17-4PH Precipitation Hardening Steel Bar

 

17-4PH alloy is composed of copper, niobium precipitation, hardening, martensitic stainless steel. After heat treatment, the mechanical properties of the product are improved and compressive strength up to 1100-1300 MPa (160-190 ksi) can be achieved. This grade can not be used at temperatures above 300 ° C (572 ° F) or very low temperatures. It has good corrosion resistance to atmospheric and dilute acids or salts, and its corrosion resistance is the same as 304 and 430.

 

17-4PH is a martensitic precipitation hardened stainless steel .17-4PH performance characteristics is easy to adjust the strength level, you can change the heat treatment process to be adjusted.Martensite transformation and aging treatment to form a precipitation hardening phase is the main means of strengthening, 17-4PH attenuation performance, anti-corrosion fatigue and anti-drop performance.

 

Application areas

 

Offshore platforms, helicopter decks, other platforms food industry

Pulp and paper industry

· Aerospace (turbine blades)

· Mechanical components

Nuclear waste bin

17-4PH 17-4PH alloy is precipitated, hardened, martensitic stainless steel.

17-4PH alloy is composed of copper, niobium precipitation, hardening, martensitic stainless steel.

This grade has high strength, hardness (up to 300 C C / 572 ㎡ F) and corrosion resistance and other characteristics.

After heat treatment, the mechanical properties of the product are further improved and compressive strength up to 1100-1300 mpa (160-190 ksi) can be achieved.

This grade can not be used at temperatures above 300 ° C (572 ° F) or very low temperatures. It has good corrosion resistance to atmospheric and dilute acids or salts. Its corrosion resistance is the same as that of 304 and 430.

 

Chemical Composition: 

 

C: ≤0.07

Si: ≤1.00

Mn: ≤1.00

P: ≤0.040

S: ≤0.030

Ni: 3.00-5.00

Cr: 15.0-17.5

Mo: -

Cu: 3.00-5.00

Nb: 0.15-0.45

other:-

 

 

Mechanical properties:

 

Tensile strength σb (MPa): 480 ℃ aging, ≥ 1310; 550 ℃ aging, ≥ 1060; 580 ℃ aging, ≥ 1000; 620 ℃ aging, ≥ 930

Conditions Yield strength σ0.2 (MPa): 480 ℃ aging, ≥1180; 550 ℃ aging, ≥1000; 580 ℃ aging, ≥865; 620 ℃ aging, ≥725

Elongation rate δ5 (%): 480 ℃ aging, ≥10; 550 ℃ aging, ≥12; 580 ℃ aging, ≥13; 620 ℃ aging, ≥16

Sectional shrinkage ψ (%): 480 ℃ aging, ≥40; 550 ℃ aging, ≥45; 580 ℃ aging, ≥45; 620 ℃ aging, ≥50

Hardness: solid solution ≤ 363HB and ≤ 38HRC; 480 ℃ aging, ≥ 375HB and ≥ 40HRC; 550 ℃ aging, ≥ 331HB and ≥ 35HRC; 580 ℃ aging, ≥ 302HB and ≥ 31HRC; 620 ℃ aging, ≥ 277HB and ≥ 28HRC

Density: 7.80g / cm3

 

Heat treatment specification:

 

  1. 1020 ~ 1060 ℃ solid solution fast cooling
  2. 480 ℃ aging, after solution treatment, 470 ~ 490 ℃ air cooling
  3. 550 ℃ aging, after solution treatment, 540 ~ 560 ℃ air cooling
  4. 580 ℃ aging, after solution treatment, 570 ~ 590 ℃ air cooling
  5. 620 ℃ aging, after solution treatment, 610 ~ 630 ℃ air cooling

 

Metallography:

 

The tissue is characterized by precipitation hardening.