-780 ≥19 ≤252 ≥95 ≥80 ≥60 F+B+P


Durable strength σ, 15NiCuMoNb5-6-4 (WB36) high pressure boiler tube

Grade 400℃ 420℃ 440℃ 460℃ 480℃ 490℃ 500℃
15NiCuMoNb5-6-4 373 325 273 210 139 104 69

Heat treatment

Normalizing or quenching Temper Stress relief heat treatment
900-980 ° C air cooling 580-640 ° C air cooling 550-600 ° C air cooling
880-930 ° C oil or water cooling 620-700 ° C air cooling
Metallographic structure
The supply state of 15nicumonb5-6-4 seamless steel tube (diwa373, WB36) steel is normalizing (quenching) + tempering. After the final heat treatment of normalizing and tempering, the microstructure is bainite + ferrite + sorbite or bainite + a small amount of ferrite.
Welding material
15nicumonb5-6-4 steel tubes have good welding performance. Manual welding rod l-80 (aws-e11016g), tungsten argon arc welding wire smh-80 (aws-e110s) or corresponding domestic welding materials. In order to avoid welding cracks, preheating (temperature 150-200 ℃) shall be carried out before welding. Stress relief treatment shall be carried out after welding.
The W36 made in China has good weldability and high cold crack sensitivity, but it can prevent cold crack by preheating at 150 ℃, and it is not sensitive to reheat crack. Manual arc welding with welding rod che607ni backing h10mn2nimoa / h08mn2moa welding wire and sj101 flux submerged arc welding are used for automatic full welding. After 530-600 ℃ post weld heat treatment, it has good performance and can meet the manufacturing requirements.

Mark of 15NiCuMoNb5-6-4 Seamless Steel Tubes

Specification photo 
of 15NiCuMoNb5-6-4 Seamless Steel Tubes


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