In this paper

the effects of alloy elements Cu

Sb

Sn

Mo and W of new national standard 09CrCuSb on their microstructure and mechanical properties are studied by means of metallographic microscope

scanning electron microscope

EPMA

tensile mechanical property test and Charpy impact test. The results show that the addition of alloying elements will promote the precipitation of δ-ferrite to increase the strength of the material but reduce its plasticity;δ-ferrite will significantly reduce the impact mechanical properties of the material

making the impact fracture change from plastic fracture to brittle fracture

especially for the impact energy at -40 ℃[Among them

R

p0.2

=365.64 MPa

Charpy impact energies K

V2

243 J(ambient)and 192 J(-40℃)

]

.Under the framework of the new national standard composition

it is necessary to adjust the reasonable hot working process to reduce the precipitation of δ-ferrite and improve the mechanical properties of the material.