S17400、17-4PH、W.Nr.1.4542、A564

17-4PH (0Cr17Ni4Cu4Nb, 630, S17400) precipitation hardening stainless steel

17-4PH precipitation hardening stainless steel is a precipitation, hardening, martensitic stainless steel composed of copper, niobium / rhenium. This grade has properties such as high strength, hardness (up to 300º C / 572º F), and corrosion resistance. After heat treatment, the mechanical properties of the product are more perfect, and it can reach compressive strength of up to 1100-1300 mpa (160-190 ksi). It cannot be used above 300º C (572º F) or very low temperature. It has good corrosion resistance to the atmosphere and diluted acids or salts. Its corrosion resistance is the same as 304 and 430.

The corrosion resistance of 17-4PH precipitation hardening steel is better than any other standard hardenable stainless steel. In most cases, its corrosion resistance is no less than 304. If there is a risk of stress corrosion cracking, the higher maturation temperature must be higher than 550ºC (1022ºF), preferably 590ºC (1094ºF), and the optimal tempering temperature in chloride media is 550ºC-1022ºF. This alloy is susceptible to erosion or crack corrosion in static seawater. It has the same corrosion resistance in the petrochemical, food processing, and paper industries as the 304L grade.

 

17-4PH (0Cr17Ni4Cu4Nb, 630, S17400) precipitation hardening stainless steel chemical composition:

C≤	Si≤	Mn≤	P≤	S≤	Ni	Cr	Cu	Nb+Ta
0.07	1.00	1.00	0.04	0.030	3.00 5.00	15.50 17.50	3.00 5.00	0.15 0.45

 

17-4PH (0Cr17Ni4Cu4Nb, 630, S17400) precipitation hardening stainless steel mechanical properties:

Density: 7.78kg / m3

Melting point: 1400 ～ 1440 ℃

Specific heat capacity: 502J / (kg · ℃).

 

17-4PH (0Cr17Ni4Cu4Nb, 630, S17400) precipitation hardening stainless steel mechanical properties:

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

2. Conditional yield strength σ0.2 (MPa): aging at 480 ℃ ≥1180, aging at 550 ℃ ≥1000, aging at 580≥865, aging at 620 ℃ ≥725.

3. Elongation δ5 (%): aging at 480 ℃ ≥10, aging at 550 ℃ ≥12, aging at 580 ℃ ≥13, aging at 620 ℃ ≥16.

4. Section shrinkage ψ (%): aging at 480 ° C ≥ 40, aging at 550 ° C ≥ 45, aging at 580 ° C ≥ 45, and aging at 620 ° C ≥ 50.

5. Hardness: solid solution ≤363HB and ≤38HRC, aging at 480 ° C ≥375HB and ≥40HRC, 550 ° C aging ≥331HB and ≥35HRC, 580 ° C aging ≥302HB and ≥31HRC, 620 aging ≥277HB and ≥28HRC.

 

17-4PH (0Cr17Ni4Cu4Nb, 630, S17400) precipitation hardening stainless steel application areas:

Widely used in oil field valve parts, chemical processing equipment, aircraft joints, fasteners, pump shafts, nuclear reactor parts, gears, paper mill equipment, missile joints, jet engine parts, etc.

 

17-4PH (0Cr17Ni4Cu4Nb, 630, S17400) heat treatment specification for precipitation hardening stainless steel:

1. Solid solution: 1020 ～ 1060 ℃, fast cooling.

2. Aging at 480 ° C. After solution treatment, air cooling at 470 ~ 490 ° C.

3. Aging at 550 ° C. After solution treatment, air cooling at 540 ~ 560 ° C.

4. Aging at 580 ° C. After solution treatment, air cooling at 570 to 590 ° C.

5. Aging at 620 ° C. After solution treatment, air cooling at 610 to 630 ° C.