17-4PH stainless steel
Name: precipitation hardening stainless steel
Standard: AISI, ASTM
Model :17-4PH (SUS630)
UNS Number: S17400
● 17-4PH features and applications:
17-4PH material for the U.S. grade is martensitic precipitation hardening stainless steel, equivalent to Chinese brands: 0Cr17Ni4Cu4Nb. 17-4PH precipitation hardening steel add copper species. 17-4PH for the manufacture of shafts, turbine parts.
● 17-4PH chemical composition ①:
Carbon C: ≤ 0.07
Manganese Mn: ≤ 1.00
Si Si: ≤ 1.00
Chromium Cr: 15.5 ~ 17.5
Ni-Ni ②: 3.0 ~ 5.0
Phosphorus P: ≤ 0.04
Sulfur S: ≤ 0.03
Copper Cu: 3.0 ~ 5.0
Nb + Ta Nb + Ta: 0.15 ~ 0.45
● 17-4PH 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 δ5 (%): 480 ℃ aging, ≥ 10; 550 ℃ aging, ≥ 12; 580 ℃ aging, ≥ 13; 620 ℃ aging, ≥ 16
Reduction of area 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
● 17-4PH heat treatment and microstructure specifications:
Heat treatment specifications: 1) solid solution 1020 ~ 1060 ℃ rapid cooling; 2) 480 ℃ aging, after solution treatment, 470 ~ 490 ℃ air-cooled; 3) 550 ℃ aging, after solution treatment, 540 ~ 560 ℃ air-cooled; 4) 580 ℃ aging, after solution treatment, 570 ~ 590 ℃ air-cooled; 5) 620 ℃ aging, after solution treatment, 610 ~ 630 ℃ air-cooled.
Microstructure: the organization is characterized by precipitation hardening.
● 17-4PH Delivery status: normal to heat treatment delivery, the treatment types specified in the contract; not indicated, according to the heat treatment state of delivery.
Note: ① single value unless otherwise stated herein, are the highest value; ② pipe technology for some time, some types of austenitic stainless steel containing nickel must be slightly higher than the values shown in the table; ③ free; ④ the highest amount of TA containing 0.10%; ⑤ the highest content of 0.75%; ⑥ the highest content of 0.70%
17-4PH alloy is a precipitation hardening martensitic stainless steel.
17-4PH alloy is copper, niobium / columbium form of precipitation hardening, martensitic stainless steel.
This class has a high strength, hardness (up to 300 ℃ / 572 ℉) and anti-corrosion properties.
After heat treatment, the mechanical properties of the product more complete, can reach up to 1100-1300 mpa (160-190 ksi) of compressive strength.
This class can not be used above 300 ℃ (572 ℉) or very low temperatures, dilute acid or its salt air and has good corrosion resistance, corrosion resistance and its 304 and 430 the same.
17-4PH application areas:
Offshore platforms, helicopter deck, and other platforms
Food Industry
Pulp and paper industry
Aerospace (turbine blades)
Mechanical components
Barrels of nuclear waste
