Introduction of 25CrMo4 steel plate for German high temperature pressure vessel

Introduction of 25CrMo4 steel plate for German high temperature pressure vessel

25CrMo4 alloy structural steel is a German high-temperature pressure vessel steel. Material No. 1.7218, according to German standard: EN10083.3-2006. Corresponding to China's grade 20CrMo, Japan's grade SCM420SCM22). It has high hardenability, no tempering brittleness, weldability, quite good, little tendency to form cold cracking, good machinability and cold strain composition. It is used in a quenched and tempered or carburized quenching state. It is mainly used for the manufacture of high-pressure pipes and various fasteners working in non-corrosive media and media with a working temperature of less than 250 °C and containing nitrogen and hydrogen mixtures, such as gears, shafts, etc.
 

Chemical composition

Tabulation: Depu Steel Date: 2024-01-22

C	Si	Mn	S	P	Cr	Ni	Cu	Mo
0.22-0.29	0.10-0.40	0.60-0.90	≤0.035	≤0.035	0.90~1.20	≤0.030	≤0.10	0.15-0.30

Note:
(1): In order to improve the properties of steel, the number of other trace alloying elements other than the above table can be added; It comes from the Internet and is for reference only.
(2): The allowable deviation of the chemical composition of the finished steel plate shall comply with the provisions of
GB/T222 25CrMo4 alloy structural steel mechanical properties: tensile strength σb (MPa): ≥885 (90) yield strength σs (MPa): ≥685 (70)

elongation δ5 (%):
≥12
Section shrinkage ψ (%): ≥50 impact energy Akv (J): ≥35 impact toughness value αkv (J/cm2): ≥98 (10
)
Hardness: ≤212HB
Specimen size: The sample blank size is 15mm
25CrMo4
alloy structural steel heat treatment specification and metallographic structure
Heat treatment specification: quenching 880°C, water-cooled, oil-cooled; Tempered at 500°C, water-cooled, oil-cooled.
25CrMo4 alloy structural steel: delivered in heat-treated (normalized, annealed or high-temperature tempered) or non-heat-treated condition, the delivery status should be indicated in the contract.