● Introduce: is Martensite deposition hardening stainless steel,Chinese Grade Is 0Cr17Ni4Cu4Nb。

● Dimensions:Dia8mm-Dia130mm

● Chemical composition：

C：≤0.07

Mn：≤1.00

Si：≤1.00Cr：15.5~17.5

Ni：3.0~5.0

P：≤0.04

S：≤0.03

Cu：3.0~5.0

Nb+Ta：0.15~0.45

● mechanical properties Tensile Strength:σb (MPa):

480℃ ageing≥1310; 

550℃ ageing≥1060; 

580℃ ageing ≥1000; 

620℃ ageing,≥930

● Offset yield strength:

σ0.2 (MPa)：480℃ ageing≥1180;550℃ ageing,≥1000;580℃ ageing≥865;

620℃ ageing,≥725

● Elongationδ5 (%)：

480℃ ageing≥10;550℃ ageing,≥12;580℃ ageing≥13;620℃ ageing≥16

● Reduction of area ψ (%)：

480℃ ageing,≥40;550℃ ageing,≥45;

580℃ ageing ≥45; 620℃ ageing,≥50

● Hardness： Solution,≤363HB和≤38HRC;

480℃: ageing≥375HB or ≥40HRC; 

550℃:ageing≥331HBor≥35HRC;

580℃ageing≥302HB or ≥31HRC;

620℃ageing,≥277HB or ≥28HRC

●Features and applications：17-4PH:Precipitate hardened steel type with copper。It is used in manufacturing shaft and turbine parts.